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Questions and Answers
Which of the following options correctly describes carbon, hydrogen, and nitrogen?
Which of the following options correctly describes carbon, hydrogen, and nitrogen?
- They are compounds formed from the combination of several other elements.
- They are elements, which are the fundamental substances that cannot be broken down by chemical means. (correct)
- They are specifically classified as amino acids, the building blocks of proteins.
- They are macromolecules, which are large complex molecules essential for living organisms.
What are the subatomic particles with a single negative charge that orbit the nucleus?
What are the subatomic particles with a single negative charge that orbit the nucleus?
- Electrons (correct)
- Neutrons
- Protons
- Isotopes
If nitrogen has 7 protons, 7 neutrons, and 7 electrons, what is its atomic mass?
If nitrogen has 7 protons, 7 neutrons, and 7 electrons, what is its atomic mass?
- 14 (correct)
- 0
- 21
- 7
Given p, n, and e represent protons, neutrons, and electrons, respectively, which atomic configuration would result in an atomic weight of 30?
Given p, n, and e represent protons, neutrons, and electrons, respectively, which atomic configuration would result in an atomic weight of 30?
Why is O2 considered a molecule but not a compound?
Why is O2 considered a molecule but not a compound?
Flashcards
What are elements?
What are elements?
Basic building blocks of matter that cannot be broken down into simpler substances by ordinary chemical means.
What is a compound?
What is a compound?
A substance composed of two or more different elements chemically combined in a fixed ratio.
What is the nucleus?
What is the nucleus?
The center of an atom, containing protons and neutrons.
What is the atomic number?
What is the atomic number?
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What is the atomic mass?
What is the atomic mass?
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Study Notes
Elements, Compounds, and Atoms
- Carbon, hydrogen, and nitrogen are elements.
- O2 (atmospheric oxygen) is a molecule, but not a compound; it is composed of two of the same element.
- Compounds are molecules formed from two or more different elements.
Subatomic Particles
- Electrons are negatively charged particles that orbit the nucleus of an atom.
- Protons are positively charged particles found in the nucleus.
- Neutrons are uncharged particles in the nucleus.
Atomic Mass
- Atomic mass is calculated by adding the number of protons and neutrons in an atom.
- An atom of nitrogen (7 protons and 7 neutrons) has an atomic mass of 14.
Representing Atoms
- Atoms can be represented using p, n, and e to denote the number of protons, neutrons, and electrons.
- An atom with an atomic weight of 30 has 15 protons and 15 neutrons.
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