a molecule's three-dimensional structure, where simple lines stand in for links in the planes, wedge-shaped lines for bonds facing the observer, and dashed lines for bonds facing the viewer's opposite.
Examples of stereochemistry and what it is:The study of a molecule's three-dimensional structure is known as stereochemistry. The sole structural difference between the cis & trans isomers, which are types of stereoisomers, is where the elements of the molecule are situatedthree dimensionally. There may be differences in the chemical and physical properties of these stereoisomers.
What does organic chemistry's stereochemistry entail?The field of chemistry known as stereochemistry is concerned with "the study of the various spatial configurations of atoms in molecules." The methodical presentation of a particular area of science and technology, known as stereochemistry, typically necessitates a brief detour into the past.
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predict the products (if any) that will be formed by the reaction below. if no reaction occurs, write nr after the reaction arrow. be sure to include the proper phases for all species within the reaction.
The product is [tex]ZnSO[/tex]₄[tex](aq)[/tex] [tex]+ Fe(s)[/tex] and this is in aqueous form which is formed by the reaction [tex]FeSO[/tex]₄ [tex](aq) + Zn(s)[/tex] .
How does the reaction takes place?The reaction given in the question is,
[tex]FeSO[/tex]₄ [tex](aq) + Zn(s)[/tex]
When this net ionic reaction takes place completely it gives a product as
[tex]FeSO[/tex]₄ [tex](aq) + Zn(s)[/tex] ⇒ [tex]ZnSO[/tex]₄[tex](aq)[/tex] [tex]+ Fe(s)[/tex]
Where,
[tex]FeSO[/tex]₄ is Ferrous sulfate that is hydrous
[tex]Zn[/tex] is zinc that is solid
[tex]ZnSO[/tex]₄ is Zinc sulfate that is hydrous
[tex]Fe[/tex] is Iron or Ferrous that is solid
Here,
[tex]Zn[/tex] gets oxidized and [tex]Fe[/tex] gets reduced.
The reduction and oxidation reactions are follows :
Reduction reaction is ,
[tex]Fe[/tex] ² +2e ⟶[tex]Fe[/tex] ⁰
Oxidation reaction is ,
[tex]Zn[/tex] − 2e⁻ ⟶[tex]Zn[/tex] ²
What is Net Ionic equation?A net ionic equation is a chemical equation of a reaction that lists only the species involved in the reaction. The net ionic equation is commonly used in acid-base neutralization reactions, double displacement reactions, and redox reactions.
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given the standard enthalpy changes for the following two reactions: what is the standard enthalpy change for the following reaction? standard enthalpy change
the typical values for the enthalpy of formation: H fo[A] = 433 KJ/mol. H fo[B] equals -256 KJ/mol.
What is the typical cost equation?You must multiply the rate of each by the quantity to get these costs (in units or hours).For instance, if the unit size is 20 pounds and the cost of direct supplies is $10, $10 would be multiplied by 20 to equal $200. For just the direct materials, this would be the standard price.
What does the typical free energy change, G, mean?The change in Gibbs free energy that occurs when 1 mole of a compound is created from its component parts is known as the standard Gibbs free energy of compound formation. in their standard states, which are the element's most stable configuration at 25 °C and 100 kPa. fG is its symbol.
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a chemist adds of a barium chloride solution to a reaction flask. calculate the millimoles of barium chloride the chemist has added to the flask. be sure your answer has the correct number of significant digits.
The millimoles of barium chloride the chemist has added to the flask will be 2.6 x 10² mmol.
Volume of barium chloride (BaCl₂) = 425.0 ml
Molarity of BaCl₂ = 0.62 M
Number of mmol = ?
Calculate the number of mmol by using the following formula:
Molarity = moles (solute) / Volume (solution) in liter
As we have to find the number of mmol so rearrange the equation for mmol.
millimoles (solute) = Molarity x Volume (solution) in mL
millimoles of BaCl₂ = Molarity of BaCl₂ x Volume (solution) in mL
Put the values in the above equation.
mmol of BaCl₂ = 0.62 M x 425.0 mL
mmol of BaCl₂ = 0.62 mol/L x 425.0 mL
mmol of BaCl₂ = 263.5 mmol
mmol of BaCl₂ = 2.6 x 10² mmol
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The value of the formation constant for [Cu(NH3)4]2+ is 5.03x1013. Write the equilibrium reaction that shows the formation of this complex ion from copper (II) ion and aqueous ammonia. Remeber to write the formula for the complex ion in brackets, [ ], and to include states of matter
The equilibrium reaction that shows the formation of this complex ion from copper (II) ion and aqueous ammonia is Cu²⁺(aq) + 4NH₃(aq) ⇄ [Cu(NH₃)₄]²⁺(aq) Konstanta Formation 5.03x10¹³
When Cu²+ ions are in the presence of ammonia molecules in aqueous solution, a tetrahydrate complex is formed.
K f = K f = [[Cu(NH3)₄]²⁺]/[Cu²⁺][NH3]⁴
Cu²⁺(aq) + NH₃(aq) ⇄ [Cu(NH₃)]²⁺(aq)
[Cu(NH₃)]²⁺ + NH₃(aq)⇄ [Cu(NH₃)₂]²⁺(aq)
[Cu(NH₃)₂]²⁺ + NH₃ (aq) ⇄ [Cu(NH₃)₃]²⁺ (aq)
[Cu(NH₃)₃]²⁺ + NH₃(aq) ⇄ [Cu(NH₃)₄]²⁺(aq)
Equilibrium reaction:
Cu²⁺(aq) + 4NH₃(aq) ⇄ [Cu(NH₃)₄]²⁺(aq)
Also, Kf is defined as:
K f = [[Cu(NH3)4]2+]/[Cu2+][NH3]4
K f = 5.03x10¹³
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a modern penny weighs 2.7150 g but contains only 0.0600 g of copper (cu). how many copper atoms are present in a modern penny?
5.83 x 10^20 Cu atoms
calculating gas density what is the density of methane, ch4ch4 , in a vessel where the pressure is 910 torr torr and the temperature is 255 kk ? what is the density of methane, , in a vessel where the pressure is 910 and the temperature is 255 ? 16 g/lg/l 0.057 g/lg/l 0.92 g/lg/l 0.72 g/lg/l 697 g/lg/l
The density of methane gas at a pressure of 910 torrs and a temperature of 255K is equal to 0.92 g/L.
What is the ideal gas equation?The situation of quantity of gas is determined by its volume, pressure, and temperature. The ideal gas law can be demonstrated as the product of the volume and pressure is equal to the product of the gas constant and absolute temperature.
The mathematical representation for an ideal gas can be written as follows:
PV = nRT
PV = (m/M)× RT
(PM)/RT = m/V
D = PM/RT
Where n is the moles, T is the temperature, V is the volume, and R is the gas constant.
Given, the temperature of the gas, T = 255 K
The pressure of the argon gas, P = 910 torr = 1.19 atm
The molar mass of the methane gas, M = 16 g/mol
Substitute R, P, M, and T in the ideal gas equation, and we get:
The density of methane gas, D = PM/RT
D = 1.19 ×16/(0.082 × 255)
D = 0.92 g/L
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If a student accidentally adds deionized water past the calibrated mark on the volumetric flask, he should.
If a student accidentally adds deionized water past the calibrated mark on the volumetric flask, he should a) dump the excess solution until the volume is right at the mark.
When performing chemical reactions, it is important that each component or element of the reaction be measured accurately. If any of the components are not measured accurately, then it can result is a false result or no reaction to occur at all.
For adding water to a chemical reaction, often a volumetric flask is used. If you are using deionized water then it is important to add effectively the correct measured value of deionized water. If by mistake more deionized water is added to the volumetric flask, you should dump it until it reaches the right mark.
Although a part of your question is missing, you might be referring to this question:
If a student accidentally adds deionized water past the calibrated mark on the volumetric flask, he should:
a) dump the excess solution until the volume is right at the mark.
b) proceed with the excess amount
c) change the chemical reaction
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Is melting conduction convection or radiation?.
Melting is an example of convection.
Conduction can be understood as the process, which generally enables direct transfer of heat through the matter, this happens due to the difference in temperature, between adjacent parts of the object. It happens when the temperature of the molecules present in a substance increase, that is usually resulting in vigorous vibration.
Convection implies the form of heat transfer, by the real movement of matter, that usually occurs only in fluids. Fluid represents to any substance, whose molecules move freely from one place to another, such as liquid and also gases. It happens naturally or even forcefully.
The heat transfer mechanism in which there is no medium is required is called radiation. It refers to the movement of heat in waves, as it does not need any molecules to travel through.
Convection is a method of heat transfer that involves molecules within liquids such as gases and also liquid, It is best depicted by the melting ice, where snow melts as heat moves from the air to the ice. If we leave ice on the table, it will melt after sometime. The reason for this is that the surrounding area has become cold. Thus, cold transfer refers to the exchange of heat or also thermal energy between physical systems. When there is a difference in temperature between the two bodies, the ice is transferred from the colder body to the warmer body.
Hence, ice melting is an example of convection.
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What is a radical in math?.
the square root of nth root symbol, which is used in mathematics. Square-root-containing expressions are known as radical expressions. Radicand: A number or statement contained within the radical symbol.
What does the term "radical expression" mean?Square root and nth roots are represented by the symbol "radical," which. a square root is a component of a radical expression, which is an expression. Radicand: The value or expression contained on the inside of the radical symbol. An equation that uses radical expressions as radicands and contains variables is referred to as a radical equation.
Describe a radical expression with an example.Among some examples of radicals expressions are 2, 3 72, 2 x + 7, and 4 1 p. We will examine radical expressions in-depth today, including how to create and analyze them as well as how to use their characteristics to our advantage.
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What are we allowed to do with the hot water from the tap in the lab for the contest?.
The hot water from the tap can be used in labs for various purposes.
The hot water from the tap can be used for dilution purposes. It can be used in reactions that require water as a reactant.
The hot water that is present in taps can be used to make dilute solutions. As without water, some reactions won't proceed, water can be used as the reactant.
Also, hot water is excellent for acting as a mixture as their water that is warm can serve as an excellent source for mixing compounds.
Hot water can also be used in a lab for washing of equipments.
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what is the electron configuration for a silver atom? express your answer in condensed form as a string without blank space between orbitals. for example, [ar]4s23d104p4 should be entered as [ar]4s^23d^104p^4.
The electronic configuration of Silver is [Kr][tex]4d^{10}5s^{1}[/tex]
The electron configuration of an element generally describes how electrons are distributed in its atomic orbitals. Electron configurations of atoms follow a standardized rules in which all electron-containing atomic subshells along with the number of electrons they hold written in superscript form and they are placed in a sequence
However, the standard notation often yields lengthy electron configurations especially for elements having a relatively large atomic number . In such cases, an abbreviated or condensed notation may be used instead of the standard notation. In the abbreviated notation, the sequence of completely filled subshells that are corresponding to the electronic configuration of a noble gas is replaced with the symbol of that noble gas in square the brackets.
Atomic number of silver is 47, and the condensed electronic configuration can be written as [Kr][tex]4d^{10}5s^{1}[/tex]
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What food hazard must be removed during preparation?.
Natural-Items from nature such as bones, seeds, fruit pits, and other objects must be eliminated during preparation because they may cause major harm and food hazard must be removed during preparation.
Food contamination caused by food dangers like chemical, biological, and physical ones might hurt your customers. Customer safety can be improved by knowing how to prepare, store, and serve food correctly. It is best to avoid the food hazards that could cause food to become contaminated because no amount of cooking or manipulating food can ensure its safety after it has been contaminated. The physical risks that are present in food on a natural basis will be covered in this article, along with tips on how to keep them from tainting the food you prepare and serve. Natural-During preparation, it is necessary to remove any items that came from the natural world, such as bones, seeds, fruit pits, and other objects that could be very harmful.
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Identify the NMR term that corresponds to each description.
The area of a signal that corresponds to the number of nuclei at that frequency
The frequency at which a nucleus absorbs and resonates with a magnetic field
The appearance of multiple peaks for a single nucleus due to neighboring nuclei
The end of the NMR spectrum close to the reference signa
The end of the NMR spectrum far from the reference signal
The area of a signal that corresponds to the number of nuclei at that frequency = Integration
The frequency at which a nucleus absorbs and resonates with a magnetic field = Chemical shift
The appearance of multiple peaks for a single nucleus due to neighboring nuclei = Splitting
The end of the NMR spectrum close to the reference signal = Upfield
The end of the NMR spectrum far from the reference signal = Downfield
Identify the NMR term that corresponds to each description :
integrationchemical shiftsplittingupfielddownfieldThe are of signal which is corresponds to the nuclei at that frequency is known as the integration. The chemical shift is the difference between the resonance frequency and the tetramethylsilane in terms of part per million.
The splitting of the peaks causes in the presence of the proton to the magnitude of n+1 , n is the number if neighboring proton. splitting is known as the appearance of the multiple peaks. If the end of the NMR spectrum signals are far from the reference then its is down field. when the signals appear close to the reference signal then it is up field.
Thus, Identify the NMR term that corresponds to each description :
The area of a signal that corresponds to the number of nuclei at that frequency = Integration
The frequency at which a nucleus absorbs and resonates with a magnetic field = Chemical shift
The appearance of multiple peaks for a single nucleus due to neighboring nuclei = Splitting
The end of the NMR spectrum close to the reference signal = Upfield
The end of the NMR spectrum far from the reference signal = Downfield
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which one of these is likely to be soluble in hexane (C6H14)? select all that apply. a. NH3 b. CH3OH
c. benzene d. KCL e. decane (C10H22)
f. oil
The hexane(C₆H₁₄) is an alkane which has general molecular formula C_nH_2n+2 and it is soluble in benzene and decane(C₁₀H₂₂).
Non-polar compounds are the compounds which do not show the polarity and they cannot form any ions in a solution. In a given options, formula of benzene is C₆H₁₂, oil contains hydroxyl groups in it which are polar. Methanol is also polar in nature due to the hydrogen bond. KCl is a polar compound which forms K⁺ and Cl⁻ ions. According to the principle of like dissolves like, if any substance is polar it should be soluble in polar substance. If any substance is non-polar, then it should be soluble in non-polar. Hence, the compound hexane(C₆H₁₄) is soluble in only benzene and decane(C₁₀H₂₂).
Therefore, hexane(C₆H₁₄) is soluble in benzene and decane(C₁₀H₂₂). Hence, option c and e is correct.
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what are the main goals of this investigation? group of answer choices separation and identification of molecular compounds in an unknown solution separation and identification of negatively charged ions in solution separation and identification of ions in solution
A solution containing a mixture of metal ions can be separated by precipitation using anions like Cl, Br, SO₂,, CO₂,, S₂, Cr₂O₂, PO₂,, and OH, among others.
Precipitation can be used to distinguish certain metal ions from other metal ions when they combine to create insoluble salts with a certain anion. By precipitating the anions with the right metal ions, we may also separate the anions. Although the concentrations of their saturated solutions are tiny, medium, and high, there are no clear boundaries between insoluble salts, sparingly soluble salts, and soluble salts.
For insoluble and sparingly soluble salts, solubility products are typically included; however, they are not provided for soluble salts. For soluble salts, the solubility products are enormous.
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What is the electronegativity difference of of k and cl?
Answer:
[tex] \huge\fbox{2.34}[/tex]
Explanation:
Potassium (K): It is an alkali metal that lies in Group 1 of the periodic table, with an atomic number and electronegativity 19 and 0.82, respectively. There is only one electron in the outermost shell of potassium, so it prefers donating one electron to gain stability, and hence the tendency to pull or accept an electron is less in potassium.
Chlorine (Cl): It is an halogen that lies in group 17 of the periodic table, with an atomic number and electronegativity of 17 and 3.16, respectively. There is only one electron required to fulfil the outermost shell of chlorine, so it prefers accepting one electron, and hence the tendency to attract the electron is high for chlorine.
Electronegativity Difference of K and Cl = En of Cl- En of K
[tex]ED = 3.16 - 0.82[/tex]
[tex]ED = 2.34[/tex]
The electronegativity difference explains whether a compound is ionic or covalent.
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[tex]\Large\bold{SOLUTION}[/tex]
The electronegativity difference between potassium (K) and chlorine (Cl) can be calculated by subtracting the electronegativity value of K from the electronegativity value of Cl.
The electronegativity of potassium is 0.82 and the electronegativity of chlorine is 3.16 (on the Pauling scale).
[tex]\sf Difference_{(Electronegativity)} = CI_{(Electronegativity)} - K_{(Electronegativity)}[/tex]
[tex]\sf Difference_{(Electronegativity)} = 3.16 - 0.82[/tex]
[tex]\sf Difference_{(Electronegativity)} = 2.34[/tex]
Therefore, the electronegativity difference between K and Cl is 2.34.
[tex]\rule{200pt}{5pt}[/tex]
HELP PLEASE i’m literally sleep deprived because of this
i think you’re suppose to talk about the equilibrium switching and favouring things
In addition to H²O equilibrium, the reaction will move forward direction.
Le Chatelier's precept, additionally known as Chatelier's principle, is a precept of chemistry used to predict the impact of exchange in conditions on chemical equilibrium
Le Châtelier's principle states that if a dynamic equilibrium is disturbed by changing the situations, the position of equilibrium shifts to counteract the alternate to reestablish equilibrium. Le Chatelier's precept may be stated as follows: A exchange in one of the variables that describe a machine at equilibrium produces a shift inside the function of the equilibrium that counteracts the effect of this change.
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the reaction between c6 h12o6 and o2 is represented by the balanced equation above. in an experiment, 0.30 mol of co2 was produced from the reaction of 0.05 mol of c6 h12o6 with excess o2 . the reaction was repeated at the same temperature and in the same container, but this time 0.60 mol of co2 was produced. which of the following must be true? a the initial amount of c6 h12o6 in the container must have been 0.10 mol b exactly 0.30 mol of c6 h12o6 must have reacted because c atoms were conserved. c exactly 0.40 mol of o2 must have reacted because the temperature and container volume are the same. d more than 0.60 mol of o2 must have reacted because it was present in excess
There had to have been 0.10 mol of C₆H₁₂O₆ in the container.
The above reaction clearly indicates that when 1 mol of C₆H₁₂O₆ and 2 mol of CO₂ are combined and O₂ is given in excess, this combination alone determines the development of a product. Therefore, C₆H₁₂O₆ is a limiting reactant and O₂ is an excess reactant in this reaction.
To make 1 mol of CO₂ from 0.05 mol of C₆H₁₂O₆, it takes 6 times as much C₆H₁₂O₆.
Now, 0.60 moles of CO₂ must be produced from 0.6 divided by 6 mol of reactant, which equals to
moles of C₆H₁₂O₆ = 0.6/6 = 0.1 mol
Therefore, the initial amount of C₆H₁₂O₆ in the container must have been 0.10 mol.
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in the following diagram, identify and label two conjugate acid-base pairs. identify the acid and the base in each pair.
In the following diagram, identify and label two conjugate acid-base pairs. Identify the acid and the base in each pair.
What is the importance of acid?
Acids play significant roles within the human body. The presence of hydrochloric acid in the stomach helps digestion by breaking down large and complex food molecules. Amino acids are required for protein synthesis which helps to grow and repair body tissues
How do you identify acids and bases?
To decide whether a substance is an acid or base, count the hydrogens on each substance before and after the reaction. If the number has decreased that substance is the acid (which donates hydrogen ions) . If the number of hydrogens has increased that substance is the base (accepts hydrogen ions)
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What is the chemical equation for lactic acid?.
An organic acid is lactic acid. Its chemical formula is CH3CH(OH)COOH.
What results from the fermentation of lactic acid?Lactic acid (lactate) and NAD+ are produced during lactic acid fermentation. To enable glycolysis to continue and produce additional ATP, NAD+ cycles back.
Most sour milk products, including kumis, laban, yoghurt, kefir, and some cottage cheeses, contain lactic acid. Lactic acid causes the casein in fermented milk to coagulate, or "curdle." Additionally, lactic acid is in charge of giving sourdough bread its distinctive taste.
One of the organic acids is lactic acid. Lactic acid has the chemical formula C3H6O3. It is a chiral molecule as it contains two optical isomers, Levo and Dextro.
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How did Miller and Urey test this hypothesis?.
The Miller-Urey experiment provides evidence that the nucleotide base adenine can be created by combining hydrogen cyanide and ammonia in water.
What hypothesis were Miller and Urey testing?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.Miller-Urey supported the Primordial Soup Hypothesis because it concluded that organic molecules could beProduced in the presence of certain inorganic best explain the relationship between Miller-Urey and Primordial soup.The Miller Urey experiment refer to a form of chemical experiment that simulated the conditions present on the early Earth and tested the chemical origin of life using those conditions . The experiment performed at the time supported Alexander Oparin's and J. B. S. Haldane's hypothesis that putative conditions on the primitive Earth is important for chemical reactions to produce more complex organic compounds from simpler inorganic precursors.The first was the “primordial soup” which was a conclusion that when Earth was young, the oceans were filled with simple chemicals important for life and this assemble into living cells.To learn more about the Hypothesis refer to;
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What are 4 examples of radicals?.
Typical Free Radicals Radicals such as superoxide anion, hydrogen peroxide, hypochlorite, nitric oxide, and peroxyntrite
What is the purpose of hypochlorite?Most usually, bleach, also known as sodium hypochlorite, is used as a disinfectant. It works well to kill viruses, germs, fungi, and mycobacterium. It is a broad-spectrum disinfectant.
What effects does hypochlorite have on water?Similar to chlorine, sodium hypochlorite creates hypochlorous acid when it is discharged into water. The pathogens in the water, such as bacteria, viruses, and protozoa, then react with this acid and become inactive, making them unable to multiply or constitute a threat to human health.
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THE yellow,light given off by odium lamp ha awave length of 58. 9nm. What i frequency of thi radiation
The wavelength of yellow light is 580nm which is 580×10⁻⁹ m, so its frequency will be 5.17×10¹⁴ m/s.
The frequency and the wavelength are indirectly proportional to the each other. More is the wavelength, lesser is frequency and vice-versa. The speed at which a wave travels is equal to product of the frequency and wavelength, which justifies link between these two parameters.
V = λ f
where,
V is wave speed,
f is wave frequency,
λ is wavelength.
Given that,
Wavelength = 58.9nm
Speed of light= 3×10⁸ m/s
The frequency of yellow light will be
ν= c/λ
= 3.0×10⁸ m/s/ 580×10⁻⁹ m
=5.17×10¹⁴ m/s.
The wave number of yellow light,
νˉ = 1/λ
= 1/580×10⁻⁹ m
=1.72×10⁶/m.
So, the frequency of the sodium lamp will be 5.17×10¹⁴ m/s.
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a 25 ml sample of h2so4 was titrated with 3.52 ml of a 1.2 m naoh solution according to the reaction below. what was the concentration of the h2so4 sample?
The concentration of the H₂SO₄ solution used for titration is 0.168M.
The chemical equation of the reaction of the H₂SO₄ and NaOH is,
H₂SO₄ + NaOH → Na₂SO₄ + H₂O
So, we can see, from the reaction.
One mole of H₂SO₄ reacts completely with one mole of NaOH.
We know,
Moles = Molarity x volume
Molarity of H₂SO₄ x Volume of H₂SO₄ = Molarity of NaOH x volume of NaOH
Putting values,
Molarity of H₂SO₄ x 25 = 1.2 x 3.52
Molarity of H₂SO₄ = 0.168M.
So, the concentration of the H₂SO₄ solution is 0.168M.
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In the given three-dimensional molecular structure; the differently colored spheres represent different types of atoms Write molecular formula for this molecule formula:
The molecular formula of the compound is [tex]C_{7} H_{10} O_{2} N[/tex]
What is the molecular formula?We know that the molecular formula is the kind of formula that shows all the atoms that are present in the compound. Thus, we are looking at the kind of formula that gives the numbers of each atom in the compound.
There are three kinds of chemical formula;
Structural formula
Empirical formula
Molecular formula.
The image shows the arrangement of the atoms and we can use that to deduce the structural formula from the color codes shown.
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What are the four properties of mixtures?.
Four properties of mixture are- it's constitution is present in any ratio, energy is neither produced or evolved, no fixed melting or boiling point, components can be seperated.
A mixture is composed of two or more simpler substances. These can be compounds or chemical elements. There are 2 types of mixtures- homogeneous and heterogeneous. Four properties of a mixture-
1. The constituents of mixture can be present in any ratio and has no fixed composition.
2. Energy is neither produced nor evolved to form mixture.
3. The mixture has no fixed boiling points and melting points.
4. Components of mixtures can be separated by physical methods simply.
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How is climate change affecting the Northern Hemisphere?.
What type of change happens when chocolate melts?.
The melting of chocolate is an example of a physical change. When chocolate melts the solid state converts to the liquid state where the molecules becomes distant apart.
What are physical changes?A physical change involves the change in state of matter or phase change. It does not involves any breaking or making of chemical bonds. The changes which involves any chemical bond breaking or making or both it is called any chemical change.
In solid state, molecules are closely packed and have no space in between to move apart. Therefore, they form definite shape and volume. When solids converts to liquid they are said to be melting and needs temperature.
In liquid state molecules have some space to move apart and thus they don't have definite shape. When chocolate melts to form molten state, they under high temperature their molecules get far apart and starts to flow.
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what is the potential of the cell when it is prepared using 0.5 m zn(no3)2 solution, hydrogen gas at 1.2 bar and a ph of 5.5?
The potential of the cell when it is prepared using 0.5 m zn(no3)2 solution, hydrogen gas at 1.2 bar and a ph of 5.5 is 0.4416V
Ecell=E°cell-0.0591/nlog([Zn]*Ph2/[H⁺]²)
=0.76-0.0591/2log(0.5*1.184/3.162*10⁻⁶)²)
=0.4416V
ΔG=-nFE°
n=2,E°=0.76V
=-2*96485*.76
=-146.657 kj
The lightest substance is hydrogen. Hydrogen is a gas of diatomic molecules with the formula H 2 when conditions are normal. It burns easily and is non-toxic, tasteless, colorless, odorless, and odorless. With approximately 75% of all normal matter made up of hydrogen, it is the most prevalent chemical in the universe. Having the atomic number 1 and the letter H, hydrogen is the first chemical element. The lightest substance is hydrogen. Hydrogen has the formula H2 and exists as a gas under normal conditions. It burns easily and is non-toxic, tasteless, colorless, odorless, and odorless.
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What are the dangers of pewter?.
The dangers of pewter is when it can contains lead and and tin , then it is poisonous substance.
The old pewter contains a large amount of lead and tin and the tin is very harmful substance or it is poisonous substance. if we use the lead contain pewter on daily basis the the resulted in the chemical leaching out of the utensil will be absorbed by the human body which is very dangerous and may lead to the persons death. but now the pewters containing the lead is now no longer in use such as the jewelry's , cups, plates. so, now the pewter with no lead is not harmful for the human beings.
Thus the pewter containing lead is poisonous to the human life.
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