CHEMISTRY MIDDLE SCHOOL

What does the Aufbau principle state?

Answers

Answer 1
Answer:

Answer:

Electrons will be added to an atom starting from the lowest possible level or sublevel.

Explanation:

Answer 2
Answer:

The Aufbau Principle states that in the ground state of an atom


Related Questions

HIGH SCHOOL

A chemist is likely to do which of the following? . . 1)write a formula for a paint coating . 2)explore land areas for digging of oil wells 3)determine the structure of a plant part for medicinal purposes . 4)test the tensile strength of titanium for use as a prosthetic device.

Answers

"Write a formula for a paint coating" is the one among the following choices given in the question that a chemist is likely to do. The correct option among all the options that are given in the question is the first option or option "1". I hope that this answer has actually come to your help.

Answer:

The correct answers are 1 and 3.

Explanation:

Chemists study the composition and behavior of matter and its interactions with other compounds. Writing a formula for a paint coating is a task performed by chemists working on the development of paints for various purposes. Writing the formula is important to identify the product.

They can also determine the structure of a part of the plant for medicinal purposes, since they study the composition of matter, in this case, the structure of a part of the plant, and its interactions with compounds that affect health, in this case, would be medicinal purposes.

Have a nice day!

HIGH SCHOOL

The chemical symbol for sodium is

Answers

The chemical symbol for sodium is Na
HIGH SCHOOL

Which reaction has the largest positive value of ΔS?. . A.CO2(g) + 3H2(g) → CH3OH(g) + H2O(g). B.2Al(s) + 3S(s) → Al2S3(s). C.CH4(g) + H2O(g) → 3H2(g) + CO(g). D.2S(s) + 3O2(g) → 2SO3(g).

Answers

The reaction has the largest positive value of ΔS is CH4(g) + H2O(g) → 3H2(g) + CO(g). I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.

HIGH SCHOOL

Sports trainers treat sprains and soreness with ethyl bromide. it is manufactured by reacting ethylene with hydrogen bromide: h5sil9512 use bond energies to find the enthalpy change for this reaction

Answers

When ethylene is reacted with hydrogen bromide then formation of ethylene bromide takes place. - 59 kj / mole change in enthalpy for this reaction.

What is enthalpy ?

Enthalpy is a property or state function that resembles energy; it has the same dimensions as energy and is therefore measured in joules or ergs.

The value of enthalpy is solely dependent on the temperature, pressure, and composition of the system, not on its history.

Enthalpy quantifies the amount of heat transmitted during a chemical reaction at constant pressure, whereas heat is a type of energy. This is the main distinction between enthalpy and heat.

Furthermore, since heat is not an inherent property of a system, enthalpy is a function of the state while heat is not. Ethylene molecule react with hydrogen bromide to formed ethylene bromide.

Thus, enthalpy change for this reaction is - 59 kj / mole.

To learn more about enthalpy follow the link below;

brainly.com/question/7827769

#SPJ2

-59 kj/mol exothermic

MIDDLE SCHOOL

State of most nonmetals at room temperature

Answers

Eleven non-metals are gases at room temperature, including oxygen and chlorine. One non-metal, bromine, is a liquid at room temperature. Five non-metalsare solids at room temperature, including carbon and sulphur. Therefore, most would be gases at room temperature. 
They are gases at room temperature.
COLLEGE

Calculate the number of C, H, and O atoms in 1.50 g of glucose, a sugar

Answers

There are 3.011*10²² atoms of C, 6.022*10²² atoms of H, and 3.011*10²² atoms of O.

The Calculation for the number of atoms:

Chemical formula of the glucose: C₆H₁₂O₆

The Molar masses are known for each atom:

atomic mass (C)=12 u

atomic mass (H)=1 u

atomic mass (O)=16 u

Atomic weight (C₆H₁₂O₆)=6(12 u)+12(1u)+6(16 u)=72 u+12u+96 u=180 u.

1 mol of glucose will be 180 g

The molar mass would be: 180 g/ mol

Calculation for number of moles of 1.5 g.

180 g---------------------1 mol

1.5 g----------------------  x

x=(1.5 g * 1 mol) / 180 g≈8.33*10⁻³ moles

From Avogadro's number:

1 mol = 6.022 * 10²³ particles (atoms or molecules)

Calculation for each atom:

1 mol-----------------------6.022*10²³ molecules of glucose

8.33*10⁻³ moles---------------- x

x=(8.33*10⁻³ moles * 6.022*10²³ molecules)/1 mol≈5.0183*10²¹ molecules.

A molecule of glucose has 6 atoms of C, 12 atoms of H, and 6 atoms of O,

The number of atoms of C=(6 atoms/1 molecule)(5.0183*10²¹molecules)≈

3.011*10²²

The number of atoms of H=(12 atoms/1 molecule)(5.0183*10²¹ molecules)≈ 6.022*10²² .

The number of atoms of O=(6 atoms/1 molecule)(5.0183*10²¹ molecules)≈

3.011*10²²

Find more information about Number of atoms here:

brainly.com/question/15356425

Chemical formula of the glucose: C₆H₁₂O₆

We calculate the molar mass:
atomic mass (C)=12 u
atomic mass (H)=1 u
atomic mass (O)=16 u

atomic weight (C₆H₁₂O₆)=6(12 u)+12(1u)+6(16 u)=72 u+12u+96 u=180 u.
Therefore : 1 mol of glucose will be 180 g
The molar mass would be: 180 g/ mol


2) we calculate the number of moles of 1.5 g.
180 g---------------------1 mol
1.5 g----------------------  x

x=(1.5 g * 1 mol) / 180 g≈8.33*10⁻³ moles

we knows that:
1 mol = 6.022 * 10²³ particles (atoms or molecules)

3)We calculate the number of molecules:

Therefore:
1 mol-----------------------6.022*10²³ molecules of glucose
8.33*10⁻³ moles--------        x

x=(8.33*10⁻³ moles * 6.022*10²³ molecules)/1 mol≈5.0183*10²¹ molecules.

4)We calculate the number of C, H and O atoms:
A molecule of glucose have 6 atoms of C, 12 atoms of H, and 6 atoms of O,
number of atoms of C=(6 atoms/1 molecule)(5.0183*10²¹molecules)≈
3.011*10²²

number of atoms of H=(12 atoms/1 molecule)(5.0183*10²¹ molecules)≈
6.022*10²² .

number of atoms of O=(6 atoms/1 molecule)(5.0183*10²¹ molecules)≈
3.011*10²²

Answer: we have 3.011*10²² atoms of C, 6.022*10²² atoms of H, and 3.011*10²² atoms of O.
COLLEGE

Calculate the theoretical oxygen demand (mg/L). of a solution containing 450mg of glucose (C6H12O6). in 2 L of distilled water.

Answers

Answer:

ThOD =239.792 mg/L

Explanation:

Theorical Oxigen demand (ThOD):

is the theoretical amount of oxygen

required to oxidize the organic fraction of a

waste up to carbon dioxide and water.

⇒ C sln = 450 mg C6H12O6 / 2 L H2O = 225 mg/L sln

∴ mm C6H12O6 = 180.156 g/mol

balanced reaction:

  • C6H12O6 + 6O2 → 6CO2 + 6H2O

∴ mol C6H12O6 = 1 mol

⇒ mass C6H12O6 = (180.156 g/mol)( 1 mol) = 180.156 g

∴ the value of ThOD is determined when 180.156 g C6H12O6 consume mass O2 = 6(32) = 192 g Oxygen;  then in a solution of 225 mg/L, you have:

⇒ ThOD = (192/180.156)×225 mg/L

⇒ ThOD = 239.792 mg/L

COLLEGE

An atom with a single electron (i.e. a hydrogen-like atom) has an atomic number z = 3. what is the principal quantum number of the state in which the electron has the same total energy as a ground state electron has in the hydrogen atom?

Answers

Specific heat capacity of a substance is the amount of heat required to raise the temperature by one degree Celsius of one gram of a substance. Therefore, n=3 is the principal quantum number of the state in which the electron has the same total energy as a ground state electron has in the hydrogen atom.

What is Enthalpy?

Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have. Mathematically, Enthalpy is directly proportional to specific heat capacity of a substances.

Mathematically,

The formula for energy in the 1st exited state is given as

E= -13.6/n² ev

for 1st exited state n = 3

E= -13.6/9 ev

=-3.4eV

So, n=3 is the principal quantum number of the state in which the electron has the same total energy as a ground state electron has in the hydrogen atom.

Therefore, n=3 is the principal quantum number of the state in which the electron has the same total energy as a ground state electron has in the hydrogen atom.

To know more about enthalpy, here:

brainly.com/question/24170335

#SPJ2

HIGH SCHOOL

Ammonia is produced by the following reaction. 3H2(g) + N2(g) --------> 2NH3(g)


When 7.00 g of hydrogen react with 70.0 g of nitrogen, hydrogen is considered the limiting reactant because
7.5 mol of hydrogen would be needed to consume the available nitrogen.
7.5 mol of nitrogen would be needed to consume the available hydrogen.
hydrogen would produce 7.5 mol more ammonia than nitrogen.
nitrogen would produce 7.5 mol more ammonia than hydrogen.

Answers

I believe the correct answer from the choices listed above is the first option. When 7.00 g of hydrogen react with 70.0 g of nitrogen, hydrogen is considered the limiting reactant because 7.5 mol of hydrogen would be needed to consume the available nitrogen. The limiting reactant is the reactant which would be consumed first in the reaction. Hope this answers the question. 

Answer: The correct statement is 7.5 mol of hydrogen would be needed to consume the available nitrogen.

Explanation:

To calculate the number of moles, we use the equation:  

  • For Hydrogen:

Given mass = 7 grams

Molar mass = 2 g/mol

Putting values in above equation:

  • For Nitrogen:

Given mass = 70 grams

Molar mass = 28 g/mol

Putting values in above equation:

  • For the given chemical reaction:

By Stoichiometry of the reaction:

1 mole of nitrogen is consumed by 3 moles of hydrogen

2.5 moles of nitrogen is consumed by = of nitrogen gas.

Hydrogen is considered as a limiting reagent because it limits the formation of products and will be totally consumed by a less quantity of excess reagent.

Hence, the correct statement is 7.5 mol of hydrogen would be needed to consume the available nitrogen.

Random Questions