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50 terms

Chemistry Chapter 8 Review

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In the equation 2Al(s)+3Fe(N03)2(aq)=3Fe(s) + 2Al(NO3)3(aq), iron has been replaced by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