As 100 ml of 0.16 m naf and 100 ml of 0.16 m hf are combined, the resulting solution's pH rises when compared to the 0.10 m hf solution.
What does pH stand for?a metric for determining how basic or acidic a thing or solution is. The pH scale ranges from 0 to 14. A pH value of 7 is considered neutral on this scale, meaning it is neither acid nor basic. It's more acidic if the pH value is below 7, and more basic if the pH value is above 7.
What is a typical pH value?The pH scale goes from 0 (very acidic) to 14 (neutral) (strongly basic or alkaline). The neutral range on this scale has a pH of 7.0. Blood typically has a pH range of 7.35 to 7.45, making it mildly basic.
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What does bromine and oxygen make?.
select all the statements that describe the reaction of water with an alkyne in the presence of an acid catalyst. multiple select question. the enol form of the product is more stable than the keto form.
Statements that describe the reaction of water with an alkyne in the presence of an acid catalyst include :
* The ketone form of the product is more stable than the enol form.
* The initial product of the reaction is an enol.
* The enol tautomerizes to form a ketone.
* HgSO4 is used as an additional catalyst in this reaction.
A catalyst is a substance that accelerates a chemical response or lowers the temperature or pressure needed to begin one, without itself being consumed in the course of the reaction.
Catalysts speed up a chemical reaction by means of reducing the amount of power you need to get one going. Catalysis is the backbone of many business tactics, which use chemical reactions to turn raw materials into beneficial products.
Catalysts may be labeled as homogeneous, heterogeneous, or enzymatic. Homogeneous catalysts exist within the identical phase because of the reactants, whereas heterogeneous catalysts exist in a specific phase than the reactants.
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at the end of an experiment you notice a small amount of activated charcoal in your final product. how will this impact the mp of the compound
Small mount of activated charcoal in final product does not affect the melting point of the compound because some compound has high impurity weight.
The activated charcoal can remove impurities in the gaseous and iquid state from many solutions. By the process of adsorption the activated charcoal attracts these molecules to the surface of the charcoal. A small amount of impurities left from the charcoal used in some step. It does not affect the melting point of the compound because some compound has high impurity weight.
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agno3(aq)agno3(aq) and nacl(aq)nacl(aq) express your answer as a chemical equation. identify all of the phases in your answer. enter noreaction if no precipitate is formed.
The reaction between AgNO₃ and NaCl forms AgCl and NaNO₃. The balanced chemical equation for the above reaction is given as:
AgNO₃ (aq) + NaCl (aq) → AgCl (s) + NaNO₃ (aq)
The reaction between AgNO₃ and NaCl is both precipitation and double-displacement reaction. The balanced chemical equation is given as:
AgNO₃ (aq) + NaCl (aq) → AgCl (s) + NaNO₃ (aq)
(ppt)
In a double displacement reaction the anions are exchanged and the more reactive element displaces the less reactive element. And in a precipitation reaction, a precipitate is formed in the end of the reaction. In this reaction, AgCl is formed as precipitate.
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How long should the food worker label chicken salad?.
the food worker label chicken salad as three days old according to the example given below.
In this case, the food worker should label the food as three days old. This is because food in the food industry must be labelled with the date of the oldest cooked ingredient. It would be the chicken in this case. When foods are unfrozen or cooked, microorganisms begin to grow on the surface and enzyme activity increases. This accelerates the rate at which the food spoils. According to the CDC, chicken is safe to eat up to four days after it has been cooked.
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2 c2h2(g) 5 o2(g) -----> 4 co2(g) 2 h2o(g) if you have 3.40 moles of acetylene (c2h2) for a complete reaction, how many moles of o2 are needed:
The 0.16 moles of o2 are needed for to complete this reaction.
What is mole?
The term "mole" refers to the volume of a system that includes as many elementary particles as there are atoms in 0.012 kilograms of carbon 12.
What is acetylene?
The simplest alkyne chemical, often known as acetylene. Ethyne, narceine, and vinylene are other names for acetylene. It is widely utilised as a fuel and a component of chemical compounds. It is treated as a solution even though it is unstable in its pure state.
2C2H2(g)+5O2(g)→4CO2(g)+2H2O(g)
A) 2 moles C2H2 require 5 moles O2
3.0 moles C2H2 require 3.0 x 5 / 2 = 7.5 moles O2
moles of O2 required = 7.5
B) 2 moles C2H2 produce 4 moles CO2
3.2 moles CH2 produce 3.2 x 4 / 2 = 6.4
moles of CO2 produced = 6.4
C) 2 moles H2O require 2 moles C2H2
0.58 moles H2O require 0.58 x 2 / 2 = 0.58 moles C2H2
moles C2H2 require = 0.58
D) 5 moles O2 produce 4 moles CO2
0.20 moles O2 produce 0.20 x 4 / 5 = 0.16
moles CO2 produced = 0.16
Therefore, 0.16 moles of o2 are needed for to complete this reaction.
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which of the following statements correctly describe resonance structures? select all that apply.
Molecules that require more than one inwis structure to accurately describe them.
The actual molecule is an average of the Lewis structure.
Moleculos that change back and forth between several different forms Molecules that spin so that double bends paint in ditferent dircctions
Molecules that react with other molecuies and form a hybrid
The statements correctly describe resonance structures is The actual molecule is an average of the Lewis structure. Therefore, option B is correct.
What is Lewis structure ?The representations known as Lewis structures, often referred to as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures, depict the interactions between the atoms in a molecule as well as any lone pairs of electrons that may be present.
The electronic bonding of a single polyatomic species, including fractional bonds and fractional charges, is described by resonance structures, which are a collection of two or more Lewis structures.
In comparison to separate resonance structures, the resonance hybrid is more stable. The movement of a charge between two or more atoms is frequently represented by resonance structures. These atoms have a more evenly distributed charge, which makes it more stable.
Thus, option B is correct.
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Enter a balanced chemical equation for the reaction of aqueous potassium hydroxide with aqueous copper(II) chloride to form solid copper(II) hydroxide and aqueous potassium chloride.
Express your answer as a chemical equation. Identify all of the phases in your answer.
CuCl₂₍aq₎ + 2KOH₍aq₎ ⇒ Cu(OH)₂₍s₎ + 2 KCl₍aq₎
Above reaction is an example of precipitation reaction, in which Cu(OH)₂ is the formed precipitate.
What is precipitation reaction?In aqueous solution, precipitation is the process of transforming a dissolved substance into an insoluble solid from a super-saturated solution. The solid formed is the precipitate.
Precipitation reactions are usually double displacement reactions involving the productions of a solid form residue. Precipitate is formed when cations and anions in aqueous solution combine.
What are the reactants used?CuCl₂ : Its appearance is yellow-brown solid
KOH : Potassium hydroxide, its appearance is white solid deliquescent, etc,.
What are the products formed?Cu (OH)₂ : Its appearance is blue or blue-green solid
KCl : potassium chloride and sylvite , its appearance is white crystalline solid and colorless hygroscopic crystals.
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an increased anion gap would be consistent with which of the following? the body has a net neutral charge, but the anions we measure have been replaced by anions other than cl- and hco3-. the body has a net neutral charge, but the cations we measure have been replaced by cations other than na and k . there are now more anionic equivalents than cationic equivalents, and the body has a net negative charge. there are now more cationic equivalents than anionic equivalents, and the body has a net positive charge.
Usually, an increased or normal anion gap metabolic acidosis results from too much acid and/or too little base.
Which of the following conditions will result in a larger anion gap?In patients with acidosis, lactic acidosis, diabetic ketoacidosis, uremic acidosis, ethylene glycol poisoning, and laboratory mistake are the most frequent causes of an elevated anion gap.
What exactly does having a high anion gap mean?The anion gap quantifies the space between your blood's positively and negatively charged electrolytes. Your blood is more acidic than usual if the anion gap is too high. If the anion gap is too small, your blood's acidity is insufficient.
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using the vsepr model, the electron-domain geometry of the central atom in clo3- is . question 34 options: a) linear b) trigonal planar c) tetrahedral d) trigonal bipyramidal e) octahedral
The VSEPR theory states that the ClO3 ion's pyramidal geometry results from the presence of one lone pair and three bond pairs, which cause sp3 hybridization.
What is VSPER Theory?
From the electron pairs that surround the core atoms of the molecule, the VSEPR theory is utilised to predict the shape of the molecules. Sidgwick and Powell initially introduced the theory in 1940. The VSEPR theory is predicated on the idea that the molecule will adopt a form that minimises electronic repulsion in that atom's valence shell.
The VSEPR hypothesis, also known as the "Valence Shell Electron Pair Repulsion Theory," is based on the idea that all atoms have a repulsion between their pairs of valence electrons,
The valence shell electron pair repulsion (VSEPR) theory is a model that predicts the 3-D form of molecules based on the amount of valence shell electron bond pairs that exist between the atoms in a molecule or ion. This theory predicts that electron couples will arrange themselves to minimise the effects of their mutual repulsion. The electron pairs are, to put it another way, as far apart as they can be.
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The four naturally occurring isotopes of sulfur are sulfur-32 sulfur-33 and sulfur-34.
Fourth naturally occurring isotope of sulfur is sulfur-36. The average atomic mass of Sulfur is 32.066 amu.
Natural abundance of isotopes of sulfur is:
sulfur-32 is 95.0%
sulfur-33 is 0.76%,
sulfur-34 is 3.22%
sulfur-36 is 0.89%
The average atomic mass of an element is defined as the total of atomic mass of an isotope multiplied by its natural abundance. Atomic mass of sulfur can be found as
Average Atomic Mass = (Atomic mass of S-32 * Abundance of S-32) + (Atomic mass of S-33 * Abundance of S-33) + (Atomic mass of S-34 * Abundance of S-34) + (Atomic mass of S-36 * Abundance of S-36)
Average Atomic Mass = (32amu × 0.95) +(33amu × 0.0076) + (34amu × 0.0322) +(36amu × 0.0089)
Average Atomic Mass = (30.4amu) + (0.2508amu) + (1.0948amu) + (0.3204amu)
Average Atomic Mass = 32.066 amu
Your question is incomplete but most probably your full question was;
Sulfur has 4 isotopes: sulfur-32 is 95.0%, sulfur-33 is 0.76%, sulfur-34 is 3.22%, and sulfur-36 is 0.89% abundant. calculate its average atomic mass. express your answer with five sig figs.
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What are the 5 steps to prevent a fire?.
The 5 steps to prevent a fire are
Unplug any devices you aren't using:Check the Smoke Alarms.Lawn clippings and other flammable items should be kept in secure locations.Pets should be kept indoors.Examine the wiring and appliances in your home.These are actions and procedures designed to prevent and put out destructive fires. Anywhere a fire can start, so it's critical to always be prepared for what to do if one breaks out inside your house. Likewise, it's equally crucial to consider all of the ways in which you can stop one from occurring in the first place.
Hence, simple step of fire prevention works on minor levels.
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What energy is used in melting?.
Answer:
The energy used in melting is heat energy.
If a mutation has a visible effect at 26°c, but no visible effect at 20°c, then 20°c is the _______ temperature and 26°c is the _______ temperature.
The permissive temperature is 20°C, and the restrictive temperature is 26°C if a mutation has an obvious effect at 26°C but not at 20°C.
What do permitted and restricted temperatures mean in terms of mutation?A mutation that, under some (permissive) environmental conditions, exhibits the wild-type phenotype and, under other (restrictive) conditions, exhibits the mutant phenotype.Permissive temperature : This causes the cell or organism to survive, just as it would if it were a wild type strain.The temperature at which the mutant phenotype is seen, in contrast, is the nonpermissive temperature or restrictive temperature.Restrictive temperature : A temperature below which a heat-sensitive cell LINE cannot operate.The physiological or behavioral reaction of an organism to varying thermal circumstances is known as temperature sensitivity.A low degree of temperature sensitivity denotes that the response is minimal.A high degree of temperature sensitivity says that a minor change in temperature results in a significant response.When a gene is expressed above a specific temperature, temperature-sensitive mutants of the gene exhibit a substantial decrease in the quantity or activity of the gene product (nonpermissive temperature).To learn more about Mutation refer to:
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xwhich substance is a colloid? multiple choice mayonnaise iced tea milk of magnesia gasoline italian salad dressing
When two or more substances are mixed together but not chemically combined, the result is a colloid ( they can be separated ).
What is a colloid ?They are a unique kind of mixture in which minuscule amounts of one component are dispersed throughout another. Due to the fact that cream is made up of minute fat particles suspended in water, it is a colloid.A colloid is made up of smaller particles than a suspension.When cream is shaken vigorously for 10 minutes, the fat molecules bind together to form butter and buttermilk. Due to the water molecules that are entrapped between the fat molecules in butter, it is also a colloid.Butter and buttermilk are created when cream is separated.Examples of Colloids Milk, CreamThe proteins in the egg yolk stabilize the oil and water mixture that makes mayonnaise. This particular colloid is an emulsion.A colloid is a mixture made up of two or more substances that have been mingled but not chemically combined.Blood : An emulsion is a specific kind of colloid made up of a mixture of two liquids that creates a stable substance with different physical properties from the two individual liquids.Colloids can be composed of solid-liquid, solid-gas, liquid-liquid, gas-liquid, or gas-liquid combinations.To Learn more About colloid refer to:
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What would be the limiting reactant in the reaction if 1 mole of oxygen gas and 1 mole of ethanol.
The reaction between 1 mole of oxygen gas and 1 mole of ethanol has oxygen gas (O2) as the limiting reactant.
equilibrium equation
2CO2 + 3H2O > CH3CH2OH + 3O2
Three moles of oxygen (O2) and one mole of CH3CH2OH (from the previous equation) interacted.
Three moles of O2 and one mole of CH3CH2OH reacted from the above balanced equation.
As a result, 1 mole of O2 will react with 0.33 moles of CH3CH2OH (1/3)
From the preceding calculation, we can see that just 0.33 moles of the given 1 mole of CH3CH2OH are required for a complete reaction with 1 mole of O2.
O2 is the limiting reactant as a result.
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The complete question is
CH3CH2OH + 302 → 2002 + 3H20
What would be the limiting reactant in the reaction if 1 mole of
oxygen gas and 1 mole of ethanol (CH3CH2OH) reacted with
each other?
Draw the line-angle formula for the ester formed from one molecule of terephthalic acid and one molecule of ethylene glycol.
Ethylene glycol and terephthalic acid undergo condensation polymerisation with the elimination of water (H20) molecule. Elimination of water forms ester bond between these two molecule.
Dacron or terylene is a type of polyester. Which is formed by the condensation polymerization. Ethylene glycol and terephthalic acid undergo condensation polymerisation with the elimination of water (H20) molecule. Elimination of water forms ester bond between these two molecule.
Since, terephthalic acid contains -COOH (acidic group) and ethylene glycol contains -OH (alcoholic group).
The reaction takes place at a temperature range of 420 - 460 K. This reaction occur in presence of zinc acetate and antimony trioxide as a catalyst.
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europium-151 has an abundance of 48.03% and europium-153 has an abundance of 51.97%. what is the average atomic mass of europium?
The average atomic mass of Europium is 152.04u where europium 151 has abundance of 48.03% and europium 153 has abundance of 51.97% .
There are two isotopes of naturally occurring europium(Eu).These are europium 151 and europium 153.Europium 151 is more stable isitope among the isotopes. Europium-151 has an abundance of 48.03% and Europium-153 has an abundance of 51.97%.We can calculate the abundance by calculating average atomic mass using atomic mass of each isotopes and their percentage abundance dividing each percentage abundance by 100 to convert in a decimal form .then multiply the value by atomic mass of the isotopes.
Atomic Mass of Europium-151 is 151u.
The percentage abundance of Europium-151 = 48.03%
The fractional abundance of Europium-151 = 0.4803.
Mass of Europium-153 is 153 u.
The percentage abundance of Europium-153 = 51.97%
The fractional abundance of Europium-153 = 0.5197
The atomic mass of Europium= Mass of isotope . Fractional abundance of isotopes
so putting the values we get,
Average Atomic mass of europium = (151u . 0.4803) + (153u . 0.5197)
= 152.04u
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Europium-151 has an abundance of 48.03% and europium-153 has an abundance of 51.97% the average atomic mass of europium is 200.
Assume which you have ten thousand atoms of Eu.Then you've got got 4803 atoms of 63151 Eu and 5197 atoms of 63153 Eu.Mass of 63151 Eu=4803×151u=725 253 uMass of 63153 Eu=5197×153u=795 141 uMass of ten thousand toms =1 520 394 u.Average mass = 100001520394u =152 u.Method 263151 Eu:48.03%×151 u=72.5353 u63153 Eu:51.97%×153 u=79.5141 uTotal="152.0394 u"=152 u.Note: In each methods, the solution for hundreds of the 2 isotopes.
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What are some examples of chemical exposure?.
Water exposure can happen when someone drinks polluted subsoil and surface water, or ingests it unintentionally while swimming or taking a shower.
How long do contaminants stay within the body?After exposure, some substances quickly leave the body. Others might persist for a long period in fats, blood, or bones. For instance, if a person has been exposed to arsenic just once, it typically only persists inside the body for 3 days. Other substances, like the insecticide DDT, can linger inside the body for up to 50 years.
What causes exposure to chemicals?Exposed: A chemical can only harm your health if it comes into touch with or enters your body. Exposure routes: A chemical can be exposed through eating, inhalation, or direct contact.
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How do you check a radical equation?.
On one end of the equation, isolate any of the radical terms. Increase all sides of the equation by the index's power. Exist any new radicals? In that case, resolve the new equation.
What is a radical instance?, is a prominent illustration of a radical. Three-electron molecules like triplet oxygen and triplet carbene (CH. 2) are two more examples. There are numerous techniques to produce radicals, but most commonly, redox processes are used.
What constitutes radical beliefs?Radical politics refers to the desire to modify or supplant the core values and standards or political system, frequently through social transformation, structural change, revolution, or radical reform. Radicalization is the process of embracing extreme viewpoints.
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it takes 238 kj/mol to break a carbon-iodine single bond. calculate the maximum wavelength of light for which a carbon-iodine single bond could be broken by absorbing a single photon.
The maximum wavelength of light for which a carbon iodine single bond could be broken by absorbing a single photon is 503 nm
Energy per mole EA = NA . he/ λ
= λ= NaHe/EA
= (6-023 x 1023 mol-1) x (60626 x 10-3495) x (378108 ms-1)/(238 x 103 J mol-1)
= 0.503x10-6 m
= 503x10-9m
= 503 nm
[ λ= wavelength ]
[ NA= Avagrado's Number ]
The wavelengths of the visible mild range between 400-700 nanometers, that is among the infrared having longer wavelengths and the ultraviolet having shorter wavelengths. The wavelength of the visible mild suggests that its frequency is about 430-750 terahertz (THz).
The wavelength of light is the space between corresponding factors in two adjoining mild cycles, and the frequency of mild is the quantity of cycles of mild that skip a given factor in a single second.
A single wavelength is much less than 1.2 meters; it could be observed with the aid of dividing 1.2 meters by means of 1.5. The wavelength of the third harmonic is 0.8 meters.
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The mass of 13c is 13. 003 amu. Multiply the mass of 13c by its abundance. Report the number to 3 significant digits.
The product obtained by multiplying the atomic mass of carbon-13 by its abundance is 0.144
Isotopes is a term used in chemistry that can be described as members of a family of an element that have the same number of protons but differ in the number of neutrons
Carbon-13 is a stable carbon isotope whose nucleus consists of six protons and seven neutrons.
Since the mass of Carbon-13 is 13.003 amu and its abundance in nature is 1.109%, we can calculate the product of these as follows;
First, we convert the abundance percentage into a decimal value as follows;
1.109% = 1.109 ÷ 100 = 0.01109
Now;
mass × abundance = 13.003 × 0.01109
mass × abundance = 0.14420327
Now converting it to 3 significant digits;
mass × abundance = 0.144
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how many alkene products, including e,z isomers, might be obtained by dehydration of 3-methyl-3-hexanol with aqueous sulfuric acid?
Five alkene products, By dehydrating 3-methyl-3-hexanol, five alkene compounds are attainable.
What are alkenes' products?Alkenes can interact with various chemical kinds in addition reactions.
For instance:
hydrogen + propane = propane.For instance, butene + water yields butanol.An alkene may receive the addition of chlorine, bromine, or iodine. Usually, these responses are unplanned. ...Dichloroethane is created by adding chlorine to ethane.Iodine with ethene produce diiodoethane.Alkenes are a group of unsaturated hydrocarbons (i.e., molecules with solely carbon and hydrogen) that include at least one double bond from carbon to carbon. Olefins is a different name for alkenes. Due to the double bond, alkenes are more reactive than alkanes.
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Because electron delocalization stabilizes a compound, if the only way electrons can be moved is away from the most atom, that is better than no electron delocalization at all. Place appropriate curved arrows form the ones provided showing the direction of electron flow. More than one arrow can be used for one structure. Drag the appropriate arrows onto their respective targets. Targets may be left blank. The approximate structures, which can be depicted using curved arrows to show the movement of delocalized electrons, are called resonance contributors. Draw curved arrows to indicate how each resonance contributor leads to the next for the molecule shown. Edit the reaction by drawing electron flow arrows where needed. Electron flow arrows should start on an atom or a bond and should end on an atom, bond, or location where a new bond should be created.
Because electron delocalization stabilizes a compound, if the only way electrons can be moved is away from the most atom, that is better than no electron delocalization at all this is false.
The electron delocalization stabilizes the electron so it is necessary to have electron delocalization. the electron delocalize because it spreads the energy over the large area. the electrons present are the charges which brings the extras stability.
Thus, Because electron delocalization stabilizes a compound, if the only way electrons can be moved is away from the most atom, that is better than no electron delocalization at all this is false.
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How is sanitizer solution measured?.
sanitizer solution measured if it reads between 100 and 400 ppm, the concentration is adequate.
Sanitizers based on iodine: Dip the strip for 60 seconds in the sanitizing solution, then remove and compare to the colour chart. If it reads between 12.5 and 25 ppm, the concentration is adequate.The two most common field measurement methods are test strips and titration kits, but following manufacturer instructions and understanding the limitations of any method is critical when interpreting results. A test strip is used to determine the concentration of sanitizer in parts per million (ppm). Three of the test sections on the six-in-one test strip are related to sanitizer level. Total bromine, total chlorine.
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Why is there no liquid metallic hydrogen zone in the interiors of uranus or neptune?.
Two answers. Pressure and they're not big enough.
Now, you see, in order for hydrogen to be metallic, the interiors of Uranus and Neptune would have to have more pressure.
Pressure can be defined as the exertion of force upon a surface by an object, fluid, etc., in contact with it.
The three states of matter on Earth are solid, liquid, and gas. An element's shape is determined by its temperature and pressure. On Earth, hydrogen is generally a gas, but it may be intentionally cooled and compressed to change its state into a liquid or a solid. Hydrogen is still a non-metal even in these states; since its atoms strongly cling on to their electrons, it has poor electrical and thermal conductivity. Contrarily, metals have good electrical and thermal conductivity due to the arrangement of their atoms, which forms a lattice that makes it simple for the outermost electrons of one atom to go to another.
Jupiter and Saturn are the two gas giants in our solar system. Based on their densities, both planets have a considerable amount of hydrogen in them. However, the hydrogen in these giants is heated and compressed to such high temperatures and pressures that it assumes a number of peculiar phases, including liquid metallic hydrogen. Hydrogen, as I previously stated, is a non-metal. However, in Jupiter and Saturn, the extreme temperatures and pressures cause hydrogen atoms to lose their electrons, resulting in a stew of free-floating hydrogen nuclei (protons) and electrons. The ability of the electrons to travel freely between the nuclei due to their unbound state is a characteristic of metals. This is metallic hydrogen, which has a metallic-like behavior. Metallic hydrogen is conductive and is thought to play a significant role in the dynamo that drives the magnetic fields of Jupiter and Saturn. (However, the dynamo on Earth is propelled by liquid iron, a real metal.)
The ice giants of our solar system, Uranus and Neptune, are too dense for hydrogen to make up a significant portion of their composition. In addition, because of how similar their masses are, planetary scientists presume that the innards of these two planets are comparable and that hydrogen makes up just around 15% of their masses. Although hydrogen is thought to form a liquid molecular shell deeper into Uranus and Neptune and is present in their atmospheres, it never experiences the pressures and temperatures necessary to transform into metallic hydrogen.
Thanks.
these space-filling models represent molecules of elemental oxygen, fluorine, and nitrogen, respectively. looking at these models, answer the following questions.
Similar to the ball-and-stick model, this graphic or physical representation of a molecule shows the atoms as partial spheres with diameters proportional to the real atoms.
What does a space-filling model show?Because they display how much room an atom (or molecule) takes up, space-filling models are helpful. Comparing spatially models with conventional ball-and-stick models, such those in the following graphic, makes this point clear. The latter do not even remotely convey a feeling of molecular size.
How is the electron sharing represented in the spatially model of a molecule?The overlapping regions of the spheres in a room model represent the locations were chemical bonds are created in molecules whenever electrons are shared. In order to explain the relationships between the atoms within a molecule, scientists also employ ball-and-stick models.
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how many moles of kbr are present in 160. ml of a 0.130 m solution? express the amount in moles to three significant digits.
why is it necessary to indicate the state (s, i, g, aq) of products and reactants when writing a thermochemical equation?
In a thermochemical equation, the reactants' and products' physical states must be taken into account because they affect the value of H. In the course of an endothermic reaction, the environment provides energy.
What is Thermochemical Equations?The only difference between thermochemical equations and other balanced equations is that they also indicate the heat flow for the reaction. The equation's right side includes a list of the heat flow denoted by the letter H.Kilojoules, or kJ, are the most widely used units. Two thermochemical equations are provided here:H2 (g) + ½ O2 (g) → H2O (l); ΔH = -285.8 kJ
HgO (s) → Hg (l) + ½ O2 (g); ΔH = +90.7 kJ
The enthalpy of a substance depends upon temperature. Ideally, you should specify the temperature at which a reaction is carried out. When you look at a table of heats of formation, notice that the temperature of the ΔH is given. For homework problems, and unless otherwise specified, the temperature is assumed to be 25°C. In the real world, the temperature may be different and thermochemical calculations can be more difficult.A substance's enthalpy is temperature-dependent. The ideal situation would be to state the temperature at which a reaction occurs. Observe that the temperature of the H is mentioned in a table of formation temperatures. The temperature is assumed to be 25°C for homework problems unless otherwise stated. Calculations involving thermochemistry may be more challenging in the real world due to temperature variations.To Learn more about thermochemical equation refer to:
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which of the following is the correct mechanism for the sn2 reaction that occurs when chlorocyclohexane is treated with a cyanide ion?
Sn2 reaction is a reaction which is known to be nucleophilic. This reaction occurs step by step and is a type of substitution reaction.
In Sn2 reaction a lone pair from the nucleophile attacks on a place of electron deficiency.
This reaction follows a second order kinetics. It is single step reaction and both bond forming and breaking will occur at the same time.
The chlorocyclohexane is a single bonded hexane structure.
It has Cl on the ortho position.
Cyanide is a triple bonded structure, sharing a triple bond between the C and N. It also has 2 lone pairs and a negative charge on C.
When we react these two compounds then after the Sn2 reaction, we get a new structure called cyno-cyclohexane. In this reaction, the cyanide will attack at ortho place replacing Cl with CN and Cl will be released.
Therefore, in this Sn2 reaction, the new compound formed will be cyno-cyclo-hexane.
To learn more about reaction, refer: https://brainly.com/question/17434463
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