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2Cu + O 2 2 CuO When 127 g of copper reacts with 32 g of oxygen gas to form copper (II) oxide, not oxygen is left over. How much copper (II) oxide is produced? A. 32 g B. 95 g C. 127 g D. 159 g.

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  1. 2Cu + O2 2 CuO When 127 g of copper reacts with 32 g of oxygen gas to form copper (II) oxide, not oxygen is left over. How much copper (II) oxide is produced? A. 32 g B. 95 g C. 127 g D. 159 g Elements that are chemically similar to calcium can interfere with the function of neurons. Which of the following is most likely to imitate calcium’s role in the function of neurons? A. Sodium B. Potassium C. Strontium D. Rubidium You have 6 minutes left!!

  2. 2Cu + O2 2 CuO When 127 g of copper reacts with 32 g of oxygen gas to form copper (II) oxide, not oxygen is left over. How much copper (II) oxide is produced? A. 32 g B. 95 g C. 127 g D. 159 g Elements that are chemically similar to calcium can interfere with the function of neurons. Which of the following is most likely to imitate calcium’s role in the function of neurons? A. Sodium B. Potassium C. Strontium D. Rubidium You have 5 minutes left!!

  3. 2Cu + O2 2 CuO When 127 g of copper reacts with 32 g of oxygen gas to form copper (II) oxide, not oxygen is left over. How much copper (II) oxide is produced? A. 32 g B. 95 g C. 127 g D. 159 g Elements that are chemically similar to calcium can interfere with the function of neurons. Which of the following is most likely to imitate calcium’s role in the function of neurons? A. Sodium B. Potassium C. Strontium D. Rubidium You have 4 minutes left!!

  4. 2Cu + O2 2 CuO When 127 g of copper reacts with 32 g of oxygen gas to form copper (II) oxide, not oxygen is left over. How much copper (II) oxide is produced? A. 32 g B. 95 g C. 127 g D. 159 g Elements that are chemically similar to calcium can interfere with the function of neurons. Which of the following is most likely to imitate calcium’s role in the function of neurons? A. Sodium B. Potassium C. Strontium D. Rubidium You have 3 minutes left!!

  5. 2Cu + O2 2 CuO When 127 g of copper reacts with 32 g of oxygen gas to form copper (II) oxide, not oxygen is left over. How much copper (II) oxide is produced? A. 32 g B. 95 g C. 127 g D. 159 g Elements that are chemically similar to calcium can interfere with the function of neurons. Which of the following is most likely to imitate calcium’s role in the function of neurons? A. Sodium B. Potassium C. Strontium D. Rubidium You have 2 minutes left!!

  6. 2Cu + O2 2 CuO When 127 g of copper reacts with 32 g of oxygen gas to form copper (II) oxide, not oxygen is left over. How much copper (II) oxide is produced? A. 32 g B. 95 g C. 127 g D. 159 g Elements that are chemically similar to calcium can interfere with the function of neurons. Which of the following is most likely to imitate calcium’s role in the function of neurons? A. Sodium B. Potassium C. Strontium D. Rubidium You have 1 minute left!!

  7. Writing Chemical Formulas PAGE 27

  8. Chemical Formulas What is a chemical formula? It is the ratio of atoms bonded together in a compound, for example, X:Y Where x and y are called the subscripts. AxBy

  9. Chemical Formulas Remember NaCl? The chemical formula shows that sodium and chlorine atoms combine in a 1:1 ratio: Every molecule of sodium chloride contains 1 atom of Na and 1 atom of Cl, in a 1:1 ratio. NaCl=Na1Cl1

  10. Chemical Formulas Net charge In order to be stable, a compound must have net electrical charge of ZERO.

  11. Oxidation Numbers Oxidation Numbers Tells how many valence electrons are gained, lost or shared when bonding. A (+) or a (-) is written after the number of electrons, ex: 1+, 1-, 2+, 2-, 3+, 3- For example, a sodium atom always ionizes to Na+when it combines with other atoms to form a compound.Therefore, we say that Na has an oxidation number of 1+.

  12. Oxidation Numbers

  13. Copy onto your periodic table Transition Metals

  14. Oxidation Numbers What about transition metals? Transition metals (between group IIA and IIIA) have more than one oxidation number. Roman numerals show the oxidation number.

  15. Chemical Formulas So how to write a chemical formula? 1. Find the oxidation number of the ions. 2. Criss-cross the oxidation numbers to subscripts so that the sum of the oxidation numbers is zero.

  16. Chemical Formulas Write the formula for compound made of iron (III) and oxygen 1. Find oxidation numbers: iron (III) = Fe3+ (it loses three electrons) oxygen = O2- (it gains two electrons) 2. To determine the ratios of ions, use the criss-cross method:

  17. Chemical Formulas What about polyatomic ions? Polyatomic ions contain more than one type of ion. Each polyatomic ion is treated like a single ion!

  18. Chemical Formulas Writing formulas with polyatomic ions Write a parenthesis around the polyatomic ion and treat it like any other ion... For example, write the formula for aluminum sulfate 1. Find the oxidation numbers: Aluminum = Al3+ Sulfate = SO42- 2. Use the criss-cross method: Al3+SO42- 23 So the formula will be: Al2(SO4)3

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