Exam review 2

When naming acids, the prefix hydro- is used when the name of the acid anion ends in ___

• -ide

• -ite

• -ate

• -ic

What SI unit is used to measure the number of representative particles in a substance?

• kilogram

• ampere

• kelvin

• mole

Which of the following elements exists as a diatomic molecule?

• neon

• lithium

• nitrogen

• sulfur

What is the mass in grams of 5.90 mol C8H18

• 0.0512g

• 19.4g

• 389g

• 673g

The volume of one mole of a substance is 22.4L at STP for all

• gases

• liquids

• solids

• compounds

If 60.2 grams of Hg combines completely with 24.0 grams of Br to form a compound, what is the percent composition of Hg in the compound?

• 28.5%

• 39.9%

• 71.5%

• 60.1%

What is the empirical formula of a compound that is 40% sulfur and 60% oxygen by weight?

• SO

• SO2

• SO3

• S6O4

Which of the following is NOT true about empirical and molecular formulas?

• The molecular formula of a compound can be the same as its empirical formula.

• The molecular formula of a compound can be some whole-number multiple of its empirical formula.

• Several compounds can have the same empirical formula, but have different molecular formulas.

• The empirical formula of a compound can be triple its molecular formula.

A skeleton equation does NOT show which of the following?

• 1. the correct formulas of the reactants and products

• 1. the reactants on the left, the products on the right

• 1. an arrow connecting the reactants to the products

• 1. the relative amounts of reactants and products

Chemical equations must be balanced to satisfy ____

• the law of definite proportions

• the law of multiple proportions

• the law of conservation of mass

• Avogadro's principle