Question 1

Which of the following best describes the difference between a scientific law and a scientific theory?

Accepted Answer

A scientific law is a summary of observed behavior, while a scientific theory provides an explanation for that behavior.

Question 2

A student measures the mass of a sample three times and records the values: 5.12 g, 5.13 g, and 5.11 g. The true mass is 5.50 g. Which statement best describes the measurements?

Accepted Answer

The measurements are precise but not accurate.

Question 3

Which of the following is an example of an exothermic process?

Accepted Answer

Combustion of gasoline in a car engine

Question 4

A sample of gold has a mass of 96.5 g and a volume of 5.00 cm$$^3. $$What is the density of gold in g/cm$$^3$$?

Accepted Answer

$$19.3$$

Question 5

Which of the following laboratory glassware would be most appropriate for measuring exactly 25.00 mL of a solution?

Accepted Answer

Volumetric pipette

Question 6

Which of the following is a chemical property?

Accepted Answer

Flammability

Question 7

A student needs to convert 350 K to degrees Celsius. Which equation should they use, and what is the answer?

Accepted Answer

$$^\circ C = K - 273.15;\ ^\circ C = 76.85$$

Question 8

Which of the following best describes a heterogeneous mixture?

Accepted Answer

A mixture in which the individual components are not evenly distributed

Question 9

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.

Question 10

A sample contains 75.0% $$^{35}Cl ($$mass = 34.97 amu) and 25.0% $$^{37}Cl ($$mass = 36.97 amu). What is the atomic mass of chlorine?

Accepted Answer

$$35.5$$ amu

Question 11

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

Accepted Answer

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

Question 12

Which of the following best describes the Law of Conservation of Mass?

Accepted Answer

The total mass of reactants equals the total mass of products in a chemical reaction.

Question 13

A student is asked to solve for mass ($$m) in $$the equation $$q = mc\Delta T. $$Which rearrangement is correct?

Accepted Answer

$$m = \dfrac{q}{c\Delta T}$$

Question 14

Which of the following elements is a main-group element?

Accepted Answer

Sodium (Na)

Question 15

Which of the following is NOT a correct safety practice in the chemistry laboratory?

Accepted Answer

Pipetting by mouth to avoid contamination

Question 16

Which of the following is a physical change?

Accepted Answer

Boiling water to produce steam

Question 17

A student records the temperature of a solution as 25.0 $$^\circC. $$What is this temperature in Kelvin?

Accepted Answer

$$298.15 K$$

Question 18

Which of the following statements about ions is correct?

Accepted Answer

An anion has more electrons than protons.

Question 19

Which of the following is the correct number of significant figures in the measurement 0.004560?

Accepted Answer

4

Question 20

A solution is prepared by dissolving 10.0 g of salt in 90.0 g of water. Which term best describes the resulting mixture?

Accepted Answer

Homogeneous mixture

General Chemistry Curriculum Map: Key Concepts and Study Guide

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