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Chapter #5

Chemical Reactions and Quantities

QuestionAnswer
A _________ ________ happens when the appearance of a substance is altered, but not its composition. It changes states, but does not change into a new substance. physical change
A ________ _________ happens when reacting substances change into new substances that have different formulas and different properties. chemical change
Is this a physical or chemical change? CL2(g)->Cl2(l) Physical. It simply turned from a gas to a liquid (changed states), but the chemical composition was not altered.
Is this a physical or chemical change? PbO2(s)->Pb(s)+O2(g) A chemical change. The product has a different chemical formula than the reactant. (more specifically, it is a decomposition reaction)
When a chemical equation is ________, the equation shows the same number of atoms for each element on BOTH sides of the equation. balanced
When we see the subscript (aq), we know that the element or compound was: dissolved in water
When we see a triangle symbol over the reaction arrow in a formula, we know it was a _________ reaction. thermal (the reactants are heated)
We use coefficients to balance equations, but the ________ in the formulas are NEVER changed. subscripts
The Law of Conservation of Mass states that mass is neither _________ nor _________ in any ordinary chemical reaction. created / destroyed (in other words, the mass of the substance produced (product) by the chemical reaction is always equal to the mass of the of the reactants.)
What are the coefficients in a balanced chemical equation? Coefficients indicate the number of molecules present of that particular reactant or product.
In an oxidation-reduction reaction, the oxidation half of the reaction is when a reactant ________ electrons, meaning it gets more _________. loses / positive
In an oxidation-reduction reaction, the reduction half of the reaction is when a reactant ________ electrons, meaning it gets more _________. gains / negative
The reactant that RECEIVES the electrons given away by the other reactant is the ___________ __________. oxidizing reactant
The reactant that DONATES the electrons to the other reactant is the _______ _________. reducing reactant.
Created by: taranorwood
 

 



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