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Chem 120 final exam 4 GRADED A+ (ACTUAL EXAM )
Questions and Answers (Solved)
- Exam 1- Which of the following correctly describes a physical change? Burning
a candle, Rusting of iron, Photosynthesis of glucose, Subliming of dry ice.
Answer: Subliming of dry ice
- If someone is conducting a study on trees, the statement "leaves turn color in the
fall b/c the amount of sunlight they receive is reduced is a:
Answer: Hypothesis
- The number of significant figures in the measurement of 45.030 mm is
Answer: Five
- Write the following number in scientific notification to two significant figures:
0.00060 cm
Answer: 6.0 x 10-4 cm
- What is the correct answer to the following expression using the rules for
significant figures?
12.439 + 9.375 - 15.7
Answer: 6.1
- Given the density of gold is 19.3 g/cm3, what volume will 259 g of gold occupy?
Answer: 13.4 cm3
7. Air is considered a:
Answer: Homogeneous Mixture
- On a cold winter day, the temperature is -6.0 °F. What is that temperature in
degrees Celsius?
Answer: -21.1 °C 1 / 2
- How many nutritional calories does the following food product contain? (Picture
of Food label)
Answer: 250.5 Cal
- Which of the following elements is classified as a halogen? Bromine, Hy-
drogen, Rubidium, Argon
Answer: Bromine
- What is the correct atomic symbol for an atom with 30 protons, 30 elec- trons,
and 35 neutrons?
Answer: 65Zn
- What is the electron configuration for the element potassium?
Answer: 2,8,8,1
- The element with the higher ionization energy of the following is Chlorine,
Francium, Sodium, Iodine
Answer: Chlorine
- The heaviest of the following types of radiation is
Answer: ±
- The radioisotope strontium-90 has a half-life of 38.1 years. If a sample contains
36 mg of Sr-90, how many milligrams will remain after 152.4 years?-
Answer: 2.3mg
- What is the correct name for the compound Fe2(SO4)3?
Answer: Iron (III) sulfate
- Which of the following does not exist as a diatomic element naturally?
Answer: - Carbon
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