Chemical Reactions, Formulas, and Equations
Chemical Reactions, Formulas,
and Equations
Chemical Formulas
Chemical formula
- A shorthand notation for a
compound or diatomic element.
•
Shows the elements and how many atoms of
each element are in the compound/molecule.
C
6
H
12
O
6
Element Symbols
Subscripts
Subscripts
–
Number written
below and to the right of a
chemical symbol.
•
Shows the number of atoms
of each element.
Signs of a Chemical Reaction
Clues to chemical reaction
1.
Gas Formation
2.
Precipitate
3.
Color Change
4.
Energy Change
5.
Sound
6.
Light
7.
Odor
Chemical Reactions
Chemical reaction
– a process by which one or
more substances undergo a chemical change
(React) to produce one or more different (New)
substances.
•
New substances form because chemical bonds
break and form new bonds.
•
Different
_________
and
________
properties
•
Chemical Reactions are shown by writing
chemical equations.
Physical
Chemical
Chemical Equations and Parts
Chemical Equation
–
A representation of a chemical
reaction where the reactants and products are expressed
in formulas
Reactants
- Starting materials that change
Products
– New substances formed “Ending Materials”
_______________ produce the _________________.
Coefficients
–
Number placed in front of a formula to
balance equations.
REACTANTS
2H
2
+ O
2
2H
2
O
PRODUCTS
Yields
Reactants
Products
Coefficients
Explore the world of chemical reactions, formulas, and equations with insights into signs of reactions, chemical structure representation, and the balance of reactants and products in equations. Learn about how new substances are formed and the role of coefficients in balancing equations.
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Presentation Transcript
Chemical Reactions, Formulas, and Equations
Chemical Formulas Element Symbols Subscripts Number written below and to the right of a chemical symbol. Shows the number of atoms of each element. C6 H12O6 Subscripts Chemical formula - A shorthand notation for a compound or diatomic element. Shows the elements and how many atoms of each element are in the compound/molecule.
Signs of a Chemical Reaction Clues to chemical reaction 1. Gas Formation 2. Precipitate 3. Color Change 4. Energy Change 5. Sound 6. Light 7. Odor
Chemical Reactions Chemical reaction a process by which one or more substances undergo a chemical change (React) to produce one or more different (New) substances. New substances form because chemical bonds break and form new bonds. Different _________ and ________ properties Physical Chemical Chemical Reactions are shown by writing chemical equations.
Chemical Equations and Parts REACTANTS 2H2 + O2 PRODUCTS Yields 2H2O Coefficients Chemical Equation A representation of a chemical reaction where the reactants and products are expressed in formulas Reactants - Starting materials that change Products New substances formed Ending Materials _______________ produce the _________________. Coefficients Number placed in front of a formula to balance equations. Reactants Products
