Lets Do This Already Flashcards
What can we categorize matter into?
Mixtures
What is a mixture?
A system of matter that is mixed up of two or more substances
A mixture is? ____ combined
Physically
What are the two categories of mixtures? Give an example of each
Homogenous- can’t see diff. parts of mix. Ex: tap water
Heterogenous-mix looks different
Ex: slice of pizza
What is a pure substance? Give an example of one
Can’t break down, only 1 substance. Ex: aluminum foil
What are two KEY examples of a pure substance?
Element and Compounds
List the indicators of a chemical change.
- Color change
- Gas formation
- Formation of precipitation
- Heat released (Exothermic)
- Heat absorbed (Endothermic)
What is a chemical change? Example.
Something you can’t change back. Ex: burning paper, corroding, fireworks exploding, rusting, bleaching hair
What is a physical change? Give an example.
Not changing what it is made up of. Ex: breaking/ripping something, boiling water, melting, dissolving/mixing
Who came up with the idea of atoms?
Democritus
Which Greek enlightenment thinker did not believe in atoms?
Aristotle, instead be believed that matter was made up of Earth, fire, water, air, and Aether.
Who created the atomic theory?
John Doltin
Who creates the Plum Pudding model?
JJ Thompson
Who discovered the proton?
Ernest Rutherford
Who creates the Bohr model?
Niels Bohr
