DE_Chem_4.4_Electrochemistry
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Last updated over 2 years ago
22 questions
Note from the author:
Target: Take what you know about conservation (of atoms) and chemical properties of elements to describe and predict chemical equations
Target: Take what you know about conservation (of atoms) and chemical properties of elements to describe and predict chemical equations
Engage
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Essential Question:What are electrolytic and voltaic cells, and what are their similarities and differences?What I Know...(type your answer in blue)
Essential Question:
What are electrolytic and voltaic cells, and what are their similarities and differences?
What I Know...(type your answer in blue)
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Watch the engage video: Electrolysis Reveals Water Is Not ElementalHow did early chemists discover water was not elemental?
Watch the engage video: Electrolysis Reveals Water Is Not Elemental
How did early chemists discover water was not elemental?
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Electrolysis of water (2H2O→2H2+ O2) is a _______ reaction (think of the different type of reactions we have studied)
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According to the video "Fuel Cell" how does a fuel cell work?
According to the video "Fuel Cell" how does a fuel cell work?
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According to the video "Fuel Cell" people are concerned about the safety of compressed hydrogen because it can explode (combustion reaction). Researchers have found a new way to soak up hydrogen like a sponge, so you don't have to compress it. What is the new material that can safely store hydrogen and avoid the risk of explosion?
According to the video "Fuel Cell" people are concerned about the safety of compressed hydrogen because it can explode (combustion reaction). Researchers have found a new way to soak up hydrogen like a sponge, so you don't have to compress it. What is the new material that can safely store hydrogen and avoid the risk of explosion?
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According to the video "Chemicals and Electricity", what element did Humphry Davy isolate by running electricity through melted potash?
According to the video "Chemicals and Electricity", what element did Humphry Davy isolate by running electricity through melted potash?
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- Li -> Li+ + 1e-
- Fe2+ + 2e- -> Fe
- Al -> Al3+ + 3e-
- Cu2+ + e- -> Cu+
- Mg2+ + 2e- -> Mg
- oxidation reaction
- reduction reaction
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Which of the following describe the following electrochemical cell? (Hint: Anode is the electrode where oxidation reaction takes place, and in the cathode, reduction takes place) (Hint#2: Anode is the electrode where electricity moves into the external circuit, and cathode is the electrode where electricity is given out)
Which of the following describe the following electrochemical cell? (Hint: Anode is the electrode where oxidation reaction takes place, and in the cathode, reduction takes place) (Hint#2: Anode is the electrode where electricity moves into the external circuit, and cathode is the electrode where electricity is given out)
Explore 1
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In an electrochemical cell, _______ must be present. Oxidation occurs (electrons are released) at a location referred to as the _______ . Reduction occurs (electrons are gained) at a location referred to as a _______ . The anode and cathode must be _______ so that electrons and ions can _______ between them.
_______ move through wires from one electrode to the other. Then _______ take over and move through the solution to complete the circuit
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In a voltaic cell, the anode is __________ and the cathode is __________. However, in an electrolytic cell, the anode is __________ and the cathode is __________.
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This image is an example of a(n) _______ cell.
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This is an example of a(n) _______ cell.
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There are two types of electrochemical cells. Voltaic cells use chemical reactions to _______ electricity, and electrolytic cells use electricity to _______ chemical energy
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What do they mean by 'an otherwise non-spontaneous chemical reaction'?
What do they mean by 'an otherwise non-spontaneous chemical reaction'?
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What external path are the electrons flowing through in this voltaic cell?
What external path are the electrons flowing through in this voltaic cell?
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In electrolytic cells, _______ energy is converted to _______
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In voltaic cells, _______ energy is converted to _______ energy.
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Electrons have potential energy. This potential energy varies depending on an electron’s _______ in a circuit. Potential energy also depends on the reaction taking place at each electrode. Cell potential is the _______ in electric potential energy between the two electrodes in a cell. This quantity is measured in _______ (V).
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Standard reduction potential (E°), in units of volts, measures a substance’s ability to gain electrons at standard conditions of temperature and pressure. The standard reduction potential is also called the _______ because it can be used to describe all of the reactions that occur in a cell. The standard electrode potential of an oxidation half-reaction is _______ to the standard electrode potential of the reduction reaction.
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In a voltaic cell, electrons are transferred through an external pathway (wire), from the anode to the cathode. Ions then are transferred through an _______ pathway.
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What does it mean when they say that oxidation-reduction reactions in voltaic cells are spontaneous?
What does it mean when they say that oxidation-reduction reactions in voltaic cells are spontaneous?
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An electrolytic cell involves a non-spontaneous oxidation-reduction reaction. Energy must be _______ for this reaction to proceed. An electrolytic cell uses _______ energy, often in the form of a battery, to break down compounds and _______ chemical energy in a process called _______.