Matter and Atomic Structure Test

  1. The dyes of the marker pen separated in the chromatography lab because:
    a. of their different solubilities. c. of their different masses.
    b. of molecular bonding. d. of chemical properties.
  2. The chemical component that reacted with HCL in the carbonate lab was:
    a. CO3. c. carbon dioxide gas.
    b. Na. d. Ca.
  3. Because we can not see sugar particles when sugar is dissolved in water, it is a:
    a. heterogeneous mixture. c. homogeneous mixture.
    b. alloy. d. suspension.
  4. The energy put into an ice cube to melt it, is returned when the water is:
    a. vaporized. c. condensing.
    b. frozen. d. none of these.
  5. Are these homogeneous (HOM) or heterogeneous (HET) mixtures?
    1. ____ mayonnaise.
    2. ____ Code Red Mountain Dew®.
    3. ____ pepperoni pizza.
    4. ____ cheese pizza.
  6. Are these physical (PHY) or chemical (CHE) properties?
    1. ____ color
    2. ____ reactions with water
    3. ____ density
    4. ____ mass
    5. ____ melting point
    6. ____ flammability
  7. Are these physical (PHY) or chemical (CHE) changes?
    1. ____ salt dissolving in water.
    2. ____ salt and sugar being mixed together.
    3. ____ railroad tracks rusting.
    4. ____ tearing a piece of paper.
    5. ____ acid combining with carbonate to produce CO2 gas.
  8. For the paper chromatography experiment result that is diagramed on the front board, which dye was more soluble?
    a. blue. c. red.
    b. yellow. d. green.
  9. Are these elements (ELE) or compounds (COM) or mixtures (MIX) ? You have three choices !
    1. ____ the rock on the overhead projector.
    2. ____ uranium
    3. ____ water
    4. ____ Au
    5. ____ CO3
    6. ____ your skin
  10. Atoms of the same element having different numbers of neutrons are called:
    a. late for dinner. c. isotopes.
    b. isomers. d. metals.
  11. In a neutral atom, the number of protons equals the number of :
    a. particles c. electrons
    b. neutrons d. positrons
  12. Elements in the same group have the same ?
  13. Elements in the same period have the same ?
  14. The reason we would round an element's atomic mass to the nearest integer is to:
    a. speed our calculations. c. determine the number of electrons.
    b. determine the mass number of the common isotope. d. determine the atomic weight.
  15. Compared to electrons in an inner shell, the outer shell electrons have:
    a. more speed c. less mass
    b. greater chemical power. d. more energy.
  16. What element is in group 4A, period 2?
  17. Find silicon on the periodic table. How many protons are in silicon?
  18. What is the atomic number of silicon?
  19. What is the atomic mass of silicon?
  20. What is the symbol for silicon?
  21. How many neutrons are in the most common isotope of silicon?
  22. In what group is silicon ?
  23. In what period is silicon?
  24. On the back draw a Bohr diagram and a Lewis diagram for silicon. LABEL WHICH IS WHICH!