Strontium-90 is a radioactive isotope that is formed in nuclear explosions. The half-life of strontium-90 is 28 years. If a soil sample contains 35 pCi of
strontium-90 in 2000, what will be the activity of the PĀŗsr in this soil sample in 2084?
(Enter your answer to two significant figures.)
pCi
Answers: 3
Chemistry, 22.06.2019 03:00, Dkhaurithompson
Zoe is investigating the composition of substance a, an unknown substance. using chemical processes, she analyzes substance a and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1. what is substance a? a. a compound b. an element c. a heterogeneous mixture d. a homogeneous mixture
Answers: 1
Chemistry, 22.06.2019 03:00, annafellows
Match term definition ellipse a) diagonal cross section of a cylinder circle b) diagonal cross section through the widest part of a sphere sphere c) cross section parallel to the base of a cone great circle d) shape created when a semi-circle is rotated around the y-axis triangle e) perpendicular cross section of a cone
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Chemistry, 22.06.2019 12:40, whitethunder05
When 13.3 g koh is dissolved in 102.7 g of water in a coffee-cup calorimeter, the temperature rises from 21.4 Ā°c to 31.53 Ā°c. what is the enthalpy change per gram of koh (j/g) dissolved in the water? * take the density of water as 1.00 g/ml. * assume that the solution has a specific heat capacity of 4.18 j/g*k. enter to 1 decimal place. do not forget the appropriate sign /(+). canvas may auto-delete the (+) sign
Answers: 2
Strontium-90 is a radioactive isotope that is formed in nuclear explosions. The half-life of stronti...
Mathematics, 26.02.2020 00:11
Mathematics, 26.02.2020 00:11
Mathematics, 26.02.2020 00:12