Collision Theory (Pre-Test)

A chemical change that occurs when two or more substances combine to form a new substance.

• activation energy

• chemical kinetics

• chemical reaction

• product

The measure of the change in the concentration of the reactants or products.

• activation energy

• activation rate

• chemical reaction

• concentration

The substance or particles that enter into and is altered in the course of a chemical reaction.

• catalyst

• enzyme

• product

• reactant

The number of particles present in a given volume of solution.

• catalyst

• concentration

• product

• temperature

The measure of how fast or slow a reaction happens.

• activation energy

• collision theory

• particle size

• rate of reaction

Condition that needs to be met for a chemical reaction to occur.

• Substance must be homogenous.

• Temperature should be kept constant.

• Particles should maintain a certain distance to each other.

• Particles in the substance must collide and have enough energy.

The factor that would NOT affect the rate of chemical reaction.

• concentration

• humidity

• particle size

• temperature

The factor that will slow down the rate of chemical reaction.

• Manual stirring of the substance.

• Placing substance in a hot water.

• Placing products in iced water.

• Placing reactants in ice bath.

The factor that does NOT show evidence of chemical reaction.

• Absorption of heat 

• Change of color

• Change of size

• Liberation of heat

The measure of the hotness and coldness of a substance.

• energy

• humidity

• temperature

• thermometer