You need your lab notebook!!
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You need your lab notebook - PowerPoint PPT Presentation

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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.


  • 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

  • Separation of a Mixture 16 Oct. 08

  • Objectives: 1.

  • 2.

  • Techniques: 1.

  • 2.

  • Materials

    • (skip 5 lines)

  • Procedure: Observations:

  • Find the mass…


  • To separate a mixture of manganese dioxide and sodium chloride.

  • To determine the percent of each obtained after the separation, and the percent error.


  • manganese dioxide, MnO2, insoluble black powder (manganese (IV) oxide)

  • sodium chloride, NaCl, soluble white crystals


  • Filtration

  • Evaporation

Filter paper



(removes water from a sample)

Stirring rod

Weighing paper

Drying oven (removes water from a sample quickly)

Alcohol burner

Ring stand/ring

Procedure containers)

  • 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 containers)

  • 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 containers)

  • 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.

Homework containers)

  • 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… containers)

  • 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

Process of Separation allowed to participate in lab.




Residue – manganese dioxide


Reacts with HCl acid, turns moist KI paper blue


Solute – sodium chloride


Reacts with AgNO3 solution to form white precipitate

Common challenges

Common Challenges allowed to participate in lab.

Add to your procedure to fix these problems!!

When filtering
When filtering allowed to participate in lab.

  • How will you keep salt water from being absorbed by your filter paper?

When evaporating
When evaporating bottle before filtering.

  • How will you know when all the water is evaporated?

When finding final mass
When finding final mass little longer, and mass it again. Repeat, until the difference in mass is less than 0.01 grams.

  • 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?

Calculations At the end, mass the filter paper + MnO

  • 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.

Homework At the end, mass the filter paper + MnO

  • 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