Light
Which of these is a source of light/luminous?
-eye
-sun
-mirror
Sun
The darkness you see behind an object when a light is shining on it.
Shadow
If I mix paper clips with rice, can I take the clips out again? Is this a reversible or irreversible change?
Reversible, because you can separate the clips from the rice
An object will be brighter if you put it....
A. close to the light source
B. far from the light source
A. close to the light source
What is one object that reflects light?
A mirror
Changes that can NOT be changed back once they happen.
Irreversible change
If I take all of the ingredients for a cake and put the together and bake the cake....can I get all my ingredients back the same way as before? Is this a reversible or irreversible change?
Irreversible, because you can not get the ingredients back the same way they were before.
If the sun is hitting your face, your shadow is...
A. in front of your face
B. behind your back
B. behind your back
Name 3 TRANSPARENT objects
(list examples like window, clear bottle, etc)
The bending of light rays as they pass through water.
Refraction
Is frying an egg a reversible or irreversible change? Why?
Irreversible, because you can not get the egg back the same way it was before.
One example of irreversible change is...
Burning, cooking, or rusting
How does light travel through the air?
In a STRAIGHT line
A material that allows SOME light to pass through it.
Translucent
If I burn a candle...which part is reversible and which part is irreversible..?
reversible--burning the wax
irreversible--burning the wick
Draw a picture on the board that shows how we see things.
(picture of sun with arrow to house, and arrow from house to person)
If a put a ruler in water, what happens to the image? What does it look like?
The ruler looks broken.
The change from a liquid to a gas
evaporation
If I mix salt with water, how can I reverse this change? What do I need to do in order to separate the salt from the water?
Boil the water
What are 2 of the 3 things that speed up dissolving.
crushing, stirring, or heating