Answer: If an Atom has 12 Electrons then if it is a Neutral atom then the Atomic Number of the Atom will be 12.
The Electronic Configuration of Element with Atomic Number 12 will be :
⇒ 1s² 2s² 2p⁶ 3s²
We can notice from the Electronic Configuration that :
Given atom has 2 electrons in the 1st shell.
⇒ In the Shell : n = 1
Number of Electrons = 2
In the similar way : Number of Electrons in 2nd shell = 2 + 6 = 8
⇒ In the Shell : n = 2
Number of Electrons = 8
In the similar way : Number of Electrons in 3rd shell = 2
⇒ In the Shell : n = 3
Number of Electrons = 2
Explanation:
When an electron starts in the n=4 shell of a neutral hydrogen atom and once it has fallen to the n=1 shell, then 3 photons will be emitted.
What is emission of energy?If any electron is presnt in the highest energy shell of an excited atom and when comes back to the ground state then emission of energy takes place.
As we know that by the absorption of one photon, electron will goes on the succeding shell from the previous shell. Similarly when electron come back to the 3rd shell from the 4th shell of a hydrogen atom then 1 photon will emit, from 3rd to 2nd shell 2nd photon will emit and from 2nd to 1st shell 3rd photon will emit.
Hence 3 photons will be emitted once electron will fall into 1st shell from the 4th shell.
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1. Answer the
C.
i. Addition reaction
111. Displacement reaction.
i i ti on
a What is a chemical reaction? Mention its types.
b. Explain the following types of chemical reaction with one example
ii. Decomposition reaction
c. What are the conditions required for the decomposition reaction to
d. What is acid-base reaction? Why is it also called neutralization re
e. What is the chemical reaction in which the exchange of electrop
electronegative ions occurs in aqueous solution? Write one example
f, Explain why the double displacement reaction is also called
. What is the state of reactant and products like in the double decomposition
h. How does the application of heat increase the rate of a chemical reaction
i. What is the effect of the surface area of reactants on the rate of chemical:
In
и
with examples.
a.
b. Ammo
Alumit
d. Coppe
e.
Magne
Calciu
g
Silver
h. Sulph
What happer
i. red m
iii. phos
V.
silve
vi. amm
vii. wate
ix. pota
X. carb
xii. lime
decomposition reaction.
ai
is
с
Multi
Explain with examples.
i What is a catalyst? Write its type with examples.
k. Differentiate between
1. Positive catalyst and negative catalyst.
ii. Exothermic reaction and endothermic reaction.
2. Complete the following reactions and also mention their types.
i. Mg+
MgSO4+H
A
Caco, +
A
1. The pro
U
ii. Ca (HCO3)2
iii. MgCO,
a. Balar
c. Word
2. The che
is calle
Answer:
Explained below
Explanation:
In a decomposition reaction, a substance (commonly a molecule) descomposes in the elements that originally formed it.
The standard formula is:
AB > A + B
In fact, is the opposite of a synthesis reaction.
An example of decomposition reaction is:
H2O > 2H + O
i need a person i can love and not get hurt
Answer:
You'll find someone. There's a someone for everyone.
Explanation:
And I know how you feel.
What does electronegativity measure
Which is NOT an example of an inclined plane?
Question 4 options:
A See-Saw
A screw
A slide
A ramp
Answer:
A. See-Saw
Explanation:
A see-saw is not an inclined plane but it is a lever.
A screw, ramp and a slide are all inclined planes
Simple machines help to make doing work easier. They simply help to amplify effort.
There are different types of simple machines;
the wheel and axle, the lever, the inclined plane, the pulley,d the screw, and the wedge.An inclined plane is a simple machine made up of a plane fixed at one end and then tilted at the other.
If you could change one thing about distance learning, what would it be?
Answer:
Nothing
Explanation:
BECAUSE DONT ASK
the correct electron-dot formula for a molecule of chlorine?
Answer:
Cl has 7 dots
if its Cl2; Cl-Cl it will contain 14 dots
Explanation:
The electron-dot formula of the chlorine molecule Cl₂is shown in the attached diagram below.
What is the lewis electron dot diagram?A lewis electron dot structure is used to represent the number of bonds, the bonding atoms, and the lone pairs left in the atoms in the molecule.
Lines are shown between atoms that are bonded to one another and excess electrons or lone pairs are represented as dot pairs and are placed next to the atoms.
As the valence electrons of each chlorine atom are equal to seven from the electronic configuration of the chlorine atom.
First, the total number of valence electrons in a chlorine molecule is 7 + 7 = 14.
As each chlorine atom needs only one electron to complete its octet. As the octet completes, the rest of the electrons are assigned as the lone pairs of atoms. Therefore, each chlorine atom has three lone pairs of electrons on it.
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The relationship between Fahrenheit and Celsius is as follows: °F = °C * 1.8 + 32 If the weather forecaster says it will be 14 °F, what is that in Celsius?
Answer:
The answer is "-10° C".
Explanation:
Fahrenheit and Celsius, both use scales for measuring their temperature standard. The Fahrenheit suggests, as just a cold water point by taking 32° F and hot water rate by taking 212° F. The freezing temperature of both the water at the Celsius scale is 0° C, as well as the boiling point of its water at 100° C.
Converting the Fahrenheit to Celsius:
Formula: [tex]\bold{^{\circ}F = ^{\circ}C \times 1.8 + 32}[/tex]
°F= 14
[tex]\to 14 = ^{\circ}C \times 1.8 + 32}\\\\\to 14 -32 = ^{\circ}C \times 1.8 \\\\\to -18 = ^{\circ}C \times 1.8 \\\\\to ^{\circ}C = \frac{-18}{1.8} \\\\\to ^{\circ}C = \frac{-180}{18} \\\\\to ^{\circ}C = - 10[/tex]
Which of the following is NOT a true statement?
The amount of solar radiation emitted by the Sun varies during different Earth
seasons. UV rays are blocked by Earth’s ozone layer.
The top several meters of the ocean is the greatest absorber of solar radiation on Earth.
Snow has a greater albedo than a rain forest.
Answer:
The amount of solar radiation emitted by the Sun varies during different Earth seasons
Explanation:
A 15.0 L tank of gas contained at a high pressure of 8.20 • 10^4 torr. The tank is opened and the gas expands into an empty chamber with a volume of 600•10^4 L. Calculate the new pressure of the gas
Answer:
P₂ = 0.205torr
Explanation:
Boyle's law relates the pressure and volume of a gas under two different conditions. The equation is:
P₁V₁ = P₂V₂
Where P is pressure and V volume of of 1, initial conditions and 2, final conditions.
P₂ is our incognite
Replacing:
P₁V₁ = P₂V₂
8.20x10⁴torr*15.0L = P₂*600x10⁴L
P₂ = 0.205torr
What is the voltage of an electrolytic cell with zinc and aluminum electrodes?
O A. -2.44 V
B. -0.92 V
C. 2.44 V
O D. 0.92 V
From the calculation, the voltage of the electrolytic cell is -0.92 V
What is an electrolytic cell?An electrolytic cell is is cell that produces energy by a nonspontaneous chemical process. The anode of this cell is zinc while the cathode is aluminum.
The voltage of the cell is obtained from Ecathode - E anode = -1.66 V - (-0.74 V) = -0.92 V
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What is the difference between magnetic stripping and magnetic field reversal?
What determines the number of protons in an element?
Describe 1 way process or system that transfers heat by convection. Be specific in details
You place 12.0 milliliters of water in a graduated cylinder. Then you add 15.0 grams of metal to the water and the new water level is 13.91 milliliters. What is the density of the metal in grams per milliliter?
Answer:
The answer is 7.85 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
volume = final volume of water - initial volume of water
volume = 13.91 - 12 = 1.91 mL
We have
[tex]density = \frac{15}{1.91} \\ = 7.853403141...[/tex]
We have the final answer as
7.85 g/mLHope this helps you
Answer:
Hello, Im Mack :)
Here is the Correct Solution for your question:
Answer is 7.85 g/mL
Explanation:
The density of a substance can be found by using the formula
-volume = final volume of water - initial volume of water
-volume = 13.91 - 12 = 1.91 mL
-Final Answer is: 7.85 g/mL
Hope this helped you out :)
Comment if you need further help, and I'll reply asap.
Have a great day my friend\ and best of luck to your studies :)
A steel cylinder for scuba diving contains 11.1 L of compressed air. The pressure inside the cylinder is
204 atm at a temperature of 24°C.
Calculate the number of moles of air in the cylinder.
Write your answer using three significant figures.
mol air
Answer:
9.28moles
Explanation:
Given parameters:
volume = 11.1L
pressure = 204atm
temperature = 24°C = 24 + 273 = 297K
Unknown:
Number of moles of air in the cylinder = ?
Solution:
To solve this problem, we apply the ideal gas equation;
PV = nRT
P is the pressure
V is the volume
n is the number of moles
R is the gas constant = 0.082atmdm³mol⁻¹K⁻¹
T is the temperature
Now insert the parameters and find n;
204 x 11.1 = n x 0.082 x 297
226.4 = 24.4n
n = 9.28moles
The number of moles of air in the cylinder is 92.98 moles
From the following parameters given, we are to determine the number of moles of air in the cylinder.
Given that:
The volume of the steel cylinder = 11.1 LThe pressure inside the cylinder = 204 atmThe temperature inside the cylinder = 24°CThe number of moles of air can be determined by using the relation for the ideal gas equation which can be expressed as:
PV = nRTwhere
n = number of molesMaking (n) the subject of the formula:
[tex]\mathbf{n = \dfrac{PV}{RT}}[/tex]
[tex]\mathbf{n = \dfrac{204 \ atm \times 11.1 L}{0.082 \ L .atm/mol .K \times 297 \ K}}[/tex]
n = 92.98 moles
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Discuss the molecules in solids, liquids and gases. Include how the molecules move, including the speed of the molecules and the
space between the molecules.
Answer:
Molecules in solids are tightly packed because the atoms are freezed together. Molecules in liquids are loosely packed because atoms are broken down and can move anywhere. Molecules in gases are free; the atoms can move or spread anywhere.
Solids do not move; hence no speed.
Liquids move and slide past past each other.
Gases move freely at high speeds
1) What is the ground state electron configuration for Oxygen (O)?
2) What is the excited state electron configuration for Oxygen (O)
Help please
Answer:
1)Oxygen atoms have 8 electrons and the shell structure is 2.6. The ground state electron configuration of ground state gaseous neutral oxygen is [He]. 2s2. 2p4 and the term symbol is 3P2.
Explanation:
2)If the element were to become excited, the electron could occupy an infinite number of orbitals. However, in most texts the example will be the next available one. So for oxygen, it might look like this: 1s22s22p33s1 - where the valence electron now occupies the 3s orbital in an excited (i.e. not ground) state
How many elements are found in the following chemical equation? K + Cl → KCl
Answer:
2
Explanation:
If an object has a density of 0.2g/ml, will it sink or float in water?
Sink
Float
Answer:
float ...(i think)
Explanation:
is the kinetic energy due to the random motion of particles in an object
Answer:
You are correct however there is also potential energy because the energy is released over a period of time.
Hope this helps!
the energy level of the valence electrons in Nitrogen
Answer:
NITROGENValency = 3Atomic number = 7Electronic configuration consist
K = 2 , L = 5on the basis of sub shell
1s^2 , 2s^2 , 2p^3Which group of organisms disappeared during the mass extinction at the end of the Cretaceous Period?
A. dinosaurs
B. mammoths
C. saber tooth cats
D. trilobites
Answer:
saber tooth cats
Explanation:
(02.02 LC)
Which of the following is an example of chemical weathering?
Frost wedging
O Animal activity
Plant growth
O Acid rain
Answer: acid rain
Explanation: Acid rain is one way in which rocks can be chemically weathered. It can harm forests and crops, damage bodies of water, and contribute to the damage of statues and buildings. In this activity you will simulate the chemical weathering of limestone, which is a soft, sedimentary rock that reacts easily to acid rain.
where in texas are you most likely to find hoodoos ?
coastal plain
mountains and basins
great plains
north central plains
It's important to remember that elements are
No, unless you're doing some sort of course where they demand that you do. It's useful to remember the general features of the periodic table (what each block is, where they are in relation to each other, roughly where the most common elements are), but memorizing the entire thing would simply be a mnemonic exercise
Hope this helped
Answer:
i used a vent to vented
Explanation:
Please help!
An astronaut orbits planet X in his spaceship. To remain in orbit at 675 km above the planet's center, he maintains a speed of 76 m/s. What is the
mass of planet X? Note: the constant of universal gravity (G) equals 6.674 X 10 ^-11 N m^2/kg^2.
A. 7.7 x 10^14 kg
B. 5.8 x 10^19 kg
C. 7.7 x 10^17 kg
D. 5.8 x 10^16 kg
Answer:
B. 5.8 × 10^19 kg
Explanation:
1) Which of the following is NOT a step in the scientific method *
Formulating a scientific question
Making Observations
Developing a hypothesis
Applying for a license
Answer:
applying for a license
Answer:
Applying for a license
Explanation:
This is because you have to have observations,hypothesis and a scientific equation when using The Scientific Method.
Maceo is making rock candy. Which best describes the steps she should take? heat a saturated sugar water solution, dissolve more sugar, then let the solution cool heat a saturated sugar water solution, dissolve more sugar, and wait until the water evaporates saturate a water solution, increase the pressure, and dissolve more sugar saturate a water solution, lower the pressure, and dissolve more sugar
Answer:
(A) is the answer
Explanation:
(A) heat a saturated sugar water solution, dissolve more sugar, then let the solution cool
Answer:
the answer is a
Explanation:
im on edg rn
True or false : An ion is a substance in which the atoms of two or more elements are combined in a fixed proportion
Answer:
The answer would be "True"
Describe in two-five-sentence paragraphs the characteristics a substance must have to be
considered a mineral.
Answer:
A Mineral can be identified if they have the following properties:
1) Naturally occurring: it should be present in nature on its own, steel is not a mineral because it is made manually.
2) Inorganic it should not be produced by any organism
3) Solid It should not be in liquid or gaseous state, water is not a mineral because its liquid.
4) Definite chemical composition it should have a limited variation in its chemical properties.
5) Ordered internal structure it should have definite internal repeating structure that does not varies much.