Unit 2 Biochemistry for 9th Graders

The chemical compound of water is

• 1 Hydrogen, 1 Oxygen
• 2 Hydrogen, 1 Oxygen
• 3 Hydrogens, 1 Oxygen
• 1 Hydrogen, 2 Oxygens

Tags

NGSS.HS-ESS2-5

Water has 2 electrical poles making it

• Multipolar
• Bipolar
• a polar molecule
• electronic polar

Tags

NGSS.HS-PS1-3

Cohesion is

• the ability of water to cling to another substance
• the ability to move through and around a substance
• water clumping together
• None of the above

Tags

NGSS.HS-PS1-3

bond created by the weak attraction of a slightly positive hydrogen atom to a slightly negative portion of another molecule

• polar molecule
• solution
• adhesion
• hydrogen bond

Tendency of molecules of different types to stick to one another

• adhesion
• cohesion
• solution
• polar molecule

Water is a universal solvent because

• it can dissolve a variety of substances
• life is made out of water
• water can be found throughout the uni

Tags

NGSS.HS-ESS2-5

Why does Ice float?

• It is less dense than in liquid form.
• It is more dense than in liquid form.
• It has more surface tension
• None of the above

Tags

NGSS.HS-PS1-3

Water heating up slowly on the stove is an example of

• adhesion
• cohesion
• high heat capacity
• surface tension

Tags

NGSS.HS-PS3-4

Which is more dense?

• left cube
• right cube

Tags

NGSS.HS-PS1-3

Why does ice float?

• As water freezes, it expands and its density decreases.
• As water freezes, it takes up more hydrogen from the atmosphere, causing it to have a greater buoyancy.
• As water freezes, air becomes trapped between the hydrogen bonds of water molecules.
• As water freezes, it takes up more oxygen from the atmosphere, causing it to have a greater buoyancy.

Tags

NGSS.MS-PS1-4