Why helium is duplet?

For the reaction H2SO4 + 2Na2OH4 - > Na2SO4 + 2H2O If you want to make 5 moles of Na2SO4, how many miles of H2SO4 do you need? A) 5 B) 10 C) 12 D) 2

Explain why electrons orbit around the nucleus

Calculate the mass of two moles of kbr

What mass of hydrogen is produced when 49.0 grams of sodium reacts with 30.0 grams of water

What causes the appearance of lines in an emission spectrum? A. Light is absorbed as an electron moves to a higher energy state. B. Light is released as an electron moves to a lower energy state. C.

If a fast moving car making a loud noise approaches and moves past the person what will happen as the distance between the two increases?

Which of the following would be an example of a trophic relationship? Select all that apply. photosynthetic plankton respiring oxygen into the ocean small marine life feeding on the algae and plankton that have descended to the ocean floor a

Fumaric acid is an organic compound composed of 41.39%, 3.47%, and the rest oxygen. If 0.288 mol of fumaric acid has a mass of 33.4 g, what are the empirical and molecular fomulas of fumaric acid

What is an isotope? Give an example of an element with isotopes.

Consider the reaction between liquid water and aqueous magnesium nitride to form solid magnesium oxide and ammonia gas. If magnesium nitride is present in excess, how many moles of water are needed to form 9.17*1023 ammonia molecules?