Unit 1 Scientist’s Tools Practice Test
Section 1.1-1.2 Differentiate between qualitative & quantitative observations; Apply accuracy & precision in making quality measurements
Student’s Measurements (g)Trial / George / Jane / Judy / Elroy
1 / 140.0 / 136.2 / 141.1 / 143.1
2 / 145.2 / 152.9 / 141.8 / 148.3
3 / 148.1 / 158.7 / 141.6 / 139.3
4 / 139.1 / 129.9 / 141.3 / 142.6
Average / 143.1 / 144.4 / 141.5 / 143.3
Note: The accepted value for this measurement is 143.1g
1. Define precision. Whose data is more precise, George or Judy? Explain, being sure to include the definition of precision in your answer.
2. Define accuracy. Whose data is more accurate, Jane or Elroy? Explain, being sure to include the definition of accuracy in your answer.
Plant / Location / Water / HealthPlant 1 / Sunny / Normal / Good
Plant 2 / Shady / Normal / Poor
Plant 3 / Partial Sun / Normal / Excellent
3. Circle the answer. What kind of data is in the data table above?
Qualitative or Quantitative
3. Calculate the percent error of Jane’s average measurement. You
must show work for credit!
4. Read the volume of the graduated cylinder to the right.
Be certain your reading is both accurate & precise.
______ml
5. Read the length off the ruler to the
right.Be certain your reading is both
accurate & precise.
______cm
Section 1.2 Determine the number of significant figures in a measurement and make calculations involving significant figures
Directions: Determine the number of significant figures in the following measurements.
1) 0.012070 ______2) 32,500 ______3) 100. ______
Directions: Round the following measurements to 3 significant figures.
4) 153,461 ______5) 0.58 ______6) 9.171718 ______
Directions: Perform the following calculations & express your answer in the correct number of significant figures. Be sure to follow the rules discussed in class.
7) 15 + 121 + 3.14159 = ______
8) 177.18 – 12.211 = ______
9) 2.54/8.314 = ______
10) (1.00 x 680) ÷ 34.0 = ______
Section 1.3-1.4: Identify the relationship between metric units & use the dimensional analysis method to convert between units. Express answers in scientific notation.
Directions: State whether the following relationships are TRUE (T) or FALSE (F):
___ 1. 1 ms 1000 µs ___ 2. 1 Mg = 1 x1012 mg ___ 3. 18 cg = .18 g
Directions: Fill in the missing values below:
4. 28 g = ______kg 5. 0.000154 kJ = ______mJ 6. 2.67 µL = ______mL
Directions: Express your answers in standard scientific notation or ordinary expanded notation:
7. 1.28 x104 ______8. 328 ______9. 4.1 x 10-4 ______
Directions: Use dimensional analysis (factor-label method) to convert the following. SHOW ALL WORK AND INCLUDE UNITS & CORRECT SIG FIGS in your answer.
10. Convert 334 g into ounces (given that 1 ounce = 28.35g)
11. Convert 928 pL into µL.
12. Convert 2.22x10-7 dm into nm.
13. Convert 56 inches(in) into m. (1 inch = 2.54 cm)
Unit 1 Scientist’s Tools Practice Test KEY
Section 1.1-1.2 Differentiate between qualitative & quantitative observations; Apply accuracy & precision in making quality measurements
Student’s Measurements (g)Trial / George / Jane / Judy / Elroy
1 / 140.0 / 136.2 / 141.1 / 143.1
2 / 145.2 / 152.9 / 141.8 / 148.3
3 / 148.1 / 158.7 / 141.6 / 139.3
4 / 139.1 / 129.9 / 141.3 / 142.6
Average / 143.1 / 144.4 / 141.5 / 143.3
Note: The accepted value for this measurement is 143.1g
1. Define precision. Whose data is more precise, George or Judy? Explain, being sure to include the definition of precision in your answer.
Judy was more precise as her data range is only 0.7 g. Precision is how close the data are to each other.
2. Define accuracy. Whose data is more accurate, Jane or Elroy? Explain, being sure to include the definition of accuracy in your answer.
Elroy was more accurate as the average of his data, 143.3 g, is closer to the accepted value of 143.1 g (by comparison Jane’s average data average of 144.4g is further from 143.1g). Accuracy involves having the average data close to the accepted value while having at least a reasonable level of precision.
Plant / Location / Water / HealthPlant 1 / Sunny / Normal / Good
Plant 2 / Shady / Normal / Poor
Plant 3 / Partial Sun / Normal / Excellent
3. Circle the answer. What kind of data is in the data table above?
Qualitative or Quantitative
This is qualitative data because it involves characteristics/descriptions, not numbers
3. Calculate the percent error of Jane’s average measurement. You
must show work for credit! (Minimum work required for credit is in black. Work in red is optional)
%E= Accepted value-expeirmental valueaccepted value*100
%E= 143.1g-144.4g143.1g *100
%E= 143.1g-144.4g143.1g *100
%E= -1.3g143.1g *100
%E= -0.0090845563*100
%E= 0.0090845563*100
%E= 0.90845563%
%E= 0.91%
4. Read the volume of the graduated cylinder to the right.
Be certain your reading is both accurate & precise.
__67.5 ______ml
5. Read the length off the ruler to the
right.Be certain your reading is both
accurate & precise.
___1.00______cm
Section 1.2 Determine the number of significant figures in a measurement and make calculations involving significant figures
Directions: Determine the number of significant figures in the following measurements.
1) 0.012070 ___5_____ 2) 32,500 ____3______3) 100. _____3______
Directions: Round the following measurements to 3 significant figures.
4) 153,461 __153,000__ 5) 0.58 ____0.580_____ 6) 9.171718 ___9.17______
Directions: Perform the following calculations & express your answer in the correct number of significant figures. Be sure to follow the rules discussed in class.
7) 15 + 121 + 3.14159 = ___140______
8) 177.18 – 12.211 = ______164.97______
9) 2.54/8.314 = ______0.306______
10) (1.00 x 680) ÷ 34.0 = ______20.______
(note the decimal point after the zero MUST be actually WRITTEN, not just implied. 20 is an incorrect answer)
Section 1.3-1.4: Identify the relationship between metric units & use the dimensional analysis method to convert between units. Express answers in scientific notation.
Directions: State whether the following relationships are TRUE (T) or FALSE (F):
_F__ 1. 1 ms 1000 µs _F__ 2. 1 Mg = 1 x1012 mg _T__ 3. 18 cg = .18 g
Directions: Fill in the missing values below:
4. 28 g = ___0.028__ kg 5. 0.000154 kJ = __154__ mJ 6. 2.67 µL = __0.00267_ mL
Directions: Express your answers in standard scientific notation or ordinary expanded notation:
7. 1.28 x104 ___12,800______8. 328 _____3.28x102 _____ 9. 4.1 x 10-4 ____0.00041____
Directions: Use dimensional analysis (factor-label method) to convert the following. SHOW ALL WORK AND INCLUDE UNITS & CORRECT SIG FIGS in your answer.
10. Convert 334 g into ounces (given that 1 ounce = 28.35g)
334 g*1 oz28.35 g=11.8 oz
Please note that answers of 12 oz or 11.78 oz (or 11.78130511 oz) will have points taken off due to incorrect significant figures. 11.7 oz will have points taken off for incorrect rounding. Failure to include units with every number will result in points being deducted. A similar point scheme will be used for all conversion questions.
11. Convert 928 pL into µL.
928 pL*1 µL106pL=0.000928 µL
This answer may more conveniently be written in scientific notation (but this is not required): 9.28*10-4 µL
12. Convert 2.22x10-7 dm into nm.
2.22*10-7dm*108nm1 dm=22.2 nm
13. Convert 56 inches(in) into m. (1 inch = 2.54 cm)
56 in*2.54 cm1 in*1 m100 cm =1.4 m