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  1. In any nuclear reaction, nuclei are transformed in some way.

True

False

  1. Two fissionable substances commonly used in nuclear reactors and nuclear weapons include uranium-235 and plutonium-239.

True

False

  1. Fission reactions can be controlled; thus, they are used to create energy and electricity. But fusion reactions are uncontrollable and require too much energy for economical use.

True

False

  1. Fission reactions occur at such high temperatures in the Sun that the Sun appears to glow.

True

False

Verified Answer :

MissPhiladelphia

1. In any nuclear reaction, nuclei are transformed in some way.

True

2. Two fissionable substances commonly used in nuclear reactors and nuclear weapons include uranium-235 and plutonium-239.

True

3. Fission reactions can be controlled; thus, they are used to create energy and electricity. But fusion reactions are uncontrollable and require too much energy for economical use.

True

4. Fission reactions occur at such high temperatures in the Sun that the Sun appears to glow.

False

Hope this answers the question. Have a nice day.

Answer:

1. True

2. true

3. True

4. False

Explanation:

1. In nuclear reaction, the nuclie are transformed to produce a large amount of energy. In fission reaction, one large nucleus breaks to form two small nucleus and produce energy. In fusion reaction,two nucleus combine to form a single large nucleus.

2. Uranium 235 used in nuclear reaction absorbs neutrons and form two smaller nucleus to produce  large amount of energy.

              Plutonium-239 also absorb neutrons and also fission with uranium-235 in a reactor.

3. Fusion reaction is uncontrollable. It occurs in the sun. It is a chain reaction which produce more and more energy along with neutrons. So it is uncontrollable.

Whereas , Fission reaction is controllable by using controlled rods.

4. Fusion reaction occurs at the sun to produce high temperature and energy and the sun glows.