16. A sample of gas at a temperature of 250 K has a volume of 2.00 L. The pressure remains constant. What is the volume of the gas at a temperature of 500 K?
A sample of gas at a temperature of 250 K has a volume of 2.00 L. The pressure remains constant. What is the volume of the gas at a temperature of 500 K?
A. 4.00 L
B. 2.00 L
C. 5.00 L
D. 1.00 L
13. Chlorine has the electron configuration 1s22s22p63s23p5. How many valence electrons does it have?
17
5
7
3
21. true or false ( The mass percent of a solution that has 0.75 mol of NaOH in 100 g of solution is 3.0%.)
29. Which experimental observation led scientists to speculate that cathode rays contained particles that were constituents of all matter?
A.The rays were independent of the type of material from which the electrodes were made.
B.The rays were deflected by magnetic fields.
C.The rays were deflected by electrical fields.
D.All of the above provided evidence of the “fundamental” nature of cathode rays.
30. After one half-lives, what percentage of the original radioactive isotope remains in a sample
A.75
B.50
C.0
d.25
Heptane is always composed of 84.0% carbon and 16.0% hydrogen. This illustrates the Law of
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