Question 1

Which of the following statements best describes a chemical change?

Accepted Answer

Cooking an egg until it solidifies.

Question 2

A sample of a compound contains only carbon and oxygen. Which of the following best classifies this sample?

Accepted Answer

A pure substance and a chemical compound

Question 3

Which of the following is the correct scientific notation for the number 0.000345?

Accepted Answer

$$3.45 	imes 10$$^{-4}$$

Question 4

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

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

Question 5

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 6

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

Accepted Answer

17 protons, 20 neutrons, 18 electrons

Question 7

Which element is in Group 2, Period 3 of the periodic table?

Accepted Answer

Magnesium

Question 8

Which of the following ions is isoelectronic with neon ($$\mathrm{Ne}$$)?

Accepted Answer

$$\mathrm{Na}^+$$

Question 9

What is the correct name for the compound $$\mathrm{FeCl}_3$$?

Accepted Answer

Iron(III) chloride

Question 10

Which of the following best describes the bonding in $$\mathrm{CO}_2$$?

Accepted Answer

Nonpolar covalent bonds and a linear molecular shape

Question 11

A molecule of ammonia ($$\mathrm{NH}_3) $$has which of the following molecular geometries and bond angles?

Accepted Answer

Trigonal pyramidal, $$\sim 107^\circ$$

Question 12

Which of the following pairs of elements would form an ionic compound?

Accepted Answer

Sodium and chlorine

Question 13

Which of the following statements about electronegativity is correct?

Accepted Answer

Electronegativity increases from left to right across a period and from bottom to top in a group.

Question 14

Which of the following is the correct Lewis dot structure for a molecule of water ($$\mathrm{H}_2\mathrm{O}$$)?

Accepted Answer

O atom with two lone pairs and two single bonds to H atoms

Question 15

A sample contains 2.0 moles of $$\mathrm{NaCl}. $$What is the mass of this sample? (Molar mass of $$\mathrm{NaCl} = 58.44\ \mathrm{g/mol})$$

Accepted Answer

$$116.88\ \mathrm{g}$$

Question 16

Which of the following best describes a mixture?

Accepted Answer

A combination of two or more substances that retain their individual properties

Question 17

Which of the following polyatomic ions has a $$-2$$ charge?

Accepted Answer

$$\mathrm{SO}_4$$^{2-}$$

Question 18

A student needs to convert $$250\ \mathrm{mg} to $$grams. What is the correct answer?

Accepted Answer

$$0.250\ \mathrm{g}$$

Question 19

Which of the following molecules is polar due to its shape, even though the bonds are polar?

Accepted Answer

$$\mathrm{H}_2\mathrm{O}$$

Question 20

Which of the following best explains why $$\mathrm{NaCl}$$ conducts electricity when dissolved in water but not as a solid?

Accepted Answer

Ions are free to move in solution but fixed in place in the solid.

GOB Chemistry Study Guide: Matter, Measurements, Atomic Structure, and Chemical Bonding (Chapters 1-4)

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