A volcanic eruption melts a large area of rock, and all gases are expelled. After cooling, ""Ar (atomic number 18) accumulates from the ongoing decay of 4"K (atomic number 19) in the rock (t/2 = 1.25 x 10' yr). When a piece of rock is analyzed, it is found to contain 1.33 mmol of 4"K and 'Ar. How long ago did the rock cool? Enter your answer in scientific notation. 40 1.47 mmol of 40 10 (select) + years

A volcanic eruption melts a large area of rock, and all gases are expelled. After cooling, ""Ar (atomic number 18) accumulates from the ongoing decay of 4"K (atomic number 19) in the rock (t/2 = 1.25 x 10' yr). When a piece of rock is analyzed, it is found to contain 1.33 mmol of 4"K and 'Ar. How long ago did the rock cool? Enter your answer in scientific notation. 40 1.47 mmol of 40 10 (select) + years

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

See similar textbooks

Similar questions

What quantity of energy would be produced as 1 atom of plutonium-238 undergoes alpha decay?
..... The molar mass of......
c) Lead-210 isotope (21°Pb) is a radioactive pollutant presents in tobacco leaves, which may be one of the cancer-causes for smokers. This lead-210 is originated from several decays of radon-222 typically found in the soil gas and surface air layer in the tobacco fam. i) The possible decay series from radon-222 to produce lead-210 is as follows: 21Po 214Pb Bi 214Po → Pb Compieie ühe decay series by consirucing a suiiabie baianced nuciear reaction equation for each decay step. ii) Lead-210 has a long half-life (fo.5) (approximately 20.4 years). Based on this statement, suggest the reason(s) why high lead-210 content in cigarettes is hazardous for smokers' health.
The half-ile for the radioactive decay of C-14 a 5730 years How long will R take for 30% of the C-14 atoms in a sample of C-14 to decay? Express your answer using two significant figures. You may wart to referonce (Page) Section 144 while oompleting this problem years Submit Hequest Answer Part 8 Ila sample of C-14 initially contains 1.2 mmol of C-14, how many millimoles will be let after 2250 years? Express your answer in millimoles using two signiticant figures. * • O a ? mmol Submit Beauest Anawer Provide Feedback
(A) if both sentences are true, (B) if both sentences are false, (C) if the first sentence is true but the second is false, and (D) if the first sentence is false but the second is true. 1. Radioactive elements gain stability by single emission, and a successive emission creates a series. Half-life is the half of the amount of life that a radioactive material will continue to exist before it decays completely. 2. When water is mixed with metals, a metal hydroxide is formed and oxygen gas is evolved. The evolution of the oxygen gas from the reaction of metals and water is indicated by the hastened consumption of the splinter. 3. When water is mixed with sodium carbonate, a weak base will be formed. When water is mixed with sodium chloride, a weak base will be formed. 4. In the Winkler Titration Method, sodium thiosulfate is standardized against a known concentration of magnesium iodate. The normality (N) of a solution is always equal to its molarity (M). 5. Dissolved oxygen (DO) refers…
[References] Use the References to access important values if needed for this question. Radioactive decay can be described by the following equation In A = In Ag - kt where Ag is the original amount of the substance, A is the amount of the substance remaining after time t, and k is a constant that is characteristic of the substance. For the radioactive isotope chromium-51, k is 2.50 x 10-2 days . If the original amount of chromium-51 in a sample is 29.2 mg, how much chromium-51 remains after 30.5 days have passed? mg Submit Answer Retry Entire Group No more group attempts remain
One of the possibilities for producing energy in a star after the hydrogen has burned to helium is 3∝ → 12C (that is, three alpha particles react to form 12C). How much energy is released in this process?
1. (a) The amount of U-238 in a sample decays exponetially. Every 2 billion years, 27% of the sample remains. If U(t) is the percentage of the sample remaining after t billion years, find a formula for U(t)? (If you are unable to do part (a), you may use the function U(t) =80e-/3 for the remaining parts). (b) Find the relative growth rate r, the constant growth factor b, and continuous growth rate k. (c) way to do this problem very easily.) Find the percentage change of U(t) between on the interval (3000, 3001). (Hint: there is a
14. Which Reactant and Product would balance the following nuclear reaction equation? Reactant + 12C --> 11B + Product a. reactant = -10ß , product = 11H b. reactant = +10ß , product = 01n %3! c. reactant = -10B , product = 01n
Use the References to access important values if needed for this quertion. Radioactive decay can be described by the following equation In A = In Ag - kt where Ao is the original amount of the substance, A is the armount of the substance remaining after time t, and k is a constant that is characteristic of the substance. For the radioactive isotope phosphorus-32, k is 4.85 × 10-* days", If the original amount of phosphorus-32 in a sample is 64.9 mg, how much phosphorus-32 remains after 14.6 days have passed? Jmg Submit Answer Retry Entire Group No more group attempts remain
3. PuO2 has a density of 11.5 g cm- and a specific heat capacity of 330 J kg' K-1. A particular old sample (i.e. one that has 'partially decayed*) of PuO2 produces 0.440 kW kg' of heat due to internal radioactive decay. > The power output of a 2.00 cm' sample of this partially decayed' PuO2 is therefore 10.2 J/s. PuO, melts at 2673 K and its latent heat of fusion is 245 kJ kg:!. If we place our 2.00 cm block in a well insulated and heat resistant container when it is at 300 K, then how long is it before the whole block is melted?
The radioactive isotope Cr decays by beta emission. 56 24 If the mass of a sample of chromium-56 decays from 85.8 micrograms to 21.5 micrograms in 11.8 minutes, what is the half-life of chromium-56? Half-life = minutes Submit Answer Retry Entire Group 2 more group attempts remaining