1. 2. 3. 1. What is a chemical formula? 2. View examples of chemical formulas. 3. What is a...
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Transcript of 1. 2. 3. 1. What is a chemical formula? 2. View examples of chemical formulas. 3. What is a...
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Balance1.
2.
3.
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1. What is a chemical formula?2. View examples of chemical formulas.3. What is a coefficient?4. What is a subscript?5. Differentiate between a subscript and a coefficient in
a chemical formula.6. Identify reactants and products in a chemical
equation?7. Identify and count the number of atoms in a chemical
equation.8. Define the law of conservation of mass.9. Observe examples balanced chemical equations.10. Balance chemical equations.
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What are chemical symbols?
Chemical symbols are representations of elements on the periodic table.
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What are chemical formulas?
A chemical formula shows the elements that make up the
compound and the number of atoms of each element in that compound.
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Examples of chemical formulas.
CO2
H2O
CO
H3ONaCl
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H2O
H is the symbol for Hydrogen
O is the symbol for Oxygen
The subscript means the molecule of water has two atoms of hydrogen
No subscript after oxygen means the molecule of water has only one atom of oxygen.
Chemical Formula
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Coefficient
H2O3
Molecule of Water
The coefficient shows the number of molecules of the compound.
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Coefficient & Subscript
Identify the coefficient and or subscript.
CO2
H2O
2MgO2 2KOH
3AgNO32AgNO3
1.
2.
3.
4.
5.
6.
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What is a chemical equation?
A chemical equation is a representation of a chemical reaction on paper.
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Examples of chemical equations.
2H2 + O2 2H2O
CaO + H2O Ca(OH)2
C + O2 CO2
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Reactants & Products
Chemical equations area split up into two parts:
Reactants-the starting materials on the left side of the arrow
Products-the new substance or substances produced on the right side of the arrow.
Reactants Products
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Parts of a Chemical Equation
C+O2 CO2
REACTANTS are the starting
materials on the left side of
the arrow.
PRODUCT is the new
substance or substances
produced and are on the right
side of the arrow.
yieldsor
produces
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Reactants & Products
Identify the reactants and products.
1. CH4 + O2 CO2 + 2H2O
2. 3H2 + N2 2NH3
3. 2H2 + O2 2H2O
4. CaO + H2O Ca(OH)2
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Count the atoms
Count the number of atoms in the chemical equation.
C + O2 CO2
How many carbon (C) atoms on each side?
How many oxygen (O) atoms on each side?
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Count the atoms
Count the number of atoms in the chemical equation.
3H2 + N2 2NH3
How many hydrogen (H) atoms on each side?
How many Nitrogen (N) atoms on each side?
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Count the atoms
Count the number of atoms in the chemical equation.
2H2 + O2 2H2O
How many hydrogen (H) atoms on each side?
How many carbon (C) atoms on each side?
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Count the atoms
Count the number of atoms in the chemical equation.
2Mg + O2 2MgO
How many magnesium (Mg) atoms on each side?
How many oxygen (O) atoms on each side?
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Count the atoms
Identify and count the number of atoms in the chemical equations.
1. CH4 + 2O2 CO2 + 2H2O
2. 4Al + 3O2 2Al2O3
3. 2K + 2H2O 2KOH + H2
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ALL CHEMICAL EQUATIONS MUST BE BALANCED ! ! !
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Law of Conservation of Mass
Mass (atoms) cannot be created nor destroyed in a chemical reaction.
What does that mean for us?
There must be the same number and kinds of atoms on each side of the chemical equation.
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10 atoms of O
P P4O10O2+4 5
4 atoms of P 4 atoms of P
10 atoms of O
=
balanced
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H + O2 H2OH =1 atom
O =2 atoms
H =2 atoms
O =1 atom
=
H + O2 H2O2
O =2 atomsO =2 atoms
H =4 atoms
4H =4 atom =
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Mg + O2 MgO
Mg = Mg =
O = O =
11
2 1
2
2
2
2
2
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Ca + O2 CaO
Ca = Ca =
O = O =
11
2 1
2
2
2
2
2
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N2 + H2 NH3
N = N =
H = H =
12
2 3
2
6
2
3
6
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Cu2O + C Cu+ CO2
Cu = Cu =
O = O =
C = C =
12
1 2
4
2
4 4
2
1 1
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H2O2 H2O + O2
H = H =
O = O =
22
2 3
2
4
4
2
4
4
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Balance the equations
1. Mg + O2 MgO
2. H2 + N2 NH3
3. CH4 + O2 CO2+
H20
? ?
? ?
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