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If the temperature changes in a chemical reaction, What has occurred?


A.There was no energy transfer.

B.Energy was transferred

C.Energy was destroyed

D.Energy was created

Answer:Sequoia,Bristle pine

Explanation:

The weighted average atomic mass of copper is calculated using the abundances and atomic masses of its two isotopes, resulting in a value of 63.54 u to four significant figures.

To calculate the weighted average atomic mass of copper based on the given information about its isotopes, you would use the percentage abundances and atomic masses:

Weighted Average = (Fraction of Isotope 1 × Atomic Mass of Isotope 1) + (Fraction of Isotope 2 × Atomic Mass of Isotope 2)

For Copper-63:

For Copper-65:

Converting the percentages to decimal form:

The calculation would be:

(0.6917 × 62.94 u) + (0.3083 × 64.93 u) = 43.525698 u + 20.014779 u = 63.540477 u

Therefore, the weighted average atomic mass of copper to four significant figures is 63.54 u.

In angular unconformity, the older, eroded surface is tilted or folded.

Answer:

In angular unconformity, the older, eroded surface is tilted or folded.

Explanation:

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The answer is solution cap a.. n....s

Answer: The correct answer is Option D.

Explanation:

The general representation of an atom is given by: [tex]_Z^A\textrm{X}[/tex], where,

A = Mass number of the element

Z = Atomic number of the element

X = Symbol of the element

Atomic number is defined as the number of electrons or protons present in an atom.

Atomic number = Number of protons = Number of electrons

Mass number is defined as the sum of number of protons and number of neutrons in an element.

Mass Number = Number of protons + number of neutrons

From the given options:

Z = 34 = Number of protons

A = 79 = Number of neutrons + number of protons

Number of neutrons = 79 - 34 = 45

Z = 35 = Number of protons

A = 80 = Number of neutrons + number of protons

Number of neutrons = 80 - 35 = 45

Z = 32 = Number of protons

A = 73 = Number of neutrons + number of protons

Number of neutrons = 73 - 32 = 41

Z = 36 = Number of protons

A = 84 = Number of neutrons + number of protons

Number of neutrons = 84 - 36 = 48

From the above information, it is visible that Krypton has most neutrons.

Hence, the correct answer is Option D.

Answer: Option (b) is the correct answer.

Explanation:

A chemical reaction is defined as one which tends to bring change in composition of reactants leading to the formation of new substances or products.

So, when baking soda and vinegar come in contact with each other then they chemically combine to each other. This is because a gas is formed upon their reaction which shows it is a chemical reaction.

Thus, we can conclude that vinegar and baking soda react to form a new gaseous substance.

Answer:

A. When the forces are weaker, a substance will have higher volatility.

Explanation:

edge 2020

The combined mass of oxygen and mercury obtained from the thermal decomposition of 20g of mercury(II) oxide would also be 20g. The exact division between oxygen and mercury would depend on the stoichiometry of the reaction.

The subject here is the thermal decomposition of mercury(II) oxide (HgO). When this compound is heated, it decomposes into mercury and oxygen. The mass principle in chemistry, also known as the Conservation of Mass, states that the combined mass of the products (oxygen and mercury in this case) should be equal to the mass of the reactant (mercury oxide). Therefore, if you heat 20g of mercury(II) oxide, you would obtain a combined mass of 20g of oxygen and mercury. The exact mass of oxygen and mercury would depend on the atomic mass and stoichiometry of the decomposition reaction. For example, if the reaction were 2HgO --> 2Hg + O2, you would get twice as much mercury mass as oxygen, due to the nature of the balanced equation.

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Answer:

heavier than helium

Explanation:

In a fusion reaction between carbon and another element, a different element is formed, releasing neutrons. The reaction is exothermic and results in the formation of a helium nucleus and a neutron.

In the process of nuclear fusion, two nuclei are combined to form a larger nucleus. In this case, the fusion reaction is between carbon and another element, likely a heavier isotope of hydrogen. This process would yield a different element, largely determined by the specific fusion reactions taking place. For example, if carbon fuses with a deuteron (an isotope of hydrogen), the resulting element could be oxygen, neon, or magnesium depending on the exact conditions of the reaction. Furthermore, the reaction is exothermic, meaning some energy is released in the form of gamma radiation and other particles, with neutrons highlighted in this specific context.

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The heat required to melt the ice cube is calculated using the heat of fusion and the ice's mass. This heat is then used to calculate how much it lowers the temperature of the coffee using the formula for heat transfer. The result is an estimated final coffee temperature of 84.0 degrees Celsius.

Let's start by calculating the amount of heat (q) necessary to melt the ice. The formula to calculate the heat required to convert ice to water is q= m * Lf where m is the mass of the ice and Lf represents the heat of fusion for the ice, which is 6.0 kJ/mol. Given that the molar mass of water is ~18g/mol, we can calculate the number of moles of ice in the cube as 9.0g / 18 g/mol = 0.5 mol. Therefore, the heat required to melt the ice is q=0.5 mol * 6.0 kJ/mol = 3.0 kJ.

Next, we calculate how much this heat will lower the temperature of the coffee. The formula q = m * c * ΔT can be rearranged to solve for ΔT (the change in temperature) as ΔT = q / (m * c). Assuming the specific heat capacity (c) of coffee is the same as water (4.18 kJ/kg*K), the mass of the coffee is 120g = 0.12 kg, and plugging in the heat from the previous step, we get ΔT = 3.0 kJ / (0.12 kg * 4.18 kJ/kg*K) = 6.0 K. Therefore, the final temperature of the coffee after the ice has melted will be 90.0 degrees Celsius - 6.0 degrees Celsius = 84.0 degrees Celsius.

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Answer:

number of moles = 0.08175 moles

Explanation:

To solve this question, we will use the ideal gas law:

PV = nRT

where:

P is the pressure = 1 atm

V is the volume of the gas = 2 liters

n is the number of moles we want to find

R is the general gas constant = 0.0821 L-atm/mol-K

T is the temperature = 25°C = 25 + 273 = 298°K

Now, substitute with the givens in the equation to get n as follows:

PV = nRT

1 * 2 = n * 0.0821* 298

n = [tex] \frac{1*2}{0.0821 * 298} = 0.08175 [/tex] moles

Hope this helps :)

[tex]\boxed{{\text{0}}{\text{.06 mol}}}[/tex]  of nitrogen are contained in a 2 L cola bottle at atmospheric pressure and room temperature.

Further Explanation:

An ideal gas contains a large number of randomly moving particles that are supposed to have perfectly elastic collisions among themselves. It is just a theoretical concept, and practically no such gas exists. But gases tend to behave almost ideally at a higher temperature and lower pressure.

Ideal gas law is considered as the equation of state for any hypothetical gas. The expression for the ideal gas equation is as follows:

[tex]{\text{PV}} = {\text{nRT}}[/tex]                        ......(1)

Here, P is the pressure of nitrogen.

V is the volume of nitrogen.

T is the absolute temperature of nitrogen.

n is the number of moles of nitrogen.

R is the universal gas constant.

Rearrange equation (1) to calculate the number of moles of nitrogen.

[tex]{\text{n}} = \frac{{{\text{PV}}}}{{{\text{RT}}}}[/tex]            ......(2)

Firstly, the temperature is to be converted into K. The conversion factor for this is,

[tex]{\text{0 }}^\circ {\text{C}} = {\text{273 K}}[/tex]

So the temperature of nitrogen is calculated as follows:

[tex]\begin{aligned}{\text{Temperature}}\left( {\text{K}}\right)&=\left( {25 + 273} \right)\;{\text{K}}\\&=298\;{\text{K}}\\\end{aligned}[/tex]

The pressure of nitrogen is 1 atm.

The volume of nitrogen is 2 L.

The temperature of nitrogen is 298 K.

Universal gas constant is 0.0821 L atm/K mol.

Substitute these values in equation (2).

[tex]\begin{aligned}{\text{n}}&=\frac{{\left({{\text{1 atm}}}\right)\left({{\text{2 L}}}\right)}}{{\left({{\text{0}}{\text{.0821 L atm/K mol}}}\right)\left({{\text{298 K}}} \right)}}\\&={\text{0}}{\text{.0817 mol}}\\&\approx {\text{0}}{\text{.08 mol}}\\\end{aligned}[/tex]

As we know, air contains 78 % of nitrogen. So the moles of nitrogen are calculated as follows:

[tex]\begin{aligned}{\text{Number of moles of }}{{\text{N}}_2} &=\left({{\text{0}}{\text{.08 mol}}}\right)\left({\frac{{{\text{78}}\;{\text{\% }}}}{{{\text{100}}\,{\text{\% }}}}}\right)\\&={\text{0}}{\text{.0624 mol}}\\&\approx {\mathbf{0}}{\mathbf{.06 mol}}\\\end{aligned}[/tex]

Learn more:

1. Which statement is true for Boyle’s law: https://brainly.com/question/1158880

2. Calculation of volume of gas: https://brainly.com/question/3636135

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Ideal gas equation

Keywords: ideal gas, pressure, volume, absolute temperature, equation of state, hypothetical, universal gas constant, moles of gas, initial, final, moles of nitrogen, 0.08 mol, 0.06 mol, 298 K, 273 K, P, V, n, R, T, room temperature, atmospheric pressure.

The statement is false as gas particles are separated by large distances, move randomly, have no definite shape or volume, and can expand to fill their container.

The statement is FALSE. In the gas state, the particles are not packed closely together; rather, they are separated by large distances compared to their sizes. Gas particles have enough energy to overcome intermolecular interactions, allowing them to move about randomly and occupy all the accessible volume within a container. These particles are in constant motion, colliding elastically with each other and the walls of the container, and this motion becomes more rapid as the temperature increases. Gases have no definite shape or volume, and thus expand to fill the container they are in, contrasting the behavior of solids and liquids, where particles are more closely packed together.

Final answer:

Distilled water is neutral because it dissociates into equal numbers of hydronium ions and hydroxide ions, balancing its acidic and basic properties, resulting in a pH of 7.

Explanation:

Distilled water is considered to be neutral. This neutrality comes from the fact that in distilled water, a very small fraction of water molecules naturally dissociate into equal numbers of hydronium ions (H3O+) and hydroxide ions (OH−), creating an equal balance between acidic and basic properties. According to the Brønsted-Lowry definition, a substance that can donate a proton (as water does when forming H3O+) is an acid, and a substance that can accept a proton (as water does when forming OH−) is a base. Since water can do both, it acts as both an acid and a base, depending on the context. However, with no solutes to alter this balance, distilled water remains neutral with a pH of 7, meaning it is neither acidic nor basic.

The percent composition of calcium acetate (Ca(C2H3O2)2) is 25%, 7%, 0.6% and 10.12%.

To determine the percent composition of calcium acetate, we would have to calculate the content of the compound. This would mean determining the percent presence of calcium, carbon, hydrogen nd oxygen. This can be done as follows:

First, determine molar mass

% = molar mass of elements / total molecular molar mass) x100

M (Ca(C2H3O2)2) = 2*(12*2 +3*1+16*2) + 40=158

Now determine percent composition

%Ca= 40/158x 100

= 0.25x 100

= 25%

%C = 12/158  x 100

= 0.07x 100=7%

%H= 1/158x 100=

0.006x 100

=0.6%

%O=16/158x 100

= 0.101x 100=  10.12%

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Radical chlorination of pentane and neopentane results in different yields of the desired products due to the selectivity of the reaction. With neopentane, the reaction is very selective, producing a higher yield of neopentyl chloride, while with pentane, the reaction isn't selective, leading to various isomers and a lower yield of 1-chloropentane.

Radical chlorination of pentane isn't an efficient method to prepare 1-chloropentane because it doesn't give a high yield of the desired product. This is due to it being a non-selective process, leading to the formation of several isomeric products. In the case of pentane, several different hydrogens can be replaced creating many possible isomers of chloropentane.

On the other hand, radical chlorination of neopentane or (CH3)4C is a good way to prepare neopentyl chloride or (CH3)3CCH2Cl. This is because neopentane has a far greater proportion of equivalent tertiary hydrogens. When chlorination occurs, it's most likely to happen at these sites, producing a higher yield of the desired neopentyl chloride product with less chance of isomer formation.

This difference is due to the selectivity and specificity of the radical chlorination reaction on neopentane versus pentane. Radical chlorination is not very selective with pentane but is quite selective with neopentane due to the type of hydrogens present, thus making it a more ideal reaction.

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The correct statement is that best describes the relationship between volume of gas and mole is [tex]\boxed{{\text{The volume of gas is directly proportional to amount (moles)of gas }}}[/tex].

Further explanation:

Ideal gas:

An ideal gas contains a large number of randomly moving particles that are supposed to have perfectly elastic collisions among themselves. It is just a theoretical concept, and practically no such gas exists. But gases tend to behave almost ideally at a higher temperature and lower pressure.

The expression for the ideal gas equation of gas is as follows:

[tex]{\text{PV}}={\text{nRT}}[/tex]                                           ...... (1)

Here,

P is the pressure of the gas.

V is the volume of gas.

n denotes the number of moles of gas.

R is the gas constant.

T is the temperature of gas.

Rearrange equation (1) for V and we get,

[tex]{\text{V}}=\dfrac{{{\text{nRT}}}}{{\text{P}}}[/tex]                  ...... (2)

When the pressure (P) and temperature (T) of gas are constant and gas constant is also a consant. So the equation (2) can be modified so that all the constant can be replaced by K.

Substitute K for [tex]\dfrac{{{\text{RT}}}}{{\text{P}}}[/tex] in equation (2) and we get,  

[tex]{\text{V}}={\text{nK}}[/tex]                                                   ...... (3)

As K is constant in equation (3) it can also be written as:

[tex]{\text{V}}\propto{\text{n}}[/tex]                                          ...... (4)

According to equation (4), volume of gas is directly proportional to number of moles of gas at constant temperature and pressure.

Avogadro’s law:

Avogadro’s law is an experimental gas law that relates the volume of gas and number of moles of gas. It states that volume of an ideal gas is directly proportional to number of moles of an ideal gas at constant temperature and pressure.

The given plot also shows that volume of gas and number of moles at constant temperature and pressure is straight line. Therefore volume of gas increases with increase in number of moles of gas.

Hence, the correct statement is the volume of gas is directly proportional to amount (moles) of gas.

Learn more:

1. How many moles of nitrogen are present: https://brainly.com/question/2385746.

2.Calculate number of moles of Cl atom: https://brainly.com/question/1537871.

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Ideal gas equation

Keywords: ideal gas, pressure, volume, absolute temperature, equation of state, hypothetical, universal gas constant, moles of gas, initial, final, P, R, T, V, n.

If your in Connections Academy these would be the atoms and elements unit test:

1) c.

2) a.

3) b.

4) d.

5) a.

6) c.

7) a.

8) b.

9) b.

10) d.

11) d.

12) c.

13) c.

14) c.

15) a.

16) d.

17) c.

18) c.

19) c.

20) d.

21) c.

22) d.

23) 6 protons, 6 electrons and 7 neutrons

The rest your on your own. Hope this helps ;)

The postulate of the theory that has been a tenet and revised has been the consideration of the atom to the invisible particle. Thus, option A is correct.

Dalton's atomic theory has been the accepted theory and has been used for the determination of the structure of the atom. According to Dalton's theory, the atoms have consisted of the positively charged nucleus with the negative charge electrons revolving around it.

Dalton's theory conclude the atom to be a tiny particle, that can neither be created nor destroyed. The same element has been consisted of the same atoms.

The postulate of the theory that has been a tenet and revised has been the consideration of the atom to the invisible particle. Thus, option A is correct.

For more information about Dalton's atomic theory, refer to the link:

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