Water Properties and pH

Surface tension is the property of water in which...

• water molecules at the surface tend to stick together.

• water spills easily.

• water tends to be see-through.

Refer to the picture of water sticking to a leaf; this is occurring because of:

• Adhesion

• Cohesion

What two elements make up water?

• Helium and oxygen

• Hydrogen and oxygen

• helium and carbon

• oxygen and carbon

Tags

NGSS.MS-PS1-1

tendency of molecules of the same kind to stick to one another

• cohesion

• adhesion

• solution

• polar molecule

What is adhesion?

• Water's ability to stick to itself

• Water's ability to stick to other substances

• The strength of the cohesion of all the water molecules combined

• Tape, glue and other adhesives

TRUE or FALSE? Adhesive forces allow water to climb against gravity in narrow tubes, like in the xylem of plants.

• TRUE

• FALSE

Avery and Daniel are conducting an experiment to understand the properties of water. What effect does cohesion have on the boiling point of water?

• It makes the boiling point of water lower.

• It makes the boiling point of water higher.

• It has no effect on the boiling point of water.

• It makes the boiling point of water fluctuate.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

During a science experiment, Liam observed that water droplets stuck to a glass surface. What is this phenomenon called?

• The attraction of molecules of one kind to substances of a different kind.

• The attraction of molecules of the same kind to each other.

• The process of water evaporating into the air.

• The process of water freezing into ice.

What is the combined effect of adhesion and cohesion in water?

• It causes water to evaporate quickly.

• It allows water to boil at a lower temperature.

• It draws water up a straw or plant stem against gravity.

• It makes water freeze at a higher temperature.

The table shows the pH of several solutions. Which solution has the greatest concentration (amount) of H⁺ ions?

• vinegar

• milk

• water

• bleach

Answer explanation

Remember H⁺ is another name for an acid. So, another way to ask this would be; which of these is the strongest acid?

Tags

NGSS.MS-PS1-2