mixtures
list the six principals of particle theory
1.everything is made out of particles
2. there are spaced between particles
3. temperature affects the speed that particles move
4. particles are always moving because they have kinetic energy
5. particles are attracted to each other
6. there are different particles but particles of one substance are identicle
what is a compound
a compound is a molecule as well because compounds have more then two atoms bonded together. compounds are special kinds of substances that are made up of two or more elements
what is a pure substance
a pure substance is a type of matter that is composed of o single type of atom, molecule, or ion.
what is a mixture
a mixture is a type of matter that has two or more pure substances that are physically combined, not chemically.
properties of pure substances
answers may vary
characteristics of water
water is a good soluvent
water is denser in its liquid form
water in its pure form is a poor conductor
water has a neutral ph
water has a boiling point
water has a freezing point
water has no taste, color or odour
water is not flammable
water is relatively unreactive
what are elements
elements are the simplest types of chemical substances that cannot be broken down into simpler substances by chemical means. there are 118 elements in total
why do we need elements
elements are the building blocks of matter, they are essential to the function of the world
say you have a bowl of salad with different vegetables (mushrooms tomatoes lettuce cucumbers onions etc) what properties would you use to separate them?
answers may vary
what is the difference between a pure substances and mixtures
pure substances have a fixed composition, mixtures can vary