Chapter 2 Chemistry of Life Quiz review

What is chemistry?

Science that deals with the structure of matter, mass, and fluids

How many essential elements are there in the human body?

13

Which 3 essential elements are the most important?

• Water

• Carbon

• Hydrogen

What are the percentages of the 3 most important essential elements in the human body?

• Water (65%)

• Carbon (18.6%)

• Hydrogen (9.7%)

What do you do to change the volume of water?

Increase the temperature

What is the definition for gases?

They don’t have a constant volume or shape and can be compressed or expanded to react with other gasses

What is the formula for exchange chemical reaction?

AB+CD = AD+CB

What has a pH of 7?

Water

What is the most neutral pH?

7

What is kinetic energy?

Energy of motion (moving around)

What is potential energy?

Stored energy (sitting down or sleeping)

What are enzymes?

Proteins that promote chemical reactions by lowering the activation energy

What are electrolytes?

Soluble inorganic molecules whose ions conduct electrical currents in solutions