Every orbital in a sub level is singly occupied before any orbital is doubly occupied is the statement of

Because this is a double replacement reaction, the iron and potassium will swap places, giving \(\text{K}_{2}\text{Cl}_{2}\) and \(\text{FeS}\).

The names of these compounds are potassium chloride and Iron(II) sulfide

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The ancient atomic theory was proposed in the 5th century bc by the Greek philosophers Leucippus and Democritus

The measurement can be reported with three significant figures as follows: 3.90 mm.

The measurement can be reported with three significant figures as 3.90 mm. The record is a reading from a ruler that shows the specific point where the red line meets and the exact measurement is in three significant figures because none of them can be disregarded.

So, the accurate reading is 3.90. When the accurate reading is used, it ensures that the result of the measurement will be as expected.

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Answer:

403.2 grams of oxygen

Explanation:

According to the balanced chemical equation, 2C2H6 + 7O2 —> 4CO2 + 6H2O, 4 moles of carbon dioxide (CO2) are produced for every 7 moles of oxygen (O2) that react. Therefore, if 7.2 moles of carbon dioxide are produced, the number of moles of oxygen that react is (7.2 moles CO2) * (7 moles O2 / 4 moles CO2) = 12.6 moles O2.

Since the molar mass of oxygen is approximately 32 g/mol, the mass of oxygen that reacts is (12.6 moles O2) * (32 g/mol) = 403.2 g. Therefore, 403.2 grams of oxygen react in order to produce 7.2 moles of carbon dioxide.

Answer:

1 mol CO2

Explanation:

3 mol CH4 * \(\frac{1 mol CO2}{1 Mol CH4}\) = 3 mol of CO2

2 mol O2 * \(\frac{1 mol CO2}{2 mol O2}\) = 1 mol CO2

For Example: You make steak dinners and each plate has to have 1 steak and 2 potatoes. You have 3 steaks (CH4) but only 2 potatoes (O2). With only the steak you could make three dinners, but you are limited to only be able to make one plate (Mole of CO2) because you only have 2 potatoes.

The amount of volume of KOH solution that should be added to make 500mL of a 0.300M solution is 200mL.

The volume of a solution given the concentration can be calculated using the following expression;

CaVa = CbVb

Where;

According to this question, we are to calculate how many mL of a 0.75 M OH solution that should be added to a 500 mL flask to make 500 mL of a 0.300 M KOH solution.

0.75 × Va = 500 × 0.3

0.75Va = 150

Va = 150/0.75

Va = 200mL

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0.25 kg of water losing heat will generate about 83.39 kJ when frozen.

The heat released by a substance when it freezes is expressed by the formula:

Q = m × Lf

where

Q is the released heat,

m is the mass of the substance, and

Lf is its latent heat of fusion. for water, this value is 333.55 kJ/kg.

Q = 0.25 kg * 333.55

Q = 83.5 kJ

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If the students look out a window for 5 min. and record the number of vehicles that pass, the type of vehicle and color of the vehicle, then the students are observing (Option D is correct).

The scientific method is a series of sequential steps by which we can collect empirical evidence about a scientific question, and it involves observation and experimentation.

In conclusion, If the students look out a window for 5 min. and record the number of vehicles that pass, the type of vehicle and color of the vehicle, then the students are observing (Option D is correct).

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Answer:

down below

Explanation:

The police's influence can happen based on a response to a problem. An example is when the police are called because of a thief child. If the police handles the situation correctly-using reasonable force, if necessary, and reading them their rights- the public will perceive the police in a good light or way. If the police use gross misconduct and do not go by the book, then they will be perceived as an enemy or in a bad light or way.

Answer:

r=3

Explanation:

Answer:

rc

Explanation:

You would recover 36.525g of NaCl after evaporating all of the water.

To find the grams of NaCl that would be recovered after evaporating all the water, we can use the following formula:

mass = moles * molar mass

Where:

Moles = Molarity * Volume

Molarity = 0.250 M

Volume = 2500.0 mL = 2.5 L

Molar mass of NaCl = 58.44 g/mol

mass = 0.250 M * 2.5 L * 58.44 g/mol

mass = 36.525 g

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Answer:

Ammonia is limiting reactant

Amount of oxygen left  = 0.035 mol

Explanation:

Masa of ammonia = 2.00 g

Mass of oxygen = 4.00 g

Which is limiting reactant = ?

Balance chemical equation:

4NH₃ + 3O₂     →     2N₂ + 6H₂O

Number of moles of ammonia:

Number of moles = mass/molar mass

Number of moles = 2.00 g/ 17 g/mol

Number of moles = 0.12 mol

Number of moles of oxygen:

Number of moles = mass/molar mass

Number of moles = 4.00 g/ 32 g/mol

Number of moles = 0.125 mol

Now we will compare the moles of ammonia and oxygen with water and nitrogen.

                      NH₃          :            N₂

                        4             :             2

                      0.12           :           2/4×0.12 = 0.06

                      NH₃         :            H₂O

                        4            :             6

                        0.12       :           6/4×0.12 = 0.18

                       O₂            :            N₂

                        3             :             2

                      0.125        :           2/3×0.125 = 0.08

                        O₂           :            H₂O

                        3              :             6

                        0.125       :           6/3×0.125 = 0.25

The number of moles of water and nitrogen formed by ammonia are less thus ammonia will be limiting reactant.

Amount of oxygen left:

                        NH₃          :             O₂

                           4            :              3

                           0.12       :          3/4×0.12= 0.09

Amount of oxygen react = 0.09 mol

Amount of oxygen left  = 0.125 - 0.09 = 0.035 mol

The color of the object appears as yellow/orange.

The visible light spectrum spans a wavelength range of 400 to 700 nanometers (nm), with shorter wavelengths appearing as blue or violet and longer wavelengths as red.

This object is absorbing light with wavelengths between 430 and 400 nm, indicating that it is absorbing light that is visible in the blue and violet spectrum.

We know that this color that we see is actually a complementary color to blue/violet from the color wheel.

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From the calculations, the change in energy is - 190 J.

From the first law of thermodynamics, the energy is neither created nor destroyed but is transformed from one form to another.

From the law;

U = q + w

U = internal energy

q = heat

w = work

Since work is done on the surroundings and the gas absorbs heat then;

U = 132 J - 322 J

U = - 190 J

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Answer:

I'm pretty sure c......

Answer is B

The friction causes the ball to lose energy on carpets, which makes the ball bounce less. On hard floors, not as much thermal energy is lost, which is why it bounces higher.

Answer:

See picture below

Explanation:

In the attached picture, you have the mechanism of all this reaction.

In the first step, as this is Friedel Craft acylation, we need to use either AlCl₃ or FeCl₃. So, this compound (I will use FeCl₃) will attach to the Chlorine group of the CH₃COCl.

In the second step, the whole CH₃CO is attached to the furan, because of the attack of the double bond of the ring.

After this, it occurs several resonance structure, to give a more stable structure, and the Hydrogen in the 2 position is substracted to give the final product of acylation.

Hope this helps.

Answer:

The answer is option c.

I hope this helps you.

Answer:

compared to sodium, silicon has a higher ionization energy meaning it takes more energy to remove electrons.

Explanation:

hope this helps

can u please give me and Brainlist

Answer:

Sound waves enter the outer ear and travel through a narrow passageway called the ear canal, which leads to the eardrum. The eardrum vibrates from the incoming sound waves and sends these vibrations to three tiny bones in the middle ear. These bones are called the malleus, incus, and stapes.

Explanation:

i don't know what are you talking about^_^

Answer:

The law of conservation of energy states that energy can neither be created nor destroyed - only converted from one form of energy to another.

Explanation:

This means that a system always has the same amount of energy unless it's added from the outside. is the total internal energy of a system.

The student's method for preparing pure crystals of copper sulfate contains errors and does not produce the desired outcome.

Use copper oxide instead of calcium carbonate: The student should add copper oxide (CuO) to the hydrochloric acid instead of calcium carbonate. Copper oxide reacts with hydrochloric acid to form copper chloride, which can then be converted to copper sulfate through a subsequent reaction with sulfuric acid.

Add sulfuric acid to the copper chloride solution: After the copper chloride solution is formed, the student should add sulfuric acid to it. This reaction between copper chloride and sulfuric acid will yield copper sulfate and hydrochloric acid. The student should ensure that the correct stoichiometric ratio is maintained to maximize the yield of copper sulfate crystals.

Crystal formation: The student should allow the solution to cool slowly after the reaction with sulfuric acid. This promotes the formation of larger, well-defined copper sulfate crystals.

Filtration and drying: Once the crystals have formed, the student should filter the solution to separate the solid crystals from the remaining liquid. The filtered crystals should then be thoroughly dried to remove any remaining water, resulting in pure copper sulfate crystals.

By following these improvements, the student can obtain pure crystals of copper sulfate.

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The mass of carbon dioxide produced by the complete combustion of 48.0g of hexane is 147.35g.

The mass of a substance can be calculated by using the stoichiometry approach.

The balanced equation of the complete combustion of hexane is as follows:

2C6H14(g) + 19O2(g) → 12CO2(g) + 14H2O(g)

48g of hexane to moles is calculated as:

48g ÷ 86g/mol = 0.56 mol

2 moles of hexane produces 12 moles of CO2

0.56 mol of hexane will produce 0.56 × 12/2 = 3.35 mol

Next, we convert 3.35 moles of CO2 to mass as follows:

3.35 moles × 44g/mol = 147.35g

Therefore, the mass of carbon dioxide produced by the complete combustion of 48.0g of hexane is 147.35g.

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The octet rule describes an atom's propensity to favour eight electrons in its valence shell. Atoms with fewer than eight electrons are more likely to interact with one another and create more stable molecules.

Based on the observation that the atoms of the main group elements tend to participate in chemical bonding in a way that each atom of the resulting molecule has eight electrons in the valence shell, this theory was developed. Only the core group elements are subject to the octet rule.

Because both atoms receive a full valence shell as a result of the sharing, the octet rule is essential in covalent bonding.

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The yield energy of the natural meta magnesium l, as cast, is set 3,000 psi (20 MPa) with tensile energy of 12,000 psi (20 MPa), elongation of 6 in step with cent, and Brinell hardness.

Suitably alloyed magnesium gives cloth with a extensive variety of mechanical properties.The low ductility is related to the incapability of hexagonal-close-packed (hcp) Mg to deform plastically withinside the crystallographic 〈c〉 direction, that's finished in the main through dislocation flow at the pyramidal II aircraft with the 〈c + a〉 Burgers vector.

Magnesium has low ductility, that is, it can not be stretched very a great deal earlier than it breaks. It additionally suggests uncommon behavior, inclusive of a regime of growing energy with growing temperature, that's the other of maximum metals”, stated Prof. Curtin.

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Answer:

It is a step by step process

Explanation:

You cannot do the experiment and lab report without following the steps

Hope this is correct and helpful

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Answer:

Increasing the temperature of 1 mol of C8H18(l) requires more energy

Explanation:

To answer this question, we need to define molar heat capacity that is the amount of heat required to increase in 1K the temperature of 1 mole of substance.

That means the substance with higher molar heat requires more energy to increase its temperature

Molar heat of octane, C8H18 is 255.68J/Kmol

Molar heat of water is 75.38J/Kmol

That means increasing the temperature of 1 mol of C8H18(l) requires more energy

Answer: empty space or vacuum

Explanation: The empty space between the atomic cloud of an atom and its nucleus is just that: empty space, or vacuum.

Answer:

Empty space

Explanation:

The empty space between the atomic cloud of an atom and its nucleus is just that: empty space. That's the simple answer, however, sub-atomic particles such as electrons, protons and neutrons need to be treated as quantum objects. They have a wave function which can be thought of as the 'spread' in the particle's location. Electrons are 'spread out' quite a bit in their orbits about the nucleus. In fact, the wave-functions for electrons in s-orbitals about a nucleus actually extend all the way down into the nucleus itself. In this sense, then, the space between the electrons and the nucleus isn't really 'empty.' The electrons and the protons/neutrons are constantly interacting, either electromagnetically or through the weak force. In quantum field theory we would say that these particles are constantly exchanging photons (in the case of electromagnetism) or heavy gauge bosons (in the case of the weak force). So you might say that the otherwise 'empty' space between the electrons and nucleus is 'filled' with these quanta carrying forces.

Hope this is helpful to you!

The kJ of the energy absorbed for the every mole of the carbon reacted is 104.8 kJ.

The chemical equation is as :

2C + 2H ---> C₂H₄   ,     ΔH = + 52.4 kJ/mol

The ΔH is the enthalpy change that is determined by the subtracting the energy of the reactants to the products.

The  ΔH = energy of the products - energy of the reactants

The expression for the energy is as :

q = n ΔH

Where,

n = number of the moles

ΔH = enthalpy change

The kJ of the energy absorbed for the every mole of the carbon reacted :

q = 2 mol × 52.4 kJ/mol

q = 104.8 kJ

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Answer:

              4.155 × 10²⁴ Atoms

Explanation:

Formula used,

Number of Atoms = Moles × 6.022 × 10²³ Atoms.mole⁻¹

Putting value of moles,

Number of Atoms = 6.90 mole × 6.022 × 10²³ Atoms.mole⁻¹

Number of Atoms = 4.155 × 10²⁴ Atoms