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1) Which option describes a situation in which reduction occurs?(1 point)
S2– becoming S
Cl2 becoming Cl–
Al becoming Al3+
Xe2+ becoming Xe6+

2) Use the chemical equation to answer the question.
2Ag(s) + H2S(g) → Ag2S(s) + H2(g)
Does this equation represent a redox reaction?

No, it does not because neither hydrogen (H) nor silver (Ag) transfers electrons.
Yes, it does because silver (Ag) undergoes reduction and hydrogen (H) undergoes oxidation.
Yes, it does because hydrogen (H) undergoes reduction and silver (Ag) undergoes oxidation.
No, it does not because sulfur (S) does not change oxidation states.

3) Which product forms when two or more nonmetal atoms share valence electrons?
a monoatomic ion
a redox reaction
an ionic compound
a covalent compound

4) Which phrase best defines a galvanic cell?
an object that converts stored chemical energy into electrical energy
an object that makes electrical connections
an object that oxidizes atoms to produce ions
an object that produces electrical energy through redox reactions

Sagot :

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Answer:

1. Cl2 becoming Cl–

2. Yes, it does because hydrogen (H) undergoes reduction and silver (Ag) undergoes oxidation.

3. a covalent compound

4. an object that produces electrical energy through redox reactions

Explanation:

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Oxidation implies electron gain while reduction implies electron loss.

Reduction is a process by which a chemical specie gains electrons. We can tell that reduction has occurred when there is a decrease in oxidation number. This is clearly shown in the transformation; Cl2 becoming Cl–. The oxidation number of chlorine decreased from 0 to -1.

The equation; 2Ag(s) + H2S(g) → Ag2S(s) + H2(g) represents a redox reaction because the oxidation number of silver increased from zero to +1 while the oxidation number of hydrogen decreased from +1 to zero. Hence silver was oxidized and hydrogen was reduced.

The product forms when two or more nonmetal atoms share valence electrons,  is a covalent compound. Covalent compounds are formed by sharing of electrons between atoms.

A galvanic cell produces electrical energy through redox reactions.

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