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Science > Chemical Reactions > Flashcards

Chemical Reactions Flashcards

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1
Q

Give 6 things that can happen when a chemical reaction occurs:

A
  • Temperature change
  • Gas is produced
  • Explosion
  • Colour change
  • Dissolving
  • Sound
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2
Q

What is the definition of a chemical reaction?

A

A chemical reaction is a change that results in the formation of one or more new substances

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3
Q

How does a chemical reaction work?

A

The reactants are formed into new products

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4
Q

What are the two types of changes?

A

Physical & chemical

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5
Q

What is a physical change?

A

The change of a substance from one state to another

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6
Q

Is a new substance formed during a physical change?

A

No

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7
Q

Give 3 examples of a physical change :

A

Glass breaking, Ice melting folding paper

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8
Q

What physical change is generally considered a chemical change?

A

Water melting

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9
Q

Give an example of a chemical change

A

Rusting

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10
Q

Can chemical changes be reversed? Give an example of why?

A

No. Baking a cake you cannot take the flour back out

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11
Q

What do chemical reactions involve? Give an example

A

An energy change, eg fireworks give off light, heat & sound

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12
Q

Give 3 signs of a chemical reaction

A
  • gas is produced
  • a colour change
  • heat is produced
  • light is produced
  • sound is produced
  • electricity is produced
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13
Q

When was Antoine Lavoisier alive?

A

1743 - 1749

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14
Q

What was Antoine Lavoisier Law?

A

Law of Conservation of Mass

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15
Q

What did Antoine show?

A

He showed that mass was not created or lost in a chemical reaction

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16
Q

What does the Law of Conservation of Mass state?

A

It states that matter cannot be created or destroyed, but can only be changed from one form to another

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17
Q

In any chemical reaction what is always equal?

A

The total mass of the reactions & the total mass of the products

18
Q

What is a reactant?

A

Substances that react together

19
Q

What is a product?

A

They are the substances that are formed by the end of a chemical reaction

20
Q

What is the definition of activation energy?

A

The minimum energy needed to start a chemical reaction

21
Q

What is an exothermic reaction?

A

When after the reaction the energy is lower then it was before

22
Q

What is an endothermic reaction?

A

After the reaction the energy is higher than at the start

23
Q

What is the definition of rate of reaction?

A

It is the change in concentration per unit of time of any one reactant or product

24
Q

How do we measure the rate of reaction?

A

We measure it by measuring how the concentration ( how much of something you have) of any one reactant or product changes with time

25
Q

What is the formula for the rate of reaction?

A

Change in concentration of any reactant/
Time taken

26
Q

What causes chemical reactions?

A

Collins between particles are what causes chemical reactions

27
Q

What happens when particles collide really fast?

A

The reaction is more likely to happen

28
Q

Give the 5 factors affecting the rate of reaction:

A
  1. Types of reactants
  2. Particle size
  3. Concentration
  4. Temperature
  5. Catalysts
29
Q

What does the rate of reaction depend on, in relation to types of reactants?

A

It depends on the type of chemicals reacting together

30
Q

What does the rate of reaction do in relation to the concentration?

A

Increases

31
Q

Is a larger or smaller particle better for faster reactions?

A

Smaller

32
Q

What happens you increase the particle size ?

A

It increases the number of particles that are exposed to other reactants

33
Q

Is the rate of reaction greater at higher or lower temperatures ?

A

Higher

34
Q

Whats the definition of a catalyst?

A

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

35
Q

What are biological catalysts?

A

Enzymes

36
Q

Give 2 examples of biochemical reactions:

A
  • photosynthesis
  • digestion
37
Q

What is a biochemical reaction?

A

A reaction that is occurring inside something that is biological

38
Q

What is the branch of science called that studies chemical reactions in living things?

A

Biochemistry

39
Q

Are their chemical reactions occurring in your body everyday? If so, how many?

A

Yes, thousands

40
Q

What is quantitative data? Give an example.

A

Data consisting of numbers. Shoe size

41
Q

What is qualitative data?

A

Data consisting of words. Favourite colour

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