A person is told to take 1.25mg of vitamin D daily. How many 0.500-mg tablets should this person take?

A solution has a hydrogen ion (or hydronium ion) concentration of 1.00*10-9 M. What is the pH of the solution? 7.5 8.0 8.5 9.0

What are the properties that plastic and glass always share

TRUE or FALSE: Earth is constantly experiencing climate change

One liter of ocean water contains 35.06 g of salt. What volume of ocean water would contain 1.00 kg of salt? Express your answer in L using the correct number of significant figures. Do not enter your answer using scientific notation.

An isotope contains 56 protons, 54 electrons, and 74 neutrons. What is the identity of the isotope?

Can you think of other possible ways scientists can determine what climate was like in the past besides studying ice cores?

Which sub-layer thins out into space, where there is no air

Complete and balance the molecular equation, including phases, for the reaction of aqueous ammonium bromide, nh4br, and aqueous lead (ii) acetate, pb (c2h3o2) 2.

A magnesium atom has 2 valence electrons in its third shell. Which is a TRUE statement about what happens when it forms an ion? A. It will be an anion. B. It will have more electrons than protons. C.

What scientific discoveries led to changes in Dalton's atomic theory?