ELEMENTS AND THE PERIODIC TABLE
Why do swimming pools smell?
chlorine mixes with the sweat, urine to cause odor
What type of reaction is it when two different elements combine together chemically?
Synthesis Reaction
What is nucleus?
The center of an atom
In a balanced chemical equation, the number of atoms on each side must be ______.
Na + Cl2----> NaCl
2Na + Cl2----> 2NaCl
What is equal?
_N2 + _H2 ----> _NH3
N2 + 2H2 ----> 2NH3
What gas takes up 78% of the atmosphere?
Nitrogen
What metal is soft in it's regular form?
gold
What happens when on compound breaks down into two separate elements? What do you usually need for this to happen?
Decomposition Reaction
Energy
What are protons?
part of the atom's nucleus with a positive charge
Balance this equation:
H2 + O2 ----> H2O
What is:
2H2 + O2----> 2H2O
Who is the "Father of the Periodic Table".
Dmitri Mendeleev?
What element is found in your toothpaste (and Canadian water) to make your teeth stronger?
Fluorine
What do you call a reaction when one element replaces another element in a compound?
What is a molecule?
(usually)Two or more atoms chemically bonded together.
The process of balancing equations follows this law of chemistry.
What is the law of conservation of mass?
The only metal that is liquid at room temperature.
What is mercury?
What do you call a column in the periodic table?
group or family
What do you call a reaction when two pairs of compounds change partners?
Double Replacement
What is the subatomic particle with the smallest mass?
electron
Balance this equation:
Fe + O2 ---> Fe2O3
What is:
4Fe + 3O2 ---> 2Fe2O3
What type of reaction is burning gasoline for your cars to work?
Combustion
What do you call a row in the periodic table?
period
Combustion Reaction
What is the difference between an atom, molecule, and a compound?
Atom is the smallest unit of matter.
When 2 or more atoms bond together, it's 1 molecule.
When 2 or more different elements bond together, it's a compound.
Balance this equation:
C3H8 + O2 ---> CO2 + H2O
C3H8 + 5O2 ---> 3CO2 + 4H2O
What happens to the nucleus in an atomic bomb?
It is split open (nuclear fission)