Download presentation
Presentation is loading. Please wait.
Published byAudra Mae Payne Modified over 6 years ago
1
Chemical Formulas Coefficient Subscript #of molecules 5CO2 #of atoms
2
Chemical Reactions- takes place when chemical bonds between atoms are broken and new bonds form. There are the same number of total atoms of each element at the end.
3
Chemical Equations- Ex) Na + Cl NaCl reactants products
Reactants - the chemicals to be combined (left of the arrow) Products - Results of the combinations (right of the arrow) Ex) Na + Cl NaCl reactants products
4
3 Rules to Balancing Equations
1. Check to make sure all formulas are written correctly. 2. Do NOT change subscripts in formulas. Only change coefficients.
5
A coefficient of 2 must be placed in front of Na to be balanced!
Coefficients- Numbers placed in front of a formula to make the number of atoms on each side of the equation equal. Ex) Na + Cl NaCl Na is NOT equal! A coefficient of 2 must be placed in front of Na to be balanced! 2Na + Cl NaCl
6
Count atoms, then begin with an element that only occurs once on each side of an equation.
Ex. A) H H2O Which element is not equal? 1. H2 +O H O = H ≠ 2H2 + O H2O balanced!
7
Ex. B) Na + 2H20 NaOH + H2 Which element is not equal?
Coefficient of 2 added to NaOH Na + 2H NaOH + H O= H= Na ≠ 2Na + 2H NaOH + H2
8
4 Types of Chemical Reactions
Synthesis Reaction Reaction in which two or more substances combine to forms a compound. Sodium + Chloride Salt 2Na + Cl NaCl
9
Decomposition Reaction
Compound breaks into two or more substances. 2HgO Hg + O2
10
Single Replacement Reaction
One element replaces another element in a compound to form a new compound Fe + CuSO FeSO4 + Cu
11
Double Replacement Reaction
Occurs when two compounds in a reaction exchange atoms AgNO3 + NaCl AgCl + NaNO3
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.