Nuclear #1

iHub - Nuclear Review #1

Unit Goals, Chain Reactions, Nucleus, Energy

Multiple Choice

What is our unit question?

• What is U-235, and what does it do?

• Is a nuclear reaction the same as a combustion reaction?

• How can a small amount of nuclear fuel destroy a city?

• What is the chemistry of nuclear reactions?

Multiple Choice

What is the difference between these two atoms?

• They are both Uranium atoms.

• U-235 has fewer neutrons, so it is less stable and will split.

• U-238 has fewer neutrons, so it is less table and will split

• U-238 has the same amount of protons ans U-235

Multiple Choice

What is this picture representing?

• A nuclear chain reaction

• The tiny yellow dots are neutrons

• One U-235 atom will split many time.

• One U-235 atom will split, making 3 neutrons

Multiple Choice

In this picture, the bottom numbers represent _?

• The mass of that particle

• The mass of uranium

• The number of protons for uranium

• The number of protons for different particles.

Multiple Choice

If a nuclear reaction releases 3.2x10-11 J of energy for every U-235 atom that splits, how much energy is released when 1,000,000 U-235 atoms split.

• 3.2 x 10^{- 5} J

• 3,200,000 J

• 1,000,000 J

• 5.8x 10^-11 J

Multiple Choice

How many atoms are in 1 mole of U-235?

• 235 atoms

• 6.02x10²³ atoms

• 3.2x10^-11 atoms

• 92 atoms

Multiple Choice

If there are 6.02x10²³ atoms in 1 mole of U-235, and 3.2x10^-11 J of energy is released per atom, how much energy is released in 1 mole of U-235?

• 3.2x10^-23 J

• 1.92x10³⁴ J

• 3.2x10²³ J

• 1.926 x 10¹³ J

Multiple Choice

How many moles of U-235 are in 64,000 grams of U-235?

• 64,000 grams

• 235 grams

• 272.3 moles

• 272.3 grams

Multiple Choice

What is an isotope?

• The same atom with different numbers of neutrons.

• The same neutrons, with the same number of protons.

• Where are three particples, neutrons, protons and electrons are different.

• The same number or protons, which different numbers of electrons.

Multiple Choice

What is the role of a neutron?

• stabilize the whole atom.

• make the nucleus of an atom split.

• stablize the nucleus of the atom because of the appropriate ratio of P's to N's.

• stablize the nucleus of the atom because of the appropriate ratio of P's to E's.

Fill in the Blank

The nucleus of an atom is held together because of the _, which keeps the positive protons from repelling.

Fill in the Blank

For the strong nuclear force to work, the protons inside the nucleus must be _.

Fill in the Blank

For small atoms, the ratio of P's to N's in a stable atom is _.