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Chemistry Rev 4th Form > 4.3 Rates of Reaction > Flashcards

4.3 Rates of Reaction Flashcards

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1
Q

What is rate of reaction?

A

Change in quantity of reactants or products per unit time

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2
Q

What does collision theory state?

A

For a reaction to occur particles MUST have: at least an activation energy and collide

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3
Q

What does it mean if the collisions are more frequent/ faster?

A

Rate of reaction increases

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4
Q

Name 5 ways you can increase the rate of reaction?

A
  1. Increase the temperature
  2. Increase the SA of solids
  3. Increase concentration of solution
  4. Increase the pressure of gases
  5. Add a catalyst
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5
Q

How does increasing the concentration of a solution alter reaction rate?

A
  • Increasing concentration of a solution increases the
    rate of a reaction
  • There are more particles in the same volume
  • There are more frequent collisions
  • So there are more frequent successful collisions
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6
Q

How does increasing the surface area increase reaction rate?

A
  • More particles are accessible at the surface
  • There are more collisions per unit time
  • There are more successful collision per unit time
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7
Q

How do you change the SA?

A

Make something larger or smaller

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8
Q

How does increasing the temperature increase reaction rate?

A
  • Particles have more kinetic energy so there will be more frequent collisions
  • A higher proportion of particles have at least the activation energy
  • Therefore a higher proportion of collisions are successful
  • There will be more successful collisions per unit time
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9
Q

What is a catalyst?

A

A chemical that speeds up a reaction without getting used up

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10
Q

How does a Catalyst affect the rate of reaction?

A

Provides an alternate reaction pathway with a lower activation energy

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11
Q

Name 3 catalysts?

A
  • Manganese Oxide
  • Iron Oxide
  • lead Oxide
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12
Q

Which of the following increases the proportion of successful collisions?
a. Increasing surface area
b. Increasing temperature
c. Increasing concentration
d. Adding a catalyst
e. Increasing the pressure of a gas

A

a. X
b. Y
c. X
d. Y
e. X

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13
Q

Describe parts of the method for seeing how concentration affects the rate of reaction? (cross)

A
  • Measure out 20 cm of HCL in a conical flask
  • Place conical flask on black cross.
  • 30 cm of distilled water to flask
  • Add 10 cm of Sodium Thiosulphate to flask and start timer
  • Wait for the cross to become non visible and record the time
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14
Q

What will you change when seeing how the concentration affects the rate of reaction?

A

Increase the volume of Sodium Thiophosphate
And decrease the volume of water

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15
Q

What is the Conclusion of the test of Concentration affecting the rate of reaction?

A

As the concentration increases the rate of reaction increases –> More Thiophosphate ions ions in the same volume meaning more frequent collisions

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16
Q

Describe parts of the method for seeing how Surface Area affects the rate of reaction? (upside down)

A
  • Measure out 3g of CaCO3 in a conical flask
  • Set up a delivery tube and an inverted 50cm measuring cylinder in water filled water trough
  • measure out 20cm of HCL and pour in flask placing a bung on top.
17
Q

What will you change when seeing how Surface Area affects the rate of reaction?

A

Size of the CaCO3 (marble chips) every time. 3x

18
Q

Describe parts of the method for seeing how temperature affects the rate of reaction? (ribbons)

A
  • measure 20cm of HCL
    in a boiling tube
  • Cut pieces of Magnesium to 2cm
  • Half fill a beaker with hot water to act as a water bath
  • When HCL has reached a certain temp place on a test tube rack and place Mg to HCL.
  • Stop timer when Mg has completely dissolves
19
Q

What will you change when seeing how temperature affects the rate of reaction?

A

Change the temperature of HCL

20
Q

What is the Conclusion of the test of temperature affecting the rate of reaction?

A

As temperature increases so will the rate of reaction

21
Q

Give the test for carbon dioxide?

A

Bubble the gas through limewater, if it turns cloudy then CO2 is present

22
Q

Give the test for Oxygen?

A

Re-light a glowing and if lights the O2 is present

Chemistry Rev 4th Form (5 decks)

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