CHE005 LAS 6 Quiz

Which reaction involves a substance reacting with oxygen to produce CO₂ and H₂O?

• Decomposition

• Combustion

• Synthesis

• Substitution

TRUE OR FALSE: Combustion reactions are generally exothermic.

• True

• False

A chemical equation is used to represent:

• The physical appearance of a reaction

• The price of the chemicals used

• The speed of a reaction

• The balance of mass and atoms in a reaction

TRUE OR FALSE: Hydrocarbons cannot undergo both substitution and addition reactions depending on their structure.

• True

• False

In the bromine water test, a change in color typically indicates:

• The presence of saturated hydrocarbons

• The absence of double bonds

• The reaction of unsaturated bonds (alkenes or alkynes)

• The formation of water

TRUE OR FALSE: Benzene reacts with potassium permanganate in the potassium permanganate test to produce nitrobenzene.

• True

• False

Which test involves adding concentrated HNO₃ and H₂SO₄ to observe a chemical reaction in benzene?

• Bromine water test

• Nitration test

• Potassium permanganate test

• Combustion test

TRUE OR FALSE: In the potassium permanganate test, a color change indicates the presence of unsaturation in a hydrocarbon.

• True

• False

Alkanes are most likely to undergo which type of reaction?

• Addition reactions

• Substitution reactions

• Combustion reactions only

• Elimination reactions

TRUE OR FALSE: Alkanes typically undergo substitution reactions rather than addition reactions.

• True

• False