Question 1

An isotope of a given element has a mass number equal to twice the atomic number.This neutral isotope contains twelve electrons.This isotope is _____ .

Accepted Answer

A)  magnesium-12. 
B)  magnesium-24. 
C)  chromium-24. 
D)  chromium-12. 
A)  magnesium-12. 
B)  magnesium-24. 
C)  chromium-24. 
D)  chromium-12.

Question 2

Atoms are neutral.How can they have no charge?

Accepted Answer

A)  equal numbers of protons and neutrons 
B)  equal numbers of protons and electrons 
C)  equal numbers of neutrons and electrons 
D)  any charge has been drained out of the atom 
A)  equal numbers of protons and neutrons 
B)  equal numbers of protons and electrons 
C)  equal numbers of neutrons and electrons 
D)  any charge has been drained out of the atom

Question 3

How many carbon atoms are contained in 5.50 g of ethane,C2H6?

Accepted Answer

A)  2.75 *10-22 
B)  3.29 * 1024 
C)  1.10 * 1023 
D)  2.21 * 1023 
A)  2.75 *10-22 
B)  3.29 * 1024 
C)  1.10 * 1023 
D)  2.21 * 1023

Question 4

One mole of O3 weighs 16 grams.

Accepted Answer

A) True 
 B)False

Question 5

The symbol for bromine is _____ .

Accepted Answer

A)  B 
B)  Br 
C)  Be 
D)  none of these 
A)  B 
B)  Br 
C)  Be 
D)  none of these

Question 6

If calcium carbonate found in limestone is 40.0% calcium,how many grams of calcium are in 485 g of calcium carbonate?

Accepted Answer

A)  12.1 g of calcium 
B)  291 g of calcium 
C)  19,400 g of calcium 
D)  194 g of calcium 
A)  12.1 g of calcium 
B)  291 g of calcium 
C)  19,400 g of calcium 
D)  194 g of calcium

Question 7

Which of the following carries a negative charge?

Accepted Answer

A)  a proton 
B)  a neutron 
C)  an electron 
D)  both proton and neutron 
A)  a proton 
B)  a neutron 
C)  an electron 
D)  both proton and neutron

Question 8

Isotopes of the same element always have the same atomic number.

Accepted Answer

A) True 
 B)False

Question 9

What is the number of moles of water in one liter of water if one gram of water takes up one milliliter of space?

Accepted Answer

A)  1 
B)  18 
C)  55.6 
D)  1000 
A)  1 
B)  18 
C)  55.6 
D)  1000

Question 10

Isotopes of the same element always have the same number of neutrons.

Accepted Answer

A) True 
 B)False

Question 11

What is the meaning of the two (2)in ethyl alcohol,C2H5OH?

Accepted Answer

A)  all alcohol molecules contain two carbon atoms 
B)  there are two carbon atoms per molecule of ethyl alcohol 
C)  carbon is diatomic 
D)  all of these are correct statements 
A)  all alcohol molecules contain two carbon atoms 
B)  there are two carbon atoms per molecule of ethyl alcohol 
C)  carbon is diatomic 
D)  all of these are correct statements

Question 12

The symbols for elements with accepted names

Accepted Answer

A)  consist of a single capital letter. 
B)  consist of a capital letter and a small letter. 
C)  consist of either a single capital letter or a capital letter and a small letter. 
D)  No answer is correct. 
A)  consist of a single capital letter. 
B)  consist of a capital letter and a small letter. 
C)  consist of either a single capital letter or a capital letter and a small letter. 
D)  No answer is correct.

Question 13

One mole of an element would weigh the same as a mole of an isotope of the same element.

Accepted Answer

A) True 
 B)False

Question 14

How many neutrons are found in the nucleus of a boron-11 (11B)atom?

Accepted Answer

A)  11 
B)  6 
C)  5 
D)  4 
A)  11 
B)  6 
C)  5 
D)  4

Question 15

Protons and neutrons have approximately the same mass.

Accepted Answer

A) True 
 B)False

Question 16

One mole of an element would weigh the same as a mole of an isotope of the same element.

Accepted Answer

A) True 
 B)False

Question 17

The charge of the nucleus depends only on the atomic number.

Accepted Answer

A) True 
 B)False

Question 18

How many moles of Na2Cr2O7 contain 14 moles of oxygen atoms?

Accepted Answer

A)  2 mol Na2Cr2O7 
B)  14 mol Na2Cr2O7 
C)  7 mol Na2Cr2O7 
D)  1 mol Na2Cr2O7 
A)  2 mol Na2Cr2O7 
B)  14 mol Na2Cr2O7 
C)  7 mol Na2Cr2O7 
D)  1 mol Na2Cr2O7

Question 19

What mass of arsenic (As)in grams contains the same number of atoms as 39.95 g of argon (Ar)?

Accepted Answer

A)  33.0 
B)  74.92 
C)  4.16 
D)  149.84 
A)  33.0 
B)  74.92 
C)  4.16 
D)  149.84

Question 20

Neutral isotopes of the same element have the same number of electrons.

Accepted Answer

A) True 
 B)False

Exam 2: Atoms and Molecules

An isotope of a given element has a mass number equal to twice the atomic number.This neutral isotope contains twelve electrons.This isotope is _____ .

Atoms are neutral.How can they have no charge?

How many carbon atoms are contained in 5.50 g of ethane,C2H6?

One mole of O3 weighs 16 grams.

The symbol for bromine is _____ .

If calcium carbonate found in limestone is 40.0% calcium,how many grams of calcium are in 485 g of calcium carbonate?

Which of the following carries a negative charge?

Isotopes of the same element always have the same atomic number.

What is the number of moles of water in one liter of water if one gram of water takes up one milliliter of space?

Isotopes of the same element always have the same number of neutrons.

What is the meaning of the two (2)in ethyl alcohol,C2H5OH?

The symbols for elements with accepted names

One mole of an element would weigh the same as a mole of an isotope of the same element.

How many neutrons are found in the nucleus of a boron-11 (11B)atom?

Protons and neutrons have approximately the same mass.

One mole of an element would weigh the same as a mole of an isotope of the same element.

The charge of the nucleus depends only on the atomic number.

How many moles of Na2Cr2O7 contain 14 moles of oxygen atoms?

What mass of arsenic (As)in grams contains the same number of atoms as 39.95 g of argon (Ar)?

Neutral isotopes of the same element have the same number of electrons.

Matter, measurements, and Calculations

Electronic Structure and the Periodic Law

Forces Between Particles

Chemical Reactions

The States of Matter

Solutions and Colloids

Reaction Rates and Equilibrium

Acids,bases,and Salts

Radioactivity and Nuclear Processes

Organic Compounds: Alkanes

Unsaturated Hydrocarbons

Alcohols, phenols, and Ethers

Aldehydes and Ketones

Carboxylic Acids and Esters

Amines and Amides

Carbohydrates

Lipids

Proteins

Enzymes

Nucleic Acids and Protein Synthesis

Nutrition and Energy for Life

Carbohydrate Metabolism

Lipid and Amino Acid Metabolism

Body Fluids

Filters

How many carbon atoms are contained in 5.50 g of ethane,C₂H₆?

One mole of O₃ weighs 16 grams.

What is the meaning of the two (2)in ethyl alcohol,C₂H₅OH?

How many neutrons are found in the nucleus of a boron-11 (¹¹B)atom?

How many moles of Na₂Cr₂O₇ contain 14 moles of oxygen atoms?