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CHEM 121 FINAL EXAM LATEST 2025 /2026 ACTUAL
EXAM WITH COMPLETE QUESTIONS AND CORRECT
DETAILED ANSWERS (100% VERIFIED ANSWERS)
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What are the different levels of energy? - Answer-1s < 2s < 2p < 3s < 3p < 4s < 3d < 4p < 5s < 4d < 5p < 6s A tentative explanation of certain facts that provides the basis for further experimentation is a(n) ___.
- observation
- hypothesis
- law
- theory - Answer-B
Which state of matter consists of particles held together firmly but not rigidly? These particles are held together by strong attractive forces, are in close contact with one another, but are able to flow by one another. 1 / 4
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- liquid
- gas
- solid
- vapoR - Answer-A
Which of the following is a pure substance?
- soil
- table salt
- sea water
- air - Answer-B
Perform the following set of operations and choose the alternative that expresses the result to the proper number of significant figures.((1.5 × 10-4 ) x (61.3)) + 2.01
A. 2.0192
B. 2.0
C. 2.019
- 2.02 - Answer-D
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If you travel to Canada, speed limits are posted in km/hr. For a speed limit of 70. mi/hr, what would be the speed limit posted on a Canadian highway?(1 mile = 1.609 km)
- 72 km/hr
- 110 km/hr
- 44 km/hr
- 68 km/hr - Answer-B
The temperature of 295 K is equal to which Fahrenheit temperature?
A. 32 °F
B. 72 °F
C. 44 °F
- 41 °F - Answer-B
A 48.0-g piece of metal is dropped into 50.0 mL of water in a graduated cylinder. The water level rises to 62.4 mL. What is the density of the metal?
- 12.4 g/mL 3 / 4
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- 0.258 g/ml
- 595 g/ml
- 3.87 g/mL - Answer-D
Which element is solid at room temperature and a good conductor of heat and electricity?
- Phosphorus
- Calcium
- Hydrogen
- Boron - Answer-B
Which element forms a diatomic molecule?
- Neon
- Calcium
- Chlorine
- Sulfur - Answer-C
How many atoms are indicated in the formula Ca3(PO4)2?
- 8
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