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