AP Chemistry exam!!! Have fun!?

Question

1. Aqueous solutions of Nickel(II)Sulfate and Barium Chloride are combined. What precipitate (if any) will form as a result of this reaction?

a. Nickel(II)Chloride

b. Barium Sulfate

c. No precipitate will form.

2. True or False: In order to determine the molecular formula of a compound from the empirical formula, the molar mass of the compound has to be known.

a. True

b. False

3. In the combustion reaction of Octane (C8H18 with molecular Oxygen (O2) to produce Carbon Dioxide and Water Vapor, what is the mole ratio of Oxygen to Octane?

a. 2 to 1

b. 8 to 1

c. 25 to 2

d. 9 to 1

4. How many p electrons are contained in the valence (outermost) electrons surrounding a neutral atom of a Halogen?

a. 6

b. None

c. 4

d. 2

e. 5

5. When two oxygen atoms combine to form a diatomic molecule (molecular oxygen), which of the following would best describe the type of intramolecular bond that binds the molecule together.

a. Ionic

b. Polar Covalent

c. Covalent

Answer 1

1. Aqueous solutions of Nickel(II)Sulfate and Barium Chloride are combined. What precipitate (if any) will form as a result

b. Barium Sulfate

2. True or False: In order to determine the molecular formula of a compound from the empirical formula, the molar mass of the compound has to be known.

a. True

3. In the combustion reaction of Octane (C8H18 with molecular Oxygen (O2) to produce Carbon Dioxide and Water Vapor, what is the mole ratio of Oxygen to Octane?

2C8H18  & 25 O2 --> 18 H2O & 16 CO2

c. 25 to 2

4. How many p electrons are contained in the valence (outermost) electrons surrounding a neutral atom of a Halogen?

e. 5

5. When two oxygen atoms combine to form a diatomic molecule (molecular oxygen), which of the following would best describe the type of intramolecular bond that binds the molecule together.

c. Covalent