PLTL Unit 1 High School Chemistry Review PDF

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Unit 1 - High School Chemistry Review SELF TEST 1. Evaluate each of the following expressions. Write your answer in scientific notation and with the correct number of significant figures. a) 6.4 + 5.5 =

b) (5 x 102) x (8.0 x 103) =

2. Convert 1.86 x 105 miles per second to nanometers per week.

3. Calculate the percent by mass of sulfur in Al2(SO4)3.

4. (a) How many moles of P4O10 are there in 50.0 grams of P4O10? (b) How many grams of P4O10 are there in 0.782 moles of P4O10?

5. Balance the following chemical equation: C7H16 + O2 → H2O + CO2

Workshop 1. Evaluate each of the following and report your answer with the correct significant figures. a) 8.1252 x 104 + 6.5 x 102 =

b) (0.0020815)/(15.58 – 13.78) =

2. A 33.17-g sample of a solid is placed in a flask. A liquid, in which the solid is insoluble, is added to the flask. The total volume of the solid and the liquid is 50.00 cm3. The total mass is 59.58 g (excluding the flask). The density of the liquid is 0.864 g/mL. What is the density of the solid in g/cm3? In lb/pm3?

3. The element that is in Period 4 and Group IIA of the periodic table forms a compound with the element that is in Period 3 and Group VIA. What is the formula of the compound?

If a sample of the pure compound mentioned above contains 60.5 grams of the second element, how many moles of the first element does the sample contain? How many atoms of the first element does the sample contain?

4. (a) Balance the following equation: XO3 + BrZ3 → XZ4 + Br2 + O2

(b) How many moles of O2 will form if 3.76 moles of BrZ3 react with excess amount of XO3, assuming the reaction goes to completion.

(c) In another experiment, if 80 XO3 molecules react with 104 BrZ3 molecules, how many Br2 molecules will be produced? Which reactant will be used up in the reaction? Which reactant will be in excess? How many molecules of the excess reactant remain after the reaction is complete?

(d) If in a reaction, 3 moles of BrZ3 generate 425.7 kJ of heat, how much heat would 500.0 grams of BrZ3 generate in the same reaction? (The molar mass of BrZ3 is 126.9 g/mol.)

Post-Workshop Exercises Please complete the Post-Workshop Exercises in Units 1A and 1B in your PLTL Workbook. Also, complete the Self Test for Unit 2 in the Workbook before attending recitation next week. Starting next week, you must bring your PLTL Workbook to your recitation (aka PLTL workshops)....