Name: ______Date: ______Period: _____
Chemistry Unit 1 test review:
1. Define the following words:
a) Accuracy
b) Precision
c) Independent variable
d) Dependent variable
e) Qualitative measurement
f) Quantitative measurement
g) Mass
h) Scientific Theory
i) Scientific Law
j) Scientific method
2. What are the basic steps to the scientific method?
3. Bailey wants to find out which frozen solid melts the fastest: soda, ice, or orange juice. She pours each of the three liquids into the empty cubes of an ice tray, and then places the ice tray in the freezer overnight. The next day, she pulls the ice tray out and sets each cube on its own plate. She then waits and watches for them to melt. When the last part of the frozen liquid melts, she records the time.
a. Identify the independent variable
b. Identify the dependent variable
c. What is a possible hypothesis for this experiment?
4. Give 3 examples of a qualitative measurement.
5. Give 3 examples of a quantitative measurement.
6. What is the difference between a scientific law and a scientific theory?
7. Describe the following measurement in terms of accuracy and precision:
a. Measured value: 5.2 mg known value = 5.0 mg
b. Measured value: 5.2 mg, 4.9 mg, 5.1 mg known value = 5.0 mg
c. Measured values: 6.61 mL, 6.99 mL, 7.25 mL
d. Measured value: 2.134 g/cm3
8. What is the SI base unit for the following measurements
a. Mass
b. Volume
c. Distance
d. Amount of a substance
9. How many significant figures are in the following numbers?
1) 400 / 2) 200.0 / 3) 0.0001 / 4) 2185) 320 / 6) 0.00530 / 7) 22 568 / 8) 4755.50
10. Write the following numbers in standard notation.
a. 3.25 x 104 c. 5.2324 x 10-2
b. 8.67 x 10-3 d. 6.2578 x 103
11. Express the Following in Scientific Notation:
a. 0.000 03 c) 55 000 000 e) 0.000 007
b. 8 000 000 d) 0.002 f) 65 000
12. Do the Following Calculations and write answers Using Scientific Notation:
a) 0.0005 x 0.002 b) 5000 000 x 6000 c) 65 000 x 0.003
e) 9 000 / 300 f) 400 / 20 000 g) 0.008 / 0.00002
13. Perform the following calculations and show your answers with the correct number of significant figures.
a. (4.0 x 103 mm) x (1.5 x 102 mm) =
b. (5.5 x 105 Km3) / (3.3 x 103Km) =
c. 596,000 mg2 ÷ 0.0023 mg =
d. 6.77 kg x 0.9 kg =
14. List the metric prefixes symbols and their meanings in powers of 10 that we have learned in class.
15. Dimensional Analysis: perform the following conversions showing ALL work with units.
a. 5.75 years = ______seconds
b. 5,890,000 seconds = ______years
c. 286 cm = ______Tm
d. 0.00586 Kg = ______ng
e. 598000 inch = ______yards
f. 4.23 x 10-4 ML = ______mL
16. Estimate the following measurements to the correct number of significant figures.
17. Estimate the following measurements to the correct number of significant figures.
18. Density Practice. Show ALL work with UNITS
a. What is the density of a piece of wood that has a mass of 25.0 grams and a volume of 29.4 cm3?
b. Apiece of wood that measures 3.0 cm by 6.0 cm by 4.0 cm has a mass of 80.0 grams.What is the density of the wood?
c. A cup of gold colored metal beads was measured to have a mass425 grams.By water displacement, the volume of the beads was calculated to be 48.0 cm3.Given the following densities,[ Gold: 19.3 g/mL, Copper:8.86 g/mL, Bronze:9.87 g/mL] identify the metal.
d. I threw a plastic ball in the pool for my dog to fetch.The mass of the ball was 125 grams.What must the volume be to have a density of 0.500 g/mL.
e. An ice cubemeasuring 5.80 cm by 5.80 cm by 5.80 cm has a density of 0.917 g/mL.What is the mass?
f. The density of aluminum is 2.70 g/mL.If the mass of a piece of aluminum is 244 grams, what is the volume of the aluminum?