Question 1

Which of the following best describes a scientific law?

Accepted Answer

A brief summary statement of many past observations that allows for the prediction of future observations.

Question 2

According to the law of conservation of mass, which equation correctly represents a chemical reaction where 10 g of reactants produce 10 g of products?

Accepted Answer

$$m_{reactants} = m_{products}$$

Question 3

Which statement about a hypothesis is correct?

Accepted Answer

A hypothesis is a proposed explanation of a phenomenon based on the provided evidence.

Question 4

A student observes that a metal object sinks in water. Which step of the scientific method does this represent?

Accepted Answer

Observation of a natural phenomenon

Question 5

Which of the following is NOT a requirement for something to be considered matter?

Accepted Answer

It must be visible to the naked eye.

Question 6

Which of the following is an example of an intensive property?

Accepted Answer

Density

Question 7

A block has a mass of 200 g and a volume of 50 cm$$^3. $$What is its density?

Accepted Answer

$$4\ \mathrm{g/cm^3$}$$

Question 8

Which of the following best describes a scientific theory?

Accepted Answer

A well-established explanation of a phenomenon based on a series of facts and a body of evidence.

Question 9

If a chemical reaction starts with 15 g of reactants and produces 12 g of products, what can you conclude?

Accepted Answer

The law of conservation of mass has been violated.

Question 10

Which of the following is a real-world example of the law of gravity as a scientific law?

Accepted Answer

Objects with mass are attracted to one another, causing a ball thrown upwards to return to the ground.

Question 11

Which of the following statements about density is correct?

Accepted Answer

Density is the ratio of mass to volume.

Question 12

A scientist proposes that increasing temperature will increase the rate of a chemical reaction. What is this proposal called?

Accepted Answer

A hypothesis

Question 13

Which of the following is the correct formula for density?

Accepted Answer

$$d = \frac{m}{V}$$

Question 14

Which of the following is a characteristic of a good hypothesis?

Accepted Answer

It does not need to contradict previous scientific theories.

Question 15

Which of the following is NOT a step in the scientific method?

Accepted Answer

Ignoring results that do not fit the hypothesis

Question 16

A collision theory is used to explain which of the following?

Accepted Answer

The results of testing hypotheses relating to the effects of changing temperature.

Question 17

Which of the following is true about chemicals?

Accepted Answer

Chemicals make up virtually everything you come into contact with.

Question 18

Which of the following best describes the role of scientific inquiry in chemistry?

Accepted Answer

It tries to understand how all matter behaves by studying the particles that compose matter.

Question 19

A student measures the mass and volume of a liquid and calculates its density. Which property is the student determining?

Accepted Answer

An intensive property

Question 20

Which of the following is the correct conversion between centimeters and meters?

Accepted Answer

$$100\ \mathrm{cm} = 1\ \mathrm{m}$$

Introduction to Chemistry: Scientific Method, Matter, and Density

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