Question 1

Which of the following is a chemical property of sodium metal?

Accepted Answer

It reacts vigorously with water to produce hydrogen gas.

Question 2

Which of the following best describes a mixture of sand and salt?

Accepted Answer

A heterogeneous mixture

Question 3

How many significant figures are in the measurement 0.00450 g?

Accepted Answer

3

Question 4

Which of the following is the correct scientific notation for 0.00036?

Accepted Answer

$$3.6 	imes 10$$^{-4}$$

Question 5

A student measures the mass of a sample as 12.30 g and its volume as 4.10 mL. What is the density of the sample?

Accepted Answer

$$3.00\ \mathrm{g/mL}$$

Question 6

Which of the following elements is represented by the symbol 'K'?

Accepted Answer

Potassium

Question 7

How many protons, neutrons, and electrons are in $$^{35}_{17}\mathrm{Cl}$$?

Accepted Answer

17 protons, 18 neutrons, 17 electrons

Question 8

Which of the following ions has the electron configuration of a noble gas?

Accepted Answer

$$\mathrm{Na}^+$$

Question 9

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

Accepted Answer

$$\mathrm{Mg}_3\mathrm{N}_2$$

Question 10

Which of the following is a polyatomic ion?

Accepted Answer

$$\mathrm{NO}_3^-$$

Question 11

Which statement correctly describes the difference between covalent and ionic compounds?

Accepted Answer

Covalent compounds are formed by sharing electrons; ionic compounds are formed by the transfer of electrons.

Question 12

Which molecule is polar?

Accepted Answer

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

Question 13

How many valence electrons does a nitrogen atom have?

Accepted Answer

5

Question 14

Which of the following best describes the electron dot structure for $$\mathrm{O}_2$$?

Accepted Answer

Each oxygen atom shares two pairs of electrons, forming a double bond.

Question 15

Which of the following is the correct molar mass for $$\mathrm{Na}_2\mathrm{SO}_4$$?

Accepted Answer

$$142\ \mathrm{g/mol}$$

Question 16

Which of the following is an organic molecule?

Accepted Answer

$$\mathrm{C}_2\mathrm{H}_6$$

Question 17

A graduated cylinder contains 25.0 mL of water. After adding a metal object, the volume rises to 32.5 mL. What is the volume of the metal object?

Accepted Answer

$$7.5\ \mathrm{mL}$$

Question 18

Which of the following best describes the shape of a methane ($$\mathrm{CH}_4) $$molecule according to VSEPR theory?

Accepted Answer

Tetrahedral

Question 19

Which of the following is the correct electron configuration for a neutral oxygen atom?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^4$$

Question 20

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes of an element have the same number of protons but different numbers of neutrons.

General Chemistry I: Foundational Concepts and Skills Study Guide

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