1) 0 °C is called its melting point. a) true b) false 2) We are unable to see the particles in some solids. a) true b) false 3) the particles consist of two or more atoms joined together. These particles are called Molecules. a) true b) false 4) A gas flows easily. It has a fixed volume, but its shape changes. a) true b) false 5) Water can be a solid (ice), a liquid (water), and a gas (water vapour or steam). Its state can be changed by heating or cooling. a) true b) false

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