Question 1

Which of the following best describes a compound?

Accepted Answer

A pure substance formed when two or more elements combine in constant proportions to make a new substance.

Question 2

A nurse needs to convert a medication dosage from milligrams to grams. If the prescribed dose is 250 mg, what is the equivalent in grams?

Accepted Answer

$$0.25 	ext{ g}$$

Question 3

Which of the following is a heterogeneous mixture?

Accepted Answer

Oil and water

Question 4

What is the atomic number of an element, and what does it represent?

Accepted Answer

The number of protons in the nucleus

Question 5

A patient weighs 162 lb. Convert this weight to kilograms using the conversion factor $$1 	ext{ kg} = 2.20 	ext{ lb}.$$

Accepted Answer

$$73.6 	ext{ kg}$$

Question 6

Which of the following statements about metals is correct?

Accepted Answer

Metals are shiny, ductile, and malleable.

Question 7

How many significant figures are in the measurement $$22.000 	ext{ g}$$?

Accepted Answer

5

Question 8

Which metric prefix represents $$10^{-6}$$?

Accepted Answer

micro-

Question 9

A sample of water is measured as $$537 \mu	ext{L}. $$Convert this to milliliters and express your answer with the correct number of significant figures.

Accepted Answer

$$0.537 	ext{ mL}$$

Question 10

Which of the following is NOT a characteristic of a solid?

Accepted Answer

Fills the volume and shape of whatever container it occupies

Question 11

Which of the following best describes a chemical change?

Accepted Answer

A conversion of one substance to another

Question 12

What is the correct scientific notation for one billion?

Accepted Answer

$$1 	imes 10$$^{9}$$

Question 13

Which of the following is a pure substance?

Accepted Answer

Helium

Question 14

A glucose molecule is represented as $$	ext{C}_6	ext{H}_{12}	ext{O}_6. $$What does the subscript indicate?

Accepted Answer

The ratio of elements in the compound

Question 15

Which element has three protons in its nucleus?

Accepted Answer

Lithium

Question 16

If a measurement is recorded as $$0.00032 	ext{ cm}$$, how many significant figures does it have?

Accepted Answer

2

Question 17

Which group on the periodic table contains elements with two valence electrons?

Accepted Answer

Group 2A

Question 18

A conversion factor is best described as:

Accepted Answer

A ratio used to convert units from one system to another

Question 19

Which of the following statements about atoms is correct?

Accepted Answer

Atoms are the basic units of matter and contain protons, neutrons, and electrons.

Question 20

A patient receives a medication dose of $$50.0 	ext{ mg}. $$How many significant figures are in this measurement?

Accepted Answer

3

GOB I Review: Introduction to Chemistry, Measurement, and Atomic Structure

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