science homework questions?

Question

1.of the following stars,which one is the brightest?
a.nova
b.sun
c.white dwarf
d.red giant

2.the fact that the position of the constellations seems to change throughtout the year is evidence that
a.earth is rotating
b.earth is revolving
c.the sun is rotating
d.the sun is revolving

3.what happens during a lunar eclipse?
a.earth shadow falls on the moon.
b.the moons shadow falls on earth.
c.earth moves out of the plane of the mon-sun orbit.
d.the moon moves out of the plane of the earth-sun orbit.

Answer 1

Actually, the correct answer to 1. would b a, nova. The correct answer for 2 would be that b, the earth is revolving (this is right instead of rotating because rotating is a daily thing while revolving is annual) and the answer to 3 is that a, the earth's shadow falls on or "eclipses" the moon.

Answer 2

1. D 2. A 3. A

Answer 3

1.) B. sun
2.) D. the sun is revolving
3.) B. the moons shadow falls on the earth

Answer 4

1. Supernova

2. Rotating

3. Moon's shadow falls on earth

Answer 5

If a answer of calcium hydrogencarbonate is boiled, the dissolved sturdy decomposes. This reaction makes the water gentle, because calcium ions come out of the answer interior the precipitate calcium carbonate. precipitate: To reason (a sturdy substance) to be separated from a answer.

Answer 6

1. a
2. b
3. a

Answer 7

a,a,d