Reaction Rates

Question 1

What reaction rate is rusting?

Answer 1

Slow

Question 2

Fast reaction rate = ?

Answer 2

= short time.

Question 3

Slow reaction rate = ?

Answer 3

= long time.

Question 4

State the Collision Theory

Answer 4

For a chemical reaction to occur, molecules must collide with a suitable orientation sufficient energy.

Question 5

List the six ways of increasing reaction rates.

Answer 5

1. shrink container or increase concentration
2. increase number of particles
3. speed up particles but adding heat– Increased temperature
4. break up clumps into individual particles
5. use a catalyst
6. increase pressure

Question 6

What is the rate of reaction?

Answer 6

The speed of a chemical reaction

Question 7

What does exothermic mean?

Answer 7

A chemical reaction that releases heat or energy. e.g. respiration or combustion.

Question 8

What does endothermic mean

Answer 8

A chemical reaction that absorbs all takes in heat or energy. E.g. photosynthesis.

Question 9

What is an example of an endothermic reaction

Answer 9

Photosynthesis or chemical cold pack

Question 10

What is the name of a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.

Answer 10

A catalyst.

Question 11

What is an Enzyme?

Answer 11

A biological catalyst (protein).

Question 12

What is an electrode?

Answer 12

A conductor that emits or collects electrons in a cell.

Question 13

What is the name of a liquid that conducts electricity as a result of the presence of ions?

Answer 13

An electrolyte.

Question 14

Anodes and Cathodes are______.

Answer 14

Anodes and Cathodes are electrodes.

Question 15

What is an anode?

Answer 15

A POSITIVE electrode in electrolysis, and a NEGATIVE electrode in a Galvanic Cell.

Question 16

What is a cathode?

Answer 16

A NEGATIVE electrode in electrolysis, and a positive electrode in a Galvanic Cell

Question 17

What are cations and anions?

Answer 17

Charged ions.

Question 18

What charge does a cation have?

Answer 18

Positive.

Question 19

What charge does an anion have?

Answer 19

Negative.

Question 20

What is a Voltaic Cell?

Answer 20

A device that produces and electromotive force (potential difference - voltage) as result of chemical reactions that take place within it. A Battery.

Question 21

Define Electrolysis.

Answer 21

The production of a chemical reaction by passing an electric current through an electrolyte.

Question 22

What is corrosion?

Answer 22

A chemical or electrochemical attack on the surface of a metal.

Question 23

Give an example of corrosion.

Answer 23

Corrosion of iron to form a hydrated iron (III) oxide.

Question 24

What is the name of the list of metals arranged from the most reactive to the least reactive.

Answer 24

The Reactivity Series.

Question 25

How does a catalyst speed up a reaction?

Answer 25

A catalyst speeds up a reaction by lowering the activation energy. A catalyst is NOT consumed in the reaction.

Question 26

What is an inhibitor?

Answer 26

An inhibitor is a substance that slows down reactions. Opposite of catalyst.

Question 27

TRUE or FALSE

a) Enzymes are specific to a reaction or group of similar reactions.
b) The activity of an enzyme is not affected by substrate (substance on which it reacts), concentration, temperature or Ph.
c) An enzyme is a protein that ACTS as a catalyst.

Answer 27

a) TRUE
b) FALSE, enzymes are affected by all of these variables.
c) TRUE

Question 28

What is the reaction rate of an explosion?

Answer 28

Fast