Which change occurs when an atom in an excited
state returns to the ground state?
(1) energy is emitted.
(2) energy is absorbed.
(3) the number of electrons decreases.
(4) the number of electrons increases.

How many moles of gas are present if p=11 atm, v=12l, t=185k?

Complete the following statements to describe solids, liquids, and gases. select the correct answer from each drop-down menu. a solid a definite volume and a definite shape. a liquid a definite volume and a definite shape. a gas a definite volume and a definite shape

You exhale co2 which is produced during cellular respiration.  co2 combines with the water in your blood's plasma to make up one half of the body's most important buffer pair, carbonic acid.  the more physical activity you engage in, the more co2 your body is producing.  you can see this by putting some of the cabbage indicator in a glass and then blowing bubbles into it through a straw.  can you see a change in the color of the indicator?