Unit 2: 2.3

Question 1

Can be measured or observed withoout changing the compositon of matter (ex: color, odor, volume, density, melting point, boiling point, ductility, malleability, conductivity, sate, solubility)

Answer 1

Physical property

Question 2

How a substance reacts with something else (if it will or won’t react)
Ex: flammability, stability, and combustibility

Answer 2

Chemical property

Question 3

The original substance still exists, it has only changed in forms
(Ex: rippping paper, phase changes)

Answer 3

Physical change

Question 4

When a given substance changes into entirely new substances with different properties.
(Ex: silve tarnishing, plants growing, digestion of food)

Answer 4

chemical change

Question 5

Chemical changes are called ________

Answer 5

Reactions

Question 6

1) a color change
2) an energy change (endothermic + exothermic)
3) a precipitate (solid) is formed
4) a gas is formed (bubbles form)

Answer 6

Clues that a chemical reaction may have occurred

Question 7

The decomposition of a compound by electric current

Answer 7

Electrolysis