Question 1

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

Accepted Answer

Reactivity of sodium with water

Question 2

A student mixes sand and salt in a beaker. Which classification best describes the resulting mixture?

Accepted Answer

Heterogeneous mixture

Question 3

Which statement best illustrates the Law of Conservation of Mass?

Accepted Answer

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

Question 4

Which of the following is a pure substance?

Accepted Answer

Sodium chloride (NaCl)

Question 5

A sample of matter has a uniform composition and can be separated into two elements by chemical means. How should it be classified?

Accepted Answer

Compound

Question 6

Which of the following best describes the difference between a physical and a chemical property?

Accepted Answer

Physical properties can be observed without changing the substance's chemical composition.

Question 7

During a laboratory experiment, 10.0 g of hydrogen reacts completely with 80.0 g of oxygen to form water. According to the Law of Conservation of Mass, what is the total mass of water produced?

Accepted Answer

90.0 g

Question 8

Which of the following is NOT a correct example of a homogeneous mixture?

Accepted Answer

Sand in water

Question 9

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 10

A chemist observes that a piece of iron left outside forms rust over time. Which property of iron is being demonstrated?

Accepted Answer

Chemical property

Question 11

Which of the following best describes the composition of a heterogeneous mixture?

Accepted Answer

Its components are not uniformly distributed.

Question 12

Which scenario best applies the Law of Conservation of Mass in a real-world context?

Accepted Answer

A sealed container with a chemical reaction inside shows no change in total mass before and after the reaction.

Question 13

Which of the following is a correct statement about mixtures?

Accepted Answer

Mixtures are physical combinations of substances where each retains its own properties.

Question 14

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

Accepted Answer

Dissolving sugar in water

Question 15

A student claims that when hydrogen and oxygen react to form water, the mass of water produced is less than the total mass of hydrogen and oxygen used. Which scientific law does this claim violate?

Accepted Answer

Law of Conservation of Mass

Question 16

Which of the following best describes an element?

Accepted Answer

A substance that cannot be broken down into simpler substances by chemical means.

Fundamental Concepts in General Chemistry: Properties, Classification of Matter, and Laws of Chemical Combination

Study Guide - Practice Questions

Study Guide - Flashcards