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A certain compound contains 22.7% of zinc, 11.0% sulphur, 22.3% oxygen and the rest is water of crystallization. Derive the systemic formula of the compound if it's relative atomic mass is 287. Given ( Zn=65, O=16 H=1 S=329

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COMPOUNDS AND MIXTURES.

TODAY LETS PROCEED WITH THE STUDY OF MATTER BY LOOKING ON PHYSICAL CHANGES AND CHEMICAL CHANGES OF MATTER.
Physical change is the change of matter which no new substance formed.
Or
Is the reversible change of matter. Example change of water to ice.
Chemical change is the change of matter which new substance formed.
Or
Is irreversible change of matter. Example rotten of fruit.
DIFFERENCE'S BETWEEN PHYSICAL CHANGE AND CHEMICAL CHANGE.
1.Physical change no new substance formed WHILE Chemical change new substance formed.
2. Physical change is the reversible change of matter WHILE Chemical change is irreversible change of matter.
3. Physical change affects physical properties of matter WHILE Chemical change affects chemical properties of matter.
4. Physical change does not affect the composition of matter WHILE Chemical change affect the composition of matter.

TODAY LETS SUMMARIZE THE CHANGES OF STATES OF MATTERS.
Matter can be changed from one state to another State the following are the processes of changes of states of matter.
Changing from solid to liquid the process is called melting.
Changing from liquid to gas the process is called evaporation.
Changing from gas to liquid the process is called condensation.
Changing from liquid to solid the process is called freezing.
Changing directly from solid to gas the process is called sublimation.
Changing directly form gas to solid the process is called deposition.

TODAY IN THE DISCUSSION WE START ABOUT THE MEANING OF CHEMISTRY.
chemistry is the scientific study that deals with matter and their properties.
Also chemistry can be explained as;-
The scientific study of composition and decomposition of matter.
This mean in chemistry we study mostly about matter.
Matter is anything which has mass and occupies space.
Matter can be occur in three main States which are solid state example stones, liquid state example water and gaseous state example oxygen gas

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