Chemistry: Precision and Design - Test 2 (Chapters 3-4) T

What is the simplest ratio of atoms in a compound?

• empirical formula

• molecular formula

• molar mass

• formula weight

What term refers to the numerical relationship between elements and compounds in a reaction?

• conservation of mass

• dimensional analysis

• displacement

• stoichiometry

What law explains why chemical equations must be balanced?

• law of multiple proportions

• law of ionic charge

• law of mole ratios

• law of conservation of mass

What is the value of Avogadro's number?

• 12

• 273.15

• 3.00 x 10⁸

• 6.022 x 10²³

Which of the following tasks can percent composition be used to perform?

• predicting the products of a chemical reaction

• determining whether a compound is molecular or ionic

• calculating a compound's molar mass

• determining a compound's empirical formula

What are the reactants in the following reaction? (4.1) CaOH(aq) + Na₂CO₃(aq) → CaCO₃(s) + NaOH(aq)

• CaOH, CaCO₃

• CaCO₃, NaOH

• CaOH, Na₂CO₃

• Na₂CO₃, NaOH

What is a hydrate?

• a crystalline substance that includes water molecules as part of its structure

• the product of reacting a molecular compound with water

• a compound with the empirical formula CH₂O

• a substance that releases heat when it reacts with water

What term refers to Avogadro’s number of anything?

• formula weight

• formula unit

• mole

• stoicheion

What determines the amount of product that can be formed in a chemical reaction?

• limiting reactant

• molar mass

• percent composition

• coefficient

Which of the following compounds will be produced by a single-displacement reaction between zinc and copper(II) sulfate? How do you know?

• ZnSO₄; zinc replaces copper(II).

• Cu₂Zn; zinc replaces sulfate.

• Cu₂(SO4)₃; zinc changes copper(II) into copper(III).

• CuZn(SO₄)₂; the reactants combine.