Name__________________
Convert:
(1) 9.25 m = __________ km (2) 45 g = __________ mg
(3) .925 m = __________ cm (4) .0455 kg = __________ g
5. One reason why water is considered to be one of the most rare
and unusual substances in the universe is (pick one):
(a) it is composed of atoms, bonded into molecules
(b) its molecules are attracted to each other
(c) it expands when it freezes
(d) it has a definite boiling point and a definite melting
point.
6. Suppose an unknown liquid demonstrates the Tyndall effect, but
cannot be separated by filtering. It's a (pick one):
(a) suspension (b) colloid (c) solution (d) coagulate
7. Suppose you are given a liquid, and are told that it's a
SUSPENSION. What are two properties the solution ought to have
(that distinguish it from other types of mixtures)?
8. Josie was doing a lab to find the density of a metal. Here's
her data:
mass of empty beaker: 29.55 grams
mass of beaker PLUS metal sample: 44.36 grams
volume of the metal sample: 4.2 mL
Use her data to find the density of the metal sample.
9. Name two pieces of safety equipment you should use whenever
you're using your bunsen burner.
10. Name two pieces of safety equipment you should use whenever
you're handling an unfamiliar chemical.
Use your periodic chart - find the symbols for each of these:
(11) Potassium (12) praseodymium (13) mercury
14. What substance is the dispersant in milk?
15. At what temperature (degrees C) can BOTH the liquid AND the
solid phase of water be present?
16. What is a fundamental difference between an element and a
compound?
17. In a mixture of salt dissolved in water: the solute is:
(a) the salt (b) the water
(c) separated by filtering (d) the precipitate
18. Which of the following changes are chemical changes? (List
the letters of the chemical changes on your answer sheet. There's
more than one.)
(a) breaking glass (f) photosynthesis
(b) decomposition of (g) evaporating alcohol
hydrogen peroxide
(c) bending metal (h) dissolving of ammonium chloride
in water
(d) rusting of steel (i) burning paper
(e) dissolving sugar in water
19. Are colloidal particles large enough to be seen under a
microscope? (pick one.)
(a) yes (b) no (c) there's no way to tell
20. Suppose you are given a liquid, and are told that it's a
SOLUTION. What are two properties the solution ought to have
(that distinguish it from other types of mixtures)?
21. Why is water not classified as an element?
22. What links the atoms together in a water molecule?
23. Recall the experiment called Water Testing. When we did the
Fe3+ test, the control solution (pick one):
(a) did contain the Fe3+ ion
(b) did not contain the Fe3+ ion
(c) may or may not have contained the Fe3+ ion
(d) contained the precipitate
24. Convert: .925 mL = __________cm3
25. A box has these dimensions:
length: .00337 kilometers
width: .850 meters
height: 126 mm
Find the volume of this box.
26. What becomes of most of the water removed from a river for
irrigation purposes?
27. The density of ice is ______ the density of liquid water.
(a) greater than (b) equal to
(c) less than (d sometimes greater than, and sometimes
less than
28. A vitamin supplement that contains 0.06 grams of vitamin C
supplies 100% of the RDA (recommended daily allowance). This
mass of vitamin C could also be expressed as:
(a) 6 mg (b) 60 mg (c) 600 mg (d) .006 kg
29. Suppose you are stranded, with no source of water or food.
Which one of the following items would be the most important for
you to have with you to insure your survival for three or four
days?
(a) a kilogram of peanuts (b) 10 liters of pure water
(c) a package of flares (d) a portable toilet
30. Suppose the water supply in Livermore Falls happens to have a
funny odor. Suppose this odor is not dangerous - just annoying.
What type of treatment step could be taken to remove this odor?
31. What type of organism is eaten by zooplankton?
32. The addition of which element seems to trigger algae blooms
in lakes in Maine?
Use your periodic chart to answer these questions:
(33) Which element has the symbol Sn?
(34) What's the symbol for the element tungsten?
(35) What's the atomic weight of the element magnesium?
(36) What's the melting point of the element aluminum?
(37) What's the atomic volume of the element hydrogen?
This is...
a TEST over CHEMCOM Unit IB
Questions? Comments??
Bob
Clark
Livermore Falls High
School
Livermore falls, Maine 04254