Which of the following greenhouse gases is entirely the result of human activity Mcq? 1. Methane
2. Carbon dioxide
3. Nitrous oxide
4. Chlorofluorocarbons

The number of moles in 7.52 × 10²² molecules of silicon dioxide is 0.125 moles.

The number of moles in a substance can be calculated by dividing the number of molecules by Avogadro's number as follows:

no of moles = no of molecules ÷ 6.02 × 10²³

According to this question, a sample of silica gel (SiO₂) contains 7.52 x 10²² molecules of silica. The number of moles can be calculated as follows:

no of moles = 7.52 × 10²² ÷ 6.02 × 10²³

no of moles = 1.249 × 10-¹

no of moles = 0.125moles

Therefore, 0.125 moles are present in 7.52 × 10²² molecules of silica.

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220.035 grams of HNO3 are needed to make 700.0 mL of a 5.0 M solution.

To make 700.0 mL of a 5.0 M solution of HNO3, we need to calculate the number of moles of HNO3 required, then convert that to grams. We can use the formula: Molarity = moles of solute / liters of solution.We know that the molarity is 5.0 M and the volume is 700.0 mL.

To convert mL to L, we divide by 1000. So: 5.0 M = moles of HNO3 / (700.0 mL / 1000)Solving for moles of HNO3: moles of HNO3 = (5.0 M) x (700.0 mL / 1000) = 3.5 moles of HNO3. Then we can use the molar mass of HNO3 to convert moles to grams.

HNO3 molar mass is 63.01 g/mol. So, the number of grams of HNO3 required is: 3.5 moles x 63.01 g/mol = 220.035 g. Therefore, 220.035 grams of HNO3 are needed to make 700.0 mL of a 5.0 M solution.

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The concept molarity is an important method which is used to calculate the concentration of a solution. It is mainly employed to calculate the concentration of a binary solution. Here the grams of HNO₃ is 220.53 g.

The term molarity is defined as the number of moles of the solute present per litre of the solution. It is represented by using the letter 'M' and its unit is mol/L. The term molarity is also known as the molar concentration.

Molarity = Number of moles of the solute / Volume of the solution in litres

700.0 mL = 0.7 L

Number of moles  = Molarity × Volume of the solution

5.0 × 0.7 = 3.5

Number of moles = Mass / Molar mass

3.5 = m / 63.01

m = 220.53 g

Thus the mass in grams of HNO₃ is 220.53 g.

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A substance with a molar mass of 34.01468g/mol and an empirical formula of Hydrogen and oxygen  and a molecular formula of twice has a composition of 5.9265% hydrogen and 94.0735% oxygen.

Thus Molecules are described by the empirical formula, where n = 1, 2, and 3. You can use the empirical formula to ascertain the molecular formula if you are aware of the molar mass of the chemical. Calculate the empirical formula mass first, and then divide the compound molar mass by it to get the empirical formula mass. Compounds are chemical entities comprised of a large number of comparable molecules.

Empirical equation equals Molecular formula

Hydrogen = 5.9265/atm weight: 5.9265/5.8795 = 1 (approximately)

Oxygen = 94.0735/16: 5.8795/5.8795 = 1

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The pair of reaction will be solvolysis. Both reaction will occur by SN1 mechanism.        

Solvolysis is a chemical reaction in which the solvent, such as water or the alcohol, is one of the reagents and it is present in great excess of that required for the reaction.

For the two reactions, the organic product is the same. Both the reactions will occur by SN1 mechanism since the substrate is a tertiary alkyl halide and the nucleophile is CH3OH as well as the rate of reaction depends on the concentration of the alkyl halide and the independent of the concentration of methanol present.

Therefore, change the volume of the solvent has no effect on the rate of reaction. The two reactions will proceed exactly the same rate since the initial concentration of the alkyl halide is the same for both the reactions.

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Answer:

equilibrium expressions do not have units because the concentration or pressure terms that go into them are really ratios having the forms (n mol L–1)/(1 mol L–1) or (n atm)/(1 atm) in which the unit quantity in the denominator refers to the standard state of the substance

Explanation:

Answer:

I don't understand what you mean

Answer:

Physical Change

Explanation:

Melting of Wax Is a Physical Change but Burning of Wax Is a Chemical Change: Melting of wax, by itself, involves a change of state from solid to liquid.

The volume of a sodium atom in cubic meters is 6.434×10[tex]^-6[/tex] cubic meters.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

As the atom is sphere , volume is (r)³=(186)³=6.434×10[tex]^-6[/tex] cubic meters.

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Answer:

Explanation:

a. Double Replacement: CH3COOH(aq) + NaHCO3(aq) --> CH3COONa(aq) + H2O(l) + CO2(g)

b. Decomposition: H2CO3(aq) --> H2O(l) + CO2(g)

c.Overall: CH3COOH(aq) + NaHCO3(aq) --> CH3COONa(aq) + H2O(l) + CO2(g) + CO2(g)

When Iron metal reacts with aqueous silver nitrate to produce aqueous iron(iii) nitrate and silver metal this will be represented as Single replacement reaction. In this the molecules of the chemical get replaced by other molecule.

This can be properly defined as, when One element in a molecule is replaced by another in a chemical reaction known as a single-displacement reaction, sometimes referred to as a single replacement reaction or exchange reaction.

It may be generalized as follows:

A + BC ⟶ AC + B.

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Answer:

sand's specific heat capacity is low that water(i.e. 830J/kg°C) Due to it's low specific heat capacity it gets hotter easily. That's whythe sand on the shores of the lake feels so much hotter than the water in the lake even though the same solar energy is being absorbed by both materials.

The type of the halide's leaving property determines how quickly an alkyl halide will undergo an E2 reaction. A set of systematic guidelines for using with organic molecules are the IUPAC nomenclature.

In one method, the bromine in an SN2 reaction is replaced with a methanethiolate nucleophile. In the alternative (bottom) pathway, the methoxide ion participates inside an elimination reaction as a base instead of a nucleophile.

Consequently, the quicker the E2 reaction, the better this leaving group is in E2 interactions as well. Below is a list of the most typical leaving group in nucleophilic replacement and removal reactions: As we previously established, the quicker the E2 elimination, the stronger the base.

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The empirical formula of lysine is C₆H₁₄N₂.

By calculating the smallest whole number ratio from the mass percentages of a compound's constituent parts, it is possible to calculate its empirical formula.

We must first establish how many moles of each element are included in 1.50 g of lysine in order to determine the empirical formula for lysine. The mole ratios of the elements may then be calculated using these values and will match the ratio of the subscripts in the empirical formula.

We may determine how many moles of carbon and hydrogen are contained in 1.50 g of lysine by computing the mass of generated CO₂ and H₂O.

Moles of C = 2.72 g CO₂ x (1 mol CO₂ / 44.01 g CO₂) = 0.062 moles

Moles of H = 1.29 g H₂O x (2 moles H / 18.02 g H₂O) = 0.143 moles

Secondly, by being aware that lysine also generated 0.287 g of N. We can determine how many moles of N there are.

moles of N = 0.287 g N x (1 mole N / 28.02 g N) = 0.0102 moles

By dividing each element by the minimum number of moles, which is 0.0102 moles, we can now determine the ratio of the elements.

C = 0.062 moles / 0.0102 moles = 6

H = 0.12 moles / 0.0102 moles = 14

N = 0.0102 moles / 0.0102 moles = 1

Therefore, the empirical formula of lysine is C₆H₁₄N₂

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The phosphorus had a higher affinity for the cells than the sulfur.

Phosphorus is a chemical element that has the symbol P and atomic number 15. It is a nonmetallic, multivalent, and highly reactive element that is an essential component of life. Phosphorus is found in many fertilizers and is an important component of DNA and RNA. In plants, phosphorus helps with energy production, root growth, and seed production. In animals, phosphorus helps with growth and development, muscle contraction and nerve impulse transmission, and cellular communication.

This suggests that the radioactive phosphorus was taken up by the cells and incorporated into their structure, while the radioactive sulfur was not able to be taken up by the cells and remained in the supernatant. Therefore, the phosphorus had a higher affinity for the cells than the sulfur.

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Although the theoretical yield is 25.0 grams, the actual yield is only 20.0 grams. utilizing the percent yield stoichiometry formula.

Chemical The quantitative analysis of the reactants and products involved in a chemical process is known as stoichiometry. Stoichiometry is a combination of the Greek words "stoikhein," which means element, and "metron," which means measure.

Stoichiometric challenges can be divided into four groups: conversion from mass to mass. Mole conversion from mass. Conversion from moles to mass stages.

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(A) 0.00 g of CH4 remains after the reaction.

To determine how much CH4 remains after the reaction, we need to use the balanced chemical equation and the concept of stoichiometry.

The balanced chemical equation for the reaction is:

CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(g)

From the balanced equation, we know that 1 molecule of CH4 reacts with 2 molecules of O2.

We are given that 10.0 g of CH4 and 15.0 g of O2 react. We can use this information to determine the number of moles of CH4 and O2 that react.

1 mole of CH4 weighs 16.04 g and 1 mole of O2 weighs 32.00 g.

10.0 g of CH4 is equal to:

10.0 g / 16.04 g/mol = 0.623 mol CH4

15.0 g of O2 is equal to:

15.0 g / 32.00 g/mol = 0.46875 mol O2

Since the reaction is 2:1 ratio of O2: CH4, so 0.46875 mol O2 is enough for 0.234375 mol of CH4

So, no CH4 remains after the reaction.

Therefore, the answer is (A) 0.00 g of CH4 remains after the reaction.

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Starting and stabilizing the stir function.

Pouring solids into a beaker or other container. To pour liquid, other types of funnels can be utilized. Pouring liquid into a beaker. A powder funnel is a funnel with a broad opening that is used for solids.

Start by beginning and stabilizing the stir function when heating a solution to boiling on a hot plate. To begin, reduce the heat to a medium setting. After approximately ten minutes of not witnessing boiling, increase the heat setting if required. When a certain amount of solute is dissolved in a solvent at constant pressure, the net result of energy absorbed or released as heat by the solution.

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The majority of a hydrocarbon mixture which makes up natural gas is composed of the two saturate light paraffins methane and ethane, which are gaseous in an atmosphere.

During a reversible chemical process, chemical equilibrium is the state in which there is no net change in the quantity of reactants or products. As "balancing" is the definition of the word "equilibrium," it follows that what a chemical process represents an equilibrium between the products and reactants involved in the reaction. a situation in which opposing forces are acting in balance or at rest. equitable distribution of all forces, effects, etc.; equal impact. emotional or mental equilibrium; equanimity: She lost it under the burden of the circumstances.

Chemical equilibrium is the condition of a system in which the parameters of the system remain constant over time and neither the reactant concentration nor the product concentration changes. The system enters chemical equilibrium when the forward reaction rate and the reverse reaction rate are equal.

The percentages of nitrogen, oxygen, argon, and other gases, respectively, in the Earth's atmosphere are around 78%, 21%, 0.9 percent, and 0.1%. Other gases that make up the remaining 0.1 percent include minute amounts of neon, carbon dioxide, and methane. Substances called gases are those that can exist under one atmosphere of pressure. The 11 gases are oxygen, neon, krypton, radon, xenon, hydrogen, chlorine, and fluorine. These are referred to be pure gases since they are all elements.

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Cl and K.  the following pairs of elements would be most likely to form an ionic compound AP and BR B Zn and KCC and OD Al and RB A chemical element is a type of atom.

with a certain number of protons in its nucleus, including the pure material made up entirely of that species. [1] Chemical elements, unlike chemical compounds, cannot be broken down into simpler substances by any chemical process. The number of protons in the nucleus is an element's distinguishing attribute, and it is symbolized by the symbol Z - all atoms with the same atomic number are atoms of the same element. [1] Almost all of the universe's baryonic stuff is made up of chemical elements (among rare exceptions are neutron stars).Cl and K.  the following pairs of elements ould be most likely to form an ionic compound AP and BR B Zn and KCC and OD Al and RB A chemical element is a type of atom.

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The total number of millimoles present in the solution containing 161 mg of Na ions are 7.04 millimoles/L.

A substance's concentration in a quantity equivalent to a thousandth of a mole (a measure of the amount of a substance). as well known as millimole.

You would need to multiply the number of moles of sodium ions (Na+) in the solution by the number of litres of solution in order to get the number of millimoles represented in the solution.

Divide the given milligrames (mg) by the molar mass of sodium ion to convert mg to moles (22.99).

Therefore, 161 mg/L is 161/22.99 = 7.04 10⁻³ moles/L.

You would now need to multiply 7.04 10⁻³ moles/L by 1000 to convert from moles/L to millimoles/L.

Thus, 7.04 10⁻³ moles/L multiplied by 1000 equals 7.04 millimoles/L.

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SO2 is a compound made up of sulfur and oxygen atoms, while SiO2 is a compound made up of silicon and oxygen atoms. The difference in their melting points can be attributed to their chemical structures and the types of chemical bonds that hold the atoms together.

In SO2, the sulfur atom is bonded to two oxygen atoms through covalent bonds. Covalent bonds are formed when atoms share electrons, and they tend to be relatively weak. As a result, the bonds in SO2 are not very strong and do not require a lot of energy to break. This means that SO2 has a relatively low melting point of 201 K.

In contrast, SiO2 is a network-solid, and the Si-O bond is covalent in nature and relatively strong. The network structure of SiO2 means that the atoms are tightly bound to one another in a repeating pattern. To melt SiO2, a large amount of energy is needed to break the strong covalent bonds between the atoms. This results in a high melting point of 1,883 K.

In summary, the difference in melting points of SO2 and SiO2 is due to the different types of chemical bonds and structures present in each compound. SO2 is held together by weaker covalent bonds, while SiO2 is held together by stronger covalent bonds in a network structure.

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The difference in melting points between SO2 and SiO2 can be attributed to their different chemical structures and bonding types.

SO2 is composed of sulfur and oxygen atoms, which form a polar covalent bond. This means that the electrons are shared equally between the atoms, but the electrons are attracted more strongly to one atom than the other, creating a partial positive and partial negative charge.

The polar nature of the SO2 molecule creates relatively weak intermolecular forces, such as dipole-dipole interactions, which results in a relatively low melting point.

SiO2, on the other hand, is composed of silicon and oxygen atoms, which form covalent bonds. The covalent bond in SiO2 is much stronger than the polar covalent bond in SO2, as the electrons are shared equally between the atoms and there is no partial positive or negative charge. As a result, the intermolecular forces in SiO2 are much stronger, such as covalent bonds, which results in a much higher melting point.

Additionally, SiO2 is a network solid, meaning that the atoms are held together by a three-dimensional network of covalent bonds. This network structure makes SiO2 much more difficult to melt than SO2, as it requires a large amount of energy to overcome the covalent bonds holding the atoms together. This is another reason why SiO2 has a higher melting point than SO2.

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Because of their hydrophobic tails & hydrophilic head, phospholipids constitute amphipathic molecules.

A phosphate and a choline molecule (blue) make up the hydrophilic head (orange). This head is joined to a triglyceride (green) that has two fatty acid tails that are hydrophobic (purple). (D) This image reveals the precise atoms that make up each of the phosphatidyl molecule's subdomains.

A individual phospholipid molecule comprises two parallel chains of oleic acids that create the lipid "tails" and a phosphate group, which is referred to as the "head," on the other end. The phosphate group's negative charge group makes the head neutral and hydrodynamic, or "water loving," in nature. As a result, the acid heads are drawn to the water.

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The temperature (T) at which the given reaction has ΔG°=-38.5 kJ, ΔH°=-14.6 kJ, and ΔS°=0.152 kJ/K is 1273.7 K.

Temperature is a physical property of matter that measures the average kinetic energy of the particles in a system. It is measured by thermometers and expressed in units such as degrees Fahrenheit (°F) and degrees Celsius (°C). Temperature is a fundamental factor in determining the nature of the physical and chemical changes that occur in matter.

The temperature (T) that corresponds to the given ΔG°, ΔH°, and ΔS° values can be determined using the equation ΔG° = ΔH° - TΔS°.
Substituting the given values yields:
-38.5 kJ = -14.6 kJ - T(0.152 kJ/K)
Rearranging yields:
T = -38.5 kJ + 14.6 kJ / 0.152 kJ/K = 1273.7 K.
Therefore, the temperature (T) at which the given reaction has ΔG°=-38.5 kJ, ΔH°=-14.6 kJ, and ΔS°=0.152 kJ/K is 1273.7 K.

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One mole of Mg contains  6.022 × 10²³ number of Mg atoms. Hence, number  of moles of Mg that contains 2.5 × 10²⁵ atoms is 41.5 moles.

Any substance  that contains   6.022 × 10²³ number of atoms is called ne mole of that substance. This number is called Avogadro number. Hence, one mole of every elements contains Avogadro number of atoms.

Magnesium is 12th element in periodic table. It is an alkaline earth metal. The number of atoms in one mole of Mg is equal to Avogadro number. Mass of the element with one mole of amount is called its atomic mass.

Number of moles of Mg that contains 2.5 × 10²⁵ atoms :

= 2.5 × 10²⁵ atoms/6.022 × 10²³ = 41.5 moles.

Therefore, 41.5 moles of Mg contains 2.5 × 10²⁵ atoms.

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Solid argon is thick than liquid argon because the emulsion wind has a positive pitch, and the solid phase is stable at advanced pressure.

 The critical temperature for a pure substance is the temperature above which the gas cannot come liquid, anyhow of the applied pressure.

For a pure substance, the critical pressure is defined as the pressure above which liquid and gas cannot attend at any temperature. The critical temperature for a pure substance is the temperature above which the gas cannot come liquid, anyhow of the applied pressure.

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Answer:

Glasses or contact lenses correct vision because they allow the eye to focus light in the right spot on the retina the spot that produces the clearest image. Because everyone's eyes are different, a pair of glasses that makes one person see wonderfully may look terribly blurry to someone else.

Nearsighted- unable to see things clearly unless they are relatively close to the eyes, owing to the focusing of rays of light by the eye at a point in front of the retina; myopic.

Farsighted- a common vision condition in which you can see distant objects clearly, but objects nearby may be blurry. The degree of your farsightedness influences your focusing ability.

Explanation:

I hope that makes sense

The equation that is balanced for the synthesis reaction for the formation of sulfur dioxide (SO₂) is as follows: S + O₂ → SO₂ (option D).

A 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 synthesis or combination reaction is a specific type of chemical reaction that involve two or more chemical species combining to form a more complex product:

A + B → AB

According to this question, sulfur combines with oxygen in a synthesis reaction to form sulfur dioxide as follows: S + O₂ → SO₂.

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Answer:

The impala population will decrease.

Explanation:

We learn that leopards eat both baboons and impalas.  If one of these two species is reduced in abundance, the leopards will increase consumption of the alternative, in this case impalas.  An analogy:  If you eat only chicken and beef, and the local store ran out of chicken, you'd choose beef, as everyone else in the same predicament.  The leopards see fewer baboons because of the disease, so they'll start hunting more impalas, and the impala population will decrease.

A Lewis dot structure, also known as an electron dot structure, is a way of representing the valence electrons of an atom in a chemical compound.

It uses dots (also called "electron dots" or "Lewis dots") to represent the valence electrons of an atom. The number of dots around an atom is equivalent to the number of valence electrons in the neutral atom.The Lewis dot structure is written by placing the chemical symbol of the atom at the center and placing dots around it to represent its valence electrons. For example, the Lewis dot structure of carbon (C) would be represented as:C.with four dots around it, representing the four valence electrons of carbon. In a Lewis dot structure, the valence electrons are represented by dots, which are placed around the chemical symbol of the element.

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a.) Physical change ; b.) chemical change. c.)  Chemical change d.) chemical change.

In physical change, there is no change in the chemical composition of the substance and change is only on physical properties. In chemical change, there is the combination of two or more substances that combine to form a new one.

a.) Mothballs gradually vaporize in closet is the -- Physical change

b.) Hydrofluoric acid attacks glass and is used to etch calibrations marks on glass laboratory utensils is the -- chemical change.

c.) French chef making sauce with brandy is able to burn of the alcohol from the brandy leaving just the brandy flavoring is-- Chemical change

d.) Chemistry major sometimes get holes in the cotton jeans they wear to lab, because of the acid spills is the-- chemical change.

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When CH2OH is introduced into the previously evacuated vessel , A physical change takes place because intermolecular attractions are overcome. The correct option to this question is D.

Remove (or evacuate) the air between two glass tubes to form a vacuum and reduce heat loss through conduction and convection.

Methanol is known to contain extremely polar oxygens, so it can exhibit hydrogen bonding. It is known that methanol can form very strong hydrogen bonds. Hydrogen bonds are known to form when the positive charge of hydrogen atoms accumulates significantly.

Hydrogen bonding is a unique type of inter-dipole attraction between molecules rather than covalent bonding to hydrogen atoms. This results from the attraction between a hydrogen atom bonded to an extremely electronegative atom such as an O, N, or F atom and an additional extremely electronegative atom.

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