YR1_T1_LSN7

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

Science: Lesson 7

Get Ready:

• Textbook
• Notebook
• Macbook
• Google Classroom
• Kwizl
• Lessonup

Plan for today: 

1. Check your homework. (check your homework for mistakes and discuss this with your group members.)
2. Start Topic 1.6. (Read the text, take down new notes and get instructions for upcoming lessons).
3. Microscope time. (Working in the lab to prepare a video).

Answers hw exercises:

45. Natural light sources: sun, stars, a flame, lightning, fire, firefly. Artificial light sources: lamp, LED, mobile phone screen, fireworks.

46. Light travels via light waves. This is similar to how sound travels: also with waves. The difference is that light does not need particles (or molecules) to pass on the light. But sound needs particles (or molecules) to vibrate and pass on the sound.

47. Main colors from the lowest frequency (page 43): Red - Orange - Yellow - Green - Blue - Indigo - Violet.

48. Objects that do not emit light can only be seen when it reflects light (that is emitted from a light source).

Answers hw exercises:

49. In the dark you cannot see as there is no light that can be reflected by the objects around you.

50. You can see text and photos in the book because light bounces off the book. If the page is white, all light will be reflected and the page looks like white. When there is black text, all the light is absorbed and you do see black (text). 

51. A blue backpack reflects blue light and reflects blue light.

52. a. A yellow banana in sunlight will be yellow.

 b. Green grass in blue light will be black, as no light is reflected.

 c. A white sheet of paper in red light looks red, as the red light is reflected.

Answers hw exercises:

53. A black sweater does not reflect any light, but the person in the sweater will reflect light: coloured skin, brown hair, pink nails. Also around the person, you will see colors, for instance the green color of grass or the whiute of a wall. So, you will not see the black of the sweater, but will see the difference in black and the other colors around the sweater.

54. The dots in a television screen make up the different colors. A television can only produce 3 different colors (red, blue and green), and by combinations of these you can see all the colors of the rainbow.

50. a. A sodium lamp emits yellow/orange light that is absorbed by everything that is not 

yellow. When grass is green it will be black in the yellow light. Only when grass is 

yellow can it be seen; so only at the end of the summer!

 b. LED light has white light and this white light is absorbed by the grass, and the color

of the grass can always be reflected (green or yellow). 

It makes it safer to drive with LED light, as you can see more around you.

LSN 7-1.6: Observing Microscopically 

• I know the difference between an atom, molecule or particle 
• I can explain what atoms are in a molecule based on their formula
• I can explain the process of photosynthesis and know the chemical equation
• I know the parts of the plant cell and can label them on a diagram

p. 38-42

Keywords:

• micro
• particle
• atom
• molecule
• photosynthesis
• organisms
• cell wall
• cell membrane
• vacuole
• nucleus
• cytoplasm
• chloroplast

p. 38-42

Levels

Macroscopic level is what you can see with the naked eye. For the microscopic level we need tools like a microscope.

p. 38-42

Particles vs molecules vs atoms

Particle is a general term for a small piece of matter.

An atom is the smallest particle of a substance that still has the properties of the substance.

A molecule is formed when atoms 

are bonded together to form a 

different substance.

p. 38-42

Photosynthesis

In photosynthesis the sugar that is built is called glucose. The energy that is needed for building comes from the sunlight.

We can write this 

in a chemical

equation

p. 38-42

Photosynthesis

• Nucleus: controls the cell
• Cell wall: shapes the cell
• Cell membrane: controls the contents of the cell
• Cytoplasm: inside of the cell
• Vacuole: storage bag
• Chloroplasts: photosynthesis

p. 38-42

vacuole

cell wall

cytoplasm

ribosome

cell membrane

chloroplast

Homework for next time:

• Questions 56 until 66
• Complete your video in pairs and upload it to Google classroom.
• Complete the mindmap. 
• Study for the Glossary Quiz.

p. 32-37