Q: Which equation correctly relates heat ($$q$$), mass ($$m$$), specific heat ($$c$$), and temperature change ($$\Delta T$$)?

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

Question 1

Which of the following best describes a compound?

Accepted Answer

A substance composed of two or more elements chemically combined in a fixed ratio.

Question 2

Which of the following is an example of a physical change?

Accepted Answer

Melting ice at $$0^\circ \mathrm{C}.$$

Question 3

A student mixes salt and water to make a solution. Which classification best describes the resulting mixture?

Accepted Answer

Homogeneous mixture

Question 4

Which of the following statements about the states of matter is correct?

Accepted Answer

Solids have a definite shape and volume.

Question 5

Which of the following is a chemical property?

Accepted Answer

Propane burns in air.

Question 6

Which of the following best illustrates the Law of Conservation of Mass?

Accepted Answer

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

Question 7

Which of the following is an example of an exothermic process?

Accepted Answer

Burning wood

Question 8

A sample of water is heated from $$29.0^\circ \mathrm{C} to$$ $$46.0^\circ \mathrm{C}. If $$the mass of water is $$7.40\ \mathrm{g}$$ and the specific heat is $$4.184\ \mathrm{J}/\mathrm{g}\cdot^\circ \mathrm{C}$$, how much heat is absorbed?

Accepted Answer

$$526\ \mathrm{J}$$

Question 9

Which of the following is NOT a method for separating mixtures?

Accepted Answer

Electrolysis

Question 10

If normal body temperature is $$98.6^\circ \mathrm{F}$$, what is this temperature in Kelvin?

Accepted Answer

$$310.2\ \mathrm{K}$$

Question 11

Which of the following best describes potential energy?

Accepted Answer

Energy stored due to position or composition

Question 12

Which of the following is a heterogeneous mixture?

Accepted Answer

Coffee with visible grounds

Question 13

Which equation correctly relates heat ($$q$$), mass ($$m$$), specific heat ($$c$$), and temperature change ($$\Delta T$$)?

Accepted Answer

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

Question 14

Which of the following is a pure substance?

Accepted Answer

Chlorine gas

Question 15

Which of the following is the correct conversion of $$60.1\ \mathrm{cal} to $$joules ($$\mathrm{J}$$)? (Given: $$1\ \mathrm{cal} = 4.184\ \mathrm{J})$$

Accepted Answer

$$251.6\ \mathrm{J}$$

Question 16

Which of the following best describes the First Law of Thermodynamics?

Accepted Answer

Energy cannot be created or destroyed, only transformed.

Question 17

A $$25.0\ \mathrm{g}$$ sample of water at $$45.0^\circ \mathrm{C}$$ absorbs $$455\ \mathrm{J} of $$heat. What is the final temperature of the water? (Specific heat of water = $$4.184\ \mathrm{J}/\mathrm{g}\cdot^\circ \mathrm{C})$$

Accepted Answer

$$49.3^\circ \mathrm{C}$$

Question 18

Which of the following is NOT a physical property?

Accepted Answer

Ability to burn in air

Question 19

Which temperature scale does NOT have negative values?

Accepted Answer

Kelvin

Question 20

Which of the following is a chemical change?

Accepted Answer

Hard boiling an egg

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