Academic Chemistry Name:
Period Date:
Chapter 2 Review Sheet
What topics will be included on the exam?
· SI units and prefixes – memorize starred items
Derived units
See volume relationships cm3, mL, L
· Metric --- metric conversions
· Metric --- English conversions (conversions will be provided)
· Temperature conversions --- memorize formulas
· Heat and specific heat calculations
q = m x Cp x ∆T
units Joules, cal, Cal, kcal, kJ
· Density calculations D = M/V
· Accuracy vs. precision
% error calculations
Average deviation calculations
· Scientific notation
· Significant figures
Calculations with significant figures
Practice Problems
Report all answers to the proper number of significant figures and include appropriate units. Answers above 1000 or below 0.001 should be converted to scientific notation.
1. What is the volume of an object that weighs 30.45 grams and has a density of 1.98 g/cm3?
2. Convert the volume found in question 1 to mL an mL.
3. If the object in question 1 is heated to 300 Kelvin and then dropped into a calorimeter filled with 50.0 mL of water at 0°C resulting in a final temperature of 54°F, what is the specific heat capacity of the object?
4. Convert the heat gained by the water in question 3 from Joules to calories and Calories.
5. An experiment was performed to find the density of the object in question 1 and the following results were obtained:
Calculate the following and express the answers to the proper # of sig figs.
a. Average experimental density
b. Average deviation of experimental density
c. % error (see theoretical value in question 1)
6. What do the calculations in question 5 a and b tell you about the data set? Are these acceptable results?
7. If the density is 1.98 g/cm3, what is the density expressed as kg/L?
8. Assume that the object in question 1 is a cube, what is the length of each side of the cube in cm?
9. Convert the length of each side of the cube into feet.
10. How many sig figs are in the following?
a. 0.03450
b. 2.78 x 10-3
c. 23000
d. 0.0909
e. 1000
11. Add the numbers in question 10 and report your answer to the appropriate number of sig figs (or decimals) and in scientific notation.
12. Multiply the number in question 10 and report your answer to the appropriate number of sig figs and in scientific notation.