Answer:
The coefficient of aluminum nitrate is 2.
Explanation:
The reaction between aluminum nitrate and calcium phosphite is:
Al(NO₃)₃ + CaHPO₃ → Al₂(HPO₃)₃ + Ca(NO₃)₂
Now, we need to balance the equation. Let's begin with phosphite anion. On the reactant side we have 1 molecule of the anion, and on the products side we have 3 of it, so we need to add a coefficient of 3 before CaHPO₃:
Al(NO₃)₃ + 3CaHPO₃ → Al₂(HPO₃)₃ + Ca(NO₃)₂
The number of Ca atoms on the reactants side is now 3 and on the products side is 1, so we need to add a coefficient of 3 as follows:
Al(NO₃)₃ + 3CaHPO₃ → Al₂(HPO₃)₃ + 3Ca(NO₃)₂
The reactants side has 1 atom of Al, and the products side has 2. Let's add a coefficient of 2 on the reactant side:
2Al(NO₃)₃ + 3CaHPO₃ → Al₂(HPO₃)₃ + 3Ca(NO₃)₂
Finally, the nitrate anion has 6 molecules on the reactant side, which is equal to the number of molecules of NO₃⁻ on the product side.
Hence, in the balanced equation, we have a coefficient of 2 in aluminum nitrate.
I hope it helps you!
What is the difference between phenol and dettol?
Write .. hot copper metal reacts with chlorine gas to form solid green copper chloride
in word equation
Answer:
Cu + Cl2 → CuCl
To happen the reaction, copper metal is heated.
Word equations are used to denote the chemical reaction in numbers and letters. The word equation between metal and gas is given as, copper + chlorine → copper chloride.
What is a word equation?Word equation is the representation of the chemical reaction by the use of letters, words, and numbers. It allows knowing the qualitative information of the reactants and products involved not reaction. It differs from the formula reaction as the latter involves the coefficients and the chemical symbols.
The word equation between a metal and a gas is given as:
copper + chlorine → copper chloride
This reaction involves copper metal that gets oxidized and chlorine gas that gets reduced to form copper(II) chloride.
Therefore, the word equation for copper metal and chlorine gas is, copper + chlorine → copper chloride.
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what is the molarity of a solution in which 6.9 moles of potassium chloride is dissolved in water to a final volume of 1.8 L?
Answer: 3.83
Explanation:
Answer:
3.83 :)
Explanation:
:)
SOMEONE PLEASE HELP ME ON THIS QUESTION ASAP!!! NO LINKS
Answer:
as for my answer is C.....
What does the word omniphobic mean?
Answer:
Special type of surface that repels liquid
Explanation:
One idea for avoiding a catastrophic collision of space debris with Earth is the use of missile-like projectiles to knock the object off course or deflect it. How can scientists be sure to create an impact with enough kinetic energy to change a meteoroid’s course? What factors should they consider? HELP :,)
At a certain temperature 3.24 moles of co2 gas at 2.15atm takes up a volume of 35.28 what is the temperature in celsius
Answer:
The temperature is 12.35 C.
Explanation:
An ideal gas is a theoretical gas that is considered to be composed of point particles that move randomly and do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.
An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of the gases:
P * V = n * R * T
In this case:
P= 2.15 atmV= 35.28 Ln= 3.24 molesR= 0.082 [tex]\frac{atm*L}{mol*K}[/tex]T= ?Replacing:
2.15 atm* 35.28 L= 3.24 moles* 0.082[tex]\frac{atm*L}{mol*K}[/tex] * T
Solving:
[tex]T=\frac{2.15 atm* 35.28 L}{3.24 moles* 0.082\frac{atm*L}{mol*K}}[/tex]
T=285.5 K= 12.35 C (being 273.15 K= 0 C)
The temperature is 12.35 C.
The relation between the moles, volume, temperature, and pressure is given by the ideal gas equation. The temperature of a gas is 12.35 celsius.
What is the ideal gas law?The ideal gas law is the hypothetical gas law that depicts the relation between pressure, volume, moles of the compound, and the temperature of the gas.
The ideal gas equation is given as,
[tex]\rm PV = nRT[/tex]
Given,
Pressure (P) = 2.15 atm
Volume (V) = 35.28 L
Number of moles (n) = 3.24 mol
Gas constant (R) = 0.082
Temperature (T) = ?
Substituting values in the above equation, the temperature is calculated as:
[tex]\begin{aligned} \rm T &= \rm \dfrac{PV}{nR}\\\\&= \dfrac{2.15\times 35.28}{3.24 \times 0.082}\\\\&= 286.23 \;\rm K\end{aligned}[/tex]
Therefore, 12.35 degrees Celsius is the temperature of the gas.
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please join me for dinner tonight.(write the sentence kind).give the right answer for this question
Answer:
Sentence type wish
The answer to the question: No.
Answer:
Will you join me for dinner tonight?
Explanation:
like and rate and brainiest plz
Who was one of the first scientists to realize the effects of CO2 in the atmosphere?
When did he do this?
How was it measured?
Where?
Answer:
Who: Svante Arrhenius.
When: Claimed in 1896 that fossil fuels has a negative effect on our atmosphere.
How: Svante Arrhenius proved that fossil fuels had a negative effect by calculating the output of buildings that emit fossil fuels, and lead to the conclusion by his calculations that the industry might one day bring global warming. Svante Arrhenius' theory of electrolytic dissociation and his model of the greenhouse effect also helped him to prove that his remarks about fossil fuels and global warming is true.
Where:
I cannot find any source that mentions the where. What do you mean by where?
I hope my other information help you. I apologies to only be able to answer partially.
The one of the first scientists to realize the effects of CO₂ in the atmosphere is Svante Arrhenius.
What do you mean by effect of CO₂?In this question effect mat be define the possitive impact or negative impact of carbon dioxide gas in the atmosphere.
Scientist Svante Arrhenius is the first one who realize the effects of CO₂ in the atmosphere.In the year 1896 he put his thought about CO₂.By measuring the output of buildings that emit fossil fuels, he established that fossil fuels have a negative influence, and his calculations led to the conclusion that the industry may one day cause global warming. Svante Arrhenius' electrolytic dissociation theory and greenhouse effect model also aided him in proving that his statements concerning fossil fuels and global warming are correct.Hence, Svante Arrhenius is one of the first scientists to realize the effects of CO₂ in the atmosphere.
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Mass = 200 g Volume = 20 cm3 What is the density?
Answer: 156
Explanation:
WILL GIVE BRAINLIST
In the Neighborhood
Ahn vigorously scrubbed windows, a tedious necessity for her family's new Vietnamese restaurant. They had turned the building from homely to gorgeous, but everything had to be absolutely perfect: unique decorations, skillful employees, and fabulous traditional food. Then customers would adore the place, making the business a success.
Ahn shifted her vision to look outside the restaurant as a girl about her age, with abundant red hair, strolled up the street. Ahn’s family had recently moved to this neighborhood, so she had few friends.
The girl paused to study the sign announcing their opening and then looked directly at Ahn with a friendly smile. Ahn smiled back shyly and lifted a hand, accidentally waving with the cleaning cloth. The girl laughed at her amusement and waved back in acknowledgment.
Ahn hesitated, not accustomed to initiating friendship, but she felt courageous, so on a whim she opened the door. "Hello," she said, adding the first thing that entered her head, "do you like Vietnamese food?"
"I don't know, but I like to try new things,” the girl remarked, and then she introduced herself as Gabriela.
Ahn could not think of additional conversation until she had a sudden idea. "Please wait here," she requested, "and I'll be right back." She ran into the adjoining kitchen and explained her idea to her father. He was sympathetic, so seconds later Ahn presented a small package to Gabriela. "Some Vietnamese candy for you to try,” she explained. “If you enjoy it, I hope you'll return to the restaurant sometime, or even visit after school when I'll be here preparing for the dinner service."
"Excellent, I'll see you around soon.” Gabriela headed down the street, glancing back with a cheerful wave. Ahn spent the remainder of the afternoon hoping Gabriela really would return and not think Ahn’s gift was weird.
The following day, Ahn assembled bouquets of artificial flowers, orchids that would never wilt. She was admiring her accomplishment when she heard unexpected tapping and turned to see Gabriela beckoning to her with a plate covered with transparent plastic wrap. Ahn grinned with enthusiasm and opened the door with a cordial greeting.
Gabriela presented the plate and said, "I brought biscuits made from my grandmother's recipe to thank you for the delicious candy.”
"Come in, and we can have some biscuits right now," Ahn stammered, happy inside.
Gabriela entered and rotated to scan the room with its picturesque landscape mural. "Thanks, they really are wonderful, and I'm fascinated to see your restaurant."
As they snacked on the treats, Ahn fumbled for conversation and considered an offer. "Are you good with vocabulary?” she inquired. "I intend to design a publicity pamphlet for the restaurant, and I could use some assistance."
"Certainly!" Gabriela said, adding, "I'm delighted you moved into the neighborhood and thrilled I have a new friend."
Ahn grinned, now positive that the restaurant would make a wondrous impression on the community, that customers would be plentiful, and that she was going to enjoy life here immensely
Write a brief summary of the passage you just read “In the Neighborhood”. (Use at least 4 sentences).
This story is about two girls beginning a friendship. What do they do to become friends? What are some examples from the text to support your answer? (Use at least 3 sentences).
Why do you think Ahn was nervous to make friends? (Use at least 2 sentences).
Have you ever done anything to make a friend with someone? How did it turn out? (Use at least 3 sentences).
Have you ever moved to a new place or started something new? Were you nervous? Did anyone help you? (Use at least 3 sentences).
no links please
Answer:
The restraunt was amess when it was first moved into, the girl there was not fimilliar with making friends but she racked up the courage to talk to the little girl who was comming in. They soon started to build on a friendshoip that started a littl rough. But they soon becaume good friends.
Well they are both around the same age and are girls and probably don't have muh experience with that.
She was nervous to make friends because she was not really accustomed to that.
Yes and good.
Explanation:
first time on here, using my frieds old account, sorry for the spelling im in a test. Hope this hellps
why does the atmosphere weigh so much
Answer:
Because the Earth's gravity acts on the atmosphere and holds it down, just as it does all other objects. The weight of the atmosphere is estimated to be about 5.75 quadrillion (5,750,000,000,000,000) tons. Air pressure is the "push" of the atmosphere on the Earth's surface.
what tools are used to predict blizzards
Answer:
someone people use Doppler radar
Explanation:
Which of the following is a true statement about odors?
A. All odors are made of particles.
B. Odors move in all directions.
C. Odors can be detected.
D. All of the above.
Which is not a chara
why a dipole develops in a molecule
Answer:
Dipole interactions occur when partial charge form within a molecule because of the uneven distribution of electrons.polar molecules align so that the positive end of one molecule interacts with the negative end of another molecule.
Answer: Uneven distribution of electrons in a
Molecule.
Explanation: Q. What’s the dipole-dipole interaction ?
SOL.-
CONCEPT-
Dipole-dipole Forces -
Intermolecular interactions are necessary for the stability of the molecule. There are many types of intermolecular forces, and dipole-dipole forces are part of these forces them.
Dipole-dipole forces, also known as dipole-dipole interactions. The electrostatic forces between two permanent polar molecules is known as dipole- dipole force. Generally, the positive side of one molecule is attracted to the negative side of another molecule. The two molecules come closer, and add for increasing the stability of the substance. This type of interaction is different from a regular ionic bond or a covalent bond because there is no transfer or sharing of electrons.
Causes of a Dipole-dipole Interaction-
Dipole-dipole interaction arises due to the unlike distribution of electrons in a molecule. The electrons are assembled at one end of the molecule. Thus, the molecule get a partially negative charge at one end and a partial positive charge at the another end. That process making them polar. Generally, two polar molecules with opposite nature charges will attract one another.
Diagram-
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Write the complete nuclear symbol for a nucleus of oxygen with 8 protons & 10 neutrons?
Answer: The complete nuclear symbol will be [tex]_8^{18}\textrm {O}[/tex]
Explanation:
The nuclear symbol is written as: [tex]_Z^A\textrm {X}[/tex] where Z= atomic number , A = mass number X = symbol of element
Atomic number is defined as the number of protons or number of electrons that are present in an atom.
For an electrically neutral atom,
Atomic number = Number of electrons = Number of protons = 8
Mass number is defined as the sum of number of protons and neutrons that are present in an atom.
Mass number = Number of protons + Number of neutrons
Mass number = 8 + 10 = 18
Thus complete symbol will be [tex]_8^{18}\textrm {O}[/tex]
You are given three liquids. You know that one of them is a suspension, one is a solution with nonelectrolytes, and the other is a solution with electrolytes. Describe the process by which you would differentiate between the three.
Answer:
decant/ filter then decompose the electrolytes by electrolysis
Explanation:
Differentiation of suspension solution is done by filtering and differentiation of electrolyte and non-electrolyte solution is done by electrolysis process.
What is electrolysis process?Electrolysis process is used to decompose the any electrolyte present in any solution into their constitute ions towards the cathodes and anodes under the electric flow of current.
Process which is required to differentiate suspension solution is filtering, because in this solution suspended insoluble particles are present which get filtered. Now to differentiate between non electrolyte and electrolyte solution we will use the electrolysis process, as non electrolyte solution do not show any behavior in this.
Hence, we use filtering and electrolysis process for the differentiation.
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can someone help with this???
Answer:
2Mg(s) +O₂(g) → 2MgO(s)
Explanation:
Mg(s) +O₂(g) → MgO(s)
When a chemical equation is balanced, the number of atoms of each element is equal on both sides of the arrow. We usually balance O and H last.
In this case, the number of Mg atoms is equal on both sides. Thus, let's move on to balance the O atoms. On the left side, there are 2 O atoms, while there is only 1 O atom on the left side. Thus, write a '2' in front of MgO.
Mg(s) +O₂(g) → 2MgO(s)
Now, the number of Mg atoms is not equal. Write a '2' in front of Mg to balance it.
2Mg(s) +O₂(g) → 2MgO(s)
The equation is now balanced with 2 Mg atoms and 2 O atoms on each side.
I need help asappp I give the best answer Brainliest
Hey there, leairastrong!!
The endocrine system's role is to send out chemical messages so as to regulate bodily activities. It determines how and when you grow, when you hit puberty and how much your body changes, and even what mood you're feeling right now.
I really hope this helps!! :)
I’m completely lost on these stoichiometry problems
Answer:
1) 4.21 x 10^24 molecules of Fe2O3
2) 36.416g of O2
Explanation:
1) First, find moles of Fe2O3 by using the mole ratio of 3:2. Fe2O3 has a coefficient of 2, and O2 has a coefficient of 3 thus making their mole ratio 2:3. Then, multiply 10.5 moles of O2 by 2/3 which equals 7 moles of Fe2O3. Finally, convert moles of Fe2O3 to molecules by multiplying it by Avogadro's number.
10.5 mol x 2/3= 7 mol Fe2O3
7 mol multiplied by 6.02 x 10^23 = 4.21 x 10^24 molecules
2) First, convert grams of KClO3 to moles by dividing it by its molar mass(approximately 122.5 g), which equals .759 mol. Then find moles of O2 by multiplying .759 mol KClO3 by the mole ratio of O2 to KClO3, which is 3:2. That equals 1.138 moles of O2. Finally, convert moles to grams by multiplying 1.138 mol by the molar mass of O2 (approximately 32g). 36.416g of O2 is your final answer.
93g KClO3/ 122.5g = .759 mol KClO3
.759 mol x 3/2= 1.138 mol O2
1.138 mol x 32g= 36.416g O2
Answer:
See Explanations ... I'll have to deliver my explanation in two posts. One is beyond the limits allowed.
Explanation:
Stoichiometry is very easy if you understand the relationship between the 'mole' and the balanced chemical equation. Let's start by defining the 'mole'
The 'mole' of substance is the mass of substance (element or compounds) that contains 1 Avogadro's Number ( = 6.02 x 10²³ ) of particles. The mass of substance that does contain 1 Avogadro's Number of particles is 1 formula weight of substance (also, molecular weight of substance). That is,
1 mole = 1 formula wt. = 1 mole weight = 1 Avogadro's Number = 6.02 x 10²³ particles of substance.
So, assuming you can determine formula weight then that value expressed in terms of grams is a 'Gram Formula Weight'; that is, 1 GFW = 1 mole wt.
At this point it is assumed that you understand how to balance simple chemical equations by inspection. That is, by the Law of Mass Balance ...
total mass of reactants = total mass of products
In problem 1 you are given iron (Fe) + molecular oxygen (O₂) => iron(III) oxide (Fe₂O₃) ... 4Fe + 3O₂ => 2Fe₂O₃ ... ∑mass R = ∑mass P.
Now, focus on the coefficients of each substance, that is, 4 for Fe, 3 for O₂ and 2 for Fe₂O₃. These values (coefficients) are moles of each substance in a special type of equation called the 'Standard Equation'. The Standard Equation is one which when balanced its coefficients are in the smallest whole number mole ratio of substance. That is the equation above is showing 4 moles of Fe, 3 moles of O₂ and 2 moles of Fe₂O₃. This is important in that most balanced equations that will be given in textbook problems will be in Standard Form.
From the Standard Form, the coefficients can be doubled, or divided in half, or whatever multiple or fraction one desires. The reaction would still perform in correct proportions. However, the multiples or fractions would not be in Standard Form. Most, if not all, stoichiometry problems will provide only the Standard Form.
Example, let's take the given equation above (from problem 1)
4Fe + 3O₂ => 2Fe₂O₃.
Both of the following are in correct proportions and will react with respect to the proportions YOU choose ...
(multiply by 2) => 8Fe + 6O₂ => 4Fe₂O₃.
(dividing by 2) => 2Fe + 3/2O₂ => Fe₂O₃.
Both are balanced and conform to the Law of Mass Balance but are not in Standard Form. Oh, and the Standard Form equations are assumed to be at 0°C and 1 atm, even if not specified in the problem. You may not need that now, but will become important in Gas Laws.
Let's move on to stoichiometry calculations. There are several methods being taught within the chemed. community, but I'm going to focus only on using mole ratios.
My approach begins with this rule => convert reaction data to moles, solve using mole ratios and convert to needed dimension at the end of the problem. This will simplify a lot of problems once you understand what it's about.
OK, for problem 1 ...
How many molecules of Fe₂O₃ can be produced from 10.5 moles of O₂?
Given the Standard Form equation 4Fe + 3O₂ => 2Fe₂O₃.
Now, write (neatly) the equation and list the givens under the specific substances ...
4Fe + 3O₂ => 2Fe₂O₃.
ex* 10.5 moles ? molecules note: ex* = excess (not used)
In this problem, since O₂ is already in terms of moles no conversion needed.
What you need to focus on is the relationship between the coefficients of O₂ and Fe₂O₃. Note that the coefficient of Fe₂O₃ is SMALLER than the coefficient of O₂. This means that the number of moles of Fe₂O₃ formed will be smaller than moles of O₂ given, that is 10.5 moles. How much smaller? Easy Calculation => Take the coefficient of O₂ and the coefficient of Fe₂O₃ and make a ratio of the numbers that will make 10.5 SMALLER. That is, you should use 2/3(10.5) to get a smaller number, not 3/2(10.5) because that would give a larger number and inconsistent with the ratio given in the balanced equation.
So, moles of Fe₂O₃ produced = 2/3(10.5) moles Fe₂O₃ = 7 moles Fe₂O₃. Note that 7 moles is smaller than 10.5 moles.
Now, the number of molecules of Fe₂O₃ is also an easy calculation.
Remember that 1 mole contains 6.02 x 10²³ particles, then 7 moles would contain ...
= 7 moles Fe₂O₃ x 6.02 x 10²³ molecules Fe₂O₃/mole Fe₂O₃
= 4.21 x 10²⁴ molecules Fe₂O₃.
Go to 2nd post for problem 2 solution.
Which of the following best explain how Earth's rotation relates to living systems?
A. Earth’s rotation severely limits the amount of sunlight hitting a given region, which prevents living systems from surviving
B. By stabilizing temperatures for a given region, earth’s rotation helps sustain living systems in that region
C. Earth’s rotation forces many animals to migrate in order to continuously receive the Sun’s rays
D. Because Earth’s rotation brings darkness to a given region, plants are unable to survive in that region at night
Answer:
I think it's B
But A seems a good answer too
It might be D
But Imma go for C
Explanation:
3. Universal indicator is used to
determine the pH of a solution. Which
statement is correct?
A. Universal indicator turns red in
strong alkali.
B. Universal indicator turns blue in
strong acid.
C. Universal indicator turns orange in
weak acid.
Answer:
C.Universal indicator turns orange in
weak acid.
Explanation:
option A and B are incorrect coz universal indicator turns red in strong acid and in strong alkali (base) it turns blue
How many grams is 2.393 x 10^24 atoms of CI
70.45 g CI
140.9 ga
140.9 mole CI
70.45 mole CI
How many grams is 2.393 x 10^24 atoms of O
70.45 g O
140.9 g O
63.58 mole O
63.58 g O
Answer: 1. 140.9 g Cl
2. 63.58 g O
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given atoms}}{\text {avogadro's number}}[/tex]
1. [tex]\text{Number of moles of Cl}==\frac{2.393\times 10^{24}}{6.023\times 10^{23}}=3.973moles[/tex]
1 mol of Cl weighs = 35.5 g
Thus 3.973 mol of Cl weighs = [tex]\frac{35.5}{1}\times 3.973=140.9g[/tex]
2. [tex]\text{Number of moles of O}==\frac{2.393\times 10^{24}}{6.023\times 10^{23}}=3.973moles[/tex]
1 mol of O weighs = 16 g
Thus 3.973 mol of O weighs = [tex]\frac{16}{1}\times 3.973=63.58g[/tex]
What is the H+ ion concentration of a solution with a pH of 7?
Answer:
10-7mol/l
Explanation:
Answer: 10-7mol/l
Explanation:
BRAINS
If 3.0 moles of a gas are in a 60.0 liters container at 400.0 K, what is the pressure, in atm, inside
the container?
A.
0.61 atm
B.
16 atm
C.
1.6 atm
Answer:
C. 1.6 atm
Explanation:
PV = nRT
Solve for P --> P = nRT/V
n = 3.0 mol
R = 0.08206 L atm / mol K
T = 400.0 K
V = 60.0 L
P = (3.0)(0.08206)(400.0) / (60.0) = 1.6 atm
The maps show that northern areas should get
Answer:
We might need more information too answer that question...
Explanation:
Try Inserting A picture ️ :)
I’ll give the brainliest
What will happen to buildings, statues and canyons where water flows through them over many years?
Answer:
Water gradually degrades them until the metal parts rust and the other materials deteriorate.
Explanation:
Why is it necessary to know the temperature of the reactants and the products of a reaction in order to determine change in the Gibbs free energy of the reaction
Answer:
Free Energy (G) can either increase or decrease for a reaction when the temperature increases. It depends on the entropy (S) change. The change in a quantity is represented by the Greek letter delta. ... Hence, when the temperature increases the numeric value of the free energy becomes larger.
Explanation:
The change in Gibbs free energy (ΔG) of a chemical reaction depends on the initial and final states of the reactants and products, as well as on the temperature and pressure conditions of the reaction.
What is Gibb's free energy?The Gibbs free energy of a reaction tells us whether a reaction is spontaneous or not under given conditions, with negative ΔG values indicating a spontaneous reaction and positive ΔG values indicating a non-spontaneous reaction.
The temperature of the reactants and products is important in determining the Gibbs free energy change because the Gibbs free energy change is related to the enthalpy change (ΔH) and the entropy change (ΔS) of the reaction through the equation:
ΔG = ΔH - TΔS
where T is the temperature in Kelvin.
Thus, the temperature of the reactants and products must be known in order to calculate the Gibbs free energy change of a reaction accurately.
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Which layer of the sun is shown extending into space in the picture above?
Answer:
Corona
Explanation:
The outermost layer of the sun's atmosphere is called the corona, meaning “crown.” The corona is formed of thin wisps of gas that extend outward into space for millions of miles. It is much less bright than the photosphere, so we can only see it if the rest of the sun is blotted out, for example during a solar eclipse.
How do the mass number and atomic change as a particle goes through beta decay
Answer:
The atomic mass number does not change because a beta particle has a much smaller mass than an atom. The atomic number goes up because a neutron has turned into an extra proton, however in beta decay a fast-moving electron is fired out of the nucleolus
Hope this helped!