c127e1p1f2000

1. Classify each of the following:
   1. Air

      Heterogeneous Mixture Homogeneous mixture Element Pure Compound

   2. Granulated Magnesium

      Heterogeneous Mixture Homogeneous mixture Element Pure Compound

   3. Crystals of magnesium sulfate

      Heterogeneous Mixture Homogeneous mixture Element Pure Compound

   4. Chicken noodle soup

      Heterogeneous Mixture Homogeneous mixture Element Pure Compound

   5. Consider H₂SO₄.
      1. One can obtain 2 lbs of hydrogen for every 32 lbs of sulfur in H₂SO₄
      2. One can say the the relative mass of the molecule is 98 amu
      3. There are 6.022x10²³ molecules in 98 lbs of H₂SO₄
      4. One molecule of H₂SO₄ has a mass of 98 g

      All of the statements are correct None of the statements are correct Statements (1), (2) and (3) are correct Statements (1) and 2) are correct Only statement (1) is correct

   6. There are two known isotopes of Surprisium, the element of surprise. ³³⁰Su has a natural abundance of 75%. If the atomic mass on the periodic table is 329.25 then the mass of the second isotope is

      325 327 328 329 331

   7. What is the average mass (in grams) of one atom of lithum?
      1. 1.153x10^-23
      2. 4.981x10^-24
      3. 3
      4. 6.941
      5. 8.676x10²²

      1 2 3 4 5

   8. Metal ion A³⁺ adheres (i.e., sticks) to filter paper more strongly than does the meta ion B³⁺. In a apaper chromatography experiment separating the two ions, which of the following statemenst would be true?
      1. Metal ion A³⁺ would travel faster than B³⁺ and have the larger R_f value
      2. Metal ion A³⁺ would travel slower than B³⁺ and have the smaller R_f value
      3. Metal ion A³⁺ would travel slower than B³⁺ and have the larger R_f value
      4. Metal ion A³⁺ would travel faster than B³⁺ and have the smaller R_f value
      5. It is impossible to predict which ion will travel faster and have the larger R_f value

      1 2 3 4 5

   9. In determining the density of an unknown liquid (Experiment 1) a student failed to wipe off the outside of the flask after the student filled it with water. There were water droplets left on the flask. Assuming no other errors in the experiment, what would be the likely effect of this error on the density of the unknown liquid?

      The calculated density would be larger than the actual density The calculated density would be smaller than the actual density The error described would be so small as to be negligible The error could either increase or decrease the calculated density depending on its magnitude There would be no effet on the calculated density

2. 1. The electron has all the properteis of the element. True False
   2. Neutrons have no change and no mass True False
   3. When an atom loses electrons, it becomes positively charged True False
   4. Alpha particles are identical to helium atoms True False
   5. The simplest formula for C₆H12O₆ is CH₂O True False
   6. For the compound lithium chloride, the chloride ions are cations. True False
   7. Uncharged isotopes of the same element always have the same number of electrons True False
   8. The proton is found in the nucleus of the atom True False The mass number of an element represents the number of neutrons in the nucleus of that element True False ³²P and ³²S have the same neutron to proton (n/p⁺) ratio True False
3. Write formula for the following compounds:
   1. Carbon tetrabromide
   2. copper (II) hypochlorite
   3. potassium sulfide
   4. ammonia
   5. sodium dichromate
4. Name each of the following compounds:
   1. NiCO₃
   2. HNO₂(aq)
   3. SF₆
   4. CH₄
   5. H₂O₂
5. Write the answers to the following:
   1. ₁₂²⁵Mg²⁺ has (1) protons and (2) neutrons and (3) electrons
   2. Period (4) has no metals
   3. The symbol for the metallod in Group 13 is (5)
   4. The name of teh froup to which sodium belongs is (6)
   5. The name of the group to which neon belongs is (7)
   6. The name of the halogen with 35 protons in its nucleus is (8)
   7. If a new alkaline earth were created, its atomic number ould most probably be (9)
   8. The symbol for a metal that has 36 electrons and whose cation has a +2 charge is (10)
   9. (11) is the name of a post transition metal in Period 4.
   10. (12) i9s the name of a molecule made up of two atoms of an element in Group 6, Period 2.

What are your answers? After you have chosen answers (above) press the Submit button to have them graded.

Query, are the (above) answers correct?