Q: Which of the following is a correct conversion factor for energy units?

$$1 \text{ calorie (cal)} = 4.184 \text{ joules (J)}$$

Q: Which of the following is the correct formula to calculate the amount of heat absorbed or released by a substance?

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

Question 1

Which of the following best describes a crystalline solid?

Accepted Answer

Atoms or molecules are arranged in a well-ordered, repeating three-dimensional structure.

Question 2

A student finds a shiny metal and wants to heat it as quickly as possible with a given amount of energy. Which property should the student look for in the metal?

Accepted Answer

A low specific heat capacity, so the temperature increases more for the same energy input.

Question 3

Which of the following is an example of a chemical property?

Accepted Answer

The flammability of gasoline.

Question 4

Which process is an example of an endothermic change?

Accepted Answer

Ice melting in a glass of water.

Question 5

A mixture of oil and water is classified as which type of mixture?

Accepted Answer

A heterogeneous mixture.

Question 6

Which of the following statements about the law of conservation of mass is correct?

Accepted Answer

The total mass of reactants equals the total mass of products in a chemical reaction.

Question 7

Which of the following best describes the difference between temperature and heat?

Accepted Answer

Temperature measures the average thermal energy of matter, while heat is the transfer of thermal energy due to a temperature difference.

Question 8

Which of the following is a correct conversion factor for energy units?

Accepted Answer

$$1 	ext{ calorie (cal)} = 4.184 	ext{ joules (J)}$$

Question 9

A 25 g sample of gold is heated from $$29.0^{\circ}C$ to 350.0$$^{\circ}$$C. If $$the specific heat capacity of gold is $$0.128 	ext{ J/g}^{\circ}C$$, how much heat is absorbed by the gold?

Accepted Answer

$$1,028 	ext{ J}$$

Question 10

Which of the following is a physical change?

Accepted Answer

Water boiling to form steam.

Question 11

Which of the following best describes a compound?

Accepted Answer

A pure substance composed of two or more elements in fixed, definite proportions.

Question 12

Which temperature is equivalent to $$25^{\circ}C$ in Kelvin?

Accepted Answer

$$298.15 	ext{ K}$$

Question 13

A chemical reaction absorbs $$1500 	ext{ J} of $$energy. Which term best describes this reaction?

Accepted Answer

Endothermic

Question 14

Which of the following is a homogeneous mixture?

Accepted Answer

Air

Question 15

Which of the following best explains why gases are compressible?

Accepted Answer

The atoms or molecules in a gas are far apart and not in contact with one another.

Question 16

Which of the following is the correct formula to calculate the amount of heat absorbed or released by a substance?

Accepted Answer

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

Question 17

A student dissolves salt in water and observes that the temperature of the solution decreases. What type of process is this?

Accepted Answer

Endothermic

Question 18

Which of the following statements about energy is correct?

Accepted Answer

Energy can be converted from one form to another, but cannot be created or destroyed.

Question 19

A 50.0 g sample of water absorbs $$2.09 	imes 10^3$ 	ext{ J} of $$heat. If the specific heat capacity of water is $$4.184 	ext{ J/g}^{\circ}C$$, what is the temperature change of the water?

Accepted Answer

$$10.0^{\circ}C$

Chapter 3: Matter and Energy – Study Notes for Introductory Chemistry

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