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3 years ago

1. Electrons surround the nucleus in defined regions called _________________.

1 answer:

4 0

Negative electrons are attracted to the positive nucleus. This force of attraction keeps electrons constantly moving around the nucleus. The region where an electron is most likely to be found is called an orbital. Electrons are located at fixed distances from the nucleus, called energy levels.

So i believe the answer you’re looking for is, Orbitals.

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What is mass per unit volume called? Density Gravity Temperature Weight

slega [8]

Density is mass/volume

4 0

4 years ago

Read 2 more answers

Lridium-192 is an isotope of iridium and has a half-life of 73.83 days. if a laboratory experiment begins with 100 grams of irid

fiasKO [112]

Radioactive material undergoes first order dissociation kinetics.

For 1st order system,
k = 0.693 / t1/2
where, t 1/2 = half-life of the radioactive disintegration process.

Given that, t 1/2 = 73.83 days
Therefore, k = 0.009386 day-1

Also, for 1st order reaction,
k = $\frac{2.303}{t} log \frac{Co}{Ct}$

Given that, Co = initial concentration of Iridium-192 = 100 g

Therefore, 0.009386 = $\frac{2.303}{t} log \frac{100}{Ct}$

On rearranging we get, Ct = 100 $(0.990656)^{t}$

Answer: Ct = 100 $(0.990656)^{t}$ equation approximates the amount of Iridium-192 present after t days

8 0

3 years ago

Which of the following results in the release of nuclear energy?

Pepsi [2]

c.Both the breaking of nuclear bonds and the forming of nuclear bonds.

Explanation:

Nuclear energy is released by the breaking and forming of nuclear bonds. The breaking of nuclear bonds by unstable atoms is known as nuclear fission. The forming of nuclear bonds by combination of light atoms is known as nuclear fusion.

Nuclear fission is a radioactive decay process in which a heavy nucleus spontaneously disintegrates into lighter ones with the release of energy.
In nuclear fusion, atomic nuclei combines into larger ones with the release of large amount of energy.

Learn more:

Nuclear decay brainly.com/question/4207569

#learnwithBrainly

3 0

3 years ago

How many moles of NaF are produced in the resction between sodium bromide and calcium fluoride when 550 grams of sodium bromide

bija089 [108]

Answer: 5 moles of NaF would be produced when 550 grams of Sodium bromide are used.

Explanation:

From the question, the balanced chemical formula is illustrated below:

2NaBr + CaF2 → 2NaF + CaBr2

From the equation above;

Molecular mass of NaBr = 23 + 80 = 103g/ mol

Molecular mass of CaF2= 40+ (19×2)= 78g/ mol

Molecular mass of NaF = 23+19 = 42g/ mol

From the balanced chemical equation;

2 moles of NaBr reacted with 1mole of CaF to give 2 moles of NaF.

That is, 2 moles of NaBr= 2× 103 = 206g

2moles of NaF = 2×42= 84g

If 206g of NaBr yielded 84g of NaF

Therefore 550g of NaBr will yield Xg of NaF

X= 550×84/206

X= 224.27g of NaF

But 42g = 1 mole of NaF

Therefore 224.27g = X mole of NaF

X= 224.27 ×1/42

X is approximately 5moles.

6 0

3 years ago

____________ alcohols are alcohols having the general structure R₃COH. ____________ (or oxiranes) are cyclic ethers having the o

horsena [70]

Answer: Tertiary alcohol.

Epoxide,

phenols,

Ethers have two alkyl groups bonded to oxygen atoms

Enols

primary alcohols,

alcohols

Explanation:Tertiary alcohol are alcohols having the general structure R₃COH. Epoxide are cyclic ether with a three-membered ring. The basic structure of an epoxide contains an oxygen atom attached to two adjacent carbon atoms of a hydrocarbon. Phenol is an aromatic organic compound with the molecular formula C₆H₅OH. An alcohol contains a hydroxy group (OH group) bonded to an sp3 hybridized carbon atom. Enols are a type of reactive structure or intermediate in organic chemistry that is represented as an alkene with a hydroxyl group attached to one end of the alkene double bond. Alcohols are classified like halides and hydrogens; primary (1°), secondary (2°), or tertiary (3°) depending on the number of carbons bonded to the carbon with the halogen.

6 0

4 years ago