Which element has exactly five electrons in the highest principal energy level (the outer shell) ?

a. B

b. Ba

c. P

d. Mn

If a geologist found two fossils of different species buried next to each other in a rock layer, he or she might hypothezise that the two organisms may have been alive during the same period. true or false

What element has the electron configuration 1s2 2s2 2p6 3s2 3p1?

Determine the potential deaths resulting from the following exposure to chlorine: a. 210ppm for 150 min. b. 300ppm for 50 min. c. 350ppm for 20 min.

What type of protection would effectively protect against alpha particles? A. Air molecules B. Human skin C. pH meter D. Uranium

In a heat engine, if 700 J of heat enters the system, and the piston does 400 J of work, what is the final internal (thermal) energy of the system if the initial energy is 1,200 J?

What is demetri mendeleyev given credit for developing

Acetone used for rinsing glassware Group of answer choices 1. Pour it down the sink where you are rinsing the glassware 2. Collect it and dispose of it in the organic or acetone waste container 3.

Suppose a 500. mL fiask is filled with 1.8 mol of Cl 2, 0.60 mol of HCl and 0.40 mol of CCl4. The following reaction becomes possible: ci2 (g) + CHCİ 3 (g) - HCI (g) + CC, (g) The equilibrium constant K for this reaction is 5.

What combination of factors can change dry ice into a liquid

Rob is conducting an experiment in which he measures a person's body temperature in response to changes in air temperature. What is the independent variable that is manipulated in the experiment?