Chemistry A Unit 4 Practice Test

Front

What happens to energy when ice melts to water?

Back

Energy is absorbed; the process is endothermic.

Front

Which group of elements has the smallest atomic radius within a period?

Back

Noble Gases (Group 18) have the smallest atomic radius.

Front

Which element has a higher electronegativity than arsenic (As)?

Back

Carbon (C) has a higher electronegativity than arsenic.

Front

What is the correct Lewis structure for the compound PBr3?

Back

Structure D is the correct Lewis structure for PBr3.

Front

What is Ionic Bonding?

Back

Ionic Bonding is the transfer of electron/s between atoms.

Front

Define endothermic process.

Back

An endothermic process is one that absorbs energy from its surroundings.

Front

What is electronegativity?

Back

Electronegativity is the tendency of an atom to attract electrons in a chemical bond.

Front

Which group contains the most reactive metals?

Back

Alkali metals (Group 1) are the most reactive metals.

Front

What is the significance of the octet rule in chemistry?

Back

The octet rule states that atoms tend to gain, lose, or share electrons to achieve a full outer shell of eight electrons.

Front

What is the difference between ionic and covalent bonds?

Back

Ionic bonds involve the transfer of electrons, while covalent bonds involve the sharing of electrons.