Unit 9 Test: Chemical Reactions

Which of the following statements is incorrect:

• A. A combustion reaction is a reaction where diatomic oxygen is a product

• B. When the combustion of a reactant that contains carbon occurs, carbon dioxide will be one of the products

• C. When the combustion of a reactant that contains nitrogen occurs, diatomic nitrogen will be one of the products

• D. A combustion reaction can easily be balanced by saving the oxygen’s for last

The symbol (aq) in a chemical equation means:

• A catalyst is needed

• Yields

• Heat is supplied to the reaction

• The substance is liquid

• The substance is dissolved in water

The symbol Δ in a chemical equation means:

• The substance is a liquid

• Yields

• A catalyst is needed

• Precipitate is formed

• Heat is supplied to the reaction

In a double replacement reaction:

• The reactants are usually an ionic and covalent compound

• The two reactants are two ionic compounds

• Energy and light is always produced

• An element and a compound react

• None of these

In order for the reaction Al + HCl → AlCl₃ + H₂ to occur, which of the following must be true:

• Al must be above Cl on the activity series

• Al must be above H on the activity series

• Heat must be supplied to the reaction

• AlCl₃ must be a precipitate

• None of these

The symbol ↔ indicates:

• That heat must be applied

• An incomplete combustion reaction

• A gas is formed by the reaction

• That the reaction is reversible

• None of these

For each of the following, convert the word equation into a formula equation, BUT do not balance! a) barium chlorate → barium chloride + oxygen

• Ba(ClO3)2 → BaCl2 + O2

• BaCl2 → Ba(ClO3)2 + O2

• Ba(ClO3)2 + O2 → BaCl2

• BaCl2 + O2 → Ba(ClO3)2

For each of the following, convert the word equation into a formula equation, BUT do not balance! b) chlorine + potassium nitride → nitrogen + potassium chloride

• Cl2 + K3N → N2 + KCl

• Cl2 + K2N → N2 + KCl2

• Cl + K3N → N2 + KCl

• Cl2 + K3N → N2 + K2Cl

For each of the following, convert the word equation into a formula equation, BUT do not balance! c) sodium nitride + aluminum bromate → aluminum nitride + sodium bromate

• Na3N + Al(BrO3)3 → AlN + Na(BrO3)

• NaN + AlBrO3 → AlN + NaBrO3

• Na2N + Al2(BrO3)3 → Al2N3 + NaBrO3

• Na3N + AlBr3 → AlN + NaBrO3

Balance each of the following equations. a) ___ CrF2 + _____ Al2(SO4)3 → ___ AlF3 + ___ Cr(SO4)

• 3 CrF2 + Al2(SO4)3 → 2 AlF3 + 3 Cr(SO4)

• 2 CrF2 + 3 Al2(SO4)3 → 4 AlF3 + 6 Cr(SO4)

• 4 CrF2 + 2 Al2(SO4)3 → 3 AlF3 + 4 Cr(SO4)

• 3 CrF2 + 2 Al2(SO4)3 → 2 AlF3 + 3 Cr(SO4)

Tags

NGSS.HS-PS1-7