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7 2 Chem combo
Yr 7 Ch 2 Chem combo
Term | Definition |
---|---|
Biodegradable | bacteria or fungi breaks down the substance into simpler substances |
Chemical properties | how substances react with other substances |
Compressed | Squashed |
Incompressible | not able to be compressed or squashed |
Non-biodegradable | doesn't rot or break down |
Odour | smell |
Physical properties | describe things about the substance like its appearance, melting, freezing and boiling points and its hardness |
Plasma | the fourth state of matter, found in sparks, lightning bolts and in stars |
States of Matter (phases) | solid, liquid, gas (and plasma at temperatures over 6000 degrees C) |
Atoms | the incredibly tiny particles that make up all matter |
Bonding | forces of attraction that hold particles together |
Brownian Motion | random motion of particles cause by being bumped and jostled by other particles |
Particle Model | the model used to describe and explain the behaviour of particles in solids, liquids and gases. |
Vibration | jiggling about on the spot (moving but staying in place) |
Boiling | when vigorous bubbling appears |
Boilinig Point | the temperature at which a liquid boils: 100 C for water at sea level |
Condensation | removal of heat, changing a gas into a liquid |
Deposition | a gas changing directly into a solid |
Evaporation | heat changing a liquid into a gas |
Freezing (solidification) | removal of heat: changing a liquid into a solid |
Freezing point | the temperature at which a substance freezes: 0 C for water |
Melting | heat changing a solid into a liquid |
Melting Point | the temperature at which a substance melts: 0 C for ice to water |
Steam | condensation of water vapour, forming a visible fog of water droplets |
Sublimation | a solid changing directly into a gas |