Cette leçon contient 12 diapositives, avec diapositives de texte.
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Slide 1 - Diapositive
Practice quiz:
Do the practice quiz on KWIZL
Check another person's work, make sure you give them feedback.
timer
20:00
Slide 2 - Diapositive
Homework for today:
Discuss the homework exercises in your groups.
If you cannot work it out in your group you can ask me questions.
timer
10:00
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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.
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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.
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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.
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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.
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Homework for lesson 5:
Study the Quizlet SCIENCE - LAB & Topic 1
Study your notes and the lessonups of the last 4 lessons.