Question

please help me quickly plz
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Answer 1

1. beat the heat. : to remain cool in hot weather His favorite way of beating the heat is to have a couple of cold beers.
2. Salt (sodium chloride) is made from positive sodium ions bonded to negative chloride ions. Water can dissolve salt because the positive part of water molecules attracts the negative chloride ions and the negative part of water molecules attracts the positive sodium ions.
3. An earthquake is the shaking of the surface of the Earth, resulting from the sudden release of energy in the Earth's lithosphere that creates seismic waves.
4. The temperature of the reverse change from liquid to solid is called the freezing point or crystallization point. For most substances the melting point and freezing points are equal. For ice, the melting point is 0°C or 273K.
5. Breaking of a tumbler is a physical change as after it breaks, no new substance is formed. It still has the properties of glass but it is broken into pieces. Burning of a paper is a chemical change as after it burns it turns to ash and has no properties of paper