Chemical Equations

What is a chemical equation

• A chemical equation is a mathematical formula.
• A chemical equation describes the physical state of matter.
• A chemical equation is a graphical representation of molecules.
• A chemical equation represents a chemical reaction using symbols and formulas.

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What is the law of conservation mass

• Mass cannot be created or destroyed in chemical reactions

• Mass is only conserved in physical reactions.
• Mass is lost during physical changes.
• Mass can be created in chemical reactions.

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what is a double replacement reaction

• A double replacement reaction is a process where two elements combine to form a single compound.
• A double replacement reaction involves the combustion of two compounds.
• A double replacement reaction is a chemical reaction where two compounds exchange ions to form two new compounds.
• A double replacement reaction is when one compound decomposes into two simpler substances.

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what is a decomposition reaction

• A decomposition reaction is a reaction in which a compound is broken down into simpler substances.
• A decomposition reaction is a process where energy is absorbed without any change in the substance.
• A decomposition reaction involves the rearrangement of atoms without breaking any bonds.
• A decomposition reaction is when two compounds combine to form a single product.

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what is a combustion reaction

• A combustion reaction is a slow process that absorbs heat and light.
• A combustion reaction occurs only in the absence of oxygen.
• A combustion reaction is a rapid chemical reaction between a fuel and oxygen that produces heat and light.
• A combustion reaction is a type of physical change that does not involve chemical bonds.

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what is a synthesis reaction

• A synthesis reaction involves the exchange of ions between two compounds.
• A synthesis reaction is when a single substance breaks down into two or more products.
• A synthesis reaction is a chemical reaction where two or more substances combine to form a single product.
• A synthesis reaction is a process where energy is released without any chemical change.

what is a single replacement reaction

• A reaction where one element replaces another in a compound.
• A reaction that involves the breaking of chemical bonds without any replacement.
• A reaction where elements are created from compounds.
• A reaction that combines two compounds into one.

what is a neutralization reaction

• A neutralization reaction is the reaction between two acids.
• A neutralization reaction produces only carbon dioxide and water.
• A neutralization reaction is the reaction between an acid and a base to produce water and a salt.
• A neutralization reaction occurs between two bases to form a gas.

what is the difference between an endothermic reaction and an exothermic reaction

• Endothermic reactions release heat; exothermic reactions absorb heat.
• Endothermic reactions absorb heat; exothermic reactions release heat.
• Both reactions absorb heat but differ in speed.
• Endothermic reactions occur only in living organisms; exothermic reactions occur in non-living systems.

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what are clues that indicate a chemical reaction

• Increase in pressure
• Changes in color, temperature, formation of a precipitate, gas production, and changes in odor, sound, light

• Change in mass
• Formation of crystals

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