CHEMISTRY HIGH SCHOOL

Which element has the same number of energy levels as krypton (Kr) and the same number of valence electrons as nitrogen (N) ? iron (Fe)
selenium (Se)
arsenic (As) c
alcium (Ca)

Answers

Answer 1
Answer:

Answer:

The correct answer is the option: arsenic (As).

Explanation:

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Let's solve this!

Nitrogen is in group V period 2 and has 5 valence electrons.

The krypton is in period 4.

If we cross these two elements, the element that is in the same group as nitrogen (V) and in the same period as Kripton (4) is Arsenic. If you have any questions, we can check it on the periodic table.

We conclude that the correct answer is the option: arsenic (As).
Answer 2
Answer:

Answer:

The answer to your question is: Arsenic (As)

Explanation:

Krypton is a noble gas located in group VIII A and 4rd period. Nitrogen is in the 5fh group.

So, we must look for an element located in the 4rd period and group VA.

Iron (Fe)               Iron is in the 4rd period and group VI B

Selenium (Se)     Selenium is in the 4rd period and group VI A

Arsenic (As)       Arsenic is in the 4rd period and group V A and group VA

Calcium (Ca)     Calcium is located in group 4rd and group IIA

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Limestone is primarily a crystal form of caco 3 ​ . How many moles of oxygen are in a 1.25 mol sample of caco 3 ​ ? Only include the numerical value in your answer. Do not include units.

Answers

There are 3.75 moles of oxygen in a 1.25 mol sample of CaCO₃.

Limestone is primarily a crystal form of CaCO₃ (calcium carbonate). According to its chemical formula, the molar ratio of CaCO₃ to O is 1:3. The moles of oxygen in 1.25 moles of CaCO₃ are:

1.25 mol CaCO_3 * (3molO)/(1molCaCO_3) = 3.75molO

There are 3.75 moles of oxygen in a 1.25 mol sample of CaCO₃.

You can learn more about molar ratios here: brainly.com/question/9408497

As the molecular formula of CaCO₃ suggested, that there are 3 moles of oxygen are there in 1 mole of CaCO₃.

So in 1.25 mol of CaCO₃ contains=1.25 ×3 moles of oxygen  

                                                    =3.75  moles of oxygen

So there are 3.75  moles of oxygen are there in 1.25 mol of CaCO₃.

Paintball is a popular recreational activity that uses a metal tank of compressed carbon dioxide or nitrogen to launch small capsules of paint. A typical tank has a volume of 508 cubic centimeters. A 340. gram sample of carbon dioxide is added to the tank before it is used for paintball. At 20.oC, this tank contains both CO2(g) and CO2(l). After a paintball game, the tank contains only CO2(g).Determine the total number of moles of CO2 added to the tank before it is used for paintball.

Answers

The total number of moles of CO₂ added to the tank before it is used for paintball is 7.73 moles.

What is a mole ?

A mole of a substance is that containing 6.022 * 10^23 molecules of that substance

A 340 gm sample of carbon dioxide

Molecular weight = 44

Moles added to the tank = mass/ molecular meight

Moles added to the tank = 340 /44

= 7.73 moles

The total number of moles of CO₂ added to the tank before it is used for paintball is 7.73 moles.

To know more about mole

brainly.com/question/26416088

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We know,
1000 cm³ = 1 L
1 cm³ = 1 / 1000 L
508 cm³ = (1 / 1000) * 508 L = 0.5080 L

So, 508 cm³ = 0.5080 L

Now,
We know,
22.4 L = 1 mole
1 L = 1 / 22.4 mole
0.5080 L = (1 / 22.4) * 0.5080L = 0.0227 moles

So, 0.0277 moles  moles of CO_2 are added to the tank before it is used for paintball.

What body system does the Arterial wall and the Fatty deposit belong to

Answers

Answer:

The wall of the arteries belongs to the circulatory system.  The fat deposit belongs to the adipose connective tissue.

Explanation:

The arterial system is the high pressure portion of the circulatory system. Blood pressure ranges from the maximum pressure during cardiac contraction, called systolic pressure, to the minimum pressure, or diastolic pressure, between contractions when the heart rests between cycles. This variation in pressure in the arteries produces a pulse that is observable in any artery, and is an indicator of cardiac activity. The wall of the arteries is thick, formed of elastic muscle tissue.

Adipose tissue is a type of connective tissue with special properties. It has many adipocytes, specialized cells, which have the main function of energy reserve, through a fat deposit, for the body, among others. Fat is deposited in fat cells also called adipocytes.

Final answer:

The arterial wall and fatty deposit belong to the cardiovascular system.

Explanation:

The arterial wall and the fatty deposit belong to the cardiovascular system in the human body.

Learn more about Cardiovascular System here:

brainly.com/question/23086799

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State one conclusion from Rutherford experiment that contradicted one conclusion made by Thompson

Answers

One conclusion from Rutherford's experiment that greatly contradicted Thompson's experiment is that 'atoms are mostly empty space, with positively charged nucleus'. While Thompson concluded that there are negatively charged particles as part of the internal structure of the atoms. 

Answer:

One conclusion from Rutherford's experiment that greatly contradicted Thompson's experiment is that 'atoms are mostly empty space, with positively charged nucleus'.

Explanation:

Sarah is testing how quickly saltwater freezes. She adds saltwater to one ice tray and plain water to another ice tray. She places each tray in the freezer and records the time when each one starts to freeze. What treament did she do?. . A.Salt. B.Water. C.Freezer. D.Ice tray

Answers

The correct answer is A. Salt

That is because all of the conditions and the ingredients are the same. The one thing that makes the difference is the salt, which if removed, would cause everything to be the same. If she knows at how much regular water freezes, she can easily see how salt impacted the difference.

Answer:

salt

Explanation:

Which is an example of chemical weathering?

Answers

Acid rain raining on rocks and breaking it down from the reaction of the chemicals.
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