Question 1

Determine the number of electrons and protons in the element Tc.

Accepted Answer

A) 43 protons,43 electrons 
B) 43 protons,56 electrons 
C) 56 protons,43 electrons 
D) 99 protons,43 electrons 
A) 43 protons,43 electrons 
B) 43 protons,56 electrons 
C) 56 protons,43 electrons 
D) 99 protons,43 electrons

Question 2

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 3

Determine the molecular weight of hydrogen peroxide,H2O2,in u (or amu).

Accepted Answer

A) 17.01 
B) 18.02 
C) 34.02 
D) 33.01 
A) 17.01 
B) 18.02 
C) 34.02 
D) 33.01

Question 4

Oxalic acid is found in many plants,like spinach and black tea.What is the mass of the carbon found in one mole of oxalic acid,H2C2O4?

Accepted Answer

A) 12.01 g of C 
B) 24.02 g of Cl 
C) 45.01 g of C 
D) 90.02 g of C 
A) 12.01 g of C 
B) 24.02 g of Cl 
C) 45.01 g of C 
D) 90.02 g of C

Question 5

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 6

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 7

The system of atomic mass units is based on

Accepted Answer

A) assigning 12C as weighing exactly 12 u & comparing other elements to it. 
B) measuring the true mass of each subatomic particle. 
C) comparing the differences in protons and electrons. 
D) viewing how atoms are affected by electromagnetic fields. 
A) assigning 12C as weighing exactly 12 u & comparing other elements to it. 
B) measuring the true mass of each subatomic particle. 
C) comparing the differences in protons and electrons. 
D) viewing how atoms are affected by electromagnetic fields.

Question 8

How many neutrons are in an atom that has a mass number of 75 and contains 35 protons?

Accepted Answer

A) 40 
B) 35 
C) 75 
D) can't tell 
A) 40 
B) 35 
C) 75 
D) can't tell

Question 9

Refer to a periodic table and tell how many helium atoms (He)would be needed to get close to the same mass as an average oxygen atom (O).

Accepted Answer

A) six 
B) four 
C) twelve 
D) one-fourth 
A) six 
B) four 
C) twelve 
D) one-fourth

Question 10

One mole of any substance will contain one Avogadro's number of atoms of that substance.

Accepted Answer

A) True 
 B)False

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

How many moles of hydrogen molecules (H2)would be required to produce two moles of hydrogen peroxide (H2O2)?

Accepted Answer

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

Question 13

The weight % of S in K2SO4 is _____ .

Accepted Answer

A) 14.2% 
B) 18.4% 
C) 54.4% 
D) 22.4% 
A) 14.2% 
B) 18.4% 
C) 54.4% 
D) 22.4%

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

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 16

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 17

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

Accepted Answer

A) True 
 B)False

Question 18

Which element is approximately 65 percent of sulfuric acid by weight?

Accepted Answer

A) hydrogen 
B) sulfur 
C) oxygen 
D) any of these 
A) hydrogen 
B) sulfur 
C) oxygen 
D) any of these

Question 19

Protons and neutrons have approximately the same mass.

Accepted Answer

A) True 
 B)False

Question 20

Why is CaO the symbol for calcium oxide instead of CAO?

Accepted Answer

A) both can be the symbols for calcium oxide 
B) both are incorrect; the symbol is cao 
C) a capital letter means a new symbol 
D) both are incorrect as the symbol should be CaOx 
A) both can be the symbols for calcium oxide 
B) both are incorrect; the symbol is cao 
C) a capital letter means a new symbol 
D) both are incorrect as the symbol should be CaOx

Exam 2: Atoms and Molecules

Determine the number of electrons and protons in the element Tc.

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

Determine the molecular weight of hydrogen peroxide,H2O2,in u (or amu).

Oxalic acid is found in many plants,like spinach and black tea.What is the mass of the carbon found in one mole of oxalic acid,H2C2O4?

Atoms are neutral.How can they have no charge?

Which of the following carries a negative charge?

The system of atomic mass units is based on

How many neutrons are in an atom that has a mass number of 75 and contains 35 protons?

Refer to a periodic table and tell how many helium atoms (He)would be needed to get close to the same mass as an average oxygen atom (O).

One mole of any substance will contain one Avogadro's number of atoms of that substance.

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

How many moles of hydrogen molecules (H2)would be required to produce two moles of hydrogen peroxide (H2O2)?

The weight % of S in K2SO4 is _____ .

How many hydrogen atoms are in 1.00 mole of NH3?

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

The symbol for bromine is _____ .

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

Which element is approximately 65 percent of sulfuric acid by weight?

Protons and neutrons have approximately the same mass.

Why is CaO the symbol for calcium oxide instead of CAO?

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?

Determine the molecular weight of hydrogen peroxide,H₂O₂,in u (or amu).

Oxalic acid is found in many plants,like spinach and black tea.What is the mass of the carbon found in one mole of oxalic acid,H₂C₂O₄?

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

How many moles of hydrogen molecules (H₂)would be required to produce two moles of hydrogen peroxide (H₂O₂)?

The weight % of S in K₂SO₄ is _____ .

How many hydrogen atoms are in 1.00 mole of NH₃?

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