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CHEM 151 Exam 5 with complete solutions, Exams of Chemistry

Rio Salado CollegeChemistry

CHEM 151 Exam 5 with complete solutions

Typology: Exams

2024/2025

Available from 07/02/2025

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CHEM |! 151 |! Exam |! 5 |! with |! complete |! solutions
1. What |! are |! the |! three |! states |! of |!
matter?: |! solids |! liquids
gasses
2. What |! is |! the |! main |! diffrence |! between |! the |! states |! of |! matter?: |! the |!
distance |! of |! the |! particles |! (close |! in |! liquids |! and |! solids, |! far |! in |! gasses)
3. What |! are |! intramolecular |! forces?: |! forces |! that |! hold |! the |! atoms |!
together
4. What |! are |! intermolecular |! forces?: |! forces |! between |! two |! or |! more |!
molecules |! or |! atoms
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Download CHEM 151 Exam 5 with complete solutions and more Exams Chemistry in PDF only on Docsity!

1 |! / |! 18

CHEM |! 151 |! Exam |! 5 |! with |! complete |! solutions

  1. What |! are |! the |! three |! states |! of |! matter?:|! solids |! liquids gasses
  2. What |! is |! the |! main |! diffrence |! between |! the |! states |! of |! matter?:|! the |! distance |! of |! the |! particles |! (close |! in |! liquids |! and |! solids, |! far |! in |! gasses)
  3. What |! are |! intramolecular |! forces?: |! forces |! that |! hold |! the |! atoms |! together
  4. What |! are |! intermolecular |! forces?: |! forces |! between |! two |! or |! more |! molecules |! or |! atoms

2 |! / |! 18

  1. How |! are |! intramolecular |! bonds |! drawn?: |! as |! solid |! lines
  2. How |! are |! intermolecular |! bonds |! drawn?: |! as |! dashed |! lines
  3. Intermolecular |! forces |! are |! than |! intramolecular |! forces: |! weaker
  4. The |! stronger |! the |! attractive |! forces, |! the |! the |! temperature |! at |! which |! a |! liquid |! boils: |! higher
  5. What |! are |! the |! three |! types |! of |! intermolecular |! forces?: |! dipole-dipole |! london |! dispersion |! forces hydrogen |! bonding
  6. Where |! are |! dipole-dipole |! forces |! present?: |! polar |! molecules
  7. Where|! are|! london|! dispersion|! forces|! present?: |! nonpolar|!

4 |! / |! 18

  1. What |! is |! viscosity?: |! the |! resistance |! of |! a |! liquid |! to |! flow
  2. Stronger |! intermolecular |! attractions |! = |! ?:|! larger |! viscosity
  3. Larger |! molar |! mass |! = |! ?:|! larger |! viscosity
  4. Higher |! temperature |! = |! ?:|! lower |! viscosity
  5. What |! is |! suface |! tension?: |! the |! enegry |! required |! to |! increase |! the |! surface |! area |! of |! a |! liquid |! by |! a |! unit |! amount
  6. What |! is |! capillary |! action?: |! the |! spontaneous |! rising |! of |! a |! liquid |! up |! a |! narrow |! tube
  7. What |! are |! coheisive |! forces?: |! attract |! molecules |! together
  8. What |! are |! adheisive |! forces?: |! attract |! molecules |! to |! the |! edge |! of |! a |! surface

5 |! / |! 18

  1. What |! is |! a |! meniscus?: |! the |! curved |! surface |! on |! a |! liquid
  2. What |! are |! phase |! changes?: |! trabsformations |! from |! one |! phase |! to |! another
  3. What |! are |! endothermic |! phase |! changes?: |! melting, |! vaporization |! or |! sublination

7 |! / |! 18

  1. What |! happens |! to |! a |! heat |! curve |! during |! phase |! changes?: |! the |! temperature |! remains |! constant
  2. What |! is |! the |! vapor |! pressure?: |! the|! pressure|! of|! a|! gas|! above|! a|! liquid, |! in|! a|! sealed |! container |! at |! equilibrium
  3. Increasing |! temperature |! vapor |! pressure: |! increases
  4. Increasing |! intermolecular |! forces |! vapor |! pressure: |! decreases
  5. increasing |! the|! molar|! mass|! of|! a|! liquid|! vapor|! pressure: |! decreases
  6. The |! volume |! of |! liquid |! has |! effect |! on |! vapor |! pressure:|! no
  7. The |! surface |! area |! of |! liquid |! has |! effect |! on |! vapor |! pressure: |! no

8 |! / |! 18

  1. What |! is |! the |! boiling |! point |! of |! a |! liquid?: |! the |! temperature |! at |! whoch |! the |! vapor |! pressure |! of |! the |! liquid
  2. What|! is|! the|! normal|! boiling |! point?:|! The|! temperatre|! at|! which|! the|! vapor|! pressure = |! 1 |! atm
  3. The |! stronger |! the |! intermolecular |! forces |! within |! the |! liquid, |! the |! the |! boiling |! point |! of |! that |! liquid?: |! higher
  4. What |! is |! a|! triple |! point?: |! the|! pressure|! and|! temperature|! at|! which|! all|! three|! phases |! og |! a |! substance |! are |! in |! equilibrium
  5. What |! is |! the |! normal |! melting |! point?: |! the |! temperature |! at |! which |! the |! solid |! and |! liquid |! are |! at |! equilibrium

10 |! / |! 18 critical |! temp

  1. Solids |! can |! be |! either....: |! amorphous |! or |! crystalline |! solids
  2. What |! is |! an |! amorphous |! solid?: |! solids |! that |! have |! no |! ordered |! structure
  3. What |! are |! crystalline |! solids?: |! highly |! ordered |! molecules
  4. What |! is |! a |! unit |! cell?: |! the |! smallest |! repeating |! structure |! of |! a |! crystalline |! solid

11 |! / |! 18

  1. What |! is |! a |! crystal |! lattice?: |! a |! three-dimentional |! array |! of |! points
  2. Simple |! cubic: |! lattuce |! points |! at |! the |! corners |! 8
  3. Body-centered |! cubic: |! lattuce |! points |! at |! corbers |! and |! one |! in |! cneter |! 9
  4. Face-centered |! cubic: |! lattace |! points |! at |! each |! face, |! as |! well |! as |! at |! each |! corner |! 14
  5. How |! do |! you |! calculate |! simple |! cuboidal |! cells?: |! 1/8 |! x |! n
  6. How |! do |! you |! calculate |! body-centered |! cubic |! cells?: |! 1/8 |! x |! n |! + |! 1
  7. How |! do |! you |! calculate |! face |! centered |! cubic |! cells?: |! 1/8 |! x |! n |! + |! 1/2 |! x |!

13 |! / |! 18

immiscible

  1. What |! are |! the |! 3 |! factors |! that |! affect |! solubility?: |! structure, |! pressure, |! and |! tem- |! perature |! effects
  2. What |! is |! the |! chemist's |! rule |! of |! thumb?: |! like |! dissolves |! like
  3. The |! solubility |! of |! solids |! and |! liquids |! does |! change |! with |! pressure:|! not
  4. What |! is |! Henry's |! Law?: |! increase |! in |! pressure |! causes |! an |! increase |! in |! solubility
  5. What |! is |! the |! formula |! for |! Henry's |! Law?: |! s1/p1 |! = |! s2/p
  6. For |! a |! solid |! solute, |! increasing |! the |! temperature....: |! increases |! the |!

14 |! / |! 18 solubility |! of |! the |! solute

  1. For|! a|! gaseous|! solute,|! increasing |! the|! temperature....... decreases|! the|! solubility of |! the |! solute
  2. What |! does |! concentration |! mean?: |! the |! amount |! of |! solute |! in |! a |! given |! amount |! of |! solution
  3. Mass |! percent: |! (mass |! of |! solute/mass |! of |! solution) |! x |! 100
  4. Parts |! Per |! Million: |! (mass |! of |! solute/mass |! of |! solution) |! x |! 10^
  5. Parts |! Per |! Billion: |! (mass |! of |! solute/mass |! of |! solution) |! x |! 10^
  6. Mole |! fraction: |! ratio |! of |! the |! moles |! of |! one |! component |! to |! the |! total |! moles |! of |! all |! the |! components |! of |! the |! solution

16 |! / |! 18

  1. Colligative |! properties: |! properties |! of |! a |! solution |! that |! are |! determined |! by |! the |! type |! of |! solute |! and |! how |! much |! of |! that |! solute |! is |! dissolved
  2. 4 |! colligative |! properities: |! decrease |! in |! vapor |! pressure |! boiling |! point |! evaulation freezing|! point|! depression |! osmotic |! pressure
  3. The |! vapor |! pressure |! of |! a |! solution |! is....: |! lower |! than |! that |! of |! the |! pure |! solvant

17 |! / |! 18

  1. Raoult's |! Law: |! Psoln |! = |! (Xsolvant)(P*solvent)
  2. The |! boiling |! point |! of |! a |! solution |! is....: |! always |! higher |! than |! the |! boiling |! point |! of |! a |! pure |! solvent
  3. Boiling|! Point|! Elevation |! formula:|! ”T b |! =|! (Kb)(m)(i)
  4. The |! freezing |! point |! of |! a |! solution |! is....: |! always |! lower |! than |! the |! freezing |! point |! of |! a |! pure |! solvent
  5. Freezing |! Point |! Depression |! Formula:|! ”T f |! = |! (Kf)(m)(i)
  6. van't |! Hoff |! factor: |! total |! number |! of |! of |! particles |! in |! solution
  • Ex:|! glucose |! is |! 1
  • Ex:|! NaCl |! is |! 2 |! (breaks |! up |! into |! 2 |! ions)
  1. Osmosis: |! the |! flow |! of |! solvent |! through |! a |! semi-permeable |!