Chemical Equations
This reaction occurs when a single compound breaks down into two or more simpler substances (elements or compounds)
Decomposition
What type of reaction is 2KClO3 --->2KCl + 3O2
Decomposition
What type of reaction is Pb(NO3)2 + 2KI--->PbI + 2KNO3
Double displacement
Which reactions are those in which the ions in two ionic compounds are interchanged. At least one of the resulting products must form a precipitate, water, or a gas
Double-displacement
Balance this equation: Fe + CuNO3 ----> Fe(NO3)2 + Cu
Fe + 2 CuNO3 - > Fe(NO3)2+ 2 Cu
_____ never have a subscript or a charge
Metals
Can you ever change a subscript when balance equations?
No
Do atoms have subscripts?
No
Are atoms created or destroyed during a chemical change/reaction? explain
No Because of the Law of Conservation of Matter
What type of reaction is Fe + CuSO4e --->FeSO4 + Cu
Single Displacement
What type of reaction is this: Zn + H2SO4 ---> ZnSO4 + H2?
Single Displacement
Which reaction occurs when a single element takes the place of another element in a compound.
Single-Displacement
What type of reaction is 2Na + Cl2 --->2NaCl
Synthesis
What type of reaction is this: 2 Al + 3 Br2 ---> 2 AlBr3?
Synthesis
What are five major categories of chemical reactions?
Synthesis Decomposition Single Displacement Double-displacement Combustion
ALL CHEMICAL EQUATIONS MUST SATISFY THE LAW OF CONSERVATION OF MASS. T/F
T
When writing the formula for a covalent compound, do NOT criss-cross. Just follow the prefixes mono, di, tri, etc. T/F
T
What does happen to the atoms in a chemical change/reaction?
The bonds between atoms are created and/or destroyed. When sodium reacts with chlorine to make salt, sodium bonds with chlorine to make sodium chloride.
What happens to the properties of the atoms when a chemical change/reaction occurs?
The properties are completely changed!
Balance zinc + lead(II) nitrate yields zinc nitrate + lead
Zn + Pb(NO3)2 --->indicator Zn(NO3)2 + Pb
Does the symbol, "K" represent an atom, a molecule, or a formula unit?
atom
How do we balance equations?
by adding coefficients to an equation.
Chemical reactions are represented with ____ ____
chemical equations.
What are the numbers in front of a chemical formula called
coefficients
Does the symbol, "MgBr2" represent an atom, a molecule, or a formula unit?
formula unit
______ represent ionic compounds.
formula units
Does the symbol, "F2" represent an atom, a molecule, or a formula unit?
molecule
Does the symbol, "SO2" represent an atom, a molecule, or a formula unit?
molecule
_____ have subscripts
moleucles
What are some Indicators of chemical change
new substance color change formation of a gas heat/light produced formation of a precipitate
The ____are everything on the right side of the arrow.
products
The _____are everything on the left side of the arrow in a chemical equation.
reactants
Describe synthesis reaction
two substances (elements or compounds) combine to form a single more complex product.
The arrow is called the ____sign.
yields
Balance this equation: C2H5OH + O2--->CO2 + H2O
C2H5OH + 3 O2 --> 2 CO2 + 3 H2O
2C2H2 + 5O2 --->4CO2 + 2H2O
Combustion
What occurs when a substance rapidly combines with oxygen to form one or more oxides, such as when wood or gas is burned to form carbon dioxide and water.
Combustion
potassium chlorate when heated yields potassium chloride + oxygen gas
2KClO3 --->2KCl + 3O2
sodium phosphate + calcium chloride yields calcium phosphate + sodium chloride
2Na3PO4 + 3CaCl2---> Ca3(PO4)2 + 6NaCl
Balance this equation: Al + Cl2 equation image indicator AlCl3
2 Al + 3 Cl2 --> 2 AlCl3
Balance the following equation: NaOH + CaBr2 --->Ca(OH)2 + NaBr
2 NaOH + CaBr2 --->Ca(OH)2 + 2 NaBr.
Describe in words what this equation means: 2AlCl3 --->2Al + 3Cl2.
2 formula units of aluminum chloride break down into 2 atoms of aluminum and 3 molecules of chlorine
Describe in words what this equation means: 2H2 + O2 ---> 2H2O.
2 molecules of hydrogen react with 1 molecule of oxygen to make 2 molecules of water.
aluminum bromide + chlorine yields aluminum chloride + bromine
2AlBr3 + 3Cl2 --->2AlCl3 + 3Br2
