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UCR / Chemistry / CHEM 001A / What is the generic valence shell configuration of the halogen element

What is the generic valence shell configuration of the halogen element

What is the generic valence shell configuration of the halogen element

Description

School: University of California Riverside
Department: Chemistry
Course: General Chemistry
Professor: Hill harman
Term: Fall 2018
Tags: General Chemistry, Chemistry, and general
Cost: 50
Name: Chem 001A, Midterm Study Guide
Description: These notes give examples of both concepts and practice problems with answers and explanations for chapters 1-3.
Uploaded: 10/16/2018
3 Pages 54 Views 2 Unlocks
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STUDY GUIDEWe also discuss several other topics like What does polar covalent bond mean?

Ch. 1

We also discuss several other topics like Define colonial society.

Conceptual QuestionsIf you want to learn more check out gea 1000

  1. Which of the following properties of a sample of pure iron are intensive? Mass, Density, Volume, Hardness

  1. Which physical process - distillation, filtration, chromatography would you use to perform each of the following separations?
  1. Removing particles of rust from drinking water
  2. Separating the different coloring agents in a sample of ink
  3. Separating volatile compounds normally found in natural gas that have dissolved in a sample of crude oil

  1. Ice cream vendors often use dry ice (solid carbon dioxide CO2) to keep their ice cream frozen. Over time, the dry ice disappears as solid CO2 turns into CO2 gas.
  1. What is the name of this change in physical state?
  2. What is the name of the reverse process in which dry ice ice is produced from CO2 gas?

Answer Key:

  1. Intensive - density, hardness extensive - mas, volume
  2. (a) filtration; (b) chromatography; (c) distillation
  3. (a) sublimation; (b) deposition

Don't forget about the age old question of rwu password reset

Practice Problems

  1. Supposed you're asked to determine whether or not a nugget could be gold based on its density. You weigh the nugget and find that it has a mass of 164 grams (g). Then you carefully add it to a graduated cylinder that contains 50.0milliliters (ml) of water. You observe that the water level in the cylinder rises to 58.5 ml. What is the density of the nugget in grams per cubic centimeter? Could it be gold?

  • First, you need to know the density of pure gold. A glance through the textbook or a search online will reveal its density to be 19.3g/cm3

Another useful thing to realize is 1ml = 1cm3Don't forget about the age old question of What is the difference between strong acid and weak acid?

Finally the nugget’s volume is equal to the volume of water it displaces: 58.5ml - 50.0 mlIf you want to learn more check out ucsd ece

Because the calculated density is close to the density of pure gold, it is very likely that it is gold.

  1. Suppose we add a penny with a mass of 2.5271g to 49 other pennies with a combined mass of 124.01g. What is the combined mass of the 50 pennies?

The reason our final answer goes from having three digits to the right of the decimal to two is because of the weak link rule. The final answer should only have as many as the value with the fewest.

  1. In 2016, US industries consumed natural gas at a rate of 22.5 billion cubic feet per day. Use the exact conversion factor, 1in = 2.54cm, to convert this rate to cubic meter of natural gas per second.

        

We need to convert ft3 per day to m3. One billion units is equal to 10^9 units. 1 foot is 12 inches. 1m = 10² cm because our initial value is cubed, we have to make sure our conversion factors are cubed as well.

        1ft3 = 12in3 = 1728in3

        1in3 = 2.54cm3 = 16.387cm3

        1m3 = 10²m3 = 10^6m3

Furthermore since one meter is a little over 3 feet. 1 cubic meter should be a bit more than 30 cubic feet. One day has 24h X 60min/h X 60s/min which is about 10^5 seconds so the calculated values become (20x10^9)/(30-10^) or 7 X 10^3

Volume:

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