Question 1

Which of the following best describes the scientific method as used in chemistry?

Accepted Answer

A systematic process involving observation, hypothesis, experimentation, and analysis to understand the world.

Question 2

Matter is defined as:

Accepted Answer

Anything that has mass and takes up space.

Question 3

Which of the following is NOT considered matter?

Accepted Answer

Light

Question 4

A pure substance that cannot be broken down further by chemical means is called:

Accepted Answer

An element

Question 5

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

Accepted Answer

Silver metal reacting to form a black grainy coating

Question 6

How many significant figures are in the number 0.00357?

Accepted Answer

3

Question 7

When adding 24.506 cm, 0.12 cm, and 4455.9 cm, what is the correct answer rounded to the proper number of decimal places?

Accepted Answer

$$4690.5$$

Question 8

Which rule applies when determining the number of significant figures in the result of a multiplication or division?

Accepted Answer

The answer should have the same number of significant figures as the number with the fewest significant figures.

Question 9

Which of the following statements about elements and compounds is TRUE?

Accepted Answer

Elements contain only one type of atom, while compounds contain two or more types of atoms.

Question 10

A student measures the mass of a sample as 45.872 g. How many significant figures are in this measurement?

Accepted Answer

5

Question 11

Which of the following is a physical change?

Accepted Answer

Dissolving sugar in water

Question 12

Which of the following best describes a molecule?

Accepted Answer

A group of atoms bonded together

Question 13

Which of the following numbers has 4 significant figures?

Accepted Answer

1.650

Question 14

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

Accepted Answer

A mixture of copper and zinc

Question 15

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

Accepted Answer

Make a conclusion before experimentation

Question 16

Which of the following best explains why keeping some variables constant is important in scientific experiments?

Accepted Answer

It ensures that the results are due to the variable being tested.

Question 17

How many significant figures are in the number 100.0?

Accepted Answer

4

Question 18

Which of the following is an example of a pure substance?

Accepted Answer

Copper metal

Question 19

A student calculates $$5.623 \div 0.3 on $$their calculator and gets $$18.743. $$What is the answer rounded to the correct number of significant figures?

Accepted Answer

$$18.7$$

Question 20

Which of the following statements about significant figures is TRUE?

Accepted Answer

Leading zeros are not significant.

CHEM101 Study Notes: Matter, Scientific Method, and Significant Figures

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