B. Chemical energy to start a chemical reaction
Answer:
Is this really middle school? Im in middle school and this looks way beond what i would know, im so sorry if I am no help for this question :(
The number of significant figures within a number are the amount digits that are required to specify a number to a certain degree of accuracy. In the number, 0.0645 g, the 6 is the most significant figure and 4 is the second most significant figure. Therefore, rounding to two significant figures yields 0.064g.
