Doppler shifted hydrogen absorption lines are seen in the spectrum of a star. The hydrogen line at 656.28 nm is seen to be shifted to 656.08 nm. Is the star moving towards or away from us, or can we not tell?

Does a solution have to involve a liquid? Explain your answer

the law of conversation of (mass/energy) states that the total mass before a chemical reaction is the same as the totally mass after the reaction. which is one is it mass or energy?

In what state are most nonmetals at room temperature

The elements of which group are nonreactive? halogens alkaline earth metals noble gases alkali metals

What are some cool science fair expirements?

10. In what part of the world might you find Mystery Island (note: you will be given full-credit for simply attempting this question and you will find the actual answer in your teacher's feedback). Do not answer!

What are the spectator ions in this equation?

A quantity of 1.922 g of methanol (CH3OH) was burned in a constant-volume bomb calorimeter. Consequently, the temperature rose by 5.72°C. If the heat capacity of the bomb plus water was 9.

Some studies has shown that peppermint odor increases people's mental sharpness, especially when they solve math problems.

Why can't double-replacement reactions start with one reactant is a pure metal?