1. the diameter of a carbon atom is 0.000 000 000 000 154 m. what is the number expressed in the scientific notation?

Question

a) 1.54x10^12m
b) 1.54x10^-12m
c) 1.54x10^10
d) 1.54x10^-10

2. what is the result of multiplying 2.5x10^10 by 3.5x10^-7
a) 8.75x10^-3
b) 8.75x10^17
c) 8.75x10^3
d) 8.75x10^-17

3. the closeness of a measurement to its true value is a measure of its __?
a) precision
b) accuracy
c) reproducibility
d) usefulness

4. which of the following measurements contains two significant figures?
a) 0.0004 00 L
b) 0.0004 04 L
c) 0.0000 44 L
d) 0.0004 40 L

5. in the measurement 0.503 L, which digit is the estimated digit?
a) 5
b) the 0 immediately to the left of the 3
c) 3
d) the 0 to the left of the decimal point

6. when multiplying and dividing measured quantities, the number of significant figures in the result should be equal to the number of significant figures in __.
a) all of the measurements
b) the least and most precise measurements
c) the most precise measurement
d) the least precise measurement

Answer 1

You have simply reposted your original post from below. Yes, 5 is correct but that doesn't mean the others are wrong necessarily. You need to check your post for accuracy. For example, the correct answer for 1 is not there. The correct answer for 2 is not there.