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introduction to Physical and chemical change.

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introduction to Physical and chemical change.

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Around us things  change.  It is important to learn how matter changes. As it can be a matter of survival (surviving cold winter with wood fire) or it can bring jobs (making nice concrete pillars  from cement and sand)
below are other examples of thing matter changing
examples
e.g.  frozen ice melting to water. (see  picture in Power point slides provide on this padlet) .

e.g.  Mom processing raw food to delicious meal with porridge and relishes (I can recall the different colours of my granny Sunday Plate.....you also look at slide on this padlet for pics )

ACTIVITY 1!!!!
"at the bottom of this column give one or two example of material that change around you?'

NOW its good time to watch a video below. look at several example giving in the video about changes in day to day situation.

In chemistry we differential between two kinds of change
1. Physical change
2. chemical change

in this module we will discuss each change through defining it to exactly know what it is.
then go through characteristics which will help us know if a change is physical or chemical
examples will help us to understand the concept even further.

ACTIVITY 2!!!!!!!
think about all aspects of Burning a candle:
1.  is it Physical change or chemical change
2. explain your answer........
add you answer at the bottom of this column
watch the video : https://youtu.be/x49BtB5dOwg

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y2mate.com - Physical and Chemical Changes_ Chemistry for Kids - FreeSchool_480p

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introduction
Physical changes in matter

is one where the particles of the substances that are involved in the change are not broken up in any way. the material that make up the substance in the sample remain the same, but change in can in shape, phase in some instances color.

When water is heated for example, the temperature and energy of the water molecules increases and the liquid water evaporates to form water vapour.

Activity 1 !!!

can think of physical Change process where the colour of a substance change?
at bottom of this column Add your response.

properties

1. Arrangement of particles When a physical change occurs, the compounds may re-arrange themselves, but the bonds in between the atoms will not break.

For example when liquid water boils, the molecules will move apart but the molecule will stay intact. In other words water will not break up into hydrogen and oxygen atoms.

2.  Conservation of mass In a physical change, the total mass, the number of atoms and the number of molecules will always stay the same. In other words you will always have the same number of molecules or atoms at the end of the change as you had at the beginning.

3. Energy changes Energy changes may take place when there is a physical change in matter, but these energy changes are normally smaller than the energy changes that take place during a chemical change.
4.  Reversibility Physical changes in matter are usually easier to reverse than chemical changes. Methods such as filtration and distillation can be used to reverse the change. Changing the temperature is another way to reverse a physical change. For example, a mixture of salt dissolved in water can be separated by filtration, ice can be changed to liquid water and back again by changing the temperature.

Activity 2
chose the correct answer add record your response in Add comment at bottom of this column
Physical changes can be brought about by

1 .Cutting

2.Bending

3. Dissolving

.5 All of the following are

watch a video from vodacom e-school below

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introduction
When a chemical change takes place, new substances are formed in a chemical reaction. These new products may have very different properties from the substances that were there at the start of the reaction.

properties

Decomposition of hydrogen peroxide

The decomposition (breakdown) of hydrogen peroxide (H₂O₂) to form water (H₂O) and oxygen gas (O₂) is an example of chemical change.
Activity 1
use google to find more example of synthesis chemical change
record you response at the bottom of this column,  in "add comment'

The synthesis of water

The synthesis (forming) of water (H₂O) from hydrogen gas (H₂) and oxygen gas (O₂) is another example of chemical change.

Activity 2
watch a video from vodacom-eschool below
and Answer the questions below

Q1 What is the difference between a chemical process and a physical process in chemistry?

Q2. When does the breaking of chemical bonds release energy?

Q3. Why is mass conserved in chemical reactions?

record you answer at bottom of this column

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microscopic differentiation of physical and chemical change

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microscopic differentiation of physical and chemical change

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Activity
watch a video from Dr stott website

Activity!!!!
Try to explain the same concept using H ₂ S

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this are slide used in my teaching video

Activity 1
go through the slide below.
use the slide below to teach members of your family or fellow learner difference between physical change and chemical change....have fun !!!

when finished kindly share your teaching experience by telling use your experience at bottom of this column