Q: Which of the following is the correct formula for calculating the amount of heat required to raise the temperature of a substance?

$$q = m \times SH \times \Delta T$$

Question 1

Which of the following best describes an intensive property of matter?

Accepted Answer

It does not depend on the amount of material present.

Question 2

A sample of sodium chloride is dissolved in water, forming a clear solution. This solution is best classified as:

Accepted Answer

A homogeneous mixture

Question 3

Which of the following is a chemical change?

Accepted Answer

Burning a piece of paper

Question 4

According to the Law of Definite Proportions, which statement is correct?

Accepted Answer

A pure compound always contains the same elements in the same proportion by mass.

Question 5

Which equation correctly converts a temperature from Celsius to Kelvin?

Accepted Answer

$$K = ^\circ C + 273.15$$

Question 6

A 10.0 g sample of copper at 25 $$^\circC $$has a final temperature of 100 $$^\circC $$when 289 J of heat are added. What is the specific heat of copper? (Use $$q = m 	imes SH 	imes \Delta T)$$

Accepted Answer

$$0.385 \ \mathrm{J/g\ ^\circ C}$$

Question 7

Which of the following statements about gases is correct?

Accepted Answer

Gaseous molecules are in constant random motion and occupy the entire volume of their container.

Question 8

A candy bar contains 350 Calories. How many joules does it contain? (1 Calorie = 4184 J)

Accepted Answer

$$1,225,200 \ \mathrm{J}$$

Question 9

Which of the following best explains why the boiling point of a liquid increases with increasing external pressure?

Accepted Answer

More energy is required for the vapor pressure to equal the higher external pressure.

Question 10

Which of the following is an example of an extensive property?

Accepted Answer

Mass

Question 11

A heating curve for water shows a flat line at 100 $$^\circC. $$What is happening to the water at this point?

Accepted Answer

Water is undergoing a phase change from liquid to gas (boiling).

Question 12

Which of the following best describes the difference between a compound and a mixture?

Accepted Answer

A compound is made of elements chemically bonded in fixed ratios, while a mixture is a physical combination of substances.

Question 13

Which of the following is the correct formula for calculating the amount of heat required to raise the temperature of a substance?

Accepted Answer

$$q = m 	imes SH 	imes \Delta T$$

Question 14

Which of the following is a physical property?

Accepted Answer

Melting point

Question 15

A sample of water is heated from 25 $$^\circC to 100$$ $$^\circC. $$Which of the following best describes the energy changes that occur?

Accepted Answer

Kinetic energy increases as the temperature rises.

Question 16

Which of the following best describes the process of vaporization?

Accepted Answer

The most energetic molecules in a liquid escape into the gas phase.

Question 17

If a recipe says to bake a cake at 487 K, what temperature in $$^\circF $$should you set your oven? (Use $$^\circ C = K - 273.15$$ and $$^\circ F = \frac{9}{5}(^\circ C) + 32)$$

Accepted Answer

$$414^\circ F$$

Question 18

Which of the following best describes the energy change during the melting of ice at 0 $$^\circC$$?

Accepted Answer

The added energy is used to overcome intermolecular forces without changing temperature.

Question 19

Which of the following is true about the distribution of kinetic energies in a sample of gas at two different temperatures?

Accepted Answer

At higher temperature, more molecules have higher kinetic energy.

Question 20

Which of the following best describes the Law of Conservation of Energy?

Accepted Answer

Energy can change forms, but cannot be created or destroyed.

Chapter 3: Matter and Energy – General Chemistry Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard