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AQA Chemistry Rates of Reaction
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What is the relationship between surface area to rate of reaction? Directly proportional. Inversely proportional.
Directly proportional
What is the relationship between concentration of acid to rate of reaction? Directly proportional. Inversely proportional.
Directly proportional
What is the relationship between temperature and kinetic energy of particles? Directly proportional. Inversely proportional.
Directly proportional
What is the relationship between surface area and the particle size? Directly proportional. Inversely proportional.
Inversely proportional
What is the gas produced when a magnesium is placed in a dilute acid?
Hydrogen gas
Grinding a effervescent tablet into powder increases the rate of reaction due to increased
surface area
What is the rate of reaction?
How fast a reaction is in a certain time
What is the name of the piece of equipment labelled B?
Conical flask
What is the name of the piece of equipment labelled A?
Gas syringe
When did the reaction at lower concentration stop?
40 seconds
How can we increase the surface area of a solid?
Grind it up into a powder/cut it into smaller pieces
Explain how decreasing the temperature of a reaction changes the rate of a reaction
The particles will have less energy, so there are less successful collisions and a slower rate of reaction
Explain how increasing the concentration of a reactant will change the rate of the reaction
There are more particles per unit volume, so more frequent collisions and a faster rate of reaction
Which changes decrease the rate of reaction between magnesium and air? 1 heating the magnesium to a higher temperature. 2 using a higher proportion of oxygen in the air. 3 using magnesium ribbon instead of powdered magnesium.
3 using magnesium ribbon instead of powdered magnesium
Mention 3 variables affecting  the rate of a reaction.
Concentration, temperature,  surface area
For both reactions, A and B, the rate of reaction slows down as time progresses. Why does this happen?
The reactants are being used up in the collisions, so their concentration decreases. This means less frequent collisions until one reactant is used up
Which reaction, A or B, finishes first? How can you tell?
A because the line levels off in the shortest amount of time
What does it show when the line of the graphs has levelled off (gone flat)?
That the reaction has stopped
Which line, A or B, shows the fastest reaction? Explain your choice.
A because it has a steeper slope or there is more gas produced in a shorter time
Which of the following increase the reaction rate? less surface area. lower temperature. increased concentration
increased concentration
What are the two methods for measuring the volume of gas produced in a reaction?
Gas syringe or measuring cylinder filled with water
To slow down a chemical reaction you will do one of the following: Place the reactants in hot water. Place the products in ice bath. Place the reactants in a ice bath. Keep stirring the reactants with a stirring rod.
Place the reactants in a ice bath
Which is the highest concentration? 10m 2M 25 mmol 0.5M
2 M
The major theory of reaction rate is called
Collision Theory
What two things must happen for particles to react?
They must collide and with enough energy for the collision to be successful
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