Unit One Review Homework

ApchemWiki | RecentChanges | Preferences

Difference (from prior major revision) (no other diffs)

Changed: 30c30

*Write a balanced equation for the reaction between UF₆ and H₂. Assume that the empirical formula of the gas is the true formula.

*Write a balanced equation for the reaction between UF₆ and H₂O. Assume that the empirical formula of the gas is the true formula.

Answer the following question in the space provided (do not have to show work)

1. What is the symbol for micro __________ , complete the blank _______ m = _________ nm

2. What is chemical name or chemical formula for:

Potassium bisulfite ___________________

HBrO₃ ____________________

Diphosphorus hexachloride ______________

Sn(CO₃)₂ __________________

Phosphoric acid ____________________

Answer the following problems (showing all work) on a separate sheet(s) of paper. One problem per side of page.

3. A 5.325g sample of methyl benzoate, a compound used in the manufacture of perfumes, is found to contain 3.758g of carbon, 0.316g of hydrogen, and 1.251g of oxygen. What is the empirical formula of this substance?

4. A strip of zinc metal weighing 2.00g is placed in an aqueous solution containing 2.50g of silver nitrate to form silver metal and zinc nitrate.

Write the balanced chemical reaction including phases.
How many grams of silver will be formed?
If actual yield was 1.36g of the metal (Ag), what is the percent yield of silver for this reaction?

5. Water is added to 4.267 grams of UF₆. The first products are 3.730 grams of a solid containing only uranium, oxygen and fluorine. The second product is a gas that was massed at 0.9700 grams. The gas is 95.00 percent fluorine and the remainder is hydrogen.

From the data, determine the empirical formula of the gas.
What fraction of the fluorine of the original compound is in the solid and what fraction in the gas after the reaction?
What is the formula of the solid product
Write a balanced equation for the reaction between UF₆ and H₂O. Assume that the empirical formula of the gas is the true formula.

6. The Space Shuttle environmental control system handles excess CO₂ (which the astronauts breathe out - it is 4% by mass of exhaled air) by reacting it with lithium hydroxide, LiOH, pellets to form lithium caronate, Li₂CO₃ and water. If there are 7 astronauts on board the shuttle, each exhales 20.0 liters of air per minute, how long could clean air be generate if there were 2.50E4 g of of LiOH pellets available for each shuttle mission? Assume the density of air is 0.00100 g/ml.

Answers:
1. u, 1m = 1E9 nm

2. KHSO₃, Bromic acid, P₂Cl₆, Tin (IV) carbonate, H₃PO₄
3.C₄H₄O
4. 1.59g Zn , 85.5%
5. a. HF
5b. 66.88% F in gas and 33.32% F in solid
5c. UF₂O₂
5d. 1 UF₆ + 2 H₂O --> 1 UF₂O₂ + 4 HF
6. 68 hrs or 2.9 days