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Which increases the rate of a chemical reaction?

Aa catalyst
Ba higher volume
Ca lower pressure
Da lower temperature user: how does a catalyst appear in a chemical equation?
Ait does not usually appear in an equation.
Bit only appears on the product side of an equation.
Cit only appears on the reactant side of an equation.
Dit appears on both the reactant and product sides of an equation.

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JonHenderson55

Answers: 
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1) Which increase the rate of a chemical reaction?
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Answer:  [A]:  a catalyst .
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Note:  A catalyst increases the rate of chemical reaction without altering the chemical reaction itself.
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2) How does a catalyst appear in a chemical equation?
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Answer:  [A]: it uses does usually appear in an equation.
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Note: Since a catalyst is not used up or changed during the chemical reaction, catalysts usually do not appear in a chemical equation.
   {Occasionally, the catalyst is denoted above the "arrow" in the chemical equation, for emphasis that the catalyst was used."}.
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