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You need your lab notebook!!. A note on assignments. Late homework is worth 50\%. I will not stamp the date on it. BE ORGANIZED!! Keep your notebooks in one place (on your shelf). Keep a separate notebook for each class.

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a note on assignments
A note on assignments
  • Late homework is worth 50%. I will not stamp the date on it.
  • BE ORGANIZED!! Keep your notebooks in one place (on your shelf).
  • Keep a separate notebook for each class.
  • You are in 10th grade. It is YOUR responsibility to complete assignments on time and to not lose your things.
studying
Studying
  • Flashcards
  • Self quiz
  • Quiz a friend
  • Teach a friend from memory
  • Draw and label diagrams from memory
  • Rewrite notes
  • Make up practice quiz questions
retaking a quiz
Retaking a quiz
  • Tuesday 8:10-9:00 pm
  • Thursday 7:00-8:00 pm
  • Call from desk, 2nd floor: 814
  • I will give you the higher mark
slide5
Separation of a Mixture 16 Oct. 08
  • Objectives: 1.
  • 2.
  • Techniques: 1.
  • 2.
  • Materials
    • (skip 5 lines)
  • Procedure: Observations:
  • Find the mass…
objective
Objective
  • To separate a mixture of manganese dioxide and sodium chloride.
  • To determine the percent of each obtained after the separation, and the percent error.
compounds
Compounds
  • manganese dioxide, MnO2, insoluble black powder (manganese (IV) oxide)
  • sodium chloride, NaCl, soluble white crystals
technique
Technique
  • Filtration
  • Evaporation
slide11
Desiccator

(removes water from a sample)

Stirring rod

slide12
Weighing paper

Drying oven (removes water from a sample quickly)

slide14
Alcohol burner

Ring stand/ring

procedure
Procedure
  • Find the mass of the 100 mL beaker on the electronic balance.
  • Mass 2 grams of NaCl and 1 gram of MnO2 on weighing paper, and record their initial masses. Mix them together in the beaker.
  • Add 20 mL distilled water to the NaCl and MnO2 mixture. Swirl gently to mix, until all the NaCl is dissolved.

Record a qualitative description.

How would you separate this mixture (and record the mass of each compound after separation)?

equipment
Equipment
  • Beakers(2, 100 mL), electronic balance (1), distilled water, graduated cylinder (1, 100 mL)
  • NaCl (powder, 2g), MnO2 (powder, 1 g)
homework 1
Homework 1
  • Draw a cartoon of the SIX main steps required to separate this mixture,
  • and to find out the mass of each compound collected at the end.
  • Write a sentence to describe each of the six steps, under each box of the cartoon.
  • Due: Fri.
slide19
Goals: Separate the manganese dioxide from the NaCl.
  • Find the mass of each compound after the separation, and compare it to your initial masses.
  • Calculate your percent error.
homework
Homework
  • Due Thursday (with your cartoon)
  • On a separate piece of paper:
  • Write the procedure for separating these two compounds (don’t worry about collecting the water)and calculating % obtained/%error.
  • Write a list of materials and equipment required (include how many of each).
a good procedure
A good procedure…
  • Very specific – list every detail even if you think it is obvious!
  • In the correct order
  • Give the name of each piece of equipment you use
  • Write when you will make observations or take a measurement
  • Describe how to do each calculation
slide22
If you do not turn in this assignment, you will not be allowed to participate in lab.
  • We will edit your procedures before going to lab.
  • Do your best…draw pictures if you have a hard time writing sentences.
  • Come see me for help!
slide24
Process of Separation

Mixture

Suspension

Filtration

Residue – manganese dioxide

Solution

Reacts with HCl acid, turns moist KI paper blue

Evaporation

Solute – sodium chloride

Water

Reacts with AgNO3 solution to form white precipitate

common challenges

Common Challenges

Add to your procedure to fix these problems!!

when filtering
When filtering
  • How will you keep salt water from being absorbed by your filter paper?
when evaporating
When evaporating
  • How will you know when all the water is evaporated?
slide31
When the salt looks dry, mass the dish + salt. Heat it a little longer, and mass it again. Repeat, until the difference in mass is less than 0.01 grams.
when finding final mass
When finding final mass
  • Scraping the NaCl from the evaporating dish and the MnO2 from the filter paper onto weighing paper will cause you to lose a LOT of mass. How can you avoid this?
slide33
Mass the filter paper and evaporating dish at the beginning. At the end, mass the filter paper + MnO2 and the evaporating dish + NaCl. Then, just subtract!!
calculations
Calculations
  • The procedure MUST show how to find the final mass of NaCl and MnO2.
  • Also describe how to calculate % obtained (the percent of each at the end), and % error.
homework1
Homework
  • Write a final draft of your procedure in your lab notebook (in the left column).
  • Under “Materials,” list all the pieces of equipment and compounds, including how many/how much of each.
  • Due Thursday, 30 October, in lab
  • No procedure = no lab
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