A water molecule has the chemical formula H2O. This means that the water molecule is made up of

The atoms in a water molecule are held together by covalent bonds. This means that the bonded atoms

The water molecule is a polar molecule. A water molecule is polar because

The water molecule is

Water molecules are attracted to each other because

A paper clip can stay on the surface of a sample of water because of water’s strong surface tension. Water’s surface tension is mostly a result of

Sodium chloride is made up of sodium ions and chloride ions which bond together in a salt crystal because

Water is able to dissolve sodium chloride because

Water cannot dissolve all substances that are made from ionic bonds. This is probably because

The chemical formula for sucrose (sugar) is C6H12O6. In some parts of the sucrose molecule, oxygen is covalently bonded to hydrogen. This makes the sucrose molecule

Sucrose dissolves well in water because

When sucrose dissolves in water

Alcohol molecules are not as polar as water molecules. If you mixed sucrose in alcohol you might expect the sucrose

Dissolving often involves a solid dissolved in a liquid. In this type of dissolving

Sugar is more soluble at higher temperatures. This is mainly because at higher temperatures

Water is not a good dissolver of oil mainly because

Carbon dioxide gas dissolves pretty well in water because

The amount of gas that can dissolve in water

When certain substances dissolve, the solution gets warmer. This type of dissolving process is exothermic. In exothermic dissolving

When certain substances dissolve, the solution gets colder. This type of dissolving process is endothermic. In endothermic dissolving

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