Table of contents

1. Intro to General Chemistry3h 48m
2. Atoms & Elements4h 16m
3. Chemical Reactions4h 10m
4. BONUS: Lab Techniques and Procedures1h 38m
5. BONUS: Mathematical Operations and Functions48m
6. Chemical Quantities & Aqueous Reactions3h 53m
7. Gases3h 49m
8. Thermochemistry2h 37m
9. Quantum Mechanics2h 58m
10. Periodic Properties of the Elements3h 9m
11. Bonding & Molecular Structure3h 29m
12. Molecular Shapes & Valence Bond Theory1h 57m
13. Liquids, Solids & Intermolecular Forces2h 23m
14. Solutions3h 1m
15. Chemical Kinetics2h 53m
16. Chemical Equilibrium2h 29m
17. Acid and Base Equilibrium5h 1m
18. Aqueous Equilibrium4h 47m
19. Chemical Thermodynamics1h 50m
20. Electrochemistry2h 42m
21. Nuclear Chemistry2h 36m
22. Organic Chemistry5h 7m
23. Chemistry of the Nonmetals2h 39m
24. Transition Metals and Coordination Compounds3h 16m

2. Atoms & Elements

Isotopes

General Chemistry

2. Atoms & Elements

Isotopes

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Multiple Choice

Carbon-12 and carbon-13 are isotopes of carbon. Which of the following statements is correct?

Carbon-12 and carbon-13 have different numbers of protons and the same number of neutrons.

Carbon-12 and carbon-13 have the same number of protons but different numbers of neutrons.

Carbon-12 and carbon-13 have the same atomic mass.

Carbon-12 and carbon-13 are different elements.

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Verified step by step guidance

Understand the concept of isotopes: Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons.

Identify the element: Both carbon-12 and carbon-13 are isotopes of carbon, which means they have the same number of protons. Carbon has an atomic number of 6, indicating 6 protons.

Analyze the neutron difference: Carbon-12 has 6 neutrons (12 - 6 = 6), while carbon-13 has 7 neutrons (13 - 6 = 7). This shows they have different numbers of neutrons.

Evaluate the atomic mass: The atomic mass of an isotope is the sum of its protons and neutrons. Therefore, carbon-12 has an atomic mass of 12, and carbon-13 has an atomic mass of 13, indicating they do not have the same atomic mass.

Conclude the element identity: Since isotopes are variations of the same element, carbon-12 and carbon-13 are not different elements; they are both carbon.