C8 Revision For Mock Flashcards

1
Q

Exothermic reaction

A

A reaction in which energy is transferred from the reacting substance to the surroundings

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2
Q

Endothermic reaction

A

A reaction in which energy is transferred to the reacting substance from their surroundings

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3
Q

Everyday use of exothermic reaction

A

Chemical Hand warmers and body warmers

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4
Q

Every day use of endothermic reaction

A

Chemical cold packs

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5
Q

What do chemical cold packs contain

A

Ammonium nitrate and water.When it dissolves it absorbs energy from it’s surroundings making them colder

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6
Q

What are chemical cold packs used for

A

Used as emergency treatment for sports treatment

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7
Q

Collision Energy

A

The reacting particles need to collide with each other with enough energy to cause a reaction to take place

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8
Q

Reaction Energy

A

The minimum amount of energy that particles need before they can react.

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9
Q

Factors affecting reaction rate (temperature)

A

Increasing the temperature makes the particles faster so they are more likely to collide with each other more often .

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10
Q

Factors affecting the rate of reaction (increase the concentration)

A

A concentrated solution will react faster than a dilute solution.This increases the number of reacting particles in the same space,so there is more chance they will collide

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11
Q

Factors affecting reaction rate (increase the surface area)

A

More particles are on the surface.By increasing the surface area there are more areas where reactants can collide with each other.

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12
Q

Catalyst

A

A catalyst is a chemical that helps a reaction to happen faster but is not used up itself.It lowers the amount of energy that particles need to collide with for a reaction to happen.

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13
Q

How do you find out the rate of reaction (measuring the decreasing mass of a reaction mixture)

A

As the reaction takes place,the mass of the reaction mixture decreases.You can measure and record the mass at regular time intervals.

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14
Q

How can you find out the rate of reaction (measuring the increasing volume of gas given off)

A

If you use a gas syringe to collect the gas you can measure the volume given off at time intervals.

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15
Q

How can you measure the rate of reaction(measuring the decreasing light passing through a solution)

A

Some reactions in solution makes a suspension of an insoluble solid(precipitate).This makes the solution go cloudy?You can use this to measure the rate at which the precipitation appears.

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16
Q

How to measure the rate of reaction (measuring the time for a solution to go cloudy)

A

You can measure the rate of reaction by timing how long it takes until you cannot see the cross.

17
Q

How to calcualate the mean rate of reaction

A

amount of reactant used or product made over time