Q: Convert $$3.25 \times 10^4$ m to kilometers using scientific notation.

$$3.25 \times 10^1$\ \mathrm{km}$$

Q: Convert $$100\ \mathrm{cm}^3 to$$ $$\mathrm{m}^3.$$

$$1.0 \times 10$$^{-6}$$\ \mathrm{m}^3$$

Question 1

A laboratory balance gives a mass reading of 0.05670 g for a sample. How many significant figures does this measurement have?

Accepted Answer

5

Question 2

A student measures the length of a metal rod as 12.45 cm and the width as 1.2 cm. What is the area of the rod, reported with the correct number of significant figures?

Accepted Answer

$$15\ \mathrm{cm}^2$$

Question 3

Convert $$3.25 	imes 10^4$ m to kilometers using scientific notation.

Accepted Answer

$$3.25 	imes 10^1$\ \mathrm{km}$$

Question 4

Which of the following best describes a sample of air?

Accepted Answer

A homogeneous mixture

Question 5

Which phase change is described by the process of dry ice (solid CO$$_2) $$turning directly into carbon dioxide gas?

Accepted Answer

Sublimation

Question 6

A sample contains 2.0 moles of hydrogen atoms and 1.0 mole of oxygen atoms. What is the correct chemical formula for this compound?

Accepted Answer

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

Question 7

Which of the following statements about isotopes is correct?

Accepted Answer

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

Question 8

Given the following isotopes of magnesium: $$^{24}\mathrm{Mg} (78.99$$%, 23.985 amu), $$^{25}\mathrm{Mg} (10.00$$%, 24.986 amu), and $$^{26}\mathrm{Mg} (11.01$$%, 25.983 amu), what is the atomic mass of magnesium? (Round to two decimal places.)

Accepted Answer

$$24.31\ \mathrm{amu}$$

Question 9

Which of the following is the correct electron configuration for a neutral atom of phosphorus (atomic number 15)?

Accepted Answer

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

Question 10

A patient receives a dose of medication at a rate of $$0.50\ \mathrm{mg/kg} of $$body weight. If the patient weighs $$70.0\ \mathrm{kg}$$, how many grams of medication should be administered?

Accepted Answer

$$0.035\ \mathrm{g}$$

Question 11

Which of the following best describes the location and charge of a neutron in an atom?

Accepted Answer

In the nucleus, with no charge

Question 12

Convert $$100\ \mathrm{cm}^3 to$$ $$\mathrm{m}^3.$$

Accepted Answer

$$1.0 	imes 10$$^{-6}$$\ \mathrm{m}^3$$

Question 13

Which of the following is the correct noble gas (core) notation for the electron configuration of silver (Ag, atomic number 47)?

Accepted Answer

$$[Kr]\ 5s^1$\ 4d$$^{10}$$

Question 14

A car is traveling at $$25.0\ \mathrm{m/s}. $$What is its speed in $$\mathrm{km/hr}$$?

Accepted Answer

$$90.0\ \mathrm{km/hr}$$

Question 15

Which of the following elements is a transition metal?

Accepted Answer

Silver (Ag)

Question 16

Which of the following statements about the relationship between wavelength ($$\lambda$$), frequency ($$
u$$), and the speed of light ($$c) is $$correct?

Accepted Answer

$$c = \lambda 
u$$

Question 17

Which of the following is a correct classification for salt water?

Accepted Answer

Homogeneous mixture

Question 18

Which of the following best explains why energy is absorbed when an electron moves from a lower to a higher energy level in an atom?

Accepted Answer

The electron requires energy to overcome the attraction of the nucleus.

Question 19

Which of the following is the correct scientific notation for the number 0.0004560?

Accepted Answer

$$4.560 	imes 10$$^{-4}$$

Question 20

Which of the following is the correct symbol for the element with atomic number 53?

Accepted Answer

I

General Chemistry Study Guide: Measurement, Matter, Atomic Structure, and Electron Configuration

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