How are elements and compounds different?

What is the ionic composition and osmolarity of "physiological saline" - the intravenous fluid drip you receive at a hospital?

How is chemical energy useful? Give three examples.

What best explains how two oxygen atoms, each with six valence electrons, can bond with each other? One atom can lose two electrons so that the other atom can gain them and have eight valence electrons.

How much heat is required to convert 422 g of liquid h2o at 23.5 °c into steam at 150 °c?

The Haber process produces ammonia commercially. It is represented by the equation N2 (g) 3H2 (g) - -> 2NH3 (g) To completely convert 9.0 mol hydrogen gas to ammonia gas, how many moles of nitrogen are required

What kind of reaction is ca (s) + h3po4 (aq) ca3 (po4) 2 (s) + h2 (g)

In the teapot dome scandal, what did the secretary of the interior albert fall lease

A Material made of equal parts is called what? A. Atom, B. Pure substance, C. Mixture

Part C Why are dichotomous keys useful in classifying a new species?

2. How is the frequency of a wave determined?