astronomy
chemistry
100

what is a star?

a natural luminous body.

100

are two atoms of the same element identical?

no.

200

why do stars twinkle?

due to the effects of earths atmosphere.

200

how many alcoholic drinks does it take to effect your brain?

1 drink.

300

how far is the closest star?

4.24 light-years away.

300

how is matter held together?

chemical bonds

400

what are constellations.

a grouping of stars which form a pattern in the sky.

400

is HF (hydrofluoric acid) a strong or weak acid?

weak

500

why are stars so far away.

Because if the stars were much closer earth wouldn't exist.

500

how is ionic covalent bonds form? 

when two or more ions come together.

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