Essay About H2O And Co2

Chemical Reaction Exam
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Name: _____________________        Class:__________        Date:__________Instructions: Write answers in the right-hand column.        Score: ___________ / 63 marksSection A— Multiple choice (10 marks)Which product in the following chemical reaction is dissolved in solution?CaCO3(s) + 2HCl(aq) → CaCl2(aq) + CO2(g) + H2O(l)A        HClB        CaCl2C        CO2D        H2OB1Which unbalanced formula equation best represents the following word equation?iron(III) oxide + carbon monoxide → iron + carbon dioxide A        Fe2O3 + CO → Fe + CO2B        FeO + CO → Fe + CO2C        Fe2O3 + CO2 → Fe + COD        FeO + CO2 → Fe + COA1Which of the following equations is balanced?A        C2H6 + O2 → CO2 + H2OB        C2H6 + O2 → 2CO2 + 3H2OC        C2H6 + 7O2 → 2CO2 + 3H2OD        2C2H6 + 7O2 → 4CO2 + 6H2OD1Which of the following chemical reactions is a combination reaction?A        2H2O(l) → 2H2(g) + O2(g)B        2H2(g) + O2(g) → 2H2O(l)C        H2O2 → H2 + O2(g)D        H2O + Na → NaOH + H2B1Which is the best term to describe the following reaction?CaCO3(s) → CaO(s) + CO2(g)combination reactionmetal displacement reactionprecipitation reactiondecomposition reactionD1When solutions of sodium chloride (NaCl) and silver nitrate (AgNO3) are mixed, solid silver chloride (AgCl) forms. Which ions remain dissolved in the solution?A        Na+ and Cl−B        Ag+ and Cl−C        Na+ and [pic 1]D        Ag+ and [pic 2]C1Define the process of reduction.A        Reduction is the loss of oxygen or the gain of electrons.B        Reduction is the gain of oxygen or the loss of electrons.C        Reduction is the gain of oxygen or electrons.D        Reduction is the loss of oxygen or electrons.A1What is the main reason limestone is added to a blast furnace?A        to produce the carbon monoxide that reduces the iron or to iron metalB        to react with the carbon in the coke to produce carbon dioxideC        to reduce the iron ore to iron metalD        to react with the silicates in the ore and produce the slag that can be separated from the molten ironD1Explain why crushing solid reactants helps to increase the rate of reaction.A        It exposes more of the solid reactant to the other reactants so there can be more reactions occurring at any one time.B        It weakens the chemical bonds in the solid so that it is easier for the reaction to occur.C        It helps the solid to dissolve.D        All answers are correct.A1Explain why adding a catalyst to a reaction increases the rate of reaction.A        The catalyst can provide a pathway for the chemical reaction that requires less energy.B        The catalyst can help the reactant molecules to come together and react.C        The catalyst can force reactants into the correct arrangement so that they react.D        All answers are correct.D1