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

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Presentation transcript:

Monday 9-14 and Tuesday 9-15 Major 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

Schedule 1.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.

Schedule 3.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. GroupPercent Recovery (%)

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

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

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

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