객관식
Which part of an atom is positively charged?
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- 1. Intro to General Chemistry3h 46m
- Classification of Matter18m
- Physical & Chemical Changes19m
- Chemical Properties7m
- Physical Properties5m
- Intensive vs. Extensive Properties13m
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- Scientific Notation13m
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- 2. Atoms & Elements4h 17m
- The Atom9m
- Subatomic Particles15m
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- 10. Periodic Properties of the Elements3h 10m
- The Electron Configuration22m
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- 11. Bonding & Molecular Structure3h 29m
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- 12. Molecular Shapes & Valence Bond Theory1h 58m
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- Molecular Polarity10m
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- 15. Chemical Kinetics2h 53m
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- 17. Acid and Base Equilibrium5h 5m
- Acids Introduction9m
- Bases Introduction7m
- Binary Acids15m
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- Bases14m
- Amphoteric Species5m
- Arrhenius Acids and Bases5m
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- 18. Aqueous Equilibrium4h 47m
- Intro to Buffers20m
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- 22. Organic Chemistry5h 7m
- Introduction to Organic Chemistry8m
- Structural Formula8m
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- Skeletal Formula6m
- Spatial Orientation of Bonds3m
- Intro to Hydrocarbons16m
- Isomers11m
- Chirality15m
- Functional Groups in Chemistry11m
- Naming Alkanes4m
- The Alkyl Groups9m
- Naming Alkanes with Substituents13m
- Naming Cyclic Alkanes6m
- Naming Other Substituents8m
- Naming Alcohols11m
- Naming Alkenes11m
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- Naming Ketones5m
- Naming Aldehydes5m
- Naming Carboxylic Acids4m
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- Naming Ethers5m
- Naming Amines5m
- Naming Benzene7m
- Alkane Reactions7m
- Intro to Addition Reactions4m
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- Amide Formation4m
- Benzene Reactions10m
- 23. Chemistry of the Nonmetals2h 39m
- Main Group Elements: Bonding Types4m
- Main Group Elements: Boiling & Melting Points7m
- Main Group Elements: Density11m
- Main Group Elements: Periodic Trends7m
- The Electron Configuration Review16m
- Periodic Table Charges Review20m
- Hydrogen Isotopes4m
- Hydrogen Compounds11m
- Production of Hydrogen8m
- Group 1A and 2A Reactions7m
- Boron Family Reactions7m
- Boron Family: Borane7m
- Borane Reactions7m
- Nitrogen Family Reactions12m
- Oxides, Peroxides, and Superoxides12m
- Oxide Reactions4m
- Peroxide and Superoxide Reactions6m
- Noble Gas Compounds3m
- 24. Transition Metals and Coordination Compounds3h 19m
- Atomic Radius & Density of Transition Metals11m
- Electron Configurations of Transition Metals7m
- Electron Configurations of Transition Metals: Exceptions11m
- Paramagnetism and Diamagnetism10m
- Ligands10m
- Complex Ions5m
- Coordination Complexes7m
- Classification of Ligands11m
- Coordination Numbers & Geometry9m
- Naming Coordination Compounds22m
- Writing Formulas of Coordination Compounds8m
- Isomerism in Coordination Complexes17m
- Orientations of D Orbitals4m
- Intro to Crystal Field Theory10m
- Crystal Field Theory: Octahedral Complexes5m
- Crystal Field Theory: Tetrahedral Complexes4m
- Crystal Field Theory: Square Planar Complexes4m
- Crystal Field Theory Summary8m
- Magnetic Properties of Complex Ions9m
- Strong-Field vs Weak-Field Ligands6m
- Magnetic Properties of Complex Ions: Octahedral Complexes11m
2. Atoms & Elements
The Atom
Multiple Choice
Which chemical element is the primary constituent of a young star?
A
Carbon
B
Hydrogen
C
Helium
D
Oxygen
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검증된 단계별 안내1
Understand that a young star primarily consists of the simplest and most abundant element in the universe, which is hydrogen.
Recall that stars form from clouds of gas and dust, mostly composed of hydrogen atoms, which undergo nuclear fusion in the star's core.
Recognize that during the early stages of a star's life, hydrogen nuclei fuse to form helium, releasing energy that powers the star.
Note that while elements like carbon, oxygen, and helium are present, they are not the main constituents of a young star.
Conclude that hydrogen is the primary chemical element in a young star due to its abundance and role in stellar formation and fusion.
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