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Quizzes > Science

How Many Carbonyl Oxygen Lone Pairs? Quiz

Quick, free oxygen lone pairs quiz with instant results and brief explanations.

Editorial: Review CompletedCreated By: Katrin KesslerUpdated Aug 25, 2025
Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
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This short quiz helps you check how many lone pairs sit on a carbonyl oxygen and why. For a quick refresh, review the oxygen electron configuration, practice shapes in the molecular geometry quiz, and sharpen rules with a vsepr theory quiz. Get instant feedback and clear answers so you can tackle similar questions fast.

Which planet is known as the Red Planet?
Mars
Earth
Venus
Jupiter
Mars is called the Red Planet because its surface is rich in iron oxide, which gives it a reddish appearance. It is the fourth planet from the Sun and one of the most studied planets in our solar system. Its thin atmosphere is dominated by carbon dioxide and dust storms often cover the entire planet. For more details, see .
What is the chemical symbol for water?
O2
CO2
H2
H2O
Water is composed of two hydrogen atoms and one oxygen atom, giving it the molecular formula H2O. This arrangement allows for hydrogen bonding, which is responsible for many of water's unique properties. The chemical symbol H2O is universally used in chemistry and biology. For more information, see .
What part of the cell contains the genetic material?
Ribosome
Mitochondria
Cytoplasm
Nucleus
The nucleus is the membrane-bound organelle that houses the cell's genetic material in the form of DNA. It controls gene expression and mediates the replication of DNA during the cell cycle. Prokaryotic cells lack a nucleus, but in eukaryotes it is essential for complex cellular functions. Learn more at .
What force keeps us on the ground?
Nuclear force
Electromagnetism
Friction
Gravity
Gravity is the force of attraction between masses and is what keeps us anchored to Earth's surface. It is described by Newton's law of universal gravitation and further explained by Einstein's theory of general relativity. Gravity influences planetary orbits, tides, and many everyday phenomena. For more, see .
What gas do plants take in during photosynthesis?
Oxygen
Carbon dioxide
Hydrogen
Nitrogen
Plants absorb carbon dioxide from the atmosphere through small pores called stomata. They use sunlight to convert CO2 and water into glucose and oxygen in a process known as photosynthesis. This process is fundamental to the carbon cycle and supports most life on Earth. For more details, see .
What is the speed of light in a vacuum approximately?
3 x 10^10 m/s
3 x 10^8 m/s
3 x 10^6 m/s
3 x 10^5 m/s
The speed of light in a vacuum is exactly defined as 299,792,458 meters per second, commonly approximated to 3 x 10^8 m/s. This constant, denoted c, is central to the theories of relativity and electromagnetism. Light's constant speed underpins much of modern physics. See for more.
What is the pH of pure water at 25°C?
7
14
1
0
Pure water at 25°C has a neutral pH of 7, indicating equal concentrations of hydrogen ions (H+) and hydroxide ions (OH-). The pH scale ranges from 0 (strongly acidic) to 14 (strongly basic). Temperature can slightly affect this balance, but 7 is the standard neutral value at room temperature. More details at .
What instrument is used to measure atmospheric pressure?
Thermometer
Hygrometer
Barometer
Anemometer
A barometer measures atmospheric pressure by balancing the weight of the atmosphere against a column of mercury or other fluid. It is a key instrument in weather forecasting and altitude determination. Modern barometers include aneroid types that use flexible metal boxes. Learn more at .
What is the molar mass of carbon dioxide (CO2)?
32 g/mol
28 g/mol
12 g/mol
44 g/mol
The molar mass of CO2 is calculated by adding the atomic masses of one carbon atom (12 g/mol) and two oxygen atoms (16 g/mol each), giving a total of 44 g/mol. This value is used in stoichiometric calculations in chemistry. Carbon dioxide is a key greenhouse gas and metabolic byproduct. More at .
What is the primary function of ribosomes?
Energy production
Lipid synthesis
DNA replication
Protein synthesis
Ribosomes are molecular machines found in all living cells that translate messenger RNA into proteins. They consist of ribosomal RNA and proteins, and can be free in the cytoplasm or bound to the endoplasmic reticulum. Protein synthesis is essential for cell structure and function. See .
Which gas law states that pressure and volume of a gas are inversely proportional at constant temperature?
Gay-Lussac's law
Boyle's law
Avogadro's law
Charles's law
Boyle's law describes how the pressure of a gas decreases as its volume increases, provided the temperature remains constant. Mathematically, P1V1 = P2V2. It was first formulated by Robert Boyle in the 17th century. More information at .
Which element has the highest electronegativity?
Nitrogen
Oxygen
Chlorine
Fluorine
Fluorine is the most electronegative element on the periodic table, with an electronegativity value of 3.98 on the Pauling scale. Electronegativity measures an atom's tendency to attract electrons in a chemical bond. Fluorine's high value makes it highly reactive, especially with metals and hydrogen. Details at .
What is the term for the energy stored due to an object's position?
Kinetic energy
Potential energy
Chemical energy
Thermal energy
Potential energy is the energy an object possesses because of its position or configuration. Examples include gravitational potential energy in elevated objects and elastic potential energy in stretched springs. It can be converted into kinetic energy when the object moves. Learn more at .
Which gas is the primary contributor to the greenhouse effect on Earth?
Oxygen
Methane
Carbon dioxide
Nitrogen
Carbon dioxide is the leading greenhouse gas produced by human activities, such as fossil fuel combustion and deforestation. It traps heat in Earth's atmosphere, contributing to global warming. Although methane and other gases are potent, CO2 has the largest overall impact due to its abundance. More information at .
In an electrical circuit, which unit is used to measure resistance?
Ampere
Volt
Ohm
Watt
Resistance is measured in ohms (?) and quantifies how much a conductor opposes the flow of electric current. It is defined by Ohm's law, R = V/I, where R is resistance, V is voltage, and I is current. Materials with low resistance are good conductors, while high resistance indicates insulators. Learn more at .
What is the approximate half-life of carbon-14?
10,000 years
5,730,000 years
5730 years
1,000 years
Carbon-14 has a half-life of about 5,730 years, which is used in radiocarbon dating to determine the age of organic materials. This relatively long half-life makes it useful for archaeological and geological dating up to about 50,000 years. The isotope decays by beta emission into nitrogen-14. More details at .
In organic chemistry, what is the functional group present in alcohols?
Amino group
Hydroxyl group
Carboxyl group
Carbonyl group
Alcohols contain a hydroxyl functional group (–OH) attached to a carbon atom. This group imparts polarity and allows alcohols to form hydrogen bonds, affecting their boiling points and solubility. The general formula for a simple alcohol is R–OH, where R is an alkyl group. See .
Which quantum number describes the shape of an atomic orbital?
Principal quantum number
Spin quantum number
Azimuthal quantum number
Magnetic quantum number
The azimuthal quantum number, also known as the angular momentum quantum number (l), determines the shape of an atomic orbital. It can take integer values from 0 to n–1, where n is the principal quantum number. Each value corresponds to a different orbital type (s, p, d, f). For more, see .
Which law states that the entropy of a perfect crystal approaches zero as the temperature approaches absolute zero?
First law of thermodynamics
Second law of thermodynamics
Third law of thermodynamics
Zeroth law of thermodynamics
The Third Law of Thermodynamics states that as the temperature of a perfect crystalline substance approaches absolute zero, its entropy approaches zero. This provides an absolute reference point for the determination of entropy. It has important implications for low-temperature chemistry and physics. More at .
During cell division, what is the name of the process that divides the cell's cytoplasm?
Meiosis
Apoptosis
Mitosis
Cytokinesis
Cytokinesis is the process that divides the cell's cytoplasm to form two daughter cells following mitosis or meiosis. It ensures that each new cell receives the necessary organelles and cytosolic components. In animal cells, a contractile ring pinches the cell membrane inward. Learn more at .
What is the standard enthalpy change when one mole of a compound is formed from its elements in their standard states?
Standard enthalpy of vaporization
Standard enthalpy of reaction
Standard enthalpy of formation
Standard enthalpy of combustion
The standard enthalpy of formation is defined as the enthalpy change when one mole of a compound is formed from its constituent elements in their standard states under standard conditions. It is a fundamental thermodynamic parameter used in Hess's law calculations. For more details, see .
What is the minimum energy required to remove an electron from the surface of a metal called?
Electron affinity
Ionization energy
Work function
Binding energy
The work function is the minimum energy needed to remove an electron from the surface of a solid, typically a metal. It is a key concept in the study of photoelectric emission and surface physics. The value depends on the material and its surface condition. Learn more at Work Function on Wikipedia.
According to VSEPR theory, what is the molecular geometry of a water (H2O) molecule?
Tetrahedral
Trigonal planar
Bent
Linear
VSEPR theory predicts that the two lone pairs and two bonding pairs around the oxygen atom in H2O arrange themselves to minimize repulsion, resulting in a bent molecular geometry with an angle of about 104.5°. This shape influences water's dipole moment and hydrogen bonding properties. For more, see .
What is the significance of the Rydberg constant in physics?
It defines the speed of light in vacuum
It describes the energy levels in the hydrogen atom
It relates pressure and temperature in gases
It measures electric potential difference
The Rydberg constant is a fundamental physical constant that appears in the Rydberg formula, which predicts the wavelengths of spectral lines in hydrogen and hydrogen-like atoms. Its value is approximately 1.097×10^7 m^-1. It played a crucial role in the development of quantum mechanics. See .
Which principle in quantum mechanics states that it is impossible to simultaneously know the exact position and momentum of a particle?
Pauli exclusion principle
Complementarity principle
Schrödinger wave equation
Heisenberg uncertainty principle
The Heisenberg uncertainty principle asserts that the more precisely the position of a particle is known, the less precisely its momentum can be known, and vice versa. It is a fundamental limit in quantum mechanics derived from the wave-like nature of particles. This principle has profound implications for measurement and observation at the quantum scale. Details at .
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Study Outcomes

  1. Assess Your Science Proficiency -

    Evaluate your understanding of key biology, chemistry, and physics concepts through a series of scored quiz bee questions.

  2. Identify Knowledge Gaps -

    Pinpoint specific areas where your science knowledge needs improvement to focus your future study efforts.

  3. Recall Fundamental Concepts -

    Strengthen memory of essential scientific principles by engaging with diverse science bee questions.

  4. Apply Problem-Solving Skills -

    Tackle challenging quiz bee questions that require analytical thinking and real-world science application.

  5. Interpret Quiz Results -

    Analyze your scored outcomes to understand performance trends and guide your learning progress.

  6. Enhance Study Strategies -

    Use immediate feedback and scoring insights to refine your preparation approach for future science quizzes.

Cheat Sheet

  1. Taxonomic Hierarchy Mnemonic -

    Recall the eight levels of biological classification from Domain to Species using "Dear King Philip Came Over For Good Soup." When tackling biology quiz bee questions, this memory trick keeps the sequence clear and saves time under pressure. Practice classifying example organisms, like the house cat (Eukarya > Animalia > Chordata > Mammalia > Carnivora > Felidae > Felis > catus), using resources from the UC Berkeley Museum of Vertebrate Zoology.

  2. Photosynthesis Equation and Light-Dark Reactions -

    Memorize the overall equation 6CO₂ + 6H₂O → C₆H₝₂O₆ + 6O₂, which appears frequently in science bee questions on plant biology. Understand the two main stages: light reactions in the thylakoid membranes produce ATP and NADPH, and the Calvin cycle in the stroma fixes CO₂ into glucose, as detailed in research articles at the American Society of Plant Biologists. Linking theory with diagrams from MIT OpenCourseWare reinforces your recall under timed quiz bee conditions.

  3. Mole Concept and Stoichiometry -

    Master the mole concept (1 mol = 6.022×10²³ particles) and the formula n = m/M to convert mass to moles, since many quizbee chemistry questions hinge on stoichiometric calculations. Practice balancing chemical equations and using the molarity formula M = n/V with sample problems from the IUPAC Gold Book. Knowing this foundation lets you solve reagent-limiting and yield questions confidently during the science quiz bee.

  4. Periodic Table Trends -

    Familiarize yourself with periodic trends: atomic radius decreases across a period and increases down a group, while electronegativity shows the opposite behavior, according to data from the Royal Society of Chemistry. Use the mnemonic "FONClBrISCH" (fluorine, oxygen, nitrogen, chlorine, bromine, iodine, sulfur, carbon, hydrogen) to recall halogen and chalcogen group orders. Applying these trends helps you predict element properties quickly when faced with challenging quiz bee questions.

  5. Newton's Laws of Motion -

    Recall Newton's second law F = ma (force equals mass times acceleration) as the backbone for many physics quiz bee questions on motion. Remember the first law (inertia) and third law (action-reaction) with examples like a book sliding on a table and the recoil of a balloon, drawing on classical mechanics resources from MIT Physics. Visualizing real-world examples boosts your speed and accuracy under quiz bee time constraints.

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