YR1_T1_LSN4

• Science
• Middelbare school
• havo, vwo
• Leerjaar 1

Get ready:

• Your lab journal
• Pen or pencil

Plan for today:

• Prepare ''working in the lab'' (for the 9th hour!)
• Skills 2: Converting with the metric system

Labrules:

• Always be properly protected. This includes wearing safety glasses and lab coat plus tying back long hair.
• No open shoes and make sure legs are covered (no skirt, shorts...)
• No jewellery (watches, rings...)
• Do not eat or drink anything in the lab
• No running or fooling around --> 1 warning and you are out
• Follow the instructions given for the experiment. 
• If you are in doubt about what you should do then always ask your teacher or the lab technician for help.

Lab time:

• Grab the worksheet ''working in the lab''
• Discuss in your duo what you think you need to do
  

Introduction

When you set foot in the lab there are many different procedures and rules that need to be followed. In this lab lesson you will learn how to work accurately and safely in the lab. 

In the lab you will find 4 stations, each with a different theme: 

• measuring using a graduated cylinder, 
• determining the mass by using a scale, 
• explaining safety symbols 
• identifying lab materials

Lab journal (left page)

Before each experiment: (write this in your lab journal as homework)

• Title and date (and labpartner)
• Research question 
• Hypothesis
• Materials
• Method/procedure
• Safety

(you can find a lot of information on your worksheets) (worksheets are on classroom)

Materials

• Graduated cylinders
• Water
• Scale
• 100 ml beakers
• Sand
• Substances with various safety symbols on the label / Memory cards
• Different lab materials

Procedure:

Station 1 - measuring using a graduated cylinder

Determine the amount of water in the graduated cylinders.

Read each of the two graduated cylinders carefully.

Write in Results the exact amount of water that the cylinders contain.

In the empty cylinder, put an exact amount of 21.5 mL of water.

After you have done this, ask the teacher or TOA to check the amount of water.

Station 2 - determining the mass by using a scale

Determine how much sand is in the beaker, using the scale.

Put an empty beaker on the scale and press the TARE button to set the scale on zero.

Add the sand of each of the beakers to determine the exact amount of sand.

Write your results down in Results.

Station 3 - explaining safety symbols

Look carefully at the safety symbols on the bottles you see on the table.

Make a drawing of the symbols, with the correct name under it, in Results.

Describe what the safety symbol means and what precautions you should take when using a substance that contains this symbol.

Station 4 - identifying lab materials 

For each of the materials that you see on the table: 

Make a drawing of the material and write down the name of the material under your drawing in Results.

Describe what the material is used for in the lab.

Skills 2: Converting with the metric system

During the theory lesson you learned that the metric system is a system to measure a substance

For volume has the unit Liters (L)

Sometimes Litres are too big or too small, therefore it can be converted to something bigger or smaller.

During this experiment you are going to convert with the metric system, observe volume and use a pipet to transfer water. In groups of 6.

Learning goals

• I can convert within the metric system
• I can observe volume
• I can use a pipet 

How to convert?

Part A: Procedure for observing volume:

1. Read the volume of the substance in beaker 1 
2. Write down your observation in the table on your worksheet
3. Convert the volume (you can use the ladder shown on the worksheet as help)
4. Repeat these steps for all 5 beakers

Part B: Procedure for transferring a substance with a plastic pipet:

1. Use graduated cylinder A and B
2. Transfer water from graduate cylinder A to graduated cylinder B with a pipet.
3. Make sure there is 1cL of water in graduated cylinder B.
4. Let your teacher confirm you did it correctly 

Cylinder 1

Cylinder 2

3.

4.

5.