What is the correct representation of 702.0 g in scientific notation? A. 7.02 x 103g
B. 70.20 x 101 g
C. 7.020 x 102 g
D. 70.20 x 102 g
(answer fast !!)

C. 7.020 x 10^2 g

Explanation:

To convert to scientific notation, move the decimal until there is only one digit greater than 1 and less than 10 before the decimal. In this case, the 7. (Depending on the conversion, you will either move the decimal to the left or right. In this question, you will need to move it left. When you move the decimal left, you inherently think you are moving it in the negative direction, but your final answer will be a positive exponent. The opposite is true for movement in the right direction, leaving a negative exponent in your final answer.)

Then, count the number of places that you moved the decimal from the original number (in this case, you moved it 2 decimal places to the left).

Because you moved the decimal 2 places to the left (-), when you write it in scientific notation, you want to annotate the exponent as the opposite, (+), so that you do not lose the equivalence of the original number (in this case, state it as 10^2 as in choice C).  

Note: Once you do your conversion, you can plug it into your calculator and press "=" to verify that you did not change the number in doing your conversion.