1.

Which metal is the most easily oxidized?
A.) highly active metal
*B.) moderately active metal
C.) slightly active metal
D.) an inactive metal

2.
What happens in a voltaic cell?

*A.) Chemical energy is changed to a electrical energy.
B.) Electrical energy is changed to chemical energy.
C.) Electrical energy is changed to magnetic energy.
D.) Magnetic energy is changed to electrical energy.

3.
In a dry cell, the electrolyte is a ____.

A.) solid
*B.) paste
C.) liquid
D.) gas

4.
What elecrolyte is used in a lead storage battery?

A.) hydrochloric acid
*B.) sulfuric acid
C.) lead acetate
D.) lead nitrate

5.
Which of the following is true about fuel cells?

A.) They only produce energy in short bursts.
B.) They are inexpensive.
C.) They have never been built or used.
*D.) They can be designed so that they emit no pollutants.

Thank You.

I answered this question for you below.

1. To determine the most easily oxidized metal, you can refer to the reactivity series of metals. This series arranges metals in order of their reactivity, with the most reactive metal being at the top. The higher a metal is on the reactivity series, the more easily it oxidizes.

Highly active metals such as sodium and potassium are at the top of the reactivity series, meaning they are the most easily oxidized. Moderately active metals like zinc and iron are in the middle, while slightly active metals and inactive metals are towards the bottom.

Therefore, the correct answer is B.) moderately active metal.

2. In a voltaic cell, chemical energy is converted into electrical energy. The conversion of energy is facilitated through a redox (reduction-oxidation) reaction.

A voltaic cell consists of two half-cells: an oxidation half-cell and a reduction half-cell. In the oxidation half-cell, oxidation takes place, which involves the loss of electrons from a substance. In the reduction half-cell, reduction takes place, which involves the gain of electrons by another substance.

The electrons lost during oxidation flow through an external circuit to the reduction half-cell, creating an electric current. The chemical reactions in the half-cells involve the transfer of electrons and ions, resulting in the conversion of chemical energy into electrical energy.

Therefore, the correct answer is A.) Chemical energy is changed to electrical energy.

3. In a dry cell, the electrolyte is in the form of a paste. A dry cell is a common type of battery used in portable electronic devices, such as torchlights or radios.

The paste electrolyte in a dry cell is typically a mixture of chemicals, such as ammonium chloride and zinc chloride, contained within a zinc casing. This paste-like electrolyte allows for ion conductivity and facilitates the chemical reactions necessary for the cell's operation.

Therefore, the correct answer is B.) paste.

4. The electrolyte used in a lead storage battery is sulfuric acid.

A lead storage battery, also known as a lead-acid battery, is commonly used in automobiles. It consists of multiple cells connected in series. Each cell contains lead and lead dioxide plates immersed in a solution of sulfuric acid.

During the discharge process, sulfuric acid reacts with the lead and lead dioxide plates, producing lead sulfate and releasing electrons. The recharging process reverses this reaction, converting lead sulfate back into lead and lead dioxide.

Therefore, the correct answer is B.) sulfuric acid.

5. Fuel cells can be designed to emit no pollutants, making them an environmentally friendly energy source.

Fuel cells are electrochemical devices that convert the chemical energy from a fuel, such as hydrogen, into electrical energy. The fuel cell's main components include an anode, a cathode, and an electrolyte.

When hydrogen fuel is supplied to the anode and oxygen (usually from the air) is supplied to the cathode, a reaction occurs that releases electrons. These electrons flow through an external circuit, producing electric current. The hydrogen and oxygen react at the cathode with the help of an electrolyte to form water as the only byproduct, making fuel cells a clean energy source.

Therefore, the correct answer is D.) They can be designed so that they emit no pollutants.