Plutonium-239 has a decay constant of 2.88×10−5year−1. Part A Part complete What percentage of a 239Pu...
Plutonium-239 has a decay constant of 2.88×10−5year−1. Part A Part complete What percentage of a 239Pu sample remains after 1500 years? N = 95.8 % Previous Answers Correct Part B After 2.40×104 years? N N = % Previous AnswersRequest Answer Incorrect; Try Again; 4 attempts remaining Part C After 1.20×105 years? N N = nothing %
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Plutonium-239 has a decay constant of 2.88×10−5year−1. Part A
Part complete What percentage of a 239Pu...
One of the ions of iron is iron(III). Part A Part complete What is the symbol...
One of the ions of iron is iron(III). Part A Part complete What is the symbol for this ion? Express your answer as an ion. Fe3+ Previous Answers Correct Part B How many protons and electrons are in the ion? Express your answer as whole numbers separated by a comma. p,e− p , e − = Previous AnswersRequest Answer Incorrect; Try Again; 4 attempts remaining Part C Complete previous part(s) Part D Complete previous part(s)
What is the activity of the sample in Bq? Cobalt-60, which undergoes beta decay, has a...
What is the activity of the sample in Bq?
Cobalt-60, which undergoes beta decay, has a half- life of 5.26 yr. N = 3.14x1013 B-particles SU Previous Answers All attempts used; correct answer displayed Part B What is the activity of the sample in Bq? t V AC o XD x x x XI .X.10 > . Submit Previous Answers Request Answer X Incorrect; Try Again; 4 attempts remaining
Review I Constants I Per Part A Hydrogen peroxide decomposes to water and oxygen at constant...
Review I Constants I Per Part A Hydrogen peroxide decomposes to water and oxygen at constant pressure by the following reaction: AH-196 kJ 2 H202()2 H O() +O2(g) Calculate the value of q (kJ) in this exothermic reaction when 5.00 g of hydrogen peroxide decomposes at constant pressure? -14.4 kJ -2.88 x 104 kJ 1.15 kJ -0.0173 kJ -28.8 kJ Request Answer Previous Answers Submit X Incorrect; Try Again; 4 attempts remaining N Provide Feedback
A reaction of the type A→B+C has a rate constant k=3.6× 10 −5 M/s . Part...
A reaction of the type A→B+C has a rate constant k=3.6× 10 −5 M/s . Part A Part complete What is the order of the reaction? What is the order of the reaction? zeroth order first order second order SubmitPrevious Answers Correct Part B What is the molarity of A after a reaction time of 28.0 min if the initial concentration of A is 9.4×10−2 M ? Express your answer using two significant figures. [A] [ A ] = 1920...
The 3.50 kg. 35.0-cm-diameter disk in the figure (Figure 1) spinning at 320 rpm. Part A...
The 3.50 kg. 35.0-cm-diameter disk in the figure (Figure 1) spinning at 320 rpm. Part A How much friction force must the brake apply to the rim to bring the disk to a halt in 2.40 s? Express your answer with the appropriate units. HÅ on ? 42.8 N Submit Previous Answers Request Answer X incorrect; Try Again, 8 attempts remaining Figure < 1 of 1 Provide Foodback Brake
Rev The forces in (Figure 1) are acting on a 3.0 kg object. Part A What...
Rev The forces in (Figure 1) are acting on a 3.0 kg object. Part A What is az, the 2-component of the object's acceleration? Express your answer with the appropriate units. HA ? . X.10 Figure 1 of 1 m Value 82 Submit Previous Answers Request Answer 3.0 N * Incorrect; Try Again; 4 attempts remaining 2.0 N 4.0 N 3.0 N Provide Feedback
Cesium-137, used in cancer treatment, has a half- life of 30 years. are here 1974 used...
Cesium-137, used in cancer treatment, has a half- life of 30 years. are here 1974 used in cancer treatment, has a half- Part A Enter the balanced nuclear equation for the beta decay (e) of cesium-137 Express your answer as a nuclear equation. Α. ΑΣφ on? Subrnit Previous Answers Request Answer Part B How many milligrams of a 24 mg sample of cesium-137 remain after 120 years? Express the mass to two significant figures and include the appropriate units. Value...
The cylinder in the figure(Figure 1) has a moveable piston attached to a spring. The cylinder's...
The cylinder in the figure(Figure 1) has a moveable piston attached to a spring. The cylinder's cross-section area is 10 cm”, it contains 0.0051 mol of gas, and the spring constant is 1500 N/m. At 17 °C the spring is neither compressed nor stretched. Part A How far is the spring compressed if the gas temperature is raised to 120 °C? Express your answer to two significant figures and include the appropriate units. Ar = 0.94 cm cm Submit Previous...
P 7.9 4 of 8 > 1 Review Add the pairs of binary numbers Part 3...
P 7.9 4 of 8 > 1 Review Add the pairs of binary numbers Part 3 1001, and 101: Do not add any extra 0 after the last significant 1 N, Submit Previous Answers Request Answer * Incorrect; Try Again; 4 attempts remaining Part C 10001.1112 and 0101.0012. Do not add any extra 0 after the last significant 1. N2 = Submit Request Answer
Part A II Review A hollow metal sphere has 5 cm and 9 cm inner and...
Part A II Review A hollow metal sphere has 5 cm and 9 cm inner and outer radii, respectively. The surface charge density on the inside surface is -150nC/m2. The surface charge density on the exterior surface is +150nC/m What is the strength of the electric field at point 4 cm from the center? Express your answer to three significant figures and include the appropriate units 86062 N/C Submit Previous AnswersRequest Answer X Incorrect; Try Again; 4 attempts remaining Part...
What is the activity of the sample in Bq?
Cobalt-60, which undergoes beta decay, has a half- life of 5.26 yr. N = 3.14x1013 B-particles SU Previous Answers All attempts used; correct answer displayed Part B What is the activity of the sample in Bq? t V AC o XD x x x XI .X.10 > . Submit Previous Answers Request Answer X Incorrect; Try Again; 4 attempts remaining
Review I Constants I Per Part A Hydrogen peroxide decomposes to water and oxygen at constant pressure by the following reaction: AH-196 kJ 2 H202()2 H O() +O2(g) Calculate the value of q (kJ) in this exothermic reaction when 5.00 g of hydrogen peroxide decomposes at constant pressure? -14.4 kJ -2.88 x 104 kJ 1.15 kJ -0.0173 kJ -28.8 kJ Request Answer Previous Answers Submit X Incorrect; Try Again; 4 attempts remaining N Provide Feedback
The 3.50 kg. 35.0-cm-diameter disk in the figure (Figure 1) spinning at 320 rpm. Part A How much friction force must the brake apply to the rim to bring the disk to a halt in 2.40 s? Express your answer with the appropriate units. HÅ on ? 42.8 N Submit Previous Answers Request Answer X incorrect; Try Again, 8 attempts remaining Figure < 1 of 1 Provide Foodback Brake
Rev The forces in (Figure 1) are acting on a 3.0 kg object. Part A What is az, the 2-component of the object's acceleration? Express your answer with the appropriate units. HA ? . X.10 Figure 1 of 1 m Value 82 Submit Previous Answers Request Answer 3.0 N * Incorrect; Try Again; 4 attempts remaining 2.0 N 4.0 N 3.0 N Provide Feedback
Cesium-137, used in cancer treatment, has a half- life of 30 years. are here 1974 used in cancer treatment, has a half- Part A Enter the balanced nuclear equation for the beta decay (e) of cesium-137 Express your answer as a nuclear equation. Α. ΑΣφ on? Subrnit Previous Answers Request Answer Part B How many milligrams of a 24 mg sample of cesium-137 remain after 120 years? Express the mass to two significant figures and include the appropriate units. Value...
The cylinder in the figure(Figure 1) has a moveable piston attached to a spring. The cylinder's cross-section area is 10 cm”, it contains 0.0051 mol of gas, and the spring constant is 1500 N/m. At 17 °C the spring is neither compressed nor stretched. Part A How far is the spring compressed if the gas temperature is raised to 120 °C? Express your answer to two significant figures and include the appropriate units. Ar = 0.94 cm cm Submit Previous...
P 7.9 4 of 8 > 1 Review Add the pairs of binary numbers Part 3 1001, and 101: Do not add any extra 0 after the last significant 1 N, Submit Previous Answers Request Answer * Incorrect; Try Again; 4 attempts remaining Part C 10001.1112 and 0101.0012. Do not add any extra 0 after the last significant 1. N2 = Submit Request Answer
Part A II Review A hollow metal sphere has 5 cm and 9 cm inner and outer radii, respectively. The surface charge density on the inside surface is -150nC/m2. The surface charge density on the exterior surface is +150nC/m What is the strength of the electric field at point 4 cm from the center? Express your answer to three significant figures and include the appropriate units 86062 N/C Submit Previous AnswersRequest Answer X Incorrect; Try Again; 4 attempts remaining Part...
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