Choose the factor below that is likely to have led to the greatest number of mass extinctions.     Earthquakes UV radiation Temperature change Asteroids

Q: Copper acetate containing Cu-64 is used to study brain tumors. This isotope has a half-life of 12.7…

A: Answer: Option a ---> 3.125 x 10-4 g Solution: (1/2)n = x where,      n = number of half lives…

Q: The half-life of 218Po is 3.1 minutes. How much of a 146 gram sample remains after 0.40 hours? 130…

A: Since the decay reactions are first order reactions And we know that the relationship between the…

Q: A sample of organic origin was tested to determine its approximate age. About 63%of its C-14 had…

A: We have to predict the age of sample.

Q: 120 mg sample of technium 99m is used for a diagnostic test. if a technium 99m has a half-life of…

A: Given- Initial mass = 120 mg Half life = 6.0 hrs To find- milligrams of the technetium 99M sample…

Q: Consider the radioisotope ²²⁶Ra (half life = 1.60 × 10³ years). What is the first order rate…

A: Using the formulas of first order kinetics we can solve this problem.

Q: Given a solution containing 0.010 M CaCl2 and O.020 M MgCl2, what is the activity of Ca2+? O 0.0034…

A: Given: Concentration of CaCl2 = 0.010 M And concentration of MgCl2 = 0.020 M

Q: 1. A 20 mg sample of a pesticide has a half-life to 25 years. How long would it take to reduce the…

A:

Q: After 50 years, what mass (in g) remains of a 200.0 g sample of a radioactive isotope with a…

A: Given, Initial mass of sample= 200g Half life= 10 years t= 50 years Since we know that K(decay…

Q: For a radioisotope where k=1.5x10-4yr-1, how old is a sample when only 10% remains? 15,000 years…

A: The details solution for this is provided below in attach image.

Q: The nuclide 9038Sr is one of the extremely hazardous species in the residue of nuclear power…

A: First the rate constant value is calculated.

Q: Americium-241 is widely used in smoke detectors. Calculate the amount of americium-241 consumed in a…

A:

Q: Petroleum is a fossil fuel containing many different carbon compounds. If the carbon atoms in…

A:

Q: Radioisotope X has a half-life of 4.0 h. Based on the figure below, if the original sample of the…

A: Half life (t1/2) :-  The time required for the concentration of reactant to reduce to half of its…

Q: The isotope carbon-14 is radioactive and has a half-life of 5730 years. If you start with a sample…

A:

Q: The synthetic radioisotope technetium-99, which decaysby beta emission, is the most widely used…

A: It is given that the reaction is radioactive decay of technetium-99.  As it is known all the…

Q: Where does the following first order equation K-0.693/t 1/2...(1) come from and why is this equation…

A:

Q: Consider the radioisotope "Ca (half life = 1.03 × 105 years). What is the first order rate constant…

A: Rate constant is 6.73 x 10-6 yr-1

Q: 15) A sample of radioactive material contains 1030 atoms. If the half-life is 6hours, then, the…

A: Radioactive decay is the decay in which an unstable nucleus is broken into a number of smaller…

Q: Find the partial half-lives of the isotope 22-Na when it decays by a) electron capture b) positron…

A:

Q: Carbon dating can be applied to organic materials up to 5.0 × 104 years old. What percentage of the…

A:

Q: The half-life of Plutonium-241 is 9 years. How much of an initial 190 g sample will remain after 31…

A: The half-life of Plutonium-241, t1/2 = 9 years Initial mass of Plutonium-241, No = 190 g time…

Q: The radioactive nuclide 170Ta undergoes first-order decay with a half-life of 6.76 min. If a…

A:

Q: (c) The radioactive decay of nuclides is a first order process. Strontium-90 decays via yttrium-90…

A:

Q: Q#3 Iodine-123, used in the treatment of thyroid, brain, and prostate cancer, has a half-life of…

A: Given :  Half life(t1/2) = 13.2 hr  Given time (t) = 26.4 hr  Mass of sample = 64 mg  t1/2=0.693K…

Q: The intensity of radiation of a radioactive substance was measured at half-year intervals. The…

A: Radioactive decay follows first order kinetics. The intensity of radioactivity decays with time. The…

Q: The half-life of U23892 undergoing α-decay is 4.5 × 109 years. What is the decay rate for a 1.0-g…

A:

Q: 9. A sample of a compound is found to have a half-life of 14.65 seconds. Answer the following…

A: This question is related to chemical kinetics.  A first-order reaction is a chemical reaction in…

Q: Consider the radioisotope 226Ra (half life = 1.60 x 10' years). What is the first order rate…

A: Given the question in half life of Ra is 1.60×103 years.  Calculate the rate constant of first order…

Q: Corrected True/False: Indicate whether each statement is true or false by circling the word true or…

A: In a potential energy diagram ,the activated complex is at a maximum potential energy for the system…

Q: After 7.0 half-lives, how much P-32 will be left from an original sample of 225 grams? N = N0(1/2)n…

A: The formula is given as: N = N0(1/2)n -------1 where, N = amount of reactant left N0 = original…

Q: The 1st-order decay of a particular radioactive element has a half-life of 1.234 days. How many…

A: Given information, Half-life = 1.234 days Time (t) = 5.67 days Initial mass = 891.0 grams

Q: half-life of a radioactive substance is 10 days and there are 10 grams initially. What is the…

A:

Q: Stable isotopic ratios often indicate the presence and rate of certain processe Which of the…

A: The atomic number (An) of an element furnishes information about the equal value of the number of…

Q: The graph below shows the rate of decay of the radioactive isotope K- nto Ar-40 and Ca-40. Analysis…

A: Given : We have to calculate half life of the reaction.

Q: 28-18. You order a sample of Na,PO, containing the radioisotope phosphorus-32 (1,/2 14.3 days). If…

A:

Q: The radioactive isotope phosphorus-32 is often used in biochemical research. Its half-life is 14.28…

A: Given: The half-life of phosphorus-32 is 14.28 days. The mass of sample of K332PO4 is 118 mg.

Q: Half-lives Fill in the Half-life table. Half Fraction % life Remaining Remaining 1 100% 1 1/2 50%…

A: This question is based on simple mathematics used in chemical kinetics.

Q: The half-life of strontium-90 is 28 years. Suppose we have a 80 mg sample. (a) Find a function that…

A: Decay reaction of radioactive element is of first order. And for first order reaction, rate of the…

Q: The half-life of Radium-226 is 13 years. How much of an initial 179 g sample will remain after 36…

A: Radio active reactions are first order reactions. Decay constant (k) = 0.693 / t1/2 Where, t1/2 =…

Q: Choose all of the statements about nuclear reactions that are false. Radioactive decay is a first…

A: ◾ Radioactive decay is first order kinetics . This statement is correct. Decay rate is directly…

Q: 234 Calculate how long it will take for a sample of 4Th with a half-life of 24.1 days to decay to…

A: Since , you have posted multiple questions, we will solve the first question for you .If you need…

Q: erage rate of disappearance of H2O2 over the time period from t-0s to t-61 sis found to be 507tvgwe…

A: Rate of reaction is change in concentration of products and reactants in given time interval. From…

Q: The ratio of Carbon-14 with Carbon-12 is given by the formula R=- 10-2 /0223_where t is the time in…

A: Given: The ratio of C-14 with C-12 is given by the formula, => R = 11012e-t8223 Where t = time…

Q: The half-life of the radioactive isotope 137Cs is 30.17 years. How long does one have to wait until…

A:

Q: Dinitrogen trioxide, N2O3, is largely dissociated into NO and NO2 in the gas phase where there…

A: In equilibrium, the forward reaction rate and the backward reaction rate both must be equal.

Q: half-life of 44,495 days. How many grams of iron-59 decompose after one month (assume it is in…

A: We will use first order kinetics formula to get final mass of compound

Q: Sodium-24 has a half-life of 15.0 hours. Suppose you had a sample containing 0.010 moles of Na-24.…

A:

Q: Consider the radioisotope ⁴¹Ca (half life = 1.03 × 10⁵ years). What is the first-order rate constant…

A: We know that All the radioactive substances follow first order kinetics. the half life and rate…

Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.