chemistry Flashcards
Expansion:
Expansion: it is when the particals heat up tso much that they vibrate fast and spred out eg tking more room
) Physical Change:
b
) Physical Change: A change where no new substance is produced.
Examples of Changes
Physical Changes:
Examples of Changes
Physical Changes:
Melting ice
Boiling water
Breaking glass
Dissolving sugar in water
Chemical Changes:
Chemical Changes:
Rusting iron
Burning wood
Baking a cake
Digesting food
: Indicators of Chemical Change
: Indicators of Chemical Change
Color change
Gas production (bubbles)
Temperature change (heat/light)
Formation of a precipitate (solid)
Changes of State
Heating Solid to Gas:
Palm Card 5: Changes of State
Heating Solid to Gas:
Solid to Liquid: Melting
Liquid to Gas: Boiling/Evaporation
Cooling Gas to Solid:
Cooling Gas to Solid:
depsostion
Chemical Needed for Combustion:
Chemical Needed for Combustion: Oxygen
Compressibility of Gases vs. Solids/Liquids:
Gases are compressible because particles are far apart and can be pushed closer together.
Solids and liquids are incompressible because particles are closely packed with little space to compress further.
Physical Changes in Recycling Aluminum:
Melting, casting, and solidifying
Candle Burning:
Physical Change: Melting of wax
Chemical Change: Burning of wax to produce light, heat, carbon dioxide, and water vapor
Heating Solid to Liquid:
sublation Particles gain energy, vibrate more, and break free from fixed positions to move past each other.
Heating Liquid to Gas:
evapartoion articles gain more energy, move faster, and spread out to form a gas.
Dissolving Solute in Solvent:
Solute particles spread out and mix uniformly with solvent particles.
Expansion:
When a substance is heated, the particles gain kinetic energy.
This increased energy causes the particles to vibrate or move more vigorously.
As the particles move more, they tend to push away from each other, causing the material to expand.