Question 1

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

Accepted Answer

$$5.2 	imes 10$$^{-4}$$

Question 2

How many significant figures are in the measurement $$0.02030 g$$?

Accepted Answer

4

Question 3

A student measures the mass of a sample as $$12.30 g $$and its volume as $$4.1 mL. $$What is the density of the sample, reported with the correct number of significant figures?

Accepted Answer

$$3.0 g/mL$$

Question 4

Which of the following is the correct conversion factor for converting kilometers to meters?

Accepted Answer

$$1 \ \mathrm{km} = 1000 \ \mathrm{m}$$

Question 5

Which of the following statements best describes a compound?

Accepted Answer

A substance composed of two or more elements chemically bonded in fixed ratios

Question 6

Which element is a metalloid?

Accepted Answer

Silicon

Question 7

What is the charge on an ion formed by a Group 2A (alkaline earth metal) element?

Accepted Answer

$$+2$$

Question 8

Which of the following is the correct formula for ammonium sulfate?

Accepted Answer

$$(NH_4$)_2SO_4$$

Question 9

How many moles are in $$18.0 g of $$water ($$H_2O$$)? (Molar mass of $$H_2O = 18.0 g/$$mol)

Accepted Answer

$$1.0$$ 	ext{ mole}$

Question 10

A chemical reaction has a theoretical yield of $$10.0 g $$and an actual yield of $$8.0 g. $$What is the percent yield?

Accepted Answer

$$80\%$$

Question 11

Which of the following is a strong electrolyte?

Accepted Answer

Hydrochloric acid ($$HCl)$$

Question 12

What is the molarity of a solution prepared by dissolving $$5.0$$ moles of NaCl in $$2.0$$ liters of solution?

Accepted Answer

$$2.5$$ 	ext{ M}$

Question 13

Which of the following best describes the difference between a mixture and a compound?

Accepted Answer

A mixture can be separated by physical means, a compound cannot

Question 14

Which of the following ions is polyatomic?

Accepted Answer

$$NO_3$$^-$$

Question 15

What is the empirical formula for a compound containing $$40.0\%$$ carbon, $$6.7\%$$ hydrogen, and $$53.3\%$$ oxygen by mass?

Accepted Answer

$$CH_2O$$

Question 16

A solution is prepared by diluting $$50.0 mL of$$ $$6.0 M $$HCl to a final volume of $$300.0 mL. $$What is the final concentration?

Accepted Answer

$$1.0$$ 	ext{ M}$

Question 17

Which of the following is the correct balanced equation for the reaction of hydrogen gas with oxygen gas to form water?

Accepted Answer

$$2H_2 + O_2$ \rightarrow 2H_2O$$

Question 18

Which of the following statements about metals is correct?

Accepted Answer

Metals are malleable and ductile

Question 19

How many atoms are in $$2.00$$ moles of carbon?

Accepted Answer

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

Question 20

Which of the following is the correct name for $$FeCl_3$$?

Accepted Answer

Iron(III) chloride

General Chemistry Study Notes: Measurement, Atoms, Molecules, and Mass Relationships

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