YR1_T1_LSN4

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

Get ready:

• Your Macbook (KWIZL)

Practice quiz:

• Do the practice quiz on KWIZL
• Check another person's work, make sure you give them feedback.

Homework for today:

• Discuss the homework exercises in your groups. 
• If you cannot work it out in your group you can ask me questions. 

Answers:

• 13. a. Basic unit of length is: meters.
• b. Basic unit of volume: liters.
• c. Basic unit of mass: grams.
• 14. a. You can use a ruler to measure the length of a pencil. 
•  b. You can use a scale to measure the mass of a pebble.
•  c. You can use a clock to measure the time it takes to brush your teeth.
•  d. You can use a graduated cylinder to measure the volume of water in a glass.
• 15. a. The best unit for measuring the length of your pencil is centimeters.
•  b. The best unit to measure the height of the Eiffel tower is meters.
• c. The best unit to measure the mass of an eyelash is milligrams.
• d. The best unit to measure the volume of a cup of tea is milliliters or centiliters
• e. The best unit to measure the time it takes to boil water is minutes.
• 16. The lab safety rules are:
• Always be properly protected. This includes wearing safety glasses and a lab coat plus tying back long hair.
• Do not eat or drink anything in the lab.
• No running or fooling around.
• Follow the instructions given for the experiment. If you are in doubt about what you should do, ask your teacher or the lab technician for help.

Answers:

• 17. a. A wash bottle: A squeeze bottle filled with distilled water. It can be used to wash
•   other equipment or dispense small amounts of water. 
•  b. A pipet: Used to transfer small amounts of liquids.
•  c. Beakers: Used for holding, mixing, measuring, and pouring liquid chemicals.
•  d. Tongs: used to pick up hot containers, materials, etc.
• 18. a. Height of a mosquito: about 1 centimeter.
• b. Mass of your chair: about 10 kilograms.
• c. Volume of a trash can: about 20 liters.
• d. Area of the top of your desk: about 40 centimeters by 70 centimeters, is about 

2800 cm2

• e. Time it takes to blink: less than 1 second. 

Answers:

• 20. a. 14 ml; 18 ml; 42 ml; 90 ml.
•  b. The second one: the scale is very precise for 20 ml.
• 21. a. 19 C; 63 C; 23 C.
•  b. Snowy climate means a temperature around 0 C. Thermometer two would be
• best, as it shows temperature around 0 C. And it has a very fine scale.
• c. If hot water means a temperature around 100 C, then it would be best to use 
• thermometer 2. This thermometer goes up to 100 C.

Answers:

• 22. a. Dangers of bleach: corrosive, danger for the environment.
•  b. The safety symbols for bleach:
• 23. a. The dimensions of one shoebox equals: 20 x 30 x 15 cm = 9,000 cm3.
• The dimensions of the large box is: 80 cm x 1.5m (150 cm) x 70 cm = 80 x 150 x 70 = 840,000 cm3.
• You can stack the boxes…
• The width of the big box is 80 cm; therefore you can have 80/20 = 4 boxes wide.
• The length of the box is 1.5 m = 150 cm; therefore 150/30 = 5 boxes deep.
• The height of the boxes is 70 cm; therefore you can have 70/15 = 4 boxes tall, with some space left over at the top.
• So, overall you can fit 4 x 5 x 4 = 80 shoeboxes in the large box
• b. There will be some space left. The total size of the large box - the size that is taken up by the 80 shoeboxes = 840,000 cm3 - (80 x 9,000 cm3) = 840,000 - 720,000 = 120,000 cm3.

Homework for lesson 5:

• Study the Quizlet SCIENCE - LAB & Topic 1
• Study your notes and the lessonups of the last 4 lessons.
• Next lesson will be a quiz.
• Read 1.4 about hearing and sound.