Combustion, Heat & Energy
Exothermic
The release of heat
What are the subatomic particles?
Protons, neutrons and electrons.
How many groups are there in the periodic table?
18 groups
What are covalent bonds?
Nonmetals with nonmetals
True or false: you criss cross the subscripts when the charges are different?
True
Where mass cannot be created or destroyed
The Law of Conservation of Mass
What happens if an electron gains energy in an orbit?
It can jump to a higher energy orbit.
Where are the alkali metals?
Group 1
What do you need to show for a chemical formula?
Element symbol and number of each element
What are two or more elements named when bonded together?
A compound.
What is the difference between potential and kinetic energy?
Potential energy is stored energy while kinetic energy is energy in motion.
What does the Bohr Model represent?
An atom as the nucleus that has protons and neutrons and electrons in the circular orbitals.
The outer shell of an atom.
True or false: are polyatomic ions a group of atoms that have a negative charge?
False
What are polyatomic ions?
Group of atoms covalently bonded together
What is combustion, what does it occur with and what does it produce?
Combustion is a chemical reaction that occurs with oxygen. It produces energy in form of heat and light.
When a gasesous element absorbs energy what become excited and what can it emit?
Electrons become excited. When electrons release energy, the atom can emit light.
Name two Nonmetals
Oxygen and Carbon
What is the octet rule?
An atom that will form bonds (lose or gain e-) until it has 8 e- in the valence of each atom.
When writing ionic formulas what is your first step?
Write cation (or metal)
How is energy transferred and what is the source within our earth system of geothermal energy?
Define atomic emission spectra
The pattern formed when light emitted by an element is separated into the the different wavelengths it contains.
What is a metalliod?
Elements that fall in between metal and nonmetal categories
What is ionic bonding?
When a metal transfers one or more electrons to a nonmetal in an effort to attain a stable octet of electrons.
What is the term for three elements?
Ternary