What are the number of protons, neutrons and electrons in the this isotopes

89

Sr

38

What is the pH of a weak acid solution that has an [H*] of 2.1*10^6 M?

For each of the following balanced oxidation-reduction reactions, (i) identify the oxidation numbers for all the elements in the reactants and products and (ii) state the total number of electrons transferred in each reaction. 1.

What could people do in order to make nonrenewable resources last longer?

What is the approximate mass of one mole of chromium

Which has more molecules, a teaspoon of water that has a mass of 1.25 grams or a teaspoon of ethanol - C 2 H 5 OH that has a mass of 0.890 grams?

Distinguish between the structures of arteries, capillaries, and venies. what is the function of each.

Which phase of matter has a fixed volume but variable shape

Given 10.8 grams of substance Y, if the substance absorbs 231 kilojoules of energy and the specific heat of the substance is 6.55 J/g·°C, what is the change in temperature?

Which sphere includes rocks and minerals? A. atmosphere B. biosphere C. geosphere D. hydrosphere

What defines a material as being a mixture?