C832 Chemistry with Lab
Access The Exact Questions for C832 Chemistry with Lab
💯 100% Pass Rate guaranteed
🗓️ Unlock for 1 Month
Rated 4.8/5 from over 1000+ reviews
- Unlimited Exact Practice Test Questions
- Trusted By 200 Million Students and Professors
Starting from
$30/month
What’s Included:
- Unlock 100 + Actual Exam Questions and Answers for C832 Chemistry with Lab on monthly basis
- Well-structured questions covering all topics, accompanied by organized images.
- Learn from mistakes with detailed answer explanations.
- Easy To understand explanations for all students.
Access and unlock Multiple Practice Question for C832 Chemistry with Lab to help you Pass at ease.
Free C832 Chemistry with Lab Questions
1. Which substance is nonpolar despite having polar bonds?
- a) HF
- b) CCl₄
- c) NH₃
- d) SO₂
Explanation
Although each C–Cl bond in carbon tetrachloride (CCl₄) is polar due to the electronegativity difference between carbon and chlorine, the molecule’s tetrahedral symmetry causes the bond dipoles to cancel out. As a result, there is no net dipole moment, and the molecule is overall nonpolar. In contrast, HF, NH₃, and SO₂ all have net dipoles because of their asymmetrical structures.
Correct Answer: CCl₄
Correct Answer: CCl₄
2. What type of reaction is 2H₂O₂ → 2H₂O + O₂?
- Single replacement
- Decomposition
- Synthesis
- Combustion
Explanation
Explanation:
This reaction is a decomposition reaction because hydrogen peroxide (H₂O₂) breaks down into simpler substances—water (H₂O) and oxygen gas (O₂). Decomposition reactions occur when one compound breaks apart into two or more simpler products, typically requiring energy input such as heat, light, or a catalyst. This process demonstrates the breakdown of a single compound into its basic components.
Correct Answer:
Decomposition
This reaction is a decomposition reaction because hydrogen peroxide (H₂O₂) breaks down into simpler substances—water (H₂O) and oxygen gas (O₂). Decomposition reactions occur when one compound breaks apart into two or more simpler products, typically requiring energy input such as heat, light, or a catalyst. This process demonstrates the breakdown of a single compound into its basic components.
Correct Answer:
Decomposition
3. How many grams of NaCl are produced from 2.5 moles of Cl₂ in the reaction 2Na + Cl₂ → 2NaCl?
- a) 73.0 g
- b) 146.0 g
- c) 292.0 g
- d) 58.5 g
Explanation
From the balanced equation, 1 mole of Cl₂ produces 2 moles of NaCl. Therefore, 2.5 moles of Cl₂ produce 5.0 moles of NaCl. The molar mass of NaCl is 58.5 g/mol. Thus, 5.0 moles × 58.5 g/mol = 292.5 g of NaCl. Rounded appropriately, the answer is 292.0 g.
Correct Answer: 292.0 g
Correct Answer: 292.0 g
4. A central atom with 3 electron domains and 1 lone pair (AX₂E) has molecular geometry:
- Linear
- Bent
- Trigonal planar
- Trigonal pyramidal
Explanation
Explanation:
A central atom with three regions of electron density and one lone pair (AX2E) has a trigonal planar electron geometry but the molecular geometry is bent. The lone pair occupies more space than a bonding pair, causing the bond angle between the two bonded atoms to be slightly less than 120°. This results in a bent or V-shaped molecular geometry.
Why the other options are incorrect:
Linear is for AX2 without lone pairs; trigonal planar for AX3; trigonal pyramidal for AX3E.
A central atom with three regions of electron density and one lone pair (AX2E) has a trigonal planar electron geometry but the molecular geometry is bent. The lone pair occupies more space than a bonding pair, causing the bond angle between the two bonded atoms to be slightly less than 120°. This results in a bent or V-shaped molecular geometry.
Why the other options are incorrect:
Linear is for AX2 without lone pairs; trigonal planar for AX3; trigonal pyramidal for AX3E.
5. The bond angle in a molecule with AX₂E₂ VSEPR notation is approximately:
- a) 90°
- b) 104.5°
- c) 109.5°
- d) 120°
Explanation
The AX₂E₂ molecular geometry corresponds to two bonding pairs and two lone pairs on the central atom, as in H₂O. The electron geometry is tetrahedral, but the presence of two lone pairs compresses the bond angle from 109.5° to about 104.5°. This results in a bent molecular shape with a bond angle close to 104.5°.
Correct Answer: 104.5°
Correct Answer: 104.5°
6. What mass of oxygen is needed to burn 32 g of CH₄ completely?
- 64 g
- 32 g
- 128 g
- 16 g
Explanation
Explanation:
The combustion reaction is CH₄ + 2 O₂ → CO₂ + 2 H₂O. One mole of CH₄ (16.0 g) requires 2 moles of O₂ (2 × 32.0 g = 64.0 g). For 32 g CH₄ you have 32 / 16 = 2.0 moles of CH₄, so you need 2.0 × 2 = 4.0 moles O₂. Mass of O₂ = 4.0 mol × 32.0 g/mol = 128.0 g.
Correct Answer: 128 g
Why the other options are incorrect:
64 g for 1 mole CH₄; 32 g is O₂ molar mass; 16 g is CH₄ molar mass.
The combustion reaction is CH₄ + 2 O₂ → CO₂ + 2 H₂O. One mole of CH₄ (16.0 g) requires 2 moles of O₂ (2 × 32.0 g = 64.0 g). For 32 g CH₄ you have 32 / 16 = 2.0 moles of CH₄, so you need 2.0 × 2 = 4.0 moles O₂. Mass of O₂ = 4.0 mol × 32.0 g/mol = 128.0 g.
Correct Answer: 128 g
Why the other options are incorrect:
64 g for 1 mole CH₄; 32 g is O₂ molar mass; 16 g is CH₄ molar mass.
7. Which group of elements is listed in increasing order of first ionization energy?
- Na, S, Cl, Ar
- Ar, Cl, S, Na
- Ar, Cl, P, Na
- S, Na, Cl, Ar
Explanation
Explanation:
First ionization energy is the energy required to remove the outermost electron from an atom in its gaseous state. Ionization energy increases across a period from left to right and decreases down a group in the periodic table. Among the given options, sodium (Na) has the lowest ionization energy because it is an alkali metal, while argon (Ar), a noble gas, has the highest because of its stable electron configuration. Thus, the correct increasing order is Na, S, Cl, Ar — moving from the lowest to the highest ionization energy across Period 3.
Why the other options are incorrect:
The other options reverse the order across the period or mix elements incorrectly, resulting in decreasing or non-increasing sequences.
First ionization energy is the energy required to remove the outermost electron from an atom in its gaseous state. Ionization energy increases across a period from left to right and decreases down a group in the periodic table. Among the given options, sodium (Na) has the lowest ionization energy because it is an alkali metal, while argon (Ar), a noble gas, has the highest because of its stable electron configuration. Thus, the correct increasing order is Na, S, Cl, Ar — moving from the lowest to the highest ionization energy across Period 3.
Why the other options are incorrect:
The other options reverse the order across the period or mix elements incorrectly, resulting in decreasing or non-increasing sequences.
8. Which electron configuration correctly represents an atom of nitrogen?
- 2s²2p⁵
- 1s²2s²2p⁷
- 1s²2s²2p³
- 1s²2s²3s²2p¹
Explanation
Explanation:
Nitrogen has an atomic number of 7, meaning it has 7 electrons. The proper way to fill its orbitals is according to the Aufbau principle: electrons fill lower energy levels first. Therefore, the configuration is 1s² (2 electrons), 2s² (2 electrons), and 2p³ (3 electrons), totaling 7.
Why the other options are incorrect:
Configurations like 2s²2p⁵ or 2p⁷ exceed the number of electrons nitrogen possesses and are not possible. The option with 3s² includes higher orbitals incorrectly for nitrogen.
Nitrogen has an atomic number of 7, meaning it has 7 electrons. The proper way to fill its orbitals is according to the Aufbau principle: electrons fill lower energy levels first. Therefore, the configuration is 1s² (2 electrons), 2s² (2 electrons), and 2p³ (3 electrons), totaling 7.
Why the other options are incorrect:
Configurations like 2s²2p⁵ or 2p⁷ exceed the number of electrons nitrogen possesses and are not possible. The option with 3s² includes higher orbitals incorrectly for nitrogen.
9. Which molecule contains a triple bond in its Lewis structure?
- a) H₂O
- b) CO₂
- c) N₂
- d) CH₄
Explanation
A triple bond involves the sharing of three pairs of electrons between two atoms. Among the options, nitrogen gas (N₂) is composed of two nitrogen atoms connected by a triple bond, represented as N≡N. In contrast, CO₂ contains double bonds, CH₄ has only single bonds, and H₂O has single bonds between hydrogen and oxygen.
Correct Answer: N₂
Correct Answer: N₂
10. The Heisenberg uncertainty principle states that it is impossible to simultaneously know which two things about an electron?
- Speed and energy
- Mass and charge
- Position and momentum
- Spin and orientation
Explanation
Explanation:
The Heisenberg uncertainty principle is a fundamental concept in quantum mechanics which states that it is impossible to determine both the exact position and momentum of an electron at the same time. The more precisely one of these properties is known, the less precisely the other can be known. This principle reflects the wave-particle duality of matter and the limits of measurement at the quantum level. It means that instead of fixed orbits, electrons exist in regions of probability where they are likely to be found.
Why the other options are incorrect:
The other pairs of properties can be known simultaneously or are not subject to this uncertainty.
The Heisenberg uncertainty principle is a fundamental concept in quantum mechanics which states that it is impossible to determine both the exact position and momentum of an electron at the same time. The more precisely one of these properties is known, the less precisely the other can be known. This principle reflects the wave-particle duality of matter and the limits of measurement at the quantum level. It means that instead of fixed orbits, electrons exist in regions of probability where they are likely to be found.
Why the other options are incorrect:
The other pairs of properties can be known simultaneously or are not subject to this uncertainty.
How to Order
1
Select Your Exam
Click on your desired exam to open its dedicated page with resources like practice questions, flashcards, and study guides.Choose what to focus on, Your selected exam is saved for quick access Once you log in.
2
Subscribe
Hit the Subscribe button on the platform. With your subscription, you will enjoy unlimited access to all practice questions and resources for a full 1-month period. After the month has elapsed, you can choose to resubscribe to continue benefiting from our comprehensive exam preparation tools and resources.
3
Pay and unlock the practice Questions
Once your payment is processed, you’ll immediately unlock access to all practice questions tailored to your selected exam for 1 month .