Topic 6 Rates Of Reaction Flashcards Preview

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Flashcards in Topic 6 Rates Of Reaction Deck (15)
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1
Q

What is the rate of reaction

A

Is how fast the reactants are changed into products

2
Q

2 examples of slow reactions have

A
  • rustling of iron

- chemical weathering- acid rain damage to limestone buildings

3
Q

An example of a moderate speed reaction

A

Metal magnesium reacting with an acid to produce a gentle stream of bubbles

4
Q

What type of reaction is burning

A

A fast reaction but explosions are even faster and release lots of gas

5
Q

How can you find the speed pf a reaction

A

By recording the same amount of product formed, or the amount of reactant used up over time

6
Q

What a steeper line represent

A

The faster the rate of reaction

7
Q

what is Le Chatelier’s principle

A

the idea that if you change the the conditions of a reversible reaction at equilibrium, the system will try to counteract the change

8
Q

what happens to the equilibrium if you decrease the temperature? what does this mean for products?

A

it will move in the exothermic direction to produce more heat

you will get more products for the exothermic reaction and fewer products for the endothermic reaction

9
Q

what happens to the equilibrium if you raise the temp?

what does this mean for products?

A

the equilibrium will move in the endothermic reaction to try and decrease the temp.

you will get more products for the endothermic reaction and fewer products for the exothermic reaction

10
Q

what does changing the pressure only affect an equilibrium involving …

A

gases

11
Q

what happens if you increase the pressure, what will the equilibrium do, what direction will it move to

A

it tries to reduce the pressure- it moves in the direction where there are fewer molecules of gas

12
Q

what happens if you decrease the pressure

A

the equilibrium tries to increase it- it moves in the direction where there are more molecules of gas

13
Q

what happens if you change the concentration of the products or the reactants

A

the system will no longer be at equilibrium

14
Q

what does the system do if you increase the concentration of the REACTANTS

A

it tries to decrease it by making more products

15
Q

what does the system do if you decrease the concentration of the products

A

the system tries to increase it again by reducing the amount of reactants