1 / 12

Combining Elements

Physical Science 1 Chapter 20 – Chemical Bonds Meet the Elements – They Might be Giants Elemental Funkiness. →. Combining Elements. The chemical & physical properties of the elements are different than the properties of the compound they make up Na + Cl 2 → NaCl

marisa
Télécharger la présentation

Combining Elements

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Physical Science 1Chapter 20 – Chemical BondsMeet the Elements – They Might be GiantsElemental Funkiness

  2. → Combining Elements • The chemical & physical properties of the elements are different than the properties of the compound they make up • Na + Cl2→ NaCl • Reaction of Sodium with Chlorine

  3. No subscript is understood to mean 1 atom of the previous element Hydrogen Oxygen 2 atoms of the previous element = 2 hydrogen atoms Chemical Formulas • Chemical shorthand of compounds and molecules • Uses the chemical symbols and trailing subscripts to illustrate the type and number of each atom involved in the chemical bond. • Water = H2O

  4. Practice with Chemical Formulas Common Name Chemical Formula Types & Number Type of Bond of Elements involved(ionic - covalent) • Sand SiO2 • Milk of MagnesiaMg(OH)2 • Sucrose C12H22O11 • Vinegar HC2H3O2 • Ethanol C2H5OH →

  5. Atomic Stability • Why do atoms form compounds? • To become stable • What does stable mean to an atom? • Full Set of Valence electrons • Atoms want to have the electron configuration of a noble gas • Atoms will gain, lose or share electrons in order to obtain a full set of valence electrons • Chemical Bonds

  6. Chemical Bonds • IONIC BONDS • between metals & nonmetals • Electrons form a give take relationship • metals give e- (cation) • nonmetal take e- (anion) • Held together by attraction of opposite charges IONIC ANIMATION Types of Bonds

  7. Table Polyatomic Ions Ion – a charged particle due to gaining or losing e- Cations = positive ions, lost e- METALS Anions = negative ions, gained e- NONMETALS PolyatomicIons • The prefix poly- means many in Greek. • ion consisting of a molecule with many covalently bonded atoms • act as a single unit • polyatomic ion is also referred as a radical • Usually end in –ate & –ite • -ide usually indicates binary compounds

  8. + 1 cation – 1 anions – 2 anions – 3 anion

  9. COVALENT BONDS • Between 2 nonmetals • Electrons are shared between both elements • Polar Bonds • an unequal sharing of the e- • Due to a difference of electro-negativity of the atoms • F is the most electronegative element on PT • A simulation of polar covalent bonding in the H2O molecule Only valence electrons are shown • Non-polar Bonds • an equal sharing of e- • nonpolar bond animation • Multiple Bonds – More than one pair of electrons can be shared between atoms • Double Bonds = 2 shared pairs of e- • Triple Bonds= 3 shared pairs of e- • Chemical Bonding • COVALENT QUIZ

  10. Comparing ionic and molecular compounds

  11. Name this compound Ba(Na)2 • BANANA • http://www.accessexcellence.org/RC/VL/GG/ecb/covalent_ionic_bonds.html • http://misterguch.brinkster.net/ioniccovalentworksheets.html • http://www.visionlearning.com/library/module_viewer.php?mid=55

  12. Group the compounds by ratios 1:1, 1:2, 2:1 1:3 & 2:3Using a PT record the group for each element in all compounds Record each groupBased on your patterns, Write rules for the ratio of elements in a compound • Using your rules, predict a formula between Li & F and between Li & O • Using your rules, choose elements to make four compounds that are not already on the sheet. • 3. Explain why MgCl2 is correct and Cl2Mg is incorrect. • 4. How is MgCl2 possible and MgLi2 is not?

More Related