B water
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B. Water. Needed by but not c reated by living things. Created by living things Contain carbon as central atom Also contain hydrogen. Water – inorganic molecule, essential to ALL life. 1 . Chemistry of Water

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B. Water

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B water

B. Water

  • Needed by but not

  • created by living things

  • Created by living things

  • Contain carbon as central atom

  • Also contain hydrogen


Water inorganic molecule essential to all life

Water – inorganic molecule, essential to ALL life

1. Chemistry of Water

  • Water is bonded by a polar covalent bond = electrons are unequally shared between O and H

  • OVERALL – the molecule has a polar nature

  • Meaning – one end is slightly positive and one end is negative


Water is a bent polar molecule

Water is a bent, polar molecule


2 hydrogen bonding

2. Hydrogen Bonding

  • Between water molecules there are HYDROGEN bonds

  • Definition – H –Bonds

    A chemical bond in which a hydrogen atom of one molecule is attracted to an negative atom, - of another molecule


A properties of water

A. Properties of Water

Adhesiveness

  • Creates surface tension- aquatic insects can travel on surface

    High Specific Heat Capacity

  • help regulate body temperature

  • Water requires a large amount of energy to changes temperature


Properties cont

Properties (cont.)

Universal solvent – water will dissolve many solutes

-blood carries dissolved solutes

-oceans carry dissolved solutes

Transparent in Nature- Aquatic environments for photosynthesis

Lubricant – swallowing, joints


Ii acids bases and buffers

II. Acids, Bases and Buffers

When water DISSOCIATES

H = OH

This is a neutral solution (pH 7)


Acids

Acids

  • When the concentration of the H ion

    is greater than the concentration of the OH ion then we have an acid.

  • Ex. HCl in stomach

  • Ex. Lemon juice

  • How do acids taste??


Bases

Bases

  • When the [ OH] is greater than [H] then we have a base.

  • Ex – ammonia, oven

    cleaner


Ph ph scale

pH & pH Scale

  • is a measure of the concentration of hydrogen ions that are free in a system

  • High [H] LESS pH

  • LowRanges from 0 to 14

    pH Scale

  • 0 to 7 = Acidic

  • 7 = neutral = water

  • 8-14=basic or alkaline


Buffers

Buffers

  • A compound that tends to maintain a solution at a constant pH by accepting or releasing hydrogen ions

  • Ex. Bicarbonate ion


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