07 Chapter Chemical Reaction (TRO), HW

NOT Evidence of a Chemical Reaction

-We can be fooled. -When water boils, bubbles form and a gas is evolved, but no chemical reaction has occurred. -Boiling water forms gaseous steam, but both water and steam are composed of water molecules—no chemical change has occurred.

Gaseous acetylene (C2H2) reacts with oxygen gas to form gaseous carbon dioxide and gaseous water.

2C2H2(g)+5O2(g)→4CO2(g)+2H2O(g)

Gaseous carbon monoxide reacts with oxygen gas to form carbon dioxide gas.

2CO(g)+O2(g)→2CO2(g)

Gaseous ammonia (NH3) reacts with gaseous oxygen to form gaseous nitrogen monoxide and gaseous water.

4NH3(g)+5O2(g)→4NO(g)+6H2O(g)

Evidence of a Chemical Reaction

A color change • The formation of a solid in a previously clear (unclouded) solution • The formation of a gas when you add a substance to a solution • The emission of light • The emission or absorption of heat

Soluble or Insoluble

BaSO4 - Barium Sulfate - insoluble NaNO3 - Sodium Nitrate - soluble KCl- Potassium Chloride - soluble KBr- Potassium Bromide - soluble Cu(NO3)2 - Copper Nitrate - soluble Cu(OH)2 - Copper Hydroxide - insoluble Hg2I2 - Mercury Iodide - insoluble NaCl - Sodium Chloride - soluble AlCl - Aluminium Chloride - soluble

Human cells obtain energy from a reaction called cellular respiration. Balance the skeletal equation for cellular respiration. C6H12O6(aq)+O2(g)→CO2(g)+H2O(l)

C6H12O6(aq)+6O2(g)→6CO2(g)+6H2O(l)

Gaseous carbon monoxide reacts with hydrogen gas to form gaseous methane (CH4) and liquid water

CO(g)+3H2(g)→CH4(g)+H2O(l)

Chlorine gas reacts with aqueous potassium iodide to form solid iodine and aqueous potassium chloride.

Cl2(g)+2KI(aq)→I2(s)+2KCl(aq)

Solid iron(III) oxide reacts with hydrogen gas to form solid iron and liquid water.

Fe2O3(s)+3H2(g)→2Fe(s)+3H2O(l)

Determine whether each of the following compounds is soluble.

K3PO4 Pb(NO3)2 CuI2 Na2CO3 LiOH

Solid lithium oxide reacts with liquid water to form aqueous lithium hydroxide.

Li2O(s)+H2O(l)→2LiOH(aq)

Determine whether each of the following compounds is insoluble.

PbI2 Hg2Br2 PbBr2 SrSO4 Cu(OH)2

Solid lead(II) sulfide reacts with aqueous hydrochloric acid to form solid lead(II) chloride and dihydrogen sulfide gas.

PbS(s)+2HCl(aq)→PbCl2(s)+H2S(g)

Classify each substance as either a reactant or product in the chemical reaction Ethanol Oxygen Water Carbon DIoxide

Reactant: Ethanol Oxygen Products: Water Carbon DIoxide

Chemical Equations

The substances on the left side of the equation are the reactants, and the substances on the right side are the products.

A compound is soluble in a particular liquid

if it dissolves in that liquid

A compound is insoluble

if it does not dissolve in the liquid.

An aqueous solution

is a homogeneous mixture of a substance with water