Science - Rate Of Reaction - vocabulary Flashcards

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1
Q

What is the rate of a reaction?

A

How quickly reactants are used up or products are produced

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2
Q

What is the equation for calculating the mean rate of reaction?

A

mean rate = change in quantity of product or reactant / time taken

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3
Q

What is the unit for rate of reaction in a reaction involving a change in mass?

A

g/s

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4
Q

What is the unit for rate of reaction in a reaction involving a change in volume?

A

cm³/s

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5
Q

What is the activation energy?

A

The minimum amount of energy colliding particles have to have before a reaction will take place

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6
Q

What effect does increasing concentration have on the rate of reaction?

A

Increases

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7
Q

Why does increasing concentration have this effect?

A

More reactant particles in the same volume lead to more frequent collisions

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8
Q

What effect does increasing pressure have on the rate of reaction?

A

Increases

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9
Q

Why does increasing pressure have this effect?

A

Less space between particles means more frequent collisions

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10
Q

What effect does increasing surface area have on the rate of reaction?

A

Increases

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11
Q

Why does increasing surface area have this effect?

A

More reactant particles are exposed and able to collide, leading to more frequent collisions

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12
Q

What effect does increasing temperature have on the rate of reaction?

A

Increases

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13
Q

Why does increasing temperature have this effect?

A

Particles move faster, leading to more frequent collisions - particles have the same activation energy; so more collisions result in a reaction

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14
Q

What is a catalyst?

A

A substance that increases the rate of a reaction but is not used up in the reaction

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15
Q

How do catalysts increase the rate of a reaction?

A

Lower the activation energy of the reaction, so more collisions result in a reaction

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