8th Science Ch18 Sec 1 (Chemical Bonds)

Why do elements bond?

• To be friends

• To create a new element

• To become stable

• To get bigger

Which of these is not a real bond in chemistry?

• James

• Ionic

• Covalent

• Metallic

Ionic bonds are between...

• nonmetals and nonmetals
• carbon and oxygen
• metals and nonmentals
• hydrogen and chlorine

Covalent bonds are between...

• two or more nonmetals
• sodium and chlorine
• metals and metals
• metals and nonmetals

What kind of bond forms when atoms exchange electrons?

• ionic
• covalent
• artificial
• univalent

If an atom loses two electrons what charge will it have?

• -2
• -1
• +1
• +2

If an atom gains two electrons what charge will it have?

• -2
• -1
• +1
• +2

Which statement best describes the relationship between atoms & molecules.

• molecules are made of atoms that are chemically bonded together.

• atoms are made of molecules that are chemically bonded together.

• molecules are made of a mixture of atoms and compounds.

• atoms are made of protons, neutrons & electrons.

Chemical bond is ...

• the physical mixing of two different atoms.

• the force that holds two atoms together

• the energy used up when two atoms combined.

• the temperature that changes the phase of matter.

Which of the following describes covalent bonds?

• Bonds form because of opposite charges

• electrons are shared to fill outer electron shells

• Electrons are transferred between atoms

• Covalent bonds are magical