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Elements, Compounds and Mixtures

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Presentation on theme: "Elements, Compounds and Mixtures"— Presentation transcript:

1 Elements, Compounds and Mixtures
Oh My!

2 Atoms vs. Molecules Review: What is an atom?
The smallest part of an element Some atoms are single and other atoms are coupled together. When 2 or more atoms are coupled together, they are called molecules. What is the difference between atoms and molecules? Atoms are single (just 1) Molecules are couples (more than 2 atoms) Atoms vs. Molecules

3 Molecules Just like elements, molecules are represented by symbols.
Sometimes molecules are made of atoms that are the same The oxygen molecule: has 2 atoms of the element oxygen Symbol: O2 Sometimes molecules are made of atoms that are different A water molecule: has 2 atoms of the element hydrogen and 1 atom of the element oxygen Symbol: H2O Molecules

4 When everything is the same, it is called a pure substance
All the particles in pure gold are gold atoms. All the particles in pure water are water molecules. Pure Substance Meet the Elements

5 If the atoms in a material are all the same (1 type), the material is an element
Cannot be broken down into simpler substances Properties don’t change Examples: oxygen, hydrogen, sodium, chlorine, carbon Elements Are Pure

6 If you have 2 or more elements (different types of atoms) chemically combined = compound
Can be separated chemically The elements that form a compound do not keep their individual properties- A new substance with completely different properties is formed Examples: water, salt, sugar, carbon dioxide gas Compounds are always molecules because they have more than 2 different atoms and a molecule is 2 or more atoms Compounds Are Pure

7 Sodium (Na) is a soft metal that explodes when combined with water
Chlorine (Cl) is a poisonous gas But when chemically combined we get an edible, white solid that we know as table salt (NaCl) Molecule/compound activity Water (H2O) = 2 gases form a liquid Compounds

8 are always are always combine to form are made of 2 or more
can be in the form of are always

9 Mixtures are 2 or more substances (can be elements or compounds or both) that are physically together The components of a mixture can be separated physically Each part of the mixture keeps its individual properties Examples: trail mix, salt water (NaCl + H2O) Which one is which interactive activity Mixtures Are Not Pure

10 2 Types of Mixtures Heterogeneous: Homogenous: Means "different"
Unevenly mixed throughout the substance Pizza Salsa Chicken soup Chex mix Homogenous: Means "the same" Evenly mixed throughout the substance Kool-Aid Lemonade Tea/coffee Salt water 2 Types of Mixtures

11 Matter Elements Compounds Mixtures
Made of 2 or more elements chemically together Can be separated chemically Examples: Water (H2O) Made of 1 type of atom Cannot be separated Example: Hydrogen (H), Oxygen (O) Pure substances Matter 2 or more substances Properties don’t change Made of 2 or more substances physically together Can be separated physically Example: salt water (NaCl + H2O) Mixtures

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