Unit 1 Physics Exam S1 2019 B and C only

Can you identify the acceptable exposure limits for affected populations in occupational and nonoccupational environments?

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Create a model that explains a nuclear reaction within the context of its application :  Nuclear fission reactors  An equation for the nuclear reaction in your model  A visual representation of the nuclear reaction occurring  A written explanation of the reaction and how energy and matter are transformed and conserved throughout the reaction  The context and/or application of the nuclear reaction  Where does the reaction occur?  What impact or relevance does this reaction have to society?

E Enthalpy - Chemistry - OpenStax b A uranium-235 nucleus decays by x 101 Chem101 + X app.101edu.co Submit Question 20 of 29 For the chemical reaction Ca (s) + ½ O2 (g) What is the enthalpy for the reaction 2 CaO (s) → 2 Ca (s) + O2 (g)? CaO (s) AH° = -635 kJ/mol. |kJ/mol 1 3 4 8. 9. +/- x 100 10:40 PM O Type here to search 12/7/2019 LO

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The ratio of the isotopes carbon-14 (14C, radioactive and decaying) to carbon-12 (12C non-radioactive and non-decaying) is an important indicator to determine age of fossils, woods and other organic remnants of plants and animals. Assume an animal skeleton was found with a ration 14C/12C of 61% and a half-life h of 14C of 5730 years. How long ago did the animal die? State your result as a whole number including the units.

[+ What is the elapsed time for a fossil sample that was found containing 03125g of carbon 14 that was estimated to originally be 80g? The half fe of carbon-14 s 5730 years e the superscript and subscript buttons as needed or you can use the equation function dooks like a square root sign) to write your equitions For the toolbar, press ALT F10 (PC)or ALT FN+F10 (Mac). BI Paragraph Arial 14px AV e I. Q ... 国 x X, 8 田vロ 田田用回 T (1)

a) Chemical X has a half-life of 27 days. Based on this, if we have 3 liters of pure Chemical X today, how much pure Chemical X will we have in one week (i.e. seven days)? 10. b) By doing detailed regression analysis, the mad scientist Doctor Z has determined that his blob is growing exponentially with its weight, in kilograms, given by W(t) = 0.005e0.00023t where t is in seconds. How long will it take for the blob to weigh 100 kg (and thus be able to serve as an effective weapon against Doctor Z's archrival Professor U?)

Save & Exit Certily Lesson: 5.5a Applications of Exponential F... DSHUN EDWARDS 2/11 Question 3 of 9, Step 1 of 1 Correct Bones from the skeleton of a fish have lost 75 percent of their carbon-14. Note that for carbon-14, the constant of proportionality is approximately k = 0.000124. Estimate the age of the bones. Round to the nearest tenth of a year. Answer How to enter your answer (opens in new window) E Keypac Keyboard Shortcu years Exit session US E ovo L-57 PROPERTY OF RICHARD BLAND COLLEGE

14. Using a mass spectrometer, a sample of an ancient wooden object was found to have a ratio of 14C to 12C equal to 3.3×10 −13 as compared to a current biological sample, which has a ratio of 14C to ¹2C of 1.2×10 −12 (Given: t, is 5730 years) What is the age of the object? 15. For the reaction, 2 A(g) + B₂(g) → 2 AB(g) The rate law is; rate = k[A][B₂]³ At 22.0 °C, k = 1234 M-³s-¹. What would be the rate of the reaction if the concentration of A is 0.100 M and concentration of B₂ is 0.125 M.

Unit 4 ACT. 1-4 C

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Why it is important to study nuclear chemistry in reference to engineering, especifically, Industrial Engineering. Discuss the importance of knowing the lessons behind this topic.

Americium-241 is widely used in smoke detectors. Calculate the amount of americium-241 consumed in a smoke detector (initially containing 5.0000 µg of Am), in micrograms, that has been used for 1.000 year if the half-life is 433 years. Tap here or pull up for additional resources @ 2 # 3 $ 4 Question 24 of 30 % 5 & 7

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MINI TASK #1 Research on Hydrogen isotopes and their applications. Submit a written report.

What are the merits and limitations of precipitation methods? Give an example where the precipitation method cannot be applied to separate two radioisotopes

18. Why is the neutron to proton ratio so important? Scientists made up this concept because they wanted to create radiation. An atom's nucleus likes to have the same number of neutrons and protons, so knowing that ratio is important. It determines the stability of the nucleus based on the shielding effect of the neutrons. The neutron to proton ratio describes a radioactive element's half-life. hp esc @ # $ &. 1 2 4. W e r y tab 10

Does the amount of radiation (cpm) increase or decrease as the thickness of the shielding increases (while the distance between the source and the sensor stays the same)?

Probably meant in the calculation that 20*10K+20=0.6, but how did you get that to be 20=6K+12?

You will research how the energy is extracted or produced and try to be very detailed about the process and the chemistry involved (stating equations and reactions). You will also research the impact on the environment when using or producing fuels. Investigating fossil fuel: How is it produced? What is the chemistry involved (stating equations and reactions)? What is the impact on the environment? 300-400 words Investigating nuclear energy: How is it produced? What is the chemistry involved (stating equations and reactions)? What is the impact on the environment? 300-400 words Investigating biofuel: How is it produced? What is the chemistry involved (stating equations and reactions)? What is the impact on the environment? 300-400 words

3) You're wandering around and come upon an interesting looking rock. The rock is slightly radioactive, so you analyze it. The resulting data is as follows: Elapsed Time (s) Counts 962 50 891 100 718 150 598 200 531 250 448 300 413 350 334 400 308 450 287 500 202 550 178 600 154 a. Calculate the value of k using any two of the above data points. b. Use your value of k to determine the half-life of this sample.

A certain drug has a half-life in the body of 2.0 h. Suppose a patient takes one 200. mg pill at 7:00PM and another identical pill 90min later. Calculate the amount of drug left in his body at 11:00 PM. Be sure your answer has a unit symbol, if necessary, and round it to 3 significant digits.

The atomic hydrogen exists in space at an estimated concentration of one particle per cubic meter. If the collision diameter is 2.5 ×10^(–10) meter and the temperature is 2.7 Kelvin, how many kilometers away will the next potential collision be?

Find the associated exponential decay or growth model. (Round all coefficients to three significant digits.) Q = 1,500 when t = 0; half-life = 1   Q=