Question 1

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture in which the composition is uniform throughout and the different parts are not visible.

Question 2

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

Accepted Answer

Copper reacting with oxygen to form copper oxide.

Question 3

A sample of brass is made by mixing copper and zinc. Which classification best fits brass?

Accepted Answer

Homogeneous mixture

Question 4

Which of the following statements about pure substances is correct?

Accepted Answer

They have a fixed or definite composition.

Question 5

Calculate the specific heat ($$SH) of a $$metal if $$24.8\ \mathrm{g} of $$the metal absorbs $$275\ \mathrm{J} of $$energy and its temperature increases from $$20.2^{\circ}$$\mathrm{C}$$ to 24.5$$^{\circ}$$\mathrm{C}.

$$Use the formula:
$$
SH = \frac{q}{m 	imes \Delta T}
$$
where $$q is $$heat (J), $$m is $$mass (g), and $$\Delta T is $$the temperature change ($$^{\circ}\mathrm{C}).$$

Accepted Answer

$$SH = 2.98\ \mathrm{J}/\mathrm{g}^{\circ}\mathrm{C}$$

Question 6

Which of the following is NOT a physical property?

Accepted Answer

Ability to rust

Question 7

A glass of water with ice cubes floating in it is an example of which type of mixture?

Accepted Answer

Heterogeneous mixture

Question 8

Which process describes the direct change from a solid to a gas without passing through the liquid state?

Accepted Answer

Sublimation

Question 9

Which of the following best describes the particles in a solid?

Accepted Answer

They are close together and vibrate in fixed positions.

Question 10

A $$255\ \mathrm{g}$$ sample of copper is heated from $$24^{\circ}$$\mathrm{C}$$ to 185$$^{\circ}$$\mathrm{C}. If $$the specific heat of copper is $$0.385\ \mathrm{J}/\mathrm{g}^{\circ}\mathrm{C}$$, how much energy (in kJ) is required?

Use the formula:
$$
q = m 	imes SH 	imes \Delta T
$$
where $$q is $$heat (J), $$m is $$mass (g), $$SH is $$specific heat, and $$\Delta T is $$the temperature change ($$^{\circ}\mathrm{C}).$$

Accepted Answer

$$q = 15.8\ \mathrm{kJ}$$

Question 11

Which of the following is a chemical property?

Accepted Answer

Ability to react with acid

Question 12

Which of the following changes is a physical change?

Accepted Answer

Ice melting on the street

Question 13

Which of the following statements about compounds is correct?

Accepted Answer

They are composed of two or more elements chemically combined in a fixed ratio.

Question 14

During which process does water vapor lose energy and become liquid water?

Accepted Answer

Condensation

Question 15

Which of the following best describes a plateau (horizontal line) on a heating curve?

Accepted Answer

A change of state

Question 16

Which of the following is an example of a heterogeneous mixture?

Accepted Answer

Peach pie

Question 17

Which of the following is a pure substance?

Accepted Answer

Aluminum foil

Question 18

Which of the following is true about gases?

Accepted Answer

They have an indefinite shape and volume.

Question 19

Which of the following is an example of a physical property of copper?

Accepted Answer

It is a good conductor of electricity.

Question 20

Which of the following best describes the process of deposition?

Accepted Answer

A gas changing directly to a solid

Matter and Energy: Classification, Properties, and Changes

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