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Basic Chemistry Concepts. Structure and function of all living things are governed by the laws of Chemistry Understanding of Chemistry’s fundamental principles provides a better understanding of living things and how they function. Composition of Matter.

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Basic chemistry concepts

Basic ChemistryConcepts

Structure and function of all living things are governed by the laws of Chemistry

Understanding of Chemistry’s fundamental principles provides a better understanding of living things and how they function


Composition of matter
Composition of Matter

  • Everything in the universe is made of matter

  • Matter is anything that has mass and takes up space


Elements
Elements

  • Pure substances that cannot be broken down chemically into simpler kinds of matter

  • Periodic Table gives:

  • Atomic Number

  • Chemical Symbol

  • Atomic Mass



Atoms
Atoms

  • Simplest particle of an element that retains all of the properties of that element

    • Basic building blocks of all matter

  • Contain 3 types of particles:

    • Protons

    • Neutrons

    • Electrons


The nucleus of an atom
The Nucleus of an Atom

  • The central core of an atom

  • Most of the mass is here

  • Contains two kinds of particles

    • Protons: POSITIVE CHARGED PARTICLE

      • All atoms of an element have the same number of protons

      • Number of protons = atomic number

    • Neutrons: NO ELECTRICAL CHARGE

      • Number of protons + neutrons = atomic mass

      • Same element with different neutrons: isotopes


Electrons
Electrons

  • Third type of atomic particle

    • NEGATIVELY CHARGED PARTICLES

  • Very small and move around the nucleus at very high speeds

  • Number electrons = number protons



Compounds
Compounds

  • Pure substances that are made up of atoms of two or more elements that are chemically combined

    • Proportion of each kind of atom is fixed (for example, H2O: chemical formula)


NaCl


Chemical reactions and bonds
Chemical Reactions and Bonds from individual element properties

  • Atoms undergo chemical reactions to become more stable

  • In reactions, chemical bonds are broken, atoms rearranged, and new bonds (or attachments) are formed

  • Metabolism: all of the chemical reactions that occur in an organism

  • Two types of chemical bonds:

    • Covalent Bonds

    • Ionic Bonds


Covalent bonds
Covalent Bonds from individual element properties

  • Two atoms SHARE one or more pairs of electrons

    • Most compounds in organisms have covalent bonds

    • A group of atoms held together by covalent bonds is called a molecule


Ionic bonds
Ionic Bonds from individual element properties

  • Formed by electrical attraction between two oppositely charged ions

    • Ion: atom or molecule with an electrical charge


Energy and chemical reactions
Energy and Chemical Reactions from individual element properties

  • Energy is required to make or break chemical bonds, at least for the reaction to begin

  • Chemical reactions that involve a net release of energy: exergonic reactions

    • May be used to do other work

  • Chemical reactions that involve a net absorption of energy: endergonic reactions


Catalysts in chemical reactions
Catalysts in Chemical Reactions from individual element properties

  • For many compounds, the amount of energy needed to start the reaction (called activation energy) is HIGH

  • Catalysts are chemical substances that reduce the amount of activation energy needed

    • With a catalyst, the reaction may proceed spontaneously or with only small amount of energy

  • Enzymes are important catalysts in living things


Chemical equations
Chemical Equations from individual element properties

  • Shows the changes occurring in a chemical reaction

    • Reactants are on the LEFT side

    • Products are on the RIGHT side


Solutions
Solutions from individual element properties

  • Mixtures in which one or more substances are UNIFORMLY distributed in another substance (example: sugar water)

    • Sugar is the solute (substance dissolved)

    • Water is the solvent (substance in which the solute is dissolved)

  • Aqueous solution: water is the solvent

    • Universally important in living things


Acids and bases
Acids and Bases from individual element properties

  • On ph Scale from 0-14

    • 0 = very acidic (more H+ ions)

    • 7 = neutral

    • 14 = very basic or alkaline (more OH- ions)

  • Buffers neutralize solutions (example of homeostasis in living things)


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