Modeling Nuclear Processes Quick Check:
Which phrase best describes nuclear fusion?
(❌)a series of reactions in which particles from one reaction trigger the next reaction
(❌)the spontaneous emission of radiation from an unstable nucleus
(✔️)the process by which small nuclei combine into a larger nucleus
(❌)the process by which a large nucleus is divided into smaller nuclei
Which phrase describes a nuclear chain reaction?
(❌)a type of reaction which only takes place in the sun and other stars
(❌)a reaction in which particles spontaneously emit radiation
(✔️)a series of reactions in which particles from one reaction trigger the next reaction
(❌)a reaction in which small nuclei combine into a larger nucleus
Which option would be an appropriate model of nuclear fission?
(❌)cutting a cake in half
(❌)dividing a stack of paper equally between two people
(❌)taking a teaspoon of sugar from a bowl
(✔️)disturbing a drop of water such that it breaks into smaller droplets
The process of radioactive decay is unpredictable and irreversible. Which option would be an appropriate model of the radioactive decay of a group of atoms?
(❌)throwing tennis balls over a fence
(❌)breaking off pieces of wet clay
(❌)petals falling from a flower
(✔️)popping a bag of popcorn
Which statement best describes the effect of radioactive decay on a nucleus?
(❌)The resulting nucleus is less stable than the original nucleus. The nucleus must be of the same element as the original.
(❌)The resulting nucleus is more stable than the original nucleus. The nucleus must be of the same element as the original.
(❌)The resulting nucleus is less stable than the original nucleus. The nucleus can be of a different element than the original.
(✔️)The resulting nucleus is more stable than the original nucleus. The nucleus can be of a different element than the original.
1. The number of freely moving neutrons increases over time
2. A neutron should be expressed as 10n, not 01n
3. The table tennis balls represent neutrons that are released when the nucleus splits and cause other nuclei to split
4. The total mass number of the reactants should equal the mass number of the products
5. The nucleus with the largest mass will split into two or more relatively large pieces
Modeling Fission quick check
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Can some post all the answers for "Modeling Fission Quick Check"
1. Which fact is true during a fission chain reaction?(1 point)
2.A neutron strikes an atom of uranium-235 to start a fission reaction. A student expresses this situation as 01n+235 92U. Which statement describes why the expression is incorrect?(1 point)
3. It is possible to make a model of a fission chain reaction with mousetraps and table tennis balls, with the balls placed on an armed trap. Which statement best explains why this is a good model?(1 point)
4. A student writes out an equation to represent a fission reaction. How can the student check that the equation is correctly written?(1 point)
5. Which change will always take place during nuclear fission? Is the answer: "Several neclei will combine into one neclei"?
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Also, Thank you so much Some1 for letting me know that Samado's answers are correct! Thank you so much!
For our future fellows here are correct answers again since I just did it and I got 100%
Modeling Fission quick check
1. The number of freely moving neutrons increases over time
2. A neutron should be expressed as 10n, not 01n
3. The table tennis balls represent neutrons that are released when the nucleus splits and cause other nuclei to split
4. The total mass number of the reactants should equal the total mass number of the products
5. The nucleus with the largest mass will split into two or more relatively large pieces
Samado's answers are correct on all questions for the "Modeling Fission Quick Check", just got a 100%
Is there anyone to post the answers for q's 1-5
Chemistry B Final Exam, please do give the correct answers to check my work.
1. Given the general trend with bond energies, which of the compounds would have the smallest bond energy?
2. Based on the differences in electronegativities, with which atom is francium (Fr) most likely to form an ionic bond?
3. Which statement is the best description of the energy found in molecules of water?
4. When potassium permanganate and glycerol react, the potential energy of the products is less than the potential energy of the reactants. Which statement about this reaction is correct?
5.Hydrochloric acid and sodium hydroxide react to produce water and sodium chloride in an endothermic reaction. Which statement must be true of the reaction?(1 point)
6. Imagine a graph. The x-axis is labeled "Time" and is measured in seconds, and the y-axis is labeled "Potential Energy" and is measured in kilojoules. The slope starts at 0 seconds with a plateau at 25 kJ. This plateau is labeled "Reactants." The slope then rises to a peak labeled "Activation Energy" at 78 kJ. Finally the slope drops to a plateau at 14 kJ and is labeled "Products."
What does the graph described above represent?
7.Endothermic reactions absorb a lot of energy. Exothermic reactions give off a lot of energy. Which type of reaction has a higher activation energy? Which one takes more energy to break up the bonds of the reactants?
8.Why is thermal energy (heat) required to freeze ice into crystals?(1 point)
9. Cobalt ions form complex ions with water and chloride as shown in the reaction. The left side of the reaction is pink, and the right side of the reaction is blue.
Co(H2O)62+ + 4Cl– + heat ⇄ CoCl42–+ 6H2O
Which statement about the system at equilibrium is correct?
10.Why are rubber and metal both useful while making wire?(1 point)
11.A pharmaceutical company wants to extract an ingredient from pomace supplied by a certain food processing plant. Which process is the most efficient with the lowest environmental impact?
12.Which option is a modern reason for optimizing the mining process?(1 point)
13.Use the reaction to answer the question.
Fe2O3 + 3H2SO4
How many atoms of oxygen will be found in the product(s) of the reaction?
14.Use the table and equation to answer the question.
Element Atomic Mass (amu)
hydrogen 1
carbon 12
oxygen 16
CH4 + 2 O2 → CO2 + 2 H2O
The law of conservation of matter states that matter cannot be created nor destroyed. How does the balance equation above demonstrate this law?
15.Elements A and B react according to the following balanced equation.
3A2 + 2B → 2A3B
The molar mass of element A is 4 g/mol. The molar mass of element B is 16 g/mol. When the initial mass of element A is 48 grams, which mass of element B should be present?
16.Use the table of molar masses to answer the question.
Element Molar Mass (g/mol)
silicon 28.09
oxygen 16.00
How many molecules of silicon dioxide (SiO2) are there in a 15-gram sample?
17.Which statement about the number of protons and neutrons in a nuclear change is correct?
18. Which statement accurately describes nuclear fission? (1 point)
19. A nucleus decays to produce a nucleus with one additional proton. Which type of decay did the nucleus undergo?
20. Which type of decay is a form of nuclear fission?(1 point)
21.Why do some atmospheric gases act as greenhouse gases, while others do not?(1 point)
22. Which option correctly identifies a cause and consequence of water pollution?(1 point)
23.Which outcome is the most likely result of eutrophication of a waterway?(1 point)
24.Despite fracking being a controversial process in the fuel industry, it is still used today. Why?