Spectroscopy is used to determine:

• Concentrations of solutions

• Size of particles in liquids

• Absorption, emission, and/or scattering of light

• How acidic or basic a solution is

A solution with a pH of 12 is Basic

• true

• false

The law of conservation of mass states that:

• The number of atoms on each side needs to be the same

• Matter can not be created nor destroyed, only converted

• The number of protons must be the same to be the same element

• Protons and neutrons are in the nucleus and electrons in the shells around

How many electrons can the first shell hold?

• 8

• 16

• 12

• 2

the number of protons in an atom is equal to:

• The atomic mass

• The number of electrons

• The number of neutrons

• The mass of the atom

Neutrons have a _____________ charge:

• 0

• 1+

• 1-

• unknown

How many electrons can the second shell hold?

• 12

• 8

• 4

• 16

Exothermic reactions produce

• Salt

• Cold

• Water

• Heat

When an atom has gained or lost electrons it becomes an:

• Radioactive

• Ion

• Proton

• Isotope

The half Life of Cobalt-60 is

• 1 year

• 50%

• 5.27 years

• 5 grams