Question 1

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

Accepted Answer

Melting point

Question 2

A student measures the mass and volume of a metal sample to calculate its density. Which type of property is the student investigating, and why?

Accepted Answer

Physical property, because density can be measured without changing the substance

Question 3

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture with uniform composition throughout, like saltwater

Question 4

Which statement correctly distinguishes between an element and a compound?

Accepted Answer

Elements consist of only one type of atom, while compounds contain two or more elements chemically combined

Question 5

A sample of sand in water is best classified as which type of matter?

Accepted Answer

Heterogeneous mixture

Question 6

Which of the following scenarios best illustrates the law of conservation of mass?

Accepted Answer

Hydrogen and oxygen gases react to form water, and the total mass before and after the reaction remains the same

Question 7

Which of the following is NOT a chemical property?

Accepted Answer

Boiling point

Question 8

A chemist separates a mixture of sand and salt by adding water, filtering, and then evaporating the water. What does this process demonstrate about mixtures?

Accepted Answer

Mixtures can be separated by physical means

Question 9

Which of the following best explains why measuring the boiling point of a liquid does not change its chemical composition?

Accepted Answer

Boiling point is a physical property, so the substance's identity remains unchanged

Question 10

A student claims that when wood burns, the mass of the ash is less than the original wood, so mass is lost. Using the law of conservation of mass, how would you evaluate this claim?

Accepted Answer

The claim is incorrect because the total mass includes the gases released during burning

Question 11

Which of the following is a correct classification for sodium chloride (table salt)?

Accepted Answer

Compound

Question 12

Which property would you use to distinguish between a physical and a chemical change?

Accepted Answer

Whether the substance's chemical identity changes

Question 13

A solution of sugar dissolved in water is best described as:

Accepted Answer

A homogeneous mixture

Question 14

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

Accepted Answer

Compounds have fixed composition, mixtures have variable composition

Question 15

During a chemical reaction, 10 g of substance A reacts with 15 g of substance B to form compound C. According to the law of conservation of mass, what is the mass of compound C formed?

Accepted Answer

25 g

Question 16

Which of the following is an example of a process that involves a chemical property?

Accepted Answer

Iron rusting when exposed to oxygen

Question 17

A sample of pure copper is classified as which of the following?

Accepted Answer

Element

Question 18

Which of the following best describes the process of balancing a chemical equation?

Accepted Answer

Ensuring the total mass of reactants equals the total mass of products

Question 19

A student mixes oil and water in a beaker. After a few minutes, two distinct layers form. Which statement best explains this observation?

Accepted Answer

Oil and water form a heterogeneous mixture

Question 20

Which of the following is a correct statement about pure substances?

Accepted Answer

Pure substances have fixed composition and distinct properties

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

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