Physical and Chemical Change

Question 1

particle theory of matter

Answer 1

every thing is made up of tiny indivisible particles too small to see

Question 2

how are particles arranged in different states of matter

Answer 2

Solid - tightly compacted
Liquid - move freely but stay close to one another
gas - far apart and free

Question 3

chemical change

Answer 3

irreversible . production of gas or smell . bubbles . change of colour . new substance formed . energy production (light, heat ect.)

Question 4

physical change

Answer 4

no new substance formed . not permanent . change of shape . change of state . expansion / contraction . mixing

Question 5

how do substances change state

Answer 5

solid –> liquid –> gas
melt –> evaporate–>
freeze <– condensation <–
solid 2 gas = sublimation
gas 2 solid = deposition

Question 6

reactants and products in chemical reactions

Answer 6

reactants are the starting material products are the end result
reactant –> product

Question 7

law of conservation of mass

Answer 7

in a chemical reaction mass is neither created nor destroyed