Free Printable INTRODUCTION TO WATER UNIT

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INTRODUCTION TO WATER UNIT

Total questions: 18

Worksheet time: 15mins

Name

Class

Date

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

Adhesion

Cohesion

Refer to the picture; the water strider can walk over waters surface. This is occurring due to:

Adhesion

Cohesion

Water is the universal solvent since it's:

water

such a small molecule

polar

essential to life

A substance made of two or more atoms that are joined together.

Molecule

Element

Meniscus

Surfactant

A substance made of two or more different elements. Example: H₂O, CO₂

Molecule

Compound

Surface Tension

Surfactant

A substance made of two or more different elements. Example: H₂O, CO₂

Molecule

Compound

Surface Tension

Surfactant

Describe COHESION.

Water molecules attracted to other substances.

Water molecules climbing upwards against the force of gravity.

Water molecules dissolving many substances because of its polarity.

Water molecules attracted to other water molecules.

Describe ADHESION.

Water molecules attracted to other substances.

Water molecules climbing upwards against the force of gravity.

Water molecules dissolving many substances because of its polarity.

Water molecules attracted to other water molecules.

Describe SURFACE TENSION.

Water molecules climbing upwards against the force of gravity.

Water molecules dissolving many substances because of its polarity.

Measure of how difficult it is to break the surface of a liquid.

Water molecules attracted to other substances.

10.

What two elements make up water?

Helium and oxygen

Hydrogen and oxygen

helium and carbon

oxygen and carbon

11.

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

cohesion

adhesion

solution

polar molecule

12.

molecule in which opposite ends have opposite electric charges

cohesion

polar molecule

hydrogen bond

solution

13.

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.

14.

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

15.

Water is a universal solvent because it...

It can be found anywhere

It freezes when it gets cold

floats when frozen

Dissolves most substances

16.

Water beads up on the surface of a penny because of this property.

Adhesion

High Surface Tension

Universal Solvent

Changes in Density

17.

A general definition of cohesion is the attraction of:

particles of the same substance

particles of a different substance

particles of both the same and different substances

particles of neither the same or different substances

18.

Which term refers to water having partial positive and a partial negative charge?

cohesion

surface tension

polarity

adhesion

Reset

INTRODUCTION TO WATER UNIT

Total questions: 18

Worksheet time: 15mins

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