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Flashcards in C2 Rates of reaction Deck (22)
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1

What is rate of reaction?

Speed of chemical reaction – how fast is a chemical reaction

2

When are reactants used up fastest in a reaction?

At the start of  the reaction

3

Give 4 factors that affect rate of reaction.

Temperature

Concentration

Surface area

Catalyst

4

What 2 things need to occur for a reaction to take place?

Collide

With enough energy

5

What is activation energy?

Energy needed to start reaction to break the bonds

6

Give 3 reasons why increasing temperature increases the rate of reaction.

Increase energy

Move faster

More likely to collide

7

Why does increasing concentration of a solution increase the rate of reaction?

More particles

More chance of colliding

8

Why does increasing pressure of a gas increase the rate of reaction?

More chance of colliding

9

How do you increase the surface area of a marble chip?

Grind it into smaller pieces

10

What effect does increasing the surface area have on the rate of reaction?

Increase surface area increases rate of reaction

11

What is a catalyst?

Speeds up a chemical reaction

Without being used up

12

Why are catalysts important in industry?

Reactions quicker

At lower temperature

So cheaper to make product

13

Can you use the same catalyst for any reaction?

No – specific

14

Sketch a higher temperature.

15

Sketch a lower temperature.

16

Describe how the volume of gas changes

Volume of gas increases quickly in first 3 to 4 minutes

Then slows down

At 8 minutes no more gas made

17

If magnesium reacts with hydrochloric acid which of the following will speed up the reaction:

a. Lower temperature

b. Bigger pieces of magnesium

c. More concentrated acid

d. More dilute acid

e. Magnesium powder

f. Increasing the temperature

a.  slower

b. slower

c. faster

d. slower

e faster

f  faster

18

What is a catalyst?

Speeds up a chemical reaction without being used up

19

Is a line of best fit always a straight line?

no

20

What is an anomalous result?

Does not fit on best line of fit

Higher or lower than expected

21

How can an anomalous result be caused in a rates of reaction experiment?

Mistake in measuring amount of product or amount of reactant

22