Rates Of Reactions Flashcards

1
Q

If the temperature rises during a reaction, what is the name of this type of reaction

A

Exothermic

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2
Q

What is produced in a reaction if effervescence occurs?

A

A gas

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3
Q

Name two ways to collect a gas given off in a chemical relation

A

Downward displacement of water

Gas syringe

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4
Q

What are physical changes?

A

Physical changes are not chemical reactions as no new substance is produced

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5
Q

Name 3 physical changes

A

Possible answers

Dissolving 
Evaporating
Freezing
Melting
Cutting into smaller pieces
Condensation
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6
Q

The smaller the particle size the

A

Faster the reaction

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7
Q

The larger the partial size

A

The longer the reaction

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8
Q

The more concentrated the solution

A

The faster the reaction

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9
Q

The higher the temperature

A

The faster the reaction

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10
Q

The lower the temperature

A

The slower the reaction

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11
Q

Reactants ->

A

Products

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12
Q

When the temperature falls the name of the reaction is a

A

Endothermic reaction

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13
Q

What is the definition of a catalyst

A

A catalyst speeds up a chemical reaction without being used up or remaining chemically unchanged

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14
Q

What is a biological catalyst

A

An enzyme is a biological catalysts

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15
Q

What is the equation for the average rate of reaction

A

Average rate = change in factor
——————————
Time taken for change

Found On page 3 of the data book

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16
Q

Name 3 signs that a chemical reaction is taking place

A
A smell is produced 
A solid is produced 
A colour change 
Temperature change 
Fizzing (effervescence)