# Chemistry C5

• Created by: Amy_5639
• Created on: 10-04-18 18:59
1.What is the 'rate' of reaction?
How quickly a reaction happens. Rate of reaction= amount of reactant used or amount of product formed (divided by) time
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2.Explain how you could follow the rate of reaction where two colourless solutions react to form a precipitate.
Mix the two reactant solutions and put the flask on paper that has marks on. Observe the mark through the mixture and measure how long it takes for the mark to be obscured. The faster it disappears, the faster the reaction
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3.Describe how you would set up an experiment to follow the rate of a reaction by measuring the volume of gas that it produced.
Measure the volume of gas produced using a gas syringe. The more gas given off during a set time interval, the faster the reaction
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4.Describe how you would find the rate of respiration from a straight line graph.
Find two points on the line. Draw a straight line down from the higher point and straight across from the lower one to make a triangle.Then work out the gradient using the formula: change in y (divided by) change in x
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5.Imagine you have drawn a results graph for a rate of reaction experiment. The graph is a curve. Describe how you could find the rate of reaction at a certain time point using the graph.
To find a gradient at a certain point, draw a tangent at that point. Then find out the gradient of the tangent
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6.State how the frequency of a successful collisions affects the rate of reaction.
The more successful the collisions there are, the faster the reaction is
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7.What effect will raising the temperature have on the rate of reaction?
The particles move faster so they're going to have more collisions, increases the energy of collisions since the particle are moving faster, there will be more successful collisions
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8.How does increasing the pressure of a reaction involving gases affect the rate of reaction?
Increasing the pressure means the particles are crowded so the frequency of collisions between particles will increase- so the rate of reaction will also increase
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9.What effect does a catalyst have on the activation energy needed for a reaction to take place?
Catalysts work by decreasing the activation energy needed for a reaction to occur. They do this by providing an alternative pathway that has a lower activation energy
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10.Sketch a reaction profile showing an uncatalysed reaction and the same reaction with a catalyst added
.
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11.What is an enzyme?
Biological catalyst
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12.Draw the symbol which shows that a reaction is reversible.
.
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13.What is a closed system?
Where none of the reactants or products can escape
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14.If the position of equilibrium for a reversible reaction lies to the right, what does that tell you about the relative amounts of reactants and products present?
this tells you there will be lots of products and not much of the reactants
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15.State Le Chatelier's principle.
Le Chatelier's principle states that if there's a change in concentration, pressure or temperature in a reversible reaction, the equilibrium position will move to help counteract that change.
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16.Describe what would happen to the equilibrium position of a reversible reaction if you increased the concentration of reactants.
The equilibrium will move to the right to use up the reactants (making more products)
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## Other cards in this set

### Card 2

#### Front

2.Explain how you could follow the rate of reaction where two colourless solutions react to form a precipitate.

#### Back

Mix the two reactant solutions and put the flask on paper that has marks on. Observe the mark through the mixture and measure how long it takes for the mark to be obscured. The faster it disappears, the faster the reaction

### Card 3

#### Front

3.Describe how you would set up an experiment to follow the rate of a reaction by measuring the volume of gas that it produced.

### Card 4

#### Front

4.Describe how you would find the rate of respiration from a straight line graph.

### Card 5

#### Front

5.Imagine you have drawn a results graph for a rate of reaction experiment. The graph is a curve. Describe how you could find the rate of reaction at a certain time point using the graph.