Chemistry, 09.09.2021 18:40 djnkyworld

In a nuclear reaction, which quantity is the same before and after the change?(1 point) the number of alpha particles

the total mass

the types of atoms

the total number of protons
Why does the emission of an alpha particle always result in transmutation?(1 point)

The number of protons in the atom changes.

The protons in the large atom change to neutrons.

The atom is converted to helium.

Energy is released from the nucleus of the atom.
Which phrase describes radioactive decay?(1 point)

the joining of small nuclei into a larger nucleus

the splitting of a large nucleus into smaller nuclei

the triggering of one reaction by the products of another

the spontaneous emission of radiation
Which option would be an appropriate model of nuclear fusion?(1 point)

sewing one piece of fabric to another

mashing two marshmallows together.

adding a drop of water to a glass of water

putting a puzzle together
Which aspect must be taken into consideration when creating a model of radioactive decay?(1 point)

There must not be any particles or energy emitted from the nucleus.

There must be a predictable and reversible change that occurs.

There must be a way for unstable nuclei to become stable nuclei.

There must not be any changes to the element in question.

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

The atoms are bound to each other by electrons in a fusion reaction.

Energy is released in a fusion reaction, but it is absorbed in a chemical reaction.

Atoms come together in a chemical reaction, but they are split in a fusion reaction.

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. When looking at equations like this, how can you identify a reaction as a fission reaction?(1 point)

A nucleus with a large mass will be on the right side, and there will be electrons in the equation.

A nucleus with a large mass will be on the left side, and there will be neutrons in the equation.

A nucleus with a large mass will be on the left side, and there will be electrons in the equation.

A nucleus with a large mass will be on the right side, and there will be neutrons in the equation.

Nuclear Processes Unit Test
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Question
How is fission different from a simple chemical reaction?(1 point)

Protons cause fission reactions, while chemical reactions involve electrons.

Fission reactions run out of control, while chemical reactions are controlled.

Atoms are split into smaller pieces during fission.

Fission can happen with radioactive forms of atoms.

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

An unstable nucleus releases a single positively charged particle.

An unstable nucleus releases an electron.

An unstable nucleus rearranges its particles and releases energy.

An unstable nucleus releases a particle containing two protons and two neutrons.

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

beta-plus decay

gamma decay

beta-minus decay

alpha decay

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

carbon

helium

nitrogen

hydrogen

Which statement best describes alpha decay?(1 point)

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.

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.

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.

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.

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

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.

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.

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.

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.

Answers: 2

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Answers

Answer from: SxloGxd

In alpha decay, shown in Fig. 3-3, the nucleus emits a 4He nucleus, an alpha particle. Alpha decay occurs most often in massive nuclei that have too large a proton to neutron ratio. An alpha particle, with its two protons and two neutrons, is a very stable configuration of particles. Alpha radiation reduces the ratio of protons to neutrons in the parent nucleus, bringing it to a more stable configuration. Many nuclei more massive than lead decay by this method.

Consider the example of 210Po decaying by the emission of an alpha particle. The reaction can be written 210Po Æ 206Pb + 4He. This polonium nucleus has 84 protons and 126 neutrons. The ratio of protons to neutrons is Z/N = 84/126, or 0.667. A 206Pb nucleus has 82 protons and 124 neutrons, which gives a ratio of 82/124, or 0.661. This small change in the Z/N ratio is enough to put the nucleus into a more stable state, and as shown in Fig. 3-4, brings the "daughter" nucleus (decay product) into the region of stable nuclei in the Chart of the Nuclides.

In alpha decay, the atomic number changes, so the original (or parent) atoms and the decay-product (or daughter) atoms are different elements and therefore have different chemical properties.

Upper end of the Chart of the Nuclides

In the alpha decay of a nucleus, the change in binding energy appears as the kinetic energy of the alpha particle and the daughter nucleus. Because this energy must be shared between these two particles, and because the alpha particle and daughter nucleus must have equal and opposite momenta, the emitted alpha particle and recoiling nucleus will each have a well-defined energy after the decay. Because of its smaller mass, most of the kinetic energy goes to the alpha particle.

Answer from: Quest

There is one s orbital, and there are three p orbitals, five d orbitals, and seven f orbitals. thus, the answer is b. do not confuse the number of orbitals in a subshell with the number of electrons the subshell can hold. each orbital can hold two electrons, so the capacity of an nf subshell is 14 electrons.

Answer from: Quest

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3

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

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