During lab, a student mixed 25 mL of 1.0 M H3PO4 with 75 mL of 1.0 M NaOH. Using the equation below, determine how many moles of reaction the student performed give your answer to 2 sigfigs. H3PO4 (aq) + 3 NaOH(aq) + Na3PO4 (aq) + 3 H20 (1) moles of reaction The intial temperature of both the acid and the base were 22.6 °C, but they rose to 28.2 °C during the reaction. If the calorimeter constant was 78.5J/°C, what was qrxn in J? Give your answer to 3 sigfigs, and watch your signs! Using your answers above, what was the reaction enthalpy, AHxn, in kJ per mol reaction? Give your answer to 2 sigfigs, and watch units! kJ/mol of reaction

At 300 k, the root-mean-square (rms) speed of a hydrogen molecule in a gas is equal to that of an oxygen molecule. the hydrogen molecule is 18.75 K in temperature.

Any molecule's root mean square velocity can be determined using the formula below:

μrms=√3RT/M

Since the RMS speed of two oxygen and hydrogen molecules is the same, equation (I) can be expressed as follows:

√3RT1/M1=√3RT2/M2

√T1/M1=√T2/M2

The molar mass. of oxygen molecule is 32.00 g/mol,

The molar mass. of hydrogen molecule. is 2.00 g/mol.

Substitute the known values in equation .

√300K/32.00g/mol=√T2/2.00g/mol

Squaring both the sides

T2=18.75k

The most basic molecule is a hydrogen molecule. Electrostatic forces hold together its two protons and two electrons, which are held together. Similar to atomic hydrogen, the assemblage can exist at various energies. The hydrogen atom H is one. One hydrogen molecule, H2, consists of two hydrogen atoms. Two hydrogen atoms make up the symbol 2H.

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Scientists think the Grand Canyon was formed when the Colorado River began to cut a channel through layers of rock.

The Grand Canyon is a one-kilometer-deep canyon in northern Arizona. Scientists estimate that the canyon may have formed 5 to 6 million years ago when the Colorado River began to channel itself through the rock formations. Humans have lived in the canyon and surrounding areas since the last Ice Age.

Paleozoic strata contain many fossils that help scientists learn more about the geological history of North America. Most of the fossils are sea creatures, which tells us that what is now central Arizona was once a sea. Here are some of the most common fossils found in the Grand Canyon. Canyons are formed by erosion. Over thousands of years, the flow of rivers erodes and erodes soil and rocks forming valleys.

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The following are correct ways of writing the reaction of an alkene with hydrobromic acid in the presence of a peroxide to form an alkyl halide :

CH₃CH = CH₂  +  HBr  + peroxide ----->    CH₃ - CH₂ - CH₂ -Br

Th alkene with hydrogen bromide in the presence of peroxide to form alkyl halide is knows as the anti - markovnikov's rule or called as peroxide effect. let us tale an example with propene, the reaction is given as :

CH₃CH = CH₂  +  HBr  + peroxide ----->    CH₃ - CH₂ - CH₂ -Br

Thus, The following are correct ways of writing the reaction of an alkene with hydrobromic acid in the presence of a peroxide to form an alkyl halide :

CH₃CH = CH₂  +  HBr  + peroxide ----->    CH₃ - CH₂ - CH₂ -Br

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Intermolecular forces are the forces that exist between molecules. These forces are responsible for the interactions between molecules, and they determine the physical and chemical properties of matter. Without intermolecular forces, matter would not exist as we know it.

Intermolecular forces are classified into four main types: dispersion forces, dipole-dipole forces, hydrogen bonding, and ion-dipole forces. Dispersion forces are the weakest of the four, but they are also the most common. Dispersion forces exist between all molecules, and they are responsible for the forces of attraction between molecules. Dipole-dipole forces are slightly stronger than dispersion forces, and they exist between molecules that have dipoles. Hydrogen bonding is the strongest of the intermolecular forces, and it exists between molecules that have hydrogen atoms bonded to nitrogen or oxygen atoms. Ion-dipole forces are the strongest of the intermolecular forces, and they exist between molecules that have an ionic charge.

Intermolecular forces are important because they determine the physical and chemical properties of matter. Without these forces, matter would not exist as we know it.

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Consumers provided proof of purchase in exchange for a rebate

Purchasing is the technique a commercial enterprise or organization makes use of to acquire items or offerings to accomplish its dreams. Although there are several agencies that try and set requirements for the shopping procedure, methods can range substantially among businesses.

Kind of purchases :

* Private Purchases.

* Mercantile purchasing.

* Business shopping.

* Institutionalized or authorities purchasing.

Purchasing is becoming a middle competency of the firm, locating and growing providers and bringing in expertise that is notably valued through the company. Buying is normally responsible for spending greater than 50 percent of all of the sales the firm receives as income from income.

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Answer: I think because their is metals on the left side of the peridoic table

Explanation:

Irony: a situation in which there is a contrast between expectation and reality.Irony can take many different forms.

The verbal irony, dramatic irony, and situational irony are the three types .Irony occurs in literature AND in life whenever a person says something or does something that departs from what they (or we) expect them to say or do.

Irony in the story 'Dusk':

Ironically, the main character, who thinks he is a good character judge, is duped by the young man who sat next to him on the park seat.

According to Gortsby, darkness is a time when dejected and shady people emerge.

The term irony has its roots in the Greek comic character Eiron, a clever underdog who by his wit repeatedly triumphs over the boastful character Alazon. The Socratic irony of the Platonic dialogues derives from this comic origin.

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From the stoichiometry of the reaction;

A) The mass of potassium iodide reacted is  17.26 g

B) The mass of sodium carbonate reacted is 13.78 g

C) The mass of the potassium sulfate reacted is 13.92 g.

We define a precipitation reaction as one in which there is a solid product that can be obtained after the mixing of two aqueous reactants. Hence, if we obtain a solid product after the reaction of two aqueous reactants, the solid product is called a precipitate.

Part A

Number of moles of lead II nitrate = 17.3 g/331 g/mol = 0.052 moles

If 2 moles of the potassium iodide reacts with 1 mole of  lead II nitrate

x moles of potassium iodide reacts with 0.052 moles of  lead II nitrate

x = 2 *  0.052 moles /1 mole

x = 0.104 moles

Mass of the potassium iodide =  0.104 moles * 166 g/mol

= 17.26 g

Part B

Number of moles of copper II chloride = 17.3 g /134 g/mol = 0.13 moles

Since 1 mole of sodium carbonate reacts with 1 mole of copper II chloride

x moles of sodium carbonate reacts with  0.13 moles of copper II chloride

x =   0.13 moles

Mass of sodium carbonate =   0.13 moles * 106 g/mol = 13.78 g

Part C

Number of moles of strontium nitrate = 17.3 g /212 g/mol = 0.08 moles

If the reaction is 1:1

Mass of potassium sulfate = 0.08 moles * 174 g/mol = 13.92 g

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Molar Mass of the Acid = 117.7gm

Number of milli moles of NaOH in 109.5 ml of 0.750 M solution = 109.5 x 0.750 =82.125

Since the acid is a diprotic acid 82.125 moles of NaOH will be neutralized by (82.125/2) = 41.06moles of the (Diprotic acid).

H2X + 2NaOH ===> Na2X + 2 H2O

Therefore 41.06 moles = 4.9 g

1000moles of the Diprotic acid = 4.9x (1000/41.06)

Molar Mass of the Acid = 117.7gm

A proton is a positively charged hydrogen atom, while an acid is a compound that releases a proton. Acids that are able to release more than a single proton are known as polyprotic acids. Let's take a moment to break down that term: The root '-prot-' is derived from the word 'proton,' and the prefix 'poly-' is Greek for 'many.' Thus, polyprotic acids have many protons.

One particular kind of polyprotic acid is diprotic acid. If we break down the term 'diprotic' the same as before, the prefix '-di' is Greek for 'two.' Thus, just as the prefix suggests, diprotic acids have two protons to donate. Sulfuric acid, hydrogen sulfide, carbonic acid, chromic acid, and oxalic acid are all examples of diprotic acids.

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Due to the hydrogen atom's single valence electron, it is represented as H.

Due to the hydrogen atom's single valence electron, it is represented as H. Lewis electron-dot structures can be used to represent the structures of molecules that are joined by covalent bonds.

A hydrogen ion is the nucleus of a hydrogen atom that has lost contact with its electron in orbit. A proton, or a particle with a single positive electric charge, is the building block of hydrogen. So a single hydrogen ion, denoted by the symbol H+, is typically used to represent a proton.

It's marked H+. The name of the hydrogen cation varies depending on the isotope: The term "hydron" refers to any hydrogen isotope's positive ion (H+). 1H+ for proton (i.e. the cation of protium)

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The air compresses as it cools. Additionally, fewer molecules travel around in colder air. Less pressure will be applied to the tire walls by the air molecules. As a result, your tires appear to be flat.

Many drivers will notice a low-pressure warning light on their dashboard as winter approaches, or they may just notice that their tires don't appear to be quite as full as they should. The temperature decline is primarily to blame for this since colder air is denser and requires less tire pressure.

In the winter, your tires lose air for the same physiological reason that medical professionals advise you to apply ice to an injury: cold temperatures promote contraction. Let's examine a closer examination of the science Warmer molecules travel more quickly. These swiftly moving molecules take up more room and disperse farther apart.

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The pull-down boxes to specify states such as (aq) or (s) conclude that equilibrium constant for this reaction is 2.8*10¹⁵.

The following chemical reaction equation results in the formation of the nickel cyanide complex.

Ni(OH)(s)+4CN=={Ni(CN)²₄]+2OH

We know that,

     K = Kf.Ksp

We are given that, Kf=1*10³¹

and,    Ksp=2.8*10⁻¹⁶

    K = Kf.Ksp

    K = (1*10³¹)*(2.8*10⁻¹⁶)

       = 2.8*10¹⁵

Thus, we can conclude that equilibrium constant for this reaction is 2.8*10¹⁵.

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The strongest type of intermolecular force between solute and solvent in the following solution CH3Cl(g) in CH3OCH3(g) is dipole - dipole.

The positive end of one polar molecule and the negative end of another polar molecule are attracted to one another by dipole-dipole forces. Strengths of dipole-dipole forces per mole range from 5 kJ to 20 kJ.

Examples of polar compounds that interact dipole-dipole include hydrogen chloride (HCl), carboxylic acids (such as acetic acid), and amino acids. A polar molecule's positive end will pull another molecule's negative end and change the other molecule's location.

Hence, dipole dipole is the strongest type of intermolecular force between solute and solvent in the following solution CH3Cl(g) in CH3OCH3(g) .

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while he is moving a container of a radioactive liquid, some of the liquid splashed onto the technician's arm is Primary contamination.

Ionizing radiation is the kind of energy that emanates from radioactive materials. Radiation energy may be absorbed by the body when it comes into touch with a person. The following substances are naturally occurring radioactive elements in earth.

When some radioactive elements decay or break down, an energy known as alpha radiation is emitted. Examples of naturally occurring radioactive elements in the Earth's crust include uranium and thorium. These two substances progressively alter over billions of years, yielding decay byproducts including radon and radium. Energy is discharged throughout this process. Alpha radiation is one manifestation of this energy.

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According to TABC laws on alcohol use, it is illegal to sell alcohol in many places in texas thus no you can't discount alcohol in Texas.

Alcohol is prohibited in many parts of Texas thus anyone under the age of 21 may not be sold alcohol, including adults. Beer and wine may be purchased from licensed establishments Monday through Friday from 7:00 a.m. to midnight. On Saturday, they may sell them from 7:00 a.m. until 1:00 p.m. Additionally, they may sell on Sundays from noon to midnight. Only liquor stores, nevertheless, are allowed to sell distilled alcohol. On Sundays before noon, restaurants are allowed to serve alcoholic beverages with food. On the other hand, it is prohibited to sell any alcoholic beverages with a volume of more than 17% on Sunday (ABV). On Thanksgiving Day, New Year's Day, or Christmas Day, no establishment may offer any alcoholic beverages. Alcohol from a single producer cannot be sold by a restaurant or other retailer. And alcohol cannot be sold by food trucks.

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The hot holding temperature for fried rice is 135°F or above.

Rice, pasta, and other plant-based foods that are intended for hot holding must be cooked to at least 135°F. When food is discovered to be below the recommended safe cooking temperatures: - Continue cooking the meal until the required temperature is reached.

Foods stored at hazardous temperatures encourage the growth of bacteria and other germs that can lead to food-borne illness. The practice of "hot holding" refers to keeping hot food prepared for public consumption. When food is kept at high temperatures, hot holding inhibits the growth of bacteria. This reduces the possibility that someone will become ill after consuming food.

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FALSE; water's hydrogen-oxygen bond is a covalent one. This is due to the insufficiency of the difference in electronegativity between these two elements.

The capacity of an atom to draw in an electron binding pair determines its electronegativity. The Pauling scale is the most often used. With a value of 4.0 given to fluorine, cesium and francium are really the least electronegative elements, with a value of 0.7.

An atom's propensity to draw electrons of electron density to itself is measured by its electronegativity. It determines that how shared electrons are allocated among the two atoms in some kind of a bond. The bigger an atom's electronegativity, the more strongly it is attracted toward the atoms in its bonds.

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The Miller-Urey experiment provides evidence that the nucleotide base adenine can be created by combining hydrogen cyanide and ammonia in water. Many further experiments were sparked by this one.

Joan Oro discovered in 1961 that mixing ammonia and hydrogen cyanide in water might produce the nucleotide base adenine. His work resulted in a significant amount of adenine, whose molecules were created from 5 molecules of HCN. Additionally, under these circumstances, a large number of ammonia atoms is produced from HCN and ammonia.

The chemical compound hydrogen cyanide, often known as prussic acid, has the formula HCN. It boils just a little bit over room temperature and is a colourless, incredibly deadly, combustible liquid.

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According to the given statement The reaction which occurs at the anode is Cu(s) → Cu2+ (aq) + 2e-.

Galvanic (or voltaic) cells produce an electric current through a redox process that is thermodynamically favorable. Each half-reaction occurs in its own compartment, or half-cell, which also contains an electrode. The anode is the electrodes where oxidation takes place, and the cathode is the electrodes where reduction takes place.

A redox reaction results in the production of electricity via a voltaic cell. The half reactions' reduction potentials can be used to calculate the voltage of the a voltaic cell. Batteries are made from voltaic cells and are a practical way to store electricity.

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The concentration should be about [tex]$1 / 6$[/tex] of the original [tex]$(1 / 6 \times 4.2=0.7)$[/tex]

The most common way to solve this problem is to use the formula

[tex]$$c_1 V_1=c_2 V_2$$[/tex]

In this problem,

[tex]&c_1=4.2 \mathrm{~mol} / \mathrm{L} ; V_1=45.0 \mathrm{~mL} \\[/tex]

[tex]&c_2=? ; V_2=250 \mathrm{~mL} \\[/tex]

[tex]&c_2=c_1 \times \frac{V_1}{V_2}=4.2 \mathrm{~mol} / \mathrm{L} \times \frac{45.0 \mathrm{~mL}}{250 \mathrm{~mL}}=0.76 \mathrm{~mol} / \mathrm{L}[/tex]

You are increasing the volume by a factor of about 6 , so the concentration should be about [tex]$1 / 6$[/tex] of the original [tex]$(1 / 6 \times 4.2=0.7)$[/tex]

The complete question is,

What would be the concentration of a solution made by diluting 45.0 mL of 4.2 M KOH to 250 mL?

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The molarity of the solution is  0.09018.

What is molarity ?

The quantity of a solute in a liter of a solution is known as its molarity.

What is moles?

The mass in grammes of one mole of a substance is its molar mass. The chemical unit's atomic weight, expressed in atomic mass units, determines this substance's mass. A mole of silver, for instance, weighs 107.8682 amu, or 107.8682 grams.

Molarity of the solution is defined as

molarity = moles of solute/ volumes of solution in liter

moles= mass/ molar mass

1) 0.248M

= 0.248/ 2.75= 0.09018

Therefore, the molarity of the solution is  0.09018.

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Dr. Metallica can change the property of an alloy by changing metal or non metal and their respective percentage in alloy.

The meaning of an alloy is a material created by combining two or more metals. Additionally, alloys can be created by combining metals with other elements. Alloys frequently display characteristics that vary greatly from those of their constituent parts. It is usual for alloys to be harder and stronger than pure metals. Copper and zinc are two metals that are mixed to make brass. A metallic element (iron) and a trace amount (up to 2%) of a non-metallic element are alloyed to form steel (carbon). Copper and tin are combined to make bronze. It is frequently used in medals, coins, trophies, heavy tools, electrical components, and gears. Bronze typically contains copper (Cu) in the range of 75% and tin (Sn) up to 12%.

Hence, property of alloy can be changed through constituent element and their percentage.

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If the components have boiling points that are significantly different from one another (by more than 100 °C), a simple distillation is utilized.

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Formaldehyde is a colorless, combustible gas that has a strong, pungent smell when it is at room temperature. Formaldehyde has a - 19.1 °C boiling point. 37% unrestrained

A wide range of industries employ formaldehyde. It is used in labs, building materials, textiles, embalming, disinfectants, glues and resins, dyes, and other products.

The throat, nose, eyes, and skin can all become irritated by formaldehyde. Certain cancer types may be brought on by high exposure levels. Learn more about the harm exposure to formaldehyde can do to your health from the Agency for Toxic Substances and Disease Registry.

Formaldehyde has been linked to myeloid leukaemia and a number of uncommon malignancies, including those of the paranasal sinuses, nasal cavity, and nasopharynx, according to studies of individuals exposed to high doses of the chemical, such as industrial employees and embalmers.

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The statement that is true about the two reactions is that: Reaction A produces more energy than Reaction B (option C).

Chemical reaction is a process, typically involving the breaking or making of interatomic bonds, in which one or more substances are changed into others.

A chemical reaction involves the conversion of substances called reactants to other substances called products usually as a result of bond breaking.

According to this question, two reactions occur as described below:

If an atom loses electrons, it becomes positively charged, hence, releasing energy into surroundings. On the other hand, an atom loses protons and neutrons in reaction B, this means that the identity of the atom will be changed because the proton number will be changed.

Therefore, it can be said that reaction A will synthesize more energy than reaction B because electrons are lost in the former.

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The environment can distinguish your character. Characters with uncommon backgrounds will always be seen as strange, whether or not they actually are.

Chemistry provides for all of our basic needs, including food, clothing, shelter, health, energy, and clean air, water, and soil. Chemical technologies provide new solutions to problems with hygiene, resources, especially energy usage, which enhance our quality of life in many ways.

The term in current usage often refers to the capacity to influence someone or something, particularly the capacity to bring about changes without exerting direct pressure.

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Chloromethane [tex](CH_{3}Cl)[/tex] is created when a combination of methane [tex](CH_{4})[/tex] and chlorine[tex](Cl_{2})[/tex] is exposed to ultraviolet light through a substitution reaction.

[tex]CH_{4} + Cl_{2} (excess) + UV = CH_{3}Cl[/tex].

What is Substitution reaction?

An atom, ion, or group of atoms or ions in a molecule is replaced by another atom, ion, or group in this class of chemical processes.

What is Ultraviolet light?

A higher frequency and shorter wavelength than visible light, ultraviolet (UV) radiation has a wavelength range of 100–400 nm. The sun is a natural source of UV radiation, but it can also be produced artificially by sources utilized in business, industry, and leisure.

What is Chloromethane?

Methyl chloride is another name for chloromethane. It is an uncoloured, transparent gas. Only when concentrations that could be dangerous are present does it emit a slight, sweet smell. It is incredibly combustible and heavier than air.

Chloromethane [tex](CH_{3}Cl)[/tex] is the major product.

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According to the given statement The sample begins to melt due to decompression.

The correct option is B.

The thawing and boiling extremes of water serve as the foundation for the two most popular test temperatures, Celsius (C) and Fahrenheit (F). There are 100 steps between the two locations on the Celsius scale and 180 on the Fahrenheit scale. Additionally, scientists employ the Kelvin units of the International System (K).

Thermometers are used to measure the air's temperature. Common thermometers have a glass rod inside of which is a very thin tube. A liquid is delivered to the tube from a storage, or "bulb," at the thermometer's base.

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We know that,

1000 ml = 1 L

Molar mass of NaOH = (1 x 22.990 + 1x 16.0 + 1 x 1.008) = 39.998 g/mol

Preparation of solution

The solubility of NaOH in water at 25 deg. C is 1000 g/L or 1 g/ml.

First, we have to know the amount of NaOH required for the preparation of the solution.

To do that, we calculate the number of moles in 300 ml of 0.100 M NaOH solution = (volume in L x Molarity of solution) = (0.3 L x 1 M) =0.3 mol.

Next, by definition, moles of solute = (mass of solute/molar mass of solute).

That is, 0.3 mol = (mass of NaOH/39.998 g/mol).

Therefore, mass of NaOH required for the preparation of solution = (0.3 mol x 39.998 g/mol)= 11.994 g

Thus, you weigh out 11.994 g of NaOH in a clean and dry glass beaker quickly in a fine balance. This is to prevent the water vapour and CO2 of the atmosphere from contaminating the NaOH as it is hygroscopic in nature.

Dissolve it in the beaker with 25 ml of distilled or deionized water.

Stir the solution with a clean glass rod to dissolve it further and allow it to cool down before any further dilution.

Transfer the solution carefully to a 300 ml volumetric flask.

Rinse the beaker and the glass rod with 15 ml of distilled or deionized water and transfer it to the flask.

Top up the flask carefully to the mark with more distilled or deionized water.

Stopper the flask and mix well.

This is your 300 ml of 0.100 M NaOH solution.

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