1 / 37

Section 9.1 REACTIONS AND EQUATIONS

Section 9.1 REACTIONS AND EQUATIONS. In a chemical reaction…. atoms are ____________ (fill in the blank). What are some common reactions in your everyday life?. How can you tell when a chemical reaction has taken place ?.

kaili
Download Presentation

Section 9.1 REACTIONS AND EQUATIONS

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. Section 9.1REACTIONSANDEQUATIONS

  2. In a chemical reaction… atoms are ____________ (fill in the blank)

  3. What are some common reactions in your everyday life?

  4. How can you tell when a chemical reaction has taken place?

  5. Formation of a ___________________also known as a ___________________

  6. HOW DO CHEMISTS REPRESENT CHEMICAL REACTIONS?

  7. Chemists use ______________ to represent chemical reactions. The starting substances are __________________What youend up with are _____________When do you use chemical equations in your own life?

  8. REAL LIFE EXAMPLE:You are going to bake cookies. You know that: ____flour + ____sugar + ____baking powder + ___butter + ___chocolate chipsmakes ___cookies This is a _______________EQUATION. What are theproduct(s)?What arethereactant(s)?

  9. What else do you need to know…. if you already know that you need to bake them at 350 for ½ hour??

  10. You need to know the _________________ ______________________ of the ingredients with respect to each other.In other words, you need a ___________________ ________________(Remember – cooking is chemistry!!)

  11. HOW MIGHT A CHEMIST USE A CHEMICAL EQUATION?

  12. You are anEVIRONMENTAL CHEMISTconcerned aboutGLOBAL WARMING You are asked to determine how much carbon dioxide will be produced from the amount of methane burned by a factory. The first thing you need is aWORD EQUATION

  13. methane + oxygenyields carbon dioxide+ water

  14. Word equations are clunky and they don’t tell you very much… You can make your equation less clunky if you use _________________________instead of words.

  15. __ CH4 + __O2 __CO2 + __ H2O This type of equation is a ____________ equation.

  16. In addition, to give more information in an equation, symbols are used to represent the _____________________ of the substances, including:Solids = _______ Aqueous = ______Gases = _______ Liquids = ______(Aqueous means ___________________________________________________

  17. __ CH4(g) + __ O2(g) __ CO2(g) +__ H2O(l)This equation still doesn’t have enough information…What else do you need?

  18. What law allows us to balance equations? State this law.

  19. CH4 CO2 O2 H2O

  20. A very important rule in balancing equations: never change the________________________ For example:______ cannot be changedto_______

  21. However, the coefficients can be changed in order to balance the equation. Begin by counting the number of ___ Na(s) + ___ Cl2(g) ___ NaCl (s)

  22. __ Al2O3(s) ___ Al(s)+ ___O2(g)

  23. ___ Fe(BrO3)3 → ___ FeBr3 + ___ O2

  24. ANOTHER RULE:If you balance an equation, and then find that all of the coefficients are divisible by a common number, you must divide them by that number…

  25. 2CH4 + 4O22CO2+4H2O WRONG!

  26. CH4 +2O2CO2+2H2O RIGHT!!

  27. Hint #1If a polyatomic ion appears unchanged on both sides of the equation, balance it as a unit – not as individual atoms

  28. Example #1 of Hint #1 __Al(NO3)3 + __LiOH __LiNO3 + __ Al(OH)3

  29. ] [ [ ] [ ] [ ] [ ] [ ] Al(OH)3 Al(NO3)3 [ ] [ ] LiOH LiNO3

  30. Example #2 of Hint #1 __(NH4)3PO4 +__ BaSO4 __(NH4)2SO4 +__Ba3(PO4)2

  31. Example #3 of Hint #1:(involves an acid-base reaction)__ H2SO4 + __KOH ___K2SO4 + __ H2O

  32. Hint #2 for balancing an equation:First, balance an element that only appears in one reactant and one product (leaving oxygen to last and hydrogen to second last.) __C3H8+__O2 __CO2 + __H2O

  33. Example of Hint #2__C5H12 (g)+__O2(g) __CO2(g) + __H2O(l)

  34. HINT #3If you balance all of the elements ansd the polyatomic ions, except for one element, and there’s an odd # of that element on one side, and an even number on the other side – balance that element with a fractional number (containing ½) and then double all of the coefficients

  35. EXAMPLE:__C5H10 + __O2 __CO2 + __H2O

  36. __C6H14 + __O2 __CO2 + __H2O

More Related