Reactions trivia
More Reactions Trivia
Chemical formulas, combustion, and state changes.
Reactions Mini Quiz
Test your knowledge with these top questions!
Which of the following is a common indicator of a chemical reaction taking place?
A change in color is a common indicator of a chemical reaction because it often signifies the formation of new substances.
Which process turns a gas directly into a solid?
Deposition is the thermodynamic opposite of sublimation. A common example is the formation of frost on windows when water vapor turns directly into ice.
Which process turns a liquid into a gas throughout the entire volume?
Boiling happens when vapor pressure matches external pressure, allowing bubbles to form throughout the liquid. Evaporation only occurs at the surface.
Which process turns a liquid into a gas only at its surface?
Unlike boiling, evaporation occurs only at the surface and provides cooling as the most energetic molecules escape, reducing the liquid's temperature.
Which process turns dry ice directly into a gas?
Carbon dioxide requires a pressure of at least 5.1 atmospheres to exist as a liquid, which is why dry ice sublimes directly into a gas at normal atmospheric pressure.
Which reaction releases heat into its surroundings?
The word exothermic comes from the Greek words for outside and heat. These reactions occur when forming new bonds releases more energy than is required to break old ones.