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Balancing Equations

Balancing Equations. In this presentation you will:. explore how equations are balanced. Next >. Introduction. By the law of conservation of mass, the total mass of the reactants in an equation must be equal to the total mass of the products.

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Balancing Equations

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  1. Balancing Equations In this presentation you will: • explore how equations are balanced Next >

  2. Introduction By the law of conservation of mass, the total mass of the reactants in an equation must be equal to the total mass of the products. Here we will examine how equations can be balanced. Next >

  3. An Unbalanced Equation Balancing equations is an important skill within the field of stoichiometry and one which is best learned from examples. The equation: Al + NaOH → Na3AlO3 + H2 shows the formation of sodium aluminum oxide and hydrogen gas, from sodium hydroxide and aluminum metal. However, as the ratios are incorrect, the equation is not balanced. Next >

  4. Balancing this Equation Taking each element in the formula in turn: • There is 1 mole of Al atoms on each side, so Al balances. Al + NaOH → Na3AlO3 + H2 • There is 1 mole Na on the left side and 3 moles on the right, so 3 moles NaOH must be used. Al + 3NaOH → Na3AlO3 + H2 • There are now 3 moles O atoms on each side, so O balances. Next >

  5. Balancing this Equation • There are 3 moles of H atoms on the left, so a fractional amount of H2 molecules are needed on the right. Al + 3NaOH → Na3AlO3 +3/2H2 • Finally, obtain whole numbers of moles by doubling the quantity: 2Al + 6NaOH → 2Na3AlO3 + 3H2 Next >

  6. Question 1 In the unbalanced equation: H2SO4 + NaOH → H2O + Na2SO4two moles of water are produced per mole of sulfuric acid, and two moles of sodium hydroxide are needed to balance the equation. What is the balanced chemical equation for this reaction? A) H2SO4 + NaOH → H2O + Na2SO4 B) 2H2SO4 + NaOH → 2H2O + Na2SO4 C) 2NaOH → H2O + 2Na2SO4 D) H2SO4 + 2NaOH → 2H2O + Na2SO4 Next >

  7. Question 1 In the unbalanced equation: H2SO4 + NaOH → H2O + Na2SO4two moles of water are produced per mole of sulfuric acid, and two moles of sodium hydroxide are needed to balance the equation. What is the balanced chemical equation for this reaction? A) H2SO4 + NaOH → H2O + Na2SO4 B) 2H2SO4 + NaOH → 2H2O + Na2SO4 C) 2NaOH → H2O + 2Na2SO4 D) H2SO4 + 2NaOH → 2H2O + Na2SO4 Next >

  8. Balancing Ionic Equations When ionic equations (showing electric charges on ions) must be used, such as in electrolysis, these must also be balanced to show no loss or gain of charge. For example, the equation Fe3+ + Zn → Fe + Zn2+ is not balanced, but 2Fe3+ + 3Zn →2Fe + 3Zn2+is. Next >

  9. Question 2 Electron transfer occurs between vanadium (III) and sodium ions as follows: V3+ + Na → V + Na+ Balance the ionic equation. A) V3+ + Na → V + 3Na+ B) V3+ + 3Na → V + Na+ C) V3+ + 3Na → V + 3Na+ D) V3+ + 3Na → 3V + Na3+ Next >

  10. Question 2 Electron transfer occurs between vanadium (III) and sodium ions as follows: V3+ + Na → V + Na+ Balance the ionic equation. A) V3+ + Na → V + 3Na+ B) V3+ + 3Na → V + Na+ C) V3+ + 3Na → V + 3Na+ D) V3+ + 3Na → 3V + Na3+ Next >

  11. Summary In this presentation you have seen: • how equations are balanced End >

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