U1LC2 Practice

What coefficient will balance this equation?

Si + __Cl₂ → SiCl₄

• 1

• 2

• 3

• 4

Answer explanation

Si = 1 x 1 = 1 Si = 1 x 1 = 1

Cl = 2 x 2 = 4 Cl = 1 x 4 = 4

What type of reaction is this?

Si + Cl₂ → SiCl₄

• synthesis

• decomposition

• combustion

Answer explanation

Synthesis

Format: A + B --> AB

2 or more reactants

only 1 product

No "+" on the product side

What type of reaction is this?

• synthesis

• decomposition

• combustion

Answer explanation

Synthesis

Format: A + B --> AB

2 or more reactants

only 1 product

No "+" on the product side

What type of reaction is this?

• synthesis

• decomposition

• combustion

Answer explanation

Synthesis

Format: A + B --> AB

2 or more reactants

only 1 product

No "+" on the product side

What type of reaction is this?

• synthesis

• decomposition

• combustion

Answer explanation

Decomposition Reactions

Format: AB --> A + B ...

2 or more products

only 1 reactant

No "+" on the reactant side

Usually Endothermic

What type of reaction is this?

• synthesis

• decomposition

• combustion

Answer explanation

Combustion Reactions

Format: fuel + O₂ --> CO₂ + H₂O

The "fuel" is usually a hydrocarbon (C_xH_y)

They all release energy (Exothermic)

What coefficient will balance this reaction?

2 Na + Cl₂ → __ NaCl

• 1

• 2

• 3

• 4

Answer explanation

Sodium chloride (NaCl) is used in yellow fireworks

What coefficient will balance this reaction?

N₂ + __ H₂ → 2 NH₃

• 1

• 2

• 3

• 4

Answer explanation

This reaction is actually REVERSIBLE

What coefficient will balance this reaction?

__ NaHCO₃ → Na₂CO₃ + CO₂ + H₂O

• 1

• 2

• 3

• 4

Answer explanation

Sodium bicarbonate (NaHCO₃) is commonly known as baking soda

What coefficient will balance this reaction?

__CH₄ + 2 O₂ → CO₂ + 2 H₂O

• 1

• 2

• 3

• 4

Answer explanation

Whenever you light the Bunsen burner in lab, you are performing this reaction.