Show:
Physical vs. Chemical Change
Element, Compound or Mixture
Volume and Density
Atomic Theory
Odds and Ends
100
Physical or chemical: crushing a can
Physical change
100
Element, compound or mixture: Nitrogen (N2)
Element
100
The volume of an object is 2.5 mL and its mass is 50 g. What is its density?
30 g/mL
100
Democritus or Dalton: first one to state that an atom was the smallest piece of matter
Democritus
100
Is made from two or more substances that are together, but not chemically combined into a new substance
A mixture
200
Physical or chemical: explosion of fireworks
Chemical change
200
Element, compound or mixture: steel
Mixture
200
If an object has a density of 2.4 g/cm3 and a volume of 150 cm3, what is its mass?
Mass: 360 g
200
What is true about all of the atoms of an element?
They are all the same
200
Why can gold be separated through physical means/ panning?
Because it is significantly more dense than the other materials
300
Physical or chemical: dissolving sugar into water
Physical change
300
Element, compound or mixture: sodium hydroxide (NaOH)
Compound
300
What is the density of a sphere that has a mass of 350 g and a radius of 4 cm?
1.31 g/cm3
300
What happens when two or more different elements combine?
They form a compound
300
What is needed to separate an element from its compound?
A chemical change/chemical reaction
400
Physical or chemical: milking turning sour
Chemical
400
Element, compound or mixture: Silicon (Si)
Element
400
What is the density of a cylinder that has a height of 3 cm, a radius of 4 cm and a mass of 750g?
4.97 g/cm3
400
What is true about the masses of elements in a compound?
They are always in a constant ratio.
400
This is a rock that contains a metal or economical useful material
Ore
500
Physical or chemical: grilling a hamburger
Chemical change
500
Element, compound or mixture: Rust/ iron oxide (FeO)
Compound
500
CP: What is the mass of a cylinder whose density is 1.5 g/cm3 and has a radius of 2 cm and a height of 5 cm? Adv: What is the radius of a sphere that has a density of 4.2 g/cm3 and a mass of 825g?
CP: 94.25g Adv: 3.61 cm
500
If 32 g of oxygen combine with 4 g of hydrogen to form water, how many grams of oxygen will combine with 6 g of hydrogen to form water?
48 g of oxygen
500
How would your mass and weight change if you traveled to the moon? Must include explanation for points.
Mass would not change because the amount of matter in your body is constant. Weight would decrease because the moon's gravity is less than Earth's resulting in less force.