Pure water

H₂O is a (n) ?

1. The red light associated with the aurora borealis is emitted by excited oxygen atoms. This light has and energy wave that has a wavelength that measures 630.0 nm. a. What is the frequency of the light? b.

Why might an idea or hypothesis be discarded? A. If another scientist doesn't like it. B. If evidence also supports another hypothesis. C. If it is tested and the evidence does not support it. D. If a politician disagrees with it.

Which quantities have both a magnitude and direction? A. acceleration B. distance C. displacement D. mass E. velocity

What mass of salt (nacl) should you add to 1.48 l of water in an ice cream maker to make a solution that freezes at - 13.4 ∘c? assume complete dissociation of the nacl and density of 1.00 g/ml for water?

Which is not one of the eight most common elements in Earth's continental crust? silicon carbon aluminum oxygen

When does a spring tide take place? At the beginning of spring Only during the spring season Only after spring is over At any time

The highest cloud are known as

What is the mass of 4.85 X 10^22 atoms of iron (Fe) ?

If element x has 95 protons how many electrons does it have

Which of the following when dissolved in deionized water would make a good conducting solution? a) methanolb) sugarc) baking soda