Rate of reaction 6 mark question - Phoenix Hoyle | Library

8

Explain how and why the rate of reaction changes between points A, B and C, using ideas about the collisions between particles
Graph interpretation
reaction is fastest at the start ______as the gradient is _____________  then the reaction slows down ______ as the gradient is ______________     then has stopped by  ______  as the line is _______________ an no more _____________gas is being produced so the _________  does not change.

Other Answer Choices:

A

mass

horizontal

B

C

shallower

steepest

hydrogen

6

Collision theory 
More concentrated acid contains more particles per unit ___________ 
More zinc means greater _________________ 
particles must ____________to react   
more _____________  collisions gives more _______________ which causes a faster reaction  
When collisions stop reaction __________.  

Other Answer Choices:

frequent

collide

stops

volume

successful

surface area

6

As the concentration of acid decreases the number of acid particles per unit ___________ decreases so there are less _____________ collisions and the rate of reaction decreases. 
As the _________________  of zinc decreases as zinc is used the ______________of the collisions decreases and this leads to lower rate of reaction.
When the __________________  of the acid or the surface area of the zinc reaches zero the reaction __________ 

Other Answer Choices:

frequency

surface area

frequent

concentration

stops

volume

10

Liz reads an article on the internet which says that copper acts as a catalyst for this reaction.
She does an investigation to find out if this is true.
How should she do the investigation, and what results should she expect?
She should repeat the experiment using a copper _____________ keeping the mass and size of the _________  pieces the same and the , __________________  volume and type of acid the same. She should also make sure the reaction takes place at the same ________________ 
Liz should find:
The line of best fit graph would be ____________ at the start.
The time taken for the line to become flat would _____________.
The final loss in mass would be ______________  
Indicating that the copper catalyst had ______________  the rate of reaction.
By providing an alternate reaction ____________  of lower _______________  energy.

Other Answer Choices:

steeper

temperature

zinc

catalyst

decrease

concentration

pathway

activation

increased

unchanged