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3 years ago

WILL MARK BRAINLIEST!!! Which of the following combinations will result in a reaction that is never spontaneous?

1 answer:

4 0

2.

G=H-TS
G=(+)-T(-)
G=(+)+(+)

Since G would be positive no matter what the temperature could be, the reaction could never be spontaneous.

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In salt, what is the nature of the bond between sodium and chlorine? in salt, what is the nature of the bond between sodium and

kifflom [539]

A chemical bond that involves the transfer of electrons from a metal to a nonmetal and thus forms ions and the atoms in the molecule are attracted towards each other through electrostatic force of attraction are said be ionic bond. In short, the bond formed between the two oppositely charged ions.

In salt, the compound formed between sodium and chlorine is sodium chloride having molecular formula $NaCl$ where sodium is a metal and chlorine is the non-metal. The formation of the compound takes place by transfer of an electron from sodium thus forming a cation of formula $Na^{+}$ to chlorine which gains electron and thus results in an anion formation having formula $Cl^{-}$ . The force of attraction between these oppositely charged ions that helds them together and results in formation of $NaCl$ compound is electrostatic force of attraction.

Hence in salt, the nature of bond between sodium and chlorine is ionic.

4 0

4 years ago

How did the mass change when the copper coin was made to look silver?

il63 [147K]

We have that The the mass change when the copper coin was made to look silver is an increase in mass

Correct option C

It increased.

It is important to note that the copper coin after its cutting into shape will have a specific mass or weight and the silver coating solution will also have a net value of mass or weight

Therefore

The the mass change when the copper coin was made to look silver is an increase in mass

Correct option C

It increased.

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7 0

3 years ago

A sample of an unknown gas takes 222 s to diffuse through a porous plug at a given temperature. At the same temperature, N2(g) t

gulaghasi [49]

Answer:

$\large \boxed{\text{45.1 g/mol}}$

Explanation:

Graham’s Law applies to the diffusion of gases:

The rate of diffusion (r) of a gas is inversely proportional to the square root of its molar mass (M).

$r \propto \dfrac{1}{\sqrt{M}}$

If you have two gases, the ratio of their rates of diffusion is

$\dfrac{r_{2}}{r_{1}} = \sqrt{\dfrac{M_{1}}{M_{2}}}$

The time for diffusion is inversely proportional to the rate.

$\dfrac{t_{2}}{t_{1}} = \sqrt{\dfrac{M_{2}}{M_{1}}}$

Data:

t₂ = 222 s

t₁ = 175 s

M₁ = 28.01

Calculation :

$\begin{array}{rcl}\dfrac{222}{175} & = & \sqrt{\dfrac{M_{2}}{28.01}}\\\\1.269 & = & \sqrt{\dfrac{M_{2}}{28.01}}\\\\1.609 & = & \dfrac{M_{2}}{28.01}\\\\M_{2} & = & 1.609 \times 28.01\\ & = & \textbf{45.1 g/mol}\\\end{array}\\\text{The molar mass of the unknown gas is $\large \boxed{\textbf{45.1 g/mol}}$}$

3 0

3 years ago

What is the balance of S8+Br2=S3Br7

GalinKa [24]

Answer:

3S₈ + 28Br₂ => 8S₃Br₇

Explanation:

Start with either sulfur (S) or bromine (Br) and balance ...

3S₈ + Br₂ => 8S₃Br₇ or S₈ + 7/2Br₂ => S₃Br₇

Balance the remaining reactant ...

3S₈ + 56/2Br₂ => 8S₃Br₇

Remove fractions by multiplying by the fraction's denominator

2(3S₈ + 56/2Br₂ => 8S₃Br₇) => 6S₈ + 56Br₂ => 16S₃Br₇

Reduce to smallest whole number ratio => standard equation at STP ...

3S₈ + 28Br₂ => 8S₃Br₇

8 0

3 years ago

What is the enthalpy of reaction for the decomposition of calcium carbonate?

77julia77 [94]

Answer:

First Blank: 656.3 kJ

Second Blank: Endothermic

Explanation:

Edge 21'

4 0

3 years ago