What does the catalyst do?

provides pathway with lower activation energy

ALL the reactants have been used up, the reaction has stopped

To react, reactant particles must collide with

enough energy and correct orientation

In a reaction between Mg and excess hydrochloric acid, HCl

Reaction C had the smallest mass of Mg metal

In this reaction what could you measure / record to get some data?

time for X to be hidden by products

Increasing temperature means particles have more EK - so more collisions will have energies

equal or above the activation energy

Which of these would increase the number of collisions per time?

increased number of particles / mL (increased concentration)

In a graph of amount of product produced vs time, in a reaction

the gradient of the line decreases as the reaction proceeds

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NCEA Level 2 Rates of Reaction

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Level 2 NCEA Rates of reaction

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Questions 15

Answers

1
The reaction shown here is
exothermic
endothermic
very fast
very slow
2
What does the catalyst do?
change the energy of the products
provides pathway with lower activation energy
give the reactants more energy
increase the activation energy
3
What effect does using a catalyst have on the energy change, ΔH, for the reaction?
no change at all
it provides an alternative reaction pathway
it increases it
it lowers it
4
At point 3
the reaction is slowing down
The reaction is going at a steady rate
ALL the reactants have been used up
the reaction has stopped
5
The reaction shown here is
it is impossible to tell
exothermic
endothermic
6
The minimum amount of energy required for a chemical reaction to occur is called
collision energy
activity energy
particle theory
activation energy
7
To react, reactant particles must collide with
enough activation energy
enough energy and correct orientation
enough force
eachother
8
Increasing the concentration of reactants makes for
more collisions
more collisions / time
more energetic collisions
more effective collisions
9
In a reaction between Mg and excess hydrochloric acid, HCl
Reaction C had the smallest mass of Mg metal
reaction C has the largest SA of Mg metal
Reaction B had more concentrated acid than A
reaction B was the fastest rate
10
In this reaction what could you measure / record to get some data?
time for X to all react
time for X to disappear
all of these
time for X to be hidden by products
11
Increasing temperature means particles have more E_K - so more collisions will have energies
equal or above the activation energy
less than the activation energy
that are successful energies
exactly equal to the activation energy
12
The rate of reaction is greatest at point
1
2
3
13
Which of these would increase the number of collisions per time?
increasing the size of solid particles
decreasing the speed of particles by cooling the particles
increased number of particles / mL (increased concentration)
decreasing the number of particles / mL
14
In a graph of amount of product produced vs time, in a reaction
the gradient of the line increases as the reaction proceeds
the gradient of the line decreases as the reaction proceeds
the line gets steeper as time passes
the line is straight
15
The reaction taking place at the highest temperature is
B
A
They are all at the same temperature
C

NCEA Level 2 Rates of Reaction Flashcards | StudBud