3 b) Rates of Reaction Flashcards Preview

iGCSE Chemistry - Edexcel > 3 b) Rates of Reaction > Flashcards

Flashcards in 3 b) Rates of Reaction Deck (9)
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1
Q

Catalyst

A

Substance that speeds up a chemical reaction by providing an alternative pathway of lower activation energy. Catalysts are not used up and remain chemically unchanged at the end of the reaction.

2
Q

Collision theory

A

Reactant particles must collide with each other and the collision needs to have sufficient energy and the correct orientation for a reaction to occur.

3
Q

Dependent variable

A

What you measure in an experiment.

4
Q

Independent variable

A

What you vary in an experiment.

5
Q

Rate

A

The speed at which the amount of reactants decreases or the amount of products increases. It is measured as a change in the concentration (or amount) per unit time.

6
Q

Activation energy

A

Minimum amount of energy required to result in a reaction (successful collision).

7
Q

Anomalous result

A

A result that does not fit in with the pattern of the others.

8
Q

Kinetic energy

A

A form of energy a substance possesses due to motion.

9
Q

Tangent

A

A straight line that touches a curve, but does not cut across it.