Rates Of Reaction And Temperature

Question 1

What are the main factors that affect reaction rate?

Answer 1

Concentration, pressure, temperature and surface area

Question 2

What is concentration?

Answer 2

Measure of amount of particles in a given area. You can get higher concentration by increasing the amount of particles or decreasing the volume.

Question 3

What is pressure?

Answer 3

When you compress gas particles closer together.

Question 4

What do gas particles have to do to react and what is it called when this happens?

Answer 4

They have to collide with each other at a sufficient speed (fruitful collision).

Question 5

How can RoR be measured with gasses?

Answer 5

RoR = number of fruitful collisions/second

Question 6

When ___ is ___ the ___ will ___

Answer 6

When PRESSURE is INCREASED the VOLUME will DECREASE

Question 7

How does a higher temperature increase RoR?

Answer 7

The higher the temperature, the more kinetic energy the particles will have. This means that they will vibrate more and move quicker.

Question 8

How does surface area increase RoR?

Answer 8

If particles are reacting with one object, there is not much surface area and less particles will be able to react with the surface at a given point. When this object is divided into two, there is more surface area and more particles can react with the surace at a given point.

Question 9

If two molecules, A2 and B2, react with eachother to get another molecule, write an equation to present this.

Answer 9

A2+B2 –> 2AB

Question 10

What is an endothermic reaction?

Answer 10

A reaction where more energy is taken in to break bonds than to make new ones

Question 11

What is an endothermic reaction?

Answer 11

A reaction where less energy is taken in to break bonds than to make new ones.

Question 12

Explain in terms of particles why a larger surface area increases the rate of a reaction

Answer 12

The larger the surface area means the more particles that will be able to react with the surface at a given time.

Question 13

Explain in terms of particles why a catalyst increases rate of reaction

Answer 13

A catalyst reduces the activation energy and because of this there are more fruitful collisions between particles.

Question 14

When a catalyst is used in an experiment it is not ___

Answer 14

Used up

Question 15

Different substances may need ____

Answer 15

Different catalysts to speed up the rate of reaction

Question 16

Explain in terms of particles why concentration speeds up rate of reaction.

Answer 16

The higher concentration means the closer particles are together. Because of this, there is less space for particles to move around meaning more frequent collisions.

Question 17

A student investigated the RoR of magnesium and hydrochloric acid.
He put magnesium into several different test tubes with different concentrations.
Give two variables he should control

Answer 17

Mass and surface area of magnesium

Question 18

The RoR can be calculated with the change in _ over change in _

Answer 18

y, x