11.Compared to the surface temperature and luminosity of massive stars in the
Main Sequence, the smaller stars in the
Main Sequence are
(1) hotter and less luminous
(2) hotter and more luminous
(3) cooler and less luminous
(4) cooler and more luminous

What kind of ion is contained in salts that produce an acidic solution? a positive ion that attracts a proton from water a positive ion that releases a proton to water a negative ion that attracts a proton from water a negative ion that releases a proton to water

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?

In the following redox reaction which is the oxidizing agent and which is the reducing agent? alcl3 + na nacl + al oxidizing agent = reducing agent =