Chemical Reactions
Which coefficients correctly balance the formula equation CaO + H2O -> Ca(OH)2
1,1,1
What are the coefficients that will balance the skeleton equation below? AlCl3 + NaOH -> Al(OH)3 + NaCl
1,3,1,3
What are the coefficients that will balance the skeleton equation below ? N2+ H2—>NH3
1,3,2
When potassium hydroxide and barium chloride react, potassium chloride and barium hydroxide are formed the balanced equation for this reaction is
2KOH + BaCl2 --> 2KCl + Ba(OH)2
When the equation Fe3O4 + Al --> Al2O3 + Fe is correctly balanced, what is the coefficient of Fe?
9
The reaction 2HgO(s) —> 2 Hg(I) + O2(g) is a(n)
Decomposition reaction
In writing an equation that produces hydrogen gas, the correct representation of hydrogen gas is
H2
The replacement of bromine by chlorine in a salt is an example of a single - replacement reaction by
Halogens
In a combustion reaction, one of the reactants is
Oxygen
The reaction CI2(g) + 2KBr(aq) —> 2KCI(aq) + Br (I) is a(n)
Single replacement
The reaction Mg(s)+ 2 HCI(aq) —> H2(g)+ MgCI2 (aq) is a
Single replacement
The equation A +BX —> AX + B is the general equation for a ?
Single replacement reaction
Which of the following statements is NOT true about double-replacement reactions ?
The reactant may be a solid metal
What is the name of a list of elements arranged according to the ease with which they undergo certain chemical reactions?
activity series
According to the law of conservation of mass, the total mass of the reacting substances is
always equal to the total mass of the products
In every balanced chemical equation, each side of the equation has the same number of
atoms of each element
In the chemical equation H202 (aq) —> H2O(I) +O2 is a
catalyst / product ?
What is the small whole number that appears in front of a formula in a chemical equation?
coefficient
The equation AX —> A + X is the general equation for a
decomposition reaction
The equation AX + BY -> AY + BX is the general equation for a
double replacement reaction
The reaction Pb(NO3)2(aq) + 2KI(aq) -> PbI2(s) + 2KNO3(aq) is a
double replacement reaction
In a chemical reaction
energy is either absorbed or released
After the correct formula for a reactant in an equation has been written the
formula should not be changed
A solid produced by a chemical reaction in solution that separates from the solution is called
precipitate
The substances listed on the left side of a chemical equation are the
reactants
A chemical equation is balanced when the
same number of each kind of atom appears in the reactants and in the products
The equation A + X -> AX is the general equation for a(n)
synthesis reaction
The reaction 2Mg(s) + O2(g) -> 2MgO(s) is a
synthesis reaction
When the following equation is balanced, what is the coefficient for HCI? Mg(s) + HCI (aq) —> MgCI2(aq)+H2(g)
2
Which coefficients correctly balance the formula NH4NO2 -> N2 + H2O?
2, 2, 2
What are the missing coefficients for the skeleton equation below? Cr(s) + Fe(NO3)2(aq) -> Fe(s) + Cr(NO3)3(aq)
2,3,3,2
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 --> H2O