Topic 7 - Rates of Reaction and Energy Changes

Question 1

What is the rate of reaction?

Answer 1

how quickly a reaction happens

Question 2

What is the equation for rate of reaction?

Answer 2

Amount of reactants used or amount of products used / time

Question 3

What are the 3 examples rate of reaction can be mesured?

Answer 3

Precipitation
Change in mass ( Usually gas given off)
Volume of gas given off

Question 4

Precipitation

Rate of reaction

Answer 4

• works when mixing two clear solutions, that precipitate once reacted
• Mix the two and place the flask on a surface with a mark
• Observe how long it takes for the mark to be obscured through the precipitate

This result if subjective

Question 5

Change in mass ( usually given off)
Experemnt of rate of reaction

Answer 5

Rate of reaction that produces gas using a balance
The quicker the mass/ gas is lost, the quicker the reaction.
The reaction has finished once the mass stops changing
You can plot the results of mass aganst time

If the gas is harmfull, use a gas cupboard

Question 6

The volume of gas given off ( rate of reaction experement )

Answer 6

Involves the use of gas syringe to mesure gas given off
The more gas given off during a time set interval, the faster the reaction. the reaction is finished when no more gas is produced
Graph of gas volume/ time elapsed

Use the rightsize of syringe, if too much gas can blow the plunger off