Unit 1 Matter, Atoms and Nuclear

Which phase describes a risk associated with producing energy in a nuclear power plant?

• production of wastes that cool surrounding water supplies

• depletion of atmospheric carbon dioxide

• production of wastes that need long term storage

• depletion of atmospheric hydrogen

Which two substances are most commonly used for shielding in a nuclear reactor?

• water and heavy water

• steel and high density concrete

• sand and graphite

• molten sodium and molten lithium

What do you observe when you add oil to water?

• The oil will float because its density is less than the density of water

• The oil will float because its density is greater than water

• The oil will sink because its density is less than water

• The oil will sink because its density is greater than water

How many significant figures in .0023

• 2

• 3

• 4

• 5

How many significant figures in 1,000

• 1

• 2

• 3

• 4

How many significant figures in 1,203.22

• 3

• 4

• 5

• 6

What does the number of protons in an element always tell us

• the number of neutrons

• the atomic mass

• the element

• the number of electrons

Beta particles is

• a helium nucleus

• high energy radiation

• high speed electron

When a neutron is absorbed by a nucleus, causing it to fragment into smaller pieces, which type of nuclear reaction has occurred?

• radioactive decay

• fusion

• fission

Which type of radiation is most dangerous

• alpha

• beta

• gamma