Experimental design

• Chemistry
• Secondary Education
• Age 12,13

IGCSE Chemistry 0620

1.1 - Experimental design

16 August 2023

Describe how you feel right now.

😒🙁😐🙂😃

We are learning to:

• name appropriate apparatus for the measurement of time, temperature, mass and volume, including:

(a) stopwatches

(b) thermometers

(c) balances

(d) burettes

(e) volumetric pipettes

(f) measuring cylinders

(g) gas syringes

We are learning to:

• suggest advantages and disadvantages of experimental methods and apparatus
• P1 - use equipment and materials accurately and safely
• P2 - develop observational and problem-solving skills
• P5 - transfer the experimental skills acquired to unfamiliar contexts
• P7 - develop an interest and enjoyment in science

IGCSE Chemistry 0620

1.1 - Experimental design

16 August 2023

Activity 1- Element Quiz 01

Instructions:

• Ten symbols of elements will be shown.
• Name these ten elements.
• Quizizz will be used for this activity. 
• Marks will be based on the number of correctly-named elements.

IGCSE Chemistry 0620

1.1 - Experimental design

16 August 2023

Activity 2- Reading Assignment

Instructions:

• You should have done your reading beforehand on page 405 of your coursebook, "Safe Drinking Water For All".
• In Moodle, answer the given questions with your study pair. Both of you must type your replies.
• Please feel free to comment on others' responses as well.

Expected Responses

Portable distillation units

• Strengths: Provide access to distilled water in remote areas without need for large/expensive equipment/ May be powered by renewable sources. 
• Weaknesses: If using solar power, the unit will only operate under certain conditions / Produce limited amounts of clean water / May be limited access to replacement parts if there is a failure / Would need to be very robust if used in the field / May require training in safe use / Could be expensive.

Expected Responses

Desalination units

• Strengths: Provide access to drinking water in areas with access to seawater but limited freshwater / Can be run continuously / Proven technology. 
• Weaknesses: May be limited access to parts if there is a failure / The waste product can be toxic to marine and coastal ecosystems / Energy intensive as require high temperature and pressure / Require training / Could be expensive.
  

Would you drink untreated river water using one of these straws?

YES

NO

Expected Responses

Filter Straw: Yes or No?

• The filter straw needs to remove particles of sand/silt / mud and harmful microbes such as bacteria that can cause disease.

IGCSE Chemistry 0620

1.1 - Experimental design

16 August 2023

Scientific Method

Planning an 

investigation

Activity 3- Experimental investigation analysis

Instructions:

• Read the given copy of a sample investigation.
• Highlight and label in the copy the: 

- Problem or Investigation question

- Notes or relevant information from sources

- Experimental plan to test the hypothesis/idea

- Variables: Independent, Dependent, Controlled, Uncontrolled

- Apparatus and chemicals needed/ used

- Method of experiment

- Data and analysis

- Safety and Risk reduction Procedures

- Conclusion

IGCSE Chemistry 0620

1.1 - Experimental design

16 August 2023

Points to Remember in Designing an Investigation

• correct choice of apparatus and which equipment to use and write a method explaining how to use it
• consider the level of accuracy
• consider how to control variables
• identify sources of error
• precautionary measures to minimise safety concerns

IGCSE Chemistry 0620

1.1 - Experimental design

16 August 2023

Activity 4- Laboratory Apparatus and Equipment

Instructions:

• Fifteen pictures will be shown.
• Name the apparatus/ equipment correctly.
• Blooket will be used for this activity. 
• Marks will be based on the number of correctly-named lab materials.

Selecting the correct apparatus

• Time
• Temperature
• Mass
• Volume-liquids
• Volume-gases

For Volumes of Liquids

• For approximate volumes where high accuracy is not an essential factor, measuring(or graduated) cylinders are used.
• Volumetric pipettes are the most accurate way of measuring a fixed volume ofliquid, usually 10 cm³ or 25 cm³. 
• Burettes are the most accurate way of measuring a variable volume of liquid between 0 cm³ and 50 cm³ (e.g. in a titration).

For Volumes of Liquids

For Volumes of Gases

• The volume of gas sometimes needs to be measured and is done by collecting it in a graduated measuring apparatus.
• A gas syringe is usually the apparatus used.

IGCSE Chemistry 0620

1.1 - Experimental design

16 August 2023

Now, you learned to:

• name appropriate apparatus for the measurement of time, temperature, mass and volume, including:

(a) stopwatches

(b) thermometers

(c) balances

(d) burettes

(e) volumetric pipettes

(f) measuring cylinders

(g) gas syringes

Now, you learned to:

• suggest advantages and disadvantages of experimental methods and apparatus
• P1 - use equipment and materials accurately and safely
• P2 - develop observational and problem-solving skills
• P5 - transfer the experimental skills acquired to unfamiliar contexts
• P7 - develop an interest and enjoyment in science