Chemical Equations

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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


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