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Chemical and Physical Changes

In this worksheet, students will be introduced to the differences between physical and chemical changes from a matter in physics perspective.

'Chemical and Physical Changes' worksheet

Key stage:  KS 3

Curriculum topic:   Physics: Matter

Curriculum subtopic:   Physical Changes

Difficulty level:  

Worksheet Overview

QUESTION 1 of 10

There are two types of changes in the world around us: physical and chemical

 

Physical changes

 

If you let ice melt, it turns into water. There has been a change of state from solid to liquid, but it is still the same substance. It is easy to freeze water and make it ice again. You can even boil it and make it steam. It is still the same substance and no new substances have formed. These changes are reversible, which means the substance can turn back to its original state. These are called physical changes.

 

In physical changes the atoms remain the same and no chemical bonds change. For example, in water, two hydrogen atoms are still bonded to an oxygen atom, regardless of whether you have ice, water or steam. 

 

Different states of matter

 

Chemical changes

 

Chemical changes take place during chemical reactions.

 

 

In the image above, rearrangement of atoms is clearly shown for the production of ammonia: you can see one hydrogen atom from the water molecule joining the ammonia molecule, which now becomes NH4 (ammonium). The atoms remain the same, but their positions are rearranged, which means they bond with different atoms after the chemical change.

Chemical changes are permanent changes and cannot be reversed; they are irreversible. When a piece of wood burns, you cannot reverse the reaction to get the wood back. New substances have formed.

What is the new substance formed, when ice melts into water?

water

steam

There is no new substance.

What type of change takes place when you boil water and it turns into steam?

chemical

physical

What do we call a reversible change?

A change that can be reversed.

A chemical change where atoms can reverse back to their old positions.

What type of change takes place when you dissolve sugar in tea?

chemical

physical

What type of change occurs when shredding paper?

chemical

physical

What is the main difference between chemical and physical changes?

Physical changes are irreversible.

Physical changes are reversible.

Physical changes have new moleculess formed.

How are new substances formed in chemical changes?

Atoms of the substance dissolve in the other substance.

Bonds between atoms weaken and they change state.

Atoms rearrange to bond with different atoms.

Tick the two chemical changes in the list below.

mixing sand and water

rusting

crushing a can

breaking glass

burning

What type of change occurs when cooking an egg?

chemical

physical

What type of change occurs in the food in your body after you have digested your food and it's arrived in your cells?

chemical

physical

  • Question 1

What is the new substance formed, when ice melts into water?

CORRECT ANSWER
There is no new substance.
EDDIE SAYS
There is no new substance formed, when ice melts into water. It is still water, but in a different state.
  • Question 2

What type of change takes place when you boil water and it turns into steam?

CORRECT ANSWER
physical
EDDIE SAYS
Water boils and turns into steam, but it is still water. This is a physical change.
  • Question 3

What do we call a reversible change?

CORRECT ANSWER
A change that can be reversed.
EDDIE SAYS
A reversible change is a physical change. The substance remains the same, but is in a different state; it can turn back to the previous state.
  • Question 4

What type of change takes place when you dissolve sugar in tea?

CORRECT ANSWER
physical
EDDIE SAYS
Dissolving is a physical change. There are no new substances made; sugar is still sugar, but it is dissolved (mixed) amongst the molecules of water.
  • Question 5

What type of change occurs when shredding paper?

CORRECT ANSWER
physical
EDDIE SAYS
Shredding paper is a physical change. The paper is just cut into smaller pieces, but it is still paper.
  • Question 6

What is the main difference between chemical and physical changes?

CORRECT ANSWER
Physical changes are reversible.
EDDIE SAYS
Physical changes are reversible, whereas chemical changes are permanent, thus, irreversible.
  • Question 7

How are new substances formed in chemical changes?

CORRECT ANSWER
Atoms rearrange to bond with different atoms.
EDDIE SAYS
In a chemical change, atoms rearrange to bond with different atoms; that's how new substances form.
  • Question 8

Tick the two chemical changes in the list below.

CORRECT ANSWER
rusting
burning
EDDIE SAYS
Rusting and burning are two examples of chemical reactions. New substances are formed and you can't get back the initial substance.
  • Question 9

What type of change occurs when cooking an egg?

CORRECT ANSWER
chemical
EDDIE SAYS
Cooking is a chemical reaction of everyday life. After you boil an egg, you cannot make it raw again.
  • Question 10

What type of change occurs in the food in your body after you have digested your food and it's arrived in your cells?

CORRECT ANSWER
chemical
EDDIE SAYS
The metabolism of food in the body is a chemical change. Food molecules are broken down (digested), but sugar molecules (for example) are still sugar molecules. Once they arrive at your cells they are chemically changed as the energy they contain is used.
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