Nuclear Chemistry

How many half-lives are required for 3/4 of the nuclei of one isotope in a sample to decay?

• 3/4

• 3/2

• 2

• 3

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NGSS.HS-PS1-8

Gamma rays are

• electrons

• helium nuclei

• electromagnetic waves

• neutrons

Tags

NGSS.HS-PS4-3

NGSS.HS-PS4-4

To use radioactive dating for a substance, you must know the substance's

• melting point

• half-life

• rate of weathering or erosion

• enthalpy of reaction

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NGSS.HS-PS1-8

What does the 4 in the alpha particle represent?

• the mass number

• the atomic number

• the number of protons

• the number of neutrons

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NGSS.HS-PS1-8

Alpha particles are

• electrons

• helium nuclei

• electromagnetic waves

• neutrons

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NGSS.HS-PS1-8

During radioactive decay, the nucleus disintegrates into

• a lighter and more stable nucleus

• a heavier and more stable nucleus

• a lighter and less stable nucleus

• a heavier and less stable nucleus

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NGSS.HS-PS1-8

Which statement is true about half-lives?

• different atoms of the same nuclide have different half-lives

• each radioactive isotope has its own half-life

• all radioactive nuclides of an element have the same half-life

• all radioactive nuclides have the same half-life

Tags

NGSS.HS-PS1-8

Which statement about nuclear reactions is not true?

• nuclear power plants use fission of uranium

• in fission, nuclei are combined, and in fusion, nuclei are split

• in fission, nuclei are split, and in fusion, nuclei are combined

• heat and light in the sung are produced by fusion reactions

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NGSS.HS-PS1-8

Which of the following is a fusion reaction?

• uranium-235 absorbing a nuetron and splitting into xenon-140, strontium-95, and two neutrons

• hydrochloric acid combining with sodium hydroxide to form NaCl and water.

• carbon-14 decaying into nitrogen-14 and a beta particle

• curium-246 combining with carbon-12 to form nobelium-254 and four neutrons

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NGSS.HS-PS1-8

The energy released in a nuclear reaction comes from

• electrons

• bonds

• positrons

• the binding energy of the nucleus

Tags

NGSS.HS-ESS1-1

NGSS.HS-PS1-8