Gr 9 NATURAL SCIENCES: CH 3.2 SUM Electric cells
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Questions and Answers

What is the primary function of an electric cell?

  • To convert chemical energy into electrical energy (correct)
  • To generate mechanical energy
  • To store electrical energy
  • To convert electrical energy into chemical energy

What is a battery?

  • A group of two or more electric cells connected together (correct)
  • A device that converts mechanical energy into electrical energy
  • A single electric cell
  • A type of electrolyte

What is the purpose of an electrode in an electric cell?

  • To store chemical energy
  • To allow electricity to enter or leave a medium (correct)
  • To produce a salt bridge
  • To generate electrical energy

What is the primary difference between electric cells and mechanical generators?

<p>Electric cells do not have moving parts (B)</p> Signup and view all the answers

What is the purpose of the lemon in the simple lemon battery experiment?

<p>To facilitate a chemical reaction (C)</p> Signup and view all the answers

What is a half cell?

<p>One part of a two-part electrochemical cell (B)</p> Signup and view all the answers

What is the purpose of the zinc nail in the simple lemon battery experiment?

<p>To act as an electrode (C)</p> Signup and view all the answers

What is the system in an electric cell?

<p>The chemical components and reactions (D)</p> Signup and view all the answers

What is the purpose of the copper nail in the simple lemon battery experiment?

<p>To act as an electrode (B)</p> Signup and view all the answers

What is the result of the chemical reaction in an electric cell?

<p>Electrical energy (C)</p> Signup and view all the answers

What is the purpose of the U-tube filled with salt solution in the zinc-copper cell?

<p>To act as a salt bridge, allowing the flow of ions between the two solutions (D)</p> Signup and view all the answers

What happens to the zinc metal at the anode in the zinc-copper cell?

<p>It loses electrons and becomes zinc ions (C)</p> Signup and view all the answers

What is the function of the lemon juice in the setup with the copper and zinc nails?

<p>It acts as an electrolyte, facilitating the flow of electrons (C)</p> Signup and view all the answers

What is the purpose of the ammeter or voltmeter in the zinc-copper cell?

<p>To measure the electric current or voltage (D)</p> Signup and view all the answers

What happens to the copper ions at the cathode in the zinc-copper cell?

<p>They gain electrons and become copper metal (B)</p> Signup and view all the answers

What is the role of the copper plate in the zinc-copper cell?

<p>It acts as a cathode (C)</p> Signup and view all the answers

What is the purpose of the zinc plate in the zinc-copper cell?

<p>It acts as an anode (D)</p> Signup and view all the answers

What is the result of the chemical reactions occurring at the electrodes in the zinc-copper cell?

<p>The flow of electrons through the external circuit (C)</p> Signup and view all the answers

What is the purpose of the LED light in the zinc-copper cell?

<p>To indicate the occurrence of a chemical reaction (D)</p> Signup and view all the answers

What is the function of the zinc sulfate solution in the zinc-copper cell?

<p>It acts as an electrolyte (D)</p> Signup and view all the answers

What type of energy is converted into electrical energy in an electric cell?

<p>Chemical energy (D)</p> Signup and view all the answers

What is the term for a device used to connect the oxidation and reduction half-cells of a voltaic cell?

<p>Salt bridge (C)</p> Signup and view all the answers

What is the purpose of the zinc and copper nails in the simple lemon battery experiment?

<p>To facilitate chemical reactions (C)</p> Signup and view all the answers

What is the characteristic of electric cells that distinguishes them from mechanical generators?

<p>Chemical reactions (C)</p> Signup and view all the answers

What is the term for a substance that produces an electrically conducting solution when dissolved?

<p>Electrolyte (D)</p> Signup and view all the answers

What is the overall function of the system in an electric cell?

<p>To generate electrical energy (B)</p> Signup and view all the answers

What is the term for a conductor through which electricity enters or leaves a medium?

<p>Electrode (B)</p> Signup and view all the answers

What is the purpose of connecting the copper nail to the LED light in the simple lemon battery experiment?

<p>To complete the circuit (D)</p> Signup and view all the answers

What is the characteristic of electric cells that allows them to power electric circuits?

<p>They convert chemical energy into electrical energy (C)</p> Signup and view all the answers

What is the term for a group of two or more electric cells connected together?

<p>Battery (D)</p> Signup and view all the answers

What is the primary function of the copper sulfate solution in the zinc-copper cell?

<p>To provide copper ions for the reaction (A)</p> Signup and view all the answers

What is the purpose of completing the external circuit in the zinc-copper cell?

<p>To facilitate the flow of electrons (B)</p> Signup and view all the answers

What happens to the electrons at the anode in the zinc-copper cell?

<p>They are lost by the zinc metal (D)</p> Signup and view all the answers

What is the purpose of the salt bridge in the zinc-copper cell?

<p>To allow the flow of ions between the solutions (C)</p> Signup and view all the answers

What is the direction of electron flow in the zinc-copper cell?

<p>From the zinc electrode to the copper electrode (C)</p> Signup and view all the answers

What is the role of the zinc sulfate solution in the zinc-copper cell?

<p>To facilitate the flow of ions (B)</p> Signup and view all the answers

What is the net result of the chemical reactions occurring at the electrodes in the zinc-copper cell?

<p>Flow of electrons (B)</p> Signup and view all the answers

What is the purpose of connecting the zinc plate to the negative terminal of the ammeter or voltmeter?

<p>To measure the voltage of the cell (B)</p> Signup and view all the answers

What is the function of the copper plate in the zinc-copper cell?

<p>To provide a site for copper ions to deposit (A)</p> Signup and view all the answers

What is the primary difference between the zinc-copper cell and the simple lemon battery?

<p>The materials used for the electrodes (D)</p> Signup and view all the answers

What is the primary function of the acid in the lemon juice in the simple lemon battery experiment?

<p>To facilitate the flow of electrons between the electrodes (D)</p> Signup and view all the answers

What is the role of the zinc sulfate solution in the zinc-copper cell?

<p>To act as an electrolyte and facilitate the flow of electrons (B)</p> Signup and view all the answers

What is the purpose of the salt bridge in the zinc-copper cell?

<p>To connect the two half-cells and complete the circuit (A)</p> Signup and view all the answers

What type of reaction occurs at the zinc electrode (anode) in the zinc-copper cell?

<p>Oxidation reaction (B)</p> Signup and view all the answers

What is the direction of electron flow in the zinc-copper cell?

<p>From the zinc electrode to the copper electrode (B)</p> Signup and view all the answers

What is the purpose of connecting the copper plate to the positive terminal of the ammeter or voltmeter?

<p>To measure the voltage generated by the cell (C)</p> Signup and view all the answers

What is the net result of the chemical reactions occurring at the electrodes in the zinc-copper cell?

<p>The generation of electrical energy (B)</p> Signup and view all the answers

What is the primary function of the U-tube filled with salt solution in the zinc-copper cell?

<p>To connect the two half-cells and complete the circuit (B)</p> Signup and view all the answers

What occurs at the copper electrode (cathode) in the zinc-copper cell?

<p>Copper ions from the solution gain electrons and deposit as copper metal on the electrode (C)</p> Signup and view all the answers

What is the purpose of completing the external circuit in the zinc-copper cell?

<p>To allow the flow of electrons and generate electric current (C)</p> Signup and view all the answers

Which component of an electric cell is responsible for generating electricity through chemical reactions?

<p>Chemical components (B)</p> Signup and view all the answers

What is the primary function of the copper nail in the simple lemon battery experiment?

<p>To act as an electrode (C)</p> Signup and view all the answers

Which of the following is a characteristic of electric cells that distinguishes them from mechanical generators?

<p>Use of chemical reactions (A)</p> Signup and view all the answers

What is the term for the process of generating electricity through chemical reactions within an electric cell?

<p>Electrochemical reaction (A)</p> Signup and view all the answers

Which of the following is a requirement for an electric cell to function?

<p>Connection of the electrodes to a medium (A)</p> Signup and view all the answers

What is the primary function of the electrolyte in an electric cell?

<p>To produce an electrically conducting solution (B)</p> Signup and view all the answers

Which of the following is a characteristic of electric cells that allows them to power electric circuits?

<p>Ability to generate electricity (B)</p> Signup and view all the answers

What is the primary function of the zinc nail in the simple lemon battery experiment?

<p>To act as an electrode (D)</p> Signup and view all the answers

Which of the following is NOT a characteristic of electric cells?

<p>Presence of moving parts (D)</p> Signup and view all the answers

What is the primary function of the system in an electric cell?

<p>To achieve a specific function (B)</p> Signup and view all the answers

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