Weekly Reflection che

The law of conservation of mass states that matter cannot be created or destroyed

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?

3. D +je + SNi 4. P – 32P 15 325 16 5. 12°BA + _ie Ba+ _ĝe 56 6. 23°PU → 94 + 235U

13. Soru Complete the given reaction. Fe(s) + H2SO4(aq) + ........ ........ A) Fe (aq) + SO2(g) B) FeSO4(s) + H2(g) C) FeH2(aq) + H2(g) D) FeH2(aq) + SO2(g)

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An archeologist was investigating a dig site and found charcoal in a pre-historic fire pit. Charcoal consists mostly of the element carbon. There are three naturally occurring isotopes of carbon: 12C, 13C, and 14C. Carbon-14 is radioactive and can be used to date the charcoal. The archeologist collected a sample for testing and learned that the carbon-14 activity was found to be 10 counts per minute. A sample of new charcoal of similar size showed a carbon-14 activity of 640 counts per minute.   How many carbon-14 half-lives have occurred?   Estimate the age of the charcoal. (The half-life of 14C is 5,730 years.)

A radioactive substance decays exponentially: The mass at time t is m(t) = m(0)ek", where m(0) is the initial mass and k is a negative constant. The mean life M of an atom in the substance is M = -k tekt dt. For a radioactive isotope, the value of k is -0.000149. Find the mean life (in years) of the isotope's atom. (Round your answer to one decimal place.) yr

A typical chest X ray exposes a patient to an effective dose of 0.05 mSv. A) How many rem is this? Express your answer to two significant figures and include the appropriate units.   B)How many chest X rays would a patient have to receive before biological effects would be observed? (The limit is >25 rem.) Express your answer using two significant figures.