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# notestest2 - Notes Test 2 chapters 5 6 and 7 Sept 21...

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Notes Test 2 chapters 5, 6 and 7 Sept. 21 Chapter 5 You will need the following information to do the worksheet: 1. Atomic number- the number of protons in the atom 2. Mass number ( atomic mass) - protons plus neutrons 3. Z= Atomic Number A = Atomic Mass 4. Potassium (K) has an atomic number of 19. Cobalt (Co) has an atomic number of 27. Lithium (Li) has and atomic number of 3. Students did worksheet titled: Chapter 5: ChemActivity 1- The Nuclear Atom. Open Link 9 and do pages 1-4. Open Link 9B for answers. Sept. 23 Questions that were asked after The Nuclear Atom Exercise.

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Board problems relating to Worksheet: Chapter 5 1. How many protons, neutrons, and electrons in: (a) Ca 20,20,20 (b) Ag 47, 61, 47 (c) C 6,6,6 (d) U 92,146, 92 (e) Cl - ion 17,18, 18 (f) Ca 2+ 20,20,18 How to determine the electrons, protons, and neutrons in an ion: How many protons, neutrons, and electrons in Al 3+ ? The protons and neutrons are the same as in an atom: protons = 13 ( the atomic number), neutrons = 14 ( mass number - atomic number). In an atom ( which is neutral) the electrons would be the same as protons, 13, but since Al has a 3+ charge the protons and electrons can't be equal. Now, don't add three protons because that will change the element from Al to S. So, to make the charge we take away 3 electrons( negatives ). Now we will have 13 + (protons) and 10 - ( electrons). If you add 13+ and 10- you get 3+ which is the charge of the ion. Try this one: how many protons, neutrons, and electrons in S 2- ? protons = 16, neutrons = 16, electrons = 18 Remember: 16+ (protons) + 18- ( electrons ) = 2- Do not try to take or add protons. They are in the nucleus and bound tightly. 2. Define: Mass Number and Atomic Number (a) p + n (b) p
1 amu = 1.6606 X 10 -24 g: What is the mass of 12/6 C? (12 amu/1)(1.6606X 10 -24 g/1 amu) = 1.9927 X 10 -23 g. 4. What do all atoms of the same element have in common? How can atoms of the same element differ. When atoms of the same element differ in this way, they are called ____ or____. (a) protons (b) neutrons and electrons (c) isotopes or ions 5. Complete the chart Symbol Atomic # Mass Number P N E 12 24 Na 9 (a) Mg, 12,24,12, 12,12 (b) Na, 11,23,11,12,11 (c) F,9,19,9,10,9 6. ?/? X , ?/? X put in possible numbers on top and bottom so these will be isotopes. ( one answer 16/8, 17/8- as long as the atomic number(protons) are the same number it is an isotope. So, the number on bottom must be the same.) Continued notes chapter 5 1. Define molecule and diatomic molecules p 125 Molecule: Two or more atoms that function as a unit because they are chemically bound. Diatomic Molecule: A molecule containing 2 atoms. 2. Chemical Formulas and analyze formulas: p 128 (a) H 2 O = one O and two H (b) 2 H 2 O= two O and four H (C) C 12 H 22 O 11 = twelve C, twenty two H, and eleven O (d) Ca (NO 3 ) 2 = one Ca, two N, and 6 O 3. P, N, E where are they and what is their mass p 132 electron = 9.109 X 10 -28 g , neutron = 1.675 X 10 -24 g , proton = 1.673 X 10

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notestest2 - Notes Test 2 chapters 5 6 and 7 Sept 21...

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