Q: Which of the following conversion factors would you use to convert 250 milliliters to liters?

$$1 \text{ L} = 1000 \text{ mL}$$

Q: How many molecules are present in 0.50 moles of $$\text{CO}_2$$?

$$3.01 \times 10$$^{23}$$ molecules

Q: Which of the following is a correct balanced chemical equation for the combustion of methane ($$\text{CH}_4$$)?

$$\text{CH}_4 + 2\text{O}_2 \rightarrow \text{CO}_2 + 2\text{H}_2\text{O}$$

Q: Which of the following is a correct example of a single displacement reaction?

$$\text{Zn} + \text{CuSO}_4 \rightarrow \text{ZnSO}_4 + \text{Cu}$$

Question 1

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

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 2

A student measures the mass of a sample three times and gets values of 2.50 g, 2.51 g, and 2.49 g. The true mass is 3.00 g. Which statement is correct about the measurements?

Accepted Answer

The measurements are precise but not accurate.

Question 3

Which of the following is the correct scientific notation for the number 0.0000456?

Accepted Answer

$$4.56 	imes 10$$^{-5}$$

Question 4

Which of the following conversion factors would you use to convert 250 milliliters to liters?

Accepted Answer

$$1 	ext{ L} = 1000 	ext{ mL}$$

Question 5

An atom has 17 protons, 18 neutrons, and 17 electrons. What is its atomic number and mass number?

Accepted Answer

Atomic number $$= 17$$, mass number $$= 35$$

Question 6

Which group on the periodic table contains the noble gases?

Accepted Answer

Group 8A (Group 18)

Question 7

What is the correct formula for the ionic compound formed between magnesium and chlorine?

Accepted Answer

$$	ext{MgCl}_2$$

Question 8

Which of the following is the correct name for the compound $$	ext{N}_2	ext{O}_5$$?

Accepted Answer

Dinitrogen pentoxide

Question 9

What is the molar mass of $$	ext{H}_2	ext{SO}_4$$?

Accepted Answer

$$98.09 	ext{ g/mol}$$

Question 10

How many molecules are present in 0.50 moles of $$	ext{CO}_2$$?

Accepted Answer

$$3.01 	imes 10$$^{23}$$ molecules

Question 11

Which of the following acids is correctly named?

Accepted Answer

HNO$$_3 is $$nitric acid

Question 12

Which of the following is a correct balanced chemical equation for the combustion of methane ($$	ext{CH}_4$$)?

Accepted Answer

$$	ext{CH}_4 + 2	ext{O}_2 ightarrow 	ext{CO}_2 + 2	ext{H}_2	ext{O}$$

Question 13

If 10.0 g of $$	ext{H}_2$$ reacts with excess $$	ext{O}_2 to $$form water, how many grams of $$	ext{H}_2	ext{O}$$ are produced? ($$	ext{H}_2 + 	ext{O}_2 ightarrow 2	ext{H}_2	ext{O})$$

Accepted Answer

$$89.3 	ext{ g}$$

Question 14

Which of the following best describes a redox (oxidation-reduction) reaction?

Accepted Answer

A reaction in which electrons are transferred between species

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

$$	ext{CH}_2	ext{O}$$

Question 16

Which of the following molecules has a triple bond in its Lewis structure?

Accepted Answer

$$	ext{N}_2$$

Question 17

Which of the following is the correct electron configuration for a neutral atom of sodium ($$Z=11$$)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^1$$

Question 18

A solution contains 0.25 moles of NaCl dissolved in enough water to make 500 mL of solution. What is the molarity of the solution?

Accepted Answer

$$0.50\ 	ext{M}$$

Question 19

Which of the following is a correct example of a single displacement reaction?

Accepted Answer

$$	ext{Zn} + 	ext{CuSO}_4 ightarrow 	ext{ZnSO}_4 + 	ext{Cu}$$

General Chemistry Exam 1 Review: Measurements, Atoms, Compounds, and Reactions

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