Question

Table 4.3 Mixing different solid
materials in water
Substance
Disappears in water/
does not disappear
Disappears completely in
water
Salt
Sugar
Sand
Chalk
powder
Sawdust
You will notice that some substances
have completely disappeared or
dissolved in water. We say that these
substances are soluble in water. Other
What is answer of sugar

Answer 1

Answer:

salt=disappears in water

sugar=disappears in water

sand=does not disappears

chalk powder=does not disappears

sawdust= does not disappears

Answer 2

Answer:

Salt will disappear in water.

Sugar will disappear in water.

Sand will not disappear in water.

Chalk powder will not disappear in water.

Sawdust will not disappear in water

Explanation:

The molecules of the liquid and solid must attract one another, For a liquid to dissolve a solid.

• Water molecules pull the ions of salt apart by breaking the ionic bond that linked them together. After the salt compounds are pulled apart, the atoms present in salt are surrounded by water molecules. The salt is dissolved and a homogeneous solution is obtained. Therefore, salt disappears in water.
• In sugar or sucrose, the bond between the oxygen and hydrogen atoms gives the hydrogen a slight positive charge and the oxygen a slight negative charge. Sucrose is a polar molecule. The polar water molecules attract  the polar sucrose molecules which makes sucrose dissolve in water. Therefore sugar disappears in water.
• Sand does not dissolve in water. Sand settles down the bottom. Therefore sand does not disappears.
• Calcium carbonate is the main component in chalk powder. In water the solubility of calcium carbonate is extremely low.  Therefore chalk powder does not disappear in water. The chalk powder settles down in water.
• Sawdust is insoluble in water, therefore it does not disappear. saw dust is waste product of wood work.

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