Solid potassium chlorate (KClO3) dissolves into water to form potassium (K+) and chlorate (ClO3-) ions according to the following balanced equation: KClO3(s) arrow K+(aq) + ClO3-(aq); Delta Hrxn = +41.3 kJ/mol True or false? The reaction releases energy t (2024)

Get access to this video and our entire Q&A library

• Solid potassium chlorate (KClO3) dissolves into water to form potassium (K+) and chlorate (ClO3-) ions according to the following balanced equation: KClO3(s) arrow K+(aq) + ClO3-(aq); Delta Hrxn = +41.3 kJ/mol True or false? If 1.2 moles of KClO3 dissolve
• Solid potassium chlorate (KClO3) dissolves into water to form potassium (K+) and chlorate (ClO3-) ions according to the following balanced equation: KClO3(s) arrow K+(aq) + ClO3-(aq); Delta Hrxn = +41.3 kJ/mol True or false? The standard enthalpy of forma
• The symbol Delta, above or below the reaction arrow in an equation, indicates that heating is needed for the reaction to take place. (a) True (b) False
• 0.5 mol of oxygen gas can react with hydrogen gas to form 1.0 mol of water. A. True B. False
• Consider the reaction represented by the chemical equation C(s)+O_2(g)\rightarrow CO_2(g) Since the coefficients of the balanced chemical equation are all equal to 1, we know that exactly 1 g of C will react with exactly 1 g of O_2 True or false? Explain.
• True or false? When K2O reacts with HCl, the products are KCl and H2O.
• True or false? Given the balanced chemical reaction C5H12 + 8O2 arrow 5CO2 + 6H2O, the number of moles of water molecules that can be formed when 12 moles of O2 are reacted is 9.
• Given the balanced chemical reaction C5H12 + 8O2 arrow 5CO2 + 6H2O, the number of moles of water molecules that can be formed when 12 moles of O2 are reacted is 9. Is this statement true or false? Explain.
• Given the reaction, N_{2} + 2 O_{2} \rightarrow 2 NO_{2},14 g of nitrogen gas will yield approximately 46 g of nitrogen dioxide. a. True b. False
• The actual yield is the amount of product expected from a given amount of reactant based on the coefficients in the balanced chemical equation. a. True. b. False.
• True or False: The balanced reaction: 4 Fe(s) + 3 O2(g) arrow 2 Fe2O3(s) is an oxidation-reduction reaction.
• Pulverizing a solid reactant from chunks into a powder can affect the rate of the chemical reaction. a. TRUE b. FALSE
• Given the chemical equation: 2 Ca + O2 is less than 2 CaO, if 2 moles of CaO are formed in this reaction, then 2 moles of O2 must have reacted. True False
• Given the chemical equation: 2 Ca + O_2 to 2 CaO. If 2 moles of CaO are formed in this reaction, then 2 moles of O_2 must have reacted. State whether the statement is True or False.
• Suppose 50 grams of CH4 and 120 grams of O2 react with each other. The reactant O2 is in excess here. Is this statement true or false? Explain. CH4 + 2O2 arrow CO2 + 2H2O
• True or false? In a chemical reaction, at least one reactant must be in excess for the reaction to be completed.
• True or false? For the reaction represented by the balanced chemical equation for 0.40 mole of Mg(OH)2, 0.20 mol of HCl will be needed.
• True or false? If any of the reactants or products in a reaction contain oxygen, then the reaction is a redox reaction.
• True or false? The reaction 4Fe(s) + 3O2(g) arrow 2Fe2O3(s) is a decomposition reaction.
• Answer true or false: Potassium hydroxide contains oxygen, helium, and potassium.
• A balanced chemical equation must account for every atom involved in a chemical reaction. a. TRUE b. FALSE
• AgCl is more soluble in 1 M KNO_3 than H_2O. a. True. b. False.
• Solid ammonium nitrate (NH4NO3) reacts, over time, to form nitrogen, oxygen and water gases. This is a synthesis reaction. A. True B. False
• In the reaction of hydrogen gas with oxygen gas to produce water, 1.00 mol of oxygen and 1.00 mol of hydrogen can produce 2.00 mol of water. \\ A. True B. False
• A combination reaction may also be a displacement reaction. State true or false.
• A solid KCl is more soluble in water than in methanol (CH3OH). True or false?
• Burning C_4H_10 in oxygen gas is an example of a combination reaction. True False
• If a reactant is in the solid-state, a (g) is placed as a subscript after the chemical formula. a. TRUE b. FALSE
• True or false? In an exothermic chemical reaction, energy is released as the reaction proceeds.
• True or false? If the following reaction mixture initially contains only OF2(g), then at equilibrium, the reaction mixture will consist of essentially only O2(g) and F2(g). O2(g) + 2F2(g) arrow 2OF2(g); Kp = 2.3 x 10-15
• True or false? A precipitate is an insoluble product formed in a reaction.
• True or false? The limiting reactant in a reaction has the lowest coefficient in a balanced equation.
• True or false? If the heat of reaction (Delta H) is positive, the energy of the products is lower than the energy of the reactants, and the reaction is exothermic.
• True or false? If a reactant is in the solid state, a (g) is placed as a subscript after the chemical formula.
• True or false? Delta S for the following reaction is positive: CaCO3(s) arrow CaO(s) + CO2(g)
• The theoretical yield for a chemical reaction can not be calculated until the reaction is completed. a. TRUE b. FALSE
• True or false? The K+ ion is formed when a potassium atom loses one electron.
• True or false? Coefficients can be fractions when balancing a chemical equation. Whether true or false, explain why this can or cannot occur.
• True or false? Theoretical yield is the yield of a product that should be obtained according to the balanced chemical equation.
• TRUE OR FALSE: If 1.2 moles of C3H5N3O9 decompose, the energy change of the reaction (qrxn) is -5,678 kJ.
• In a neutralization reaction, the products formed are generally salt and water. 1) True. 2) False.
• A neutralization reaction is a double-displacement reaction. True False
• Which of the following statements about chemical reactions is false? When balancing a chemical equation, all subscripts must be conserved.; When one coefficient is doubled, the rest of the coefficients in the balanced equation must also be doubled.
• Delta S for the following reaction is positive. True or false? 2 CO(g) + O2(g) leads to 2 CO2(g)
• The K+ ion is formed when a potassium atom loses one electron. Is this statement true or false? Explain.
• True or false? The name of KNO3 is potassium nitratide.
• True or false? Solvolysis is the reaction of a substance with the solvent in which it is dissolved.
• When 7.5 x 10^-8 g of KOH is dissolved in 1.00 L of 1.0 x 10^-3 M Cu(NO3)2, a precipitate of Cu(OH)2 is formed. True or False?
• For the equation H2(g) + Cl2(g) arrow 2HCl(g), which statement is false? a. 2 molecules of HCl are formed b. 1 mole of Cl2(g) is a reactant c. the sum of the coefficients of the reactants is 2 d. 4 grams of H2(g) reacts with 1 mole of Cl2(g)
• True or false? A reaction is exothermic if the products have lower energy than the reactants.
• True or false? When a reaction is at equilibrium, it occurs very quickly and uses up all of the reactants.
• Chemical reactions that release energy possess reactants with lower energy than their products. a) True. b) False.
• In determining the equilibrium constant for a reaction, reactants or products in solid or aqueous form are not included in the expression. True False
• True or false? Delta G depends upon the concentration of the reactants and products.
• True or false? Delta G is negative for endergonic reactions.
• True or false? When Delta G = 0, which of the following is true? a. The reaction can spontaneously proceed in the forward direction. b. The reaction can spontaneously proceed from products to reactants. c. The reaction requires no heat to proceed. d. Neit
• In chemical reactions sometimes the elements that start the reaction disappear and some new elements are created. True or False?
• True or false? Electrolytic reactions and voltaic reactions are both spontaneous reactions.
• Every chemical reaction is a redox reaction. (a) True (b) False
• The neutralization reaction is an exothermic reaction. Is the statement true or false?
• True or false? The reaction HA arrow H+ + A- shows complete dissociation in any amount.
• Given the equation 3A + B \rightarrow C + D, you react 1 mole of A with 3 moles of B. True or false: A is the limiting reactant because you have fewer moles of A than B. True False
• Consider the following equilibrium. 4NH3(g) + 3O2(g) arrow 2N2(g) + 6H2O(g) + 1531 kJ The concentrations of the reactants would increase after nitrogen gas was removed from the system. Is this statement true or false? Explain.
• True or false? The rate expression for a chemical reaction can be determined from its chemical equation.
• True or false? When the yield of a chemical reaction is less than 100%, this indicates one of the reactants is present in an insufficient amount to react with the entire amount of another reactant.
• In every chemical reaction the number of moles of reactant must equal the number of moles of product. True or False?
• True or false? When balancing a chemical equation, it may be useful and acceptable to change subscripts, add coefficients, or add diatomic molecules to the equation.
• True or false? There are 520 grams of KCl in 250 mL of a 0.028 M solution of KCl.
• True or false? For the reaction (at constant pressure) 2N2(g) + 5O2(g) arrow 2N2O5(g), the change in enthalpy is the same whether the reaction takes place in one step or in a series of steps.
• True or false? Spontaneous chemical reactions are always accompanied by a decrease in the enthalpy of the system.
• True or false? The reaction HCl(aq) + Na2CO3(aq) arrow NaCl(aq) + H2O(l) + CO2(g) involves changes in oxidation numbers and is therefore classified as a redox reaction.
• True or false? In an endothermic reaction, the enthalpy of the reactants is higher than the enthalpy of the products.
• The limiting reactant in a chemical reaction is the reactant which is completely consumed first. True or False?
• True or false? The ionization equation for water is H2O + H2O arrow H3O+ + OH-.
• True or false? The dissolution of a gas in water is usually an exothermic process.
• Given the reaction, N2 + 2O2 \rightarrow 2NO2, 14 grams of nitrogen gas will yield approximately 46 grams of nitrogen dioxide. True False
• The percent yield for a chemical reaction cannot be calculated until the reaction is completed. a. TRUE b. FALSE
• Select True or False. In the reaction, 2N_2O to 2N_2 + O_2, oxygen and nitrogen gases are formed at the same rate (mol/ L . s). A) True. B) False.
• True or false? A net ionic equation shows all the ions present in a solution when a chemical reaction occurs.
• A reaction will only be spontaneous if the change in enthalpy is more negative than the product of -T\DeltaS is positive. True False
• True or false? Energy released in exothermic reactions is proportional to mass loss from reactants to products.
• True or false? The element Ar reacts vigorously with alkali metals to form salts.
• In chemical equations, as long as all of the coefficients are the same on both sides of the equation, the equation is balanced. a. TRUE b. FALSE
• Activation energy is used to determine if a chemical reaction is endothermic or exothermic. True or False.
• True or false? Stoichiometry is best defined as the qualitative relationship between reactants and products in a chemical reaction.
• The density of a solid reactant affects the rate of a reaction. True False
• True or false? In an endothermic reaction, the products are less stable than the reactants.
• True or false? Precipitation reactions between ionic compounds occur faster when the compounds are dissolved in water than when the solids are not in solution.
• When balancing a chemical equation, it is acceptable to change the subscripts on the formulas of the skeletal equation. True False
• The ''pop'' bottle demonstration requires that hydrogen and oxygen gas mixture be ignited by a flame. \\ True or False: \\ This means that the reaction of hydrogen gas and oxygen gas to form water is endothermic.
• The equation, D + F + heat --> DF, is an example of an endothermic reaction.a. TRUEb. FALSE
• True or false? The dissociation equation for MgCl2 in water is MgCl2 arrow Mg2+ + 2Cl-.
• True or false? The size of the Delta H between reactants and products will change dramatically as the temperature changes in an endothermic reaction.
• True or false? When a reaction is at equilibrium, it produces the same amount of product as reactant.
• True or False: In an endothermic reaction, heat energy must be added to the reactants to allow the reaction to occur.
• Consider the following reaction. N2(g) + 3H2(g) arrow 2NH3(g) When nitrogen is added to the system at equilibrium, the reaction will shift toward the products. Is this statement true or false? Explain.
• In determining the equilibrium constant for a reaction, only gases and aqueous solutions are included in the expression. TRUE or FALSE?
• All chemical reactions can establish dynamic equilibrium. Is the statement true or false?
• When a chemical reaction has reached equilibrium, the concentrations of reactants and products are equal. a. True. b. False.
• Answer true or false: The following reaction is balanced: BaCl2 + H2SO4 to 2HCl + BaSO4