10. When a substance is analyzed using an electron microscope, it is found to contain only one type of atom.
This substance is
A an element
B. a mixture
C. neither of the other three
D. a compound

How has the scientific community addressed the safety of chemicals? a. chemicals are repeatedly tested, even those that have existed for a long time. b. existing chemicals are tested if they have never been tested before. c. chemicals are tested if they are suspected to have caused a problem. d. only new chemicals are tested.

Consider the nuclear equation below. 239/94 pu—-> x+ 4/2 he. what is x?

If i initially have a gas at a pressure of 12 atm, a volume of 23 liters, and a temperature of 200 k, and then i raise the pressure to 14 atm and increase the temperature to 300 k, what is the new volume of the gas?