What is an element?
The simplest kind of matter
What is a mixture?
A physical blend of at least two substances
Define physical properties.
a property that can be observed and measured without chemical reactions.
What are the 3 states of matter?
Solid, Liquid, Gas
Do compounds or mixtures have definite composition?
Compounds always come in set compositions
What is a compound?
Two or more elements, chemically combined
What are the two different types of mixtures?
Homogeneous and Heterogeneous
Define chemical properties.
a property that can only be observed through a chemical reaction.
Order the 3 states of matter from slowest to fastest particle speed
Solid -> Liquid -> Gas
List 5 ways that you can recognize a chemical change
1) Energy change
2) Color change
3) Formation of precipitate
4) Irreversibility
5) Gas production
Give an example of a chemical compound
H2O, CO2, CH4, etc.
Define heterogeneous mixture and give an example
A mixture that is not uniform in composition
EX: Salad, Soil, Cereal
Give an example of a physical property.
color, hardness, m.p., b.p.
Describe the shape and volume of both a gas and a liquid
Gas- No definite volume or shape
Liquid - No shape, but definite volume
Molten lava pours from a volcano in Hawaii. After a few hours, the liquid lava hardens into a shiny gray rock. Which phase change has taken place?
Freezing
How many elements are there in the world?
118
Define homogeneous mixture and give an example
A composition that is uniform/same throughout
EX: Saltwater, lemonade, coffee
What is an intensive property? Give an example
A property that does not depend on the amount of matter present
EX: Density, m.p., b.p., color
"Sweat" on your gatorade bottle on a hot day is an example of what phase change? One word answer
Condensation
Heterogeneous or Homogeneous?
Heterogeneous
How many elements are naturally occurring and how many were found in a lab?
98 naturally occurring elements and 20 elements were discovered in a lab
Is this is a homogeneous or heterogeneous mixture? Explain.
Heterogeneous. The cookie is not the same throughout
What is an extensive property? Give an example
A property that depends on the amount of matter in the sample
EX: Mass, Volume, Length
What is the name of the phase change from Liquid to Gas
Evaporation
What was this guys name?
Louis Slotin