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Pure Substances & Mixtures

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Presentation on theme: "Pure Substances & Mixtures"— Presentation transcript:

1 Pure Substances & Mixtures

2 What is a pure substance?

3 Pure Substance A substance in which there is only one type of matter.
The particles of a pure substance are alike no matter where they are found. Ex: Particles of iron in a skillet are the same as the iron particles found in a meteorite

4 Element Is a pure substance that cannot be separated into simpler substances by physical or chemical means. It only has one type of atom.

5 Compounds A pure substance composed of two or more elements that are chemically combined. Salt- Sodium & Chlorine Water- hydrogen & oxygen Sugar- carbon, hydrogen & oxygen Baking soda- sodium, hydrogen, carbon, and oxygen.

6 Compounds aren't Random
The elements that make up a compound join in a specific ratio according to their masses. Water 2 atoms of hydrogen to 1 atom of oxygen (2:1 ratio) Each compound has its own set or identifying properties different from the elements that it is formed from.

7 What is a mixture?

8 Mixture Is a combination of two or more substance that are not chemically combined. The substance in a mixture retain their identity. Ex: pizza, salt water

9 Mixtures are Either: Homogeneous: Have the same appearance and properties throughout the mixture Ex: Solutions- milk, Kool-Aid Heterogeneous : the different components are easily seen. Ex: suspensions- salad dressing, muddy water.

10 How do you separate a mixture?
By: Physical separation (take topping off pizza) Distillation (based on boiling points) A magnet (certain metals) A centrifuge (separates by density) Filter (solid particles) Evaporation (sodium chloride & water)

11 Solutions Are mixtures that appear to be a single substance.
Ex: Salt water, milk They are still composed of two or more substance but they are distributed evenly amongst each other

12 Parts of a Solution Solute- The substance that is dissolved
Ex: salt Solvent- The substance in which the solute is dissolved in. Ex: Water Salt is soluble in water When two liquids or gasses form a solution the substance of greater volume is the solvent.

13 Three factors that speed up dissolving:
- temperature - stirring - particle size

14 More on Mixtures: Concentration: measures the amount of a solute dissolved in a solvent. Solutions can be described as being concentrated or diluted. Solubility: The amount of solute needed to make a saturated solution ( grams/ 100mL) Saturated: A solution that contains all the solute is can hold at a given temperature. Unsaturated: A solution that contains less solute then it can hold at a given temperature.

15 Types of Mixtures: They cannot be separated by
Suspensions: A mixture in which particles or a material are dispersed throughout a liquid or gas but are large enough that they settle out. Colloids: A mixture in which particles are dispersed throughout but are not heavy enough to settle out. Ex: Milk, Jell-O, Fog They cannot be separated by filtration the particles are too small

16 Mixtures Vs. Compounds Mixtures Compounds
Components are elements, compounds, or both. Components are elements. Components keep their original properties. Components lose their original properties. Separated by physical means. Separated by chemical means. Formed using any ratio of components Formed using a set mass ratio of components.

17 Yet Another Way To Classify Matter

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