Properties of Water

-A water molecule is composed of 2 H atoms and 1 O atom. What is the chemical equation for water?

• HO

• H2O

• H3O

• H2O2

Tags

NGSS.MS-PS1-1

Water is a polar molecule, which means it has a positive and a negative side. Hydrogen bonds form when:

• _{The positive end of one water molecule bonds to the positive end of another water molecule.}

• _{The negative end of one water molecule bonds to the negative end of another water molecule.}

• _{The positive end of one water molecule bonds to the negative end of another water molecule.}

The ability of water molecules to stick to each other, creating surface tension is called:

• Cohesion

• Adhesion

• Insulation

• Ph

The fact that water can stick to other substances is called:

• Ph

• Adhesion

• Cohesion

• Insulation

Why does ice float on water?



• When it freezes it becomes less dense

• When it freezes it becomes more dense

• When it freezes its density stays the same

Tags

NGSS.MS-PS1-4

When salt is dissolved in water, water is the

• solvent

• solute

• solution

• reactant

Tags

NGSS.MS-PS1-2

A solution is a(an)...

• chemical reaction

• breaking of a chemical bond

• combination of two or more liquids

• evenly distributed mixture of two or more substances

Water is often called the "universal solvent" because many substances can be dissolved in water. What property of water allows it to be such a versatile solvent?

• purity

• polarity

• high heat capacity

• expansion upon freezing

 Small insects can walk across the surface of calm water. Their feet push the surface of the water down slightly, somewhat like a person walking across a trampoline, but they do not break the surface. What is the best explanation for why this happens?

• The insects are light enough so that they do not break the hydrogen bonds holding the water molecules together
• The insects actually use their wings to hover slightly above the water's surface and they only skim it with their feet
• The insects' feet are non-polar, so they are repelled by the polar water molecules and are pushed away from the water's surface
• The insects are small enough to see the individual water molecules, so they are able to step carefully from one molecule to the next

Tags

NGSS.MS-PS2-5

A florist places a bouquet of white carnations in water containing blue dye. After a time, the flowers turn blue. What process helped the carnations to change color?

• Specific heat

• Surface tension

• Capillary Action

• Formation of covalent bonds between hydrogen and oxygen molecules