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 iron filings. Which classification best describes the resulting mixture?

Accepted Answer

Heterogeneous mixture

Question 3

Which statement best describes 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

Oxygen gas

Question 5

A sample of seawater is analyzed and found to have the same composition throughout. Which classification best fits this sample?

Accepted Answer

Homogeneous mixture

Question 6

Which of the following best distinguishes a compound from a mixture?

Accepted Answer

A compound is made of elements chemically combined in a fixed ratio.

Question 7

A chemist heats 10.0 g of calcium carbonate and obtains 5.6 g of calcium oxide and 4.4 g of carbon dioxide. Which law does this experiment best illustrate?

Accepted Answer

Law of Conservation of Mass

Question 8

Which of the following is NOT a physical property?

Accepted Answer

Flammability

Question 9

Which scenario best demonstrates the Law of Definite Proportions?

Accepted Answer

Water from different sources always contains hydrogen and oxygen in a 2:1 ratio by atoms.

Question 10

A student observes that a metal turns black when left in air. This is an example of:

Accepted Answer

A chemical property

Question 11

Which of the following best describes air?

Accepted Answer

Homogeneous mixture

Question 12

Which of the following is a heterogeneous mixture?

Accepted Answer

Salad

Question 13

A sample of water is decomposed into hydrogen and oxygen gases. Which statement is correct?

Accepted Answer

Water is a compound that can be broken down by chemical means.

Question 14

Which of the following is an example of a homogeneous mixture used in medicine?

Accepted Answer

Saline solution

Question 15

Which property would you use to separate a mixture of iron filings and sulfur?

Accepted Answer

Magnetism

Question 16

A 10.0 g sample of magnesium reacts with 6.6 g of oxygen to form magnesium oxide. What is the mass of magnesium oxide formed?

Accepted Answer

16.6 g

Question 17

Which of the following best explains why rusting is considered a chemical change?

Accepted Answer

It produces a new substance with different properties.

Question 18

Which of the following statements is true regarding compounds?

Accepted Answer

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

Question 19

Which of the following is NOT a characteristic of a pure substance?

Accepted Answer

Can be separated by physical means

Question 20

A patient receives an intravenous (IV) solution of glucose dissolved in water. This solution is best classified as:

Accepted Answer

Homogeneous mixture

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

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