concept 2.2 grade 6
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(write the scientific term) A form of energy that gained or lost by the matter to change its state
thermal energy
(Write the scientific term) The mass of a substance doesn't change when this substance changes from one state into another
law of conservation of mass
(Give reason) The mass of ice cubes before melting equals to their mass after melting
because the mass of ice doesn't change when it melts from solid state to liquid state according to the law of conservation of mass
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