chemistry
What is a Atom.
Atoms make up all matter. They contain Neutrons, Protons and electrons.
What is The Periodic Table.
This is a chart which organizes the chemical elements
Balance H Cl
HCl
Balance - H + Cl gives HCl
already balanced
What is a Exothermic Reaction?
A reaction which releases heat, light or sound.
what is a molecule.
A combination of two or more atoms.
What is The Atomic Number.
Number of protons in the Nucleus.
Balance Magnesium Oxide
MgO
Fe + Cl2 = FeCl3
2 Fe + 3 Cl2 = 2 FeCl3
What is a Endothermic Reaction?
A reaction where energy in the form of heat is absorbed making it colder.
What is an electron Shell?
Rings that contain electrons that form around the Nucleus.
What is The Atomic Mass.
The sum of the number of Protons plus Neutrons in the Nucleus.
Balance Potassium Nitrate
KNO3
KBrO → KBr + KBrO2
2KBrO → KBr + KBrO2
What type of reaction uses O2 as a reactant?
Combustion
What is the Equation for maximum number of electrons per shell?
2n2 where n = shell number
What is a Group
Columns or multiple columns in the periodic table.
What is a Period?
Rows in the periodic table. Each element has the same number of electron shells.
CrH6 → Cr + H2
CrH6 → Cr + 3H2
What reaction breaks apart a single reactant to form several products? Give an example
Decomposition. XY gives X + Y
What determines an element?
Number of Protons.
What are Alkaline Earth Metals.
Beryllium, Magnesium, Calcium, Strontium, Barium, Radium.
Balance Calcium Hydroxide
Ca(OH)2
CH4 + O2 → CO2 + H2O
CH4 + 2O2 → CO2 + 2H2O
What reaction - When 2 reactants form 1 product? Give an example.
Combination Reactions. H2 + Cl2 gives 2HCl