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2. Solve the problem to the correct # of significant figures with rounding:
3. Convert 17.23 mol Ag to atoms Ag
4. Density Calculate the volume of a sample of ethanol if its density is 0.789 g/mLand has a mass of 6.26 g?
5. Atoms and Ions
a. Determine # of electrons, protons, and neutrons.
Protons Electron Neutrons Z A
Os - 188 _______ ______ _______ ______ ________
______ ______ ________ _______ ________
52Mn3+ ______ ______ ________ _______ ________
b. Is Co2+ a cation or anion? _______________________
p = ______ e- = ______
6. Periodic Table. Match the element with the class or group.
a. Convert 11.3 g Ca to mol Ca
b. Convert 0.4218mol Cd to g Cd
8. Classification of matter.
9. History of the Atom
a. Which was the first particle (proton, neutron, or electron) to be discovered ? Electron
b. Match the instrument to what it was used to discover: Electron or Proton
Oil drop experiment ___________
Cathode ray tube ____________
Gold Foil experiment ___________
c. Match the scientist to the particle he worked with: Proton or Electron or Neutron
Rutherford ___________
Chadwick ___________
Thomson ___________
Millikan ____________
d. Write the scientist with the instrument he used: Millikan, Thomson, Rutherford
Oil drop ____________________
Gold foil ____________________
Cathode ray _________________
Proton and model of atom _______________________________
Neutron _______________________________
Charge of the electron _______________________
Mass to charge ratio of the electron ________________________
Multiple Choice. You can just write # and then letter answer
1) A substance that can't be chemically broken down into simpler substances is
A) a homogeneous mixture.
B) an element.
C) a heterogeneous mixture.
D) a compound.
E) an electron.
2) A physical change
A) occurs when iron rusts.
B) occurs when sugar is heated into caramel.
C) occurs when glucose is converted into energy within your cells.
D) occurs when water is evaporated.
E) occurs when propane is burned for heat
3) Which of the following are examples of a chemical change?
A) coffee brewing
B) water freezing
C) leaves turning color in the fall
D) salt dissolves in water
E) None of the above are chemical changes.
4) Isotopes differ in the number of ________.
A) beta particles
B) protons
C) electrons
D) neutrons
5) In a chemical reaction, matter is neither created or destroyed. Which law does this refer to?
A) Law of Definite Proportions
B) Law of the Conservation of Mass
C) Law of Modern Atomic Theory
D) Law of Multiple Proportions
E) First Law of Thermodynamics
6) Ions differ in the number of
A) electrons.
B) neutrons.
C) protons.
D) neutrons and protons.
E) electrons and protons.
7) Predict the charge that an ion formed from nitrogen would have.
A) 1-
B) 6+
C) 3-
D) 4+
E) 2-
8) Give the number of protons in Na+1.
A) 10
B) 13
C) 9
D) 11
E) 12