310 likes | 412 Views
Learn about chemical reactions, indicators of change, the role of alkaline earth metals, and types of organic compounds. Explore the basics of molecules and how atoms rearrange in reactions.
E N D
Wednesday, March 19, 2014 EW: What are 3 indications that a chemical reaction has taken place? Today: Chemical Reactions Notes Alkaline Earth Metals Lab
13.1 Chemical formulas • A molecule’s chemical formula tells you the ratio of atoms of each element in the compound.
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
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
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
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
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.
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)
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)
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
13.3 Lipids • Lipids • Like carbohydrates, energy-rich compounds • made from carbon, hydrogen, and oxygen • include fats, oils, and waxes.
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)
13.3 Nucleic Acids • Instructions for cellular reactions • Ex. DNA & RNA (polymers) • 5-carbon sugars • Nitrogen containing base • phosphate groups
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
Chemical Reactions • energy is stored in ionic and covalent bonds • exothermic reaction– energy is released (burning) • endothermic reaction– energy is absorbed (cold packs)
Conservation of mass • matter cannot be created nor destroyed in chemical reactions
chemical equations convey as much info. as possible about what happens in a chemical reaction during a chemical change
some important chemical reactions • burning of fossil fuels • photosynthesis • rusting of metals
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
NOT BALANCED! BALANCED!
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
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)
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.
Thursday, March 27, 2014 • LT: • EW: • Today: • Rate of Chemical Reactions Lab
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