Rates Of Reaction Flashcards

1
Q

What is Activation energy? (2)

A
  • The minimum amount of energy
  • required for a reaction to occur
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2
Q

In terms of particles, how does Temperature affect the rate of a reaction? (6)

A
  • increased temperature increases rate of reaction
  • particles gain kinetic energy
  • particles move faster
  • more chance of collisions
  • resulting in more successful collisions (enough activation energy)
  • in a given time
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3
Q

In terms of particles, how does concentration affect the rate of a reaction? (5)

A
  • increased concentration increases rate of reaction
  • more acid particles in the same volume
  • more chance of collisions
  • resulting in more successful collisions
  • in a given time
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4
Q

In terms of particles, how does surface area affect the rate of a reaction? (5)

A
  • increased surface area increases rate of reaction
  • more particles on the surface exposed to the other reactant
  • more chance of collisions
  • resulting in more successful collisions
  • in a given time
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5
Q

What is activation energy (2)

A
  • The minimum amount of energy required
  • For reaction to happen
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6
Q

What is a catalyst (2)

A
  • Substance that speeds up the rate of a chemical reaction
  • without being used up
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7
Q

How do catalysts work? (2)

A
  • They provide an alternate reaction pathway
  • with lower activation energy
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8
Q

How does pressure increase the rate of a reaction? (2)

A
  • More particles in a smaller volume
  • More frequent collisions
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9
Q

What is gas pressure?

A

the force that the gas exerts on the walls of its container

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10
Q

What is the formula for rate?

A

1 / time

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11
Q

How can you see the rate of a reaction from a graph?

A

Steeper gradient - faster rate

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12
Q

What is the catalyst for hydrogen peroxide?

A

Manganese dioxide
(Or Manganese(IV) oxide)

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13
Q

why is cotton wool put on the top of a conical flask in the reaction between CaCO3 and HCl?

A

To avoid loss of mass by spray

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14
Q

What is the balanced symbol equation for the reaction between CaCO3 and HCl

A

CaCO3 + 2HCl —> CaCl2 + H2O + CO2

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15
Q

How can you increase the rate of the reaction between CaCO3 and HCl

(3)

A
  • increase the surface area of the CaCO3 (limestone/marble chips)
  • increase the concentration of the acid
  • increase the temperature
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16
Q

What is the balanced symbol equation for the decomposition of hydrogen peroxide?

A

2H2O2 —> 2H2O + O2