What is the percent composition by mass of nitrogen in NH4NO3 (gram-formula mass = 80.0 grams/mole) ?

(1) 17.5% (3) 52.5%

(2) 35.0% (4) 60.0%

Why are nutrient molecules important? a. the body breaks down the molecules into the molecules it needs. b. the body combines the nutrient molecules and elements. c. the nutrient molecules are not important. d. the body eats the molecules.

A bird is able to easily soar when it flies over a thermal. A thermal is a current of warm air that is heated by the ground and rises up into the sky, taking the bird with it. What is this an example of? A. Conduction B. Radiation C. Contusion D.

Which of the following solutions has the highest concentration of sugar? A. A sweetened drink is mostly water mixed with 2 grams of sugar B. A sugar solution in a bird feeder is 75% water and 25% sugar C. There is not enough information to tell D.

You are at school 7:15-1:45 (6.5) every day. how many second is this

What is a Trojan hores

Visible light is the A. highest energy level on the electromagnetic spectrum. B. only part of the electromagnetic spectrum that can be seen by humans. C. lowest energy on the electromagnetic spectrum.

Which of the following is likely to be the most valid source of information about pollution?

Which traits did Meiolania have

One of the alkali metals reacts with oxygen to form a solid white substance. when this substance is dissolved in water, the solution gives a positive test for hydrogen peroxide, h2o2.

Whats more metallic silicon sodium sulfur or thallium