What Are We Doing Today? QOD Collect ICEPACs (make sure your name is clear) Show Website (Teacher Pages) Recycling Chapter 2 (Molecules) Practice Problems.

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Presentation transcript:

What Are We Doing Today? QOD Collect ICEPACs (make sure your name is clear) Show Website (Teacher Pages) Recycling Chapter 2 (Molecules) Practice Problems What to do with your formal lab Get back assignment & lab

The Mole Q: how long would it take to spend a mole of $1 coins if they were being spent at a rate of 1 billion per second?

Mollionaire Q: how long would it take to spend a mole of $1 coins if they were being spent at a rate of 1 billion per second? A: $ 6.02 x / $ = 6.02 x payments = 6.02 x seconds 6.02 x seconds / 60 = x minutes x minutes / 60 = x hours x hours / 24 = x 10 9 days x 10 9 days / = x 10 7 years A: It would take 19 million years

Website Website. If you miss class, you are still responsible for the work missed.

Recycling Jobs If they leak, get a second bag!

Fun Question Time Are the following substances molecules? Explain your answer. Read page of your text if you need help. a)NaCl d)Co b)O 2 e)CO c)Auf)H 2 SO 4

A:Yes, it is a molecule because it contains two different atoms: sodium and chlorine. B:Yes, it is a molecule because it contains two oxygen atoms. C:No, it is not a molecule; it is only one atom: gold. Are the following substances molecules? a)NaCl b) O 2 c)Au

No, it is not a molecule; it is only one atom: cobalt. Yes, it is a molecule because it contains two different atoms: carbon and oxygen. Yes, it is a molecule because it contains several different atoms: two hydrogen atoms, one sulphur atom and four oxygen atoms. Are the following substances molecules? d)Co e)CO f)H 2 SO 4

What is a Molecule? A molecule: is a group of two or more atoms that stick together. atoms

A molecule is an aggregate of two or more atoms in a definite arrangement held together by chemical bonds H2H2 H2OH2ONH 3 CH 4 A diatomic molecule contains only two atoms H 2, N 2, O 2, Br 2, HCl, CO A polyatomic molecule contains more than two atoms O 3, H 2 O, NH 3, CH 4

What is an Ion? An Ion: Is an atom that has become electrically charged by losing or gaining one or more electrons.

 Ion – atom or group of atoms that has a net positive or negative charge.  Cation – positive ion; lost electron(s).  Anion – negative ion; gained electron(s). Ions

An ion is an atom, or group of atoms, that has a net positive or negative charge. cation – ion with a positive charge If a neutral atom loses one or more electrons it becomes a cation. anion – ion with a negative charge If a neutral atom gains one or more electrons it becomes an anion. Na 11 protons 11 electrons Na + 11 protons 10 electrons Cl 17 protons 17 electrons Cl - 17 protons 18 electrons

Table of common charges formed when creating ionic compounds. Groups or Families Group or FamilyCharge Alkali Metals (1A)1+ Alkaline Earth Metals (2A) 2+ Halogens (7A)1– Noble Gases (8A)0

The Periodic Table

Exercise Fluorine contains 9 electrons and 9 protons. What is the charge of this atom? Zero

Exercise Fluorine tends to gain an electron. If Fluorine contains 10 electrons and 9 protons. What is the charge of this atom? -1 (negative one)

Exercise magnesium contains 12 electrons and 12 protons. What is the charge of this atom? Zero

Exercise Magnesium tends to lose two electrons. If Magnesium contains 10 electrons and 12 protons. What is the charge of this atom? +2

What to do now? Questions # 2- 6 on page 62 of your textbook