In order to have a positive charge, an atom must have ________. In order to have a positive charge, an atom must have ________. A. more electrons than protons B. more protons than neutrons C. more neutrons than protons D.more protons than electrons

Answer:

1-butanol has higher boiling point mainly due to presence of hydrogen bonding.

Explanation:

Diethyl ether is a polar aprotic molecule due to presence of polar C-O-C moiety. Hence only dipole-dipole intermolecular force exist between diethyl ether molecules.

1-butanol is a polar protic molecule due to presence of C-OH moiety. Therefore dipole-dipole force along with hydrogen bonding exist between 1-butanol molecules.

So, intermolecular force is higher in 1-butanol as compared to diethyl ether. Hence more temperature is required to break intermolecular forces of 1-butanol to boil as compared to diethyl ether.

So, 1-butanol has higher boiling point mainly due to presence of hydrogen bonding.

Answer:117 degree Celsius

Explanation: this is due to the hydrogen bonding between the OH of the alcohol

Answer: option B. Black ice is an example of a physical change

Explanation:

Black ice forming on a road or sidewalk is an example of a physical change because it involves a transformation in the physical state of water (from liquid to solid) without changing its chemical composition.

The correct answer is option B.

Black ice forms when a thin layer of water on a sidewalk or road freezes after the temperature drops below the freezing point. This process involves a physical change, not a chemical change. Here's why:

Physical Change:

A physical change is a transformation in which the substance's chemical composition remains the same, but its physical properties, such as state of matter or appearance, are altered. Black ice is formed when liquid water (H₂O) undergoes a physical change as it freezes into solid ice. During this process, water molecules reorganize themselves into a crystalline structure, but the chemical identity of the molecules (H₂O) remains unchanged. Thus, black ice is still composed of H₂O molecules, making it a physical change.

Chemical Change vs. Physical Change:

In a chemical change (chemical reaction), the substances involved undergo a transformation at the molecular or atomic level, leading to the creation of new substances with different chemical compositions. In contrast, physical changes do not alter the chemical composition of the substances; they only affect their physical properties.

In the case of black ice, no new substances are formed, and the chemical composition (H₂O) remains constant throughout the process. Therefore, it is a clear example of a physical change.

Therefore, from the given options the correct one is B.

For more such information on;Black ice

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When Ca(OH)2 and HNO3 are mixed, the dominant components in the solution are H2O, Ca2+, OH-, and NO3-

When one mole of Ca(OH)2 and four moles of HNO3 are mixed in water, the dominant components in the solution would be H2O, Ca2+, OH-, and NO3-. The balanced chemical equation for the reaction is:

Ca(OH)2 + 2HNO3 → Ca(NO3)2 + 2H2O

The reaction between Ca(OH)2 and HNO3 results in the formation of calcium nitrate (Ca(NO3)2) and water (H2O), while the hydroxide ions (OH-) and nitrate ions (NO3-) remain in solution.

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The given question is incomplete. The complete question is as follows.

Citrate synthase catalyzes the reaction

Oxaloacetate + acetyl-CoA [tex]\rightarrow[/tex] citrate + HS-CoA

The standard free energy change for the reaction is -31.5 kJ*mol^-1

( a) Calculate the equilibrium constant for this reaction a 37degrees C

Explanation:

(a).  It is known that , relation between change in free energy ([tex]\Delta G[/tex]) of a reaction and equilibrium constant (K) is as follows.

             [tex]\Delta G = -RT \times ln K[/tex]  

where,  T = temperature in Kelvin

The given data is as follows.

         T = 310 K,       [tex]\Delta G = -31.5 kJ /mol = -31500 J/mol[/tex]  (as 1 kJ = 1000 J)

Now, putting the given values into the above formula as follows.

     ln K = [tex]\frac{-(\Delta G)}{RT}[/tex]

            = [tex]\frac{31500}{8.314 \times 310}[/tex]

      ln K = 12.22

         K = antilog (12.22)

           = [tex]2.1 \times 10^{5}[/tex]

Therefore, we can conclude that value of equilibrium constant for the given reaction is [tex]2.1 \times 10^{5}[/tex].

Explanation:

A property that does not bring any change in chemical composition of a substance are known as physical properties.

For example, shape, size, mass, volume, density, hardness etc of a substance are all physical properties.

On the other hand, a property that changes chemical composition of a substance is known as chemical property.

For example, precipitation, reactivity, toxicity etc are chemical property.

Therefore, given descriptions are separated according to their physical and chemical properties as follows.

Physical properties:

Chemical properties:

Zinc's physical properties include hardness on the Mohs scale, density at a certain temperature, and melting point. Its chemical properties include its reaction with sulfuric acid to release hydrogen and dissolve, and its ability to react with oxygen to form zinc oxide.

The descriptions of zinc can be categorized into physical properties and chemical properties. Physical properties are characteristics that can be observed without changing the identity of the substance. For zinc, the physical properties include its hardness on the Mohs scale (2.5), its density (7.13 g/cm³ at 25°C), and its melting point (420°C).

On the other hand, chemical properties can only be observed during a chemical reaction, changing the substance's identity. For zinc, the chemical properties include its reactivity with sulfuric acid, which releases hydrogen and dissolves the metal, and its reaction with oxygen gas at elevated temperatures to form zinc oxide (ZnO).

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Answer:

C. number of neutrons

Explanation:

Isotopes -

For some elements , there are various forms possible , which have different number of neutron , are referred to as the isotopes .

The isotope of a specific element have same number of protons , they only alters in the number of neutrons.

Hence , from the question,

The correct option for the given information is C. number of neutrons .

Answer: C. Number of neutrons

Explanation: Since it indicates the exact same element so the number of protons must be the same as it represents the atomic number. Isotopes of the exact element have an altered number of neutrons on its nucleus.

Answer:

b) c) and d)

Explanation:

a) octane. Organic, does not mix with water or form aqueous solution in water insoluble in water

b) potassium bromide. Easily mixes with water soluble in water

c) sodium bromide. Easily mixes with water soluble in water

d) lithium chloride. Easily mixes with water soluble in water

e) heptane. Organic, does not mix with water or form aqueous solution in water insoluble in water

Answer: the integers are 9,11 and 13

Explanation:Please see attachment for explanation

Answer:

neutrons

Explanation:

Atomic number : It is defined as the number of electrons or number of protons present in a neutral atom.

Mass number is the number of the entities present in the nucleus which is the equal to the sum of the number of protons and electrons.

Mass number = Number of protons + Number of neutrons

Thus both C14 and C12 have same number of protons as they have same atomic number.

The difference in the mass number of both the isotopes is sue to the difference in the number of neutrons.

Atomic number  = Number of protons = 6

For CC- 14, Number of neutrons = 14 - 6 = 8

For C 12, Number of neutrons = 12 - 6 = 6

Answer:

mass number

Explanation:

bc it just is

Answer:

The answer is B. Li

Explanation:

2Li will be needed to form an ionic compound because the known element sulphur requires 2 (two) electron to complete  its octet configuration.

So reacting with Lithium (2Li) will balance their electronic configuration.

Final answer:

Lithium (Li) is the most likely identity for element 'X' because it forms a +1 cation (Li+), which would combine with the -2 charge of a sulfide ion (S₂-) to create the compound Li₂S. Option B

Explanation:

When considering the reaction with sulfur to form an ionic compound of the form X₂S, we are looking for an element that can form a +1 oxidation state to balance the -2 charge on the sulfide ion (S₂-). Among the options provided, lithium (Li) is a member of the alkali metals (group 1) and naturally forms a +1 charged ion (Li+). Therefore, when it reacts with sulfur, it would form Li₂S, making lithium the most likely candidate for element 'X' in the given formula.

Other options, such as magnesium (Mg) and aluminum (Al), are in group 2 and 13 respectively, and typically form +2 and +3 ions. Chlorine (Cl) is a nonmetal and would not form a compound with the general formula X₂S. Cerium (Ce) is a lanthanide and it primarily forms compounds in a +3 or +4 oxidation state, not +1. Therefore, these elements are not suitable candidates for element 'X' given the provided compound formula.

Answer:

H must pair with Fluorine, Oxygen, or Nitrogen

Explanation:

water has polar covalent bonds, the intermolecular forces are hydrogen bonds, London and Dipole forces

Final answer:

The formation of hydrogen bonds requires hydrogen atoms and polar covalent bonds. Hydrogen atoms in polar covalent bonds have a slightly positive charge and are attracted to neighboring negative charges, forming weak interactions known as hydrogen bonds. Hydrogen bonds occur between water molecules and are responsible for many of water's unique properties.

Explanation:

The formation of hydrogen bonds requires hydrogen atoms and polar covalent bonds.

When polar covalent bonds containing hydrogen form, the hydrogen in that bond has a slightly positive charge because hydrogen's electron is pulled more strongly toward the other element and away from the hydrogen. Because the hydrogen is slightly positive, it will be attracted to neighboring negative charges. When this happens, a weak interaction occurs between the hydrogen's 6 from one molecule and the molecule's 6 charge on another molecule with the more electronegative atoms, usually oxygen. Scientists call this interaction a hydrogen bond. This type of bond is common and occurs regularly between water molecules. Individual hydrogen bonds are weak and easily broken, however, they occur in very large numbers in water and in organic polymers, creating a major force in combination. Hydrogen bonds are also responsible for zipping together the DNA double helix.

Answer:

The answer to your question is 32.44 moles

Explanation:

Data

moles of Na₂CO₃ = ?

volume = 9.54 l

concentration = 3.4 M

Formula

Molarity = [tex]\frac{number of moles}{volume}[/tex]

Solve for number of moles

number of moles = Molarity x volume

Substitution

Number of moles = (3.4)( 9.54)

Simplification

Number of moles = 32.44

Answer: 32.4 moles Na2CO3

Explanation: Molarity is moles of solute per unit Liter of solution

M= n/L

To solve for moles (n) we derive the equation:

n = M x L

= 3.4 M x 9.54 L

= 32.4 moles Na2CO3

Answer:

To draw or sketch a Lewis structure, formula or diagram, the chemical formula of the compound is essential. Without it you can not even know what are the atoms that make it up, in our case it is the one observed in the reaction shown:

[tex]BF_{3}[/tex] + [tex]:NH_{3}[/tex] ⇒ F3[tex]F_{3} BNH_{3}[/tex]

In the structure obtained (see the Lewis structure in the drawing) the black dots correspond to the electrons of the non-shared pairs.  Because hydrogen has a single electron and a single orbital available to fill, it forms only a covalent bond represented by a long dash.   The same goes for boron and fluorine but in this case the fluorine has pairs of free electrons.

Explanation:

Lewis's structure is all that representation of covalent bonds within a molecule or an ion. In it, said bonds and electrons are represented by long dots or dashes, although most of the times the dots correspond to non-shared electrons and dashes to covalent bonds.

All existing compounds can be represented by Lewis structures, giving a first approximation of how the molecule or ions could be.

Answer:

4O₂ (g) + 1/2C₅H₁₂ (g) →  5/2CO₂ (g)  +  3H₂O (g)

4 would be the smallest possible integer for O₂

Explanation:

The balanced equation is this one:

8O₂ (g) + C₅H₁₂ (g) →  5CO₂ (g)  +  6H₂O (g)

If we divide stoichiometry /2 (the half) we can consider that we use, the smallest possible integers.

8/2O₂ (g) + 1/2C₅H₁₂ (g) →  5/2CO₂ (g)  +  6/2H₂O (g)

4O₂ (g) + 1/2C₅H₁₂ (g) →  5/2CO₂ (g)  +  3H₂O (g)

Final answer:

The correct coefficient for O₂ when balancing the combustion of pentane equation is 8, as it provides the required 16 oxygen atoms to balance the equation.

Explanation:

To balance the chemical equation for the combustion of pentane (C₅H₁₂), we will need to follow a systematic approach.

Write down the unbalanced equation: ? O₂(g) + ? C₅H₁₂(g) → ? CO₂(g) + ? H₂O(g)

Balance the carbons first: Since there are 5 carbons in pentane, we need 5 CO₂ molecules on the product side to balance the carbon atoms.

Balance the hydrogens second: Pentane has 12 hydrogen atoms, so we need 6 H₂O molecules to balance the hydrogen atoms since each H₂O has 2 hydrogen atoms.

Balance the oxygens last: There are now 10 oxygen atoms from the CO₂ and another 6 from the H₂O, making a total of 16 oxygen atoms on the product side. Since O₂ has 2 oxygen atoms, we need 8 O₂ molecules to balance the oxygen atoms.

The balanced equation becomes: 8 O₂(g) + C₅H₁₂(g) → 5 CO₂(g) + 6 H₂O(g)

The appropriate coefficient for O₂ when the equation is balanced using the smallest possible integers is 8.

Answer:

Hi

The high dipole moment of water and its ease in forming hydrogen bonds make it an excellent analysis. A molecule is soluble in water if it can interact with its molecules through hydrogen bonds or ion-dipole interactions.

With anions that have oxygen they can form hydrogen bonds, since oxygen acts as their acceptor. The attraction of the anion on the water dipole must be taken into account. The same goes for Cl-F, which have solitary electron pairs and can act as hydrogen bridge acceptors. On the other hand, cations such as Na+, K+, Ca++ or Mg++ are surrounded by water molecules to which they are joined by dipole ion interactions while oxygen atoms are oriented towards the catión.

Explanation:

Final answer:

At equilibrium for the reaction NH₄HS(s) ⇌ NH₃(g) + H₂S(g) with Kc = 1.6 x 10²⁴, nearly all NH₄HS solid reacts, and the equilibrium concentrations of NH₃(g) and H₂S(g) in the vessel are both approximately 0.200 M.

Explanation:

When solid NH₄HS and 0.400 mol NH₃(g) are placed in a 2.0L vessel at 24°C, the system reaches equilibrium with the reaction NH₄HS(s) ⇌ NH₃(g) + H₂S(g), where Kc = 1.6 x 10²⁴.

Since solids do not appear in the equilibrium constant expression, we only consider the gaseous substances. Given the very large Kc, we can assume that the reaction strongly favors the products, meaning NH₃ and H₂S will be formed until NH₄HS is almost entirely consumed.

To determine the equilibrium concentrations, let's designate 'x' as the amount of NH₄HS that dissociates into NH₃ and H2S. At equilibrium, the concentration of NH₃ will be (0.400 - x) / 2.0 and of H2S it will be x / 2.0. The Kc expression is [NH₃][H₂S] = 1.6 x 1024. When we 'solve for x,' we find that x is essentially 0.400 mol, meaning nearly all added NH3 will convert to H2S. Thus, the equilibrium concentrations are both approximately 0.200 M, as the NH₄HS solid is limiting. Detailed calculations would require quadratic equation solving due to the high Kc, but the approximate values are suitable given the high Kc value.

Answer: add the acid to the water

Explanation:

Explanation:

I won't give you the answers. It won't help you in the long run. Instead, let's look at it logically:

You have two of something and you're gonna turn it into something else. That thing doesn't just disappear, it has to stay there. You can't act as if there's only one of them in the end result, that doesn't make sense.

Balancing chemical equations is about finding the ratios at which things occur. In the first example,

N2 + F2 -> NF3

You have two N on the left, one on the right. Better double the one on the right so you have equal amounts.

N2 + F2 -> 2NF3

Now, since there are two Ns on each side, there must be 6 Fs on the right (2×3). You only have 2 on the left side, so the next question is: how do I get from 2 to 6?

Simple! Multiply by 3:

N2 + 3F2 -> 2NF3

Let's check left side vs right side to see if we're right:

Left:

2 N

6 F (3×2)

Right:

2 N

6 F (2×3)

Left side = Right side, so that's the right answer.

Don't let questions like these stress you out. Just balance out the numbers so that there's the same amount of stuff on each side.

Answer:

D. a scientific explanation that is agreed on by all scientists and is no longer adjusted as new evidence is found

Explanation:

Scientific theory is an explanation that has been repeatedly tested and verified in accordance with the scientific method, using accepted protocols of observation, measurement, and evaluation of results

Answer:

"B"an explanation for something that is frequently adjusted as evidence is collected

The question is incomplete, here is the complete question:

Suppose 0.829 g of zinc chloride is dissolved in 100. mL of a 0.60 M aqueous solution of potassium carbonate. Calculate the final molarity of chloride anion in the solution. You can assume the volume of the solution doesn't change when the zinc chloride is dissolved in it. Round your answer to 2 significant digits.

Answer: The final molarity of chloride ion in the solution is 0.12 M

Explanation:

To calculate the number of moles for given molarity, we use the equation:

[tex]\text{Molarity of the solution}=\frac{\text{Moles of solute}\times 1000}{\text{Volume of solution (in mL)}}[/tex]     .....(1)

Molarity of potassium carbonate solution = 0.60 M

Volume of solution = 100. mL

Putting values in equation 1, we get:

[tex]0.60M=\frac{\text{Moles of potassium carbonate}\times 1000}{100}\\\\\text{Moles of potassium carbonate}=\frac{(0.60\times 100)}{1000}=0.06mol[/tex]

To calculate the number of moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]

Given mass of zinc chloride = 0.829 g

Molar mass of zinc chloride = 136.3 g/mol

Putting values in above equation, we get:

[tex]\text{Moles of zinc chloride}=\frac{0.829g}{136.3g/mol}=0.0061mol[/tex]

The chemical equation for the reaction of potassium carbonate and zinc chloride follows:

[tex]ZnCl_2+K_2CO_3\rightarrow ZnCO_3+2K^+(aq.)+2Cl^-(aq.)[/tex]

By stoichiometry of the reaction:

1 mole of zinc chloride reacts with 1 mole of potassium carbonate

So, 0.0061 moles of zinc chloride will react with = [tex]\frac{1}{1}\times 0.0061=0.0061mol[/tex] of potassium carbonate

As, given amount of potassium carbonate is more than the required amount. So, it is considered as an excess reagent.

Thus, zinc chloride is considered as a limiting reagent because it limits the formation of product.

By Stoichiometry of the reaction:

1 mole of zinc chloride produces 2 moles of chloride ion

So, 0.0061 moles of zinc chloride will produce = [tex]\frac{2}{1}\times 0.0061=0.0122mol[/tex] of acetate ion

Now, calculating the molarity of chloride ions in the solution by using equation 1:

Moles of chloride ion = 0.0122 moles

Volume of solution = 100. mL

Putting values in equation 1, we get:

[tex]\text{Molarity of chloride ions}=\frac{0.0122\times 1000}{100}\\\\\text{Molarity of chloride ions}=0.12M[/tex]

Hence, the final molarity of chloride ion in the solution is 0.12 M

The problem can be solved by converting the mass of zinc chloride into moles and then using the concept of molarity, which is defined as moles of solute per litre of solution. Calculating the molarity of the zinc ions involves dividing the calculated moles by the volume of the solution.

This problem can be solved using the concept of molarity, by which the concentration of a solution is determined. Molarity (M) is defined as moles of solute divided by liters of solution. As you've mentioned the mass of zinc chloride, the first step is to convert the mass of zinc chloride into moles. Zinc chloride (ZnCl2) has a molar mass of approximately 136.29 g/mol. Hence, moles of ZnCl2 = mass/molar mass. Calculating the moles gives us the moles of zinc ions, as each mole of ZnCl2 provides one mole of Zn2+ ions. After finding the moles of Zn, we find the molarity by dividing the moles of Zn by the volume of the solution in liters.

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Answer: D. MIXTURE

Explanation:

It’s important, you first understand the meaning of a pure substance, an element, a compound and a mixture.

A pure substance is a material with a particular composition and consists of only one type of atom or compound. An example is pure sugar.

An element is a substance that cannot be broken down chemically and elements have just one symbol from the periodic table such as Carbon (C), Hydrogen (H).

A compound consists of two or more elements that are bonded chemically. For example, ammonia is a compound with a chemical formula NH3 which means it is means it is made up of 3 moles of Hydrogen and 1 mole of nitrogen.

A mixture contains two or more elements or compounds that are not bonded chemically. It can homogenous or heterogeneous. Examples are salt solution, sand, vinegar.

Vinegar is a mixture of two compounds water and acetic acid and can be separated by physical means because no chemical bond exists between water and acetic acid.

Vinegar is best classified as a mixture because it consists of two different molecules - water and acetic acid - that are not chemically bonded, fitting the criteria of a mixture over an element, compound, or pure substance.

Vinegar is composed of approximately 5% acetic acid and 95% water. Which classification best fits vinegar? The correct choice is D. mixture. Vinegar is a mixture because it contains more than one kind of molecule - in this case, water (H2O) and acetic acid (CH3COOH) - combined in such a way that they can be physically separated. The components of a mixture are not chemically combined, which distinguishes mixtures from compounds. Elements consist of a single type of atom, and pure substances are made of only one type of molecule, thus excluding vinegar from being classified as an element or a pure substance. Therefore, vinegar's composition fits the definition of a mixture.

Final answer:

The contact force is caused by the charged particles that make up one atom pushing or pulling on the charged particles that make up other atoms. This is option B.

Explanation:

The contact force is caused by the charged particles that make up one atom pushing or pulling on the charged particles that make up other atoms.

This is option B.

When two objects are in contact, such as when you push against a wall or walk on the ground, the atoms in your body and the atoms in the object you are in contact with exert electromagnetic forces on each other, resulting in the contact force.

The other options, A, C, D, and E, do not accurately describe the cause of the contact force.

The temperature of the water increases when an alloy is added due to heat transfer from the hot alloy to the cooler water, causing water particles' kinetic energy to increase. Also, water has a higher specific heat than metals, so it absorbs more heat, further increasing its temperature. Both the higher kinetic energy and absorption of heat contribute to the rise in water temperature.

The increase in the temperature of water when an alloy is added can be understood in the context of the heat transfer process and changes in particle motion. At the particulate level, when the alloy sample is added to the water, there is a transfer of thermal energy from the alloy which is at a high temperature, to the water, which has a lower temperature. This takes place until both the water and the alloy reach equilibrium temperatures.

The heat transfer process causes the particles of water to start vibrating rapidly, thereby increasing their average kinetic energy. This increase in kinetic energy of the water particles manifests as an increase in its temperature. This occurrence is based on the principle that an increase in thermal energy in a sample of matter, with no phase change or chemical reaction involved, will result in an increase in its temperature.

Specific heat plays a significant role in this process. Water has a higher specific heat than most metals. This means it takes more energy to increase the temperature of water than it does to increase the temperature of the alloy. Therefore, when an alloy (or any object with low specific heat) at high temperature is added to water, the water absorbs more heat, which leads to an increase in temperature.

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The temperature of the water increases after the alloy sample is added due to the transfer of kinetic energy from the atoms in the alloy to the water molecules.

When the alloy sample is added to the water, the alloy is typically at a higher temperature than the water. At the particulate level, this means that the atoms within the alloy are moving with greater kinetic energy than the water molecules. The kinetic energy of particles is directly related to temperature; higher kinetic energy corresponds to a higher temperature.

As the alloy and water systems come into contact, collisions occur between the energetic alloy atoms and the less energetic water molecules. During these collisions, kinetic energy is transferred from the alloy atoms to the water molecules. This energy transfer results in an increase in the average kinetic energy of the water molecules, which manifests as an increase in the water's temperature.

 This process continues until thermal equilibrium is reached, meaning that the alloy and the water reach the same temperature. At this point, the average kinetic energy of the alloy atoms and the water molecules is equalized, and there is no further net transfer of energy between the two. The overall effect is that the water's temperature has risen to a value between its initial temperature and the initial temperature of the alloy.

Answer:Elements of even atomic number and mass number are more stable than elements of odd atomic and mass numbers

Explanation: The fact that elements possessing even number of nucleons are more stable and abundant suggests that nucleons are paired in the nucleus. This even number of nucleons is commonly called a magic number because bit is associated with extra stability, abundance of elements and plenitude of isotopes of such elements.

These magic numbers are often numbers which are multiples of four.

Answer:

109.97JK-1

Explanation:

Entropy is the degree of disorderliness of a substance. It is given by ∆H/T where T is the absolute temperature in Kelvin.

Given ∆H= 38.6*10^3

T=78°C+ 273=351K

∆S=38.6*10^3/351=109.97JK-1 as shown the diagram.

Answer:

The volume of air at where the pressure and temperature are  52 kPa, -5.0 ºC is [tex] 3.64 m^3[/tex].

Explanation:

The combined gas equation is,

[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]

where,

[tex]P_1[/tex] = initial pressure of gas = 104 kPa

[tex]P_2[/tex] = final pressure of gas = 52 kPa

[tex]V_1[/tex] = initial volume of gas = [tex]2.0m^3[/tex]

[tex]V_2[/tex] = final volume of gas = ?

[tex]T_1[/tex] = initial temperature of gas = [tex]21.1^oC=273+21.1=294.1K[/tex]

[tex]T_2[/tex] = final temperature of gas = [tex]-5.0^oC=273+(-5.0)=268 K[/tex]

Now put all the given values in the above equation, we get:

[tex]\frac{104 kPa\times 2.0m^3}{294.1 K}=\frac{52 kPa\times V_2}{268 K}[/tex]

[tex]V_2=3.64 m^3[/tex]

The volume of air at where the pressure and temperature are  52 kPa, -5.0 ºC is [tex] 3.64 m^3[/tex].

The question pertains to how a mass of air's volume changes with altitude in the subject of Physics, using the ideal gas law which relates pressure, volume, and temperature. Actual calculation could not be completed due to the ambiguity in the question's phrasing.

The subject in question relates to Physics, specifically the concepts of gas laws and how changes in pressure, temperature, and volume affect gases. The question involves applying the ideal gas law to determine how the volume of a mass of air changes when altitude affects temperature and pressure.

If we consider the ideal gas law, which states that PV/T = constant for a given mass of air, and if we ignore the effect of humidity and assume the atmospheric air behaves as an ideal gas, we can relate the initial and final states of the mass of air by the equation (P1V1)/T1 = (P2V2)/T2. To find the new volume V2, rearrange the equation to V2 = (P1V1T2)/(P2T1). With all values, including pressures, volumes, and temperatures, it is necessary to convert temperatures to Kelvin before using the formula.

To compute the problem described, we would convert 21.1 ºC to Kelvin by adding 273.15, which is 294.25K, and similarly convert -5.0 ºC to Kelvin, which would give 268.15K. Then, we'd calculate the new volume V2 knowing P1, V1, T1, P2, and T2. However, since the question 'To what volume will the region expand when it has risen to altitude where the pressure and temperature are (a) 52 kPa, -5.0 ºC (True or False)' lacks a clear predicate and the expected answer format (True or False doesn't fit the question being asked), we cannot calculate V2 without additional information or rephrasing of the question.

Answer:

The answer to your question is a) catalyst

Explanation:

a) Catalyst.  A catalyst is a substance that speeds up a reaction but it is not consumed by the reaction.

b) Oxidizing agent.  It is a substance that reduces and can oxidize other substances.

c) Reducing agent.  It is a substance that oxidizes and can reduce other substances.

d) Antioxidant. It is a substance that prevent substances from oxidation.

Answer:

The coefficient of Al2O3 is 1

Explanation:

Step 1: Data given

The unbalanced equation: Cu + Al2O3 → Al + CuO

Step 2: Balancing the equation

On the left side we have 2x Al (in Al2O3) on the right side we have 1x Al. To balance the amount of Al, we have to multiply Al on the right side by 2

Cu + Al2O3 → 2Al + CuO

On the left side we have 3x O (in Al2O3), on the right side we have 1x O (in CuO). To balance the amount of O, we have to multiply CuO on the right side, by 3

Cu + Al2O3 → 2Al + 3CuO

On the right side we have 3x Cu (in 3CuO), on the left side we have 1x Cu. To balance the amount of Cu on both sides, we have to multiply Cu (on the left side) by 3.

Now the equation is balanced.

3Cu + Al2O3 → 2Al + 3CuO

The coefficient of Al2O3 is 1

Answer:

A. Electrochemical Cell

Explanation:

Hypertonic solutions have a higher solute concentration outside the cell than inside, causing water to move out of the cell and potentially causing the cell to shrink.

Solutions with a higher concentration of solutes than the concentration inside the cell are known as hypertonic solutions. The term hypertonic refers to having a greater concentration of solutes in the solution compared to the concentration inside the cell. When placed in such a solution, the net flow of water will be out of the cell, as water moves from an area of lower solute concentration to an area of higher solute concentration to achieve equilibrium. This can cause cells to shrink as they lose water. In contrast, isotonic solutions have the same solute concentration as the cell, while hypotonic solutions have a lower solute concentration, leading to water moving into the cell, which can cause it to swell and potentially burst.