Page 50 - Summary 6 2025

Delta Modern Language Schools
Science department
Grade 6
1st term 2024- 2025

Law of conservation of mass:

The mass of a substance doesn’t change Twhen this substance changes from

one state into another. h

e

Notes f
r
o
n
t

m

➢ No matter is destroyed or created but it juust changes from one state
s
into another. c

l

➢ There are some cases that the mass of a esubstance before the change
doesn’t equal the mass of the same substance after the change. G.R

Because the substance is mixed with oth(er substance.

C

➢ If any liquid substance changes into gasoeous state, its mass doesn’t

change after evaporation even we don’t nsee its gas state but it has a

mass that equals its mass before change.t

r

➢ Energy can change from one form to a

anoc ther.

➢ In some cases, when energy changes frotm one form to another, there

is some loss. )

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