When the temperature of a metal rod increases, what usually happens to its length?, It becomes shorter, It expands and becomes longer, It changes into a liquid, It breaks into pieces, What type of change occurs when ice melts into water?, A new substance being formed, A physical change, The water changes its color, The water changes its taste, When air inside a balloon is heated, the balloon becomes larger. This is because:, the air particles disappear, The balloon freezes, The air expands when heated, The air changes into a solid, What happens to most solids when they are cooled?, They expand, They shrink, They melt, They turn into gas, Melting chocolate on a warm day is an example of:, Physical change, A new material being formed, expanding, shrinking, Which of the following is a result of cooling?, Water boiling, Ice melting, Metal shrinking, Balloon expanding, Why is melting a physical change?, It forms a new substance, The substance stays the same material, It creates a smell, It changes color, Which statement is TRUE?, Heating always turns solids into liquids, Cooling causes all objects to expand, Heating usually makes materials expand, Cooling has no effect on size, What happens to wax when it is heated?, It becomes a gas , It changes into liquid, It forms a new substance, It breaks apart.

Topic 2 Lesson 2 Physical Changes

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