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Ch. 8 Chemistry Test (honors)
If you do the test, it is best not to do the written answers because it comes out weird. Matcing, Multiple choice, and true/false questions are best.
In a chemical reaction...
the mass of the reactants equals the mass of the products
Which observation does NOT indicate that a chemical reaction has occurred?
D. change in total mass of substances
D. change in total mass of substances
change in total mass of substances
When a solid produced by a chemical reaction seperates from the solution it is called
A precipitate
Which word equation represents the reaction that produces water from hydrogen and oxygen?
Hydrogen plus oxygen yields water
How would oxygen be represented in the formula equation for the reaction of methane and oxygen to ield carbon dioxide and water?
O2
In an equation, the symbol for a substance in water solution is followed by...
(aq)
When the equation Fe3O4 + AL (yields) Al2O3 + Fe is correctly balanced, what is the coefficient of Fe?
9
Which coefficients correctly balance the formula equation NH4NO2 (s) (yields) N2 (g) + H2O (l)?
1,1,2
Which coefficient correctly balance the formula equation CaO2 + H2O (yields) Ca(OH)2?
1,1,1
The reaction represented by the equation 2Mg(s) + O2 (g) (yields) 2MgO (s) is what kind of reaction?
Synthesis reaction
The reaction represented by the equation Mg (s) + 2HCl (aq) (yields) H2 + MgCl2 is what kind of reaction?
Single-displacement reaction
The reaction represented by the equation 2HgO (s) (yields) 2Hg (l) + O2 (g) is what kind of reaction?
decomposition reaction
The reaction represented by the equation Pb(NO3)2 (aq) + 2KI (aq) (yields) PbI2 (s) + 2KNO3 (aq) is what kind of reaction?
double-displacement reaction
The reaction represented by the equation 2KClO3 (s) (yields) 2Kcl (s) + 3O2 (gas) is what kind of reaction?
Decomposition reaction
The decomposition of a substance by an electric current is called...
Electrolysis
The replacement of bromine by chlorine in a salt is an example of a single-displacement reaction by
halogens
When a slightly soluble solid compound is produced in a double-displacement reaction, a
precipitate is formed
An insoluble gas that forms in a double-displacement reaction in aqueous solution
bubbles out of solution
In a double-displacement reaction, hydrogen chloride and sodium hydroxide react to produce sodium chloride. Another product is
water
If chlorine gas is produced by halogen replacement, the other halogen in the reaction must be
fluorine
The formulas for the product of the reaction between sodium hydroxide and sulfuric acid are
Na2SO4 and H2O
What is the balanced equation when aluminum reacts with copper(II) sulfate?
2Al + 3CuSO4 (yields) Al2(SO4)3 + 3Cu
The activity series of metals indicated the ease with which metal
atoms lose electrons
Predict what happens when zinc is added to water
no reaction occurs
Predict what happens when lead is added to nitric acid
hydrogen is released
Predict what happens when nickel is added to a solution of potassium chloride
no reaction occurs