Reaction Rate and Equilibrium

In an exothermic reaction, heat is ...

• taken in
• given out

In an endothermic reaction, heat is 

• taken in
• given out

Increase in temperature of the reactants can do one of the following

• Slow collision frequency
• Allow less effective collision between the particles
• Cause particles to lose speed
• Increase collision between the particles thus increasing the rate.

The amount of a substance in a given volume.

• concentration
• temperature
• surface area
• catalyst

Grinding a seltzer tablet into powder increases the rate of reaction due to increased

• concentration
• surface area
• temperature
• reactants

Which of the following slows down the rate of a chemical reaction?

• Place the reactants in hot water
• Place the products in ice bath
• Place the reactants in a ice bath
• Keep stirring the reactants with a stirring rod

If more reactants are used in a chemical reaction, more products will be produced. This is because

• More reactants cause the reaction to heat up
• More reactants take up the same volume
• More reactants have more atoms to react to form more products
• Too many products can slow down the reaction

One clue of a chemical change is the formation of a precipitate. A precipitate is formed when

• Two liquids react and a gas is produced
• A solid dissolves in a liquid
• One liquid dissolves in another
• Two liquids react and a solid is formed

In a chemical reaction, if the reactants are heated, the reaction usually happens

• Faster
• Slower
• At the same rate
• In a smaller volume

What makes an effective collision?

• When molecules collide.
• When molecules collide with the proper orientation.
• When molecules collide with proper orientation and enough kinetic energy.
• High Temperature.