The combustion of hydrocarbon fuels is a) endothermic. b) exothermic. c) isother
ID: 530965 • Letter: T
Question
The combustion of hydrocarbon fuels is a) endothermic. b) exothermic. c) isothermic d) protothermic. The products of the complete combustion of the hydrocarbon methane are a) carbon monoxide and water. b) carbon monoxide and hydrogen, c) carbon dioxide and water. d) carbon dioxide and hydrogen. Which of the following reactions is exothermic? a) 2H_2O_2 rightarrow H_2O + O_2 b) NaOH + HC1 rightarrow NaCl + H_2O c) CaCO_3 rightarrow CaO + CO_2 d) 2KCIO_3 rightarrow 2KCI + 3O_2 When the equation NH_4OH + H_2SO_4 rightarrow (NH_4)_2SO_4 + H_2O is balanced, a term in the balanced equation is a) 2H_2SO_4 b) NH_4OH c) 2(NH_4)_2SO_4 d) 2H_2O When 2.0 mol of H_2 react with 1.0 mol of O_2 to produce 2.0 mol of H_2O. how many grams of H_2O are produced? a)18.0 g b) 2.0 g c) 32 g d)1.0g The amount of energy that must be supplied to start a chemical reaction is called the a) heat of reaction, b) heat of fusion. c) heat of vaporization. d) activation energy. The formula of copper(II) sulfate is Cu_2S. a) True b) False A mole ratio is used to convert the given number of moles of one substance to the unknown number of moles of a second substance. a) true b) falseExplanation / Answer
(7) (b) Exothermic. All combustion reactions can releases energy.
(8) (c) carbondioxide and water. Complete combustion of any hydrocarbon produces CO2 and H2O.
(9) (b) A neutralisation of strong acid and strong base is an exothermic reaction.
Remaining are decomposition reactions which require enrgy. they are endothermic.
(10) 2 NH4OH + H2SO4 -----------> (NH4)2SO4 + 2 H2O
(d) 2 H2O
(11) mass = Moles * molar mass = 2.0 * 18 = 36.0
(12) (d) Activation energy.
(13) (b) False. CuSO4 is correct.
(14) (a) TRUE