positively charged

neutral

negatively charged

the number of protons

the number of electrons

the number of neutrons

the location of an atom on the periodic table

all the atoms present before a chemical reaction are not present after

atoms present before chemical reactions are present after

new substances and new elements are formed in a chemical reaction

a substance that cannot be split into simpler substances

a substance that can be split into simpler substances

a singular particle of a particular element

another name for an element

2 or more atoms that are combined

A physical change cannot be reversed

A physical change is a change in state

A physical change is a change in form

A physical change is where new substances are formed

change of colour, change of temperature, precipitate (solid) formed, gas released.

change of colour, reversing back to original form, precipitate (solid) formed, gas released.

atoms rearrange and form new bonds to make the products.

atoms remain the same and do not form new bonds to make the proudcts

endothermic

exothermic

respiration

photosynthesis