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ELEMENTS, COMPOUNDS AND MIXTURES KATINA PECK. 3 CATEGORIES OF MATTER Elements Compounds Mixtures Cu H2OH2O Pizza.

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Presentation on theme: "ELEMENTS, COMPOUNDS AND MIXTURES KATINA PECK. 3 CATEGORIES OF MATTER Elements Compounds Mixtures Cu H2OH2O Pizza."— Presentation transcript:

1 ELEMENTS, COMPOUNDS AND MIXTURES KATINA PECK

2 3 CATEGORIES OF MATTER Elements Compounds Mixtures Cu H2OH2O Pizza

3 ELEMENTS Elements are the building blocks of matter. Cu Everything in the Universe is made from about 118 elements. Each element is made up of the same type of atoms.

4 COMPOUNDS Compounds are made up of two or more different elements. Compounds have different properties than the elements that make it up.

5 COMPOUNDS Each compound is represented by a formula.  H 2 O= 2 Hydrogen & 1 Oxygen, 2:1  CO 2= 1 Carbon & 2 Oxygen, 1:2  NaCl= 1 Sodium & 1 Chlorine 1:1 Chemically combined in a specific ratio. H2OH2O

6 COMPOUNDS Formulas are made of the symbols and a subscript number. The subscript is the number of atoms of that element. A coefficient tells us how many molecules there are. Coefficient Subscript

7 MIXTURE Most of the matter in the Universe is a compound or a mixture. A mixture is made of two or more substances that are not chemically combined. Substances in a mixture retain their properties.

8 MIXTURE Two types of mixtures: Heterogeneous  Substances in the mixture are easily distinguished.  Pizza, trail mix, Italian salad dressing Homogeneous  Two or more substances are uniformly mixed.  Salt water, the air we breath, soft drinks Heterogeneous Homogeneous

9 MOLECULE A molecule is formed when two or more atoms join together chemically. If the molecule is made of two atoms of the same element, it is called a diatomic atom.  Di- two  Atomic- atom  Two atoms  H 2  O 2

10 COMPARISON A molecule is formed when two or more atoms join together chemically. A compound contains at least two different elements. All compounds are elements, but not all elements are compounds.

11 SOLUTION A homogeneous mixture. Solute- the substance being dissolved. Solvent- the substance that dissolves a solute. Solubility- the amount of solute that will dissolve in a solvent. Solvent Solute Solution Solute

12 COLLOIDS A heterogeneous mixture that never settles. Example: Milk Scatters light

13 SUSPENSION A heterogeneous mixture that has particles that settle. Example: Italian salad dressing


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