Answer:
Cl^- = 5.75
K^+ = 7.75
Explanation:
Now let us calculate the effective nuclear charge four K^+ and Cl^- from Slater's rule.
Given that Cl^- and K^+ has electronic configuration of; [Ne] 3s2 3p6 (they are isoelectronic species)
We compute S as follows;
For n - 2 level, S= 1
For n - 1 level, S= 0.85
For ns,np level S= 0.35
Note: S= screening or shielding constant
1s2, S=2 ×1 = 2
2s2 2p6, S= 8×0.85 = 6.8
3s2 3p6, S= 7 × 0.35 = 2.45
The electron under study is not considered hence seven out of eight electrons in the shell are considered
Hence
S= 2 + 6.8 + 2.45 = 11.25
Since Cl^- has 17 electrons;
Zeff(Cl^-) = 17 - 11.25 = 5.75
For K^+
Zeff = 19 - 11.25 = 7.75
Identify and give an example of at least two molecular properties that could be used to separate a substance from a mixture.
Answer:
Two molecular properties that could be used to separate a substance from a mixture are - Filtration and Chromatography .
Explanation
Molecular property -Molecular properties include the chemical properties, physical properties, and structural properties of molecules, including medicines. Typically, molecular properties do not include a chemical compound's pharmacological or biological properties.
Filtration -: Using a filter medium that allows the fluid to move through but not the solid, filtration is a method used to distinguish solids from liquids or gases. The term 'filtration' refers whether the filter is mechanical, chemical, or physical. The filtrate is considered the fluid that flows through the filter. A surface filter, which is a solid that traps solid particles, or a depth filter, which is a bed of material that traps the solid, may be the filter medium.Usually, filtration is an imperfect operation. On the feed side of the filter or embedded in the filter media, some fluid remains and some tiny solid particles make their way through the filter.
example - Filters containing fibers that trap particulates are used by many aquariums.
Chromatography -: A laboratory method for the isolation of a mixture is chromatography. The mixture is dissolved in a fluid called the mobile phase (gas, solvent, water) that carries it through a device (a column, a capillary tube, a plate, or a sheet) on which a material called the stationary phase is fixed. For the stationary step, the different constituents of the mixture have different affinities.Chromatography can be analytical or preparatory. Preparative chromatography is intended to isolate the components of a mixture for subsequent use and is therefore a method of purification. Analytical chromatography is usually conducted with smaller quantities of material and is intended to assess the presence of analytes in a mixture or to measure their relative proportions. Both are not limited to each other.
An example of chromatography is when a chemical reaction is used to separate each of the various sized molecules on a piece of paper in a liquid compound into their own pieces.
Hence , the answer is filtration and chromatography .
CCl4(l) is placed in a previously evacuated container at 30°C , and some of the CCl4(l) evaporates. In the box below, draw a particulate diagram to show the species in the container after some of the CCl4(l) has evaporated. The phases of the species should be indicated by the spacing and distribution of the particles in the diagram. Some of the species shown in the legend will not be used.
Answer:
The phases of the species should be indicated by the spacing and distribution of the particles in the diagram
Explanation:
Evaporation would be a phase change from liquid to gas where intermolecular forces are broken CCl4 (l) -> CCl4 (g)
Diagram is attached below
We have that from the diagram that when CCl4(l) is placed in a previously evacuated container at 30°C , and some of the CCl4(l) evaporates that the molecules of CCl4(g) becomes loosely held and apart from while in its closely held in its liquid state.
From the question we are told
CCl4(l) is placed in a previously evacuated container at 30°C , and some of the CCl4(l) evaporates. In the box below, draw a particulate diagram to show the species in the container after some of the CCl4(l) has evaporated. The phases of the species should be indicated by the spacing and distribution of the particles in the diagram. Some of the species shown in the legend will not be used.
Generally
We will see from the diagram that when CCl4(l) is placed in a previously evacuated container at 30°C , and some of the CCl4(l) evaporates that the molecules of CCl4(g) becomes loosely held and apart from while in its closely held in its liquid state
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Convert this mass to SI Unit: 2000g
Answer: 2 kg
Explanation:
What effects do mutations have? Check all that apply.
Answer:
A,C,E,F
Explanation:
what do you think would be a good science fair project for an 8th grade advanced class?
Answer:
maybe something about planets or the solar system and they have to make them
Explanation:
Answer:
create a rainbow of flames or build an infinty mirror
Explanation:
Is this a chemical reaction? Explain your reasoning. (Will give brainliest)
Answer:
No, it looks like there is no gas forming no foaming or burning so it is not
Explanation:
Please help!!!!!!!!! ASAP!!!
Answer:
0.00505
Explanation:
You can google the answer or try to learn how to convert it
saturn is about 1 429 000 km from the sun. how many meters is saturn from the sun?
Answer:
1.493 trillion
Explanation:
Answer:
you must convert km to meters
Explanation:
Explain the difference between potential energy and kinetic energy.
Sentence Starters
"Potential Energy is. . "
"Kinetic Energy is. . "
"The difference between potential energy and kinetic energy is. . ."
Answer:
Potential energy is the stored energy in an object or thing, while kinetic energy is the energy which an object contains because of a particular motion.
Explanation:
Potential energy is energy that is stored for example a wind up toy, it has energy but in order for you to get kinetic energy, it has to move. So kinetic energy is moving energy.
The difference is that potential is stored and kinetic is moving energy.
1s^ 2 2s^ 2 2p^ 6 3s^ 2 3p^ 6 4s^ 2 3d^ 10 4p^ 2 what element is this
Answer:
please use shell notation
what is percipatation
Answer:
Water that falls from the clouds.
Explanation:
A science teacher heated liquid ethanol for an experiment. When he turned up the temperature, the ethanol quickly disappeared, and a strong aroma filled the room. What happened to the ethanol?
Answer:
Heating the particles in the ethanol energized them, and they escaped to fill the room as a gas
Explanation:
Ethanol reacted and bonded with the gases in the air and so after heating the ethanol ,it quickly disappeared and a strong aroma was filled in the room .
What do you mean by ethanol ?Ethanol is a primary alcohol that is ethane in which one of the hydrogens is substituted by a hydroxy group.
Ethanol is an important industrial chemical; it is used as a solvent, in the synthesis of other organic chemicals.
Ethanol produced either by fermentation or by synthesis is obtained as a dilute aqueous solution and must be concentrated by fractional distillation.
Ethanol reacted and bonded with the gases in the air and so after heating the ethanol ,it quickly disappeared and a strong aroma was filled in the room .
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which 2 statements describe a mixture?
1. It includes atoms of different elements.
2. Its parts can be separated using physical means.
3. It can result from chemical bonding.
4. It is a pure substance.
Answer:
It's parts can be separated using physical means.It is a pure substance.The Periodic Table of elements is arranged by:
O atomic mass
O number of neutrons
O number of electrons
O atomic number
Answer:
atomic number
Explanation:
Answer:
number of electrons and number of neutrons
What is a polar molecule?
A. A molecule with symmetrical polar covalent bonds
B. A molecule with symmetrical nonpolar covalent bonds
C. A molecule with a negative pole and a positive pole
D. A molecule with two atoms of the same electronegativity
Explanation:
A molecule with a negative pole and a positive pole is called a polar molecule.
(d) A molecule with two atoms of the same electronegativity
What is meant by a polar molecule?A polar molecule is usually formed when the one end of the molecule is said to possess more positive charges and whereas the opposite end of the molecule has negative charges, creating an electrical pole.
What is a polar molecule example? Water (H2O) is a polar molecule. The bonds between hydrogen and oxygen are distributed so that the hydrogen atoms are both on one side of the oxygen atom rather than evenly spaced.Sodium Chloride (NaCl) which is an ionic compound acts as a polar molecule. Usually, the large difference in electronegativities in sodium and chlorine makes their bond polar.Learn more about polar molecule on https://brainly.com/question/11405437
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In a chemical change, the same atoms are recombined into a new substances,
True
Or False
Which roller coaster
car has the least potential energy due to gravity
Answer:
the roller coaster car with the least potential energy would be the one at the bottom of the roller coaster
Explanation:
Hope this helped
Na + HCI → H2 + NaCl
The number of protons in an element can be found by looking at the
symbol
atomic number
O average atomic mass
O name
Answer:
atomic number if it's a answer
Answer:
I think its the average atomic mass.
Explanation:
the amplitude of a wave is measured from
A. Trough to trough
B. Crest to resting position
C. Crest to crest
D. Crest to trough
Pieces of inorganic or organic materials that come from rock and are
deposited by wind, water, or ice are called...
1.weathering
2. sediment
3.erosion
4.drought
Answer:
Sediment
Explanation:
Use the picture to answer the question.
Name at least three physical properties of the bowling
ball.
Answer:
The physical properties is hardness shape and color, I choose hardness because I have grabbed bowling balls before and they are very hard well there could be different types of bowling balls made of different things but I have never seen one or toughed a bowling ball that is not hard. Another physical property I chose for the bowling ball was shape, The reason I chose shape was because the bowling ball is circle, the actual name for a 3-D circle is sphere. The last physical property for a bowling ball is color because mostly all bowling balls have color for example the one in the picture it is red with a little bit of pink, there is many different bowling balls that have different color different hardness but NOT different shape. That is the physical properties of a bowling ball.
Explanation:
Hope this helps everyone who needed help with this :)
Is the freezing point of this 5??
Please correct my mistake if it isn't.
Answer:
yes
Explanation:
Answer:
yes
Explanation:
you're smart have a nice evening
i sweari need ur help
3-Mention the trends in atomic size,atomic number,mass number,reactivity,boiling & melting points.
Answer:
1 sec......................
Answer:
happy halloween Baby i love you
Explanation:
You are an employee at "cash for gold" and a customer comes in looking to exchange gold for money. They claim to have 3.47 gram nugget of fold. How many particles (atoms) of gold are in one nugget? With work shown
Answer:
The number of atoms in 3.47 gram nugget of gold is approximately 1.0606 × 10²² atoms
Explanation:
The given mass of gold = 3.47 grams
The molar mass of gold = 196.96657 g/mol
The number of moles of gold in 3.47 grams of gold = 3.47 grams/(196.96657 g/mol)
The number of moles of gold in 3.47 gram nugget of gold = 0.01762 moles
The number of atoms in one mole of gold = 6.02 × 10²³ atoms
The number of atoms in 0.01762 moles of gold = 6.02 × 10²³ atoms/mole × 0.01762 moles
The number of atoms in 0.01762 moles of gold ≈ 1.0606 × 10²² atoms
∴ The number of atoms in 3.47 gram nugget of gold ≈ 1.0606 × 10²² atoms.
C₂H₂
a. resonance
b. no resonance
Answer:
no resonance
Explanation:
Since there is only one possible lewis structure C2H2 does not have resonance. A molecule has resonance if more than one lewis structure can be drawn for that molecule. For molecules with resonance, each lewis structure individually does not accurately depict the structure of the molecule
What part of the atom is responsible for the behavior of the alpha particles?
Answer:
nucleus
Alpha particles are subatomic fragments consisting of two neutrons and two protons. Alpha radiation occurs when the nucleus of an atom becomes unstable (the ratio of neutrons to protons is too low) and alpha particles are emitted to restore balance.
Explanation:
The number of electrons in the first three energy levels for four neutral elements is shown in the table. The element with the highest ionization energy is-
Answer:
The correct option is;
Element 2
Explanation:
The ionization energy is the energy required to eject an electron from a gaseous ion or atom
The ionization energy increases across the period and increases up the group
The elements with the highest ionization energy are those that have the complete octet structure in their outermost shell, which are the noble gases
Therefore, given that element 2, which has the complete octet structure in the outermost shell, then it is an element of the noble gases which have the highest ionization energy in a period, and therefore has the highest ionization energy.
On the periodic table, the element with 10 electrons is Neon, with ionization energy of 2080.68 kJ/mol which is the second highest after helium, that has only 2 electrons.
Which best compares a molecule that has a trigonal planar shape with one that has a trigonal pyramidal shape?
O They both contain three lone pairs of electrons around the central atom.
O They both contain three atoms around the central atom.
O The central atom of the trigonal planar molecule has two lone pairs around it, but the central atom of the trigonal
pyramidal molecule has only one.
O The central atom of the trigonal planar molecule has two atoms around it, but the central atom of the trigonal
pyramidal molecule has only one.
Answer:
B. They both contain three atoms around the central atom.
Explanation:
Answer: b
Explanation:
A balloon is a sphere with a radius of 5.0 m. The force of air against the walls of the balloon is 45 N.
What is the air pressure inside the balloon?
Surface area = 12.56 × radius²
1 Pa = 1 N/m²
How would one solve this? What is an easy way to remember how to solve this problem or a list of steps to solve?
Answer:
1.4 x 10^-1 Pa
Explanation:
answer is above