Determine the number of protons neutrons and electrons in an isotope that has 21 neutrons and a mass number of 40

Cartography is the science of

A 13.0 l sample of helium gas has a pressure of 26.0 atm. what volume would this gas occupy at 8.50 atm? assume ideal behavior.

What does reaction b tell you about the type of molecule h2co3 is?

This gas makes up close to 1/4 of the air surrounding of the earth

Which of the following statements regarding resonance structures is true? 1) They differ only in their arrangement of electrons. 2) The true structure is a hybrid of possible resonance structures.

Using density what is the mass in grams of 150mL of a liquid with a density of 1.4 g/mL

All of the following can be recycled except clothing aluminum cans compact fluorescent bulbs plastic drink bottles

Use Henry's law and the solubilities given below to calculate the total volume of nitrogen and oxygen gas that should bubble out of 1.0 L of water upon warming from 25 ∘C to 50 ∘C.

Washing soda, a compound used to prepare hard water for washing laundry, is a hydrate, which means that a certain number of water molecules are included in the solid structure.

When you light a fire place what energy transformation takes place