Question 1

Which of the following statements 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

What is the correct number of significant figures in the measurement shown on the ruler in the image provided?

Accepted Answer

$$2.87 cm$$

Question 3

A graduated cylinder contains a liquid as shown in the image provided. What is the correct reading of the meniscus, with the appropriate number of significant figures?

Accepted Answer

$$4.05 mL$$

Question 4

Which of the following is an example of a heterogeneous mixture?

Accepted Answer

Milk with fruit

Question 5

Which scientist is credited with discovering the electron using the cathode ray tube experiment?

Accepted Answer

Thomson

Question 6

Convert $$1.2 	imes 10^6$ microseconds to seconds using dimensional analysis.

Accepted Answer

$$1.2 s$$

Question 7

Which of the following is an intensive property?

Accepted Answer

Density

Question 8

A sample of isopropyl alcohol has a mass of $$3.93 	imes 10^3$ mg and a volume of 5.00$ mL. What is its density in g/mL$?

Accepted Answer

$$0.786 g/mL$$

Question 9

Which of the following elements is a metalloid?

Accepted Answer

Silicon

Question 10

Which of the following best describes the difference between an atom and an ion?

Accepted Answer

An ion has a different number of electrons than protons, while an atom has equal numbers of protons and electrons.

Question 11

Calculate the kinetic energy in kilojoules of a car with a mass of $$3670 kg $$moving at $$35.76 m/s. $$Use $$E_K = \frac{1}{2}mv^2$.

Accepted Answer

$$2.35 	imes 10^3$ kJ

Question 12

Which of the following is the correct formula for copper(II) phosphate?

Accepted Answer

$$Cu_3$$($$PO_4)_2$

Question 13

Which of the following is a physical property?

Accepted Answer

Sugar dissolves in water

Question 14

Which of the following is the correct name for $$N_2O_4$$?

Accepted Answer

Dinitrogen tetroxide

Question 15

Which of the following is the correct SI prefix for $$10^{-9}$$?

Accepted Answer

nano

Question 16

Which of the following is a chemical change?

Accepted Answer

Iron rusting

Question 17

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 18

Which of the following is the correct formula for the hydrate copper(II) sulfate pentahydrate?

Accepted Answer

$$CuSO_4$$ \cdot 5H_2O$$

Question 19

Which of the following is the correct name for $$HNO_3$$?

Accepted Answer

Nitric acid

General Chemistry Exam 1 Comprehensive Study Guide

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