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

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

Which end of the water molecule has a slightly positive charge?

• the oxygen end
• the hydrogen end
• both ends are slightly positive
• neither end is positive

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NGSS.HS-ESS2-5

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.HS-ESS2-5

What is water's molecular formula

• H₂O

• H₂O₂

• O₂H

• CO₂

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NGSS.MS-PS1-1

The atoms in a water molecule are held together by covalent bonds. This means that the bonded atoms

• Lose protons

• Lose electrons

• Share electrons

• Switch neutrons

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NGSS.MS-PS1-1

A water molecule has the chemical formula H2O. This means that the water molecule is made up of

• Two hydrogen atoms and one oxygen atom

• Two oxygen atoms and one hydrogen atom

• Two hydrogen atoms and two oxygen atoms

• Two molecules of water

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NGSS.MS-PS1-1

The water molecule is a polar molecule. A water molecule is polar because

• The electrons are shared equally

• Oxygen has a stronger attraction for electrons than hydrogen

• It is very cold

• Hydrogen atoms have a stronger attraction for electrons than oxygen

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NGSS.MS-PS1-1

Water molecules are attracted to each other because

• They are all positively charged

• Each water molecule has the same number of protons as electrons

• The positive area of one water molecule is attracted to the negative area of another

• All water molecules are neutral

Water is able to dissolve sodium chloride because

• The polar areas of water molecules attract the oppositely charged ions of sodium chloride

• The shape of the water molecules pushes the sodium and chloride ions apart

• The oxygen in the water molecules reacts with the sodium and chloride ions

• Water molecules and sodium chloride are covalently bonded

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NGSS.MS-PS1-2