Chemical reactions

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What are exothermic reactions?

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Exothermic reactions are chemical reactions that release energy, usually in the form of heat.

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NGSS.HS-PS1-4

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What are endothermic processes?

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Endothermic processes are reactions that absorb energy from their surroundings, often resulting in a temperature decrease.

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NGSS.HS-PS1-4

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What happens to heat in an endothermic reaction?

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In an endothermic reaction, heat is taken in or absorbed.

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NGSS.HS-PS1-4

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What is the difference between a chemical change and a physical change?

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A chemical change results in the formation of new substances, while a physical change alters the form or appearance of a substance without changing its chemical composition.

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NGSS.MS-PS1-1

NGSS.MS-PS1-4

NGSS.MS-PS1-5

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What type of reaction is the melting of ice?

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The melting of ice is a physical change.

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

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What is complete combustion?

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Complete combustion is a chemical reaction where a substance reacts with oxygen to produce carbon dioxide and water, releasing energy.

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NGSS.HS-PS1-4

NGSS.HS-PS3-1

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What is the general equation for complete combustion of hydrocarbons?

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The general equation is: Hydrocarbon + O2 → CO2 + H2O.

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NGSS.HS-PS1-7

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What is a decomposition reaction?

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A decomposition reaction is a type of chemical reaction where a single compound breaks down into two or more simpler products.

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NGSS.MS-PS1-5

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What is a synthesis reaction?

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A synthesis reaction is a type of chemical reaction where two or more reactants combine to form a single product.

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NGSS.MS-PS1-1

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What is a double replacement reaction?

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A double replacement reaction is a type of chemical reaction where two compounds exchange ions to form two new compounds.