Enzymes & Special Properties of Water

What two elements make up water?

• Helium and oxygen
• Hydrogen and oxygen
• helium and carbon
• oxygen and carbon

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NGSS.MS-PS1-1

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

• covalent bonds result in water cohesion

• hydrogen bonds result in water cohesion (surface tension)

• low surface tension of water

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Attractions between the negative Oxygen atom of one water molecule and the positive Hydrogen atom of another water molecule are called

• Covalent bonds
• Ionic bonds
• Polar bonds
• Hydrogen bonds

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NGSS.MS-PS1-1

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.

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Water travels up from the roots of a tree to the top because of

• adhesion and cohesion

• surface tension

• specific heat capacity

• density of water compared to ice

Water droplets take a spherical shape (as pictured) because of ____________

• adhesion
• cohesion
• capillary action
• solubility

A molecule with electrically charged areas is called a _______________.

• magnet
• polar molecule
• solution
• electrical molecule

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NGSS.MS-PS1-1

Water is a universal solvent because it...

• It can be found anywhere
• It freezes when it gets cold
• floats when frozen
• Dissolves most substances

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NGSS.MS-PS1-2

Ice floats when placed in a liquid water because:

• ice is less dense than the liquid
• ice is more dense than the liquid
• ice is soluble
• water is adhesive

Which of the following is LEAST likely to dissolve in water?

• nonpolar fats and oils
• polar sugar molecules
• salt made of a positive sodium ion and a negative chloride ion
• all of the substances will dissolve easily in water

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NGSS.HS-PS1-3