Question 1

Which of the following best describes brass, an alloy of copper and zinc, as shown in the image?

Accepted Answer

A homogeneous mixture

Question 2

A student filters orange juice with pulp using a funnel and filter paper, as shown in the image. What type of mixture is being separated?

Accepted Answer

A heterogeneous mixture

Question 3

Which of the following is an example of a pure substance?

Accepted Answer

Water (H$$_2O)$$

Question 4

A can is made of aluminum. At the atomic level, what does this indicate about the can?

Accepted Answer

It is a pure substance consisting of only aluminum atoms.

Question 5

Which process is represented by the transition from solid ice to liquid water as shown in the diagram?

Accepted Answer

Melting

Question 6

What is the correct equation to convert a temperature from Celsius to Fahrenheit?

Accepted Answer

$$T_F = 1.8(T_C) + 32$$

Question 7

A sample of water is heated from $$-10^\circC to$$ $$110^\circC. $$Which phase changes occur during this process?

Accepted Answer

Melting and boiling

Question 8

Which of the following foods is a heterogeneous mixture?

Accepted Answer

A taco

Question 9

If the temperature of a substance increases by $$10^\circC$$, which material will absorb the most heat per gram, based on the specific heat values provided?

Accepted Answer

Water ($$c = 1.00$$ cal/g$$^\circC)$$

Question 10

Which of the following best describes the process of condensation?

Accepted Answer

A gas changes to a liquid as heat is removed.

Question 11

A scientist wants to separate a mixture of sand and salt. Which method would be most effective?

Accepted Answer

Filtration

Question 12

Which of the following statements about elements and compounds is correct?

Accepted Answer

Elements are pure substances that cannot be broken down by chemical means.

Question 13

A sample of water at $$0^\circC is $$heated until it becomes steam at $$120^\circC. $$Which of the following best describes the energy changes during this process?

Accepted Answer

Energy is absorbed during both melting and boiling.

Question 14

Which of the following is a physical change?

Accepted Answer

Melting of ice

Question 15

Which temperature is equivalent to $$0^\circC in $$Kelvin?

Accepted Answer

$$273 K$$

Question 16

A food sample is burned in a calorimeter, causing the temperature of the surrounding water to rise. What type of energy is being measured?

Accepted Answer

Heat energy (calorimetry)

Question 17

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

Accepted Answer

Homogeneous mixtures have uniform composition throughout; heterogeneous mixtures do not.

Question 18

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

Accepted Answer

Burning a candle

Question 19

If a sample of water at $$25^\circC $$absorbs $$4184 J of $$heat, what is the mass of the water? (Specific heat of water is $$4.184 J/g$^\circC$$, temperature change is $$25^\circC)$$

Accepted Answer

$$4 g$$

Question 20

Which of the following best describes the process of sublimation?

Accepted Answer

A solid changes directly to a gas without becoming a liquid.

Matter, Mixtures, and Energy: Foundations of Chemistry

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