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The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged). Atoms have different properties based on the arrangement and number of their basic particles.

6 0

3 years ago

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Consider the following half reaction in which nitrate is reduced to nitrite: NO3– 2H 2e– → NO2– H2O. The reaction has a ΔG°' val

drek231 [11]

Answer:

D. positive/accept

Explanation:

a) The standard gibbs free energy (ΔG⁰) is related to the standard cell potential (E⁰) as follows:

$\Delta G^{0}= -nFE^{0}-----(1)$

where n = number of electrons

F = faraday constant

The given half reaction reaction has ΔG⁰ = -81 kJ/mol. Based on equation (1) a negative value for the free energy can be obtained only if E⁰ is positive.

Thus, the negative value of ΔG°' results from the very positive value of E⁰

b) The value of E⁰ is the standard reduction potential which reflects the tendency of the system to accept electrons and get reduced. Higher (more positive) the value, greater will be the tendency to accept electrons.

Therefore, the positive E⁰ value of the redox couple NO3–/NO2– reflects the strong tendency of nitrate to <u>accept </u>electrons.

6 0

3 years ago

Which combination of formula, IUPAC name, and common name below is incorrect? Formula IUPAC Name Common Name (a) CHCl3 trichloro

vladimir2022 [97]

Answer:

option (e), dichloromethane, methene chloride

Explanation:

(a) $CHCl_3$

Common name: chloroform

IUPAC name: one carbon atom, therefore, root word is meth.

Its is saturated compounds, so add ane after root word.

Three chlorine atoms are present.

Therefore, IUPAC name: Trichloromethane

(b) $CCl_4$

Common name: Carbon tetrachloride

IUPAC name: one carbon atom, therefore, root word is meth.

Its is saturated compounds, so add ane after root word.

Four chlorine atoms are present, chlorine atoms are named as prefixes.

Therefore, IUPAC name: tetrachloromethane

(c) $C_6H_5I$

Common name: Phenyl iodide

IUPAC name:

The given compound is an aryl halides. Aryl haildes are named as haloarenes. The prefix halo is placed before aromatic hydrocarbon. Here, prefix is iodo and aromatic hydrocarbon is benzene.

Therefore, IUPAC name of the compound is iodobenzene.

(d) $CH_3Cl$

Common name: Methyl chloride

IUPAC name: one carbon atom, therefore, root word is meth.

Its is saturated compounds, so add ane after root word.

One chlorine atom is present.

Therefore, IUPAC name: chloromethane

(e) $CH_2Cl_2$

Common name: Methylene chloride

IUPAC name: one carbon atom, therefore, root word is meth.

Its is saturated compounds, so add ane after root word.

Two chlorine atoms are present, chlorine atoms are named as prefixes.

Therefore, IUPAC name: dichloromethane.

Therefore, the correct option is option (e), dichloromethane, methene chloride

8 0

3 years ago