Chemical Equations
The rule of the universe that requires us to balance equations.
The Law of Conservation of Mass
The two products of any combustion reactions involving a hydrocarbon are _____ and _____.
CO2 and H2O
Name 2 of the 5 observations you will make to know that a chemical reaction has occurred.
Light is produced, heat is given off or absorbed, gas is produced, a change in color, a precipitate is formed.
The description below is what type of reaction chemical reaction?
Hydrogen peroxide (H2O2) when heated produces H2 gas and O2.
Decomposition
What products formed when C2H2 reacts with O2?
CO2 + H2O
These are numbers put in front compounds to balance chemical equations.
coefficients
Reaction where two or more substances combine to form a single product is known as a ______ reaction.
synthesis
A symbolic representation of a chemical reaction using words or chemical formulas is known as a ____.
chemical equation
The equation shown below is an example of what type of reaction?
CaSO4 + 2K ---> K2SO4 + Ca
Single replacement reaction.
The balanced chemical equation for
Na + Cl2 --> NaCl
2Na + Cl2 --> 2NaCl
Substances that are created from a chemical reaction are known generally as _______.
products
A reaction where a more reactive element changes places with a less reactive element in a compound is called a ________.
single replacement reaction
Elements that can only exist in a 2 atom molecule if not in a compound are called _____.
diatomic atoms/elements
The equation shown below is what type of chemical reaction?
2Na + Cl2 ---> 2NaCl
Synthesis or Combination
N2 + H2 -----> NH3
1N2 + 3H2 -----> 2NH3
The starting substances of a chemical equation found on the left side of the arrow are called _____.
reactants
A reaction where one substance breaks down into two or more products is called a _______ reaction.
decomposition
What type of chemical equation uses formulas and symbols to represent a chemical reaction, but it DOES NOT obey the law of conservation of mass?
skeletal equation
The equation shown below is what type of chemical reaction.
CH4 + 2O2 ---> CO2 + 2H2O
Combustion
What product(s) are formed when magnesium metal (Mg) reacts with oxygen gas (O2)?
MgO
Numbers used to designate the number of atoms or molecules in an element or compound are called _____.
subscripts
Reaction where two like elements in different compounds change places with each other to form two new compounds is known as a _________ reaction.
double replacement
What type of chemical reaction is represented by the following pattern?
A + BC ---> B + AC
single replacement reaction
The equation show below is an example of what type of chemical reaction?
ZnI2 + AlBr3 ---> ZnBr2 + AlI3
Double replacement reaction.
CaCO3 ----> CaO + CO2
1CaCO3 ----> 1CaO + 1CO2