Chemistry

• Physical change only changes the state of matter, but not the composition of the substance.
• A chemical change can be identified if there is a change in colour or temperature or if the reaction produces light
• Chemical changes are irrevesible
• Mixture: a substance made by mixing other substances together
• Molecules Two or more atoms chemically combined togther
• Condensation is the state change from gas to liquid
• Matter is anything that takes up space and has mass.
• Solid - particles close together with strong forces between them
• Solids cant be compressed
• Particles in a gas move quickly in random direction
• Mass is a measure of how much matter there is in an object, while weight is a measure of the size of the pull of gravity on the object