2B-Physical & Chemical Changes of Matter

Question 1

physical change

Answer 1

alters the physical state of a substance without changing its chemical composition or forming a new product ie:melting of metal, condensation of a liquid, tearing a piece of paper, breaking a drinking glass

Question 2

chemical change

Answer 2

chemical reaction accurs, bonds are broken and formed creating new products that have different chemical properties from the original

Question 3

3 types of chemical change reactions

Answer 3

neutralization reaction:equal combination acid & base
decomposition reaction: break down of larger molecule
synthesis reaction: combine to form larger molecule

Question 4

law of conservation of mass and energy

Answer 4

Antoine Lavoisier: states that atoms and energy cannot be destroyed in a chemical reaction

Question 5

Potential Energy

Answer 5

stored energy

Question 6

Kinetic energy

Answer 6

the energy of motion or action

Question 7

energy is measured with 2 units

Answer 7

joule and calorie (cal) the amount of energy needed to raise the temp of 1g of water 1-degree Celsius. 1 cal= 4.184 Joules(j)

Question 8

6 main forms of Energy that can be transformed and transferred

Answer 8

1 Chemical
2 electrical
3 mechanical
4 nuclear
5 radiant
6 thermal