1 / 31

Counting Atoms and Balancing Chemical Equations Write what is in Blue

Counting Atoms and Balancing Chemical Equations Write what is in Blue. Elements, Compounds, Mixtures. Hydrogen is an element. Oxygen is an element. When hydrogen and oxygen bond they make the compound water.

wyatt-castro
Download Presentation

Counting Atoms and Balancing Chemical Equations Write what is in Blue

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. Counting Atoms and Balancing Chemical EquationsWrite what is in Blue

  2. Elements, Compounds, Mixtures • Hydrogen is an element. • Oxygen is an element. • When hydrogen and oxygen bond they make the compound water. • When salt and water are combined, a mixture is created. Compounds in mixtures retain their individual properties. The ocean is a mixture.

  3. Elements, compounds, and mixtures • Mixtures can be separated by physical means. • Compounds can only be separated by chemical means. • Elements are pure substances. When the subatomic particles of an element are separated from its atom, it no longer retains the properties of that element.

  4. Identifying Compounds • Each new element is identified by a capital letter • Example: H2SO4 • The elements in Sulfuric Acid • Hydrogen • Sulfur • Oxygen

  5. Subscripts • C12H22O11 • There are 12 atoms of Carbon • There are 22 atoms of Hydrogen • There are 11 atoms of Oxygen • If there is not a subscript listed, it is understood to be 1. • Example: NaCl • There is one atom of Sodium • There is one atom of Chlorine

  6. NaHCO3 Sodium – 1 Hydrogen – 1 Carbon – 1 Oxygen -3 HCl Hydrogen – 1 Chlorine - 1 You Practice!

  7. There are times you will see a compound with parenthesis. Pb(NO3)2 The 2 after the parenthesis indicates there are two sets of the parenthesis. Pb(NO3) (NO3) So, in counting the atoms, you would have the following: Lead – 1 Oxygen - 6 Nitrogen -2

  8. (NH4)3PO4 Nitrogen – 3 Hydrogen – 12 Phosphorus – 1 Oxygen – 4 Mg(OH)2 Magnesium – 1 Oxygen – 2 Hydrogen – 2 You Practice!!

  9. Coefficient 2H2SO4 This means there are 2 compounds of Sulfuric Acid. Think: H2SO4 H2SO4 Counting the atoms: Hydrogen – 4 Sulfur – 2 Oxygen - 8

  10. 3H3PO4 Hydrogen – 9 Phosphorus – 3 Oxygen - 12 2H2O Hydrogen – 4 Oxygen - 2 You Practice!!

  11. Got It????

  12. Movin' On!!

  13. Chemical Equations Chemical equations express what is happening in a chemical reaction using symbols. 4K + Cl2 2KCl Reactant Product

  14. Law of Conservation of Mass In a chemical reaction, matter cannot be created or destroyed. It can only be changed.

  15. What does that mean?? The reactants MUST contain the same elements and the same number of each element as the product. They CAN be in different compounds.

  16. HUH????? H2 + O2 H2O Reactants: H = 2 O = 2 Products: H = 2 O = 1 This cannot happen. An oxygen atom cannot be destroyed.

  17. So what do we do? The chemical equation must be written according to the law. AGAIN --- HUH??? H2 + O2 H2O is the production of water. Well, how it actually happens in nature is this…. 2H2 + O2 2H2O Reactants: H = 4 O = 2 Products: H = 4 O = 2

  18. Do I Need to Know How to Balance? NOT YET. You need to be able to recognize if the chemical reaction follows the law of conservation of mass. Na + O2 Na2O Mg + 2HCl MgCl2 + H2 NOPE YUP!!

  19. You Practice!!! HgO Hg + O2 N2 + 3H2 2NH3 Zn + 2HCl ZnCl2 + H2 NOPE YUP YUP

  20. More Practice K + Br2 2KBr 2Fe + O2 6Fe2O3 2Na + 2H2O 2NaOH + H2 NOPE NOPE YUP

  21. Got It???

  22. Warm Up 3/9Is it balanced? Show your work!! • Al + O2 ---> Al2O3 • SiCl4 + H2O ---> H4SiO4 + HCl

  23. Balancing Chemical Equations H2 + O2 H2O Reactants: H = 2 Products: H = 2 O = 2 O = 1 What do we multiply by 1 to get 2?

  24. Keep Going…. H2 + O22H2O Reactants: Products: 2=H = 4 2 =O = 2 Now the Oxygen is balanced but Hydrogen is not, so what do we multiply by 2 to get 4?

  25. Almost There!!! 2H2 + O2 2H2O Reactants: Products: 4 H = 4 2=O = 2 Now it is balanced!!! Congratulations, you have now learned the hardest thing we will do all year!!

  26. Now You Practice HgO Hg + O2 =Hg = =O = K + Br2 2KBr =K = =Br =

  27. Warm Up 3/11Write Q&A • Why do we have to balance equations? (What law do we have to follow?)

  28. Warm Up 3/10Write Q&A • Balance the Following: • HNO3 + Ca(OH)2 Ca(NO3)2 + H2O

  29. Warm Up 3/8Write the Following: The Law of Conservation of Mass In a chemical reaction, matter cannot be created or destroyed. It can only be changed.

  30. Warm Up 3/5Write Q&A • How many atoms are in 3Pb(OH)4? • Pb • O • H

  31. Warm Up March 4Write Q&A • The vertical columns on the periodic table are called ______________ and they correspond to the number of __________ • The horizontal rows on the periodic table are called ____________ and they correspond to the number of __________

More Related