Q: What is the frequency of light with a wavelength of $$5.00 \times 10$$^{-7}$$\ \mathrm{m}$$? (Speed of light $$c = 3.00 \times 10^8$\ \mathrm{m/s})$$

$$6.00 \times 10$$^{14}$$\ \mathrm{Hz}$$

Question 1

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 2

Which of the following represents a chemical change?

Accepted Answer

Iron rusting in moist air

Question 3

Convert $$0.075$$ kilometers to centimeters. (Use metric conversions: $$1\ \mathrm{km} = 1000\ \mathrm{m}$$, $$1\ \mathrm{m} = 100\ \mathrm{cm})$$

Accepted Answer

$$7500\ \mathrm{cm}$$

Question 4

Which of the following is a homogeneous mixture?

Accepted Answer

Saltwater

Question 5

A sample of gold has two naturally occurring isotopes: $$^{197}\mathrm{Au} ($$abundance $$100\%). $$What is the atomic mass of gold?

Accepted Answer

$$197.0$$

Question 6

Which of the following statements is NOT part of Dalton’s Atomic Theory?

Accepted Answer

Atoms can be subdivided into protons, neutrons, and electrons.

Question 7

A student records a temperature of $$25.0\ ^\circ\mathrm{C}. $$What is this temperature in Kelvin?

Accepted Answer

$$298.2\ \mathrm{K}$$

Question 8

Which of the following elements is a metalloid?

Accepted Answer

Silicon

Question 9

What is the frequency of light with a wavelength of $$5.00 	imes 10$$^{-7}$$\ \mathrm{m}$$? (Speed of light $$c = 3.00 	imes 10^8$\ \mathrm{m/s})$$

Accepted Answer

$$6.00 	imes 10$$^{14}$$\ \mathrm{Hz}$$

Question 10

Which of the following electron configurations represents the element magnesium ($$Z=12$$)?

Accepted Answer

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

Question 11

A sample contains $$2.0$$ moles of water. How many molecules does it contain? ($$N_A = 6.02 	imes 10$$^{23}$$\ \mathrm{mol}^{-1})$$

Accepted Answer

$$1.20 	imes 10$$^{24}$$

Question 12

Which of the following is an example of potential energy?

Accepted Answer

A stretched bow ready to shoot an arrow

Question 13

Which law states that mass is neither created nor destroyed in a chemical reaction?

Accepted Answer

Law of Conservation of Mass

Question 14

A student needs to prepare $$250.0 mL of a$$ $$10.0\% (v/v) $$ethanol solution. How many mL of ethanol are required?

Accepted Answer

$$25.0\ \mathrm{mL}$$

Question 15

Which of the following is the correct symbol for an atom with $$17$$ protons, $$18$$ neutrons, and $$17$$ electrons?

Accepted Answer

$$^{35}_{17}\mathrm{Cl}$$

Question 16

Which of the following is a physical property?

Accepted Answer

Boiling point

Question 17

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

Accepted Answer

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

Question 18

Which of the following best describes the difference between a compound and a mixture?

Accepted Answer

A compound has a fixed composition; a mixture does not.

Question 19

If a calculator displays $$12.3456$$ and you need to round to three significant figures, what is the correct value?

Accepted Answer

$$12.3$$

Question 20

Which of the following best describes the diagonal rule for electron configuration?

Accepted Answer

It predicts the order in which atomic orbitals are filled.

CHM1025 Study Guide: Foundations of General Chemistry (Corwin 8th Ed, Exam #1)

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