Chemistry Chapter 8 Review
The reaction represented by the equation 2KClO3(s)=2KCl(s)+3O2(g) is a
decomposition reaction
The equation AX=A+X is the general equation for
decomposition reactions
The equation AX+BY=AY+BX is the general equation for a
double-displacement reaction
The decomposition of a substance by an electric current is called
electrolysis
If chlorine gas is produced by halogen replacement, the other halogen in the reaction must be
fluorine
If a certain metal is placed in an ionic solution containing another metal and no reaction occurs, then the solution is
higher on the activity series
Active metals react with certain acids, such as hydrochloric acid, to yield a metal compound and
hydrogen
Magnesium hydroxide decomposes to yield magnesium oxide and
hydrogen
If metal X is higher than metal Y in the activity series, then metal X
loses electrons more readily than does the metal Y
Group 1 metals react with water to produce hydrogen and
metal hydroxides
When heated, metallic cholrates decompose into
metallic chlorides and oxygen
In one type of synthesis reaction, an element combines with oxygen to yield a(n)
oxide
When potassium reacts with water, one product formed is
potassium hydroxide
An active metal and a halogen react to form a
salt
A chemical equation is balanced when the
same number of each kind of atom appears in the reactants and in the products
The equation of A+BX = AX+B is the general equation for a
single displacement reaction
The reaction represented by the equation Ca(s) + 2HCl(aq) = H2(g) + CaCl2(aq) is a
single displacement reaction
When sodium chlorate decomposes, the products are
sodium chloride and oxygen
The equation A + X = AX is the general equation for a
synthesis reaction
The reaction represented by the equation 2Mg(s) + O2(g) = 2MgO(s) is a
synthesis reaction
In a chemical reaction,
the mass of the reactants equals the mass of the products.
The word equation solid carbon + oxygen gas = carbox dioxide gas + energy represents a chemical reaction because
the reaction releases energy
In a double-displacement reaction, hydrogen chloride and sodium hydroxide react to produce sodium chloride. Another product is
water!
In an equation, the symbol for a substance in gaseous form is followed by
(g)
Which coefficients correctly balance the formula equation NH4NO2(s) = N2(g) +H20(l)
112
What is the balanced equation when aluminum reacts with copper(II) sulfate?
2AL + 3CuSO4 = Al2(SO4)3+3Cu
Which equation is not balanced?
2H2+o2=H20
Which reaction can be predicted from the activity series?
2H20(aq) + 2Na(s) = 2NaOH(aq) +H2 (g)
Which reaction does not occur?
2HF(aq)+ Cl2(g) = F2(g) + 2HCl(aq)
When the equation Fe3O4 + Al = Al2O3 + Fe is correctly balanced, what is the coefficient of Al?
4
What is the name of a list of elements arranged according to the ease with which they undergo certain chemical reactions?
Activity series
Which of the following is a formula equation for the formation of carbon dioxide from carbon and oxygen?
C + O2 = CO2
Calcium bromide (aq) + chlorine (g) yields
CaCl2(aq) and Br(2)
Which observation does not indicate that a chemical reaction has occurred?
Change in total mass of substances
What is the small whole number that appears in front of a formula in a chemical equation?
Coefficient
In writing a chemical equation that produces hydrogen gas, the correct representation of hydrogen gas is
H2
Predict the product of the reaction represented by the following equation
MgCO3
Predict what happens when magnesium metal is added to a solution of calcium chloride
NO REACTION OCCURS
In the word equation, sodium oxide + water = sodium hydroxide, the formula for sodium hydroxide is represented by
NaOH
Predict what happens when potassium is added to a solution of nickel chloride
Potassium chloride forms
In what kind of reaction do two or more substances combine to form a new compound?
Synthesis reaction
When a binary compound decomposes, what does it produce?
Two elements
What can be predicted by using an activity series?
Whether a certain chemical reaction will occur
When a metal chlorate is heated, it decomposes to yield oxygen and
a metal chloride
When heated, a metal carbonate decomposes itno carbon dioxide and
a metal oxide
After the first steps in writing an equation, the equation is balanced by
adjusting coefficients to the smallest whole-number ratio
In the equation 2Al(s)+3Fe(N03)2(aq)=3Fe(s) + 2Al(NO3)3(aq), iron has been replaced by
aluminum
An element in the activity series can replace any element
below it on the list
An insoluble gas that forms in a double-displacement reaction in aqueous solution
bubbles out of solution
To balance a chemical equation, it may be necessary to adjust the
coefficients