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a_sh-v [17]
3 years ago
13

Please help me if your good with science:).

Chemistry
1 answer:
stellarik [79]3 years ago
5 0
D an average train goes 300 km/h or 190-220 mph
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Suppose you have 100 grams of a radioisotope with a half-life of 100 years. How much of the isotope will you have after 200 year
Anastaziya [24]
Half life is 100 years.
after 1st life the number of isotopes remaining =100/2=50
after 2nd half life the number of isotopes remaining=50/2=25
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4 years ago
The charge on an ion is known as its___number.
a_sh-v [17]

Answer:

oxidation number is correct!! :)

Explanation:

8 0
3 years ago
What kind of bond would form between an iron and an oxygen atom: ionic, covalent, or metallic? What kind of bond would form betw
Nostrana [21]

Answer:

See explanation

Explanation:

Since iron is a metal and oxygen is a non metal, a bond is formed between the two when electrons are transferred from iron to oxygen. Hence the bond is ionic.

Two silver atoms are held together by metallic bonds. Metallic bond are bond forces that exist between metal atoms in a crystal lattice. The valence electrons in this bond form a cloud. Metals have low ionization energy and low electronegativity hence they loose electrons easily. This accounts for the nature of the metallic bond.

The bond formed between two chlorine atoms is a covalent bond. The valence electrons in this bond are localized between the two chlorine atoms. Chlorine is a nonmetal hence it has a high ionization energy and high electronegativity. Hence it forms covalent bonds in which electrons are shared between bonding atoms.

5 0
3 years ago
228Th -&gt; 4He+?<br> 90. 2
ki77a [65]
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7 0
3 years ago
Which of the following statements about standard reduction potential and spontaneity are true?
Dafna1 [17]

Answer:

A and C are true , B and D are false

Explanation:

For A)

from the first law of thermodynamics (in differential form)

dU= δQ - δW = δQ - PdV

from the second law

dS ≥ δQ/T

then

dU ≤ T*dS - p*dV

dU - T*dS + p*dV ≤ 0

from the definition of Gibbs free energy

G=H - TS = U+ PV - TS  → dG= dU + p*dV + V*dp - T*dS - S*dT

dG -  V*dp +  S*dT = dU - T*dS + p*dV ≤ 0

dG ≤ V*dp -  S*dT

in equilibrium, pressure and temperature remains constant ( dp=0 and dT=0). Thus

dG ≤ 0

ΔG ≤ 0

therefore the gibbs free energy should decrease in an spontaneous process → A reaction with a negative Gibbs standard free energy is thermodynamically spontaneous under standard conditions

For B) Since the standard reduction potential is related with the Gibbs standard free energy through:

ΔG⁰=-n*F*E⁰

then, when ΔG⁰ is negative , E⁰ is positive and therefore a coupled redox reaction with a positive standard reduction potential is thermodynamically spontaneous.

5 0
3 years ago
Read 2 more answers
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