Chemical and Physical Changes
Something changes in shape, but there is no new substance
What is a physical change?
NaC
What is an example of a compound?
Appearance of a mineral in reflected light.
*Not a reliable test
What is the color of a mineral?
The formula for calculating density
what is D=M/V
A new substance with different properties
What is a chemical change or chemical reaction?
number of different elements in this compound:
NaC3ONiO
4
The ability to resist being scratched
What is the hardness of a mineral?
You have a rock with a volume of 15cm3 and a mass of 45 g. What is its density?
3 g/cm3
Evidence of a chemical change
What is Color Change (City)
Gas: Bubbles, fizzing, or odor (Girls)
Light / Heat (Love)
Temperature change (Their)
Precipitate (Phones)
Contains all the elements, but NO COMPOUNDS
What is the periodic table of elements?
The color of a mineral's powder.
Tested with a streak plate
What is streak?
A shiny cube is 2 cm on each side, and weighs 40 g. you want to know if it is gold or something else. The density of gold 19.3 g/cm3. What is the cube's density? Is it gold?
the cube is NOT gold, since the density (5.0 g/cm3) is not the same as gold (19.3g/cm3).
A solid the forms when liquids mix
What is a precipitate?
Represented by a chemical formula
what is a compound?
Color
Luster
Streak
Hardness
what are the physical properties of a mineral?
A block of aluminum occupies a volume of 15.0 mL and weighs 40.5 g. What is its density?
d = 2.70 g/mL
This kind of change occurs when someone mixes ingredients to make a cake
what is a physical change?
a pure substance that cannot be seperated, or broken down, in any way?
what is an element?
a chart that shows the hardness of minerals, from the softest to the hardest
What is Moh's hardness scale?
Mercury metal is poured into a graduated cylinder that holds exactly 22.5 mL. The mercury used to fill the cylinder weighs 306.0 g. From this information, calculate the density of mercury.
13.6 g/mL