Unit 6 Chemical Reactions Review

In the chemical equation, H₂O₂ (l) --> H₂O (l) + O₂ (g), the H₂O₂ is a _____.

• Product

• Reactant

• Catalyst

• Solid

A catalyst is _______ .

• The product of a reaction

• A solid product

• A chemical that speeds up the reaction

• A reactant

When the following equation is balanced, KClO₃ (s) --> KCl (s) + O₂( g), the coefficient of KClO₃ is _____.

• 1

• 2

• 3

• 4

Which of the following is the correct skeleton equation for the reaction that takes place when solid phosphorus combines with oxygen gas to form gaseous diphosphorus pentoxide?

• P (s) + O₂ (g) --> PO₂ (g)

• P (s) + O (g) --> P₂O₅ (g)

• P₂O₅ (g) --> P₂ (s) + O₂ (g)

• P (s) + O₂ (g) --> P₂O₅ (g)

In every balanced chemical equation, each side of the equation has the same number of _____.

• Atoms

• Molecules

• Coefficients

• Subscripts

If a synthesis reaction takes place between potassium and chlorine, what is the product?

• KCl

• KCl₂

• PCl

• PCl₂

The equation H₃PO₄+ 3KOH --> K₃PO₄+ 3H₂O is an example of which type of reaction?

• Synthesis

• Decomposition

• Single Replacement

• Double Replacement

• Combustion

The balanced net ionic equation for solid CaCO₃ when aqueous solutions of Na₂CO₃ and and CaCl₂ are mixed is __________.

• Ca⁺² (aq) + CO₃^-2 (aq) --> CaCO₃ (s)

• Na⁺¹ (aq) + Cl^-1 (aq) --> NaCl (aq)

• 2 Na⁺¹ (aq) + CO₃^-2 (aq) --> Na₂CO₃ (s)

• 2 Na⁺¹ (aq) + 2 Cl^-1 (aq) --> 2 NaCl (s)

In a combustion reaction, one of the reactants is...

• Nitrogen

• Oxygen

• Hydrogen

• A metal

The complete combustion of which of the following substances produces carbon dioxide and water?

• K₂CO₃

• NO

• H₂S

• C₈H₁₈