COWRA HIGH SCHOOLASSESSMENT TASK COVER SHEET

This sheet must be attached to the front of your Assessment Task and submitted to your class teacher on or before the due date.

Student’s Name: _________________________________________

Course: _________________________________________

Assessment Task: _________________________________________

Date Due: _______________

Date Received: _______________

Extension granted _____ days Other circumstances ~ documents attached

I certify:a) This assignment is entirely my own work and all borrowed material has been acknowledgedb) The material contained in this assignment has not previously been submitted for assessment in any

formal course of studyc) I retain in my possession a copy of this assignmentd) I understand that late assignments will be penalised unless an extension has been granted by Deputy

Principal - Curriculum

Student’s Signature: ____________________________

-------------------------------------------------------------------------------------------------------------------------------

COWRA HIGH SCHOOLAssessment Task (Student’s Copy)

Student’s Name: _________________________________________

Course: _________________________________________

Teacher: _________________________________________

Assessment Task received by: _________________________________________

Signature: _________________________________________

Date: ______________________ Time: ______________________

Please detach this if the Assessment Task has been handed in to the office and give to student to keep for their own records.

COWRA HIGH SCHOOLYear 7 Assessment Task

NAME: Water Treatment Assignment CLASS: 7 TEACHER:

COURSE: Science TASK No: 1 Unit: Mixtures

DATE DUE: 30th March 2020, Monday week 10 term 1 TIME DUE:

MARK: 43 WEIGHT: 25% PRESENTATION: Hand-in

SYLLABUS OUTCOMES: A Student:SC4-4WS identifies questions and problems that can be tested or researched and makes predictions based on scientific

knowledgeSC4-6WS follows a sequence of instructions to safely undertake a range of investigation types, collaboratively and individuallySC4-7WS processes and analyses data from a first-hand investigation and secondary sources to identify trends, patterns and

relationships, and draw conclusionsSC4-8WS selects and uses appropriate strategies, understanding and skills to produce creative and plausible solutions to

identified problemsSC4-9WS presents science ideas, findings and information to a given audience using appropriate scientific language, text types

and representationsSC4-17CW explains how scientific understanding of, and discoveries about the properties of elements, compounds and mixtures

relate to their uses in everyday life

DESCRIPTION OF TASK: In class booklet to be completed Water usage log Water filter model

MARKING CRITERIA:

See attached sheets at the end of the booklet

COWRA HIGH SCHOOLAssessment Task Submission Policy

Submission of assessment tasks by students must follow faculty guidelines. There are basically four types of assessment tasks:

1. In Class Assessment Tasks ~ these tasks are supervised by the class teacher and collected by the class teacher at the conclusion of the assessment task. It is the responsible of the student who miss in class assessment tasks to contact the Head Teacher of that faculty.

2. Formal Examinations ~ at the conclusion of any formal examination the assessment task papers are to be collected and returned to the relevant faculty teacher.

3. Major Projects / Pieces of Work ~ these items, due to their size, are usually kept in the appropriate faculty location. Major works and projects should be kept in safe locations that minimises the risk of damage. Any assessment task would be submitted directly to the teacher. A receipt for the task will be issued to students.

4. Take Home Assessment Tasks ~ these are tasks that students are required to complete by a due date. Students should follow faculty submission guidelines regarding submission of these tasks.

Guidelines for the Submission of Assessment Tasks

1. When an assessment task is issued, the information provided to students will include: a clear statement of what the task involves and what the expectations of the student are an explanation of the marking criteria / outcomes to be assessed the due date of submission an assessment task submission cover sheet ~ see attached

2. Teachers should record the names of all students issued with the assessment task on a roll/class list and have the student acknowledge receipt of the assessment task by getting them to sign next to their name.

3. Students must take their assessment task to the class teacher. They must be signed in on the class roll and keep their receipt

4. All students must keep a copy of their assessment task.

Illness and Misadventure Appeals

If a student fails to submit an assessment task by the due date and has a legitimate reason than normal illness and misadventure procedures will apply.

REQUEST FOR ASSESSMENT EXTENSION PROCEDURE

Assessment extensions will only be granted in exceptional circumstances. All requests need to be made in writing using the extension request form. In seeking an extension discuss your request with your teacher/Head Teacher at least three (3) days before the due date with work already completed.

Forms for Illness/Misadventure and Extension can be accessed on the Cowra High School Website.

Somebody’s Poisoned the WaterholeWater is one of the most important resources for humans. Most of the water we use is a mixture rather than pure water. To keep water safe for us to drink and use, it is important that we control the substances mixed into our water.

For this project you will need to complete tasks as a class, in pairs or groups of three and individually.

Part 1 is part of this booklet work about water treatment to be completed during class discussion and practical activities.

Part 2 is a water usage log to be completed individually at home.

Part 3 is a model designing and building task to be completed in pairs or groups of three with class time to complete this task. You are allowed to work on this section at home as well but should be able to complete it in the allocated class time.

Part 1: Water Treatment- to be completed in class

Introduction:

1) List three things you do or use on a daily basis that rely on water. (Marks 1)

_______________________________________________________________________________________

_______________________________________________________________________________________

_______________________________________________________________________________________

_______________________________________________________________________________________

_______________________________________________________________________________________

2) Identify the two main sources of water for households in the Cowra region. (Marks 1)

_______________________________________________________________________________________

3) Identify one possible source of contamination of water tank supplies. (Marks 0.5)

_______________________________________________________________________________________

4) Identify one possible sources of contamination of town water supplies. (Marks 0.5)

_______________________________________________________________________________________

Absorption (in class activity):

You have a sample of water contaminated with dye. Filtering alone will not remove the dye because the particles making up the dye are too small.

Add a spoonful of the activated carbon to your beaker and stir.

1) Outline the appearance of the water after you have added the activated carbon (1 Mark)

_______________________________________________________________________________________

Filter your mixture.

Draw a labelled diagram of the equipment setup for this task. (Marks2)

- Use a pencil and a ruler

2) Describe the appearance of the filtrate (1 Mark)

_______________________________________________________________________________________

3) Describe the appearance of the residue. (1 Mark)

_______________________________________________________________________________________

4) Explain what happened to the dye (2 Marks)

_______________________________________________________________________________________

_______________________________________________________________________________________

_______________________________________________________________________________________

5) List two real contaminates that can be removed from water using absorption (1 Mark)

_______________________________________________________________________________________

Distillation (completed in class):

Some contaminates cannot be filtered out or absorbed. Salt is one example of this type of contaminant.

1) Describe what your contaminated water tastes like (this is being done with food safe glassware, stick your finger into the water then lick your finger to taste it, don’t drink the water) (0.5 marks)

_______________________________________________________________________________________

Heat the water on a Bunsen burner. When you have steam coming off the water, hold a watch glass over the beaker to condense some of the steam. Use your finger to taste some of the distilled water, be careful in case it is hot.

Draw a labelled diagram of how you set up the equipment:

- Use a pencil and a ruler (2 marks)

2) Describe the taste of your distilled water (0.5 marks)

_______________________________________________________________________________________

3) Explain what happened to the salt (1 mark)

_______________________________________________________________________________________

_______________________________________________________________________________________

_______________________________________________________________________________________

_______________________________________________________________________________________

Town Water Treatment (completed in class):

Match the steps, the description and the order in which they occur (4 marks)

Step Order Description

Chlorination 1 This step does not make the water safe

but helps to improve dental hygiene

and strength teeth.

Filtration 2 Chemicals are added to the water so

that smaller solids clump together to

form larger particles.

Flocculation 3 Water is passed through beds of sand

and carbon granules to trap solids and

absorb organic chemicals.

Fluoridation 4 Chemicals are added to kill off

dangerous microbes in the water.

Part 2: Water Use Log (at home…10 marks)

For one week you need to complete a daily log for what water is used for at your house. You need to have the use, the frequency of use and the minimum quality of water that would be required.

To gain full marks for this section you need to:

- list 8 uses (4 marks) - include the frequency (2 marks) and - include the water quality needed (2 marks).

Water quality:

Drinking quality – treated for contaminants and safe to drink Clean – free from most contaminants making it safe for washing but not for drinking Grey water - relatively clean waste water from baths, sinks, washing machines, and other kitchen

appliances

Example of log:

Monday

Use Frequency of use Minimum water quality neededShower 5 times in the household CleanWatering garden 1 time Grey water

Day __________________________________

Use Frequency of use Minimum water quality needed

Day __________________________________

Use Frequency of use Minimum water quality needed

Day __________________________________

Use Frequency of use Minimum water quality needed

Day __________________________________

Use Frequency of use Minimum water quality needed

Day __________________________________

Use Frequency of use Minimum water quality needed

Day __________________________________

Use Frequency of use Minimum water quality needed

Day __________________________________

Use Frequency of use Minimum water quality needed

Part 3: Water Treatment Model- completed at home now

Select either town or tanks water for you water supply and an appropriate contaminant. Possible contaminants include:

Too much salt Over chlorination Algae Bacteria or microbe outbreak Dead animal

Design a means of treating your water supply, indicating a contaminant that you have chosen, and draw a labelled diagram of your design (2 marks)

- This design needs to be capable of treating enough drinking water for a family for one day. The water needs to be treated in an efficient manner.

Construct a model or prototype of your design.

- The model does not need to be full size but if it is not, you need to indicate the scale for how big it would be. The model does not need to work but the design it represents would need to work.

(1 mark)- The model needs to be made from available and recycled materials as this task is not expected to cost

money.

As well as this model you need to write a report in which you:

Include labelled diagram(s) or photo(s) showing all components of the model (3 marks) Identify the correct contaminant for your model (1 mark) Identify the scale of the model (state if it is to scale or what the scale is) (1 mark) Identify how the design would efficiently produce enough clean water for a family (2 marks) Identify five key features of the model, what materials these features would be made of and what

purpose they serve in the water treatment process. (5 marks) Explain how the model works (2 mark).

Marking Criteria Name: ___________________________

Total /41

Part 1

1 2 3 4Introduction questions

Correctly lists one uses of water or Correctly identifies one source of water or Identifies one source of contamination of tank water orIdentifies one source of contamination of town water

Correctly lists two uses of water Correctly identifies one sources of water Identifies one source of contamination of tank water orIdentifies one source of contamination of town water

Correctly lists three uses of water Correctly identifies two sources of water Correctly identifies one source of contamination of water tank supplies.Correctly identifies one source of contamination of town water supplies

Absorption Missing the outline andMissing the diagram orMissing the appearance of the filtrate and residueand Missing the outline for what happened to the dye and missing the contaminate that can be removed from water using absorption

Partial outline of the appearance of the water after adding carbon orDiagram missing labels, or not drawn in pencil or using a ruler Outlines the appearance of the filtrate or residuePartially outlines what happened to the dye Or lists one contaminate that can be removed from water using absorption

Correctly outlines the appearance of the water after adding carbonDiagram missing a label, or not drawn in pencil and using a ruler Accurately describes the appearance of the filtrate or residuePartially explains what happened to the dye Or Lists one contaminate that can be removed from water using absorption

Correctly outlines the appearance of the water after adding the carbonCorrectly labelled diagram drawn in pencil and using a ruler Accurately describes the appearance of the filtrate and residueFully explains what happened to the dyeLists two real contaminates that can be removed from water using absorption

Distillation Missing the description of taste of contaminated and distilled water andDiagram is missing Or missing the explanation of what happened to the salt

Missing the description of taste of contaminated water and the taste of distilled water andDiagram is missing labels and not drawn with a pencil and ruleOr missing the explanation of what happened to the salt

Missing the description of taste of contaminated water and the taste of distilled water orDiagram is missing labels or not drawn with a pencil and ruleOr missing the explanation of what happened to the salt

Description of taste of contaminated waterAccurately drawn and labelled diagram Description of the taste of distilled waterDetailed explanation of what happened to the salt

Water treatment

Task attempted with five-six mistakes

Task attempted with three-four mistakes

Task attempted with one-two mistakes

All steps in correct order with correct description

Total /15

Part 2

1 2 3 4Log book with uses

Missing up to two days

Log completed for all seven days

Two-three different uses included

Four-five different uses included

Six-seven different uses included

At least 8 different uses included

Frequency Some frequencies missing

All frequencies recorded

Water quality Up to four mistakes or missing information

All water qualities correctly identified

Total /10

Part 3

1 2 3 4 5Model design Design

missing labels or not showing efficiency

Accurately labelled diagram of your designindicating how it will be efficient

Constructing your model:Diagram/photo of model

Diagram missing all labelled or only shows limited detail of the model

Diagram or photo lacks some detail or labels

Correctly labelled diagram(s) or photo(s) clearly showing all components of the model

Model Identifies an appropriate contaminant for the chosen water supplyModel to scale or scale identifiedDesign would produce either insufficient water or not work efficiently

Design would produce enough water for a family in an efficient manner

Key features One feature identified

One feature identified including material used

Two features identified including material used and function

Three to four features identified including material used and function

Five features identified including material used and function

Presentation Partial outline of how the model would work

Explanation of how the model would work

Total /16