Answers
Answer:
Option C is the correct option.The Valence electrons in S
Explanation:
Sulphur has highest effective nuclear charge as in a period there is increase in effective nuclear charge from left to right.Sulphur is in the end in a period leaving Mg and Al in left side.
Hope this helps....
Good luck on your assignment...
Related Questions
write an ionic equation of hydrogen peroxide reacting with sodium sulphite
Answers
Answer:
Na2SO3 + H2O2 = Na2SO4 + H2O
The ionic equation of hydrogen peroxide reacting with sodium sulphide is Na₂SO₃ + H₂O₂ = Na₂SO₄⁻ + H₂O⁺.
What is an ionic equation?A chemical equation known as an ionic equation expresses the constituents in an aqueous solution as dissociated ions. The ionic equation is written by using charge in them.
An example is "NaCl" is "Na⁺ + Cl⁻".
To write an ionic equation, we should write by dissolving all soluble ionic chemicals into their corresponding ions. To demonstrate that an ion is present in the solution, it should be displayed with its charge and an (aq). There is also a use of coefficient.
The reaction should be written as:
HS₂O₄ → 2H+ + (SO₄)²⁻
NaOH → Na+ + (OH)-
Na₂SO₄ → 2Na+ + (SO₄)²⁻
H2O exists in the molecular form
So we get 2H+ + (SO₄)²⁻ + 2Na+ + 2(OH)- →2Na+ + (SO₄)²⁻ + 2H₂O
Thus, the ionic equation is Na₂SO₃ + H₂O₂ = Na₂SO₄ + H₂O.
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compare the contrast the arrangment of elements in mendeleev prodic table and mordern prodic table
Answers
Answer: In Mendeleeve periodic table the elements are arranged in increasing atomic mass, whereas in the modern periodic table the elements are arranged in increasing atomic number. The further differences are as follows:
Explanation:
In Mendeleev periodic table there are 9 verticle columns, whereas in modern periodic table there are 18 verticle columns.
A group of nobel gases was not discovered in the Mendeleev periodic table, whereas the a nobel gas was placed separately in the modern periodic table.
Answer:
The elements are arranged in the growing order of atomic masses in Mendeleev's periodic table. On the other hand, the cells are placed in the modern periodic table in the vastly increased order of increasing atomic numbers that is a more fundamental characteristic than the orbital radius.
Explanation:
The stance of the elements throughout the Mendeleev periodic table was to comply with the atomic mass. The position of the elements in the modern periodic table is controlled by the electronic structure, which evaluates their characteristics. The place of isotopes in Mendeleev's periodic table was not justified. The category is based mostly on the number of atoms and not the molar weight in the periodic table of elements and thus is justified the location of isotopes. The periodic table provided by Mendeleev had some linguistic factors on the atomic mass. There have been no defects in current periodic law as regards atomic number. For example, potassium had a lesser height in Mendeleev's periodic table than argon. But this has been solved in the Modern periodic table. Argon supersedes phosphorus as atomic number 18 is argon, so potassium has 19. The periodic table on Mendeleev does not authors would like to thank why the characteristics of the components are replicated at frequent intervals of 2, 8, 18, and 32. That is paper outlines by the periodic table of elements. The periodic table of Mendeleev contains no clear cut components of different types of elements. There is a clear cut separation of different types of elements in the modern periodic table, like representative elements, oxygen atoms, affect consumers. The periodic table provided by Mendeleev is not easy to remember. The periodic table Traditional is easy to recall.First gets brainliest
Answers
Answer:
reactants : before arrow sign
: CH4 and O2
product : after arrow sign
: CO2 and H2O
the answer is the second option
CH₂ - CH₂ - O-CH₂
what is it's IUPAC name?
Answers
The gas in the ozonosphere that absorbs most of the ultraviolet rays from the sun is the___. Oxygen Nitrogen Ozone. Carbon dioxide.
Answers
Answer:
Ozone
Explanation:
The ozone layer protects the UV rays and also theres a hole in it near antarica which is causing global warming!
Off topic sorry lol:P
I hope this helps i got the answer correct
Remember to mark brainliest
This is how osmium appears in the periodic table. Rounded to the nearest whole number, how many neutrons, on average, are in an atom of osmium?
76
114
190
266
Answers
Answer:
114
Explanation:
bottom number minus top number. just did the test
A chemistry student in lab needs to fill a temperature-control tank with water. The tank measures 24.0 cm long by 21.0 cm wide by 13.0 cm deep.
In addition, as shown in the sketch below, the student needs to allow 2.0 cm between the top of the tank and the top of the water, and a round-bottom flask
with a diameter of 10.5 cm will be just barely submerged in the water.
Calculate the volume of water in liters which the student needs. Round your answer to the nearest 0.1 L. ol.2 cm
M
flask
OL
6
water
Answers
Answer:
The required volume of water the student needs is 4.9 litres of water
Explanation:
From the diagram related to the question, we have;
The dimensions of the tank are;
Length of tank = 24.0 cm = 0.24 m
Width of tank = 21.0 cm = 0.21 m
Depth of tank = 13.0 cm. = 0.13 m
Allowance provided between the top of the tank and the top of the water = 2.0 cm
Diameter of the round bottom flask, D = 10.5 cm = 0.105 m
Therefore, the radius of the round bottom flask, r = 0.105/2 = 0.0525 m
Therefore we have;
Depth of water in the tank = Depth of tank - Allowance provided between the top of the tank and the top of the water
∴ Depth of water in the tank = 13.0 - 2.0 = 11.0 cm = 0.11 m
Given that the flask is immersed in the water contained in the tank to raise the tank water level, we have;
Volume of water + Volume of flask in the tank = Length of tank × Width of tank × Depth of water in the tank
Volume of water + Volume of flask in the tank = 0.24 × 0.21 × 0.11 = 0.005544 m³ = 0.005544 m³× 1000 l/m³ = 5.544 l
The volume of the spherical flask = 4/3·π·r³ = 4/3·π·0.0525³ = 6.06×10⁻⁴ m³ = 6.06×10⁻⁴ m³ × 1000 l/m³ = 0.606 l
The required volume of water the student needs , V = Volume of water + Volume of flask in the tank - The volume of the spherical flask = 5.544 l - 0.606 l = 4.9 l.
What is the [OH-] of solution with pH of 3.4?
(A) 4 x 0.0001M
(B) 4 x 1/100000000000
(C) 2.5 x 0.0001M
(D) 2.5 x 1/100000000000
Answers
Answer:
(A) 4×0.0001M
Explanation:
[OH-] = 10^-3.4 which is equivalent to 4×0.0001M
Answer:
2.5 x 10^ -11 (D)
Explanation:
[H+] = 10^ -3.4 = 3.98 x 10^ -4
[OH-] = (1 x 10^ -14) ÷ [H+] = 2.5 x 10^ -11
Ammonia (NH3) reacts with oxygen to form nitrogen monoxide and water. All the materials involved in this reaction are gasses. 0.100 moles of each of the reactants are initially introduced to a 5.0-liter reaction vessel. a. What would be the quantity of each gas in the container upon completion of the reaction? b.What would be the partial pressure of each gas on the reaction vessel upon reaction completion if the temperature of the system is 105 degrees C? c. What is the total pressure of all the gases on the reaction vessel at 105 degrees C?
Answers
Answer:
a. 0.02 moles of NH₃, 0 moles of O₂, 0.08 moles of NO, 0.12 moles of H₂O
b. [tex]P_{NH_3}[/tex] = 12,576.5 Pa, [tex]P_{NO}[/tex] = 50,306.05 Pa, [tex]P_{H_2O}[/tex] = 74,459.1 Pa
c. The total pressure is 138,341.64 Pa
Explanation:
a. NH₃ + O₂ → NO + H₂O
The balanced chemical equation is first found to be
4NH₃ + 5O₂ → 4NO + 6H₂O
Therefore, we have;
4 moles of NH₃ reacts with 5 moles of O₂ to form 4 moles of NO and 6 moles H₂O
Dividing by the reactant with the highest number of moles which is 5 moles of oxygen gives;
4/5 moles of NH₃ reacts with 5/5 moles of O₂ to form 4/5 moles of NO and 6/5 moles H₂O
Which is the same as 4/5 moles of NH₃ reacts with 1 mole of O₂ to form 4/5 moles of NO and 6/5 moles H₂O
Multiplying by 0.100 gives;
0.1×4/5 moles of NH₃ reacts with 0.1 mole of O₂ to form 0.1×4/5 moles of NO and 0.1×6/5 moles H₂O
The quantity of each gas in the container upon completion of the reaction is therefore;
(0.1 - 0.1×4/5) = 0.02 moles of NH₃
0 moles of O₂
0.08 moles of NO
0.12 moles H₂O
b. Given that the temperature = 105°C, we have;
PV = nRT
P = nRT/V
Where:
n = Total number of moles = 0.02 + 0.08 + 0.12 = 0.22 moles
R = Universal gas constant = 8.3145 J/(mol·K)
T = Temperature = 105°C = 378.15 K
V = Volume = 5 litre = 0.005 m³
P = 0.22×8.3145×378.15/0.005 = 138,341.64 Pa
From Dalton's law of partial pressure, we have;
Partial pressure Pₓ = Xₓ × P
Where:
Xₓ = Mole fraction
Which gives for ammonia NH₃ with 0.02 moles;
Mole fraction = 0.02/0.22 = 1/11
[tex]P_{NH_3}[/tex] = 1/11 × 138,341.64 = 12,576.5 Pa
For the 0.08 moles of NO, we have
Mole fraction = 0.08/0.22 = 4/11
[tex]P_{NO}[/tex] = 4/11 × 138,341.64 = 50,306.05 Pa
For the 0.12 moles H₂O
P = 0.12×8.3145×378.15/0.005 = 74,459.1 Pa
Mole fraction = 0.12/0.22 = 6/11
[tex]P_{H_2O}[/tex] = 6/11 × 138,341.64 = 74,459.1 Pa
c. The total pressure = 12,576.5 Pa + 50,306.05 Pa + 74,459.1 Pa = 138,341.64 Pa.
the lowest layer of Earths atmosphere is the__
Answers
Answer:
Troposphere
Explanation:
The troposphere is the lowest layer in the atmosphere, and where all the weather occurs. After the troposphere, there's the stratosphere, mesosphere, thermosphere, and exosphere.
I hope this helps!
Answer:
Troposphere is the lowest layer of the earths atmosphere.
Explanation:
One solution turns blue. A possible hydrogen ion
concentration for this solution is:
1x 10-2 M.
5x 10-2 M
5 x 10 M
1x 10-8 M
Answers
Answer:
1x10^-8 M
Explanation:
Since the solution turns blue, it mean the solution is a base.
Now, to know which option is correct, we need to determine the pH of each solution. This is illustrated below:
1. Concentration of Hydrogen ion, [H+] = 1x10^-2 M
pH =..?
pH = - log [H+]
pH = - log 1x10^-2
pH = 2
2. Concentration of Hydrogen ion, [H+] = 5x10-2 M
pH =..?
pH = - log [H+]
pH = - log 5x10^-2
pH = 1.3
3. Concentration of Hydrogen ion, [H+] = 5x10 M
pH =..?
pH = - log [H+]
pH = - log 5x10
pH = - 1.7
4. Concentration of Hydrogen ion, [H+] = 1x10-8 M
pH =..?
pH = - log [H+]
pH = - log 1x10^-8
pH = 8
A pH reading shows if the solution is acidic or basic. A pH reading between 0 and 6 indicates an acidic solution, a pH reading of 7 indicates a neutral solution while a pH reading between 8 and 14 indicates a basic solution.
From the above calculations, the pH reading indicates a basic solution when the hydrogen ion concentration was 1x10^-8 M.
(a) Complete the following sentences for an atom of uranium-238. (2)
mass number:
number of protons:
number of neutrons:
number of electrons:
Answers
No of protons = 92
No of electrons = 92
No of neutrons = 238-92 = 146
How many electrons in mole will discharge
2g of Copper 2 ions
Answers
Explanation:
96.485 columbs=1 faraday will
deposit 64/2g= 32 g cu ion
therfore it will require
96,485 ×2/32 =? coulombs or 1/16 of
Faraday= 1 / 16 mole of electrons .
What volume (in liters) does 2.895 moles of oxygen occupy at stp?
Answers
Answer:
64.9 L
Explanation:
pls mark as brainliest
112,300 joules heat is transferred when 240 g of a
metal sample is cooled from 880 °C to 13 °C. What
is the specific heat of this metal?
Answers
Answer:
0.54 J/goC
Explanation:
Recall that we define the heat transferred as ;
H= mcθ
Where;
H= heat transferred = 112300J
m= mass of the metal= 240g or 0.24 Kg
c= specific heat capacity of the metal = the unknown
θ= change in temperature = (880°C-13°C) = 867°C
Substituting values and making the specific heat capacity the subject of the formula;
c= H/mθ
c= 112300/ 240×867
c= 0.54 J/goC
Hence, the specific heat capacity of the metal is 0.54 J/goC.
an element p has atomic number 13 while q has the atomic 16..write down electric configuration of p and q
Answers
Answer:
P = 2,8,3
q = 2,8,6
Explanation:
Because the first shell contain 2 electron and the 2nd contain 8 electron and the last shell contain the electron which is left
Explanation:
p=1s^2,2s^2,2p^6,3s^2,3p^1
q=1s^2,2s^2,2p^6,3s^2,3p^4
the quantum numbers are used in my answer.
there are 4 quantum numbers.
1.principal quantum numbers
2.angular momentum quantum numbers
3.magnetic quantum numbers
4.spin quantum numbers
In this case,the angular momentum quantum numbers is being used.it describes the unique quantum state of an electron and is designated by the letter L.this behaviour manifests itself as the shape of the orbital.electron shells have distinct shapes denoted by letters,s,p,d,f.
l can be numbers like,0,1,2,3
the maximum electrons in each letter is,
s=2
p=6
d=10
f=14
the shapes of the sub_shells
s sub_shell is spherical
p sub_shell is two dumb_bells
d sub_shell is four dumb_bells
f sub_shell is eight dumb_bells
the solution
. Which of the following trioxonitrate (v) will decomposes to its corresponding metal?
A. AgNO3 B. Zn(NO3)2 C. Pb(NO3)2 D. Cu(NO3)2
Answers
Answer:
A. AgNO3
I hope it's helps
Se mezclaron 2 soluciones de dicromato de potasio : 250 ml de una molaridad de 1.24m y 380ml de otra 0.65N. Determina la molaridad de la solución restante
Answers
Answer:
0.56M es la concentración de la solución restante
Explanation:
La molaridad de una solución es una unidad de concentración definida como la relación entre las moles de soluto (En este caso, dicromato de potasio) y el volumen de la solución.
Sabiendo que para el ion dicromato:
6M = 1N
La normalidad del ion dicromato se obtiene dividiendo entre 6 su molaridad.
Moles de dicromato en las dos soluciones son:
1. 0.250L × (1.24mol / L) = 0.310 moles de dicromato
2. 0.380L × (0.65eq / L) × (1eq / 6mol) = 0.042 moles de dicromato
Así, las moles totales de dicromato de potasio son:
0.310moles + 0.042 moles = 0.352 moles de dicromato
En un volumen de 250mL + 380mL = 630mL = 0.630L
La molaridad de la solución es:
0.352 moles / 0.630L =
0.56M es la concentración de la solución restanteYou are performing an experiment and produce an unidentified compound. You know it is composed of carbon, calcium, and oxygen but you do not know how many of each are present. You determine its relative formula mass is 100.1 g/mol. What is its molecular formula?
A. Ca2CO
B. CaCO3
C. Ca2C2O2
D. all of these
Answers
Answer:
B. CaCO3
Explanation:
Answer via Educere/ Founder's Education
[tex]CaCO_3[/tex] has its relative formula mass is 100.1 g/mol. Thus, the second choice is the compound.
What is molecular mass?The molar mass/molecular weight is actually the sum of the total mass in grams of the atoms present to make up a molecule per mole.
Given the relative formula mass = 100.1 g/mol
Unknown:
Molecular formula of the compound
Solution:
To identify this compound, let us find the molecular mass of the choices given.
The one that tallies with the number 100.1 g/mol is the solution:
For;
[tex]CaCO_3[/tex];
Atomic mass of Ca = 40.078
Atomic mass of C = 12
Atomic mass of O = 16x3
Insert the parameters and solve;
Relative molecular formula = 40.078 + 12 + 48 = 100.078
g/mol
So, the second choice is the compound.
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why helium is duplet ??
Answers
Answer:
The outermost shell of helium for example is filled with only two electrons. Hydrogen and lithium become stable by acquiring the electronic configuration of the nearest inert gas, which is helium. This is the duplet (or duet) rule.
Explanation:
how many grams of aluminum are required to produce 8.70 moles of aluminum chloride
Answers
Answer:
234.9 grams
Explanation:
Hope this helps
What best describes the motion of iron atoms in solid iron?
Answers
Answer:
Vibration.
Explanation:
Answer:
vibration best describes it
Explanation:
yoooo help me w this one
Answers
Answer:
0.84kg of gatorade powder
Explanation:
From the question given, we were told that 0.6kg of gatorade powder required 5 gallons of water.
To obtain the mass of gatorade needed for 7 gallons of water, we simply do the following:
0.6kg of gatorade powder required 5 gallons of water.
Therefore, xkg of gatorade powder will require 7 gallons of water i.e
xkg of gatorade powder = (0.6 x 7)/5
xkg of gatorade powder = 0.84kg
Therefore, 0.84kg of gatorade powder will be required.
Which of the following represents C 4 H 10
Answers
Answer:
B
Explanation:
Option be is the only molecular structure with 4 carbon molecules and 10 hydrogen molecules
How does temperature affect the speed with which the solute dissolves? Higher temperature increases the speed of solubility. Lower temperature increases the speed of solubility. A constant temperature increases the speed of solubility. A variable temperature increases the speed of solubility. HELP 17 POINTS
Answers
Answer:
higher temperatures increase the speed of solubility
Explanation:
This is because if the temperature of liquid is high and you place a solute inside it dissolves faster than a low temperature
Higher temperature increases the speed of solubility affect the speed with which the solute dissolves. Therefore, option A is correct.
What is solubility ?The term solubility is defined as the maximum amount of a substance that will dissolve in a given amount of solvent at a specific temperature.
Based on the concentration of solute dissolves in a solvent, solutes are divided into highly Soluble, sparingly Soluble or insoluble substance.
When a solvent is heated, the molecules gain kinetic energy. Because of the increased rapid motion, the solvent molecules collide with the solute more frequently and with greater force. Both factors accelerate the solute's dissolution.
This is because if the temperature of the liquid is high and a solute is placed inside, the solute dissolves faster than if the temperature is low.
Thus, option A is correct.
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Why is corn considered a material resource and an energy resource?
Answers
Answer:
This is because Corn is grown on land and has important values to man .These values include as a source of food for man and animals. It is also used as raw materials for the production of certain goods such as flour etc.
It is an energy resource because fermentation of corn gives rise to ethanol fuel which is used as a source of power to run machines and other equipment.
Which is the solubility product expression for pbcl2(s)
Answers
I need help I don’t really get it
Answers
Answer:
The answer is 17.75%.
Explanation:
We are given [tex]NH_{3}[/tex] (ammonia) as a chemical formula. We want to find the percent composition of the formula.
We are given the atomic masses of each element: [tex]H = 1.008 amu[/tex] and [tex]N = 14.01 amu[/tex]. Then, we need to find out how many atoms are present of each element in the compound.
N has one atom (no subscript present). H has three atoms (subscript of 3 is present).
Now, we simply multiply the masses of each element by the number of atoms present of that element.
[tex]H = 1.008amu * 3atoms = 3.024amu[/tex]
[tex]N = 14.01amu * 1 atom = 14.01 amu[/tex]
Then, we add up those products to get the mass of the formula.
[tex]3.024amu + 14.01amu = 17.034amu[/tex]
Finally, we divide the masses of each element by the mass of the formula to get the percentages of each element present in the compounds.
For hydrogen:
[tex]\frac{3.024amu}{17.034 amu} =0.1775[/tex]
[tex]0.1775 * 100 = 17.75[/tex]
Hydrogen atoms account for 17.75% of the compound.
For nitrogen:
[tex]\frac{14.01amu}{17.034amu} = 0.8225[/tex]
[tex]0.8225 * 100 = 82.25[/tex]
Nitrogen atoms account for 82.25% of the compound.
For an extra step, add up the percentages to make sure you get within 100 ± 0.01. Otherwise, you may have rounded incorrectly or miscalculated somewhere within your work.
Hope this helps!
what carries electric current from the cell to the other components of a circuit.
Answers
Answer:
The different objects that make up a circuit are called components. A circuit must have a power source, such as a battery, and the current flows through a conductor, such as a wire.
Explanation:
I hope that was useful.
Consider the following reversible reaction. CO(g)+2H2(g) CH3OH(g) What is the equilibrium constant expression for the given system?
Answers
Kc=28.7 is the equilibrium constant
How is the equilibrium constant 28.7 explain?
[CO]=26.7g(28.01g/mol)(5.25L)=0.182M
[H2]=2.33g(2.016g/mol)(5.25L)=0.220M
[CH3OH]=8.65g(32.04g/mol)(5.25L)=0.0514M
Kc= x/(0.182−x)(0.220−2x)2
= 0.0514/(0.182−0.0514)(0.220−2(0.0514))2
= 28.7
What is equilibrium constant?a number that expresses the relationship between the amounts of products and reactants present at equilibrium in a reversible chemical reaction at a given temperature.
So, this shows the equilibirum constant is 28.7
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