Q: Convert $$0.0056 \ \mathrm{kg} to $$milligrams ($$\mathrm{mg}).$$

$$5.6 \times 10^6$ \ \mathrm{mg}$$

Q: A sample contains $$2.0 \ \mathrm{mol} of $$water ($$\mathrm{H_2O}). $$How many molecules of water are present? ($$N_A = 6.02 \times 10$$^{23}$$ \ \mathrm{mol}^{-1})$$

$$1.20 \times 10$$^{24}$$ molecules

Q: A patient receives a dose of $$0.250 \ \mathrm{g} of a $$drug. How many micrograms ($$\mu\mathrm{g}) is $$this?

$$2.50 \times 10^5$ \ \mu\mathrm{g}$$

Question 1

Which of the following is a chemical property of iron?

Accepted Answer

Iron reacts with oxygen to form rust.

Question 2

A sample of gold has a mass of $$96.5 \ \mathrm{g}$$ and a volume of $$5.00 \ \mathrm{cm^3$}. $$What is the density of gold?

Accepted Answer

$$19.3 \ \mathrm{g/cm^3$}$$

Question 3

Which of the following best describes air?

Accepted Answer

Homogeneous mixture

Question 4

How many protons, neutrons, and electrons are in $$^{23}_{11}\mathrm{Na}$$?

Accepted Answer

11 protons, 12 neutrons, 11 electrons

Question 5

Convert $$0.0056 \ \mathrm{kg} to $$milligrams ($$\mathrm{mg}).$$

Accepted Answer

$$5.6 	imes 10^6$ \ \mathrm{mg}$$

Question 6

Which of the following is the correct electron configuration for oxygen ($$Z=8$$)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^4$$

Question 7

Which of the following changes of state is correctly matched with its process name?

Accepted Answer

Liquid to gas: evaporation

Question 8

A sample contains $$2.0 \ \mathrm{mol} of $$water ($$\mathrm{H_2O}). $$How many molecules of water are present? ($$N_A = 6.02 	imes 10$$^{23}$$ \ \mathrm{mol}^{-1})$$

Accepted Answer

$$1.20 	imes 10$$^{24}$$ molecules

Question 9

Which of the following statements best describes the law of conservation of mass?

Accepted Answer

The total mass of reactants equals the total mass of products in a chemical reaction.

Question 10

A student measures the length of a metal rod as $$12.30 \ \mathrm{cm}$$, $$12.3 \ \mathrm{cm}$$, and $$12.300 \ \mathrm{cm}. $$How many significant figures are in each measurement, respectively?

Accepted Answer

4, 3, 5

Question 11

Which of the following is a metalloid?

Accepted Answer

Silicon (Si)

Question 12

A naturally occurring element has two isotopes: $$^{35}\mathrm{Cl} (75.8$$%, mass = 34.97 u) and $$^{37}\mathrm{Cl} (24.2$$%, mass = 36.97 u). What is the average atomic mass of chlorine?

Accepted Answer

$$35.45 \ \mathrm{u}$$

Question 13

Which of the following is a heterogeneous mixture?

Accepted Answer

Salad

Question 14

Convert $$3.50 \ \mathrm{in} to $$centimeters using the conversion $$1 \ \mathrm{in} = 2.54 \ \mathrm{cm}.$$

Accepted Answer

$$8.89 \ \mathrm{cm}$$

Question 15

Which of the following is a physical change?

Accepted Answer

Melting of ice

Question 16

A solution is prepared by dissolving $$5.00 \ \mathrm{g} of $$salt in $$95.0 \ \mathrm{g} of $$water. What is the percent by mass of salt in the solution?

Accepted Answer

$$5.00\%$$

Question 17

Which of the following best describes the law of conservation of energy?

Accepted Answer

Energy cannot be created or destroyed, only transformed.

Question 18

Which of the following is the correct scientific notation for $$0.000456$$?

Accepted Answer

$$4.56 	imes 10$$^{-4}$$

Question 19

Which of the following elements is a nonmetal?

Accepted Answer

Sulfur (S)

Question 20

A patient receives a dose of $$0.250 \ \mathrm{g} of a $$drug. How many micrograms ($$\mu\mathrm{g}) is $$this?

Accepted Answer

$$2.50 	imes 10^5$ \ \mu\mathrm{g}$$

Introductory Chemistry Study Guide: Chapters 1–4

Guida di studio - Domande di pratica

Study guide - Flashcard