1 Which of the following is an application of electrochemistry? A Distillation B Electrolysis C Filtration D Evaporation
2 Which method prevents corrosion by coating iron with zinc? A Electroplating B Painting C Galvanization D Alloying
4 Which of the following is NOT a method to prevent corrosion? A Painting B Galvanization C Electroplating D Rusting
5 Nadia is studying the formula of ionic compounds. She knows that the formula must be neutral. What is the formula of the ionic compound formed between magnesium (Mg2+) and chloride (Cl-)? A MgCl B MgCl2 C Mg2Cl D MgCl3
6 Reduction is defined as: A Loss of electrons B Gain of electrons C Loss of oxygen D Gain of protons
9 Xia is learning about oxidizing agents. She understands that an oxidizing agent is itself reduced. In the reaction: 2FeCl2 + Cl2 → 2FeCl3, which is the oxidizing agent? A FeCl2 B Cl2 C FeCl3 D Both A and B
10 The electrolyte in an electrochemical cell is: A A metal B A conductor of electrons C A solution that conducts ions D An insulator
11 Chloe is studying redox reactions in terms of transfer of hydrogen. She learns that oxidation involves loss of hydrogen while reduction involves gain of hydrogen. In the reaction: H2S + Cl2 → 2HCl + S, which substance is oxidized? A H2S B Cl2 C HCl D S
13 Which substance is necessary for rusting of iron? A Nitrogen B Carbon dioxide C Water and oxygen D Hydrogen
14 Emma is learning about redox reactions in photography. She discovers that silver bromide (AgBr) is used in photographic films. In the photographic process, AgBr is reduced to Ag. What happens to AgBr in this process? A It is oxidized B It is reduced C It undergoes both oxidation and reduction D It does not react
15 David is studying redox reactions in terms of transfer of oxygen. He learns that oxidation involves gain of oxygen while reduction involves loss of oxygen. In the reaction: 2Mg + O2 → 2MgO, which substance is reduced? A Mg B O2 C MgO D Both A and B
16 Oxidation is the process of: A Gain of electrons B Loss of electrons C Gain of neutrons D Loss of protons
17 Which material is commonly used as electrolyte in electroplating? A Distilled water B Molten metal C Salt solution of plating metal D Pure acid
18 A reducing agent is a substance that: A Gains electrons B Loses electrons C Accepts oxygen D Stops reduction
19 Tina is studying oxidation states of monoatomic ions. She knows that the oxidation state is equal to the ion's charge. What is the oxidation state of Al3+? A +1 B +2 C +3 D -3
20 Vera is studying oxidation states. She learns that the oxidation state of fluorine is always -1 in all its compounds. What is the oxidation state of fluorine in F2? A 0 B -1 C +1 D -2
21 Ibrahim is learning about oxidation states of polyatomic ions. He understands that the sum of oxidation states equals the ion's charge. In the carbonate ion (CO3^2-), what is the oxidation state of carbon if oxygen is -2? A +2 B +4 C -4 D +6
22 Which statement best describes a redox reaction? A Only oxidation occurs B Only reduction occurs C Oxidation and reduction occur together D No electron transfer occurs
24 Paula is studying galvanizing. She learns that galvanizing is the process of coating iron or steel with zinc. Why is zinc used in galvanizing? A Because zinc is a good conductor of electricity B Because zinc is more reactive than iron and acts as a sacrificial anode C Because zinc is less reactive than iron D Because zinc is a noble metal
25 An oxidizing agent is a substance that: A Loses electrons B Gains electrons C Gives electrons to others D Prevents oxidation
26 George is studying oxidation states of monoatomic ions. He knows that a monoatomic ion's oxidation state is its charge. What is the oxidation state of Ca2+? A +1 B +2 C -2 D 0
27 Bilal is learning about reduction in terms of gain of electrons. He understands that reduction involves the gain of electrons. Which of the following represents reduction? A Zn → Zn2+ + 2e- B Cu2+ + 2e- → Cu C Mg → Mg2+ + 2e- D Al → Al3+ + 3e-
28 Ahmed is studying oxidation and reduction in his chemistry class. His teacher explains that oxidation is the loss of electrons. Based on this definition, which of the following processes represents oxidation? A Na → Na+ + e- B Cl2 + 2e- → 2Cl- C Fe2+ → Fe3+ + e- D Both A and C
29 Ethan is studying cathodic protection. He learns that this method is often used to protect underground pipelines. What is the principle behind cathodic protection? A The protected metal is made the anode B The protected metal is made the cathode and a more reactive metal acts as a sacrificial anode C The protected metal is coated with paint D The protected metal is alloyed with chromium