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3 years ago

Melting of ice is a spontaneous reaction at room temperature and pressure because melting is accompanied by _____.

Chemistry

1 answer:

ki77a [65]3 years ago

4 0

Answer:

An increase in entropy

Explanation:

In ice, the molecules are very well ordered because of the H-bonds. As ice melts, the intermolecular forces are broken (requires energy), but the order is interrupted (so entropy increases). Water is more random than ice, so ice spontaneously melts at room temperature.

Just think about this rationally. Melting ice (or anything) will require heat put in (this is called the latent heat of fusion), so you automatically know that the change in enthalpy is going to be positive. In order to make the reaction spontaneous, delta G, the Gibbs free energy has to be negative. So now look at the formula Delta(G) = Delta(H) - T*Delta*(S). If you know that g is negative, and H is positive, then it is only possible if -T*Delta(S) is negative. If that is positive, then Delta(S) has to be positive. So theres your answer :). An increase in entropy

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Calculate freeze 62.9 g of iron at 1535oC Hf (J/g)=257

Inessa [10]

Answer:

-16200J

Explanation:

(257J/g)(62.9g)

eliminate the variables

u get 16165.3

go to 3 significant digits

u get 16200

and since it is freezing we are taking out energy so it would be

-16200J

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3 years ago

1.00 pint of milk has a volume of how many milliliters

zlopas [31]

I searched it up on Google and I got 473.176 Hope this helps.

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3 years ago

A gas quickly expands in an isolated environment. During the process, the gas exchanges no heat with its surroundings. The proce

AysviL [449]

Answer:

e. adiabatic process

Explanation:

Adiabatic process -

In the thermodynamic system , an adiabatic process is the one which involves no transfer of mass or heat of the substance , is referred to adiabatic process.

In this process , the temperature need not be constant ,

But only the heat is transferred into or out of the system .

Hence, from the given information of the question,.

The correct option is e. adiabatic process .

6 0

3 years ago

When water vapor changes to a liquid what is it called

Mademuasel [1]

Answer:

$hello \: your \: answer \: is \: here.$

Explanation:

<h2>Condensation is the change of water from its gaseous form (water vapor) into liquid water. Condensation generally occurs in the atmosphere when warm air rises, cools and looses its capacity to hold water vapor. As a result, excess water vapor condenses to form cloud droplets.</h2>

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5 0

3 years ago

Explain how understanding the way materials behave can allow scientists to design technology.

torisob [31]

Answer and Explanation:

Materials are generally categorized into four main groups: metals, polymers, ceramics, and composites. Here are major types of material properties. They include: Physical, Chemical, Thermal, Acoustical, Mechanical, Optical, Electrical and Magnetic. These properties influence the way materials behave under certain conditions and environment, it is these behavioral changes of materials that scientists exploits to create new and different technologies.

There has been a major impact on material science due to the rapid rate of scientific discovery and new technologies, giving scientists many more materials from which to choose for their products. Advent of these new materials have given place for smart new products or quality classic designs.

Making the right choice of material is a complex and also a difficult task considering the numerous physical, chemical, optical, electrical, magnetic, thermal, aesthetic, mechanical and other appropriate properties to consider. Also, environmental, ethical and moral issues surrounding the right choice of materials for use in any product, service or system for design also need to be considered.

Materials would be developed to have specific properties. The development of new materials allows designers to be able to create new products, thereby solving old problems in numerous new ways. For instance, the explosion of plastic materials after the second world war made it possible to create new products without using valuable metals.

It is therefore the understanding of these material's behaviors after series of laboratory and industrial experiments have been carried out on them that scientists would take advantage of in order to create new designs.

For example, materials with photochromicity behaviors, that is, ability to change colors when exposed to light, can be useful for creating sunglasses lenses that darkens as the sun brightens.

The behavior of the choice of material was understood first through series of experiments which then helped the scientists to design such kind of sunglasses.

6 0

3 years ago