Understanding Chemical Reactions: Indicators and Atoms Rearrangement

1. Wednesday, March 19, 2014 EW: What are 3 indications that a chemical reaction has taken place? Today: Chemical Reactions Notes Alkaline Earth Metals Lab

2. Describing Chemical Reactions

3. 13.1 Chemical formulas • A molecule’s chemical formula tells you the ratio of atoms of each element in the compound.

4. A chemical reaction is the process of breaking of chemical bonds (ionic or covalent) in one or more substances, and the reforming of new bonds to create new substances • indicators of chemical change are: • formation of new gas • formation of new precipitate (solid) • release of energy (heat or light) • color change

6. Alkaline Earth Metals Lab

7. Thursday, March 20, 2014 • LT: I can demonstrate how chemical reactions rearrange atoms in molecules. • EW: How many elements in CO2? How many atoms? • Today: • Alkaline Earth Metals Conclusion • Carbon Compound Notes

8. Thursday, March 20, 2014 • LT: I can demonstrate how chemical reactions rearrange atoms in molecules. • Cool Friday Thing • Today: • Turn in Alkaline Earth Metals Conclusion • Turn in Covalent Bonding Worksheet • Carbon Compound Notes

9. Friday, March 21, 2014 • LT: I can demonstrate how chemical reactions rearrange atoms in molecules. • Cool Friday Thing! What animal would you like to be friends with? • Today: • Ch. 13 Quiz • Finish Carbon Compound Notes

10. 13.3 The chemistry of carbon • Because carbon has 4 valence electrons it can form 4 covalent bonds allowing it to make large molecules. • Carbon molecules come in three basic forms: straight chains, branching chains, and rings. • All three forms are found in important biological molecules.

11. 13.3 Organic compounds • Scientists classify the organic molecules in living things into four basic groups: carbohydrates, proteins, fats, and nucleic acids. • All groups, except fats, form molecules called polymers (large molecules composed of repeating units, called monomers, like beads in a necklace)

12. 13.3 Carbohydrates • Carbohydrates • energy-rich compounds • made of carbon, hydrogen, and oxygen • classified as sugarsor starches • Glucose is a single sugar (monomer) • Starch is a long chain of sugars (polymer) • Cellulose is in plant material (wood) (polymer)

13. Monday, March 24, 2014 • LT: I can demonstrate how chemical reactions rearrange atoms in molecules. • EW: Name one carbohydrate you have eaten today. • Today: • Finish Carbon Compound Notes • Go over Covalent Bonding Wksht

14. 13.3 Lipids • Lipids • Like carbohydrates, energy-rich compounds • made from carbon, hydrogen, and oxygen • include fats, oils, and waxes.

15. 13.3 Proteins • Proteins • basic molecular building blocks of cells and all parts of animals • among the largest organic molecules (polymers) • Ex. Enzymes, hemoglobin, keratin (hair, skin, nails)

16. 13.3 Nucleic Acids • Instructions for cellular reactions • Ex. DNA & RNA (polymers) • 5-carbon sugars • Nitrogen containing base • phosphate groups

17. Tuesday, March 25, 2014 • LT: I can demonstrate how chemical reactions rearrange atoms in molecules. • EW: Name the 4 types of organic carbon compounds and give an example of each one. • Today: • Chemical Reaction Notes & Reading

18. Chemical Reactions • energy is stored in ionic and covalent bonds • exothermic reaction– energy is released (burning) • endothermic reaction– energy is absorbed (cold packs)

19. Conservation of mass • matter cannot be created nor destroyed in chemical reactions

20. chemical equations convey as much info. as possible about what happens in a chemical reaction during a chemical change

21. some important chemical reactions • burning of fossil fuels • photosynthesis • rusting of metals

22. Balancing Chemical Equations • each side of the equation must have the same number of atoms of each elements • bicycle example • skeletal equation • frame + wheel + handlebar + pedal → bike • balanced equation • frame + 2 wheels + handlebar + 2 pedals → bicycle • tricycle example • skeletal equation • frame + wheel + handlebar + pedal → bike • balanced equation • frame + 3 wheels + handlebar + 2 pedals → tricycle

24. NOT BALANCED! BALANCED!

25. Wednesday, March 26, 2014 • LT: I can demonstrate how chemical reactions rearrange atoms in molecules. • EW: 1. A __________ tells me how many atoms of each element are in a compound. 2. A __________ tells me how many molecules of each compound are needed to balance the chemical reaction equation. • Today: • Chemical Reaction Reading & Simulation

26. this is NOT balanced

27. How about these? • ?KCl + ? H2SO4 ? HCl + ? K2SO4 • 2KCl + H2SO4 2HCl + K2SO4 • NaCl(aq) + AgNO3(aq)  AgCl(s) + NaNO3(aq) • balanced • Al(s) + O2(g)  Al2O3(s) • 4Al(s) + 3O2(g)  2Al2O3(s)

28. Rearranging Atoms in Chemical Reactions • Read the text. When finished come get a packet of materials for you and a partner. • Look at the card with the 3 chemical reactions. • For the 1stchemical reaction, usethe “atom” cards and arrange the reactants on the left. • CHEMICAL REACTION! Place the arrow in the middle after the reactants. • Rearrange the “atom” cards to make the products. • Repeat for the other 2 chemical reactions. • Was law of conservation of mass maintained? How do you know? • Answer the question above and all 4 questions on the last page of the reading on your own paper.

29. Thursday, March 27, 2014 • LT: • EW: • Today: • Rate of Chemical Reactions Lab

30. Wednesday, March 26, 2014 • LT: • Today: • Rate of Reaction Conclusion • Concluding Statement – did the levels of the independent variable create a trend in the data? • Support your conclusion with data – cite low and high values, talk about trend or no trend • What does data tell you? • Therefore statement – I learned • Potential errors in lab, how you could improve lab, etc. • Ch. 14 V & C Work time