Answer:
Here:
Explanation:
Determine the number of electrons in the atom from its atomic number. (See Below.)
Add electrons to the sublevels in the correct order of filling.
Add two electrons to each s sublevel, 6 to each p sublevel, 10 to each d sublevel, and 14 to each f sublevel.
To check your complete electron configuration, look to see whether the location of the last electron added corresponds to the element’s position on the periodic table.
Predicting the Order of Filling of the Orbitals
There are three ways to predict the order of filling of the orbitals. Probably the least reliable method is to memorize the following list (even though it shows the order of filling of all the orbitals necessary for describing the ground state electron configurations of all of the known elements).
1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5f 6d 7p
Instead of relying on memorization, you can use the memory aid shown below to remind you of the correct order of filling of the sublevels. The following steps explain how to write it and use it yourself.
Write the possible sublevels for each energy level in organized rows and columns like the image below. To do this, you need to remember that there is one sublevel on the first principal energy level, two on the second, three on the third, etc. Every principal energy level has an s orbital. The second principal energy and all higher energy levels have a p sublevel. The d sublevels start on the third principal energy level, the f sublevels start on the fourth principal energy level, etc.
Draw arrows like those you see below .
Starting with the top arrow, follow the arrows one by one in the direction they point, listing the sublevels as you pass through them.
The sublevels that are not needed for describing the known elements are enclosed in parentheses below .
Image of the memory aid that allows you to determine the order of filling for the sublevels
We can also use the block organization of the periodic table, as shown below, to remind us of the order in which sublevels are filled. To do this, we move through the elements in the order of increasing atomic number, listing new sublevels as we come to them. The type of sublevel (s, p, d, or f ) is determined from the block in which the atomic number is found. The number for the principal energy level (for example, the 3 in 3p) is determined from the row in which the element is found and the knowledge that the s sublevels start on the first principal energy level, the p sublevels start on the second principal energy level, the d sublevels start on the third principal energy level, and the f sublevels start on the fourth principal energy level.
We know that the first two electrons added to an atom go to the 1s sublevel.
Atomic numbers 3 and 4 are in the second row of the s block (look for them in the bottom half of in image below), signifying that the 3rd and 4th electrons are in the 2s sublevel.
Atomic numbers 5 through 10 are in the first row of the p block, and the p sublevels start on the second energy level. Therefore, the 5th through 10th electrons go into the 2p sublevel.
Atomic numbers 11 and 12 are in the third row of the s block, so the 11th and 12th electrons go into the 3s sublevel.
Because atomic numbers 13 through 18 are in the p block, we know they go into a p sublevel. Because the p sublevels begin on the second principal energy level and atomic numbers 13 through l8 are in the second row of the p block, the 13th through 18th electrons must go into the 3p sublevel.
The position of atomic numbers 19 and 20 in the fourth row of the s block and the position of atomic numbers 21 through 30 in the first row of the d block show that the 4s sublevel fills before the 3d sublevel.
Moving through the periodic table in this fashion produces the following order of sublevels up through 6s:
1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s
Notice that atomic numbers 57 through 70 on the periodic table below are in the 4f portion of the table. It is a common mistake to forget that the 4f sublevel is filled after the 6s sublevel and before the 5d sublevel. In order to make the overall shape of the table more compact and convenient to display, scientists have adopted the convention of removing the elements with atomic number 57 through 70 and 89 through 102 (the latter being the 5f portion of the table) from their natural position between the s and d blocks and placing them at the bottom of the table. Electrons go into the 5f sublevel after the 7s sublevel and before the 6d sublevel. The second periodic table below shows how the blocks on the periodic table would fit together if the inner transition metals—the f block—were left in their natural position.
Select the correct balanced equation for the single displacement reaction of bromine and potassium iodine.
Br + Kl -> KBr +1
Answer:
D
D...............DDDDDDD
Answer: D
Explanation:
The answer is D as it is the only correctly balanced equation.
write few lines about luis braille
Answer:
Louis braille was a french educator and inventor of a sytem of reading and writing for use use by the blind or visually impaired . his system remains virtually unchanged to this day and is know worldwide simply as braille
Describe briefly how you will determine the relative density of kerosene
Explanation:
First determine the weight of the density bottle(A1) when it's empty.
Then fill it with the liquid you want to determine the density.
Then determine the weight of the bottle with the liquid(A2).
Then the weight of the liquid is equal to (A2 - A1)
You already know the volume of the bottle.
Apply them to density = weight/volume
Make sure to mention the temperature you measured it because density varies from one temperature to another.
1. What are the two effects of the continental plate/continental plate convergent boundary?
2. Where can you find an example of this type of divergent boundary? Which country, continent or ocean?
Answer:
Answer 1: The correct answer is b. convergent continental-continental boundary.
A convergent continental-continental boundary refers to a convergent plate boundary where two continental plates meet or come together. When this happens, a forceful collision occurs, and structures like mountains start to form. The Himalaya mountain range is formed as a result of the convergence of the Indian and Eurasian continental plates.
Answer 2: The correct answer is d. convergent oceanic-oceanic boundary.
Volcanic island arcs refers to a curved line of volcanoes formed from the subduction (sinking) of one oceanic plate below another plate. Examples of volcanic island arcs include Japanese Islands and Alaskan Islands
6. Three of these terms belong together. Which one doesn't belong?
A) nucleus
B) cytoplasm
C) cell wall
D) cell membrane
Explain why the one you chose doesn't belong with the other three?
Answer:
i am 50/50 at the memoent but i have a feeling it is the cytoplasm as it isnt a cell like the others. Hope this helps :(
Explanation:
What is the mass, in grams, of a pure iron cube that has a volume of 3.80 cm?
Answer:
2.66 g of Fe, can be obtained from the reaction
Explanation:
Let's think the reaction:
2Fe₂O₃ + 6CO → 4Fe + 6CO₂
Ratio is 2:4, so If i have x moles of iron (III) oxide, I will produce the double of moles of Fe.
Mass / Molar mass = Mol
3.80 g / 159.7 g/m = 0.0237 moles
0.0237 moles . 2 = 0.0475 moles
Molar mass Fe = 55.85 g/m
Mol . Molar mass = Mass → 0.0475 m . 55.85 g/m = 2.66 grams
Explanation:
If a wave is traveling at 36 m/s and has a frequency of 6 Hz, what is its wavelength?
Answer:
wave length=speed*frequency
=36*6
=216 m
How can a chemical reaction speed up? Pack in more of the reactant to increase the
A. catalyst B. concentration
C. surface area
D. temperature
Answer:
A. catalyst.
Explanation:
Catalyst is something that causes things to decay. I think catalyst is the right answer from what i know from Miraculous Ladybug... Did you know the show was originally going to be an anime?
Analysis of an unknown substance indicates that it is a brittle solid. It acts as an electrical insulator (does not conduct) as a solid but conducts electricity when melted. Which of the following substances would have these characteristics?
a. HCl
b. Al
c. KBr
d. SiF4
e. I2
Answer:
KBr
Explanation:
A metal has a very high melting point. Aluminum is a metal.
Ionic solids do not conduct electricity in the solid state. However, when the solids are melted, they conduct electricity.
KBr is an ionic substance, it can only conduct electricity in molten form because the ions are locked up in the solid.
is a planar carbon "backbone" possible for propane? Explain.
Is a planar carbon "backbone" possible for cyclopropane? Explain.
Answer:
Cyclopropane has a planar carbon back bone while propane does not
Explanation:
We have to recognize that in straight chain saturated organic compounds, carbon atoms have a tetrahedral geometry. Each carbon atom is bonded to four other atoms.
However, carbon atoms in cyclic compounds are also sp3 hybridized with each carbon bonded to only four other atoms but the ring system is highly strained.
Cyclopropane is a necessarily planar molecule with a bond angle that is far less than the expected tetrahedral bond angle due to strain in the molecule. Hence, the carbon atoms may have have a "planar backbone".
I’ll mark brainliest!!! Please solve and say what reaction type.
Answer:
2Al + 6HCl -----> 2AlCl3 + 3H2
Reaction of acid with metals
Cu(OH)2. -----> H2O. + CuO
Dissociation of coper hydroxide / dissociation of base
Explanation:
someone help me pls ada
How many grams of Fe3+ are present in 2.56 grams of iron(III) iodide?
Answer:
436.55841 grams.
Explanation:
The molecular formula for Iron(III) Iodide is FeI3. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Iron(III) Iodide, or 436.55841 grams.
You use the 1 / 436.55841 conversion rate. This is different for each element, according to the stoichiometry tables. Iron(II) oxide would be 2/3 of the 1/436.55841 conversion rate, that is, multiplying the fraction to denominator.
The oldest known flower lived 120, million years ago. Is that a measured or exact number?
Answer:
measured
Explanation:
no way can they pin point exactly when something lived when its in the millions
FUСR THE WORLD SAY AND TO 4142-414=? HELPPPPPPPPPPPPP
Answer:
UMMMMMMMMMMM
Explanation:
Answer:
3729
Explanation:
I need help on these questions!
Answer:
See explanation
Explanation:
Given that;
E = hc/λ
h = 6.63 * 10^-34 Js
c = 3 * 10^8 ms-1
λ = ?
E = 3.978 * 10^-19 J
λ = hc/E
λ = 6.63 * 10^-34 * 3 * 10^8 /3.978 * 10^-19
λ = 19.89 * 10^-26/3.978 * 10^-19
λ = 5 * 10^-7 m The colour is green
2. E = hc/λ
E= 6.63 * 10^-34 * 3 * 10^8 /1000 * 10^-9
E = 1.989 * 10^-19 J
But
E = hf
f = E/h
f = 1.989 * 10^-19/6.63 * 10^-34
f = 3 * 10^14 Hz The radiation is infrared
3. E = hc/λ
λ= hc/E
λ= 6.63 * 10^-34 * 3 * 10^8 /2.0 * 10^-14
λ= 995 * 10^-14 m This is gamma radiation
4. E = hc/λ
E=6.63 * 10^-34 * 3 * 10^8 /620 * 10^-9
E = 3.2 * 10^-19 J
5. E = hf
E= 6.63 * 10^-34 * 2 * 10^17
E = 1326 * 10^-19 J
E = hc/λ
λ= hc/E
λ= 6.63 * 10^-34 * 3 * 10^8 /1326 * 10^-19 = 15 * 10^-9
This is ultraviolet radiation
What chemicals need to make liquid bakelite ?
What was the unknown metal?
Answer:
is there a picture or something?
Explanation:
Explanation:
Your question is incomplete please update it.
what is the mole fraction of cation in 1M of aluminium sulphate
The mole fraction of cation (Al)=0.4
Further explanationGiven
1 M of Aluminium sulphate
Required
The mole fraction of cation
Solution
Ionization of the Aluminum sulfate solution( assume 1 L solution ) :
mol Al₂(SO₄)₃ = M x V = 1 M x 1 L = 1 mol
Al₂(SO₄)₃⇒2Al³⁺ + 3SO₄²⁻
1 mol 2 mol 3 mol
From this equation, total mol in solution = 2+3 = 5 moles
Mol fraction Al(as a cation) :
= 2/5=0.4
Compounds
are the same as molecules
have the same properties as the elements they are made from
have different properties from the elements they are made from
can only exist as solids or liquids
Answer:
have different properties from the elements they are made from
Explanation:
Compounds have different properties from the elements they are made from. Compounds are substances composed of two or more kinds of atoms/elements joined together in a definite grouping.
The properties of a compound are distinct and different from those of the individual elements that are combined in its make-up. There are several millions of compounds that are known. These are derived from elements.Answer:
Que?
Explanation:
If you put an iron nail into a beaker of copper chloride, you will begin to see a reddish precipitate forming on the nail. In this reaction, iron replaces copper in the solution and copper falls out of the solution as a metal.
The balanced equation is Fe+CuCl -> FeCl2+Cu
If you start out with one mole of your limiting reactant (Fe), how many grams of copper can you expect to produce through this reaction?
Answer:
63.6g
Explanation:
The reaction expression is given as:
Fe + CuCl₂ → FeCl₂ + Cu
Given:
Number of moles of Fe = 1 mole
Unknown:
Mass of copper that would be produced;
Solution:
From the balanced reaction expression:
1 mole of Fe will produce 1 mole of Cu;
So;
Mass of Cu produced = number of moles x molar mass
Mass of Cu = 1 mole x 63.6g/mol = 63.6g
A gas mixture in a rigid container has a total pressure of 2.5 atm. One gas, lets call it X, has 0.85 moles and accounts for 1.2 atm of pressure. What is the mole fraction of the other gases (all gases that are not X) in the container?
The mole fraction of the other gases : 0.52
Further explanationGiven
P tot = 2.5 atm
P x = 1.2 atm, n = 0.85 moles
Required
mole fraction
Solution
P tot = P gas X + P other gases
mol fraction = mol x : mol total
P gas X = mol fraction gas X x P total
1.2 atm = mol fraction gas X x 2.5 atm
mol fraction gas X = 0.48
mol fractionof the other gases = 1 - 0.48 = 0.52
Or we can use
P other gases = 2.5 - 1.2 = 1.3 atm
mol fraction the other gases = 1.3 : 2.5 = 0.52
Which of the statements about liquids and gases are true?
Both liquids and gases have a definite volume.
O The particles in liquids and gases can move past one another
freely
Both liquids and gases have a definite shape.
Neither liquids nor gases have a definite shape.
Which of the statements about liquids and gases are true?
Answer:The particles in liquids and gases can move past one another freely.
#CARRYONLEARNING #STUDYWELLWhich of the statements about liquids and gases are true?
Choosing:Both liquids and gases have a definite volume.
The particles in liquids and gases can move past one another freely
Both liquids and gases have a definite shape.
Neither liquids nor gases have a definite shape.
Answer:The particles in liquids and gases can move past one another freely.
#READINGHELPSWITHLEARNING #CARRYONLEARNING #STUDYWELLcarbon dioxide is in a steel tank at 20 degrees celsius and 10 liters. what is the volume on the gas when the tank is heated to 100 degrees celsius?
Answer:
12.73 L
Explanation:
Given that,
Initial temperature, [tex]T_i=20^{\circ}=20+273=293\ K[/tex]
Initial volume, [tex]V_i=10\ L[/tex]
We need to find the volume on the gas when the tank is heated to 100 degrees celsius or 373 K.
We know that volume is directly proportional to the temperature of the gas. Using above relation,
[tex]\dfrac{V_i}{T_i}=\dfrac{V_f}{T_f}\\\\V_f=\dfrac{V_iT_f}{T_i}[/tex]
Putting all the values,
[tex]V_f=\dfrac{10\times 373}{293}\\\\V_f=12.73\ L[/tex]
So, the final volume of the gas is 12.73 L.
What do scientists think is the
reason the mollusks have been so
successful through time?
B
Answer: Body plans change as new challenges arise.
Explanation:
The mollusks are the invertebrate animals. They live marine environment. They live in shallow waters. They have been found in variety of marine habitats so this indicates their adaptiveness to different conditions. They have body plan that comprises of shell, mantle, radula and muscular foot that helps in survival and adaptation in different conditions. The shell and mantle are hard structures which protect these animals from predators and also help them to camouflage. Also the muscular foot helps in locomotion. Radula helps in feeding. Oysters, snails are some examples of mollusks.
A student working in the laboratory produces 6.81 grams of calcium oxide, CaO, from 20.7 grams of calcium
carbonate, CaCO3, according to the reaction CaCO3 → CaO + CO2. Calculate the theoretical yield and
the percent yield for the reaction. Show and/or explain your work.
Answer:
A. Theoretical yield of CaO is 11.59 g
B. Percentage yield of CaO = 58.76%
Explanation:
The following data were obtained from the question:
Mass of CaCO₃ = 20.7 g
Actual yield of CaO = 6.81 g
Theoretical yield of CaO =?
Percentage yield of CaO =?
The equation for the reaction is given below:
CaCO₃ —> CaO + CO₂
Next, we shall determine the mass of CaCO₃ that decomposed and the mass of CaO produced from the balanced equation. This can be obtained as follow:
Molar mass of CaCO₃ = 40 + 12 + (3×16)
= 40 + 12 + 48
= 100 g/mol
Mass of CaCO₃ from the balanced equation = 1 × 100 = 100 g
Molar mass of CaO = 40 + 16 = 56 g/mol
Mass of CaO from the balanced equation = 1 × 56 = 56 g
SUMMARY:
From the balanced equation above,
100 g of CaCO₃ decomposed to produce 56 g of CaO.
A. Determination of the theoretical yield of CaO.
From the balanced equation above,
100 g of CaCO₃ decomposed to produce 56 g of CaO.
Therefore, 20.7 g of CaCO₃ will decompose to produce =
(20.7 × 56)/100 = 11.59 g of CaO.
Thus, the theoretical yield of CaO is 11.59 g
B. Determination of the percentage yield.
Actual yield of CaO = 6.81 g
Theoretical yield of CaO = 11.59 g
Percentage yield of CaO =?
Percentage yield = Actual yield /Theoretical yield × 100
Percentage yield = 6.81/11.59 × 100
Percentage yield of CaO = 58.76%
Which of the following elements is most reactive?
A.LI
B.Ne
C.K
D.Au
E.Cs
Answer:
E
Explanation:
Anything going down Column 1 is going to be more reactive than anything else.
So the only contenders that are in column 1 are Li and Cs. The most reactive ones are the ones going down.
Cs is at the bottom of column 1. The answer is E
Sodium chlorite decomposes into salt and oxygen gas. What is the correct balanced decomposition reaction.
NaClO3 -> NaCl + O2
Answer:
i think it would be c
Explanation:
sorry if it is wrong
Answer:
2NaClO₃ -> 2NaCl + 3O₂
Explanation:
The number of atoms in the reactants has to equal the number of atoms in the products.
Hope that helps.
At what step of glycolysis one NADH+ H+ is formed?
Answer:
During Glycolysis, there is one step where NADH + H+ is formed from NAD+ O F-6-P - F- 1,6-BP O PGAL – 1,3-BPGA O 2-PGA - PEP O 3-PGA → 2-PGA.
Construct an explanation using Newton's Laws of Motion to describe the effects of balanced and unbalanced forces on the motion of an object.
Answer:
The manner in which objects will move is determined by the answer to this question. Unbalanced forces will cause objects to change their state of motion
Explanation:
Since these two forces are of equal magnitude and in opposite directions, they balance each other.
Answer:
balance force are those force whose resultant force is zero and unbalanced force are those whose resultant are non zero