Pure Substances
What is a pure substance?
Made of one type of particle: element or compound
Is air a pure substance why or why not.
No. Air is a mixture of several elements and compound: nitrogen, carbon dioxide, and oxygen etc.
What happens to the particles in a solid when thermal energy is added?
speed up
Solid to Liquid
Melting
Give an example of an element and a compound.
Element-gold
Compound- water
What is a mixture.
two or more elements or compounds physically together but not chemically bonded.
Compare the particle movement in liquids to that in gases.
Liquids slide past each other. Gas particles move rapidly and rarely touch each other.
Liquid to gas
Vaporization
What elements make the compound water?
Hydrogen and Oxygen
Define homogeneous mixture and provide an example.
two or more types of particles evenly distributed. Cannot see individual parts
Describe what occurs to the particles in a gas when thermal energy is removed.
the gas loses kinetic energy, slows down and could turn to a liquid.
Gas to liquid
Condensation
Describe a characteristic of a compound that makes it different from elements.
Compounds are made of two or more different elements chemically bonded
Define heterogeneous mixture and provide an example
A mixture not evenly distributed. Can see the different substances.
Explain how the movement of particles in plasma differs from that in solids, liquids, and gases
Plasma has the highest kinetic energy of all states. It moves so fast that particles become charged.
liquid to solid
Freezing
What distinguishes a pure substance from a mixture?
Pure substances are chemically bonded. Mixtures are just elements and compounds placed next to each other.
How to separate the homogeneous mixture, saltwater.
Simply evaporate the water and the salt will be left behind
What three things happen to particles in a substance when thermal energy is added?
1. Speed up
2. Spread out
3. Lose bonding attraction with other particles
Gas to plasma?
Ionization :)