Answers SS - TX - Chemistry BUnit Test

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Consider the nuclear equation below.What is X?

Superscript 235 subscript 96 upper C m.

Superscript 243 subscript 92 upper U.

Superscript 235 subscript 92 upper U.

Superscript 243 subscript 96 upper C m.

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The symbol for a radioactive nuclide is . Which statement is correct?

The atomic number of the radioactive nuclide is 210.

The mass number of the radioactive nuclide is 294.

The number of neutrons present in the nucleus of each atom is 126.

The number of protons present in the nucleus of each atom is 210.

An isotope undergoes radioactive decay by emitting radiation that has no mass. What other characteristic does the radiation have?

some shielding required

positive or negative charge

low penetrating power

no charge

A target is shielded from a radioactive sample by a sheet of metal. What kind of radiation can pass through the sheet of metal and hit the target?

gamma rays only

gamma rays and beta particles

beta particles only

beta particles and alpha particles

A fusion reaction takes place between carbon and another element. Neutrons are released, and a different element is formed. The different element is

lighter than helium.

heavier than helium.

used for energy on Earth.

radioactive.

Which best describes a chain reaction associated with a nuclear reaction?

Neutrons released during a fusion reaction cause other nuclei to fuse.

Neutrons released during a fission reaction cause other nuclei to split.

Helium nuclei released during a fission reaction cause other nuclei to split.

Helium nuclei released during a fusion reaction cause other nuclei to fuse.

Examine the nuclear reaction: . Why is this classified as a nuclear reaction rather than a chemical reaction?

It is not balanced.

A new compound is formed.

A change has occurred in a nucleus.

A new element has been formed.

A radioactive nuclide has 53 protons and 78 neutrons. Which is the symbol of this nuclide?

Superscript 53 subscript 78 upper I.

Superscript 78 subscript 53 upper P t.

Superscript 131 subscript 78 upper P t.

Superscript 131 subscript 53 upper I.

Which type of reaction does this diagram represent?

nuclear fission because an atom is splitting into two fragments

nuclear fusion because the products that are produced are radioactive

nuclear fission because a large amount of energy is being released

nuclear fusion because atomic nuclei combine to form a heavier nucleus

Which represents a balanced nuclear equation?

Superscript 23 subscript 11 upper N a right arrow superscript 24 subscript 12 upper M g plus superscript 1 subscript 1 upper H.

Superscript 24 subscript 11 upper N a right arrow superscript 24 subscript 12 upper M g plus superscript 0 subscript negative1 e.

Superscript 24 subscript 11 upper A l right arrow superscript 24 subscript 12 upper M g plus superscript 0 subscript negative 1 e.

Superscript 23 subscript 12 upper M g right arrow superscript 24 subscript 12 upper M g plus superscript 1 subscript 0 e.

Consider the incomplete equation below If this equation was completed, which statement would it best support?

Nuclear fusion produces elements that are heavier than helium.

Nuclear fusion produces elements that are lighter than helium.

Nuclear fission produces elements that are heavier than helium.

Nuclear fission produces elements that are lighter than helium.

What part of an atom is involved in a chemical reaction?

proton

neutron

nucleus

electron

Consider the nuclear equation below.What is the nuclide symbol of X?

Superscript 231 subscript 94 upper P u.

Superscript 235 subscript 90 upper T h.

Superscript 239 subscript 94 upper P u.

Superscript 231 subscript 90 upper T h.

The symbol for a radioactive nuclide is . Which statement is correct?

The atomic number of the radioactive nuclide is 90.

The mass number of the radioactive nuclide is 144.

The number of neutrons that are present in the nucleus of each atom is 324.

The number of protons that are present in the nucleus of each atom is 234.

Why is it important for scientists to replicate each other’s experiments?

to determine if important scientific results are repeatable

to help the research of other scientists

to determine if slight alterations in the experiment can affect the result

to further their own research

Both nuclear fusion and nuclear fission reactions

release radioactive waste.

involve the splitting of atoms.

are utilized in nuclear power plants.

release large amounts of energy.

Consider the nuclear equation below.Which correctly identifies the type of reaction?

alpha decay

beta plus decay

beta minus decay

gamma decay

What is the most penetrating kind of radiation product that can be shielded with aluminum foil?

alpha particles

beta particles

gamma rays

high-energy photons

What type of particle has no mass or charge?

Alpha

Beta

Gamma

Proton

Consider the nuclear equation below.What is the nuclide symbol of X?

Superscript 230 subscript 90 upper T h.

Superscript 229 subscript 89 upper A c.

Superscript 228 subscript 90 upper T h.

Superscript 238 subscript 88 upper R a.

Which best describes nuclear fission?

A nucleus spontaneously splits and absorbs energy.

Two nuclei spontaneously combine and absorb energy.

A nucleus collides with a neutron and splits, releasing energy.

Nuclei combine to form a heavier nucleus, releasing energy.

A scientist notices that a lump of niobium is warm to the touch and wonders if nuclear reactions are taking place in the metal. How can she find out?

Measure the metal’s temperature.

Check for the presence of alpha, beta, and gamma particles.

Look for the presence of niobium compounds.

Place the niobium in a pressurized container, and see if the lump becomes warmer.

Which element is nuclear fusion least likely to produce?

hydrogen, which has an approximate mass of 1

chlorine, which has an approximate mass of 35

argon, which has an approximate mass of 39

silicon, which has an approximate mass of 28

Which type of reaction does this diagram represent?

nuclear fusion because nuclei combine to form a heavy nucleus

nuclear fission because an atom is splitting into two large fragments of comparable mass

nuclear fusion because a large amount of energy is being released

nuclear fission because the resulting products are not radioactive

A radioactive nuclide is used to detect eye tumors. An atom of this radionuclide contains 15 protons, 15 electrons, and 17 neutrons. Which is symbol of this radionuclide?

Superscript 32 subscript 17 upper P

Superscript 17 subscript 15 upper P.

Superscript 30 subscript 15 upper P.

Superscript 32 subscript 15 upper P.

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