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10th Grade Chemistry

Hi! I am taking the Unit 8 Lesson 10 chem test now and I have a C in this class so I need to get all the answers correct... If you don't know all that's ok but if you know some please help, thank you! (Connections Academy)

1. In a nuclear reaction, which is the same before and after the change?(1 point)

A)the number of alpha particles
B)the mass
C)the types of atoms
D)the total number of protons

2. Why does the emission of an alpha particle always result in transmutation?(1 point)

A) The protons in the large atom change to neutrons.
B) The atom is converted to helium.
C) Energy is released from the nucleus of the atom.
D) The number of protons in the atom changes.

3. Which phrase describes radioactive decay?(1 point)

A) the joining of small nuclei into a larger nucleus
B) the spontaneous emission of radiation
C) the splitting of a large nucleus into smaller nuclei
D) the triggering of one reaction by the products of another

4. Which option would be an appropriate model of nuclear fusion?(1 point)

A) sewing one piece of fabric to another
B) putting a puzzle together
C) adding a drop of water to a glass of water
D) mashing two marshmallows together

5. Which aspect must be taken into consideration when creating a model of radioactive decay?(1 point)

A) There must not be any particles or energy emitted from the nucleus.
B) There must not be any changes to the element in question.
C) There must be a way for unstable nuclei to become stable nuclei.
D) There must be a predictable and reversible change that occurs.

6. How is fusion different from a simple chemical reaction?(1 point)

A) Energy is released in a fusion reaction, but it is absorbed in a chemical reaction.
B) The nuclei combine in a fusion reaction.
C) Atoms come together in a chemical reaction, but they are split in a fusion reaction.
D) The atoms are bound to each other by electrons in a fusion reaction.

7. Which statement best describes the charged particles in the fusion reaction?

(1 point)

A) There are no charged particles because these are all nuclei, which are neutral.
B) The nucleus with the greatest positive charge is on the left side of the reaction.
C) The nucleus with the greatest positive charge is on the right side of the reaction.
D) There are no charged particles because the positive and negative charges will cancel out.

8. In nuclear reactions, information about the nuclei that take place in the reaction and the nuclei that are produced can be written out in an equation form. When looking at equations like this, how can you identify a reaction as a fission reaction?(1 point)

A) A nucleus with a large mass will be on the left side, and there will be neutrons in the equation.
B) A nucleus with a large mass will be on the left side, and there will be electrons in the equation.
C) A nucleus with a large mass will be on the right side, and there will be electrons in the equation.
D) A nucleus with a large mass will be on the right side, and there will be neutrons in the equation.

9.How is fission different from a simple chemical reaction?(1 point)

A) Fission reactions run out of control, while chemical reactions are controlled.
B) Fission can happen with radioactive forms of atoms.
C) Atoms are split into smaller pieces during fission.
D) Protons cause fission reactions, while chemical reactions involve electrons.

10. Which statement best describes the charges of the particles involved?
(1 point)

A) A neutral particle is striking a positive particle, breaking it into more neutral and positive particles.
B) A negative particle is striking a positive particle, breaking it into more negative and positive particles.
C) A positive particle is striking a neutral particle, breaking it into more positive and neutral particles.
D) A neutral particle is striking a negative particle, breaking it into more neutral and negative particles.

11.Which statement best describes the process of alpha decay?(1 point)

A) An unstable nucleus releases a particle containing two protons and two neutrons.
B) An unstable nucleus releases a single positively charged particle.
C) An unstable nucleus releases an electron.
D) An unstable nucleus rearranges its particles and releases energy.

12. In which type of radioactive decay does the nucleus become more stable without changing its identity?(1 point)

A) beta-plus decay
B) gamma decay
C) alpha decay
D) beta-minus decay

13. An alpha particle is equivalent to the nucleus of an atom of which element?(1 point)

A) helium
B) nitrogen
C) hydrogen
D) carbon

14. Which statement best describes alpha decay?(1 point)

A) After the ejection of an alpha particle, the remaining nucleus has a mass number that is two less and an atomic number that is two less, so alpha decay is not a type of nuclear fission.
B) After the ejection of an alpha particle, the remaining nucleus has a mass number that is two less and an atomic number that is two less, so alpha decay is a type of nuclear fission.
C) After the ejection of an alpha particle, the remaining nucleus has a mass number that is four less and an atomic number that is two less, so alpha decay is a type of nuclear fission.
D) After the ejection of an alpha particle, the remaining nucleus has a mass number that is four less and an atomic number that is two less, so alpha decay is not a type of nuclear fission.

15. Which option correctly compares beta decay and gamma decay?(1 point)

A) Beta decay releases a particle, while gamma decay only reduces the energy level. Beta decay is a form of nuclear fission, but gamma decay is not.
B) Beta decay releases a particle, while gamma decay only reduces the energy level. Neither beta decay nor gamma decay is a form of nuclear fission.
C) Beta decay only reduces the energy level, while gamma decay releases a particle. Gamma decay is a form of nuclear fission, but beta decay is not.
D) Beta decay only reduces the energy level, while gamma decay releases a particle. Neither beta decay nor gamma decay is a form of nuclear fission.

16. Use the equation to complete the activity.

219 86Rn→215 84Po+α
The nuclear equation shows the transmutation of a form of radon into polonium and an alpha particle. In one to two sentences, explain whether or not the reaction is balanced.

(2 points)

17. Nuclear reactions can be written out in equation form with information about the nuclei that take place in the fusion reaction and the nuclei that are produced. In one to two sentences, explain how you would identify the reaction as fusion, and give two different criteria.(2 points)

18. Use the equation to answer the prompt.

10 6C→10 5B+ 0+1e
A student claims that the equation models beta-minus decay because the atomic number of the nucleus decreases by one. In one or two sentences, explain the error in the student’s reasoning.

Thats all of them (*^▽^*)

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  1. 1. the total number of protons
    2. the number of protons in the atom changes
    3. the spontaneous emission of radiation
    4. mashing two marshmallows together
    5. There must be a way for unstable nuclei to become stable nuclei.
    6. The nuclei combine in a fusion reaction.
    7. The nucleus with the greatest positive charge is on the right side of the reaction.
    8. A nucleus with a large mass will be on the left side, and there will be neutrons in the equation.
    9. Atoms are split into smaller pieces during fission.
    10. A neutral particle is striking a positive particle, breaking it into more neutral and positive particles.
    11. An unstable nucleus releases a particle containing two protons and two neutrons.
    12. gamma decay
    13. helium
    14. After the ejection of an alpha particle, the remaining nucleus has a mass number that is four less and an atomic number that is two less, so alpha decay is a type of nuclear fission.
    15. Beta decay releases a particle, while gamma decay only reduces the energy level. Neither beta decay nor gamma decay is a form of nuclear fission.
    16. essay (the equation is balanced)
    17. essay
    18. essay (model is beta plus decay, not beta minus)

    not sure if the essay question tips are right, mine hasnt been graded yet

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  2. I haven't done mine yet, since yours hasn't been graded yet when it is can you please tell me... It would be greatly appreciated... I just really need to pass this 😅

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  3. Actually I took the test and you are correct! Tysm 💙💙

    1. the total number of protons
    2. the number of protons in the atom changes
    3. the spontaneous emission of radiation
    4. mashing two marshmallows together
    5. There must be a way for unstable nuclei to become stable nuclei.
    6. The nuclei combine in a fusion reaction.
    7. The nucleus with the greatest positive charge is on the right side of the reaction.
    8. A nucleus with a large mass will be on the left side, and there will be neutrons in the equation.
    9. Atoms are split into smaller pieces during fission.
    10. A neutral particle is striking a positive particle, breaking it into more neutral and positive particles.
    11. An unstable nucleus releases a particle containing two protons and two neutrons.
    12. gamma decay
    13. helium
    14. After the ejection of an alpha particle, the remaining nucleus has a mass number that is four less and an atomic number that is two less, so alpha decay is a type of nuclear fission.
    15. Beta decay releases a particle, while gamma decay only reduces the energy level. Neither beta decay nor gamma decay is a form of nuclear fission. (These are all z's answers) :)

    The essay questions haven't been graded but these are my answers.

    16. Because the alpha particle was emitted than the equation/reaction is balanced.

    I know this because the nuclear reaction requires a breakdown of any element and also the release of particles that are radioactive. In which this process can occur instinctively.

    17. Nuclear fusion is a reaction which 2 or more atomic nuclei have been combined to form 1 or more atomic nuclei or subatomic particles. A nuclear reaction equation is a portrayal of the change that is happening while one nucleus is being converted to another. I know that nuclear fusion is happening when two or more nuclei have combined together. I would identify a nuclear fusion when two atoms combine to form a large nucleus and a great amount of energy is being produced.

    18. In beta-minus decay the atomic number is being increased by 1. The student's error is that it is decreasing by 1. So, the equation models beta-plus.

    Again idk if these are correct but I will post when I get them graded (^_-)db(-_^)

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  4. Yarielis is correct

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  5. is she actually right?

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  6. My teachers are busy with state testing happening, so I haven't gotten my feedback on those essays sorry...

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  7. Ok, I got my feedback back

    For 16 I put: Because the alpha particle was emitted than the equation/reaction is balanced.
    I know this because the nuclear reaction requires a breakdown of any element and also the release of particles that are radioactive. In which this process can occur instinctively. (My teacher told me that I didn't have sufficient reason to explain)

    For 17 I put: Nuclear fusion is a reaction which 2 or more atomic nuclei have been combined to form 1 or more atomic nuclei or subatomic particles. A nuclear reaction equation is a portrayal of the change that is happening while one nucleus is being converted to another. I know that nuclear fusion is happening when two or more nuclei have combined together. I would identify a nuclear fusion when two atoms combine to form a large nucleus and a great amount of energy is being produced. (My teacher she put incorrect and then put "Nuclear fusion is a reaction which 2 or more atomic nuclei have been combined to form 1 or more atomic nuclei or subatomic particles")

    For 18 I put: In beta-minus decay the atomic number is being increased by 1. The student's error is that it is decreasing by 1. So, the equation models beta-plus. (She gave me full credit)

    Hope this helped sorry for the late answer...

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