Introduction to Chemical Bonds

What do chemical bonds do?

• Nothing

• Holds atoms together

• Holds atoms apart

Answer explanation

Chemical bonds are essential as they hold atoms together, forming molecules and compounds. This is crucial for the structure and stability of matter, making 'Holds atoms together' the correct answer.

What are the three main types of chemical bonds?

Answer explanation

The three main types of chemical bonds are ionic, covalent, and metallic bonds. Ionic bonds involve the transfer of electrons, covalent bonds involve sharing electrons, and metallic bonds involve a sea of delocalized electrons.

Tags

NGSS.HS-PS1-3

What is a covalent bond?

• A bond where electrons are transferred

• A bond where two atoms share electrons

• A bond that occurs between metals

• A bond that involves ionic transfer.

Answer explanation

A covalent bond is formed when two atoms share electrons, allowing them to achieve greater stability. This distinguishes it from ionic bonds, where electrons are transferred, and is not limited to interactions between metals.

Tags

NGSS.HS-PS1-1

What is the main difference between covalent bonds and ionic bonds?

• Electron transfer occurs in covalent bonds

• Covalent bonds involve sharing electrons

• Ionic bonds involve sharing electrons

• Covalent bonds occur between metals.

Answer explanation

The main difference is that covalent bonds involve sharing electrons between atoms, while ionic bonds involve the transfer of electrons from one atom to another. This makes the correct choice about covalent bonds sharing electrons.

Covalent bonds typically occur between ________.

• nonmetals.

• metals.

• metalloids.

• noble gases.

Answer explanation

Covalent bonds typically occur between nonmetals, as they share electrons to achieve stability. Metals usually form ionic bonds, while metalloids can exhibit both behaviors. Noble gases are generally inert and do not form bonds.

What type of bond is present in H2?

• Single

• Double

• Triple

Answer explanation

H2 has a single bond between the two hydrogen atoms. Each hydrogen atom shares one electron, forming a single covalent bond, which is the simplest type of bond.

What type of bond is present in O2?

• Single

• Double

• Triple

Answer explanation

O2 has a double bond between the two oxygen atoms. Each oxygen atom shares two electrons, resulting in a double bond, which is stronger than a single bond and allows for the stable formation of the O2 molecule.

What type of bond is present in N2?

• Single

• Double

• Triple

Answer explanation

N2, or nitrogen gas, has a triple bond between the two nitrogen atoms. This means they share three pairs of electrons, making it a very strong bond, which is why the correct answer is 'Triple'.

How many electrons are shared in a single covalent bond?

• Two

• Four

• Six

Answer explanation

In a single covalent bond, two electrons are shared between two atoms. This sharing allows each atom to achieve a more stable electron configuration, making 'Two' the correct answer.

How many electrons are shared in a double covalent bond?

• A) Two

• B) Four

• C) Six

Answer explanation

In a double covalent bond, four electrons are shared between two atoms, with each atom contributing two electrons. Therefore, the correct answer is B) Four.