6. Reactions

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Last updated 3:50 AM on 6/22/26
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11 Terms

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Law of Conservation of Mass

M of the reactants = M of the products

<p>M of the reactants = M of the products</p>
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Physical Change

  • Change in state, colour, shape

  • NO NEW COMPOUNDS

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Chemical Change

  • New Compounds or Elements formed

  • Change in colour, gases produced, burning.

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Exothermic Reaction

  • Reaction that releases heat

Ex: Combustion

<ul><li><p>Reaction that releases heat</p></li></ul><p>Ex: Combustion</p>
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Endothermic Reaction

  • Reaction that absorbs heat

Ex: Cold Pack

<ul><li><p>Reaction that absorbs heat</p></li></ul><p>Ex: Cold Pack</p>
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Synthesis

2 Elements combine to form a compound

A + B → AB

Mg + O2 → 2MgO

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Decomposition

A compound is broken down into its elements

AB → A + B

2Fe2O3 → 4F + 3O2

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Hydrocarbon Combustion

A compound with Carbon + Hydrogen reacts with Oxygen to produce CO2 and H2O

C4H10 + 13O2 → 8CO2 + 10H2O

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Single Replacement

Element reacting with a compound

Metals and NonMetals trade places

2Al +3CuCl2 → 3Cu + 2AlCl3

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Double Replacement

2 Compounds react

The cations+ and anions- trade places

Pb(NO3)2 + 2KI → PbI2 +2KNO3

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Neutralization

Acid(H) + Base(OH) react to for a salt(ionic compound) and water

HCl + NaOH → H2O + NaCl