Chemistry Chapter 8 Review Questions
Terms in this set (19)
List the four observations that indicate that a chemical reaction may have taken place
energy change (light or heat)
formation of precipitant
List the three requirements for a correctly written chemical equation
represent known facts
have correct symbols and formulas
satisfy law of conservation of mass
What is meant by the term coefficient in a chemical equation?
how much the compound is being used in the reaction
What is an aqueous solution?
solution that's dissolved in water
What is a catalyst?
helps speed up reaction
What is a reversible reaction?
a chemical reaction in which the products reform the original reactants
What are the four guidelines useful in balancing an equation?
-identify names of reactants and products
-write formula equation by substituting correct formulas for the names of the reactants in the products
-balance the equation
-count atoms to make sure it is balances
How are most decomposition reactions initiated?
energy in the form of heat or electricity is added
A substance is decomposed by an electric current, what is the nae of this type of reaction?
In what environment do many single replacement reactions commonly occur?
What is it meant by the activity of an element?
a greater activity means a greater ease of loss of electrons to form positive ions
What is an activity series?
a list of elements organized according to the ease with which the elements undergo certain chemical reactions
What is the basis in ordering of the elements on the activity series?
determined by single replacement reactions
What chemical principle is the basis for the activity series of metals?
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