1st Six Weeks Review

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1st Six Weeks Review

• Chemistry

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1. What are the 4 parts of Daltons Atomic Theory?

• All matter is made up of atoms
• Atoms cannot be divided
• Atoms combine in whole ratios (12, 23, etc)
  to form compounds
• Compounds react to form new substances during
  reactions

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2. Describe J.J. Thompsons contribution to
atomic theory and find a picture to illustrate it.

• Discovered the Electron
• Used Cathode Ray tube experiment

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3. Describe Ernest Rutherfords contribution to
atomic theory and find a picture to illustrate it.

• Discovered the nucleus
• Used the gold foil experiment shooting alpha
  particles at gold foil- some particles went
  through, some bounced off in all directions.

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4. Describe Niels Bohrs contribution to atomic
theory and find a picture to illustrate it.

• Proposed the planetary model of the atom
• Described Electron energy levels

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5. Describe Eugene Goldsteins contribution to
atomic theory find a picture to illustrate it.

• Discovered the proton
• Particles going opposite electrons in cathode ray
  tube.

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6. Describe James Chadwicks contribution to
atomic theory find a picture to illustrate it.

• Discovered Neutrons

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7. Describe Erwin Schrodinger contribution to
atomic theory find a picture to illustrate it.

• Proposed the Quantum Mechanical Model
• Orbitals predict location of electrons
• Electrons in energy levels
• Currently accepted atom model

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8. Find a picture 3 statements that describe a
proton.

• Positive charge
• Mass 1 amu or 1.67 x 10-24g
• Found in the nucleus

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9. Find a picture 3 statements that describe a
neutron.

• Neutral charge
• Mass 1 amu or 1.67 x 10-24g
• Found in the nucleus

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10. Find a picture 3 statements that describe
an electron.

• Negative charge
• Mass .0005 amu or 9.11 x 10-28g
• Moving rapidly around nucleus

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11. True or False The nucleus contains most of
the atoms volume.

• False!
• The nucleus contains most of the atoms mass.
• The electron cloud contains most of the atoms
  volume.

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12. Illustrate an element square from the
periodic table label the information it
provides.
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13. True or False Most of the volume of an atom
is occupied by the electron cloud.

• True!

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14. A neutral carbon atom has how many protons,
neutrons electrons?

• Protons 6
• Neutrons 6
• Electrons 6
• Total subatomic particles ?

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15. Magnesium is classified which of the
following solution, alloy, mixture or pure
substance?

• Pure substance!

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16. What is an isotope?

• Isotope is atom of the same element that has the
  same of protons, but a different of neutrons

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17. What are the three isotopes of hydrogen? How
many protons, neutrons electrons does each one
have?

• Protium Deuterium Tritium
• Protons 1 1 1
• Neutrons 0 1 2
• Electrons 1 1 1
• Atomic Mass 1 amu 2 amu 3 amu

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18. For the isotope Nitrogen-15, how many
subatomic particles are present?(protons,
neutrons, electrons)

• Total 22particles
• Atomic 7 (7 p, 7e-)
• Atomic mass 15 (15-7 8 neutrons)

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19. Potassium has an atomic number 19 and an
atomic mass of 39. How many protons, neutrons and
electrons does it have?

• Protons 19
• Electrons 19
• Neutrons 39 19 20

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20. What is average atomic mass? How do you
calculate it?

• Weighted average of the naturally occuring
  isotopes of that element.
• To calculate
• 1. Convert to decimal
• 2. Multiply decimal by mass of isotope
• 3. Add numbers to complete average

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21. What is the average atomic mass of silver?

• .5186 x 106.9amu 55.438
• .4814 x 108.9amu 52.424
•  107.9 amu

• Extra Practice
• http//www.algebralab.org/practice/practice.aspx?f
  ilealgebra_averageatomicmass.xml

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22. Classify each of the following as an element,
compound or mixture

• Sulfur - Element
• Salad oil - Mixture
• Newspaper - Mixture
• Orange - Mixture
• MgCl2 - Compound
• Cardboard - Mixture
• Apple juice - Mixture

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23. What is density and how do you calculate it?

• Density is the amount of matter in a given volume
  of substance.
• m m
• D V m DV V D

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24. Visit the following sitehttp//www.explorele
arning.com/

• Type Density in the Search Bar.
• Click on Density Laboratory.
• Click on Gizmo above the picture.
• Move objects onto the scale into the cylinder
  calculate the density to predict if the object
  will sink or float.

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25. Give 4 examples and a picture of physical
changes.

• Cutting
• Mixing
• Molding
• Evaporating
• Distillation
• Freezing
• Condensing

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26. Give 4 examples and a picture of chemical
changes.

• Burning
• Exploding
• Neutralizing
• Corroding
• Rusting

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Draw lines to match the following

• 1. Electron a. neutral particle w/mass of 1.67 x
  10-24 g
• 2. Proton b. particle w/ mass of 9.11 x 10-28
  g
• 3. Neutron c. particle w/ mass of 1.67 x 10-24
  g
• 4. Heterogeneous d. sample with uniform
  definite composition
• 5. Homogeneous e. physical blend of 2 or more
  substances
• 6. Mixture f. uniform mixture
• 7. Element g. substance that can be chemically
  separated
• 8. Compound h. simplest form of a substance
• 9. Pure substance i. mixture that is not uniform
  throughout