Practice MC Questions

Question 1

what is represented by subscripts of empirical formulas?

Answer 1

simplest ratio of atoms in each molecule

Question 2

true or false: the law of definite proportions states that a compound always has the same proportion of elements by mass

Answer 2

true

Question 3

True or false: % composition is the percentage by number of each element in a compound

Answer 3

false

Question 4

True or false: If molecules of ethanoic acid contain 2 carbon atoms, 4 hydrogen atoms, and 2 oxygen atoms, the molecular formula for this compound could be written as C2H4O2

Answer 4

true

Question 5

True or false: the ratio used to convert amount of product to mass has unit of mol/g

Answer 5

false

Question 6

true or false

Avogadro’s constant is the number of entities per
gram.

Answer 6

false

Question 7

true or false

A mole of one element has the same mass as a mole of another element.

Answer 7

false

Question 8

true or false

The empirical and molecular formulas for CO2 are
identical.

Answer 8

true

Question 9

true or false

Stoichiometry is the area of chemistry that deals
with qualitative relationships among reactants and
products.

Answer 9

false