Biology: Water and pH

The pH scale is a range from:

• 1-7
• 0-14
• 1-20

A(n) ______ is a substance with a pH less than 7

• Acid
• Base
• Buffer

A(n) _______ is a substance with a pH greater than 7.

• Base
• Acid
• Buffer

What is the only substance with a neutral pH of 7?

• Orange Juice
• Water
• Blood

A insect like a water strider can skate along the top of a pond because:

• Water has high specific heat

• cohesion of water molecules result in high surface tension

• low surface tension of water

Why does ice float?

• As water freezes, it expands and it becomes less dense

• As water freezes, it takes up more hydrogen from the atmosphere, causing it to have a greater buoyancy.
• As water freezes, it takes up more oxygen from the atmosphere, causing it to have a greater buoyancy.

Water is a universal solvent because it...

• It can be found anywhere
• floats when frozen
• Dissolves most substances

Is water a polar or non-polar molecule?

• polar
• non-polar

Tags

NGSS.HS-PS1-3

What is cohesion?

• water molecules sticking to other water molecules
• water molecules sticking to different molecules
• when you dissolve a substance in a solution 

Bleach is a strong base, what is the pH level of bleach?

• 13
• 10

• 1
• 2