1. Changes in Matter Physical phase changes dissolving crushing tearing
_________ Changes – identity of substance does _____ change
Examples:
_____________
__________
_________
_______
not
phase changes
dissolving
crushing
tearing

2. Changes in Matter Chemical water
________ Changes – identity of substance changes; _____ substance formed because atoms are rearranged
Examples:
hydrogen + oxygen _______
hydrochloric acid + sodium hydroxide ______________
+ ________
new
water
sodium chloride
water

3. Changes in Matter left right
Reactants – substances on ____ side of arrow
Products – substances on ______ side of arrow
hydrogen + oxygen water
hydrochloric acid + sodium hydroxide
sodium chloride water
right

4. Evidence of a chemical change:
bubbling
Gas (or smoke) production – _________, new _______
odor
When vinegar and baking soda are mixed, the solution bubbles as carbon dioxide forms.

5. Evidence of a chemical change:
Precipitate formation – two ____ solutions produce a ______ substance when mixed
clear
cloudy
When solutions of sodium sulfide and cadmium nitrate are mixed, cadmium sulfide, a solid precipitate forms.

6. Evidence of a chemical change:
Energy release or absorption – ____, ____
heat
light
When aluminum reacts with Iron (III) oxide in the clay pot, energy is released as heat and light.

7. Evidence of a chemical change:
Color
______ change in the reaction system
When phenolphthalein is added to ammonia dissolved in water, a color change from colorless to pink occurs.