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questions 6.2
"BC Science 10" Factors affecting rate of Chemical Reactions
17
Chemistry
10th Grade
04/26/2013

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Cards

Term
Name the four factors which affect the rate of a reaction
Definition

temperature

surface area

concentration

presence of a catalyst

Term
Examples of temperature
Definition

1. cooking with heat speeds up breaking down of food

2. freezing food stops decomposition

3. refrigerating food slows down decomposition

4. prehistoric animals found preserved in the ice

5. increasing temperature when graphite turns to diamonds shortens the time 

Term
Examples of concentration
Definition

1. more dish soap in water

2. diluting a solution, more water when mixing frozen orange juice

3. blowing on a fire and flames shoot up

4. in a crowded hallway, more chance of bumping into someone

Term
examples of surface area
Definition

1. chopping vegetables for soup

2. crushing garlic to release fragrence

3. breaking a reactant into smaller pieces

4. sugar grains vs sugar cubes

5. twigs vs logs of wood

6. whole grains and solid coal burn slowly while grain and coal dust explode 

Term
examples of catalysts
Definition

1. catalytic convverter in exhaust system of vehicles

2. digestive enzymes in your stomach

Term
How does increasing temperature affect the rate of a reaction?
Definition
The reactant particles move more quickly, they collide more frequently with more energy, the higher the rate of reaction.
Term
How does decreasing temperature affect the rate of a reaction?
Definition
The reactant particles move more slowly, they collide less frequently with less energy, the lower the rate of reaction.
Term
How does increasing concentration affect the rate of a reaction?
Definition
There is a greater chance that collisions will occur, a higher reaction rate.
Term
How does decreasing concentration affect the rate of a reaction?
Definition
There is less chance that collisions will occur, a lower reaction rate.
Term
How does increasing surface area affect the rate of a reaction?
Definition
It increases the surface contact between reactants, increasing the rate of reaction.
Term
How does decreasing surface area affect the rate of a reaction?
Definition
It decreases the surface contact between reactants, decreasing the rate of reaction.
Term
How does adding a catalyst affect the rate of a reaction?
Definition
Less energy is needed to break and form bonds during a reaction. It speeds up the rate of reaction.
Term
How does removing a catalyst affect the rate of a reaction?
Definition
More energy is needed to break and form bonds during a reaction. It slows down the rate of the reaction.
Term
When is surface area not a factor during a reaction?
Definition
If both reactants are gases or liquids that mix together.
Term
How do you increase surface area?
Definition
Cut the reactants into smaller pieces.
Term
How do you increase concentration?
Definition
Add more solute, or less solvent to a solution.
Term
How do you decrease concentration?
Definition
Add less solute, or more solvent to a solution.
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