a single 3s electron in a magnesium atom is shielded by
a) the 2s and the 2p electrons only
b) the 1s, 2s, and 2p electrons, along with the other 3s electron
c) the 1s, 2s, and 2p electrons
d) the 1s and 2s electrons only
Answer:
D
Explanation:
because the answer is D
The characteristics of the shielding we can find the correct answer for the shielding of a magnesium electron is:
c) The 1s, 2s, and 2p electrons
The quantum mechanic shielding is the effect that the electrons closest to the atomic nucleus have to create a potential barrier for the electrons of the higher orbits.
The net attractive force on the electron of Magnesium is diminished by the effect of the electrons in the lower shells n = 1 and n = 2
As the level n = 2 is closer to the level n = 3 this is the one that creates the greatest shielding, but the innermost level also contributes a part.
The other electron at the same energy level n = 3, has an effect due to the Pauli exclusion principle, it forces it to have an opposite spin, to be able to be together, creating an exchange energy between the two electrons, but it does not shield the core charge as they are together.
Let's examine the different claims
a) False. Electrons at level n = 1 also create shielding
b) False. Electrons at levels n = 1 and n=2 create a shield, but the other electron is at the same level n = 3 and does not shield the nucleus.
c) True. The internal levels serves as a screen for the electron each with a different magnitude
d) False. The 2p orbital creates a large shield since it has 6 electrons
In conclusion, using the characteristics of the shielding we can find the correct answer for the shielding of a magnesium electron is:
c) The 1s, 2s, and 2p electrons
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A gas has a pressure of 0.12 atm at 294 K. What is the new pressure at 273 K?
Answer:
P₂ = 0.11 atm
Explanation:
Given data:
Initial pressure = 0.12 atm
Initial temperature = 294 K
Final pressure = ?
Final temperature = 273 K
Solution:
According to Gay-Lussac Law,
The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.
Mathematical relationship:
P₁/T₁ = P₂/T₂
Now we will put the values in formula:
0.12 atm / 294 K = P₂/273 K
P₂ = 0.12 atm × 273 K / 294 K
P₂ = 32.76 atm. K /294 K
P₂ = 0.11 atm
The direction of movement of the cold front shown in the figure at left is _____.
northeast
southeast
southwest
northwest
Answer:
Its southeast
Explanation:
Answer:
southeastt
Explanation:
Compare The atomic number
of potassium is 19. How does
potassium-39 differ from
potassium-41?
Answer:
They are different ions of the same element.
Explanation:
on Quizlet
1 what do you understand by the term isotopes 2 why do I should talk of an element process identical chemical properties 3 name the isotopes of Hydrogen which does not have a Newton in it
Answer:
Isotopes of an element have same number of protons but different number of neutrons. Which means isotopes of an element have same atomic number but different mass number.
The chemical property of an element is determined by the number of electrons. And as all the isotopes have same number of electrons, they have same chemical properties.
Thus as isotopes of an element have same atomic number , they have same number of electrons and protons. As they have different mass number, the number of neutrons will be different. Hydrogen has three isotopes , [tex]^1_1\textrm{H}[/tex], [tex]^2_1\textrm{H}[/tex] and [tex]^3_1\textrm{H}[/tex]. Thus [tex]^1_1\textrm{H}[/tex] has no neutron.
If 4 moles of O2 and 8 moles of N2 occupy a 12 L
container at a pressure of 6 atm, what is the partial
pressure of N2?
Answer:
P(N₂) = 4.02 atm
Explanation:
Number of moles of O₂ = 4 mol
Number of moles of N₂ = 8 mol
Total pressure = 6 atm
Partial pressure of N₂ = ?
Solution:
We will calculate the partial pressure by using mole friction.
P(N₂) = X(N₂)P(total)
X(N₂) = mol friction = moles of N₂ / total number of moles
X(N₂) = 8 mol / 12 mol = 0.67
Partial pressure of N₂:
P(N₂) = X(N₂)P(total)
P(N₂) = 0.67 × 6 atm
P(N₂) = 4.02 atm
How many atoms in 4.5 moles of carbon (C)?
Answer:
34 atoms
Explanation:
Help please! I'll give brainliest to the most helpful answer :)
Answer:
synthesis d
Explanation:
did that at my school
Pls help! I'll give brainliest!
Draw a physical model that shows the reaction of zinc metal and hydrochloric acid (hydrogen chloride).
Zinc + Hydrochloric Acid → Zinc Chloride and Hydrogen Gas
Zn + 2HCl → ZnCl2 + H2
Be sure to label your model to clearly show how you are representing the atoms, how they are rearranged and that mass is conserved in the reaction.
I don't need it drawn, if you can just explain to me the reaction and what happens i can draw it. Please?
Answer:
sorry im not sure
Explanation:
a
Is Cellular Respiration a carbon sink or source???
Answer: Carbon source
1. The forks shown are made of silver (Ag). Some of the silver forks
shown have lost their luster—they have become tarnished. This is an
example of Type here.
Answer:
Corrosion
Explanation:
Silver, although known as a nobble metal, is also subject to corrosion process such as having silver tarnish when exposed to sulfur and air.
Tarnishing occurs on the surfaces of some metals such as brass, copper, and silver, which results in a corroded layer. Silver tarnish occurs from the chemical reaction that takes place when silver is exposed to sulfur which results in the formation of black Ag₂S
In order to restore the original silver surface, the silver tarnish (silver sulfide) layer is removed.
We have the statement presented here as follows;
The forks shown are made of silver (Ag). Some of the silver forks shown have lost their luster - they have become tarnished. This is an example of Corrosion.
What is most likely an immediate consequence of drought?
Answer:
A lack of rain or the location is experiencing a dry season
Explanation:
A student has one mole of zinc and one mole of oxygen. Which of the following is true for both samples? *
There are equal masses of zinc and oxygen
There are equal numbers of atoms of zinc and oxygen
There are equal volumes of zinc and oxygen
There are equal densities of zinc and oxygen
Answer:
2
Explanation:
A solar heating specialist is considering paraffin (Cp = 2.90 J/g O C) as a storage material for heat. How many kg of paraffin would be needed to collect the amount of energy as 4.73 x 10 3 kg of water?
Answer:
Mass of paraffin that would be needed to collect the amount of energy as 4.73 x 10³ kg of water is 6.85 * 10³ kg
Explanation:
Specific heat capacity of paraffin, Cp = 2.90 J/g.°C = 2900 J/kg.°C
Specific heat capacity of water = 4.20 J/g.°C = 4200 J/kg.°C
Amount of heat energy that can be stored by 4.73 * 10³ kg of water heated through a degree rise in temperature can be calculated as below:
Using H = mCpθ where m is mass of substance, Cp is specific heat capacity and θ is temperature change
H = 4.73 * 10³ kg * 4200 J/kg.°C * 1°C
H = 19866000 J
Mass of paraffin that would be needed to collect the amount of energy as 4.73 x 10 3 kg of water for a degree rise in temperature is calculated as follows:
H = mCpθ
19866000J = m * 2900 J/kg.°C * 1°C
m = 19866000J / 2900 J/kg
m = 6850.34 kg = 6.85 * 10³ kg
Therefore, mass of paraffin that would be needed to collect the amount of energy as 4.73 x 10³ kg of water is 6.85 * 10³ kg
How many moles of salt will you be using in this recipe?
which type of radiation is blocked by wood?
Answer:
Beta Particals
Explanation:
Beta particles are lighter than alpha particles, and they have a greater ability to penetrate other materials. A thin sheet of metal or plastic or a block of wood can stop beta particles.
How do you balance Sb+I2=SbI3 show work please
Answer:
2Sb + 3I₂ → 2SbI₃
Explanation:
The reaction expression we need to balance is:
Sb + I₂ → SbI₃
To balance this expression, we need to assign the variables a,b and c to each specie as the coefficient that will balance the expression.
aSb + bI₂ → cSbI₃
Conserving Sb : a = c
I : 2b = 3c
let a = 1, c = 1, b = [tex]\frac{3}{2}[/tex]
Multiply through by 2;
a = 2, b = 3 and c = 2
2Sb + 3I₂ → 2SbI₃
Select the correct answer.
Which of these is always equal to the molar mass of any element?
ΟΑ. .
its atomic number
OB.
its atomic weight
OC.
its atomic formula
OD.
its atomic structure
Reset
Next
Answer:
its atomic weight
Explanation:
Gasone provides the energy that powers many car engines. In an engine, gasoline and oxygen are mixed together and burned, creating carbon dioxide gas and water vapor. This process releases energy that the engine uses to turn the wheels, making the car move. Complete the sentence.
Answer:
In the forward direction and releases carbondioxide gas from backside.
Explanation:
In the forward direction and the carbondioxide gas which is a waste material is removed from the engine at the back. The chemical energy of fuel is converted into mechanical energy with the help of engine which able the car to move in the forward direction so engine is the key component that is responsible for the movement of car.
Answer:
In the forward direction and releases carbondioxide gas from backside.
Explanation:
The state of matter with the slowest moving atoms is _
A: plasma
B: liquid
C: solid
D: gas
The state of matter with the slowest moving atoms is solid. The correct answer is option C.
State of matter refers to the physical form that matter can exist in, such as solid, liquid, gas, and plasma.
In a solid, the particles are closely packed together and have a fixed position in a crystal lattice structure. The intermolecular forces between the particles are strong, which causes them to vibrate in place.
The particles in a solid have the lowest amount of kinetic energy compared to the other states of matter, which means they move the slowest.Therefore, the slowest moving atoms are found in the solid state of matter. Option C is the correct answer.
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How many electrons can be present in an atom having three principal
energy levels? *
Answer:
18 electrons
Explanation:
The third principal energy level has one s orbital, three p orbitals, and five d orbitals, which can each hold up to 10 electrons. This allows for a maximum of 18 electrons. The fourth and higher levels have an f sublevel in addition to the s, p, and d orbitals.
Answer:
18 electrons
Explanation:
The five d orbitals can hold up to 10 electrons. Thus, the third level holds a maximum of 18 electrons: 2 in the s orbital, 6 in the three p orbitals, and 10 in the five d orbitals.
Calculate the second volumes. 51.7 L at 27 C and 90.9 KPa to STP
The second volume : 42.2 L
Further explanationGiven
51.7 L at 27 C and 90.9 KPa
Required
The second volume
Solution
STP = P₂=1 atm, T₂=273 K
T₁ = 27 + 273 = 300 K
P₁ = 90.9 kPa = 0,897 atm
Use combine gas law :
P₁V₁/T₁ = P₂V₂/T₂
Input the value :
0.897 x 51.7/300 = 1 x V₂/273
V₂= 42.20 L
9) A certain atom has 10 electrons, 14 neutrons, and 11 protons. Write the name of this element in isotope notation.
Answer:
²⁵₁₁Na⁺
Explanation:
Details about the atom:
Number of electrons = 10 electrons
Number of neutrons = 14 neutrons
Number of protons = 11 protons
The atomic number of an atom is a good indicator of the type of atom we have been given.
From the subatomic particles, the number of protons is the same as the atomic number.
Since the number of protons is 11, its atomic number will be 11.
The element with atomic number 11 is sodium, Na.
To write a complete notation, we also need the mass number;
Mass number = number of protons + number of neutrons
Mass number = 11 + 14 = 25
The charge on the atom:
Charge = Number of protons - number of electrons = 11 - 10 = 1+
The element in isotopic notation is given as;
²⁵₁₁Na⁺
How many grams of sodium are in
1.000 mole of sodium?
Answer:
Explanation:
How many atoms are in a 3.5 g sample of sodium (Na)? In this example, multiply the grams of Na by the conversion factor 1 mol Na/ 22.98 g Na, with 22.98g being the molar mass of one mole of Na, which then allows cancelation of grams, leaving moles of Na.
Answer:
ONE MOLE of any element has 6.023x1023 atoms of that element. Therefore 1 mole or 22.99 grams of Na = 6.023x1023 atoms of Na.
Explanation:
Madame puts a teabag in her mug of water. Before she has a chance to stir the tea, she hears a sound and goes to see what it was. When she comes back, the tea is distributed throughout the mug. It looks like someone stirred it, but no one else is home. What happened?
Answer:
See the answer below
Explanation:
What really happened was that the component molecule present in the teabag became hydrated as a result of dissolution in water. Once dissolved, the molecules start to move about from the region of higher concentration - that is, the tea bag - to the region of lower concentration until the molecules become uniformly diffused throughout the water in the mug.
The analysis of 2.12 of a compound gave 0.33 of carbon, 1.82 of the same compound gave 1.53 of sulphur. Calculate the emperical formula
Answer:
CS₂
Explanation:
To find the empirical formula we need to determine first the percentage of each atom in the molecule. Then, we need to find the moles and, as empirical formula is the simplest whole-number ratio of atoms we can solve the empirical formula:
%C:
0.33gC / 2.12g * 100 = 15.6%
%S:
1.53g S / 1.82g * 100 = 84.1%
In a basis of 100, the moles of each atom are:
C:
15.6g C * (1mol / 12.01g) = 1.30 moles
S:
84.1g S * (1mol / 32.065g) = 2.62 moles
The ratio of Sulphur-Carbon is:
2.62mol / 1.30mol = 2
That means empirical formula is:
CS₂Some common substances and their chemical formulas are listed in the chart.
Which of these substances are elements?
Answer:
We heart you don't have all the information you just got some common substances and their chemical formulas are listed in the chart? That we don't have the chart to see which of the substances are elements
Explanation:
sorry about that if you can take a picture of it and repost it I am sure I could answer it for you
What is the name of the ability to use up energy in one second
Answer:
Work
Explanation:
Work is defined as the ability to use energy in one second and its SI unit is same as energy that is joule.
Work refers to the energy utilized to displace an object over a distance by an external force in one direction and in given time period which can be one second as well.
Hence, the correct answer is "work".
What causes potential energy to convert to kinetic energy?
Answer:
The system's potential energy is increased by gaining altitude. Then, gravity takes over, causing most of the potential energy to be converted into kinetic energy
Explanation:
3. Nicole plans an investigation to determine the Sun's role in the water cycle. She
places a tomato plant in the sunshine and one in a darkened room. She puts a clear
plastic bag around a leaf on both plants. She waters the plants daily with the same
amount of water. After two days, she notices that there are water droplets on the
inside of the plastic bag on the plant that is in the sunshine. What part of the water
cycle does her experiment show?
A.
B.
It shows how sunlight triggers infiltration in the plant.
It shows how sunlight triggers evaporation in the plant.
It shows how sunlight triggers precipitation in the plant.
It shows how sunlight triggers transpiration in the plant.
C.
D.
Answer:
It shows how sunlight triggers transpiration in the plant.
Explanation:
The water eventually is released to the atmosphere as vapor via the plant's stomata — tiny, closeable, pore-like structures on the surfaces of leaves. Overall, this uptake of water at the roots, transport of water through plant tissues, and release of vapor by leaves are known as transpiration.
