Q: Which of the following is a correct statement about scientific notation?

$0.00056$ written in scientific notation is $5.6 \times 10^{-4}$

Question 1

Which of the following best describes a physical change?

Accepted Answer

Dissolving table salt in water

Question 2

A student separates a mixture of sand and salt by first adding water, then filtering, and finally evaporating the filtrate. Which separation techniques are used in this process?

Accepted Answer

Filtration and evaporation

Question 3

Which statement about Dalton’s Atomic Theory is NOT correct according to modern understanding?

Accepted Answer

Atoms of the same element have identical properties

Question 4

A sample contains 60% $^{35}\mathrm{Cl}$ and 40% $^{37}\mathrm{Cl}$. What is the average atomic mass of chlorine? ($^{35}\mathrm{Cl}$ = 34.97 amu, $^{37}\mathrm{Cl}$ = 36.97 amu)

Accepted Answer

$35.57\ \mathrm{amu}$

Question 5

Which of the following is a chemical property?

Accepted Answer

Reactivity with acid

Question 6

A compound contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is its empirical formula?

Accepted Answer

$\mathrm{CH}_2\mathrm{O}$

Question 7

Which of the following pairs of elements are both diatomic in their natural state?

Accepted Answer

Nitrogen and Oxygen

Question 8

A student measures the mass of a liquid as $12.5\ \mathrm{g}$ and its volume as $8.0\ \mathrm{mL}$. What is the density of the liquid?

Accepted Answer

$1.56\ \mathrm{g/mL}$

Question 9

Which of the following is NOT a correct statement about ions?

Accepted Answer

An atom that gains electrons becomes a cation

Question 10

Which of the following is the correct formula for ammonium sulfate?

Accepted Answer

$\mathrm{(NH_4)_2SO_4}$

Question 11

A sample contains $2.0\ \mathrm{mol}$ of $\mathrm{NaCl}$. How many formula units of $\mathrm{NaCl}$ are present? ($N_A = 6.022 	imes 10^{23}\ \mathrm{mol}^{-1}$)

Accepted Answer

$1.204 	imes 10^{24}$

Question 12

Which of the following best explains the result of Rutherford’s gold foil experiment?

Accepted Answer

Atoms are mostly empty space with a small, dense nucleus

Question 13

Which of the following is a correct statement about isotopes?

Accepted Answer

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

Question 14

Which of the following is the correct electron configuration for a neutral oxygen atom?

Accepted Answer

$1s^2\ 2s^2\ 2p^4$

Question 15

A student needs to convert $25.0\ \mathrm{cm}$ to inches. (Given: $1\ \mathrm{in} = 2.54\ \mathrm{cm}$) What is the correct value in inches?

Accepted Answer

$9.84\ \mathrm{in}$

Question 16

Which of the following is a correct statement about scientific notation?

Accepted Answer

$0.00056$ written in scientific notation is $5.6 	imes 10^{-4}$

Question 17

Which of the following compounds contains both ionic and covalent bonds?

Accepted Answer

$\mathrm{NaNO_3}$

Question 18

A $5.00\ \mathrm{g}$ sample of methane ($\mathrm{CH_4}$) is burned in excess oxygen. How many grams of $\mathrm{CO_2}$ are produced? ($\mathrm{CH_4} + 2\mathrm{O_2} \rightarrow \mathrm{CO_2} + 2\mathrm{H_2O}$; molar masses: $\mathrm{CH_4} = 16.0\ \mathrm{g/mol}$, $\mathrm{CO_2} = 44.0\ \mathrm{g/mol}$)

Accepted Answer

$13.8\ \mathrm{g}$

Question 19

Which of the following is the correct name for $\mathrm{FeCl_3}$?

Accepted Answer

Iron(III) chloride

Question 20

Which of the following is NOT a diatomic element?

Accepted Answer

Sulfur

General Chemistry Exam Study Guide: Chapters 1–3

Study Guide - Practice Questions

Study Guide - Flashcards