Carbon-14, which is present in all living tissue, radioactively decays via a first-order process. A one-gram sample of wood taken from a living tree gives a rate for carbon-14 decay of 13.6 counts per minute. If the half-life for carbon-14 is 5720 years, how old is a wood sample that gives a rate for carbon-14 decay of 7.9 counts per minute? A. 5.3 x 102 yr. B. 7.6 x 102 yr. C. 1.1 x 103 yr. D. 9.5 x 103 yr.
Answers: 1
Chemistry, 21.06.2019 18:00
When the following equation is balanced using the smallest possible integers, what is the coefficent of oxygen gas? c7h16o(g) + o2(g) โ co2(g) + h2o(g) -1 -5 -8 -16 -21
Answers: 3
Chemistry, 22.06.2019 15:20
Draw any one of the skeletal structures of a 2ยฐ alkyl bromide having the molecular formula of c6h13br and two stereogenic centers. indicate chirality by using wedge and hashed wedge notation. lone pairs do not need to be shown.
Answers: 1
Chemistry, 22.06.2019 21:30
Electromagnets coils of wire paper clips picked up 10 3 15 6 20 9 25 12 ms. owens' class was studying magnets. ms. owens showed her students how to make an electromagnet using a nail, a d-cell battery, and plastic coated wire. the students wrapped the wire around the nail and then attached the ends to the battery. when they were finished, they tested their magnets by investigating how many paperclips their magnets could pick up. they also tested whether they could increase the strength of their electromagnets by using more coils of wire. they recorded the class average of their results in the data table seen here. ms. owens asked her students to graph their data in a line graph. how should the students label the x-axis on their line graph? a) size of battery b) number of paper clips c) number of coils of wire d) strength of electromagnet
Answers: 2
Chemistry, 22.06.2019 22:50
At the current rate, a graph of carbon dioxide produced by fossil fuels over time would slope upward slope downward be horizontal be vertical
Answers: 3
Carbon-14, which is present in all living tissue, radioactively decays via a first-order process. A...
Mathematics, 24.03.2020 21:10
English, 24.03.2020 21:10
Biology, 24.03.2020 21:10
English, 24.03.2020 21:10
Mathematics, 24.03.2020 21:10
Mathematics, 24.03.2020 21:10
History, 24.03.2020 21:10
Mathematics, 24.03.2020 21:10
Mathematics, 24.03.2020 21:10
Chemistry, 24.03.2020 21:10
History, 24.03.2020 21:10