Chemical Equations • General form: Reactants Products • For Example: 2Na (s) + Cl 2(g) 2NaCl (s) Subscripts - based on the nature of the chemical Coefficie nts - from the balanced reaction State Indicators s (solid), l (liquid), g (gas), aq (aqueous)
Chemical Equations. General form: Reactants Products For Example: 2Na (s) + Cl 2(g) 2NaCl (s). State Indicators s (solid), l (liquid), g (gas), aq (aqueous). Coefficients - from the balanced reaction. Subscripts - based on the nature of the chemical. Some Vocabulary:. - PowerPoint PPT Presentation
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Chemical Equations
• General form:
Reactants Products
• For Example:
2Na(s) + Cl2(g) 2NaCl(s)
Subscripts
- based on the nature of the chemical
Coefficients
- from the balanced reaction
State Indicators
s (solid), l (liquid),
g (gas), aq (aqueous)
Some Vocabulary:• System:
– The part of the universe being studied
• Open System:– A system where things (mass, energy) can enter and leave.
• Think beaker on a hotplate
• Closed System:– A system where NOTHING can enter or leave.
• Think Thermos
The LAW OF CONSERVATION OF…
• The mass at the beginning and the end of a chemical reaction is the same (conserved)
2) ATOMS• The total number and type of atoms in a
closed system does not change during a chemical reaction.
4 Conservation Laws: (all for closed systems)
1) MASS
3) ELECTRICAL CHARGE
• The total electrical charge in a closed system does not change during a chemical reaction.
4) ENERGY• The total energy in a closed system does not
change during a chemical reaction. (The amounts of the various types of energy may change, but the total remains constant.)