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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

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?


In an equation, the symbol for a substance in water solution is followed by...


When the equation Fe3O4 + AL (yields) Al2O3 + Fe is correctly balanced, what is the coefficient of Fe?


Which coefficients correctly balance the formula equation NH4NO2 (s) (yields) N2 (g) + H2O (l)?


Which coefficient correctly balance the formula equation CaO2 + H2O (yields) Ca(OH)2?


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...


The replacement of bromine by chlorine in a salt is an example of a single-displacement reaction by


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


If chlorine gas is produced by halogen replacement, the other halogen in the reaction must be


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

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