C2.4 Rates of reaction Flashcards Preview

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Flashcards in C2.4 Rates of reaction Deck (16)
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1
Q

How can the rate of a chemical reaction be found?

A

Amount of reactant used or Amount of product formed
___________________ ____________________
Time Time

2
Q

When can chemical reactions occur?

A

When reacting particles collide with each other and with sufficient energy

3
Q

What is the activation energy?

A

The minimum amount of energy particles must have to react

4
Q

Increasing the pressure of reacting gases…

A

Increases the frequency of collisions as the particles are more squashed together

5
Q

Increasing the temperature increases the…

A

Speed of the reacting particles so that they collide more frequently and energetically

6
Q

What increases the rate of reaction?

A

More frequent and harder collisions of the reacting particles

7
Q

Increasing the concentration of reactants in solutions…

A

Increases the frequency of collisions as there are more particles of reactant hitting the water molecules which makes collisions more likely

8
Q

Increasing the surface area of solid reactants…

A

Increases the frequency of collisions as the particles will have more area to collide against

9
Q

What do catalysts do?

A

Change the rate of chemical reactions

10
Q

Catalysts are not…

A

Used up during the reaction

11
Q

Different reactions need…

A

Different catalysts

12
Q

Why are catalysts important in industrial processes?

A

They increase the rates of chemical reactions and therefore reduce the amount of energy needed which reduces the costs

13
Q

What does the reaction between hydrochloric acid and marble chips show?

A

Using ground marble chips and powdered chalk is more effective than using big pieces of marbles there is more surface area, increasing the collisions and therefore increasing the rate of reaction

14
Q

What does the reaction between magnesium metal and dilute hydrochloric acid show?

A

An increased concentration of hydrochloric acid reacts much quicker with the magnesium than a lower concentration

15
Q

What does the reaction between sodium thiosulfate and hydrochloric acid show?

A

When the two react a cloud precipitate is formed, by watching how quickly the precipitate is formed you can see the rate of reaction. With higher temperature the cloudy precipitate forms quicker, showing that and increase in temperature increases the rate of reaction

16
Q

What does the decomposition of hydrogen peroxide show us?

A

The effect of different catalysts, it shows which catalysts increase the rate of reaction the most. It can also be used to test the effects of temperature and concentration