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