Q: Convert $$5.0\ \mathrm{mg} to $$grams using the appropriate metric prefix.

$$5.0 \times 10$$^{-3}$$\ \mathrm{g}$$

Question 1

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

Accepted Answer

kilogram (kg)

Question 2

A student measures the length of a desk as 1.250 m. How many significant figures are in this measurement?

Accepted Answer

4

Question 3

Which of the following numbers is an exact number?

Accepted Answer

There are 12 eggs in a dozen.

Question 4

Convert $$5.0\ \mathrm{mg} to $$grams using the appropriate metric prefix.

Accepted Answer

$$5.0 	imes 10$$^{-3}$$\ \mathrm{g}$$

Question 5

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 6

Which of the following is a heterogeneous mixture?

Accepted Answer

Salad dressing with oil and vinegar

Question 7

A patient’s temperature is $$39.0\ ^\circ\mathrm{C}. $$What is this temperature in Kelvin?

Accepted Answer

$$312.2\ \mathrm{K}$$

Question 8

Which of the following statements about energy is correct?

Accepted Answer

A moving car has kinetic energy.

Question 9

How much heat (in joules) is required to raise the temperature of $$50.0\ \mathrm{g} of $$water from $$20.0\ ^\circ\mathrm{C} to$$ $$30.0\ ^\circ\mathrm{C}$$? (Specific heat of water $$= 4.18\ \mathrm{J/g\ ^\circ C})$$

Accepted Answer

$$2090\ \mathrm{J}$$

Question 10

Which of the following elements is a metalloid?

Accepted Answer

Si

Question 11

How many protons, neutrons, and electrons are in $$^{37}_{17}\mathrm{Cl}$$?

Accepted Answer

17 protons, 20 neutrons, 17 electrons

Question 12

Which of the following nuclear equations represents beta decay?

Accepted Answer

$$^{14}_{6}\mathrm{C} \$$rightarrow ^{14}$$_{7}\mathrm{N} $$+ ^{0}$$_{-1}\mathrm{e}$$

Question 13

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

Accepted Answer

$$\mathrm{MgCl}_2$$

Question 14

Which of the following molecules is polar?

Accepted Answer

$$\mathrm{H_2O}$$

Question 15

How many moles of $$\mathrm{O}$$ atoms are in $$2.00\ \mathrm{mol} of$$ $$\mathrm{H_2SO_4}$$?

Accepted Answer

$$8.00\ \mathrm{mol}$$

Question 16

What is the molar mass of $$\mathrm{Ca(OH)_2}$$?

Accepted Answer

$$74.10\ \mathrm{g/mol}$$

Question 17

A reaction is described by the equation: $$2\mathrm{H_2$} + \mathrm{O_2$} \rightarrow 2\mathrm{H_2O}. $$How many grams of $$\mathrm{H_2O}$$ are produced from $$4.00\ \mathrm{g} of$$ $$\mathrm{H_2$}$$? ($$\mathrm{Molar\ mass\ of\ H_2$} = 2.02\ \mathrm{g/mol}$$, $$\mathrm{H_2O} = 18.02\ \mathrm{g/mol})$$

Accepted Answer

$$35.7\ \mathrm{g}$$

Question 18

Which of the following best describes an exothermic reaction?

Accepted Answer

A reaction that releases heat to the surroundings

Question 19

A gas occupies $$2.50\ \mathrm{L} at$$ $$1.00\ \mathrm{atm}. If $$the pressure increases to $$5.00\ \mathrm{atm} at $$constant temperature, what is the new volume?

Accepted Answer

$$0.500\ \mathrm{L}$$

Question 20

What is the molarity of a solution prepared by dissolving $$5.00\ \mathrm{g} of$$ $$\mathrm{NaCl} in $$enough water to make $$250.0\ \mathrm{mL} of $$solution? ($$\mathrm{Molar\ mass\ of\ NaCl} = 58.44\ \mathrm{g/mol})$$

Accepted Answer

$$0.342\ \mathrm{M}$$

CHEM 10003 Chemical Principles: Chapters 2–9 Study Guide

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