Chemistry

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Chemistry Overiew of Solutions
Chemistry Overiew of Solutions 150 150 Deborah

Overview Many common substances exist as solutions, such as the air we breathe, the water that surrounds us, and brass instruments. Solutions are mixtures of two or more substances that…

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Chemistry Review of Heat in Reactions
Chemistry Review of Heat in Reactions 150 150 Deborah

Overview Many chemical reactions involve heat energy. They either release energy in the form of heat, or absorb energy in the form of heat from the environment. Exothermic and Endothermic…

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Chemistry Review of Molecular Shape and Polarity
Chemistry Review of Molecular Shape and Polarity 150 150 Deborah

Overview Symmetrical molecules tend to follow basic structural shapes, such as linear, planar, tetrahedral, pyramidal, and bent. Some molecules also exhibit polarity, which gives them a distinct positive or negative…

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Chemistry Review of Rates of Reactions
Chemistry Review of Rates of Reactions 150 150 Deborah

Overview Reaction rates in chemistry are based on how fast that reactants turn into products. Some of the elements that affect reaction rates include the nature of the chemicals that…

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How to Prepare a Solution of Proper Concentration
How to Prepare a Solution of Proper Concentration 150 150 Teaching Staff

Overview: When in a chemistry lab or just writing a test, many students struggle with how to create a solution of known concentration. Students find it difficult because they try…

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Determining Oxidation Numbers
Determining Oxidation Numbers 150 150 Teaching Staff

Overview: Balancing REDOX reactions can be more difficult than balancing any normal equation; however, there are steps that you can take to ensure that you do it correctly and end…

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Types of Chemical Reactions
Types of Chemical Reactions 150 150 Teaching Staff

Overview: Chemical reactions occur when two or more elements are introduced to each other. A few molecular and atomic rearrangements occur in order to change our products. There are 5…

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Chemistry Review of Ionic Compounds
Chemistry Review of Ionic Compounds 150 150 Deborah

Overview Some chemical elements use ionic bonds to form compounds.  Those compounds use electrical attraction between elements to maintain chemical bonds, and rules govern which elements gain or lose electrons. …

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Chemistry Review of Covalent Compounds
Chemistry Review of Covalent Compounds 150 150 Deborah

Overview: Many chemical compounds are not formed by ionic bonds, but by covalent bonds, where a number of elements share the same electrons.  Compounds that are formed by covalent bonds…

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Chemistry Review of the Mole
Chemistry Review of the Mole 150 150 Deborah

Overview: Atoms and molecules are so tiny that scientists do not usually measure how many of them are needed in a chemical reaction atom by atom or molecule by molecule. …

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