Question 1

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

Accepted Answer

Reactivity with acids

Question 2

A sample of brass is analyzed and found to have a uniform composition throughout. Based on this information, brass is best classified as:

Accepted Answer

A homogeneous mixture

Question 3

Which of the following statements 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 NOT a pure substance?

Accepted Answer

Air

Question 5

A student mixes sand and water in a beaker. Which of the following best describes the resulting mixture?

Accepted Answer

A heterogeneous mixture

Question 6

Which of the following can be separated into its components by physical means?

Accepted Answer

Salt water

Question 7

A chemist measures the boiling point of a liquid. This measurement is an example of:

Accepted Answer

A physical property

Question 8

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

Accepted Answer

It results in the formation of a new substance with different properties.

Question 9

A sealed container contains 10 g of hydrogen and 80 g of oxygen. After a reaction, water is formed. According to the law of conservation of mass, what is the total mass of water produced?

Accepted Answer

90 g

Question 10

Which of the following is a correct statement about compounds?

Accepted Answer

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

Question 11

A hospital stores oxygen gas for medical use. Which classification best fits oxygen gas?

Accepted Answer

Element

Question 12

Which of the following scenarios demonstrates the application of the law of conservation of mass in a real-world context?

Accepted Answer

A scientist finds that the total mass of reactants and products in a closed reaction vessel remains constant.

Question 13

Which of the following is a distinguishing feature of a homogeneous mixture?

Accepted Answer

It has uniform composition throughout.

Question 14

A student is given a clear, colorless liquid and told it is either pure water or salt water. Which property could be measured to help distinguish between the two?

Accepted Answer

Boiling point

Question 15

Which of the following best describes why air is classified as a mixture?

Accepted Answer

It consists of different substances physically combined.

Question 16

During a chemical reaction in a closed system, the mass of the system is measured before and after the reaction. Which result would support the law of conservation of mass?

Accepted Answer

The mass remains unchanged.

Question 17

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

Accepted Answer

Sand and water

Question 18

A sample of sodium chloride (NaCl) is heated and decomposes into sodium and chlorine gas. Which statement is true regarding this process?

Accepted Answer

It is a chemical change and the total mass remains constant.

Question 19

Which property would NOT be useful in distinguishing between a pure substance and a mixture?

Accepted Answer

Color

Question 20

A chemist is tasked with separating a mixture of iron filings and sulfur. Which method would be most appropriate and why?

Accepted Answer

Use a magnet, because the mixture can be separated by physical means.

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

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