Definitions
The amount of matter in an object.
Mass
D = M/V
What is the formula used to find mass?
M = D x V
What is the formula used to find volume?
V = M/D
What are the TWO (2) chemical properties we learned?
Flammability/Combustibility and Reactivity
The amount of physical space that a solid or liquid takes up.
Volume
Mass: 10 g Volume: 5 mL
Calculate Density. Include units.
D = 2 g/mL
Density: 10 g/mL Volume: 5 mL
Calculate Mass. Include units.
M = 50 g
Density: 5 g/mL Mass: 10 g
Calculate Volume. Include units.
V = 2 mL
Describe the difference between a physical and chemical change.
(hint: use the word composition)
In a physical change, composition of matter stays the same (only size/shape change).
In a chemical change, composition of matter changes because something new is formed.
How much mass is in a given volume.
Density
Mass: 4 g Volume: 8 mL
Calculate Density. Include units.
D = 0.5 g/mL
Density: 3 g/mL Volume: 9 mL
Calculate Mass. Include units.
M = 27 g
Density: 4 g/mL Mass: 6 g
Calculate Volume. Include units.
V = 1.5 mL
Miss Sucheski has copper wires that move electricity through them and light up small "fairy lights" along the perimeter of the board.
This is an example of the physical property ___________ in action.
Conductivity (of electricity)
When an object is ______ dense than water, it will float.
When it is ______ dense, it will sink.
LESS
MORE
Mass: 9.65 g Volume: 1.25 mL
Calculate Density. Include units.
D = 7.72 g/mL
Density: 1.3 g/mL Volume: 3.45 mL
Calculate Mass. Include units.
M = 4.485 g
Density: 8.93 g/mL Mass: 5.47 g
Calculate Volume. Include units.
V = 0.613 mL
A solid precipitate forms in a test tube, after you add a powder to the water.
Chemical or Physical Change?
Physical
(remember if it did not produce a flame, explode, or produce a gas, it was not chemical!)
In a _______ change, the size/shape change, but not the composition.
In a _______ change, one or more NEW substances are formed.
Physical
Chemical
Mass: 3.216 kg Volume: 0.67 L
Calculate Density. Include units.
D = 4.8 kg/L
Density: 2.5 mg/mL Volume: 27.068 mL
Calculate Mass. Include units.
Mass = 67.67 mg
Density: 27 g/L Mass: 18 g
Calculate Volume. Include units.
V = 0.667 L
You are recording observations in your notebook and noting if physical and/or chemical changes occurred.(Label as P or C):
1. The iron rusted.
2. The volume decreased.
3. The acid bubbled.
1. C
2. P
3. C