C2 Rates of reaction Flashcards

1
Q

What is rate of reaction?

A

Speed of chemical reaction – how fast is a chemical reaction

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2
Q

When are reactants used up fastest in a reaction?

A

At the start of the reaction

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3
Q

Give 4 factors that affect rate of reaction.

A

Temperature

Concentration

Surface area

Catalyst

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4
Q

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

A

Collide

With enough energy

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5
Q

What is activation energy?

A

Energy needed to start reaction to break the bonds

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6
Q

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

A

Increase energy

Move faster

More likely to collide

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7
Q

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

A

More particles

More chance of colliding

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8
Q

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

A

More chance of colliding

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9
Q

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

A

Grind it into smaller pieces

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10
Q

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

A

Increase surface area increases rate of reaction

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11
Q

What is a catalyst?

A

Speeds up a chemical reaction

Without being used up

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12
Q

Why are catalysts important in industry?

A

Reactions quicker

At lower temperature

So cheaper to make product

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13
Q

Can you use the same catalyst for any reaction?

A

No – specific

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14
Q

Sketch a higher temperature.

A
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15
Q

Sketch a lower temperature.

A
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16
Q

Describe how the volume of gas changes

A

Volume of gas increases quickly in first 3 to 4 minutes

Then slows down

At 8 minutes no more gas made

17
Q

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

a. slower
b. slower
c. faster
d. slower

e faster

f faster

18
Q

What is a catalyst?

A

Speeds up a chemical reaction without being used up

19
Q

Is a line of best fit always a straight line?

A

no

20
Q

What is an anomalous result?

A

Does not fit on best line of fit

Higher or lower than expected

21
Q

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

A

Mistake in measuring amount of product or amount of reactant

22
Q
A