Name Date Section Instructor Team Pre-Lab Study Questions 2 1. What are the rule

Question

Name Date Section Instructor Team Pre-Lab Study Questions 2 1. What are the rules for rounding off numbers? 2. How do you determine the number of significant figures for an answer obtained by multiplica- tion or division? 3. How do you determine the number of decimal places for an answer obtained by addition or subtraction? 4. What is an equality and how is it used to write a conversion factor? 5. Write the equality and conversions factors for the relationship between miles and hours for a car traveling at 55 mi/h.

Explanation / Answer

Ans 1 :

To round up numbers in the chemistry, we have to follow some general rules.

1. Whenever to round off adigit , look at the digit just present on the right of it. If it is 1 ,2 , 3 or 4 , simply drop it.

2. If the digit on the right is 6,7, 8 or 9 , add one to the digit to be rounded off.

3. If the digit on right is 5 , then make sure that the rounded digit must be even.

For example : 3.415 and 3.425 both will rounded off as 3.42

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