A) Multiple Choice Questions: Place your answer in the space in front of each question.

Transcription

1 Student Name: Topic 1: Covalent Bonding omework A) Multiple Choice Questions: Place your answer in the space in front of each question. 1) When two atoms of nitrogen bond, how many pairs of electrons will be shared between them? a) 1 b) 2 c) 3 d) 4 2) When two atoms of fluorine bond, how many electrons will be shared between them? a) 1 b) 2 c) 3 d) 4 3) When an atom of and an atom of F bond together: a) The will be partially positive, because it has higher electronegativity than F. b) The will be partially negative, because it has higher electronegativity than F. c) The F will be partially positive, because it has higher electronegativity than. d) The F will be partially negative, because it has higher electronegativity than. 4) Which of the molecules listed below has the most polar bond between the bonded atoms, in terms of greatest END? a) F b) Cl c) Br d) I 5) Which of the following compounds is formed by covalent bonding? a) Na 2 S b) AlCl 3 c) C 6 12 O 6 d) Li 6) Which of the following molecules contains a nonpolar covalent bond? a) 2 O b) F c) F 2 d) N 3 7) Which of the following molecules contains a polar covalent bond? a) 2 b) P 3 c) F 2 d) N 3

2 B) Identify the following bonds as being polar covalent or nonpolar covalent. For the + - ends. Bond END Polar or Nonpolar? C Cl C Cl P Cl Cl Cl P O O O ends C Cl C Cl P Cl Cl Cl P O O O + - C) Explain, in terms of electronegativity difference, why Cl 2 contains nonpolar covalent bonds. ) Explain, in terms of electronegativity difference, why 2 O contains polar covalent bonds.

3 Students Name omework # 2 A ) Complete the following chart, drawing the dot diagram of each element in the molecule and then the dot diagram of the molecule. If the formula is 2 O, make sure you have two atoms of and one of O in your dot diagram of the molecule. Formula Dot diagram for: Dot diagram for: Dot Diagram of Molecule Shape F F F 2 Br Br 2 O O N N 3 S 2 S C C 4

4 Students Name omework # 3 Molecular Substances omework A) Multiple Choice Questions: Place your answer in the space in front of each question. 1) Which of the following molecules is polar? a) F 2 b) N 3 c) O 2 d) Cl 2 2) Which of the following molecules has the strongest hydrogen-bond attractions? a) F b) Cl c) Br d) I 3) Which of the following nonpolar molecules has the highest boiling point? a) C 4 b) C 2 6 c) C 3 8 d) C ) Which of the following molecules is a liquid at STP? a) N 2 b) 2 c) Br 2 d) I 2 5) Which of the following molecules is bent? a) N 2 b) 2 O c) N 3 d) CCl 4 6) Which of the following molecules is pyramidal? a) N 2 b) 2 O c) N 3 d) CCl 4 7) Which of the following molecules is tetrahedral? a) N 2 b) 2 O c) N 3 d) CCl 4 8) Which of the following substances is molecular? a) NaCl b) CO 2 c) K 2 O d) C

5 B) For each of the following molecules represented by structural formulas indicate a) if the molecule is polar or nonpolar. b) If polar, draw the dipole moment and which side is partially positive and which side is partially negative. If nonpolar, then skip this step and move on to c). c) Identify the shape of the molecule d) identify the type of attractive force that will hold molecules of this substance together in the liquid and solid phase. Molecule (do B in this box) Polar or Nonpolar Shape IMAF Type Dot Diagram Cl O - N Cl Cl C Cl Cl O = C = O - Br

6 Name omework #4 Molecular Formulas and Naming omework A) Multiple Choice Questions: Place your answer in the space in front of each question. 1) Which of the following is an empirical formula? a) 2 O 2 b) CaCO 3 c) C 2 4 d) C 6 12 O 6 2) Which of the following is a molecular formula? a) 2 O 2 b) CaCO 3 c) C 4 d) CO 2 3) What is the empirical formula of C 4 10? a) C 4 10 b) C 2 5 c) C 5 d) C 2 4) ow many moles of oxygen atoms are there in 2 moles of C 6 12 O 6? a) 6 b) 12 c) 24 d) 48 B) Determine the molecular formulas for each question below, showing all work. 1) The empirical formula of a compound is found to be C, and the molecular mass has been determined to be 78.0 g/mole. What is the molecular formula of this compound? 2) The empirical formula of a compound is found to be O, and the molecular mass has been determined to be 34.0 g/mole. What is the molecular formula of this compound? 3) The empirical formula of a compound is found to be NO 2, and the molecular mass has been determined to be 92.0 g/mole. What is the molecular formula of this compound?

7 C) Identify each of the following as an empirical or molecular formula. If a formula is molecular, write its empirical formula. Formula Empirical or Molecular? Simplify if Molecular Formula NaCl N 2 O 4 Empirical or Molecular? Simplify if Molecular C 2 6 Ra(CN) 2 Ba(NO 3 ) 2 C 6 12 O 6 C) Fill in the blanks for each molecular compound, using the clue given for each: Formula Name (Stock System) Name (Prefix System) SO 3 2 O Cl Phosphorous (V) oxide ydrogen nitride ydrogen sulfide Phosphorous trichloride Carbon tetrabromide