An atom's valence electrons are those electrons that have the highest energy

True or False?

When NH4NO3 spontaneously dissolves in water the temperature of the solution decreases. What factors make this a naturally occurring process?

A chemist attempts to separate barium ions from lead ions by using the sulfate ion as a precipitating agent. the ksp values of baso4 and pbso4 are 1.1 * 10-10 and 1.6 * 10-8, respectively.

An antacid tablet added to a glass of water fizzes and bubbles as it mixes. Which of the indicators of a chemical change is represented in this scenario? A) formation of a precipitate B) change in energy C) formation of a gas D) change in color

The benefit of fusion is that it:

What kind of atom has 79 protons in its nucleus

A nuclear reaction only involves valence electrons. True or False?

If a farmer wants to increase the health of his crops, he could apply a nitrogen-based fertilizer. why is nitrogen important to plants?

A car battery produces electrical energy with the following chemical reaction. Pb + PbO2 + 2H2SO4; 2PbSO4 + 2H2O What is the mole ratio of PbO2 to water?

Which of the following is an example of the electrostatic force acting in a atom a. a neutron attracting a electron b. a neutron attracting a proton c. an electron attracting another electron d. a proton attracting an electron

When does water move between the surface of earth and the atmosphere