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Chemical/Physical
Density
State of Matter
States of Matter (Part 2)
Identifying Substances
100
What are 2 examples of physical properties?
Answers vary. Color, texture and shape.
100
An object has a mass of 35 grams and a volume of 7 cm3. What is the density? Show the formula and your work.
D = M/V D = 35 g/7 cm3 D= 5 g/cm3
100
What are the 3 states of matter?
Solid, liquid and gas
100
What is the name of the point where a liquid becomes a solid?
Freezing point
100
What characteristics of matter can you not use when identifying a substance?
any type of measurements
200
What are 2 examples of chemical properties?
Answers vary. Ability to burn and the ability to rust.
200
An object has a mass of 42 grams and a volume of 6 cm3. What is the density? Show the formula and your work.
D = M/V D = 42 g/6 cm3 D= 7 g/cm3
200
Explain evaporation.
Evaporation is a liquid changing to a gas.
200
What is the name of the point where a liquid changes to a gas?
Boiling Point
200
Explain how heating properties can be used to identify a substance.
Some substances heat up faster then others or can conduct heat better.
300
What is the difference between a physical and chemical property?
Physical properties can be observed without changing what the substance is made of. Chemical properties can only be observed by changing what the substance is made of.
300
An object has a mass of 24 grams and a volume of 8 cm3. What is the density? Show the formula and your work.
D = M/V D = 24 g/8 cm3 D= 3 g/cm3
300
Explain melting and freezing.
Melting is a solid changing to a liquid. Freezing is a liquid changing to a solid.
300
What is the name of the point where a solid changes to a liquid?
Melting point
300
Explain how solubility of a substance can hep identify it.
Some substances can dissolve in another substance and some cannot.
400
What are 2 examples of a physical change?
Answers vary. Tearing paper, molding clay, ice cube melting.
400
An object has a mass of 18 grams and a volume of 3 cm3. What is the density? Show the formula and your work.
D = M/V D = 18 g/3 cm3 D= 6 g/cm3
400
Explain condensation.
Condensation is when a gas changes back to a liquid.
400
How does adding energy affect a substance in a solid state?
It speeds up the molecules, melting it.
400
Explain how electric properties can be used to identify a substance.
Some substances can move or conduct electricity better.
500
Name 4 signs of a chemical change?
Bubbles produced, Change in Temperature, Odor being produced, Color change
500
A substance has a density of 10 g/cm3. What is the mass if the volume is 2 cm3? Write the formula and show your work.
M = D x V M = 10 g/cm3 x 2 cm3 M = 20 g
500
Explain sublimation.
When a solid changes directly to a gas.
500
Explain how the freezing and melting points are at the same temperature.
They both describe the same point where there is a change in matter. Water freezes and melts at 32 degrees F.
500
What are 2 ways that you can separate mixtures and what properties allow you to separate them.
Filter - things cannot dissolve Heat - some things cannot evaporate Magnet - some things are magnetic Answers vary