DHORT : Discover Health Occupations Readiness Test Exam

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Question: 97
What property of a metal refers to its ability to be hammered into sheets?
1. Ductility
2. Thermal conductivity
3. Electrical conductivity
4. Malleability
5. Density
Answer: D
Malleability refers to a metal's ability to be hammered into sheets.
Question: 98
Which of the following elements is most easily oxidized?
1. Nitrogen
2. Fluorine
3. Lithium
4. Neon
5. Sulfur
Answer: C
Easily oxidized elements readily release electrons. The loss of an electron allows these elements to form a stable valence electron configuration. In the context of this question, lithium is the most willing to release an electron, so it is the most easily oxidized.
Question: 99
The hamstrings are responsible for flexing which joint?
1. Knee
2. Hip
3. Shoulder
4. Elbow
Answer: A
The hamstrings are responsible for flexing the knee joint. The hamstrings consist of biceps femoris, semimembranosus and semitendinosus. They also assist in knee rotation.
Question: 100
What type of bonding does a molecule of NaCl display?
1. Ionic
2. Polar covalent
3. Nonpolar covalent
4. Metallic
5. Covalent metallic
Answer: A
NaCl is composed of two ions, Na+ and Cl-. Therefore, the molecule displays ionic bonding.
Question: 101
Which of the following compounds is classified as a metallic oxide?
1. H2O
2. Na2O
3. CO2
4. NO2
5. SO2
Answer: B
Metallic oxides consist of an oxygen atom bound to a metal. The only metal present in this question is sodium, so Na2O must be a metallic oxide.
Question: 102
A saturated solution of NaCl is heated until more solute can be dissolved. How is this solution best described?
1. Dilute
2. Immiscible
3. Supersaturated
4. Unsaturated
5. Hydrophobic
Answer: C
When a saturated solution is heated so more solute can be dissolved, the solution is described as supersaturated. Supersaturated solutions are typically unstable, and the solute can crash out of solution if a seed crystal is provided.
Question: 103
A 40.0 gram sample of a radioactive element decays to 5.0 grams in 15 hours. What is the half-life of this element?
1. 3 hours
2. 2 hours
3. 6 hours
4. 7.5 hours
5. 5 hours
Answer: E
In 15 hours, this substance has decayed to 1/8 of its original mass. In other words, the substance has progressed through three half-lives (1/2 x 1/2 x 1/2 = 1/8). Thus, a single-half life for this substance is 5 hours.
Question: 104
Which of the following compounds contains a double bond?
1. C2H6
2. C2H4
3. C3H8
4. CH4
5. C4H10
Answer: B
Hydrocarbons with the formula CnH2n contain double bonds. The only compound with this formula, C2H4, must contain a double bond.
Question: 105
What is the duodenum responsible for?
1. Breaking down food in the small intestines
2. Cleans the blood
3. Creates bile
4. Absorbs oxygen
Answer: A
The duodenum is responsible for breaking down food in the small intestines.
Question: 106
80.0 grams of NaOH is dissolved in 3.0 moles of H20. What is the mole fraction
of NaOH in this solution?
1. .20
2. .37
3. .40
4. .64
5. .79
Answer: C
The mole fraction for a compound indicates (moles of given compund) / (total moles of system). In this question, there are two moles of NaOH and five total moles in the system. Thus, the mole fraction is expressed as 2/5, or .40.

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