Agenda: 1. Notes: Bonds, pH and inorganic compounds 2. Bonds Foldable

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Presentation transcript:

Agenda: 1. Notes: Bonds, pH and inorganic compounds 2. Bonds Foldable Day 14 Agenda: 1. Notes: Bonds, pH and inorganic compounds 2. Bonds Foldable

Bell Ringer Copy and label the diagram

Compounds – matter that is made of more than one kind of ATOM Compounds are made by atoms sharing or taking ELECTRONS from other atom

Ionic bond—electrons from one atom are donated to another Covalent bond—electrons are shared between atoms

Chemical reactions occur when bonds are FORMED or BROKEN. This causes them to recombine into different substances.

Metabolism All reactions that occur in an organisms. Break down and build molecules important to life.

Organic: contains carbon (exception: CO2 is not organic) Compounds Organic: contains carbon (exception: CO2 is not organic) Inorganic: does not contain carbon

Each molecule is made of two HYDROGEN atoms and one OXYGEN atom Inorganic Compounds Water ( H2O ) Each molecule is made of two HYDROGEN atoms and one OXYGEN atom

Water –H20

Water forms weak Hydrogen bonds between molecules Water forms weak Hydrogen bonds between molecules. -Positive hydrogen is attracted to negative oxygen.

Water: Hydrogen bond

Why is water so important to life? At least 75% of animal body mass is water Plants contain 70-80% water Transports nutrients and wastes

Why is water so important to life? Dissolves compounds -- “Universal Solvent” Regulates body temperature in animals Provides structure for plants

The pH Scale pH scale ranges from 0 -14 pH 7 is neutral; neither acid nor base Pure water is pH 7 Low pH (0-6.9) = acid High pH (7.1-14) = base The closer to the ends of the scale, the stronger the solution is

Acids Often taste sour Strong acids can burn skin & eyes Strong acids can dissolve metals Examples: Lemon juice Vinegar Car battery acid (dangerous!)

Bases Can taste bitter, sweetish, or salty Strong bases can burn skin & eyes Bases react more easily with protein than with metal; they are often used for cleaning Examples: Milk Baking soda Soap Drain cleaner (dangerous!)

0--------------7---------------14 Acid Any substance which has a pH of value of less than 7 is considered an acid 0--------------7---------------14 Acid Neutral Base

0--------------7---------------14 Base Any substance which has pH value greater than 7 is a base 0--------------7---------------14 Acid Neutral Base

pH 7 A pH of 7 is called neutral—neither acid nor base. 0------------7------------14 Acid Neutral Base