Chemistry and Photosynthesis quiz

Is the density of water ice lower, higher, or the same as liquid water?

• Lower
• Higher
• The same
• Um... what is density again

Why does water ice have a lower density than liquid water?

• Because it floats

• Because it is a crystal

• Because the molecules expand in volume as water freezes into a crystal

• Because ice is colder than water

What is adhesion?

• Water's ability to stick to itself
• Water's ability to stick to other substances
• The strength of the cohesion of all the water molecules combined
• Tape, glue and other adhesives

What is cohesion?

• Water's ability to stick to itself
• Water's ability to stick to other substances
• The strength of the cohesion of all the water molecules combined
• Tape, glue and other adhesives

What is surface tension?

• Water's ability to stick to itself
• Water's ability to stick to other substances
• The strength of the cohesion of all the water molecules combined
• Tape, glue and other adhesives

What is an ecosystem?

• All of the living things in an ecosystem
• All of the non living things in an ecosystem
• All of the living and nonliving things combined
• A piece of a living thing

The pH scale measures what

• concentration of H+ atoms

• water concentration of the liquid

• amound of protein in the water

• amount of molecules water is attached to

Which of the following is not a macromolecule instrumental in sustaining life

• water

• protein

• lipids (fats)

• Carbohydrates (sugars)

What is the strongest bond between two atoms in a molecule

• ionic

• covalent

• hydrogen bond

Water has a high heat capacity which means that __________________

• It takes little energy to raise the temperature of water

• It takes more energy to raise the temperature of water

• water likes high heat