1.12: Problem Solving in Chemistry

Which measurement has three significant figures?

1.02×10−3g

Nitrogen has a density of 1.17×10−3g/cm3. What is the correct mass for 2,500 cm3 of nitrogen gas using significant figures?

2.9 g

An enzyme works best at 98.6°F. The equation used to describe it requires the temperature to be in K.What is the correct temperature? Use (F×0.555)+255.37=K or (K−255.37)×1.8=F.

310 K

What is the correct scientific notation for 0.000056?

5.6×10−5

Standard conditions for an experimental chemistry reaction require a temperature of 298 K. The temperature in the lab is 65°F. Which of the following must you do to meet the requirements? ([°F×0.555]+255.37=K and [K−255.37]×1.8=°F)

Increase the room temperature by 7 K