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Chemistry Unit2 Part3 - Elements Compounds and Mixtures

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Information about Chemistry Unit2 Part3 - Elements Compounds and Mixtures

Published on October 5, 2007

Author: shawnschlueter

Source: slideshare.net

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Matter and change Unit 2 Part 3 – Elements, Compounds, and Mixtures

TAKS Student Expectation Integrated Physics and Chemistry (7) Science Concepts. The Student knows the relationship between properties and its components. The Student is expected to: (E) Classify samples of matter from everyday life as begin element, compounds, or mixtures.

Integrated Physics and Chemistry (7) Science Concepts. The Student knows the relationship between properties and its components. The Student is expected to:

(E) Classify samples of matter from everyday life as begin element, compounds, or mixtures.

Mixtures Mixture – two or more substance that can be separated by physical means

Mixture – two or more substance that can be separated by physical means

Physical types of separation Filtration to separate a solid from a liquid.

Physical types of separation

Filtration to separate a solid from a liquid.

Distillation to separate a pure liquid from dissolved solid impurities which have a very high boiling point.

Distillation to separate a pure liquid from dissolved solid impurities which have a very high boiling point.

Fractional distillation to separate liquids with a range of different boiling points, especially if relatively close together.

Fractional distillation to separate liquids with a range of different boiling points, especially if relatively close together.

Evaporation to remove a solvent to leave a solid behind. Crystallization to get a pure solid out of a solvent solution of it.

Evaporation to remove a solvent to leave a solid behind.

Crystallization to get a pure solid out of a solvent solution of it.

Chromatography – separate mixtures based on the different masses of substances.

Chromatography – separate mixtures based on the different masses of substances.

Types of mixtures Heterogeneous – suspensions, colloids Homogeneous – solutions

Types of mixtures

Heterogeneous – suspensions, colloids

Homogeneous – solutions

Pure Substances Pure - only one substance is present in the material. Has a constant (fixed) melting and boiling point.

Pure - only one substance is present in the material.

Has a constant (fixed) melting and boiling point.

Compounds Compound – a pure substance that cannot be broken down by physical change, but can be broken down by chemical change. 2 Types Molecules – atoms of the compounds share electrons. Formulas – atoms in the compound exchange electrons.

Compound – a pure substance that cannot be broken down by physical change, but can be broken down by chemical change.

2 Types

Molecules – atoms of the compounds share electrons.

Formulas – atoms in the compound exchange electrons.

Compounds obey the Law of Definite Proportion 1794 - John Louis Proust (France) publishes work. Accepted by scientific community in 1811. Law states in a pure compound, the elements combine in definite proportions to each other by mass Ex: water is always 88.81% Oxygen to 11.19% Hydrogen

Compounds obey the Law of Definite Proportion

1794 - John Louis Proust (France) publishes work. Accepted by scientific community in 1811.

Law states in a pure compound, the elements combine in definite proportions to each other by mass

Ex: water is always 88.81% Oxygen to 11.19% Hydrogen

Elements element – a substance that cannot be broken down into other substances by chemical change or a physical change. Elements typically contains only one kind of an atom. (although certain compounds, like oxygen, can be a compound of itself) All known elements are listed on the Periodic Table.

element – a substance that cannot be broken down into other substances by chemical change or a physical change.

Elements typically contains only one kind of an atom. (although certain compounds, like oxygen, can be a compound of itself)

All known elements are listed on the Periodic Table.

Putting it all together Draw the following diagram which ties together mixtures and pure substances

Draw the following diagram which ties together mixtures and pure substances

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