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Element vs. Compound Table 1. Chemical FormulaElement or Compound? FeElement C Cl 2 Element FeCl 2 Compound CCl 4 Compound.

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Presentation on theme: "Element vs. Compound Table 1. Chemical FormulaElement or Compound? FeElement C Cl 2 Element FeCl 2 Compound CCl 4 Compound."— Presentation transcript:

1 Element vs. Compound Table 1. Chemical FormulaElement or Compound? FeElement C Cl 2 Element FeCl 2 Compound CCl 4 Compound

2 1. What does the subscript 2 indicate in Cl 2 ? There are 2 Cl atoms. 2. What is implied if there is no subscript? There is only 1 atom present.

3 3. Classify C, Fe, and Cl as metals or nonmetals. C Fe Cl nonmetal metal nonmetal 4. True or False: “The formulas for elements never contain a subscript.” False: – Cl 2 is an element, but it has a subscript

4 5. Would you expect the formula S 8 to represent a compound or an element? Element 6. Why? There is only 1 type of atom present.

5 7. Classify as element or compound. Co CsOH NaBr PF 5 CO H 2 O HCl element compound CaCl 2 Br 2 SiO 2 P 4 KCl O 2 Ag compoundelement compound element compound element compoundelement

6 Honors Chemistry 12/17/13 “It is quality rather than quantity that matters.” – Lucius Annaeus DO NOW: 1.In your notes: What part of the atom contains almost all of the atom’s mass? AGENDA: 1.Students will be able to describe the difference between an ionic and covalent compound by reviewing our worksheet. HOMEWORK: 1. Finish book work from last week for tomorrow. ANNOUNCEMENT: 1. Science club is meeting today!

7 In your textbook: read section 7.2 (starts on page 210) and answer the following questions: On page 232: numbers 60, 62, 63, 64, 66, 67

8 8. What clues are given in chemical formulas to differentiate between an element and a compound? Multiple capital letters

9 Notes Subscript number = number of each atom present No subscript = 1 atom present Element: made up of only 1 type of atom – may have more than 1 atoms

10 Notes Diatomic Elements – 2 atoms present – Only certain elements exist as diatomic in nature Uncle HOFBrINCl – H 2 O 2 F 2 Br 2 I 2 N 2 Cl 2

11 Notes Compound: made up of more than 1 type of atom – May have metals or nonmetals or both

12 Ionic or Covalent Bond? Table 2. Ionic CompoundCovalent Compound ZnCl 2 CCl 4 Na 2 OP2O5P2O5 Fe 2 O 3 N2O4N2O4 CuINI 3

13 1. The compound ZnCl 2 is considered to be _____ compound. Ionic Compound 2. The compound that contains N and O is a ______ compound. Covalent Compound 3. Does the classification appear to be based on how many atoms are present? No.

14 4. Write the symbols for each element present in Table 2. IonicCovalent ZnCl 2 CCl 4 Na 2 OP2O5P2O5 Fe 2 O 3 N2O4N2O4 CuINI 3 Zn ClNa O Fe Cu I C P N Ionic = metal + nonmetal Covalent = nonmetal + nonmetal

15 6. Classify as ionic or covalent. NaBr OF 2 CsF 2 SF 6 NO 2 CrCl 3 ionic covalent CoBr 2 BaS CO 2 ionic covalent ionic covalent

16 Notes Ionic Compound = a compound with a bond between a metal and a nonmetal Covalent Molecules = a compound with a bond between 2 or more nonmetals

17 Octet Rule Atoms tend to gain, lose, or share electrons so that they have 8 electrons in their outershell.

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19 1.Potassium has ____ valence electrons. a.To achieve the octet rule, it would be easier for potassium to ___________ electrons. (gain/lose) b.This would make potassium a _____________. (cation/anion) c.This is the symbol for potassium’s ion: _________ 1 lose cation K 1+

20 2.Magnesium has ____ valence e - s. a.To achieve the octet rule, it would be easier for magnesium to ___________ electrons. (gain/lose) b.This would make magnesium a _____________. (cation/anion) c.This is the symbol for magnesium’s ion: _________ 2 lose cation Mg 2+

21 3.Boron has ____ valence electrons. a.To achieve the octet rule, it would be easier for boron to ___________ electrons. (gain/lose) b.This would make boron a _____________. (cation/anion) c.This is the symbol for boron’s ion: _________ 3 lose cation B 3+

22 4.Nitrogen has ____ valence electrons. a.To achieve the octet rule, it would be easier for nitrogen to ___________ electrons. (gain/lose) b.This would make nitrogen an _____________. (cation/anion) c.This is the symbol for nitrogen’s ion: _________ 5 gain anion N 3-

23 5.Oxygen has ____ valence electrons. a.To achieve the octet rule, it would be easier for oxygen to ___________ electrons. (gain/lose) b.This would make oxygen an _____________. (cation/anion) c.This is the symbol for oxygen’s ion: _________ 6 gain anion O 2-

24 6.Chlorine has ____ valence electrons. a.To achieve the octet rule, it would be easier for chlorine to ___________ electrons. (gain/lose) b.This would make chlorine an _____________. (cation/anion) c.This is the symbol for chlorine’s ion: _________ 7 gain anion Cl 1-

25 7. Why are noble gases inert? Reactions are movements of electrons. Noble gases already have 8 valence electrons. They don’t need to interact with any other elements.

26 8. What’s the relationship between the charge of an ion and its location in the periodic table? Elements in the same group tend to have the same charges for their ions.

27 Where do the electrons go … when an atom loses an electron? To another ATOM!

28 Where does the electron come from…. when an atom gains an electron? From another ATOM!

29 Ionic Bonding A bond formed between 2 ions by the transfer of electrons

30 Ionic Bonding Usually between a metal and a nonmetal – Metals lose electrons – Nonmetals gain electrons U11ngY

31 Ionic Bonding

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34 Lewis Dots and Ionic Bonding


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