1 A limitation of the Arrhenius concept is that it: A Cannot explain the basic nature of ammonia B Cannot explain acids in water C Requires a non-aqueous solvent D Only applies to strong acids
3 In an energy level diagram, the reactants are at a higher energy level than the products. This shows that the reaction is: A Endothermic B Exothermic C Reversible D Catalyzed
4 Which of the following is an example of a physical equilibrium? A Formation of ammonia from nitrogen and hydrogen. B Melting of ice and freezing of water in a closed system. C Combustion of methane. D Rusting of iron.
6 Which reaction produces a salt and water? A Acid + metal B Acid + carbonate C Acid + base D Acid + acid
7 Ammonia (NH3) acts as a base because it: A Donates a proton B Accepts a proton C Donates an electron pair D Accepts an electron pair
9 Which of the following is a closed system? A A system that can exchange both matter and energy with its surroundings B A system that can exchange energy but not matter with its surroundings C A system that cannot exchange either matter or energy with its surroundings D A system that can exchange matter but not energy with its surroundings
10 Ammonia (NH3) acts as a base according to Brønsted-Lowry by: A Accepting a proton B Donating a proton C Donating an electron pair D Accepting an electron pair
11 Which gas is mainly responsible for acid rain? A Carbon dioxide B Sulfur dioxide C Oxygen D Nitrogen
12 In an energy level diagram for an exothermic reaction, the products are at ____ energy than the reactants. A higher B lower C equal D unpredictable
13 In an exothermic reaction, what happens to the enthalpy change (ΔH)? A It is positive because heat is absorbed B It is negative because heat is released C It is zero because no heat is exchanged D It becomes undefined
14 Which statement about bond making is correct? A It absorbs energy B It releases energy C It has no energy change D It only occurs in endothermic reactions
15 For an exothermic reaction, what is the sign of ΔH? A Positive B Negative C Zero D It depends on the reaction
16 For the reaction N2(g) + 3H2(g) ⇌ 2NH3(g), what is the effect of increasing pressure on the equilibrium? A It shifts to the left. B It shifts to the right. C It has no effect. D It changes the equilibrium constant.
17 Which indicator turns red in acidic solution? A Blue litmus B Red litmus C Phenolphthalein D Methyl orange
18 Which of the following is a property of acids? A They taste bitter B They feel soapy C They turn blue litmus red D They release OH⁻ ions in water
19 Which of the following is a control measure to reduce acid rain? A Burning more coal B Using catalytic converters in vehicles C Increasing the use of fossil fuels D Adding more SO2 to the atmosphere
20 What does a double arrow (⇌) in a chemical equation represent? A The reaction is irreversible B The reaction is reversible C The reaction is exothermic D The reaction is endothermic
21 What is the enthalpy change (ΔH) for an exothermic reaction? A Positive B Negative C Zero D Depends on the reaction
22 In a reversible reaction at equilibrium, the concentrations of reactants and products: A Keep changing continuously B Become zero C Remain constant D Become equal to each other
23 Which reaction occurs when an acid reacts with a metal carbonate? A Only salt and water are formed. B Salt, water and carbon dioxide are formed. C Only hydrogen gas is produced. D No reaction takes place.
24 During anaerobic respiration in muscles, which substance builds up and causes fatigue? A Ethanol B Carbon dioxide C Lactic acid D Glucose
25 Which of the following changes will NOT shift the position of equilibrium? A Adding a catalyst B Changing temperature C Changing pressure D Changing concentration