Rate Of Reaction Flashcards Preview

Chemistry > Rate Of Reaction > Flashcards

Flashcards in Rate Of Reaction Deck (24):
1

The rate of reaction depends on what four things?

1) temperature

2) catalyst

3) concentration

4) surface area of solids

2

What four things can be a cause of an increased rate?

1) increase in temperature
2) increase in concentration
3) catalyst added
4) solid reactant crushed up into smaller bits

3

What are three ways used to measure the rate of a reaction?

1) precipitation
2) change in mass
3) The volume of the gas given off

4

What is the equation for the rate of reaction?

Rate of reaction=

Amount of reactant used or amount of product formed

____________________________

Time

5

What is precipitation?

This is when the product of the reaction is it precipitative which clouds the solution

6

Through using precipitation how can you measure the quickness of the reaction?

1) observer mark to the solution and measure how long it takes for it to disappear the quicker the mark disappears the quicker the reaction

7

Why doesn't precipitation work on all solutions to measure the rate of reaction?

Precipitation only works for reactions where the initial solution is rather see through

8

What is the problem with the results of precipitation?

The result is very subjective- different people might not agree over the exact point when the mark disappears

9

How can you Measure the rate of reaction using the change in mass?

Through measuring the gas given off

10

Why are measuring the speed of a reaction that produces a gas what can this be carried out on?

A mass balance

11

How does the mass balance work in measuring the speed of a reaction that produces gas?

As the gases are released the mass disappearing is easily measured on the balance. The quicker the reading on the balance drops the faster the reaction

12

I would of precipitation, change in mass and the volume of gas given off, which method is more accurate in measuring the rate of reaction?

Change in mass through using a mass balance

13

How is measuring the rate of reaction through the change in mass the most accurate method? Name a disadvantage

Because the mass balance is very accurate but he has the disadvantage of releasing the gas straight into the room

14

What is involved to measure the rate of reaction through the volume of gas given off?

This involves the use of a gas syringe to measure the volume of gas given off. The more gas given off during a given time interval the faster the reaction

15

Given advantage and disadvantage of using the volume of a gas given off as a method of measuring the rate of reaction

Advan- gas syringes usually give volumes accurate to the nearest millimetre, so they are quite accurate

Disad- if the reaction is to vigourous you can easily blow the plunger out of the end of the syringe

16

What is the big disadvantage of using the mass balance in terms of the flask?

If the flask is to hot you will lose mass by evaporation as well as in the reaction

17

What does the reaction of hydrochloric acid and marble chips demonstrate?

This experiment is is to demonstrate the effect of breaking the solid up into small bits

18

What is the reaction of magnesium metal with dilute HCI used to determine?

Used to determine the effect of concentration

19

What does the decomposition of hydrogen peroxide show?

This experiment looks and have a catalyst affects the rate of reaction

20

Give an example of a reaction that happens very slowly and one that is very fast

The corrosion of Arjen is a reaction that happens very slowly.
Explosions are very fast reactions

21

Give three ways of increasing the rate of reaction between magnesium and sulphuric acid

Increase the temperature of the acid

Use smaller pieces

Increase the acid concentration

Use a catalyst

22

Describe one way of monitoring a reaction in which gas is given off

Measure the volume of gas given off by collecting it in a gas syringe

Or monitor the mass of a reaction flask from which the gas escapes

23

How would reducing the concentration of an acid affect the time taken for a piece of zinc to react with it?

It would increase the time taken which would reduce the rate of reaction

24

Oxidation of lactose in milk makes it go sour. How could this reaction be slowed down?

By keeping the milk cool such as storing it in the fridge