Chemistry Final Exam Review CH.8
In an equation, the symbol for a substance in a water solution is followed by
(aq).
Which coefficients correctly balance the formula equation NH4No2(s) yields N2(g) + H20(l)?
1,1,2
What is the balanced equation when aluminum reacts with copper(II) sulfate?
2Al + 3CuSo4 yields Al2(SO)4 + 3 Cu
When the equation Fe3O4 + Al2O3 + Fe is correctly balanced, what is the coefficient of Fe?
9
Magnesium Bromide(aq) +chlorine(g) yields
MgCl2(aq) and Br2(l).
Predict the product of the reaction represented by the following equation: MgO +CO2
MgO+CO3
In the word equation, sodium oxide +water produces sodium hydroxide, the formula for sodium hydroxide is represented by
NaOH
When a binary compound decomposes, what is produced?
Two elements
Predict what happens when calcium metal is added to a solution of magnesium chloride
calcium chloride forms
When heated, a metal carbonate decomposes into a metal oxide and
carbon oxide
If chlorine gas is produced by halogen replacement, the other halogen in the reaction must be
fluorine
When heated, metallic chlorates decompose into
metallic chlorides and oxygen
The reaction represented by the equation Cl2(g) + 2KBr(aq) yields 2KCl(aq) + Br2(l) is
single-displacement reaction
Which equation is not balanced?
2H2 + O2 yields H2O
in writing a chemical equation that produces hydrogen gas, the correct representation of hydrogen gas is
H2
The formulas for the products of the reaction between sodium hydroxide and sulfuric acid are
Na2So4 and H2O
When a binary compound decomposes, what is produced?
Two elements.
The complete balanced equation for the reaction between zing hydroxide and acetic acid is
Zn(OH)2 + 2CH3COOH yields Zn(CH3COO)2 +2H20
a chemical forrmula wirrten over the arrow in a chemical equation signifies
a catalyst for the reaction
The ability of an element to react is the element's
activity
An element in the activity series can replace any element
below it on the list
The reaction represented by the equation 2HgO(s) yields 2Hg(l) + O2(g) is a
decomposition reaction
The reaction represented by the equation 2KClO3(s) yields 2KCl(s) +3O2(g) is a
decomposition reaction
The reaction represented by the equation Pb(NO3)2(aq) + 2KI(aq) yields PbI2(s) +2KNO3(aq) is a
double-displacement reaction
When potassium reacts with water, one product formed is
hydrogen gas
Which word equation represents the reaction that produces water from hydrogen and oxygen?
hydrogen plus oxygen yields water
Predict what happens when nickel is added to a solution of potassium chloride
no reaction occurs
Predict what happens when zinc is added to water
no reaction occurs
In one type of synthesis reaction, an element combines with oxygen to yield an
oxide
When a metal chlorate is heated, it decomposes to yield a metal chloride and
oxygen
When a solid produced by a chemical reaction separates fro the solution it is called a
precipitate
Oxides of active metals, such as CaO, 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 reaction represented by the equation Mg(s) + 2HCl(aq) yields H2(g) + MgCl2(aq) is a
single-displacement reaction
When sodium chlorate, NaClO3, decomposes, the products are
sodium chloride and oxygen
The reaction represented by the equation 2Mg(s) + O2(g) is a
synthesis reaction
In a chemical reaction
the mass of the reactants equals the mass of the products
In a double-displacement reaction, hydrogen chloride and sodium hydroxide react to produce sodium chloride. Another product is
water
Magnesium hydroxide decomposes to yield magnesium oxide and
water
Some acids, such as carbonic acid, decompose to nonmetal oxides and
water