Rate of Reaction

What do all chemical reactions involve?

• The disappearance of substances

• The formation of one or more new substances

• The destruction of matter

• The creation of energy

Which of the following is a sign of a chemical reaction?

• A change in weight

• A change in size

• A change in shape

• A change in appearance

What is the identification test for carbon dioxide?

• Turns blue litmus paper red

• Burns with a 'pop'

• Relights a glowing splint

• Turns lime water milky

What type of reaction absorbs heat and causes the temperature of the surroundings to decrease?

• Endothermic

• Exothermic

• Combustion

• Neutralization

Which of the following is an example of a chemical reaction in everyday life?

• Fruit ripening

• Ice melting

• Salt dissolving

• Water boiling

What must happen for a chemical reaction to take place between two substances?

• They must collide

• They must be heated

• They must be mixed with water

• They must be cooled

How does decreasing particle size affect the rate of a reaction?

• Decreases the rate

• Increases the rate

• Stops the reaction

• Has no effect

What is the effect of increasing the concentration of reactants on the rate of reaction?

• Stops the reaction

• Has no effect

• Decreases the rate

• Increases the rate

What is the effect of increasing temperature on the rate of reaction?

• Increases the rate

• Decreases the rate

• Has no effect

• Stops the reaction

What is a catalyst?

• A substance that stops a reaction

• A substance that speeds up a reaction without being used up

• A substance that changes the color of reactants

• A substance that slows down a reaction