Q: A student needs to convert $$5.0\ \mathrm{km} to $$meters. Which of the following is the correct answer?

$$5.0 \times 10$$^{3}$$\ \mathrm{m}$$

Question 1

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

Accepted Answer

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

Question 2

A student measures the mass of a metal sample as 12.34 g and its volume as 4.1 mL. What is the density of the metal, reported with the correct number of significant figures?

Accepted Answer

$$3.0\ \mathrm{g/mL}$$

Question 3

Convert $$0.00056 to $$scientific notation.

Accepted Answer

$$5.6 	imes 10$$^{-4}$$

Question 4

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

Accepted Answer

Density

Question 5

A sample of water is heated from $$25\ ^\circ\mathrm{C} to$$ $$75\ ^\circ\mathrm{C}. If $$the mass of water is $$100\ \mathrm{g}$$ and the specific heat of water is $$4.18\ \mathrm{J/g\cdot ^\circ C}$$, how much heat is absorbed?

Accepted Answer

$$20,900\ \mathrm{J}$$

Question 6

Which of the following statements best describes the difference between accuracy and precision?

Accepted Answer

Accuracy refers to how close a measurement is to the true value, while precision refers to how close repeated measurements are to each other.

Question 7

Which of the following is a chemical property?

Accepted Answer

Ability of iron to rust

Question 8

A certain element has an atomic number of 17 and a mass number of 35. How many neutrons does it have?

Accepted Answer

18

Question 9

Which of the following is a diatomic element in its natural state?

Accepted Answer

$$\mathrm{O}_2$$

Question 10

A student needs to convert $$5.0\ \mathrm{km} to $$meters. Which of the following is the correct answer?

Accepted Answer

$$5.0 	imes 10$$^{3}$$\ \mathrm{m}$$

Question 11

Which of the following best describes a compound?

Accepted Answer

A substance composed of two or more elements chemically combined in a fixed ratio

Question 12

Which of the following is NOT part of Dalton’s Atomic Theory?

Accepted Answer

Atoms are created or destroyed in chemical reactions.

Question 13

A sample contains $$2.0\ \mathrm{mol} of$$ $$\mathrm{NaCl}. $$How many formula units of $$\mathrm{NaCl}$$ are present? ($$N_A = 6.022 	imes 10$$^{23}$$\ \mathrm{mol}^{-1})$$

Accepted Answer

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

Question 14

Which of the following best describes a physical change?

Accepted Answer

Boiling of water

Question 15

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 16

Which of the following best describes the phase change that occurs when dry ice ($$\mathrm{CO}_2) is $$left at room temperature?

Accepted Answer

Sublimation

Question 17

Which of the following is a correct temperature conversion from $$100\ ^\circ\mathrm{C} to $$Kelvin?

Accepted Answer

$$373\ \mathrm{K}$$

Question 18

A sample of chlorine contains $$75.77\%$$ $$^{35}\mathrm{Cl} ($$mass $$= 34.97\ \mathrm{u}) $$and $$24.23\%$$ $$^{37}\mathrm{Cl} ($$mass $$= 36.97\ \mathrm{u}). $$What is the average atomic mass of chlorine?

Accepted Answer

$$35.45\ \mathrm{u}$$

Question 19

Which of the following is a mixture?

Accepted Answer

Air

Question 20

A neutral atom of sulfur gains two electrons. What is the resulting ion called?

Accepted Answer

Anion

Fundamental Concepts in General Chemistry: Measurement, Matter, and Atomic Theory

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