chem final review - chapter 5

the first chemist to formally state the law of constant composition was:

• rutherford

• proust

• mendeleev

• dalton

the law of constant composition states:

• all samples of a given compound have the same proportions of their constituent elements

• the nucleus is a dense region of positive charge that always contains protons and neutrons

• matter cannot be created or destroyed in a chemical reaction

• all atoms of a given element have a constant composition and are different than atoms of any other element

what is the oxygen-to-hydrogen mass ration for H₂O₂?

• 0.125

• 8

• 16

• 4

the phosphorous-to-hydrogen mass ratio is 10.2 for a compound. this ratio could correspond to the compound:

• PH₃

• PH₆

• PH

• PH₂

how many total atoms are in the formula Al₂(CO₃)₃?

• 14

• 9

• 12

• 8

how many carbon atoms are in the formula Al₂(CO₃)₃?

• 1

• 6

• 9

• 3

• none of the above

How many of each type of atoms are there in the formula NH₄C₂H₃O₂?

• N =1, H = 3, C = 2, O =2

• N = 1, H = 7, C = 2, O =2

• N = 4, H = 7, C = 2, O = 2

• N = 1, H = 3, C = 2, O =2

what is the correct formula of a compound that has ten oxygen atoms and four phosphorous atoms?

• O₁₀P₄

• P₄O₁₀

• 10OP₄

• 4PO₁₀

carbon monoxide is considered which of the following?

• molecular compound

• ionic compound

• atomic element

• none of the above

fluorine is considered which of the following?

• molecular element

• molecular compound

• ionic compound

• atomic element