Science Display
Questions – Study Sheet
1. Why do we
use salt on icy patches on roads and sidewalks?
Salt lowers
the freezing point of water and causes it to melt.
2. Why is water essential to life?
It
transports essential molecules throughout the body.
3. What is dry ice made of?
It is frozen
carbon dioxide.
4. Why is dry ice an example of sublimation?
It goes from
a solid to a gas without passing through the liquid stage.
5. What is an explosive?
It is
anything that once ignited, burns extremely rapidly and produces a large amount
of hot gas.
6. What is heterochromia?
It is when
the iris of the eye is a different colour than the other eye.
7. What organ in the body controls the central
nervous system?
It is the
brain.
8. What causes thunder?
The heat of
lightning causes the surrounding air to rapidly expand and vibrate which
creates the sound of thunder.
9. What is a
chemical reaction?
A chemical
reaction is the change of a substance into a new one that has a different
chemical identity.
10. How does a rainbow work?
Raindrops
act like prisms and separate sunlight into different colours.
11. What is DNA (deoxyribonucleic acid)?
It is the
molecule that carries genetic information in living organisms.
12. What
color is a coffee bean before it is roasted?
It is green.
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