Questions

Explanations

21  Which element has atoms that can bond with each other to form ring, chain, and network structures?

(1)  aluminum    (3) carbon

(2)  calcium         (4) argon

22 What is the number of electrons shared in the multiple carbon-carbon bond in one molecule of 1-pentyne?

(1)  6         (3) 3     

(2)  2         (4) 8

3 pairs of electrons or 6 electrons

23  Butanal, butanone, and diethyl ether have different properties because the molecules of each compound differ in their

(1)  numbers of carbon atoms

(2)  numbers of oxygen atoms

(3)  types of functional groups

(4)  types of radioactive isotopes

-one...ketone

ether...ether

carbons are the same, so are the number of oxygen

different functional groups

24  What occurs when a magnesium atom becomes a magnesium ion?

(1)  Electrons are gained and the oxidation number increases.

(2)  Electrons are gained and the oxidation number decreases.

(3)  Electrons are lost and the oxidation number increases.

(4)  Electrons are lost and the oxidation number decreases.

25  Energy is required to produce a chemical change during

(1)  chromatography         (3) boiling

(2)  electrolysis                 (4) melting