Thermodynamics and Acid/Base Basics

Front

What type of reaction occurs in a hand warmer?

Back

Exothermic reaction: A reaction that releases heat, making the surroundings warmer.

Front

What is the pH range of acids?

Back

pH less than 7: Substances with a pH below 7 are considered acids.

Front

What type of chemical reaction produces heat, as seen in the bombardier beetle's hot spray?

Back

Exothermic chemical reaction: A reaction that releases energy in the form of heat.

Front

What is the pH of ammonia?

Back

pH of 12: Ammonia is classified as a base.

Front

What taste is commonly associated with acids?

Back

Sour: Acids typically have a sour taste.

Front

What is the definition of an acid?

Back

An acid is a substance that donates protons (H+) in a solution.

Front

What is the definition of a base?

Back

A base is a substance that accepts protons (H+) or donates hydroxide ions (OH-) in a solution.

Front

What is the pH range of bases?

Back

pH greater than 7: Substances with a pH above 7 are considered bases.

Front

What is an example of an exothermic reaction?

Back

Combustion: The burning of fuels releases heat.

Front

What is an example of an endothermic reaction?

Back

Photosynthesis: Plants absorb energy from sunlight to convert carbon dioxide and water into glucose.