1)A certain radioactive atom has 90 protons and 142 neutrons. If this atom undergoes alpha decay, what is the mass number of the daughter atom?

The mass number of the daughter atom is __________

2)Which statements correctly describe the process of nuclear fusion?

It happens only to large atoms.
It occurs naturally in the Sun.
It releases a large amount of energy.
It bonds atoms together to create molecules.
It involves the joining of two atomic nuclei.

3)How does a nuclear reactor produce electricity?

A.
High-energy gamma rays are converted by a generator into electricity.
B.
The heat from the reaction turns water to steam, which runs a generator.
C.
The reaction produces a stream of electrons that flow through wires and into batteries.
D.
The heat released from the reaction is used to burn coal or gas to produce electricity.
E.
Control rods absorb the neutrons emitted and release a stream of electrons as electricity.

4)What are some applications of fission reactions?

as a zero-waste energy source
for generating large amounts of heat
for creating stable elements from unstable ones
for creating new, heavier elements
as the energy source in nuclear weapons

5)Which statement best describes the function of enzymes?

A.
Enzymes aid biological reactions by providing more reactants.
B.
Enzymes aid biological reactions by removing products quickly.
C.
Enzymes raise the temperature in a cell to speed up biological reactions.
D.
Enzymes reduce the activation energies of biological reactions.
E.
Enzymes reduce the energy of products in biological reactions.