An element with 20 protons and 20 electrons gains one electron. This gained electron goes into the 3d-orbital.
What are electrons?Electrons may be defined as the type of sub-atomic particles which are consistently revolving around the nucleus of an atom. These particles are negatively charged in nature. It may be thought that J.J. Thomson discovered the electrons for the very first time.
The electronic configuration of an element that possesses 20 electrons is [tex]1s^2 2s^22p^63s^23p^64s^2[/tex]. So, the 4s orbital is completely filled. Now, the gained electron must enter the 3d orbital in order to systematize the electronic configuration. The electrons will fill up the five 3d orbitals and finally the three 4p orbitals to complete energy level 4.
Therefore, an element with 20 protons and 20 electrons gains one electron. This gained electron goes into the 3d-orbital.
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Challenge What mass of methane (CH4) must be burned in order to liberate 12,880 kJ
of heat? Refer to Table 3.
HW
The mass of methane (CH₄) which must be burned in order to liberate 12,880 kJ of heat is 231.9 g
A combustion reaction is a reaction in which a substance reacts with the oxygen and releases the energy in the form of light and heat.
Given data :
Heat energy liberated = 12,800 kJ
Δ Combustion = 891 kJ/mol
To calculate the mass of methane (CH₄) -
Number of moles of methane burned = Heat energy used
Δ Combustion
Number of moles of methane burned = 12880
891
Number of moles of methane burned = 14.455 mol
Since, Molar mass of methane is 16.043 g/mol
So, Mass of methane = Number of moles of x Molar mass of methane
methane burned
Mass of methane = 14.455 mol x 16.043 g/mol
Mass of methane = 231.9 g
Therefore, the mass of methane which must be burned is 231.9 g.
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An average sample of lithium contains 7.5% lithium-6 and 92.5% lithium-7. Lithium-6 has an atomic mass of 6.015 amu and lithium-7 has an atomic mass of 7.016 amu. What is the average atomic mass of a sample of lithium? A B C D 6.09 amu 6.49 amu 6.52 amu 6.94 amu
The average atomic mass of Lithium is found to be 6.94 amu. Thus, (d) is the correct answer.
Atomic mass is the total number of protons and neutrons present in the nucleus of the atom when it is at rest. On comparison with protons and neutrons, electrons have negligible mass and thus atomic mass is the total sum of protons and neutrons.
Given:
% abundance of Li-6, Li6 = 7.5%
% abundance of Li-7, Li7 = 92.5%
Atomic mass of Li-6, m6 = 6.015 amu
Atomic mass of Li-7, m7 = 7.016 amu
To find:
Average atomic mass = ?
Formula:
Average atomic mass, [tex]Avg = \frac{(Li6 * m6) + (Li7 * m7)}{100}[/tex]
Avg = [tex]\frac{(7.5 * 6.015) + (92.5 * 7.016)}{100}[/tex]
Avg = (45.1125 + 648.98) / 100
Avg = 694.0925 / 100
Avg = 6.940 amu
Result:
Therefore, 6.94 amu is the average atomic mass of Lithium.
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which is more reactive hydrogen or Oganesson based on Electron affinity
The negatively charged atoms are known to show the electron affinity. Hydrogen is more reactive than oganesson based on electron affinity.
What is electron affinity ?The amount of energy released when an electron is added to a neutral atom to create a negatively charged ion is known as electron affinity in chemistry.
Due to the difficulty in determining atoms' electron affinities, values are only known for a small number of chemical elements, primarily halogens.
Similar towards how chlorine can achieve the configuration of noble gases and become an electronegative ion, hydrogen has a high attraction for electrons, becoming the hydrogen anion and obtaining the stable configuration of helium.
The first synthetic element to belong to group 18 (the noble gases), oganesson has the potential to be substantially more reactive than the other members of that group.
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Why is there no reaction with the following; Aluminium oxide + copper
How many significant figures are in the measurement 0.03802 mL?
Answer:
5
Explanation:
3 6 5 7 0
help me nobody seems to know the answer to this
B. The MOST plausible prediction and explanation of the ending mass is 3g of (AgCl + NaBr); matter is conserved so the total mass will be the same in the beginning and end.
What is the law of conservation of matter?
The law of conservation of matter states that mass cannot be created nor destroyed, but can be converted from one form to another.
When the law of conservation of matter or mass is applied in a chemical reaction we will observe the following;
the mass of the reactants and mass of products are conservedthe total mass of the reactants is equal to the total mass of the producteach component of the reaction is conservedno new element is createdFrom the given chemical reaction;
2 g of NaCl + 1 g of AgBr = ?AgCl + ? NaBr
Based on the law of conservation of matter, the total mass of the reactants (3 g) must be equal to the total mass of the product (3 g) because matter is conserved.
Thus, the MOST plausible prediction and explanation of the ending mass is 3g of (AgCl + NaBr); matter is conserved so the total mass will be the same in the beginning and end.
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A student burnt a metal A
Answer:
Wait what, howd he do that
what would you say to a classmate who said that he wanted to fulfill his science requirement by taking environmental science to get out of chemistry
The most important to know for those who wanted to fulfill science requirements by taking environmental science and avoiding chemistry is that this field is fundamental to understand the real world.
Why Chemistry is fundamental in environmental sciences?Chemistry is fundamental in environmental sciences because we need to know all forces that bond materials, atoms and objects in nature, which can only be achieved by having a real consideration of chemistry.
In conclusion, the most important to know for those who wanted to fulfill science requirements by taking environmental science and avoiding chemistry is that this field is fundamental to understand the real world.
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Put the following elements into the correct order from smallest to largest radius. Al, Ga,
Br, I
From Smallest to Largest:
Br
I
Al
Ga
Which option describes the particles of water as the liquid water actively boils?
(1 point)
Responses
The particles will have the same average kinetic energy and the same temperature during boiling.
The particles will lose kinetic energy and increase temperature during boiling.
The particles will have the same average kinetic energy and a decrease in temperature during boiling.
The particles will lose kinetic energy and decrease temperature during boiling.
2.
What does temperature measure? (1 point)
Responses
the empty space between the particles
the average kinetic energy of the particles
the heat of the particles
the total energy of the particles
3.
Which is the best interpretation of the two flat portions of the graph?
(1 point)
Responses
These show where kinetic energy is increasing.
These show where changes of state are occurring.
These show where temperature is 0ºC.
These show where thermal energy does not exist.
The particles will lose kinetic energy and increase the temperature during boiling. Temperature measures the heat of particles. The flat portions show where kinetic energy is energy.
What is kinetic energy?
Kinetic energy is a type of energy that a moving object or particle has. An item accumulates kinetic energy when work, which involves the transfer of energy, is done on it by exerting a net force.
A moving object or particle has kinetic energy, which relies on both its mass and its rate of motion. The kind of motion might be vibration, rotation on an axis, translation (or travel along a path from one point to another), or any combination of these.
Therefore the correct options are 1- B, 2-B, and 3-A.
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Suppose naoh standardization of khp determined that a volume of 25. 00 ml naoh has a concentration of 0. 049 m. Suppose 22. 20 ml of khp was used to get to the endpoint in this standardization. What is the mass of khp dissolved in 50. 00 ml of the standardization khp titrant?.
Standardization titrant was made by dissolving 0.5634 g of potassium hydrogen phthalate (KHP) in 50.00 mL of water.
1 mol of KHP will react with 1 mol of NaOH to form 1 mol of mixed salt and 1 mol of water. Based on this molar ratio, the number of moles of NaOH will be equal to the number of moles of KHP in the standardization titrant.
c = n/V, so n = c * V = 0.049 M * 0.025 L = 0.001225 mol of NaOH and KHP
This result can help us calculate the amount of KHP present in the whole 50.00 mL of the titrant:
22.20 mL : 0.001225 mol = 50.00 mL : X
X = 0.001225 mol * 50.00 mL / 22.20 mL = 0.002759 mol
Following that, we can use the KHP molar mass (204.22 g/mol), to get to the mass of it (in grams) dissolved in the sample:
n = m/M, so m = n * M = 0.002759 mol * 204.22 g/mol = 0.5634 g
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How much energy is needed to raise the temperature of 5.0 grams of lead from 25°C to 35°C? [specific heat (c) = 0.129 J/(g•°C)]
Q=C x M x ^ T
The amount of energy that is needed to raise the temperature of 5.0 grams of lead from 25°C to 35°C is 6.45J.
How to calculate energy?The energy of a substance can be calculated by using the following formula:
Q = mc∆T
Where;
Q = quantity of heat absorbed or releasedm = mass of substancec = specific heat capacity∆T = change in temperature (°C)According to this question, 5.0 grams of lead needs to be raised from 25°C to 35°C, the amount of energy needed can be calculated as follows:
Q = 5 × 0.129 × {35°C - 25°C}
Q = 6.45J
Therefore, the amount of energy that is needed to raise the temperature of 5.0 grams of lead from 25°C to 35°C is 6.45J.
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please help will give brainlist!!! POINTS: 30
Answer:
Test the water with an actual test or put something that would react to acid in water to test it.
Explanation:
test the water for acidic contents
Claim- the water is acidic
Evidence- the test said it had an acidic composition
conclusion- the water is acidic
Solution a is hypotonic with respect to solution b. What will happen when a cell from solution b is placed in solution a?.
When a cell is placed in a hypotonic solution (Solution A) water enters the cell toward the area of higher solute concentration. Hence, the cell gains water and swells up which increases the internal pressure.
A hypotonic solution is one in which the concentration of solutes is higher within the cell than outside it, whereas a hypertonic solution is one in which the concentration of solutes is higher outside the cell than inside it.
As a result, when a cell is initially placed in Solution B, which is hypertonic compared to Solution A, water will leak out of the cell and the cell will shrink.
Next, this cell will be moved to Solution A, which is hypotonic relative to Solution B, and at this point, the concentration of solute inside the cell is larger than that outside of it, resulting in less solute and more water in the solution. Due to the increased water content outside the cell, there is a net migration of water from the outside into the cell. Therefore, the cell absorbs water and swells up, resulting in a rise in internal pressure.
Note: Water/solvent always goes from a higher concentration to a lower concentration.
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the reaction a 2b → c is found to be first order with respect to both a and b. when the concentration of a is 0.200 m and the concentration of b is 0.400 m, the reaction rate is 0.00700 m/s. what is the numerical value of k
Option E) In the reaction A+ 2B-C that is found to be first order with respect to both a (0.200 m concentration and b (0.400 m concentration) the numeric value of k is 0.0875
What is Concentration?Concentration in chemistry terms is calculated by dividing a constituent's abundance by the mixture's present total volume.
Mass concentration, molar concentration, number concentration, and volume concentration are four different categories that can be described in a mathematical description.
A + 2B → C
Rate = K [A] [B]
Here,
[A] = 0.2 M [B]
⇒ [A] = 0.4 M
rate = 0.007 M/s
Therefore, rate = K [A] [B]
⇒ 0.007 = K (0.2) (0.4)
⇒ K = 0.0875 M^(-1) S^(-1)
Thus, option E is correct.
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Complete question
The reaction A+ 2B-C is found to be first order with respect to both A and B. When the concentration of A is 0.200 M and the concentration of B is 0.400 M, the reaction rate is 0.00700 M/s. What is the numerical value of k for this reaction (with appropriate units where time is in seconds and concentration is in M, as needed).
A) 0.0438
B) 0.0140
C) 11.4
D) 5.60 x 10^(-4)
E) 0.0875
How many molecules are in 60 mg of vitamin C: C6H8O6 ?
The number of molecules in 60 mg of vitamin C: C6H8O6 is 2.053 × 10¹⁸ molecules.
How to calculate number of molecules?The number of molecules in a substance can be calculated by multiplying the number of moles in that substance by Avogadro's number.
Firstly, the number of moles in 60mg of vitamin C must be calculated as follows:
Molar mass of C6H8O6 = 12(6) + 1(8) + 16(6) = 176g/mol
number of moles = 0.06g ÷ 176g/mol = 3.41 × 10-⁴moles
Number of molecules = 3.41 × 10-⁴moles × 6.02 × 10²³
Number of molecules = 2.053 × 10¹⁸ molecules
Therefore, the number of molecules in 60 mg of vitamin C: C6H8O6 is 2.053 × 10¹⁸ molecules.
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Circle or underline the correct answer
3- True or false: it is OK to leave your bags in the aisle
4- True or false: horseplay is fine before or after the lab 5- True or false: you do not need goggles or gloves for lab
6- True or false: you do not need to wash your hands after lab
7- True or false: it is OK to eat and drink in a lab class
8- True or false: it is OK to pour chemicals back into the bottle it came from
9-True or false: microscopes can be handled with one hand only
10-True or false: you do not need to read the instructions before lab
11-True or false: respect safety rules and guidelines
Answer:
3- True or false: it is OK to leave your bags in the aisle
4- True or false: horseplay is fine before or after the lab
5- True or false: you do not need goggles or gloves for lab
6- True or false: you do not need to wash your hands after lab
7- True or false: it is OK to eat and drink in a lab class
8- True or false: it is OK to pour chemicals back into the bottle it came from
9-True or false: microscopes can be handled with one hand only
10-True or false: you do not need to read the instructions before lab
11-True or false: respect safety rules and guidelines
Explanation:
I bolded the ones that it's supposed to be. You're teacher gave you a lot of false's though
The ocean floor is largely made of______ formed by magma from earth’s mantle that cools and hardens
The ocean floor is largely made of Volcanic rock formed by magma from earth’s mantle that cools and hardens.
What is ocean floor called?The ocean's bottom is referred to as the seabed, seafloor, ocean floor, and ocean bottom. All oceanic floors are referred to as "seabeds." The various types of sediment that make up practically the whole ocean floor include mud, sand, and gravel.
What materials compose the ocean floor?Deposits of minerals we need every day, such copper, zinc, nickel, gold, silver, and phosphorous, can be found on the seafloor. These deposits are nodules on silt from the abyssal plain that are typically 3 to 10 centimetres (1 to 4 inches) in diameter and appear as crusts on volcanic and other rocks.
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If the average speed of a water molecule at 25°c is 640 m/s, what is the average speed at 100°c?.
The average speed of a water molecules at 25°C is 640 m/s, the average speed at 100 °C is 715.8 m/s.
The average speed of molecules is defined as the average speed of all individual the molecules. this mean it is equal to sum of speed of all the molecule divide by total no. of molecules.
Average speed ( V ) = [tex]\sqrt{8RT / \pi M}[/tex]
given :
Temperature of molecule T1 = 25°C = 298 K
Average velocity of water at 25°C ,V1 = 640 m/s
Temperature T2 = 100°c = 373 K
Average velocity of water at 100°C ,V2 = ?
now, computed the data, we get
V2 / V1 = [tex]\sqrt{T2 / T1}[/tex]
V2 / 640 m/s = [tex]\sqrt{373 K / 298 K}[/tex]
V2 = 715.8 m/s.
Thus,The average speed of a water molecules at 25°C is 640 m/s, the average speed at 100 °C is 715.8 m/s.
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How many Pa are equivalent to 3.05 atm?
Answer:
309041.2
Explanation:
Which of the following scenarios accurately describes magnitude and direction? (1 point)
A car traveling northward with 5 kN of force could be brought to a stop by a southward force of 10
O
kN.
A force of equal magnitude that also travels northward would not stop a force traveling the same
direction.
A car traveling northward with 5 kN of force could be brought to a stop by a southward force of 5
KN.
A car traveling northward with 5 kN of force could be brought to a stop by a southward force of 5
kg.
O
Answer:
Explanation:
1.) Which statement best describes force?
answer: Force is a vector quantity that measures both direction and magnitude of a push or pull on an object.
2.) A soccer ball is traveling downfield with a force of 1.2 kN and strikes another soccer ball that is stationary. Which of the following describes the result of the collision?
answer: The stationary soccer ball will begin moving downfield and the ball that struck it will slow down.
3.) Which of the following scenarios accurately describes magnitude and direction?
answer: A car traveling northward with 5 kN of force could be brought to a stop by a southward force of 5 kN.
4.) What is force directly proportional to?
answer: the acceleration and mass of an object
5.)Two ropes are being used to suspend a box. Each rope is exerting 5 N of upward force. If the forces are balanced and the box is stationary, how much force is being exerted by the box itself and in which direction?
answer: The box exerts 10 N of force downward.
Hope this helps :)
A car traveling northward with 5 kN of force could be brought to a stop by a southward force of 5 kN is accurate scenario to explain magnitude and direction.
Force is a vector quantity that measures both direction and magnitude of a push or pull on an object . It can also be explain as , force is an external agent capable of changing a body’s state of rest or motion. It has a magnitude and a direction.
The direction towards which the force is applied is known as the direction of the force, It is represented by F and unit is Newton & S.I. unit is kg ·m/s².
F = ma
Where, m is the mass of body and a is the acceleration of the body .
Acceleration of a body or an object is given as, the rate of change of the velocity of an object with respect to time. The unit of acceleration is m/s².
a = Δv/Δt
Where , Δv is the change in acceleration and Δt change in time .
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sodas typically contain flavorings, coloring agents, sugar, and carbon dioxide dissolved in water. the best term to describe this mixture would be . view available hint(s)
Sodas typically contain flavorings, coloring agents, sugar, and carbon dioxide dissolved in water, so the best term to describe this would be aqueous solution.
What are Aqueous solutions?Aqueous solutions are the solutions that contain liquid water in them as the solvent that is used to dissolve the various solutes.
When we mix this sugar, flavorings, coloring agents, and carbon dioxide together, we have the aqueous solution of soda.
The word aqueous, which is derived from the Greek aqua, denotes that it is dissolved in or related to water.
It is shown in chemical equations by adding (aq) to the relevant chemical formula.
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Complete Question
Sodas typically contain sugar, flavorings, coloring agents, and carbon dioxide dissolved in water. The best term to describe this mixture would be _____.
A) an aqueous solvent
B) an aqueous solution
C) a solution
D) a solvent
E) a solute
Which sentence describes an item that would help this geologist make better observations about the rocks while in the field?
Answer:
Magnifying glass or a special device that resembles a handheld microscope, used to observe ink placement of printers
Explanation:
help! 10 points! will give brainlist!
Water molecules can react with each other according to the equation below:
2H2O ⇌ H₃O⁺ + OH⁻
If H₃O⁺ is added to 2H2O ⇌ H₃O⁺ + OH⁻ , the equilibrium will shift right to the product.
If H₃O⁺ is taken away from 2H2O ⇌ H₃O⁺ + OH⁻, the equilibrium will shift left to the product. If OH⁻ is added to 2H2O ⇌ H₃O⁺ + OH⁻ the equilibrium will shift left to the reactants If OH⁻ is taken away from 2H2O ⇌ H₃O⁺ + OH⁻, the equilibrium will shift right to the reactantWhat is equilibrium?Equilibrium can be defined as the state in which both reactants and products are present in concentrations and they have no chances to change with time. It is also the state of a reaction in which the rates of the forward and reverse reactions are the same. This means there is no observable change in the properties of the system.
So therefore, water molecules can react with each other according to the equation below:
2H2O ⇌ H₃O⁺ + OH⁻
If H₃O⁺ is added to 2H2O ⇌ H₃O⁺ + OH⁻ , the equilibrium will shift right to the product
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red gold is a gold‑copper alloy used to make jewelry. a piece of jewelry made of red gold weighs 9.67 g and has a volume of 0.620 cm3 . gold has a density of 19.3 g/cm3 and copper has a density of 8.96 g/cm3 . calculate the percentage by mass of each metal in the jewelry. assume the total volume of the jewelry is the sum of the volumes of the two metals it contains.
Red gold weighs 9.67 g and has a volume of 0.620 cm3 . gold has a density of 19.3 g/cm3 and copper has a density of 8.96 g/cm3 percentage by mass of each metal in the jewelry is 94,4732031% of gold and 5,5267969% of copper
Here given data is
Red gold weighs = 9.67 g and volume of gold = 0.620 cm3 and density of gold = 19.3 g/cm3 and density of copper = 8.96 g/cm3
So here we have to calculate percentage by mass = ?
19.3x + 8.96y = 8.62
x + y = 0.475 this is the volume
x = 0,421947674 and y = 0,0530523256
So, 19.3 × 0,421947674 × 100% / 8.62 = 94,4732031% of gold
and 100-94,4732031 = 5,5267969% of copper
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Into what protein structure is spider silk found?
A. primary
B. secondary
C. tertiary
D. quaternary
Answer:
Into what protein structure is spider silk found?
= Primary structure
I HOPE IT HELP YOU
explain breifly why the 1st ionization energy of "B" is less than of "Be" less than of the atomic number of "B" is greater than that of "Be"
Explanation:
B → Boron → Atomic number 5
Be → beryllium → Atomic number 4
B - Hybridization → 1S² 2S² 2P¹
[tex] \sf Boron - \boxed{↿↾} \: \boxed{↿↾} \: \boxed{ \small↾ }\huge\boxed{ }\huge\boxed{ }[/tex]
Be - Hybridization → 1S² 2S²
[tex] \sf Beryllium →\boxed{↿↾} \: \boxed{↿↾} \: \huge\boxed{ }\huge\boxed{ }\huge\boxed{ }[/tex]
from above data we can see that the outermost orbital of Beryllium i.e. 2S is fully filled & that of boron have 1 electron in 2P orbital. It will require more energy to remove one electron from beryllium Because it will disturb the stability, on other hand the boron will lose one electron easily to attain full filled outermost electron hence it will require less energy for 1st ionization.
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How are particles in a solid like people sitting in a movie theater?
A substance freezez at -58°C. Therefore, the substance melts at
Answer:58°C
Explanation:
I believe this is the answer
using standard electrode potentials, calculate δg∘ and use its value to estimate the equilibrium constant for each of the reactions at 25 ∘c. part a pb2 (aq) mg(s)→pb(s) mg2 (aq)
The equilibrium constant can be obtained using ΔG°rxn = -RT lnK.
On the basis of this, 2H+ + 2e- → H2(g) reduction.
Therefore E° = 0V
Pb2+ + 2e- ⇄ Pb(s) - 0.126
Mg2+ + 2e- ⇄ Mg(s) -2.372
For total E°cell potential,
E°cell = Ered - Eoxd
Eoxd = -Ered of the one being oxidised
E°cell = -2.372 - (-0.126) = -2.246
E°cell = -2.246 V
Thus, calculating dG:
dG = -n x F x E°cell
dG = -2*96500*(-2.246)
=433478 J/mol
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