Question 1

Which of the following is the correct chemical symbol for the element with 19 protons?

Accepted Answer

K

Question 2

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

Accepted Answer

A compound consists of two or more different elements chemically combined, while an element consists of only one type of atom.

Question 3

A student measures the mass of a sample as 0.00230 g. How many significant figures does this measurement have?

Accepted Answer

3

Question 4

Which of the following is a chemical change?

Accepted Answer

The process in plants that converts carbon dioxide to sugar

Question 5

Express 0.000097 as a number in scientific notation.

Accepted Answer

$$9.7 	imes 10$$^{-5}$$

Question 6

Which of the following best represents a mixture?

Accepted Answer

An egg

Question 7

A block has dimensions of $$5.0\ \mathrm{cm} 	imes 2.0\ \mathrm{cm} 	imes 3.0\ \mathrm{cm}$$ and a mass of $$60.0\ \mathrm{g}. $$What is its density in $$\mathrm{g/cm}^3$$?

Accepted Answer

$$2.0\ \mathrm{g/cm}^3$$

Question 8

Which of the following is the correct formula for carbon monoxide?

Accepted Answer

CO

Question 9

Solve for $$x in $$the equation $$2x + 4 = 14.$$

Accepted Answer

$$x = 5$$

Question 10

Which of the following best describes the arrangement of particles in a solid, liquid, and gas, respectively?

Accepted Answer

Closely packed and fixed; closely packed but able to move; far apart and moving freely

Question 11

A sample contains $$2.0 	imes 10^3$ mL. Express this volume in liters.

Accepted Answer

$$2.0 L$$

Question 12

Which of the following is the correct rearrangement of the density equation $$d = \frac{m}{V} to $$solve for $$V$$?

Accepted Answer

$$V = \frac{m}{d}$$

Question 13

A student rounds the number 0.08250873 to three significant figures. What is the correct result?

Accepted Answer

0.0825

Question 14

Which of the following is the correct answer to $$(3.24 	imes 10^4$) + (2.40 	imes 10^3$)$$, expressed in scientific notation with the correct number of significant figures?

Accepted Answer

$$5.6 	imes 10^4$

Question 15

Which of the following best describes a physical change?

Accepted Answer

Dissolving sugar in water

Question 16

If a measurement is recorded as 645 mL, how many significant figures does it have?

Accepted Answer

3

Question 17

A solution is prepared by dissolving 5.0 g of salt in 95.0 g of water. Which of the following best describes the resulting mixture?

Accepted Answer

Mixture

Question 18

Which of the following is the correct value for $$(2.0 	imes 10^3$) 	imes (4.0 	imes 10^2$)$$?

Accepted Answer

$$8.0 	imes 10^4$

Question 19

Which of the following is the correct chemical formula for a molecule containing two nitrogen atoms?

Accepted Answer

N$$_2$$

CHEM 107: Problem Solving and Fundamental Concepts (Ch. 1–4) Study Guide

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드