Rates Of Reaction

Question 0

High concentration

Answer 0

More collisions

Question 1

Low concentration

Answer 1

Few collisions

Question 2

Change in temperature

Answer 2

If temp is increased, reactant particles move more quickly, more particles have activation energy, particles collide more often-collisions result in reaction - RATE OF REACTION IS INCREASED

Question 3

Exothermic reactions

Answer 3

Increase in temperature
TriangleH = -
Burning reactions include combustion of fuels
Bond forming

Question 4

Endothermic reactions

Answer 4

Decrease in temp
Ice melting, kettle boiling,
Reactants gain energy
Less common than Exothermic 
TriangleH= +

Question 5

Activation energy

Answer 5

Energy needed to begin a reaction and break chemical bonds in the reaction

Question 6

Catalysts

Answer 6

Not changed by the reaction
The same amount at the start and the end of a reaction
Help bonds break easily, less energy to react making reaction rate faster

Question 7

React with water

Answer 7

Potassium
Sodium
Lithium
Calcium

Question 8

React with acids

Answer 8

Potassium 
Sodium
Lithium
Calcium 
Magnesium
Aluminum 
Zinc
Iron
Tin
Lead

Question 9

React with oxygen

Answer 9

Potassium 
Sodium
Lithium
Calcium 
Magnesium
Aluminum 
Zinc
Iron
Tin
Lead

Copper
Mercury
Silver

Question 10

Displacement reactions

Answer 10

A more reactive metal will displace a less reactive metal from solutions of compounds