Chapter Two

matter can exist as which of the following states (more than one answer is correct)

The picture is only for amusement

• Solid
• Liquid
• Gas
• Smog

A roller coaster zooming down a hill is using tremendous amounts of kinetic energy. When that energy has enabled it to get to the top of a hill and it is about to go down again, it has a great deal of_____________ energy

What is the type of energy that is the electromagnetic spectrum and that travels in waves?

• Electric Energy

• Mechanical Energy

• Chemical Energy
• Radiant Energy

Which of the following elements, while still important, is not one of the most common in the body?

• Oxygen
• Iron

• Hydrogen
• Carbon

An ion like Na+ or Ca+ has ____ at least one electron

The Atomic Mass number of an element is the sum of the atom's ______________ (more than one answer is correct)

• electrons

• neutrons

• quarks

• protons

What is an isotope?

• Ions that have lost or gained MORE than one electron

• Atoms that have the same number of protons and electrons but vary in the number of neutrons

• A proton without electrons or neutrons

• A neutron without protons or electrons

Which of the following is NOT true of a radioisotope?

• it tends to be unstable

• has no medical usage

• it is the heavy isotope of certain atoms

• it decomposes to more stable isotopes

Which electrons are most likely to interact with other electrons?

• Inner shell electrons
• Outer shell electrons
• Free electrons
• All electrons equally

What is the Rule of Eights?

• The key to chemical reactivity

• Atoms are considered stable when their outer valence shell has eight electrons (or two in shell 1)

• Atoms with 8 electrons in their outer valence shell (or two in shell 1) are considered stable and chemically inert.

• all choices are true