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3 years ago

What are some chemical and physical properties of soap (saponification) please help it’s very urgent!

1 answer:

5 0

Answer: Soaps are sodium or potassium fatty acids salts, produced from the hydrolysis of fats in a chemical reaction called saponification. Each soap molecule has a long hydrocarbon chain, sometimes called its 'tail', with a carboxylate 'head'.

Explanation: Saponification is an exothermic chemical reaction—which means that it gives off heat—that occurs when fats or oils (fatty acids) come into contact with lye, a base. In this reaction, the triglyceride units of fats react with sodium hydroxide or potassium hydroxide and are converted to soap and glycerol.

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Determine the total time that must elapse until only ¼ of an original sample of the radioisotope Rn-222 remains unchanged.

Arte-miy333 [17]

Answer:

7.6 days

Explanation:

Radon is a radioactive element and Radon-222 is it's most stable isotope. The half-life of Radon-222 has been found to be approximately 3.8 days.

Let, the initial amount of the Rn-222 = 1 = A

Final amount = $\frac{1}{4}$ = A'

We will use the following relation for calculating time elapsed in the decay

$A' = A(\frac{1}{2} )^\frac{t}{t_1_/_2} }$

Thus,

$\frac{1}{4} =1(\frac{1}{2} )^\frac{t}{3.8}$

We can write is as,

$(\frac{1}{2} )^2=(\frac{1}{2} )^\frac{t}{3.8}$

Since the base in both sides are equal, powers can also be equal and thus,

$2=\frac{t}{3.8}$

So, t = 7.6 days

5 0

3 years ago

Determine the number of unpaired electrons in Ca?

serg [7]

When an electron occupies an orbital of an atom singly, rather than an electron pair such electron is said to be an unpaired electron. Each atomic orbital of an atom specified by quantum numbers can contain a maximum of two electrons having opposite spins, electron pair.

The numbers of unpaired electrons are determined by the electronic configuration of an atom. The electronic configuration of calcium, $Ca$ is:

$1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}$ or $[Ar]4s^{2}$

Since, from the electronic configuration it is clear that the number of electrons in valence orbital that is $4s$ is 2 that means the electrons are paired up in the valence orbital so, there are no unpaired electrons present in $Ca$ .

Hence, the number of unpaired electrons in $Ca$ is 0.

3 0

3 years ago

Help me with these questions google won’t tell them for me!!

Irina-Kira [14]

Sorry this is long, it’s the best I’ve got. The name was chosen based on the time of year (around December) during which these warm waters events tended to occur. The term El Niño refers to the large-scale ocean-atmosphere climate interaction linked to a periodic warming in sea surface temperatures across the central and east-central Equatorial Pacific. The term El Niño refers to the large-scale ocean-atmosphere climate interaction linked to a periodic warming in sea surface temperatures across the central and east-central Equatorial Pacific. The vast tropical Pacific Ocean receives more sunlight than any other region on Earth. Much of this sunlight is stored in the ocean in the form of heat. During an El Niño water temperatures in the Pacific Ocean may rise on average 3 - 5 degrees above average

7 0

3 years ago

Which list includes three types of chemical reactions?

irina1246 [14]

I think the correct answer from the choices listed above is option B. The list which includes three type of chemical reactions would be decomposition, single replacement, and double replacement. These are the most basic reactions in chemistry and are the basis for other types of reactions.

6 0

3 years ago

A gas that exerts a pressure of

Semenov [28]

Answer:

3.1L

Explanation: using Boyle's law p1v1=p2v2

p1=15.6,v1=?,p2=25.43,v2=1.895

manipulate the formula to favor so to find v1 the formula would be

p2v2/p1

25.43*1.895\15.6=3.1L

3 0

3 years ago