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Balance

Balance. 1. 2. 3. What is a chemical formula? View examples of chemical formulas. What is a coefficient? What is a subscript? Differentiate between a subscript and a coefficient in a chemical formula. Identify reactants and products in a chemical equation?

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Balance

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  1. Balance 1. 2. 3.

  2. What is a chemical formula? • View examples of chemical formulas. • What is a coefficient? • What is a subscript? • Differentiate between a subscript and a coefficient in a chemical formula. • Identify reactants and products in a chemical equation? • Identify and count the number of atoms in a chemical equation. • Define the law of conservation of mass. • Observe examples balanced chemical equations. • Balance chemical equations.

  3. What are chemical symbols? • Chemical symbols are representations of elements on the periodic table.

  4. What are chemical formulas? • A chemical formula showsthe elements that make up the compound and the number of atoms of each element in that compound.

  5. Examples of chemical formulas. CO2 CO H2O NaCl H3O

  6. Chemical Formula His the symbol for Hydrogen Ois the symbol for Oxygen H2O No subscriptafter oxygen means the molecule of water has only one atom of oxygen. Thesubscriptmeans the molecule of water has two atoms of hydrogen

  7. Coefficient Molecule of Water 3 H2O The coefficient shows the number of molecules of the compound.

  8. Coefficient & Subscript Identify the coefficient and or subscript. 3AgNO3 2AgNO3 3. H2O 1. 5. 2. 2MgO2 4. 2KOH 6. CO2

  9. What is a chemical equation? • A chemical equation is a representation of a chemical reaction on paper.

  10. Examples of chemical equations. • 2H2 + O2 2H2O • CaO + H2O Ca(OH)2 • C + O2 CO2

  11. 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

  12. Parts of a Chemical Equation C O2 CO2 yields + or produces PRODUCTis the new substance or substances produced and are on the right side of the arrow. REACTANTS are the starting materialson the left side of the arrow.

  13. Reactants & Products • Identify the reactants and products. • CH4 + O2 CO2 + 2H2O • 3H2 + N2 2NH3 • 2H2 + O2 2H2O • CaO + H2O Ca(OH)2

  14. 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?

  15. 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?

  16. 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?

  17. 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?

  18. Count the atoms • Identify and count the number of atoms in the chemical equations. • CH4 + 2O2 CO2 + 2H2O • 4Al + 3O2 2Al2O3 • 2K + 2H2O 2KOH + H2

  19. All chemical equations must be balanced ! ! !

  20. 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.

  21. P O2 P4O10 4 5 + 4 atoms of P 4 atoms of P = 10 atoms of O 10 atoms of O balanced

  22. H+O2H2O H =1 atom H =2 atoms = O =2 atoms O =1 atom H+O2H2O 4 2 H =4atoms H =4 atom = O =2atoms O =2atoms

  23. Mg + O2 MgO 2 2 Mg = Mg = O = O = 1 2 1 2 2 1 2

  24. Ca + O2 CaO 2 2 Ca = Ca = O = O = 1 2 1 2 2 1 2

  25. N2 + H2 NH3 3 2 2 N = N = H = H = 2 1 2 6 6 3

  26. Cu2O + C  Cu+ CO2 2 4 1 Cu = Cu = O = O = C = C = 4 2 4 1 2 2 1 1

  27. H2O2 H2O+O2 2 2 4 H = H = O = O = 2 4 2 2 3 4 4

  28. Balance the equations ? • Mg + O2MgO • H2 + N2NH3 • CH4 + O2CO2+ H20 ? ? ? ? ?

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