Answer:I believe its A. There noble gasses so there happy with there electron count!
Explanation:
Group 18 noble gases are relatively inert because their s and p orbitals are filled, meaning their outer energy level is filled. Therefore option 1 is correct.
The noble gases, which include elements like helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn), belong to Group 18 (VIII A) of the periodic table.
These elements have a full complement of electrons in their outermost energy level, also known as the valence shell. This outermost energy level is comprised of s and p orbitals.
Having a filled outer energy level makes noble gases highly stable and unreactive. The stability arises from the fact that their electron configurations are complete, meaning they have achieved a configuration similar to the noble gas that precedes them in the periodic table.
Because noble gases have no missing or unpaired electrons in their outer energy levels, they have little tendency to gain, lose, or share electrons with other atoms.
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To take a weighted average of all the naturally occurring isotopes of an element in order to arrive at an average
atomic mass, you would
o multiply the mass of each isotope by the decimal fraction representing its abundance naturally, then add all these products
together.
O use the isotope with the largest mass.
O use the isotope with the most average mass.
o add all the masses of all of the isotopes, then divide by the number of isotopes.
Answer:
o multiply the mass of each isotope by the decimal fraction representing its abundance naturally, then add all these products together.
Explanation:
To find the average atomic mass of an atom, take the weighted average of all naturally occurring isotopes of an element and sum them together.
The average atomic mass is determined from the geonormal abundances of the isotopes.Average mass of all isotopes = summation of all the mass of isotopes of the element x abundance of the isotope.
The abundance of the isotope is usually taken as a decimal fraction.
When a new synthetic method is developed, it is applied to a series of compounds to explore its utility. 4-Fluorophenylacetonitrile was used as a substrate in a synthetic methodology research paper. Provide a synthesis for 4-fluorophenylacetonitrile using an SN2 reaction. Begin with a retrosynthesis of the target molecule. identify all
Answer:
See explanation
Explanation:
Since the -CH3CN and the -F are in 1,4 position, then the synthesis started with flourobenzene. This has to be because -F is ortho-para directing in nucleophilic substitution.
The next step is the Friedel craft alkylation of the substrate. The alkyl group is directed to the para position by the -F.
Bromination using NBS yields an alkyl bromide that undergoes SN2 substitution to yield the target compound.
How would one convert 36 yd to centimeters 2.54 cm = 1 in)?
Answer:
D
Explanation:
A P E X
D is the correct process to convert 36 yds to centimetres 2.54 cm = 1 in.
What are centimetres?A metric unit of length, equal to one-hundredth of a metre.
To convert a yard measurement to a centimetre measurement, multiply the length by the conversion ratio. The length in centimeters is equal to the yards multiplied by 91.44.
D is the correct process to convert 36 yds to centimetres 2.54 cm = 1 in.
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What is one long-lasting climate change?
Answer:
Scientists have predicted that long-term effects of climate change will include a decrease in sea ice and an increase in permafrost thawing, an increase in heat waves and heavy precipitation, and decreased water resources in semi-arid regions
Explanation:
HEMP ME ITS DUE BY MIDNIGHT
Answer:
Explanation:
Option B is the correct answer
What happens at the cathode
Answer:
At the cathode in an electrolytic cell, ions in the surrounding solution are reduced into atoms, which precipitate or plate out on to the solid cathode. The anode is where oxidation takes place, and the cathode is where reduction takes place. The anode is defined as the electrode where oxidation occurs. The cathode is the electrode where reduction takes place. ... At the cathode, the metal ion in the solution will accept one or more electrons from the cathode, and the ion's oxidation state will reduce to 0. This forms a solid metal that deposits on the cathode.
A force of 49 Newtons is applied to a rock, which causes it
to be lifted 2 meters in 5 seconds. How much power is
exerted during this time?
Answer:
19.6Watts
Explanation:
Given parameters:
Force applied = 49N
Distance = 2m
Time = 5s
Unknown:
Power = ?
Solution:
Power is the rate at which work is being done;
Power = [tex]\frac{Work done }{time}[/tex]
Work done = force x distance = 49 x 2 = 98J
So;
Power = [tex]\frac{98}{5}[/tex] = 19.6Watts
When metal atoms bond with nonmetal atoms, what will the non metal atoms do?
Answer:
Ionic bonding involves the transfer of electrons from a metal atom to a non-metal atom until the outer shells of their resultant atoms are similar to that of a noble gas. The metals lose electrons and form cations while the non-metals accept the electrons and form anions.
When a chemical bond forms between metal and nonmetal atoms, the nonmetal atom accepts electrons from the metal atom to reach a stable state.
A bond that forms between metal and nonmetal atoms is called an ionic bond. In ionic bonding, the metal atom, the cation, donates electrons to the nonmetal atom, the anion.
Thus, both electron donor and acceptor are able to reach an octet state through donation/acceptance of electrons and an ionic bond is formed as a result.
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What is a molecular formula
Someone help me pls!
Answer:
thermal energy from the sun
Explanation:
because the sun have more potencia
Describe the evidence of changes in organisms in the Cambrian Era that are reflected in the fossil record.
Answer:
Morphology and phylogenetics revealed by fossils. Perhaps the strongest evidence to support the Cambrian evolutionary explosion of animal forms is the first clear appearance, in the Early Cambrian, of skeletal fossils representing members of many marine bilaterian animal phyla
Explanation:
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How does the skin help regulate body temperature?
HELP FAST
Answer:
1. The body's immense blood supply (when blood vessels dilate or become larger heat loss occurs) When the blood vessels constrict it holds in heat
2. The skins blood supply also helps maintain body temperature (helps maintain homeostasis which is the "normal" state of our body)
3. Humidity in the air effects thermoregulation (heat regulation in the body) by limiting sweat evaporation (usually sweat evaporates into the environment when the humidity is low because the air has low "water levels" per say while you have high "water levels" because of your sweat
What best describes how the testing of the initial version and the testing of the beta version fit into the four stages of the process of technological design
Answer:
C. The initial version is tested during the third stage to determine what needs to be improved, and the beta version is tested during the fourth stage to ensure that criteria are met.
Explanation:
Edge 2021
The Testing of the initial version is carried out in the third stage to determine what needs to be improved, while the testing of the beta version is carried out during the fourth stage to ensure that all necessary criteria are met.
The process of technological design involves several distinctive processes which can be broken down into four stages.
The four stages involved in the process of technological design are :
Identify a need : during this process the engineer identifies a problem that needs to be resolved design a solution : an initial design is created to provide a solution to the problem identified in stage 1Implement the solution : The design is tested and implemented if successfulevaluate the solution : In this stage the result from the solution ( beta version ) is subjected to ensure that all criteria are methence the testing of the initial version is to determine what needs improvement while the testing of the beta version is to ensure all criteria are met
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How would the strength of an electromagnet change if a copper core was
used to replace its iron core?
O A. It would decrease.
B. It would stay the same.
C. It would increase.
D. It would vary unpredictably.
SUBMIT
Answer:
C
Explanation:
Answer: decrease I believe
Explanation:
Just because if you replaced copper with iron it gets stronger
PLEASE HELP ASAP!!!! I give extra points to those who help me!
Explain how you can estimate the number of neutrons in the atoms of an element.
Answer:
to determine the number of neutrons in atom, we only have to subtract the number of protons from the mass number. the nucleus of an atom is composed of protons and neutrons. And the number of particles present in the nucleus is referred as mass number (Also, called as atomic mass).
Explanation:
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Si un elemento químico tiene un numero atomico z=12, y es un atomo neutro (igual cantidad de electrones y protones), ¿Cual es la configuracion electronica esperada?
Answer:
1s² 2s² 2p⁶ 3s²
Explanation:
La configuración electrónica muestra la secuencia de llenado de electrones en los orbitales de los subniveles guiada por algunos principios.
El número máximo de electrones en los orbitales de los subniveles es dos para el subnivel s (un orbital); seis para el subnivel p (tres orbitales); diez para el subnivel d (cinco orbitales) y catorce para el subnivel f (siete orbitales). Esto indica que el número máximo de electrones en un orbital es dos.
Se sabe que un elemento químico que tiene un número atómico Z = 12 y es un átomo neutro es Magnesio (Mg). Sin embargo, dado que tiene el mismo número de protones y electrones; La configuración electrónica esperada se puede escribir como:
1s² 2s² 2p⁶ 3s²
How to test for ionic and covalent substances
Answer:
An easy way of determining the type of bond within a molecule is to look for the type of compound involved.
The equilibrium constant Kc for the reaction below is 0.00584 at a certain temperature. Br2(g) ⇌ 2Br(g) If the initial concentrations are [Br2] = 0.0345 M and [Br] = 0.0416 M, calculate the concentrations of these species at equilibrium.
Answer:
Explanation:
Given that:
The chemical equation for the reaction is:
Br2(g) ⇌ 2Br(g)
Initially 0.0345M 0.0416M
[tex]Q_C = \dfrac{[Br]^2}{[Br_2]} = \dfrac{(0.0416)^2}{(0.0345)}= 0.05016[/tex]
[tex]Q_C =0.05016 >>> K_c(0.00584)[/tex]
Thus, the given reaction will proceed in the backward direction
The I.C.E table is as follows:
Br2(g) ⇌ 2Br(g)
I 0.0345 0.0416
C +x -2x
E (0.0345+x) (0.0416 -2x)
[tex]K_c = \dfrac{[Br]^2}{[Br_2]} = \dfrac{(0.0416-2x)^2}{(0.0345+x)} = 0.00584[/tex]
= 0.00173056 - 0.0832x - 0.0832x + 4x² = 0.00584 (0.0345 +x)
= 0.00173056 - 0.166x + 4x² = 2.0148× 10⁻⁴ + 0.00584x
= 0.00173056 - 2.0148× 10⁻⁴ - 0.166x - 0.00584x + 4x²
= 0.00152908 - 0.17184x + 4x²
Solving by using Quadratic formula
x = 0.03038 or 0.0126
For x = 0.03038
At equilibrium
[Br₂] = (0.0345 + 0.03038) = 0.06488 M
[Br] = (0.0416 -2(0.03038)) = - 0.01916 M
Since we have a negative value for [Br], we discard the value for x
For x = 0.0126
At equilibrium
[Br₂] = (0.0345 + 0.0126) = 0.0471 M
[Br] = (0.0416 -2(0.0126)) = 0.0164 M
What are the characteristics of Venus
Answer:
Venus is very hot because of the clouds that surround it. It is roughly the same size as Earth, it is just a little smaller. Venus is a rocky planet and has a lot of volcanoes.
That's all I know, you might have to research it. :/
can you solve this 2+__=9 (constants) and __+__9 (variables)
Answer:
2+7=9(constant)
6.5+2.5=9(variable)
The half-life of cobalt-60 is 5.26 years. If a sample originally contained 220 grams of this isotope, how many grams would be left after 10.52 years?
Answer:
Question Answer
The half-life of cobalt-60 is 5.26 years. How many half-lives have passed in 10.52 years? 2
12.5% of a radioactive sample are left. How many half-lives have passed? 3
After 3 half-lives, how much of a 400 gram sample of radioactive uranium remains? 50g
Explanation:
QUESTION 8: When would acceleration increase most? *
2 points
Rolling along a flat plane
Rolling down a steep hill
Braking to a stop
Rolling up a gently sloping hill
Answer:
Rolling down a steep hill
Explanation:
Angela is a serious basketball player, but lately she has been struggling. First, her legs started getting tired halfway through practice. Next, her bones started aching. This week, she feels like she can’t even take a full breath.
Angela goes to see Dr. Chao. “I feel like my whole body is falling apart. How can there be so many different things going wrong with me at the same time?” Angela asks. Dr. Chao does a physical exam and asks Angela to take a few deep breaths. “Actually,” the doctor responds, “there’s only one small thing wrong with your lungs. Fortunately, there is a medicine that will improve all your symptoms right away.”
How can a problem in Angela’s lungs cause problems all over her body?
Answer:
Because the entire body functions off of the air given to the body through the lungs.
HELP!
Suppose 4.0 grams of H2 were used? How many grams of water would be produced?
Answer:
36g
Explanation:
Given parameters:
Mass of H₂ = 4g
Unknown:
Mass of water produced = ?
Solution:
The reactants in this experiment are hydrogen and oxygen gas. The product formed will be water, H₂O.
Now write the reaction equation first;
2H₂ + O₂ → 2H₂O
Find the number of moles of Hydrogen gas;
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of H₂ = 2(1) = 2g/mol
Number of moles = [tex]\frac{4}{2}[/tex] = 2moles
From the balanced reaction equation;
2 moles of H₂ will produce 2 moles of H₂O
So, mass of H₂O produced;
Mass of H₂O = number of moles x molar mass
Molar mass of H₂O = 2(1) + 16 = 18g/mol
Mass of H₂O = 2 x 18 = 36g
We can see from the calculations that the use of 4g of hydrogen produces 36 g of water.
We know that water is produced from the equation;
2H2(g) + O2(g) ----> 2H2O(g)
Number of moles of hydrogen = 4 g/2 g/mol = 2 moles of hydrogen
From the reaction equation, we can see that 2 moles of hydrogen yields 2 moles of water.
Hence, If we use 4g of hydrogen, we end up with 2 moles of water.
Mass of water = 2 * 18 g/mol = 36 g
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A farmer has a bucket of fertilizer that will help her plants grow. She
followed instructions on the fertilizer bucket, which say to change the phase from a
liquid to a solid before adding it to the plants. What happened to the molecules of
fertilizer when it changed phase?
Explanation:
The molecules of the fertilizer after the phase change are more reactive compared to when in solid phase.
These molecules in liquid are more free to move about and not fixed as in a solid. This causes the liquid fertilizer to react faster compared to the solid. The solid molecules are in a fixed shape. In the liquids, they slide on top of one another and are free to move better.True or False-- Siblings (brothers and sisters) may or may not have the same combination of traits.
Answer:
True
Explanation:
Hope it helped. :)
Answer:
definitely true
Explanation:
everyone is different
Which of the following is important to gbellringer #13. Which of the following is important to generating heat?
A. Friction
B. Chemical reactions
C. Sunlight
D. All of the above
Answer:
D.) All of the above
Explanation:
Every answer is possible of creating heat.
* Good luck
What is the formula of phosphorus atoms and calcium atoms?
Answer:
Calcium phosphate chemical formula is given as Ca3(PO4)2.
Explanation:
Answer:
Calcium Phosphate is written as Ca3(PO4)2.
Explanation:
SOMEONE HELP ME PLEASEEEE!!!
What is the outermost layer of the Earth called?
Answer:
the outermost layer called Crust
This is Bohr's Model of:
A. Oxygen
B. Magnesium
C. Sulfur
Answer:
I think it's C
Explanation:
