Chem. Semester Exam Review (Term on Front)
Answer to the correct amount of sig figs - 0.25•100
30
How many sig figs - 0.009870
4
How many sig figs - 1000. (includes decimal point)
4
How many sig figs - 1000.0
5
Answer to the correct amount of sig figs - 23•20
500
Answer to the correct amount of sig figs - 3.00•10^8 / 5.0•10^3
6.0•10^4
Round to 3 sig figs: a) 98.473 b) 9500 c) 0.0000076321 d) 3456.5 e) 1464.9
a) 98.5 b) 9.5•10^3 c) 0.00000763 d) 3460 e) 1460
How many sig figs - 1000
1
How many sig figs - 1•10^100
1
What are the 4 clues that identify that a reaction is happening?
1. Color change l 2. Heat 3. Gas 4. Precipitate
Answer to the correct amount of sig figs - 13.7•7.333
100. (notice the decimal)
Calculate average atomic mass: Oxygen has 3 isotopes 16 17 18 O O O 8 8 8 99.7% 0.2% 0.1%
16(99.7) + 17(0.2) + 18(0.1) 16 g/mol _______________________________ 100 =16g/mol
How many sig figs - 0.015
2
How many sig figs - 9.5•10^2
2
How many sig figs - 950
2
How many sig figs - 195
3
Answer to the correct amount of sig figs - 200.0•4.5
9.0•10^2
P or C: burning wood
C
P or C: nail rusting
C
P or C: souring milk
C
P or C: Bending wire
P
P or C: H2O evaporating
P
P or C: boiling H2O
P
P or C: dissolving aspirin
P
P or C: melting ice
P
