Question 1

Which of the following is the correct SI unit for measuring mass?

Accepted Answer

kilogram (kg)

Question 2

A student measures the length of a table as 2.50 meters. How many significant figures are in this measurement?

Accepted Answer

3

Question 3

Which of the following is an example of a heterogeneous mixture?

Accepted Answer

Sand and iron filings

Question 4

Convert $$25\ ^\circ \mathrm{C} to $$Fahrenheit using the formula $$F = \frac{9}{5}C + 32. $$What is the answer?

Accepted Answer

$$77\ ^\circ \mathrm{F}$$

Question 5

Which element is a Group 2 metal and has the symbol 'Mg'?

Accepted Answer

Magnesium

Question 6

A radioactive isotope undergoes beta decay. Which of the following correctly describes the change in its atomic number?

Accepted Answer

The atomic number increases by 1

Question 7

How many moles are in $$3.01 	imes 10$$^{23}$$ molecules of water? (Avogadro's number = 6.02$$ 	imes $$10^{23})$$

Accepted Answer

$$0.5$$ moles

Question 8

What is the molar mass of $$\mathrm{NaCl}$$? (Na: $$22.99\ \mathrm{g/mol}$$, Cl: $$35.45\ \mathrm{g/mol})$$

Accepted Answer

$$58.44\ \mathrm{g/mol}$$

Question 9

Which of the following compounds contains a polyatomic ion?

Accepted Answer

$$\mathrm{$$NaNO_3$$}$$

Question 10

Which molecule has a bent shape according to VSEPR theory?

Accepted Answer

$$\mathrm{H_2O}$$

Question 11

A patient receives a $$250\ \mathrm{mL}$$ saline solution containing $$0.90\% ($$mass/volume) NaCl. How many grams of NaCl are in the solution?

Accepted Answer

$$2.25\ \mathrm{g}$$

Question 12

Which of the following statements about exothermic reactions is correct?

Accepted Answer

They release energy to the surroundings

Question 13

A $$50.0\ \mathrm{g}$$ sample of metal absorbs $$400\ \mathrm{J} of $$heat and its temperature increases by $$8.0\ ^\circ \mathrm{C}. $$What is the specific heat ($$c) of $$the metal? Use $$q = mc\Delta T.$$

Accepted Answer

$$1.0\ \mathrm{J/g\ ^\circ C}$$

Question 14

Which of the following is a correct balanced nuclear equation for the alpha decay of $$^{226}\mathrm{Ra}$$?

Accepted Answer

$$^{226}\mathrm{Ra} \$$rightarrow ^{222}$$\mathrm{Rn} $$+ ^{4}$$\mathrm{He}$$

Question 15

Which of the following best describes the process of nuclear fusion?

Accepted Answer

Two light nuclei combine to form a heavier nucleus

Question 16

A $$2.0\ \mathrm{L}$$ sample of gas at $$1.0\ \mathrm{atm} is $$compressed to $$0.5\ \mathrm{L} at $$constant temperature. What is the new pressure? (Boyle's Law: $$P_1V_1 = P_2V_2)$$

Accepted Answer

$$4.0\ \mathrm{atm}$$

Question 17

Which of the following is a nonelectrolyte when dissolved in water?

Accepted Answer

Glucose ($$\mathrm{C_6H_{12}O_6$})$$

Question 18

A solution is prepared by diluting $$100\ \mathrm{mL} of$$ $$2.0\ \mathrm{M}$$ NaOH to a final volume of $$500\ \mathrm{mL}. $$What is the new concentration? (Use $$C_1V_1 = C_2V_2)$$

Accepted Answer

$$0.40\ \mathrm{M}$$

Question 19

Which of the following best describes the effect of increasing temperature on the solubility of a solid in water?

Accepted Answer

Solubility increases

CHEM 10003 Chemical Principles: Chapters 2–9 Mini-Study Guide

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