Question 1

Which of the following numbers is correctly written in scientific notation?

Accepted Answer

$$4.56 	imes 10$$^{3}$$

Question 2

How many significant figures are in the measurement $$0.004520$$?

Accepted Answer

4

Question 3

A patient is prescribed a medication at a dose of $$15 \ \mathrm{mg/kg}. If $$the patient weighs $$154 \ \mathrm{lb}$$, and the medication is available as $$250 \ \mathrm{mg}$$ tablets, how many tablets should be administered? (1 kg = 2.205 lb)

Accepted Answer

4 tablets

Question 4

Which of the following is a correct metric conversion for $$0.025 \ \mathrm{g} to $$milligrams?

Accepted Answer

$$25 \ \mathrm{mg}$$

Question 5

A sample of liquid has a mass of $$13.2 \ \mathrm{g}$$ and a volume of $$16.5 \ \mathrm{mL}. $$What is its density?

Accepted Answer

$$0.800 \ \mathrm{g/mL}$$

Question 6

Which of the following best describes a compound?

Accepted Answer

A substance formed when atoms of two or more different elements combine in fixed proportions

Question 7

Which of the following is a heterogeneous mixture?

Accepted Answer

Sand and water

Question 8

Which statement correctly distinguishes between a compound and a mixture?

Accepted Answer

A compound has a fixed ratio of elements and can only be separated by chemical means, while a mixture has a variable composition and can be separated by physical means.

Question 9

Which of the following statements about atoms is TRUE?

Accepted Answer

Atoms are the smallest units of matter that retain the properties of an element.

Question 10

An atom has an atomic number of 17 and a mass number of 37. How many neutrons does it have?

Accepted Answer

20

Question 11

Which subatomic particle is responsible for the chemical properties of an atom?

Accepted Answer

Electron

Question 12

A neutral atom of magnesium has an atomic number of 12 and a mass number of 24. How many electrons does it have?

Accepted Answer

12

Question 13

Which of the following is an example of a molecule that is also an element?

Accepted Answer

$$\mathrm{O}_2$$

Question 14

A student adds $$2.00 \ \mathrm{g} of $$salt to $$100.0 \ \mathrm{g} of $$water and stirs until all the salt dissolves. What type of mixture is formed?

Accepted Answer

Homogeneous mixture (solution)

Question 15

Which of the following best explains why isotopes of the same element have different mass numbers?

Accepted Answer

They have different numbers of neutrons.

Question 16

A nurse needs to prepare a $$500 \ \mathrm{mL} IV $$bag with a glucose concentration of $$0.9\% (w/v). $$How many grams of glucose are needed?

Accepted Answer

$$4.5 \ \mathrm{g}$$

Question 17

Which of the following statements about density is correct?

Accepted Answer

Density can be used as a conversion factor between mass and volume.

Question 18

Which of the following is a correct application of significant figure rules for multiplication: $$2.34 	imes 1.2$$?

Accepted Answer

$$2.8$$

Question 19

Which of the following best describes the role of neutrons in the nucleus?

Accepted Answer

They help stabilize the nucleus by reducing repulsion between protons.

Question 20

A solution is prepared by mixing $$50 \ \mathrm{mL} of $$ethanol with $$50 \ \mathrm{mL} of $$water. Which statement best describes the resulting mixture?

Accepted Answer

It is a homogeneous mixture because the components are uniformly distributed.

GOB Chemistry Study Guide: Matter, Measurement, and Atomic Structure (Chapters 2–4)

Study Guide - Practice Questions

Study Guide - Flashcards