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Questions and Answers
What determines the number of covalent bonds formed by an atom?
What determines the number of covalent bonds formed by an atom?
What is the correct molecular formula for caffeine?
What is the correct molecular formula for caffeine?
A covalent chemical bond is one in which:
A covalent chemical bond is one in which:
A shared pair of electrons is called a: _________.
A shared pair of electrons is called a: _________.
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Will O2 form a polar covalent bond?
Will O2 form a polar covalent bond?
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Will a polar covalent bond form between the two nitrogen atoms in nitrogen gas (N2)?
Will a polar covalent bond form between the two nitrogen atoms in nitrogen gas (N2)?
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What do the four elements most abundant in life - carbon, oxygen, hydrogen and nitrogen - have in common?
What do the four elements most abundant in life - carbon, oxygen, hydrogen and nitrogen - have in common?
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Table salt is composed of Na+ and Cl- to form NaCl. This type of bond is called: _____________.
Table salt is composed of Na+ and Cl- to form NaCl. This type of bond is called: _____________.
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A double covalent bond is the sharing of a total of how many electrons?
A double covalent bond is the sharing of a total of how many electrons?
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Which bond is the weakest?
Which bond is the weakest?
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Study Notes
Covalent Bonds
- The number of covalent bonds formed by an atom is determined by the electrons in its outer valence shell.
- A covalent bond is characterized by the sharing of outer shell electrons between two atoms to satisfy both their outer electron shell requirements.
- A shared pair of electrons is referred to as a covalent bond.
Caffeine Molecular Formula
- The correct molecular formula for caffeine is C8H10N4O2.
Polar and Non-Polar Bonds
- O2 does not form a polar covalent bond because both oxygen atoms are equally electronegative.
- In nitrogen gas (N2), a polar covalent bond will not form due to equal electronegativity between the two nitrogen atoms.
Abundant Elements in Life
- The four most abundant elements in life—carbon, oxygen, hydrogen, and nitrogen—all have unpaired electrons in their valence shells.
Types of Chemical Bonds
- Table salt (NaCl) is formed through ionic bonds, which result from the electrostatic attraction between Na+ and Cl- ions.
- A double covalent bond involves the sharing of a total of four electrons.
- Among covalent, hydrogen, and ionic bonds, hydrogen bonds are considered the weakest.
Additional Notes
- Polar covalent bonds typically occur between atoms of differing electronegativities, causing an unequal sharing of electrons.
- Ionic bonds arise from the complete transfer of electrons from one atom to another, resulting in charged ions.
Studying That Suits You
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Description
Test your knowledge of chemical bonding concepts with these flashcards. Explore topics such as covalent bonds and molecular formulas for compounds like caffeine. Perfect for students looking to enhance their understanding of chemistry.
