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3 years ago

Which equation shows a physical change?

2 answers:

7 0

H2O(g) --> H2O(s)

This is the change of phase from gas to solid, which is a physical change.

The other equations correspond to chemical changes given that the origin subtances are forming different substances

ludmilkaskok [199]3 years ago

7 0

<u>Answer:</u> The correct equation is $H_2O(g)\rightarrow H_2O(s)$

<u>Explanation:</u>

A physical change is defined as the change in which there is change in shape and size of the object and no change in the chemical composition of the substance. In this process, no new substance gets formed.

A chemical change is defined as the change in which chemical composition of the substance gets changed and new substance gets formed.

From the given options:

In first three options, new substances are getting formed and hence they are considered as a chemical change.

Only in last option, there is change in the physical state of matter that is change from gaseous state to solid state. No new substance is getting formed.

Hence, the correct equation is $H_2O(g)\rightarrow H_2O(s)$

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Answer: I’m pretty sure that it’s C.
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3 years ago

Besides thermal energy, what other forms of energy can be changed to thermal energy?

LuckyWell [14K]

Answer:

Besides electrical, chemical, and thermal energy, some other forms of energy include mechanical and sound energy. Any of these forms of energy can change into any other form. Often, one form of energy changes into two or more different forms.

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3 years ago

What is the charge of 5protons 6 neutrons and 5 electrons

Darya [45]

Answer:

In this case the mass number would be 11.

Explanation:

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3 years ago

Name the three functional groups in the compound pictured.

oksian1 [2.3K]

The three functional groups shown in the image are: ester, alkoxy and carboxyl.

<h3>What are functional groups?</h3>

Chemical properties depend on its structure. Certain properties, too, are attributable to an atomic group ordered in a particular way, apart from the whole of the molecule. Such groups of atoms that determine the chemical properties of compounds are called<em> functional groups</em>.

The functional group can be on the primary, secondary, or tertiary carbon.

Functional groups are often found on molecules of biological importance.

Functional groups are usually formed by a set of elements such as carbon, hydrogen and oxygen, attached to the hydrocarbon chain, giving the molecule characteristics. Can also include other elements such as sulfur or nitrogen.

Molecules can have more than one functional group on it, having different combinations on it that can affect properties of the molecule such as solubility, structure, or reactivity.

Carboxyl groups are usually seen in amino acids, fatty acids and other molecules since it is a fairly common functional group.

Therefore, we can confirm that the three functional groups shown in the image are: ester, alkoxy and carboxyl.

To learn more about functional groups visit: brainly.com/question/14618322?referrer=searchResults

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1 year ago

NO LINKS PLEASE! Why does dye dropped into a cup of water eventually spread throughout the water?

Nezavi [6.7K]

Answer:

Explanation:

okay, you need to look at the structures of the particles of matter in the solid, liquid and gas.

particles in a solid are in fixed positions, where they can only vibrate in those positions ( take a look at ice, or rather, a brick)
liquids have very small or rather, no spaces between them, but they can slide or rub against each other, like people in a <em>really tight</em> crowd I guess
gas particles have very large spaces between them and they move randomly. these exibit what's called brownian motion.

since water particles (and all other liquid particles) have negligible spacings and limited movement, that allows the dye particles to move from a region of high concentration to that of a low concentration. the aim for this is for the mixture/solution to reach an equilibrium, that is the mixture must get to a point where all regions have the same concentration of the dye.

you can refer to your coursebooks :)

correct where wrong please:)

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2 years ago