Monday 9-14 and Tuesday 9-15Major Quiz and Foul Water Lab

Mrs. Wilson

Objectives

Use physical changes, specifically filtration and adsorption, to purify a sample of foul water.

Assess your knowledge of Lessons 1.3 to 1.7.

Homework: Foul Water Lab Sheet

Schedule1.Perform Part 2 (Sand Filtration) **PLEASE READ THE INSTRUCTIONS WITH THESE CHANGES

- Wash the graduated cylinder and beakers with

soap/water and brushes before starting.

- The sand/gravel cup and holes have already

been made.

- Pour your foul water through the sand/gravel

SLOWLY and catch the filtrate in a clean beaker.

- Do not dispose of the sand/gravel cup or its

contents.

- Observe your filtrate and record observations.

Measure volume. USE ONE UNCERTAIN DIGIT.

2.Perform some of Part 3 (Charcoal Adsorption) Obtain charcoal and filter paper from me. Fold your filter paper like this.

Follow the instructions for adding the charcoal. Set up your filtration like this. Pour your liquid through the funnel SLOWLY and

on the filter paper. We will do the major quiz while everyone’s

setups continue filtering.

Major Quiz Obtain a calculator and a periodic table. Work by yourself. Work silently. No questions may be asked or answered

once the quiz papers are out. Dimensional analysis, scientific notation,

and use of units are expected on the short answer.

Turn in your completed quiz into the Class In bin.

Please follow the LASA honor code.

Schedule3. Finish Part 3 (Charcoal Adsorption) **READ THE

INSTRUCTIONS

- Re-wash glassware as necessary.

- Refilter if necessary – If you followed instructions

before, your filtrate should be clear; no particles.

- Observe the properties of the purified water.

- Measure volume of your water in the graduated

cylinder. USE ONE UNCERTAIN DIGIT.

- Used charcoal goes into the labelled waste beaker.

- Re-wash glassware, disassemble the filtration

apparatus, wipe down your lab table, and

wash your hands.

Calculations: SHOW WORK/USE SIG FIG RULES AND UNITS

1. Find % “pure” water from original “foul” water sample: % pure = final volume x 100 = _______ml x 100 original volume ml

2. Find the water volume lost during purification:Original _________Final - _________

= _________ mL lost during purification 3. Find % water lost during purification: (use calculation #1 as your model and your answer from calculation #2).

0A Period Histogram Data** Send one person from your group to record your group’s percent recovery value.

Group Percent Recovery (%)

1st Period Histogram Data** Send one person from your group to record your group’s percent recovery value.

Group Percent Recovery (%)

3rd Period Histogram Data** Send one person from your group to record your group’s percent recovery value.

Group Percent Recovery (%)

5th Period Histogram Data** Send one person from your group to record your group’s percent recovery value.

Group Percent Recovery (%)

7th Period Histogram Data** Send one person from your group to record your group’s percent recovery value.

Group Percent Recovery (%)

Construct a Histogram** Use a ruler and label the axes with titles and appropriate units.

EXAMPLE ONLY

Intervals for percent recovery (ex. 40.0% - 49.9%, etc.)

The number of times that groups in the class got that percent recovery range

Use YOUR class’ data to complete the rest of the questions. Please follow the LASA honor code. Examine the rubric to see what is expected. Staple

your copy of the rubric to the back of the lab sheet. It is permissible to share data but not work. Work

on all labs are individual. Papers will be compared to see if methods, words, expressions, etc. are very similar or are identical. Copying work is not permitted at any time.

Make your work only your own… and not anyone else’s.