2.2 - Properties of Waters

Question 1

What is a hydrogen bond?

Answer 1

A weak chemical attraction between polar molecules between a partial positive charge and a partial negative charge

Question 2

A molecule in which the charges are evenly distributed is said to be what?

Answer 2

Polar because a molecule is a bit like a magnet with two poles A positive end and a negative end

Question 3

How much of your body is water?

Answer 3

70% or 2/3 of molecules

Question 4

Why is water so important for life?

Answer 4

Water stores heat efficiently, water helps cells maintain temperature by sweating, water bonds easily to it self and other substances

Question 5

What is cohesion?

Answer 5

It is an attraction between substances of the same kind caused by the hydrogen bond

Question 6

What causes surface tension?

Answer 6

Cohesion

Question 7

Why can an insect walk on water?

Answer 7

Cohesion/surface tension

Question 8

What is adhesion?

Answer 8

The attraction between different substances

Question 9

What does surface tension prevent?

Answer 9

Prevents the surface of water from stretching or breaking easily

Question 10

What is capillary action?

Answer 10

Is when one of the forces draws water out of the roots of a plant and up into stems and leaves

Question 11

What powers capillary action?

Answer 11

Adhesion.

Question 12

Waters heat capacity the amount of heat energy required to increase his temperature is relatively high or low?

Answer 12

High

Question 13

What is a mixture?

Answer 13

It is a material composed of two or more elements or compounds that are physically mixed together but not chemically combined

Question 14

What are two types of mixtures that can be made with water?

Answer 14

Solutions and suspensions

Question 15

What is a solution?

Answer 15

Mixture of one or more substances that is evenly distributed in another substance

Question 16

What is a solute?

Answer 16

The substance that is dissolved

Question 17

What is a solvent?

Answer 17

The substance in which the solute dissolves

Question 18

Waters player that he gives it to ability to dissolve what?

Answer 18

Both ionic compounds and other polar molecules

Question 19

In salt water what is the solute?

Answer 19

The salt

Question 20

In salt water what is the solvent?

Answer 20

The water

Question 21

Do nonpolar molecules dissolve well in water?

Answer 21

No

Question 22

When an amount of water has dissolved all the salute it can it is said to be what?

Answer 22

Saturated

Question 23

What are suspensions?

Answer 23

Mixture of water and non-dissolved materials

Question 24

What is the pH scale?

Answer 24

The measurement system used to indicate the concentration of H positive ions in solution

Question 25

What is the pH scale ranges

Answer 25

0 to 14

Question 26

What is pure waters pH number?

Answer 26

Seven

Question 27

Solution with a pH below seven are called what?

Answer 27

Acidic because they have more H positive ions than OH negative ions

Question 28

What is a solution with a pH above seven called?

Answer 28

Basic because they have more OH negative ions than H positive ions

Question 29

What is an acid?

Answer 29

A compound that forms H positive ions in a solution when dissolved in water

Question 30

What is a base?

Answer 30

A compound that produces OH negative ions in the solution when dissolved in water

Question 31

What is a example of a strong base?

Answer 31

Lye commonly used in soap making