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4 years ago

Match each processes with the correct transfer of energy.

Chemistry

1 answer:

sveticcg [70]4 years ago

7 0

freezing-energy lost (exothermic)

sublimation-energy gain (endothermic)

evaporation- energy gain(endothermic)

Melting- energy gain(endothermic)

deposition- energy lost(exothermic)

condensation-energy lost(exothermic)

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The molality of a solution containing 8.1 moles of solute in 4,847 g of solvent is _____. 1.7m 598m 39m 0.17m

Hitman42 [59]

When molality = no.of moles of solute/weight Kg of solvent

and when we have the no. of moles of solute = 8.1 moles
and the weight Kg of the solvent =4847 g /1000 = 4.847 Kg
so by substitution :
Molarity = 8.1m / 4.847Kg = 1.67 M

4 0

4 years ago

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The molecule carbon disulfide CS2 is nonpolar and has only london dispersion forces between the molecules.Carbon tetrachloride C

SSSSS [86.1K]

Answer:- Melting point of [tex[CCl_4[/tex] is higher than $CS_2$ where as the vapor pressure of $CS_2[/tex[ is higher than [tex]CCl_4$ .

Explanations:- Since both the molecules are non polar, the forces of attraction for carbon tetrachloride are comparatively stronger as it's a bigger molecule. We know that, stronger are the forces of attraction, higher is the melting point as more heat is required to break the bonds.

Stronger are the forces of attraction, lower is the vapor pressure as the molecules are more tightly bonded and less molecules goes to the gas phase.

So, melting point of carbon tetrachloride is higher but it's vapor pressure is lower as compared to carbon disulfide.

3 0

4 years ago

Read 2 more answers

Identify the polynomial. x3- y3 + z monomial binomial trinomial

Firdavs [7]

Answer: Option (c) is the correct answer.

Explanation:

A monomial is defined as an algebraic expression in which there is only one term present.

For example, 3x is a monomial.

A binomial is defined as an expression where there will be two terms present. For example, $(x^{2} + y^{2})$ is a binomial.

A polynomial is defined as an algebraic expression which contains more than two terms.

For example, $x^{3} - y^{3} + z$ is a polynomial.

Thus, we can conclude that the given expression $x^{3} - y^{3} + z$ is a polynomial.

6 0

3 years ago

Urea is a common fertilizer with the formula CO(NH2)2 that is sometimes used as a chemical de-icer for icy road surfaces in the

nordsb [41]

Answer:

The answer to your question is molality = 0.61

Explanation:

Freezing point is the temperature at which a liquid turns into a solid if a solute is added to a solution, the freezing point changes.

Data

Kf = 1.86 °C/m

molality = ?

ΔTc = 1.13°C

Formula

ΔTc = kcm

Solve for m

m = ΔTc/kc

Substitution

m = 1.13 / 1.86

Simplification and result

m = 0.61

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4 years ago

He resonance structures of carbon monoxide are shown below. show how each structure can be converted into the other using the cu

Ugo [173]

The two resonating structures of Carbon Monoxide are shown below.
The movement of electrons are shown by arrow.

Structure A:
In structure a A the formal charges of Carbon and Oxygen are zero. As Formal Charge is calculated as,

= # of valence electron - electrons in lone pairs + 1/2 bonding electrons electrons

For C:
= 4 - 2 + 4/2
= 4- 4
= 0

For O:
= 6 - 4 + 4/2
= 6- 6
= 0

Structure B:

Formal Charge on C:

= 4 - 2 + 6/2
= 4- 5
= -1

Formal Charge on O:

= 6 - 2 + 6/2
= 6 - 5
= +1

4 0

3 years ago