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Chemical Properties. BY: BRIANNA SHIELDS. DO NOW. 1. Which phase of matter has the most tightly packed particles? 2. Which type of phase change requires the addition of heat energy to change a liquid into a gas? 3. Which type of measurement utilizes a triple beam balance?. GOAL.

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chemical properties

Chemical Properties

BY: BRIANNA SHIELDS

do now
DO NOW
  • 1. Which phase of matter has the most tightly packed particles?
  • 2. Which type of phase change requires the addition of heat energy to change a liquid into a gas?
  • 3. Which type of measurement utilizes a triple beam balance?
slide3
GOAL
  • To distinguish between physical and chemical changes
slide4
Chemical Changes

A substance changes into a new and different substance

The atoms are altered

Often involves chemical rx

slide16

Foaming (gas formation)

Ex: antacid in water

slide17

Corrosion due to acids

(bubbling or fizzing)

2 chemical indicators
ACIDS

Corrosive

Sour taste

pH paper 1-6 (reddish)

Turns litmus red

Phenopthalein in acid (no color change)

Vinegar & lemon juice

BASES

Corrosive, slippery

Bitter taste

pH paper 8-14 (bluish)

Turns litmus blue

Phenopthalein in base turns pink

Soaps, cleaning products

2 chemical indicators
acids bases
Acids & Bases
  • Watch the demonstrations at the front counter- are the substances acids or bases? How do you know?
physical or chemical change
Physical or Chemical Change?
  • Painting a statue
  • Chopping wood
  • Crushing sugar crystals
  • Dissolving salt
  • Boiling water
  • Exploding firecrackers
  • Mixing baking soda & vinegar
physical or chemical change21
Physical or Chemical Change?
  • Rotting eggs
  • Crumpling wax paper
  • Slicing cucumber
  • Fizzing antacid in water
  • Lighting a match
  • Zipping a coat up
  • Rusting bike chains