Page 36 - prim 5 booklet 2025 Summary bosy_Neat

Delta Modern Language Schools
Science department
Grade 5
1st term 2024 -2025

➢ The masses of substances before mixing are equal to the masses of these substances after
mixing when their properties don’t change. (When forming a mixture).

➢ The total masses of substances after mixing are equal to their total masses before mixing
even if their properties change as they react with each other. (When forming a compound).

Physical change Chemical change

It is a change in matter without any It is a change in matter with a change in its
change in its structure structure producing a new matter.

no change happen in the chemical chemical properties of the substances is
properties of the substances changed

Examples:- Examples:-
➢ Water before and after freezing is ➢ When burning a piece of paper.
➢ When mixing vinegar with baking soda,
still water.
➢ Cutting paper. gas bubbles appear.
➢ Making salad. ➢ Iron rust: iron react with oxygen and
➢ Melting wax – Melting butter.
➢ Coiling a wire to form a spring. water forming rust which is reddish
➢ Food coloring added to cup of
substances called iron oxide.
water. ➢ Making bread – baking cake.
➢ Melting, freezing, evaporation, ➢ Striking a match, producing heat and

condensation. light.
➢ Mixing iodine with corn starch.

Evidences that describe physical changes:-

1- Change in size. Cutting a fruit.

2- Change in shape. The flow of sand in an hourglass.

3- Expected change in color. Coloring a paper.

4- Change in state of matter. Melting a piece of chocolate.

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