Properties of Matter
Is boiling water a chemical or physical change?
Physical change - no bonds are broken or formed
Classify as an element, compound, homogenous mixture, heterogenous mixture.
Carbon Dioxide
Compound
Pure substance made up of carbon and oxygen
What is 12,873 in scientific notation?
1.2873 x 104
- Positive 4 (move "decimal" 12,873. to the left 4 places)
Copper metal is melted. Chemical or physical change?
Physical change -melting point is a physical property
Classify as an element, compound, homogenous mixture, heterogenous mixture.
Vegetable Soup
Heterogenous mixture
Visibly different phases and compositions
What is 0.07040 is scientific notation?
7.040 x 10-2
-2 because decimal moved 2 places to the right
Is a nail rusting a chemical or physical change?
Chemical change- Color changes indicate chemical change (grey to orange)
A pure substance that can be broken down into two or more simpler pure substances by chemical means is a?
Compound
How many significant figures are in 38,097?
5
- Zeros appear between other non-zero digits, so they are significant
Is the density of isopropyl alcohol a chemical or physical property?
physical
density is mass/volume: both physical properties
What is a pure substance that can not be decomposed by a chemical process?
element
0.000780 has how many significant figures?
3
Non-zero digits are always significant
Trailing zero after the decimal is significant
Which change is not a chemical change?
a) Natural gas burns in a stove
b) The liquid propane in a gas grill evaporates because the user left the valve open
c) The liquid propane in a gas grill burns in a flame
d) A bicycle frame rusts on repeated exposure to air and water
b) The liquid propane in a gas grill evaporates because the user left the valve open
- Physical State change L-> G
- It has not changed into any other substance. All changes of state are physical changes
Definition of matter?
Anything that has mass and volume
Mass: is the amount of matter present
Volume: is the amount of space something occupies
308.95
Place into scientific notation. How many significant figures does it have?
3.0895 x 102
5 significant figures
- Zero between non zero numbers is significant