Chemical Reactions
The type of bonding that occurs when an atom gains or loses electrons
What is ionic bonding?
This is the type of reaction when One element replaces another element in a compound.
What is a simple replacement?
An atom with a + or - charge
What is an ion?
Process where one or more elements or compounds are changed into one or more different substances
What is a chemical reaction?
This is the electron dot diagram of diatomic hydrogen
H-H
Small number to the lower right of an atom that represents the numbers of atoms of that element in the molecules
What is a subscript?
This is the type of reaction where Two or more elements combine to form a new compound.
What is synthesis?
Ionic bonds occur between a _____ and a ____.
What is a metal and a nonmetal?
A compound decomposes into two or more simpler substances.
The new substance(s) in a chemical reaction
What is the product?
Whole number in front of the formula that represents the relative number of moles in that substance
What is a coefficient?
What occurs when an atom shares electrons
What is covalent bonding?
Is this a balanced chemical equation?:
H2 + 2NaCl --> 2HCl + 2Na
What is yes? There are 2 hydrogens, 2 chlorine, and 2 sodium.
In the formula 5CaSO4, this is the number of oxygen atoms.
What is 20?
Covalent bonds occur between two __________.
What are nonmetals?
A substance will combine with oxygen and in the process, give off energy in the form of light and heat.
What is combustion?
The original substance(s) in a chemical reaction
What is the reactant?
These are the five types of chemical reactions
combustion, single replacement, double replacement, synthesis, decomposition
The reaction 2HgO ---> 2Hg + O is an example of this type of reaction.
What is decomposition?
Is this a balanced equation?: 2Na + 2H2O --> 2NaOH + H2
What is yes? There is 2 Sodium, 4 Hydrogen, and 2 Oxygen.
How you know a chemical change has taken place.
What is temp. change, color change, odor change, formation of a precipitate, formation of a gas?
2 rules for balancing equations
What is (any 2 of the following)?
1. You can only add a coefficient in front of a chemical formula
2. You cannot change any subscripts, nor add any subscripts
3. You may not place a coefficient in the ‘middle’ of a chemical formula
4. You must end up with the same number and kinds of atoms on both sides of the equation when you are finished. Count atoms on both sides uponcompletion to check yourself.
Type of reaction when Two ionic compounds exchange ions in solution to form two new compounds.
What is double replacement?
2 properties of ionic compounds
What is (any 2 of the following)?
hard or brittle
very high melting point
conductors when dissolved in water
insulators when solid
This is the electron dot diagram of NH3
Look at the board!