Unit 3 Final Review

• sodium

• sodium chloride

• chlorine

• 3
• 4
• 2
• 1

To balance a chemical reaction, you can change the:

• subscripts
• reactants
• products
• coefficients

This is an example of a balanced chemical equation

• H_{2 +} O₂ → H₂O₂

• 2 Al + 8 O₂ → 4 Al₃O₂

• 4 Al + 3 O₂ → 2 Al₃O₂

• 3 H_{2 +} O₂ → 2 H₂O₂

What is the molar mass of Li₂S?

• 45.94 g/mol
• 24.31 g/mol
• 32.07 g/mol
• 58.69 g/mol

How many moles of NO₂ are present in 114.95 g?

• 2.5 moles
• 1.5 moles
• 5 moles
• 0.5 moles

What kind of reaction do two elements combine to form one new compound?

• Double Replacement

• Single Replacement

• Decomposition

• Synthesis

Mg(s) + 2 HCl(aq) → MgCl₂ (aq) + H₂ (g)

What state of matter is Mg?

• Solid
• Gas
• Aqueous Solution

• Liquid

Identify the type of reaction:

2 AgBr → 2 Ag + Br₂

• Decomposition reaction
• Single displacement reaction
• Combustion reaction
• Synthesis reaction

Identify the type of reaction:

AgNO₃ + NaCl → AgCl + NaNO₃

• Single displacement reaction
• Double displacement reaction
• Decomposition reaction
• Combustion reaction