Chapter 2 Section 3 Using Scientific Measurements Flashcards
99.099g + 1.91g =
101.01g
15.15cm x 2.10cm =
31.8cm2
0.516g/ 1.0301g/cm3 =
0.501cm3
1.05 x 10-3cm / 6.135s =
1.71 x 10-4cm/s
21L - 13.8L =
7L
(1.285 x 10-2g) + (1.24 x 10-3g) + (1.879 x 10-1g) =
Hint: Convert to standard notation first
0.2020g
8.40ft x 2.688ft =
22.6ft2
1.367s - 1.34s =
0.03s
203in x 940in =
190,000in2
(6.2 x 10-19g) / (1.6726217 x 10-30g/proton)
3.7 x 1011 protons
A student experimentally determines the melting point of naphthalene to be 79.2°C. If the accepted value for the melting point of this compound is 80.3°C, what is the percent error in the experimental measurement?

Express 16,000,000,000 in scientific notation.
1.6 x 1010
Express 0.000 000 790 in scientific notation.
7.90 x 10-7
Express 12.0 in scientific notation.
1.20 x 101
Express 0.000 752 in scientific notation.
7.52 x 10-4
How many significant figures are there in the measurement 1,582m?
4
How many significant figures are there in the measurement 87,002g?
5
How many significant figures are there in the measurement 0.0090m?
2
How many significant figures are there in the measurement 70mL?
1
How many significant figures are there in the measurement 3,000.°C?
4 (The decimal point makes all the zeros trailing the 3 significant)
Five successive measurements of the mass of a sample of iron are shown below:
- 251g
- 324g
- 549g
- 004g
- 615g
If the actual mass is 7.000g, describe the accuracy and precision of these measurements.
The measurements are not accurate because they are not close to the actual mass. The measurements are not precise because they are not close to each other.
Which of the following would be the best way to report the volume of water found in the pictured graduated cylinder?
A. 6.6mL
B. 6.5mL
C. 6.60mL
D. 6.70mL

The correct answer is C. Remember the last digit of any measurement is the estimation digit. Estimate one digit beyond what is shown on the scale.
How many pain units is the patient reporting?

73 units. The scale is marked at every ten units, so estimate to the nearest ones place.
How many pain units is this patient reporting?

3.9 units. This scale is marked at every one pain unit; we can estimate to the nearest tenth of a unit.