Rates Of Reaction And Temperature Flashcards

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1
Q

What are the main factors that affect reaction rate?

A

Concentration, pressure, temperature and surface area

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2
Q

What is concentration?

A

Measure of amount of particles in a given area. You can get higher concentration by increasing the amount of particles or decreasing the volume.

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3
Q

What is pressure?

A

When you compress gas particles closer together.

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4
Q

What do gas particles have to do to react and what is it called when this happens?

A

They have to collide with each other at a sufficient speed (fruitful collision).

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5
Q

How can RoR be measured with gasses?

A

RoR = number of fruitful collisions/second

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6
Q

When ___ is ___ the ___ will ___

A

When PRESSURE is INCREASED the VOLUME will DECREASE

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7
Q

How does a higher temperature increase RoR?

A

The higher the temperature, the more kinetic energy the particles will have. This means that they will vibrate more and move quicker.

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8
Q

How does surface area increase RoR?

A

If particles are reacting with one object, there is not much surface area and less particles will be able to react with the surface at a given point. When this object is divided into two, there is more surface area and more particles can react with the surace at a given point.

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9
Q

If two molecules, A2 and B2, react with eachother to get another molecule, write an equation to present this.

A

A2+B2 –> 2AB

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10
Q

What is an endothermic reaction?

A

A reaction where more energy is taken in to break bonds than to make new ones

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11
Q

What is an endothermic reaction?

A

A reaction where less energy is taken in to break bonds than to make new ones.

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12
Q

Explain in terms of particles why a larger surface area increases the rate of a reaction

A

The larger the surface area means the more particles that will be able to react with the surface at a given time.

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13
Q

Explain in terms of particles why a catalyst increases rate of reaction

A

A catalyst reduces the activation energy and because of this there are more fruitful collisions between particles.

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14
Q

When a catalyst is used in an experiment it is not ___

A

Used up

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15
Q

Different substances may need ____

A

Different catalysts to speed up the rate of reaction

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16
Q

Explain in terms of particles why concentration speeds up rate of reaction.

A

The higher concentration means the closer particles are together. Because of this, there is less space for particles to move around meaning more frequent collisions.

17
Q

A student investigated the RoR of magnesium and hydrochloric acid.
He put magnesium into several different test tubes with different concentrations.
Give two variables he should control

A

Mass and surface area of magnesium

18
Q

The RoR can be calculated with the change in _ over change in _

A

y, x