2.2 - Properties of Waters Flashcards Preview

Biology - Chapter 2 Chemisty Of Life > 2.2 - Properties of Waters > Flashcards

Flashcards in 2.2 - Properties of Waters Deck (31):
1

What is a hydrogen bond?

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

2

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

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

3

How much of your body is water?

70% or 2/3 of molecules

4

Why is water so important for life?

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

5

What is cohesion?

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

6

What causes surface tension?

Cohesion

7

Why can an insect walk on water?

Cohesion/surface tension

8

What is adhesion?

The attraction between different substances

9

What does surface tension prevent?

Prevents the surface of water from stretching or breaking easily

10

What is capillary action?

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

11

What powers capillary action?

Adhesion.

12

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

High

13

What is a mixture?

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

14

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

Solutions and suspensions

15

What is a solution?

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

16

What is a solute?

The substance that is dissolved

17

What is a solvent?

The substance in which the solute dissolves

18

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

Both ionic compounds and other polar molecules

19

In salt water what is the solute?

The salt

20

In salt water what is the solvent?

The water

21

Do nonpolar molecules dissolve well in water?

No

22

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

Saturated

23

What are suspensions?

Mixture of water and non-dissolved materials

24

What is the pH scale?

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

25

What is the pH scale ranges

0 to 14

26

What is pure waters pH number?

Seven

27

Solution with a pH below seven are called what?

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

28

What is a solution with a pH above seven called?

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

29

What is an acid?

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

30

What is a base?

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

31

What is a example of a strong base?

Lye commonly used in soap making