2. What is a Pure Substance?
Made of Elements and Compounds
Same molecules throughout
3. What is an Element
Type of pure substance
One type of molecule throughout
100 types of elements
Most solid at room temperature
Ex: Mercury (Hg), Oxygen (O)
4. What is a Compound?
Type of pure substance
Different types of molecules
All same properties except one
5. What is a Mixture?
A mixture is matter that is not uniform
throughout
It has different types of molecules and atoms
Different Properties
6. What is a Homogenous
Mixture?
Type of mixture
Looks same throughout
molecules are not uniform
Solutions are Homogenous Mixtures
Ex: salt water, air, ketchup, chicken consommé
7. What is a Heterogenous
Mixture?
Doesn’t look the same throughout
Type of Mixture
Comes from the root hetero meaning different
Ex: cookies, salsa, carpet
11. What is chemical change?
A change in a substance that changes the
composition of that substance
Flammability, reactivity, reaction with electricity
are chemical properties
Chemical properties can be found using
flammability test, reactivity tests, electrolysis
12. Flammability
How susceptible a substance is to fire
Cannot get original substance back after test
Chemical property test
13. Signs of a Chemical Change
Color change
Formation of a precipitate
Temperature change
Creation of gas
NOT A CHEMICAL CHANGE!!!