practiceexam23 - City College, Chemistry Department...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
1 City College, Chemistry Department Chemistry 10301, sections T, T2, Τ 3. Prof. T. Lazaridis Final exam, Dec 15, 2009 Last Name: _____________________________________________ First Name: _____________________________________________ SSN l ast 4 : ______________________________________________ Note: There are 16 questions in this exam (look at both sides of the sheets). Fill in your answer in the blank space provided immediately following each question. 1/2 point will be subtracted every time you report a numerical result with an incorrect number of significant figures. A Data Sheet with useful information is at the end. 1. (4) Write the molecular formula next to the names of the following compounds: Ammonia NH 3 Ethane C 2 H 6 Calcium Carbonate CaCO 3 Potassium Perchlorate KClO 4 2. (8) Balance the following chemical equations: 2 Fe 2 O 3 + 3 C 4 Fe + 3 CO 2 C 3 H 8 + 5 O 2 3 CO 2 + 4 H 2 O 2 AgNO 3 + CaCl 2 Ca(NO 3 ) 2 + 2 AgCl 2 NaHCO 3 + H 2 SO 4 Na 2 SO 4 + 2 CO 2 + 2 H 2 O
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 3. (8) Copper dissolves in dilute nitric acid according to the equation: 3 Cu (s) + 8 HNO 3 (aq) 3 Cu(NO 3 ) 2 (aq) + 2 NO (g) + 4 H 2 O How many grams of nitric acid are required to dissolve 11.45 g of Cu according to this equation? Molar masses: Cu: 63.55 g/mol HNO 3 : 1.008 + 14.01 + 3X16.00 = 63.02 g/mol 11.45 g/ 63.55 (g/mol) = 0.1802 mol Cu X 8/3 = 0.4805 mol HNO 3 X 63.02 g/mol = 30.28 g 4. (8) Chlorine dioxide has been used as a disinfectant in air-conditioning systems. It
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 07/21/2011 for the course CHEM 111 taught by Professor Sawyers during the Spring '11 term at Virginia College.

Page1 / 7

practiceexam23 - City College, Chemistry Department...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online