Writing Narrative Poetry Friday, October 2, 2015 9 th Grade MYP.
Friday October 26 th
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Transcript of Friday October 26 th
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Friday October 26th
Name the part of the atom.
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Test Review
• 1. What was Dalton’s concept of the model of the atom (4 parts) – Matter is made up of atoms– Atoms cannot be divided into smaller pieces– All the atoms of an element are exactly alike– Different elements are made of different atoms
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List the particles of an atom
• A. protrons, neutrons and electrons• B. protons are positive– Neutrons are electrically neutral– Electrons are negative
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3. What is the electron cloud?
• The electron cloud is the region surrounding the nucleus. This is where the electrons travel.
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4. Compare isotopes
and atoms
Both have to deal with the number of protons
and electrons
Stable atoms have the same amount of
neutrons as they do protons.
Isotopes have a different number of neutrons
than protons. The more neutrons the more
UNSTABLE the atom becomes.
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5. Which groups are known as the transition elements?
• Groups 3-12 are transitions
• The lanthanides and actinides (located at the bottom of the table) are known as the inner transition elements.
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6. Which groups are known as the representative elements?
• Groups 1,2 13-18 are representative elements.
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7. Where are the inner transition elements located?
• They are located at the bottom of the periodic table, they are known as the lanthanides and the actinides.
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How are the periods different from the groups?
periods
Rows 1-7
Properties that change gradually and predictably as you go
across the table
Groups/families
Groups 1-18 Columns
They are groups of elements that have
similar chemical and physical properties
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9. The atomic number is
• The number of protons of an element. • It can also be the number of neutrons of a
stable element.
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10. Why are the actinides and lanthanides at the bottom of the periodic table?
• They are at the bottom to save space.
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11. Where are the metals located on the periodic table?
• The metals are located to the left of the metalloids.
• To the left of the diagonals.
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12.Where are the nonmetals located on the periodic table?
• Non metals are located to the right of the diagonal (metalloids) except for Hg which is located in group 12.
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13. Where are the metalloids located on the periodic table?
• Metalloids are located along the diagonal on the periodic table.
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14. What type of information is in the element box?
• Name• Atomic number• Atomic mass• Chemical symbol
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15. For each group on the periodic table list:
• A. family members• B. name of the group/family• C. what is special about each group?• D. how many valence electrons do each group
have?• E. common uses for each group: list the
element and use for it
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16. Which of the three elements are known as the iron triad?
• Iron Fe• Cobalt Co• Nickel Ni
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17. In a chemical reaction a catalyst
• Speeds up a reaction
• 18> Which elements can be used as catalyst? – Nickel, zinc, cobalt, ruthenium, rhodium,
palladium, – Platinum group
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19. What are synthetic elements?
• Man made. Made in laboratories and nuclear reactions.
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20. What type of material is used for dental work?
• Nickel and titanium
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21. Why is the periodic table arranged the way it is?
• The atoms are arranged by their atomic number.
• As you go across the rows the properties change gradually and predictably.
• As you look down a column the families/groups have similar physical and chemical properties.
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22. If an element is malleable it is
• Bendable. Stretchable
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23. If the element conducts electricity well it is a
• Metal
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24. What are the energy levels in an atom?
• The different areas for an electron to travel • Each level represents a different amount of
energy
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25. What is a molecule?
• A neutral particle formed when atoms share electrons
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26.What is a chemical formula? A skeleton equation, and a word equation
• Chemical formula: combination of chemical symbols and numbers that indicates which element and how many atoms of each element are present in a molecule.
• A skeletal equation shows just the numbers and chemical symbols
• A word equation is written in words
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28. How does a synthesis reaction differ from a decomposition reaction?
• A synthesis reactions is the opposite of a decomposition reaction. A synthesis reaction puts together
• A decomposition breaks down
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30. How can you use your five senses to detect a chemical reaction?
• Sight: when you see a firefly light up• Taste: when you taste spoilt milk• Smell/ touch: billowing clouds of acrid smoke
and waves of intense heat (burning forest)• Hearing: signal flare, fizzing(bubbles being
released)
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31. What is the difference between a chemical change and a physical change.
• A chemical change: cannot be changed back to the original reactants
• A physical change: just changes the appearance the original reactants are still the same.
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32. Give examples of products and reactants.
• Reactants-are the substances that exist before a reaction happens.
• Product-is the result of the reaction.
• Reactants: cream, sugar, butter, marshmallow cream, chocolate chips
• Result: fudge
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33. Do all reactions require activation energy? Explain
• YES< activation is the minimum amount of energy needed to start a reaction.
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34./35 How can the rate of a reaction be changed?
• Temperature: you can slow rippening fruit by putting them in a refrigerator. (green tomatoes)
• Increase the temperature will make foods cook faster.
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34/35
• Concentration: the closer reactant atoms and molecules are to each other, the grater the chance they will collide and between them and the faster the reaction rate.
• Concentration: is the amount of a substace present in a given volume
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34/35
• Surface area: the exposed surface area of reactant particles.
• Which is better to start a fire? A large log or small twigs?
• Small twigs WHY?
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36. How does an inhibitor slow a reaction?
• A substance that slows a reaction down.• An inhibitor makes the formation of certain
amounts of product take longer. • Cereal: BHT or butylated hydrxytolune—
increases shelf life and slows the spoiling
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37. What are enzymes?
• Are a catalyst• Are large protein molecules that speed up
reactions needed for your cells to work properly.
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38. How is heat energy transferred across particles in a reaction?
• Think about going outside… particle movement
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39. How is matter conserved in a chemical reaction?
• This will be answered in class… on Friday.
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