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How many particles of substance is contained in any mole?
What is equal to the atomic weight in grams of any element
it's equal to 1 mole of atoms
convert 25.0g of iron to moles if the atomic weight of iron is 44.85
(g of Fe)=(1 mol Fe)/(55.85g Fe)=0.448 mol Fe
What is the percent composition
mass percent of each element in the compound
How do you balance an equation?
•To balance an equation, adjust the number of atoms of each element so that they are the same on each side of the equation.
Coefficients only, not the subscripts
What is placed in front of the substance to balance the equation to indicate the number of units (atoms, molecules, moles, or ions)?
coefficients or whole numbers
Why would a symbol be placed above or below the arrow while balancing an equation?
to show a condition required for reaction (like heat).
(l), (g), (s) on the bottom right of a symbol would indicate
that it is in the physical state of being a liquid, gas, or solid.
symbol meaning and location +
- means plus,
- placed between substances.
- means resonance,
- placed between substances
- means yields
- placed between reactant and product
right half arrow above left pointing half arrow
- placed between reactants and products
- light energy,
- written above arrow
- gas formation
- after formula
- precipitate formation
- written after formula
which side of the balanced equation are reactants and products written?
reactants are on the left, and products are on the right.
Types of chemical equations
- 1) combination (synthesis)
- 2)combustion (analysis)
- 3) decomposition (substitution)
- 4) single displacement (metathesis)
- 5) double displacement (oxidation)
Example of oxidation
Metal and oxygen
Example of single/double displacement reaction
one/+ element in a compound is exchanged with another element in another compound.
example of combustion
Hydrocarbon reacts with oxygen to produce carbon dioxide and water.
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