General Chemistry 101.001 EXAM 1
Section A Vocabulary
Match each word with its correct definition (14 points)
_______ 1. Physical Change A. A way of representing the
composition of a compound/substance.
_______ 2. Theory B. Electrically charged atoms or groups of
atoms.
_______ 3. Element C. Substances being transformed into
different substances.
_______ 4. Periodic Table D. A mixture where the properties are the
same thoughout.
_______ 5. Atom E. Substances composed of only one type of
atom.
_______ 6. Chemical Compound F. A change in physical properties of a
compound/substance.
_______ 7. Heterogeneous Mixture G. A tentative explanation or prediction of
experimental observations.
_______ 8. Extensive Properties H. Depends on amount of
compound/substance present.
_______ 9. Chemical Formula I. An organizal system of all known
elements.
_______ 10. Hypothesis J. Doesn’t depend on the amount if
compound/substance.
_______ 11. Homogenous Mixture K. Smallest component of an element
having the chemical properties of the element.
_______ 12. Intensive Properties L. A mixture where there are different
regions with varying properties.
_______ 13. Chemical Change M. A set of statements or principles
devised to explain a group of facts or phenomena.
_______ 14. Ion N. A substance composed of two or
more different elements.
Define the following terms (12 points)
Qualitative
Quantitative
Precision
Accuracy
Section B General Questions
1. Correctly place the following steps of the Scientific Method in order from first to last using 1 for the first step to 6 for the last step. (6 points)
______ Summarize results and replicate
______ Formulate a Hypothesis
______ Pose a reasonable question
______ Communicate results with the scientific community
______ Collect date from experiments
______ Formulate a Theory
2. Give the three states of matter. (3 points)
3. List three physical properties you can numerically measure. (3 points)
SECTION C Numerical Data Handling
Give the correct number of Significant Figures in each of the following measurements. (6 points)
________ 1. 3.45 g
________ 2. 0.02 mL
________ 3. 0.00670 cm
________ 4. 81000 g
________ 5. 69.003 dm3
________ 6. 50200.0 kg
Convert the following measurements from Decimal Notation to Scientific Notation. (4 points)
1. 0.000009 g ________________________
2. 346700 L ________________________
3. 205 mol ________________________
4. 0.01402 s ________________________
Convert the follow numbers from Scientific Notation to Decimal Notation. (4 points)
1. 3.025 x 103 ________________________
2. 8 x 10-5 ________________________
3. 16.05 x 10-4 ________________________
4. 0.71 x 102 ________________________
Correctly answer the following problems in the correct number of significant figures. (6 points)
1. (110.7-64) = ___________________
(0.056)(0.00216)
2. (1.68) x (23.56-2.305) = ___________________
1.248
SECTION D PROBLEM SOLVING
1. Classify the following as a physical change or chemical change. (5 points)
a. disgestion of food ________________
b. smashing a car against a tree ________________
c. fermentation to produce beer ________________
d. dissolving sugar into water ________________
e. rusting of iron ________________
2. Determine whether each of the following properties is extensive or
intensive. (5 points).
a. length _________________
b. volume _________________
c. temperature _________________
d. density _________________
e. mass _________________
3. The density of glycerine is 1.26 g/mL. Calculate the mass in grams of
400 mL of glycerine. Show prodecure. (4 points)
4. Convert 25°F to a) Celsius and b) Kelvins. Show prodecure. (4 points)
a.
b.
5. A marathon runner covers a distance of 40.0 km. a) What is the distance in
meters? b) In miles? (4 points)
a.
b.
EXTRA CREDIT (4 points)
Three liquids of different densities are mixed together. Because they are not miscible they form discrete layers,one on top of the other. The liquids are carbon tetrachloride (CCl4, d = 1.58 g/cm3), mercury (d = 13.456 g/cm3) and water (d = 1.00 g/cm3). A) Identity what type of mixture this is. B) If you have (blank) grams of CCl4 and (blank) cm3 of of water, how many grams of mercury are in a mixture with a (blank) number of mL?
(blank) cm3 = (blank) mL