Need a continuous energy source

leaves surroundings feeling cold

more energy needed to break bonds of reactants than is released

some energy is released as light

energy released is greater than energy needed to break bonds

some energy released as heat

cutting paper is an example of a

bending metal is an example of

an example of a physical change is

an example of a chemical change

breaking chemical bonds means a ____________ change has occurred

all changes of state are

forming new bonds means a _____________change has occurred

water turning to steam is a

chemical changes form

The BEST way to know a chemical change occurred

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