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18 Cards in this Set
- Front
- Back
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What are the markers that provide evidence of a chemical reaction?
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1. A color change
2. The formation of a solid in a previously clear solution. 3. The formation of a gas when you add a substance to a solution. 4. The emission of light. 5. The emission or absoroption of heat. |
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Steps to balance chemical equations.
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1. If an element occurs in only one compound on both sides of the equation balance it first. If there is more than one such element balance metals before nonmetals.
2. If an element occurs as a free element on either side of the chemical equation balance it last. Always balance free elements by adjusting the coefficient on the free element. 3. If the balanced equation contains coefficient fractions clear these by multiplying the entire equation by the appropriate factor. 4. Check to make sure it is balanced by summing the total number of each type of atom on both sides of the equation. |
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Precipitate reactions.
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reactions that form a solid or precipitate upon mixing two aqueous solutions.
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Molecular Equation
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AN equation showing the complete neutral formula for every compound in the reaction.
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Complete ionic equations
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Equations showing the reactants and products as tehy are actually present in the solution.
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Net ionic equations
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Equations that only show the things that are used and made in the reaction. Only show what participates in the reaction.
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Acid base reactions
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Reactions that form water upon mixing an acid and a base. They generally form water and an ionic compound that usually remains dissolved in the solution.
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Gas evolution reactions
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Reactions that evolve a gas.
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REDOX reactions
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Oxidation reduction reactions involve the transfer of electrons. A substance reacts with elemental oxygen, a metal reacts with a nonmetal, more generally, one substance transfers electrons to another substance.
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Combustion reactions
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Characterized by the reaction of a substance with O2 to form one or more oxygen containing compounds often including water. Combustion reactions are exothermic, they emit heat.
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A+B=AB
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synthesis or combination
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AB=A+B
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Decomposition
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A+BC=AC+B
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Displacement
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AB+CD=AD+CB
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Double displacement
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Synthesis or combination reactions
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Simple substances combine to make more complex substances.
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Decomposition reactions
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A complex substance decomposes to form simpler substances such as elements. Decomp reactions require energy in the form of heat, electrical current, or light to make them happen because compounds are normally stable and energy is required to decompose them.
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Displacement reactions
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One element displaces another in a compound. Ex.
Mg+2HCL=MgCl2+H2 |
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Double displacement
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Two elements or groups of elements in two different compounds exchange places to form two new compounds.
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