# Practice Significant Figures WS 2 Essay

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Name: ________________________ Date: _______________ Period: _____
Significant Figures Worksheet No. 2

RULE -1: If the decimal is Present: Find the first non zero on the left, then count all digits to the RIGHT If the decimal is Absent: Find the first non zero on the right, then count all digits to the LEFT
RULE-2: Every digit in scientific notation is Significant
RULE-3: Any number that is counted is an EXACT number and has UNLIMITED significant digits.

How many significant figures do the following numbers have?

1) 1234 m ____

2) 0.023 L_____

3) 890 kg_____

4) 91010 m _____
6) 0.0001 kg_____

7) 9010.0 cm_____

8) 3.4 x 104 g_____

9) 9.0 x 10-3 cm_____
11) 8120 cats_____

12) 9.010 x 10-2 g____

13) 0.00030 hL_____

14) 1020010 mg_____

5) 918.010 L_____

10) 0.00390 kL_____

15) 7.991 x 10-10 g____

Rule for Multiplication & Division = Least number of Sig Figs
Rule for Addition & Subtraction = Least number of decimal places (highest value)
Perform the following calculations and round according to the rule above.
16) 334.54 grams + 198 grams = ____________

17) 34.1 grams / 1.1 mL = __________________

18) 2.11 x 103 joules / 34 seconds = __________

19) 0.0010 meters – 0.11 m = ______________

20) 349 cm + 1.10 cm + 100 cm = ______________

21) 450 meters / 114 seconds = ________________

22) 298.01 kilograms + 34.112 kilograms = _______

23) 84 m/s x 31.221 s = ___________________

Perform the following dimensional analysis problems. Make sure the final value has the proper number of significant figures. SHOW ALL CALCULATIONS! If you need more space, use the pages of your comp book.

24) 5,680meters  ______ kilometers
25) 0.0567 kilograms  _____grams
26) 2.50 grams  _____ milligrams
27) 12.450 liters  _____ centiliters
28) 4.25 x 1023 atoms  ____ moles
29) 45.7 moles  ____ molecules
30) 0.0650 L of helium gas  ______moles

Name: ________________________ Date: _______________ Period: _____
Significant Figures Worksheet No. 2

RULE -1: If the decimal is Present: Find the first non zero on the left, then count all digits to the RIGHT If the decimal is Absent: Find the first non zero on the right, then count all digits to the LEFT
RULE-2: Every digit in scientific notation is Significant
RULE-3: Any number that is counted is an EXACT number and has UNLIMITED significant digits.

How many significant figures do the following numbers have?

1) 1234 m ____

2) 0.023 L_____

3)…