Chemistry

Question 1

What is Rate of Reaction?

Answer 1

The speed at which a reaction takes place

Question 2

To measure the Rate of Reaction, you:
(2 answers)

Answer 2

• measure how quickly the reactants are used up
• measure how quickly the products are formed

Question 3

What are the Three main methods to measure the Rate of Reaction?

Answer 3

1. Change in Mass
2. Volume of Gas formed
3. Fomation of a precipitate (decrease in light intensity over time)

Question 4

What is collision theory?

Answer 4

When two particles successfully collide into each other with sufficient energy (Activation energy), which causes a reaction as the bonds are broken.

Question 5

How does Temperature affect the Rate of Reaction?

Answer 5

At higher temperatures, the particles have higher kinetic energy,and move faster. This increase in energy makes it more likely for successful collisions, so a faster Rate of Reaction occurs.

Question 6

How does Concentration affect the Rate of Reaction?

Answer 6

Higher concentration increases the mass of reacting particles in the same space. This gives the particles a higher chance of reacting, so a faster Rate of Reaction occurs.

Question 7

How does Surface Area affect the Rate of Reaction?

Answer 7

A larger surface area (with the same mass), which can be achieved by breaking a solid into smaller pieces, provides more space for the reacting particles to collide. This increases the chance of successful collisions, so a faster rate of reaction occurs.

Question 8

What is a catalyst, and how does it affect the Rate of Reaction?

Answer 8

A substance that speeds up a reaction without being used up
By lowering the activation energy, it increases the chance of successful collisions - so a faster rate of reaction.