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Science 5 Midterm exam review
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A mixture contains A & B (see the table). How do we separate A & B?
Use a magnet
What process will you use to separate salt from a salt-water solution?
evaporation
Flour is added to water as shown in the picture. Is this a mixture or a solution?
Mixture - flour does not mix evenly! Only found at one part
This unknown material is a ________ object (transparent/translucent/opaque)
opaque
Based on the light intensity data, which letter (A,B,C,D) represents the light intensity for a night when the moon is full?
A
Distillation is the process of getting clean water by evaporation and condensation. In which part (A/B) can we get clean water?
Part B
Arnold thinks he can make the laser hit the detector by using the mirror maze. He draws light rays to prove it. Are his drawings correct?
The reflected ray in the mirror at the lower right has a wrong angle!
Del thinks she can see Allan in the mirror so she draws light rays to prove it. Is this true? Why/Why not?
Not true! The incident and reflected angles of the rays that Del drew are not the same!
Who can Allan see in the mirror?
Only Ellie
Are clouds opaque, translucent or transparent?
Clouds can be opaque, translucent and transparent. It depends on the amount of water vapour/ droplets they have.
The angle of incidence is denoted by angle ___________________.
Angle B
Stained glass is an example of a/an ________ object (transparent/translucent/opaque)
translucent
How many degrees is the angle of reflection in this diagram?
40 degrees!
Which of the following diagrams are incorrect?
Diagrams 1 & 6 are incorrect. Angles are not equal
Are the light rays' directions correct in the diagram? Why or why not?
Not correct. The light ray arrow should be from the source to the object, then object to the eyes
Light from a light source ___________ an object so that we can see the object (Blocks / Reflects off / Shines on)?
Reflects
Name all luminous objects: firefly; sun; moon; glass; torch; mirror
Firefly; sun; torch
Name at least 2 separating mixture method to make clean water out of this:
Hand picking; filtration; evaporation; condensation; distillation
Which can be separated through sieving? (Oil & water; Flour & rice grains; Fine salt from sand)
Flour & rice
Which can be separated through magnetism? (Gold from rice; Iron from sulfur; dust from air)
Iron from sulfur
Which separating mixture method is shown below?
Filtration
Which separating mixture method is shown below?
Decantation
Why is a chocolate bar is considered a solution?
The components are difficult to distinguish from one another; the properties are the same for any part of the chocolate bar
Cooking oil and water is an example of a (mixture/solution)?
Mixture
A conglomerate rock is an example of a (mixture/solution)
Mixture


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