Biodiversity
Knowledge
what are the earths four spheres?
Lithosphere
biosphere
hydrosphere
atmosphere
Name the following elements with their symbols
group 11, period 4
group 15, period 3
group 11, period 5
Copper/Cu
Phosphorus/P
Silver/Ag
What is the difference between rotation and revolution?
(referring to earth)
Rotation is turning on its axis.
revolution is the movement around the sun.
(referring to earth)
Should you use a plastic or aluminum comb to create less friction and static?
An aluminum comb.
Calculate each energy unit in the food chain, if the trophic efficiency at each level is 10%
bunchgrass, grasshopper, Spotted frog, red tailed hawk
2543. ? ? ?
Grasshopper=2543/10= 254.3
spotted frog= 254.3/10=25.43
red-tailed hawk=25.43/10=2.543
What would happen if you combined hydrogen and oxygen? What would they be called?
This isn’t chemically, but physically combined. It would be a mixture as it would have more than one particle.
What would happen if you looked at a solar eclipse with no protection?
the radiation of the sun can burn your retina and make you blind.
The current in an automobile headlight, which is connected to a 12V battery is 0.80 A. What is the resistance of the headlight?
R=V/I
R=12/0.80
R= 15 ohms
How do human activities affect the phosphorus cycle?
human activities Affect the phosphorus cycle by the use of fertilizers. Fertilizers have high amounts of phosphorus, which goes into soil, which is due to runoff, in the water.
Are halogens more reactive than noble gases? Why or why not?
Yes. This is because noble gases are non reactive as they don’t gain, share, or lose electrons.
Halogens, on the other hand, in fact are the most reactive non-metals. This is because they try their best to receive the remaining electron to fill their outer level.
Describe why tides occur.
Tides occur due to the moon. This is due to the gravitational force of the moon. The tidal force makes the earth and the water to bump on the side closer to the moon as well as farther from the moon.
When you bring a negatively charged ebonite rod near a pith ball electroscope, the pith ball moves toward the rod. Is the pith ball positively charged? Explain.
There is a possibility of it being either positive or neutral. It cant be negative as they wind attract, the would move further. Both neutral and positive would be attracted to the rod.
Explain why most of the worlds biodiversity hotspots are in the tropics.
Tropical places have more biodiversity because they have more fertile lands for new species formation.
What is bigger, an atom or a molecule? Explain.
Molecules are bigger because atoms are the building blocks of the molecule. Molecules are made when two or more atoms bond.
Why are asteroids not called planets?
Asteroids are not called planets mainly because they do not range in the size of a planet. They are to small to be called planets.
why is there a high demand for electricity between 5:00pm and 8:00pm in the winter?
there is a high demand during that time period and season because that is when it is cold and dark, so people need more light and heat.