1 / 15

Understanding Chemical Reactions

Understanding Chemical Reactions. Physical Science Chapter 10.1 Part 2. Our Story So Far. Think, discuss with partner, discuss with class 1) What are signs of a chemical change? DO they always mean there is a chemical change? 2) What does this chemical equation tell you?

rtrembley
Download Presentation

Understanding Chemical Reactions

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Understanding Chemical Reactions Physical Science Chapter 10.1 Part 2

  2. Our Story So Far • Think, discuss with partner, discuss with class • 1) What are signs of a chemical change? DO they always mean there is a chemical change? • 2) What does this chemical equation tell you? CH4+2O2 -> CO2+2H2O

  3. Balancing Chemical Equations • The reaction combines hydrogen and oxygen molecules. For help -> http://misterguch.brinkster.net/eqnbalance.html Or http://phet.colorado.edu/en/simulation/balancing-chemical-equations

  4. Help -> http://www.quia.com/rr/100887.html • Count the atoms to see if there are the same number of each type of atom on the reactant and product sides of the equation. • Since there is one more oxygen atom on the reactant side than there is on the product side, the reaction equation is not balanced.

  5. A balanced chemical equation has the same number of each type of atom on the product side and the reactant side.

  6. Balancing Chemical EquationsStep by Step • Write the unbalanced equation • NaOH + H2SO4 Na2SO4 + H2O • Draw boxes around all chemical formulas • NaOH + H2SO4 Na2SO4 + H2O • Make an element inventory

  7. Balancing Chemical EquationsCONTINUED • Write numbers in front of the boxes until the inventory before and after balance • 2 NaOH + H2SO4 Na2SO4 + H2O

  8. Balancing Chemical EquationsCONTINUED • You can change the coefficient on both sides -- but not the chemical formulas • 2 NaOH + H2SO4 Na2SO4 + 2 H2O

  9. Your Turn • NaCl + BeF2 NaF + BeCl2

  10. Your Turn • NaCl + BeF2 NaF + BeCl2

  11. Your Turn • 2 NaCl + BeF2 NaF + BeCl2 • Keep going

  12. Your Turn, continued • 2 NaCl + BeF2 2 NaF + BeCl2 • Done!

  13. Warnings • Remember lowest common denominators - they can help • Coefficients are whole numbers • Don’t do this in your head – you are leaning a technique to apply to more complicated chemical equations.

  14. Activity • Chemical Equation Worksheet • Due end of class

More Related