Question 1

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

Accepted Answer

A) True 
 B)False

Question 2

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 3

What is the weight percentage of nitrogen in urea, CN2H4O?

Accepted Answer

A) 46.7 
B) 30.4 
C) 32.6 
D) 16.3 
A) 46.7 
B) 30.4 
C) 32.6 
D) 16.3

Question 4

The atomic mass number is a whole number and indicates a specific isotope of an element.

Accepted Answer

A) True 
 B)False

Question 5

Write the formula for a compound consisting of 3 sodium atoms, 1 phosphorus atom, and 4 oxygen atoms.

Accepted Answer

A) S3PO4 
B) 3NaP4O 
C) Na3P2(O2) 
D) Na3PO4 
A) S3PO4 
B) 3NaP4O 
C) Na3P2(O2) 
D) Na3PO4

Question 6

​ How many H atoms are there in 6.02 × 1023 H2O molecules?

Accepted Answer

A) 12.04 × 1023  
B) 12.04 × 1046 
C) 6.02 × 1023 
D) 6.020 × 1023 
A) 12.04 × 1023  
B) 12.04 × 1046 
C) 6.02 × 1023 
D) 6.020 × 1023

Question 7

How many moles of N2O contain the same number of nitrogen atoms as 4.60 g of NO2?

Accepted Answer

A) 0.500 
B) 0.0500 
C) 0.100 
D) 0.200 
A) 0.500 
B) 0.0500 
C) 0.100 
D) 0.200

Question 8

The symbols for all of the elements always begin with a capital letter.

Accepted Answer

A) True 
 B)False

Question 9

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 10

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 11

If you have 3.011 × 1023 atoms of carbon, what would you expect its mass to be?

Accepted Answer

A) 12.01 g 
B) 6.005 g 
C) 3.003 g 
D) 1.000 g 
A) 12.01 g 
B) 6.005 g 
C) 3.003 g 
D) 1.000 g

Question 12

The mass of mercury (Hg), a liquid at room temperature, is 200.6 amu\mol. A 200.6 gram sample of mercury is heated until it boils. What is the mass of one mole of mercury vapor (gas)?

Accepted Answer

A) 200.6 or it wouldn’t be a gas 
B) the same as Avogadro's number 
C) the same as when it is a liquid 
D) none of the answers are correct 
A) 200.6 or it wouldn’t be a gas 
B) the same as Avogadro's number 
C) the same as when it is a liquid 
D) none of the answers are correct

Question 13

Isotopes differ from each other in what way?

Accepted Answer

A) They have different numbers of protons in the nucleus. 
B) They have different numbers of neutrons in the nucleus. 
C) They have different numbers of electrons outside the nucleus. 
D) More than one response is correct. 
A) They have different numbers of protons in the nucleus. 
B) They have different numbers of neutrons in the nucleus. 
C) They have different numbers of electrons outside the nucleus. 
D) More than one response is correct.

Question 14

How many hydrogen atoms are in 1.00 mole of NH3?

Accepted Answer

A) 3.00 
B) 6.02 × 1023 
C) 12.0 × 1023 
D) 18.1 × 1023 
A) 3.00 
B) 6.02 × 1023 
C) 12.0 × 1023 
D) 18.1 × 1023

Question 15

Protons and neutrons have approximately the same mass.

Accepted Answer

A) True 
 B)False

Question 16

Individuals, ages 19-70, should include at least 1000 mg of calcium in their daily diet.  What is the minimum number of one-gram calcium supplement tablets you would need to take each day to meet this requirement if a tablet is 40% by mass calcium?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
A) 1 
B) 2 
C) 3 
D) 4

Question 17

Which of the following particles is the smallest?

Accepted Answer

A) proton 
B) electron 
C) neutron 
D) they are all the same size 
A) proton 
B) electron 
C) neutron 
D) they are all the same size

Question 18

What is the reason that U-238 is different from U-235?

Accepted Answer

A) three more electrons 
B) three more protons 
C) three more neutrons 
D) there is no difference 
A) three more electrons 
B) three more protons 
C) three more neutrons 
D) there is no difference

Question 19

Which of the following pairs are about equal in mass?

Accepted Answer

A) proton and electron 
B) electron and neutron 
C) proton and neutron 
D) nucleus and surrounding electrons 
A) proton and electron 
B) electron and neutron 
C) proton and neutron 
D) nucleus and surrounding electrons

Question 20

The formula for dinitrogen monoxide is N2O. If a sample of the oxide was found to contain 0.0800 g of oxygen, how many grams of nitrogen would it contain?

Accepted Answer

A) 0.140 
B) 0.280 
C) 0.560 
D) 0.0700 
A) 0.140 
B) 0.280 
C) 0.560 
D) 0.0700

Exam 2: Atoms and Molecules

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

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

What is the weight percentage of nitrogen in urea, CN2H4O?

The atomic mass number is a whole number and indicates a specific isotope of an element.

Write the formula for a compound consisting of 3 sodium atoms, 1 phosphorus atom, and 4 oxygen atoms.

​ How many H atoms are there in 6.02 × 1023 H2O molecules?

How many moles of N2O contain the same number of nitrogen atoms as 4.60 g of NO2?

The symbols for all of the elements always begin with a capital letter.

Which of the following carries a negative charge?

The symbol for bromine is _____ .

If you have 3.011 × 1023 atoms of carbon, what would you expect its mass to be?

The mass of mercury (Hg), a liquid at room temperature, is 200.6 amu\mol. A 200.6 gram sample of mercury is heated until it boils. What is the mass of one mole of mercury vapor (gas)?

Isotopes differ from each other in what way?

How many hydrogen atoms are in 1.00 mole of NH3?

Protons and neutrons have approximately the same mass.

Individuals, ages 19-70, should include at least 1000 mg of calcium in their daily diet. What is the minimum number of one-gram calcium supplement tablets you would need to take each day to meet this requirement if a tablet is 40% by mass calcium?

Which of the following particles is the smallest?

What is the reason that U-238 is different from U-235?

Which of the following pairs are about equal in mass?

The formula for dinitrogen monoxide is N2O. If a sample of the oxide was found to contain 0.0800 g of oxygen, how many grams of nitrogen would it contain?

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

What is the weight percentage of nitrogen in urea, CN₂H₄O?

How many H atoms are there in 6.02 × 10²³ H₂O molecules?

How many moles of N₂O contain the same number of nitrogen atoms as 4.60 g of NO₂?

If you have 3.011 × 10²³ atoms of carbon, what would you expect its mass to be?

How many hydrogen atoms are in 1.00 mole of NH₃?

The formula for dinitrogen monoxide is N₂O. If a sample of the oxide was found to contain 0.0800 g of oxygen, how many grams of nitrogen would it contain?