C832 Chemistry with Lab
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Free C832 Chemistry with Lab Questions
The correct formula for ammonium phosphate is:
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NH₄PO₄
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(NH₄)₃PO₄
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NH₄(PO₄)₃
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(NH₄)₂PO₄
Explanation
The correct formula for ammonium phosphate is (NH₄)₃PO₄. The ammonium ion (NH₄⁺) carries a +1 charge, and the phosphate ion (PO₄³⁻) carries a -3 charge. To balance the charges, three ammonium ions are required for each phosphate ion, resulting in the formula (NH₄)₃PO₄. This compound is commonly used as a fertilizer due to its high nitrogen and phosphorus content.
Correct Answer: (NH₄)₃PO₄
The acronym "PASS" gives instructions on how to use the fire extinguisher. What does the acronym "PASS" stand for?
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Pull, Aim, Squeeze, Sweep
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Push, Alert, Spray, Secure
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Pull, Adjust, Spray, Stop
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Press, Aim, Spray, Sweep
Explanation
The formula for magnesium nitride is:
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MgN
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Mg₃N₂
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Mg₂N₃
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MgN₂
Explanation
The correct formula for magnesium nitride is Mg₃N₂. Magnesium forms a +2 ion (Mg²⁺), and nitrogen forms a -3 ion (N³⁻). To balance the charges, three magnesium ions (total +6) combine with two nitrogen ions (total -6), forming the neutral compound Mg₃N₂. This compound is an ionic solid commonly produced when magnesium reacts directly with nitrogen gas.
Correct Answer: Mg₃N₂
What is the name of H₂SO₄?
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Hydrosulfuric acid
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Sulfuric acid
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Sulfurous acid
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Hydrogen sulfate
Explanation
The correct name for H₂SO₄ is sulfuric acid. This acid is derived from the sulfate ion (SO₄²⁻) and follows the naming convention for oxyacids: when the polyatomic ion ends in “-ate,” the acid name ends in “-ic.” Thus, “sulfate” becomes “sulfuric.” Sulfuric acid is a strong acid widely used in fertilizers, batteries, and industrial chemical processes.
Correct Answer: Sulfuric acid
A student's clothing catches fire from the flame of a "Bunsen" burner. What should you do first?
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Tell the student to stop, drop, and roll.
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Use a paper towel to pat out the flames.
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Run to get water from the sink.
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Tell the student to wave their arms to extinguish the fire.
Explanation
If a student’s clothing catches fire, the immediate and correct action is to tell the student to stop, drop, and roll. This technique cuts off the oxygen supply to the flames and helps extinguish the fire quickly.
Why the other options are incorrect:
Running or waving arms fans the flames and can worsen the burn, while using a paper towel or water from the sink is ineffective and may spread the fire. If available, a fire blanket or safety shower can also be used after the student has dropped to the floor. Quick action and calm instructions are critical to prevent severe injury.
There are three p orbitals that are aligned with their major axes along the x, y, and z axes. What is the origin of these three p orbitals?
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They are the solutions for the three values of the magnetic quantum number.
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They arise from the three possible values of the principal quantum number.
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They come from the three possible spin orientations of an electron.
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They are determined by the three possible energy levels of p orbitals.
Explanation
The three p orbitals (px, py, pz) originate from the three possible values of the magnetic quantum number (mₗ) when the angular quantum number (l) equals 1. For p orbitals, l = 1, and mₗ can take values of −1, 0, and +1. Each value corresponds to a different spatial orientation of the orbital along one of the three axes (x, y, and z). These orbitals are equal in energy (degenerate) in a free atom but can vary slightly when external fields or bonding interactions are present.
Correct Answer:
They are the solutions for the three values of the magnetic quantum number.
0 g of CH₄ reacts completely with excess O₂. What volume of CO₂ at STP is produced?
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22.4 L
Explanation
Why the other options are incorrect: There are no other options provided in the text.
In the reaction N₂ + 3H₂ → 2NH₃, how many moles of NH₃ are produced from 4 moles of H₂?
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2.67 mol
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4 mol
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1.33 mol
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8 mol
Explanation
From the balanced chemical equation, 3 moles of hydrogen (H₂) produce 2 moles of ammonia (NH₃). To find how much NH₃ is produced from 4 moles of H₂, set up a proportion: (2 mol NH₃ / 3 mol H₂) × 4 mol H₂ = 8/3 mol NH₃ = 2.67 mol NH₃. Therefore, 2.67 moles of ammonia are produced from 4 moles of hydrogen gas.
Correct Answer: 2.67 mol
Why the other options are incorrect:
4 mol assumes 1:1 ratio; 1.33 mol is half; 8 mol doubles incorrectly.
Which molecule exhibits sp² hybridization on the central atom?
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CH₄
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SO₃
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PF₅
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SF₆
Explanation
SO₃ (sulfur trioxide) has a central sulfur atom bonded to three oxygen atoms with no lone pairs. The sulfur atom forms three sigma bonds and uses three hybrid orbitals, which corresponds to sp² hybridization. This allows for a trigonal planar geometry with bond angles of approximately 120°.
Why the other options are incorrect:
In contrast, CH₄ is sp³, PF₅ is sp³d, and SF₆ is sp³d² hybridized.
Correct Answer: SO₃
A student cuts his hand on a broken beaker, resulting in significant bleeding. What should you do?
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Make sure the student is safe and call on a medical professional to provide treatment.
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Have the student continue working to avoid disrupting the experiment.
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Rinse the wound quickly and cover it with a dirty cloth.
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Ignore the cut if the bleeding slows down on its own.
Explanation
When a student sustains a significant cut in the laboratory, the priority is to ensure their safety and seek medical assistance immediately. The student should be moved away from the work area, and any active bleeding should be controlled using clean gauze or a sterile dressing while waiting for medical help.
Why the other options are incorrect:
Continuing work, ignoring the injury, or using unclean materials can lead to infection and worsen the condition. Prompt medical attention ensures the wound is properly treated and contamination risks are minimized.
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