Chemistry, 23.02.2020 22:20 costel8532
While exploring a coal mine, scientists found plant fossils which had been preserved by an earthquake in the ceiling of the mine. Samples taken from one of the fossils had carbon‑14 activities of 20.0 counts / min. A reference sample of the same size from a plant alive today has a carbon-14 activity of 160.0 counts / min. If carbon‑14 has a half-life of 5730 years, what is the age of the plant fossil in years?
Answers: 3
Chemistry, 21.06.2019 13:00
What is common about these molecules? a.their atoms are held together by covalent bonds. b.they are all made up of the same two atoms. c.their atoms are held together by ionic bonds. d.they are all made up of oxygen atoms only.
Answers: 3
Chemistry, 21.06.2019 13:00
What are the concentrations of hydroxide and hydronium ions in a solution with a ph of 10.2?
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Chemistry, 21.06.2019 20:10
Which statement is true about the part of the electromagnetic spectrum that human eyes can detect? it contains only the colors of the rainbow and television waves. o it is divided into seven ranges of wavelengths. it contains ultraviolet, visible, and infrared light. it is divided into nine ranges of wavelengths.
Answers: 2
Chemistry, 22.06.2019 04:00
You encounter a solution that is acidic and you decide to test it by adding a small amount of a strong acid. the ph lowers slightly but is approximately unchanged, and still remains acidic. what can you say about the solution? a. it is a buffer solution. b. it is not a buffer solution it is a strong acid solution. d. the solution has been neutralized. e. the solution has excess acid present
Answers: 1
While exploring a coal mine, scientists found plant fossils which had been preserved by an earthquak...
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