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What is an element? Element: Is a pure substance that cannot be broken down into other substances by chemical or physical means. Gold( Au) Silver(AG)
Elements are the simplest of substances
It is made up of only one kind of atom. (EG) Aluminum, Zinc & Copper (Pennies) Nitrogen, Oxygen, & Hydrogen
Can be identified by its chemical and physical properties
Particles of Elements-Atoms Atom: Is the basic particle from which all elements are made.
Made up of protons, neutrons, and electrons
Different elements have different atoms, henceforth, different properties Lead(Pb) Oxygen(O)
(EG) Carbon: A carbon atom has a positively charged center, or nucleus, that contains smaller particles; a cloud of negative charge surrounds it. Fig 5 p. 39
When atoms Combine Chemical bonds: When atoms combine Water
Molecules: Groups of two or more atoms held together by chemical bonds
(EG) Water: A molecule of water consists of an oxyge atom chemically bonded to two hydrogen atoms.
Two atoms of the same element can also combine to form a molecule (EG) Oxygen molecules consist of two oxygen atoms O₂ O₃
Ionic Bond forms by attraction of opposite charges of valance electrons NaCl: salt
Covalent Bond forms by sharing of valance electrons N₂
Compounds Compound: Is a pure substance made of two or more elements chemically combined in a set ratio
Chemical formula: shows the elements in the compound and the ratio of atoms
When elements are chemically combined, they form compounds having properties that are different from those of the uncombined elements
Carbon Dioxide: Its chemical formula is CO 2. The number 2 below the oxygen tells you the ratio of carbon to oxygen, 2 to 1 (If there is no number after the symbol, the number 1 is understood).
Different ratios mean different compounds (EG) CO
Atoms, Elements, Compounds, and Ions Atom basic building block of all matter Element Substance that consists of only one type of atom. Molecule has two.
BASIC CHEMISTRY. Why study Chemistry in Biology? Biology - study of LIFE! Biology - study of LIFE! Chemistry - part of chemistry deals with chemical compounds….
An atom –smallest basic unit of matter
Biochemistry 2.1. Matter Chemical changes in matter are essential to all life processes. Matter: Anything that occupies space and has mass. Mass: The.
Atoms Elements Molecules Compounds Pure Substance Mixture Solution.
Chemistry of Life. Everything, whether it is a rock, dog, car, or flower, is made of incredibly small particles called __________. atoms.
CHAPTER 6 – THE CHEMISTRY OF LIFE
Chapter B-1 Lesson 1 What are elements?. Matter Matter is anything that takes up space and has mass. (weight on Earth)
Notes 2-1 DESCRIBING MATTER.
Tech Notes: Why Atoms Combine Molecule and Compound: Two or more atoms chemically combined Have completely different properties than those of the.
BASIC CHEMISTRY. Why study Chemistry in Biology? Biology - study of LIFE! Chemistry - part of chemistry deals with chemical compounds…. And chemical compounds.
DESCRIBING MATTER. Anything that has mass and takes up space Substance - single kind of matter that has a specific make-up and specific properties Example:
SPONCH What is SPONCH? SPONCH S= Sulfur P= Phosphorus O= Oxygen N= Nitrogen C= Carbon H= Hydrogen 6 most important elements to life.
Atoms, Elements, & Compounds Biology II D. Mitchell.
Chapter 3.1 Chemistry of Life…. Atom – basic unit of matter It is the simplest unit of matter with its own physical and chemical properties Made up of.
Elements & Bonding. I. Elements of Life A. All organisms in diverse forms are composed of matter. – 1. Matter is made up of elements; which are substances.
Objective: To describe how atoms bond together to form compounds using valence electrons Journal: ◦ How many protons, neutrons and electrons are in.
Parts of an Atom. What is an atom? Atoms are the fundamental building blocks of all things Atoms are the most basic unit of matter Atoms contain three.
Physical Science 101. Atom the basic building block of all matter one single “unit” of an element Examples: a Hydrogen atom, a Nitrogen atom.
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