Chemical Reactions and Equations

Front

Consider the reaction that transforms one hydrogen molecule to two hydrogen atoms: H₂ ⟶ H + H

How you would describe this energy change?

Back

Bonds must be broken in this process.

Therefore, energy will be absorbed in this reaction.

When energy is absorbed (used) the change in energy is represented by a positive number.

This is an endothermic process.

Front

Consider the reaction that creates one hydrogen molecule from two hydrogen atoms: H + H ⟶ H₂

How you would describe this energy change?

Back

Bonds form in this process.

Therefore, energy will be released in this reaction.

When energy is released the change in energy is represented by a negative number.

This is an exothermic process.

Front

How would you refer to the molecules on the left and right hand side of the arrow in the reaction represented: H₂ + O₂ ⟶ H₂O

Back

Reactants participate in a chemical reaction represented on the left side of an equation and produce products represented on the right side.

Front

True or False.

This is the correct, balanced equation that best represents the reaction of nitrogen with hydrogen to yield ammonia (NH₃).

N₂ + 3 H₂ --> 2 NH₃

Back

True.

This equation shows the same number of atoms on each side ( 2 x N and 6 x H)

Front

True or False.

This is the correct, balanced equation that best represents the reaction of nitrogen with hydrogen to yield ammonia (NH₃).

N₂ + H₂ --> NH₃

Back

False.

This equation does NOT show the same number of atoms on each side

Reactants: 2 x N and 2 x H

Products: 1 x N and 3 x H

Front

What type of reaction is this?

Mg + CuSO₄ --> MgSO₄ + Cu

Back

single replacement reaction

Mg replaces Cu in the compound.

Front

What type of reaction is this?

CaCO₃ --> CaO + CO₂

Back

Decomposition

One reactant becomes two or more products.

Front

What type of reaction is this?

2 H₂ + O₂ --> 2 H₂O

Back

Combination

Two or more reactants combine to make one product.

Front

What type of reaction is this?

Pb(NO₃)₂ + 2 KF --> PbF₂ + 2 KNO₃

Back

Double Replacement

ions in each compound switch places.

Front

What type of reaction is this?

CH₄ + 2 O₂ --> CO₂ + 2 H₂O

Back

Combustion

a hydrocarbon reacts with oxygen to produce carbon dioxide and water