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PROBLEM SOLVING GRASS stands for G: given

R: required

A: analysis

S: solution

S: statement

CHEMICAL CHANGE

original substance is changed into a different substance

cooking a hamburger

Taste (sweet, sour, salty, bitter)

reacts with oxygen to produce rust

Identify a chemical change

colour change

a solid precipitate forms

gas

PHYSICAL CHANGE

the substance stays the same but its state or form changes

Candle Wax melting

Red

CHANGES OF STATE solid to gas:Sublimation; heat added

Liquid to gas:Evaporation; heat added

Solid to liquid:Melting; heat added

liquid to solid: Freezing; heat removed

gas to liquid: condensation; heat removed

gas to solid: Sublimation; heat removed

Particle Theory particles of a solid very close together, very strong attraction, vibrate in a fixed position

particles of liquid Far apart, somewhat strong, slide passed eachother

particles of a gas very far apart, not strong, very spred out

CONVERSIONS metric conversion saying King Henry Doesn't Mind Drinking Cold Milk

science is DOWNright UPlefting

decimal converting: move the decimal left (positive) right (negative)

MEASUREMENTS

measure the volume of an irregular solid Using an overflow can

measure the volume of a liquid the bottom of the meniscus

OTHER The effect of temperature on the speed of sound in air? Dependent variable & Independent variable DV: speed and sound

IV: teperature

why does a balloon shrink when cooled? When the balloon is warm the particles move fast. as it cools the particles slow down making the walls of the ballon shrink.

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