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Test Review

Test Review. Test 2 – Thursday. Review Material. What is matter? What are the units for length, mass, volume? Define and give examples of physical properties. Define and give examples of chemical properties. Identify physical changes.

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Test Review

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  1. Test Review Test 2 – Thursday

  2. Review Material • What is matter? • What are the units for length, mass, volume? • Define and give examples of physical properties. • Define and give examples of chemical properties. • Identify physical changes. • Identify chemical reactions. Know the 5 indicators of a reaction.

  3. Question • What is the definition of matter? • Anything that has a volume. • Anything that has a mass. • Anything that has mass and volume.

  4. Question • What is the tool used to measure mass and what are the corresponding units? • Triple beam balance, grams • Triple beam balance, mL • Graduated cylinder, mL • Graduated cylinder, g

  5. Question • Which of these is NOT a physical property? • Solubility • pH • Corrosiveness • Ductility

  6. Question • What is the indicator that baking soda and vinegar is a chemical reaction? • The baking soda dissolves. • There is a gas produced.

  7. Atoms • Atoms have two regions: the nucleus and the electron cloud. • There are three subatomic particles: protons, neutrons, electrons. • Protons are positive, neutrons are neutral, electrons are negative. • The protons and neutrons live inside the nucleus. The electrons orbit the nucleus.

  8. Using the Periodic Table 11 Na Sodium 22.9898 Atomic number: tells the number of p+ and e-. They must EQUAL. Na: this is the element symbol. Atomic mass/mass number: tells the number of p+ and n in the nucleus. To get the number of n, you must subtract the atomic number from the atomic mass.

  9. Question • How many electrons are in an atom of Ne? • 20 • 10

  10. Question • How many neutrons are in an atom of K? • 19 • 39 • 39-19

  11. Question • Who lives inside the nucleus? • Positive protons and negative neutrons • Positive protons and negative electrons • Positive protons and neutral neutrons

  12. Organization of the Periodic Table • The periodic table is organized according to the atomic number…(starts with 1, 2, 3, 4…) • The groups/families/columns go up and down. There are 18 of them. • The rows/periods go left to right. There are 7 of them. • The staircase represents the metalloids. The metals are on the left of the zigzag and the nonmetals (except H) are on the right.

  13. Family Names • The groups have special family names. • Group 1: Alkali metals • Group 2: Alkaline Earth metals • Groups 3-12: Transition metals • Group 17: Halogens • Group 18: Noble Gases • Remember, for 13-15, they are named after the first element in the family.

  14. Question • Si would be considered as a: • Metal • Alkali metal • Metalloid

  15. Question • Which element is a halogen in period 4? • Br • I • Cl

  16. Question • What is the transition metal that is in group 12 row 4? • Zn • Cd • Cu

  17. Question • What is the only metal on the nonmetal side? • Hydrogen • Mercury • There is not one.

  18. Metals • Metals are found on the left side of the staircase. • Metals usually have the following properties: • Reactive • Ductile • Malleable • Solid at room temperature (except Hg) • Conduct heat/electricity

  19. Nonmetals • Nonmetals are on the right side of the zigzag line. • The only nonmetal that is on the metal side is HYDROGEN. • Properties of most nonmetals: • Poor conductors of heat/electricity • Brittle • Gas at room temperature • Dull

  20. Metalloids • These are on either side of the “staircase” • Properties of metalloids are: • Semi-conductors (they conduct heat/electricity under certain conditions) • Solid at room temperature

  21. Uses for metals, nonmetals, metalloids • Metals are used to conduct heat/electricity. Think steel pots, copper wiring. They are used for making coins/jewelry because they are easily shaped (think gold rings and copper pennies). • Metalloids are used in computer chips because they are semi-conductors. They conduct electricity under certain conditions only. • Nonmetals are mostly gases. They react very well with metals (think oxygen reacting with iron to form rust.

  22. Question • Which would be a good conductor of electricity? • Boron • Ar • Cu

  23. Question • Which would most likely be brittle? • Iodine • Sodium • Gold

  24. Question • Which would most likely be used in a computer chip? • Silicon • Chlorine • K

  25. Review… • If you can answer all of these questions correctly, then you will do great on your test. • It will consist of all multiple choice questions, with the exception of drawing Bohr models. • Practice drawing Bohr models for: • Na • Be • C • Ne • F

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