Question 1

Which of the following best describes the classification of the substances shown in the four boxes (i–iv) in the first image?

Accepted Answer

i: element; ii: compound; iii: heterogeneous mixture; iv: homogeneous mixture

Question 2

In the context of the first image, which box (i–iv) represents a homogeneous mixture?

Accepted Answer

Box iv

Question 3

Based on the second image, which separation technique is being illustrated?

Accepted Answer

Filtration

Question 4

A student observes that after mixing two clear liquids, a solid forms and settles at the bottom. Which term best describes the solid formed?

Accepted Answer

Precipitate

Question 5

Which of the following statements is a hypothesis?

Accepted Answer

Mixing hexane and water will not form a solution because of the difference in polarity.

Question 6

Which of the following is NOT an observation?

Accepted Answer

Energy is converted from one form to another.

Question 7

Nitrous oxide, rainwater, silver, and salad are best classified as:

Accepted Answer

i: compound; ii: homogeneous mixture; iii: element; iv: heterogeneous mixture

Question 8

Which of the following best describes the process of removing dust and particulates from air using an air purifier, as shown in the second image?

Accepted Answer

Filtration

Question 9

A mixture of sand and salt is added to water and stirred. Which separation technique would best separate the sand from the saltwater solution?

Accepted Answer

Filtration

Question 10

Which of the following is a compound?

Accepted Answer

Nitrous oxide (N$$_2O)$$

Question 11

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture in which the composition is uniform throughout

Question 12

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

Accepted Answer

Salad

Question 13

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

Accepted Answer

Compounds are made up of two or more elements chemically combined in fixed proportions.

Question 14

A student claims that after mixing two unknown liquids and forming a solid and a new liquid, it is possible to determine if the reactants and products are elements or compounds. Is this correct?

Accepted Answer

No, because more information is needed to classify them as elements or compounds.

Question 15

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

Accepted Answer

A homogeneous mixture has a variable composition, while a compound has a fixed composition.

Classification of Matter & Separation Methods – General Chemistry Study Guidance

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