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The College Board

College Board Online:ap Chemistry

For Students 9th - 10th
The official AP chemistry site by the College Board. Check here for format, calculator usage, and time constraints, as well as sample tests.
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Frostburg State University

Frostburg State University: General Chemistry Online

For Students 9th - 10th
Resource provides information about calculating molality.
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Other

Brinkster: All About Mole Calculations

For Students 9th - 10th
Step by step instructions on how to solve mole problems in chemistry. Examples are included, along with diagrams and detailed explanations.
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Frostburg State University

General Chemistry Online: Faq: Acids and Bases

For Students 9th - 10th
Click the basic questions regarding acids, bases, and pH to view the answers. There are sections on basic concepts, buffer solutions, pH calculation, equilibrium constants, indicators, neutralization reactions, and titrations.
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Environduck

Enviroduck: Math and Chemistry Behind Co2 Per Gallon of Gas Calculations

For Students 9th - 10th
Learn how CO2 per gallon of gas is calculated using science, math, and chemistry.
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Khan Academy

Khan Academy: Heat and Temperature

For Students 9th - 10th
An explanation of using heat capacity to calculate heat.