Question 1

Nitrogen and oxygen combine to form several different nitrogen oxides. In one case, 8.4 g of nitrogen reacted completely with 4.8 g of oxygen. In another case, 4.2 g of nitrogen reacted with 9.6 g of oxygen. Which pair of nitrogen oxides is consistent with these data?

Accepted Answer

A) NO and N2O 
B) NO and NO2 
C) N2O and N2O5 
D) NO and N2O4 
E) N2O and N2O4

Question 2

Identify the letter of the group that contains the most metalloids.

Accepted Answer

A) A 
B) B 
C) C 
D) D 
E) E

Question 3

Which statement is not correct?

Accepted Answer

A) Electrons have a negative electrical charge. 
B) Protons have a positive electrical charge. 
C) Neutrons do not have an electrical charge. 
D) In an atom, the interaction between electrons and protons is attractive. 
E) In an atom, the interaction between electrons and neutrons is repulsive.

Question 4

Give an example of a metalloid (a.k.a semimetal).

Accepted Answer

The answer of Give an example of a metalloid (a.k.a...

Question 5

Hypochlorous acid has the formula ________

Accepted Answer

A) HClO4. 
B) HClO3. 
C) HClO2. 
D) HClO. 
E) H2ClO2.

Question 6

The emission of a $\beta$ particle is associated with the ________

Accepted Answer

A) conversion of a neutron to a proton. 
B) conversion of a proton to a neutron. 
C) increase in mass number. 
D) decrease in mass number. 
E) formation of an isotope.

Question 7

Locate each element in the periodic table and identify which statement is not correct. The common ion of ________ has ________ electrons and a charge of ________.

Accepted Answer

A) Na; 10; +1 
B) K; 18; +1 
C) Mg; 10; +2 
D) O; 10; -2 
E) F; 10; -2

Question 8

Which one of the following is an ionic compound?

Accepted Answer

A) SO2 
B) ClO2 
C) H2O 
D) TiO2 
E) CO2

Question 9

Give an example of a transition metal.

Accepted Answer

The answer of Give an example of a transition metal....

Question 10

There are three major isotopes of silicon: silicon-28, silicon-29, and silicon-30. Given the average atomic mass of silicon is 28.10 amu, estimate the percent abundance of the most abundant isotope of silicon.

Accepted Answer

A) 8% 
B) 20% 
C) 66% 
D) 80% 
E) 92%

Question 11

What is the empirical formula for dioxane, C4H8O2?

Accepted Answer

A) CHO 
B) C4H8O2 
C) C2H4O 
D) CH2O 
E) CHO2

Question 12

Which one of the following acids is not named correctly?

Accepted Answer

A) H2SO3, sulfurous acid 
B) H2S, hydrosulfuric acid 
C) H3PO3, phosphoric acid 
D) HBr, hydrobromic acid 
E) HNO3, nitric acid

Question 13

Radium often is found in uranium ores and can be separated from solutions by precipitation as radium sulfate. What is the formula for radium sulfate?

Accepted Answer

A) RnSO4 
B) RaSO4 
C) Rn2SO3 
D) Ra2SO4 
E) Ra(SO4)2

Question 14

In the atoms in the Rutherford-Geiger-Marsden experiment, the alpha particles were repelled by ________

Accepted Answer

A) electrons. 
B) protons. 
C) neutrons. 
D) nuclei. 
E) gravity.

Question 15

Which statement about isotopes of the same element is not correct?

Accepted Answer

A) They have the same number of protons. 
B) They have different numbers of neutrons. 
C) They have essentially the same chemical properties. 
D) They have the same atomic mass. 
E) They have the same number of electrons.

Question 16

Enriched weapons-grade uranium consists of 80% uranium-235 (235.044 amu) and 20% uranium-238 (238.051 amu). What is the average atomic mass of weapons-grade uranium, assuming the percentages are exact?

Accepted Answer

A) 235.044 amu 
B) 236.547 amu 
C) 238.051 amu 
D) 235.645 amu 
E) 235.754 amu

Question 17

The following salts are used in fireworks. Which one has an incorrect formula or is not named correctly?

Accepted Answer

A) Li2CO3, lithium carbonate 
B) CaSO4, calcium sulfate 
C) BaNO3, barium nitrate 
D) CuO, copper(II) oxide 
E) NH4Cl, ammonium chloride

Question 18

Which one of the following acids has an incorrect formula or is not named correctly?

Accepted Answer

A) HI, hydroiodic acid 
B) H2CO3, carbonic acid 
C) HNO3, nitric acid 
D) H2SO3, sulfuric acid 
E) H3PO4, phosphoric acid

Question 19

What is the correct name for PbS₂?

Accepted Answer

The answer of What is the correct name for PbS₂?...

Question 20

Which one of the following acids has an incorrect formula or is not named correctly?

Accepted Answer

A) HCl, hydrochloric acid 
B) HF, hydrofluoric acid 
C) HNO2, nitric acid 
D) H2CO3, carbonic acid 
E) H2SO4, sulfuric acid

Exam 2: Atoms, Ions, and Molecules: Matter Starts Here

Nitrogen and oxygen combine to form several different nitrogen oxides. In one case, 8.4 g of nitrogen reacted completely with 4.8 g of oxygen. In another case, 4.2 g of nitrogen reacted with 9.6 g of oxygen. Which pair of nitrogen oxides is consistent with these data?

Identify the letter of the group that contains the most metalloids.

Which statement is not correct?

Give an example of a metalloid (a.k.a semimetal).

Hypochlorous acid has the formula ________

The emission of a $\beta$ particle is associated with the ________

Locate each element in the periodic table and identify which statement is not correct. The common ion of has electrons and a charge of .

Which one of the following is an ionic compound?

Give an example of a transition metal.

There are three major isotopes of silicon: silicon-28, silicon-29, and silicon-30. Given the average atomic mass of silicon is 28.10 amu, estimate the percent abundance of the most abundant isotope of silicon.

What is the empirical formula for dioxane, C₄H₈O₂?

Which one of the following acids is not named correctly?

Radium often is found in uranium ores and can be separated from solutions by precipitation as radium sulfate. What is the formula for radium sulfate?

In the atoms in the Rutherford-Geiger-Marsden experiment, the alpha particles were repelled by ________

Which statement about isotopes of the same element is not correct?

Enriched weapons-grade uranium consists of 80% uranium-235 (235.044 amu) and 20% uranium-238 (238.051 amu) . What is the average atomic mass of weapons-grade uranium, assuming the percentages are exact?

The following salts are used in fireworks. Which one has an incorrect formula or is not named correctly?

Which one of the following acids has an incorrect formula or is not named correctly?

What is the correct name for PbS₂?

Which one of the following acids has an incorrect formula or is not named correctly?

Exam 2: Atoms, Ions, and Molecules: Matter Starts Here

Nitrogen and oxygen combine to form several different nitrogen oxides. In one case, 8.4 g of nitrogen reacted completely with 4.8 g of oxygen. In another case, 4.2 g of nitrogen reacted with 9.6 g of oxygen. Which pair of nitrogen oxides is consistent with these data?

Identify the letter of the group that contains the most metalloids.

Which statement is not correct?

Give an example of a metalloid (a.k.a semimetal).

Hypochlorous acid has the formula ________

The emission of a β\betaβ particle is associated with the ________

Locate each element in the periodic table and identify which statement is not correct. The common ion of ________ has ________ electrons and a charge of ________.

Which one of the following is an ionic compound?

Give an example of a transition metal.

There are three major isotopes of silicon: silicon-28, silicon-29, and silicon-30. Given the average atomic mass of silicon is 28.10 amu, estimate the percent abundance of the most abundant isotope of silicon.

What is the empirical formula for dioxane, C4H8O2?

Which one of the following acids is not named correctly?

Radium often is found in uranium ores and can be separated from solutions by precipitation as radium sulfate. What is the formula for radium sulfate?

In the atoms in the Rutherford-Geiger-Marsden experiment, the alpha particles were repelled by ________

Which statement about isotopes of the same element is not correct?

Enriched weapons-grade uranium consists of 80% uranium-235 (235.044 amu) and 20% uranium-238 (238.051 amu) . What is the average atomic mass of weapons-grade uranium, assuming the percentages are exact?

The following salts are used in fireworks. Which one has an incorrect formula or is not named correctly?

Which one of the following acids has an incorrect formula or is not named correctly?

What is the correct name for PbS2?

Which one of the following acids has an incorrect formula or is not named correctly?

The emission of a $\beta$ particle is associated with the ________

Locate each element in the periodic table and identify which statement is not correct. The common ion of has electrons and a charge of .

What is the empirical formula for dioxane, C₄H₈O₂?

What is the correct name for PbS₂?