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Elements, Compounds and Mixtures. Katina Peck. 3 categories of matter. Elements Compounds Mixtures. H 2 O. Pizza. Cu. Elements. Everything in the Universe is made from about 118 elements. Elements are the building blocks of matter. Cu.

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3 categories of matter
3 categories of matter
  • Elements
  • Compounds
  • Mixtures

H2O

Pizza

Cu

elements
Elements

Everything in the Universe is made from about 118 elements.

  • Elements are the building blocks of matter.

Cu

Each element is made up of the same type of atoms.

compounds
Compounds
  • Compounds are made up of two or more different elements.
  • Compounds have different properties than the elements that make it up.
compounds1
H2OCompounds
  • Each compound is represented by a formula.
              • H2O= 2 Hydrogen & 1 Oxygen, 2:1
              • CO2=1 Carbon & 2 Oxygen, 1:2
              • NaCl= 1 Sodium & 1 Chlorine 1:1
  • Chemically combined in a specific ratio.
compounds2
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.

Subscript

Coefficient

mixture
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.
mixture1
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

molecule
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
            • H2
            • O2
comparison
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.
solution
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

Solution

Solute

Solute

colloids
Colloids
  • A heterogeneous mixture that never settles.
  • Example: Milk
  • Scatters light
suspension
Suspension
  • A heterogeneous mixture that has particles that settle.
  • Example: Italian salad dressing
ad