Unit 3 Review Chemistry

Matching 1. Periodic Table of Elements 2. Atom 3. Ductility-not Duckability 4. Metalloids 5. Mass 6. Chemical Symbols 7. Chemical Formulas 8. Density 9. Metals 10. Malleable 11. Volume 12. Precipitate 13. Elements 14. Non-metals

Elements and Chemical Symbols 1) O 2) H 3) Fe 4) C 5) Ne 6) Potassium 7) Gold 8) Helium 9) Boron 10) Nitrogen

Open-Ended Reponses 1. Made of only one type of atom. 2. Presence on the Periodic Table of Elements. 3. Represented by a chemical symbol.

Identification  HO 4 CSiNe 2 – 5 - Hydrogen, Oxygen, Carbon, Silicon, Neon  KCHe 2 O 3 Fe – 5 -Potassium, Carbon, Helium, Oxygen, Iron  NaClB – 3 - Sodium, Chlorine, Boron  CS 2 FeO – 4 - Carbon, Sulfur, Iron, Oxygen  H 2 SFeNO 3 K – 6 - Hydrogen, Sulfur, Iron, Nitrogen, Oxygen, Potassium

3 ways to identify a compound 1. Made of more than one type of atom or element. 2. Not located on the Periodic Table of Elements. 3. Represented by a chemical formula.

2 differences  Element –  A pure substance that contains only one type of atom.  Found on the periodic table, represented by chemical symbols  Compound –  A substance that contains two or more types of atoms.  Not found on the periodic table, represented by a chemical formula

Evidence of Chemical Change 1.Formation of a gas. a. Usually in the form of bubbles or fizzing. 2.Formation of a precipitate. a. A solid is formed when two liquids are combined. 3.Color change 4.Production of light a. Combustion – fire. 5.Temperature change Follow along in textbook – pages 67-70

Chemical or Physical Description of change using properties Physical or Chemical Change (Circle one) Kool-Aid dissolving in water (mixing in) Physical Change Chemical Change A rusting nail Physical Change Chemical Change The statue of Liberty changing color overtime Physical Change Chemical Change Burning paper changes its color, mass, volume, and flammability Physical Change Chemical Change Water changing state of matter into ice. Physical Change Chemical Change Two liquids combining and forming a solid. Physical Change Chemical Change

Metals Magnetic Malleable Ductile Shiny Luster Conductive Not Brittle

Non-Metals Not Magnetic Not Malleable Not Ductile Dull Luster Not Conductive Brittle

Metalloids Metalloids have physical properties of both metals and nonmetals. Semiconductor – conducts electricity at high temperatures but does not at low temperatures.

Density 1. D=mass/volume 2. Grams 3. mL or cm 3 4. grams/mL or grams/cm g/cm g/cm g/mL

Multiple Choice 1) D 2) C 3) C 4) A 5) D 6) B 7) B 8) D 9) B 10) D