Chemistry Study Guide

Chemistry: Study Guide * Question 1 10 out of 10 points | | | According to VSEPR theory, which one of the following molecules should have a  bent   shape? Answer| | | | | Selected Answer:|   Ã‚  Cl2O| | | | | * Question 2 10 out of 10 points | | | According to the VSEPR theory, the molecular shape of SiCl4  isAnswer| | | | | Selected Answer:|   Ã‚  tetrahedral. | | | | | * Question 3 10 out of 10 points | | | According to the VSEPR theory, the shape of the SO3  molecule isAnswer| | | | | Selected Answer:| trigonal planar. | | | | | * Question 4 10 out of 10 points | | Balance the following equation using the smallest set of whole numbers, then add together the coefficients. Don't forget to count coefficients of one. ___ Al + ___ H2SO4  > ___ Al2(SO4)3  + ___ H2 The sum of the coefficients isAnswer| | | | | Selected Answer:|   Ã‚  9. | | | | | * Question 5 10 out of 10 points | | | Consider the species Cl2+, Cl2, and Cl2?. Which of these species will be paramagnetic? Answer| | | | | Select ed Answer:|   Ã‚  Cl2+  and Cl2? | | | | | * Question 6 10 out of 10 points | | | How many O atoms are there in 51. 4 g CaSO4?Answer| | | | | Selected Answer:|   Ã‚  9. 09 ? 1023| | | | | * Question 7 10 out of 10 points | | | How many covalent bonds will a nitrogen atom usually form? Answer| | | | | Selected Answer:|   Ã‚  3| | | | | * Question 8 10 out of 10 points | | | How many grams of Cl2  can be prepared from the reaction of 16. 0 g of MnO2  and 30. 0 g of HCl according to the following chemical equation? MnO2  + 4HCl > MnCl2  + Cl2  + 2H2OAnswer| | | | | Selected Answer:|   Ã‚  13. 0G| | | | | * Question 9 10 out of 10 points | | | How many grams of sodium are there in 10. g of sodium sulfate, Na2SO4?Answer| | | | | Selected Answer:| 3. 2| | | | | * Question 10 10 out of 10 points | | | In which of the following would the bonding be  weakened  with the addition of an electron to form the negative molecular ion? Answer| | | | | Selected Answer:|   Ã‚  N2| | | | | * Question 11 0 out of 10 points | | | In which of these pairs of atoms would the bond have the  greatest  percent ionic character (i. e. , most polar)? Answer| | | | | Selected Answer:| c-o  Ã‚  s-o f–f| | | | | * Question 12 10 out of 10 points | | | Indicate the type of hybrid orbitals used by the central atom in PCl3.Answer| | | | | Selected Answer:|   Ã‚  sp3| | | | | uestion 13 10 out of 10 points | | | The F? S? F bond angles in SF6  areAnswer| | | | | Selected Answer:|   Ã‚  90 ° and 180 °. | | | | | * Question 14 10 out of 10 points | | | The Lewis dot symbol for the a lead atom isAnswer| | | | | Selected Answer:|   Ã‚  | Not A| | | | * Question 15 10 out of 10 points | | | The Lewis structure for CS2  is:Answer| | | | | Selected Answer:|   Ã‚  | | | | | * Question 16 10 out of 10 points | | | The number of pi bonds in the molecule below is Answer| | | | | Selected Answer:|   Ã‚  3| | | | | Question 17 10 out of 10 points | | | T he number of resonance structures for the nitrate ion that satisfies the octet rule isAnswer| | | | | Selected Answer:| 3| | | | | Question 18 Question 18 10 out of 10 points | | | The shape of the CS2  molecule is best described asAnswer| | | | | Selected Answer:|   Ã‚  linear. | | | | | | | | * Question 19 0 out of 10 points | | | What is the formal charge on sulfur in the best Lewis structure for the SCN? (thiocyanate) ion? Answer| | | | | Selected Answer:|   Ã‚  ? 1 +2 -2+1| | | | | * Question 20 10 out of 10 points | | What type of chemical bond holds the atoms together within a water molecule? Answer| | | | | Selected Answer:|   Ã‚  Polar covalent bond Question 2110 out of 10 points | | | When 22. 0 g NaCl and 21. 0 g H2SO4  are mixed and react according to the equation below, which is the limiting reagent? 2NaCl + H2SO4  > Na2SO4  + 2HClAnswer| | | | | Selected Answer:| | | | | | | | | | * Question 22 10 out of 10 points | | | Which of the following correctly li sts species in order of  increasing  bond length? Answer| | | | | Selected Answer:|   Ã‚  O2+  ; O2  ; O2? | | | | | * Question 23 0 out of 10 points | | | Which of these atom is the  most  electronegative? Answer| | | | | Selected Answer:|   Ã‚  P| | | | | Question 24 10 out of 10 points | | | Which of these compounds is most likely to be ionic? Answer| | | | | Selected Answer:|   Ã‚  KF| | | | | * Question 25 10 out of 10 points | | | Which of these elements is most likely to exhibit an expanded octet in its compounds? Answer| | | | | Selected Answer:| s| | | | | * Question 26 0 out of 10 points | | | Which of these ionic solids would have the largest lattice energy? Answer| | | | | Selected Answer:|   Ã‚  CaBr2NaF, NaCl| | | | * Question 27 10 out of 10 points | | | Which of these pairs of elements would be most likely to form an ionic compound? Answer| | | | | Selected Answer:|   Ã‚  Cl ; Mg| | | | | * Question 28 10 out of 10 points | | | Which of these su bstances will display an incomplete octet in its Lewis structure? Answer| | | | | NO| | | | | uestion 29 10 out of 10 points | | | Which response includes all the molecules below that do not follow the octet rule? (1) H2S  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  (2) BCl3  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  (3) PH3  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  (4) SF4Answer| | | | | Selected Answer:|   Ã‚  (2) and (4)| | | | |