Can you please help me

An atomic mass unit is defined as 1/12 th of the mass of carbon-12 atom.

The mass of an atom is mainly due to its protons and neutrons in the nucleus.

Weight of a proton is 1.6 x 10^-27 kg

Weight of a neutron is 1.6 x 10^-27kg

However weight of an electron is 9 x 10^-31kg and hence is negligible in calculation of amu

A chlorine atom has 17 protons in its nucleus and 18 neutrons in its nucleus

Its atomic number is 17

Amu weight of Cl= weight of protons+ weight of neutrons

        =17+18

        =35amu

Hence the average atomic mass unit of chlorine atoms will be 35 amu

Disclaimer:

The value is taken for easier calculation and is not accurate upto 3 decimals

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The reaction that will occur at the same time as the formation of ferric hydroxide will be [tex]Fe(OH)_3 + 3HCI --- > FeCl_3 + 3H_2O[/tex].

A reversible reaction is a reaction that proceeds both forward and backward at the same time.

In other words, it is a reaction in which as the reactants react to form products, the products simultaneously react to form reactants.

Thus, looking at the original forward reaction:

[tex]FeCl_3 + 3H_2O --- > Fe(OH)_3 + 3HCI[/tex]

Ferric chloride reacts with water to form ferric hydroxide and hydrochloric acid. Since the reaction is reversible, the ferric hydroxide and hydrochloric acid formed will simultaneously be reacting to form the reactants.

In other words, the reaction that will occur at the same time as the formation of ferric hydroxide will be:

[tex]Fe(OH)_3 + 3HCI --- > FeCl_3 + 3H_2O[/tex]

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Answer:

a

Explanation:

because this could be down to coincidences whereas the others could be explained with scientific experiments

Answer:

A

Explanation:

Must be testable - A is not

Explanation:

In a chemical reaction, the atoms and molecules that interact with each other are called reactants. In a chemical reaction, the atoms and molecules produced by the reaction are called products. In a chemical reaction, only the atoms present in the reactants can end up in the products.

Answer:

In a chemical change, the atoms in the reactants rearrange themselves and bond together differently to form one or more new products with different characteristics than the reactants. When a new substance is formed, the change is called a chemical change.

Explanation:

Chemical changes occur when bonds are broken and/or formed between molecules or atoms. This means that one substance with a certain set of properties (such as melting point, color, taste, etc) is turned into a different substance with different properties.

Answer: Protects your eyes from chemical splashes, Must be worn during all labs, from start to lab checkout, in which chemicals, glass or heating of substances is involved. No exceptions!!

Line spectrum of hydrogen atom in Lyman series is formed​ 'absorbs energy and gets excited'

The electron in a hydrogen atom absorbs energy and gets excited and the electron jumps from a lower energy level to a higher energy level and when it comes back to its original state, it gives out energy which forms a hydrogen spectrum and the line in Lyman series is formed​ by electronic transition and all the wavelengths in the Lyman series are in the ultraviolet band and this are seen in ultraviolet emission lines of the hydrogen atom as an electron goes from n ≥ 2 to n = 1 where n is the principal quantum number and the lowest energy level of the electron.

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Answer: 94,608,000 seconds

Explanation:

365 days/1 yr=365

24 hours/1 day=24

60 min/1 hour=60

60 sec/1 min=60

365*24*60*60=

8760*3600=31536000 seconds in 1 year.

31536000*3=94608000 seconds

It cost $35.57 to drive the school bus for 94.00 miles.

Given:

Distance to drive (D) = 94.00 miles

Miles per gallon (MPG) = 6.500 miles/gallon

Cost of gas (C) = $2.459/gallon

Step 1: Calculate the amount of gas required for the trip.

Gas consumed = Distance / Miles per gallon

                          = 94.00 miles / 6.500 miles/gallon

                          = 14.4615 gallons

Step 2: Calculate the cost of gas for the trip.

Cost of gas = Gas consumed * Cost per gallon

                    = 14.4615 gallons * $2.459/gallon

                    = $35.57

Therefore, it will cost $35.57.

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There will be 0.39 moles

Take a look at the He gas in the tank:

P = 2.80 atm, or pressure

Volume = 5.00 liters.

T = (273 + 155) is the temperature. K = 428 K

R = 0.08206 L atm/L of gas (mol K)

Charle's law, Boyle's law, and Gay-Lussac law are the three gas laws that make up the combined gas law, commonly referred to as a general gas equation. For a certain amount of gas, the law illustrates the relationship between temperature, volume, and pressure.

Gas law PV = nRT

So, n = PV/. (RT)

He gasses number = 2.80 x 5.00 / (0.08206 x 428) mol equals 0.39 mol.

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Explanation:

The first involves keeping the surface of the concrete moist by the use ponding, spraying/sprinkling, damp sand or damp hessian.

The second prevents the loss of moisture from the concrete by covering it with polythene sheeting or leaving the formwork in place.

The third involves the use of spray or roller applied curing compounds.

The calculated medication dose is 3.010³g/kg

Patients receive medications either as a dosage or as a single dose. These two terms have various connotations. A dosage is a set amount of medication administered all at once. It is a singular value for mass or volume. It can alternatively be described as the mass or volume of the medicine divided by the patient's body weight. A drug's dosage is the precise quantity, number, and frequency of doses given over a precise period of time.

The dose (one time) of medication for an adult patient is the subject of this question. The patient mass is given in pounds, and the drug mass is supplied in milligrams; m drug = 200 mg

145 lbs., patient

In order to respond to this query, we convert the patient's mass to kilograms and the drug mass to micrograms:

Drug = 200 mg, 10³ mg, and 2.00, 10⁵ g

145 lb patient = kg/2.20 lb = 65.9 kg

The medication dose is:

mdrug Mpatient = 2.0010⁵g/65.9kg

= 3.010³g/kg

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Answer:

Explanation:density=mass×volume

so your answer will be 14.7×6.6=97.02

The answer would be RCH2COCH2R is more polar than RCH2(OH)R

The formic acid ( RCH2COCH2R ) is more polar than Pyridinium Chlorochromate (PCC) (RCH2(OH)R) because formic acid is from aldehyde group and is a reagent from a carbonyl group and PCC is react to form carbonyl group it's also an reagent which reacts in oxidation of alcohols.

The polarity is more which is a carbonyl compound as their electrons are loosely prepared. And also the polarity of formic acid is 6.0.

Hence, the formic acid (RCH2COCH2R) is more polar than Pyridinium Chlorochromate (RCH2(OH)R) (PCC).

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Answer:

b

Explanation:

ason solved this problem by changing 6/4 to 1.2. He then added 1.2 to 0.68 and got 1.88.

This answer is incorrect. What did he do wrong?

The event described when wind blows up the windward side, sand grains may be picked up and blown toward the top is  Dune movement.

The sand mass of dunes can move either windward or leeward, depending on if the wind is making contact with the dune from below or above its apogee.

If wind hits from above, the sand particles move leeward; the leeward flux of sand is greater than the windward flux.

Thus, the event described when wind blows up the windward side, sand grains may be picked up and blown toward the top is  Dune movement.

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Answer:true

Explanation:

if you change the sequence, the answer you get may be wrong.

The volume of the gas at 100K If 1 liter of gas at 300 K is cooled to 100K is 0.33L.

The volume of a gas can be calculated using the following formula:

V1/T1 = V2/T2

Where;

According to this question, a gas is in a flexible container. If 1 liter of gas at 300K is cooled to 100K. The volume of the gas is calculated as follows:

1/300 = V2/100

100 × 1 = 300V2

100 = 300V2

V2 = 100/300

V2 = 0.33L

Therefore, the volume of the gas at 100K If 1 liter of gas at 300 K is cooled to 100K is 0.33L.

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Answer:  [D]:  " 75 g of salt in 100 mL of water. "

____

Explanation:

         By looking at the answer choices—we can tell that all 4 (four) values for the "solvent"—[in this case: "100 mL of water".].

Note:  As a general rule—and at this point in our problem—
The answer would be:
           The solution with the most 'concentration' of solute—per the same volume of solvent—would be the most 'concentrated' solution—
would be Answer choice:  [D]:  " 75 g of salt in 100 mL of water."

Note:  Answer Choice:  [D]—has the most solute (grams of salt)—compared with the 'other values' given in the 'other' answer choices.
       →   Specifically, refer to the other answer choices:

            →  " [D:  75 g]   >   [C:  50 g]   >   [B:  40 g]   >  [A:  35 g ] ".
____
            Wishing you well in your academic pursuits—and within the "Brainly" Community" !
____

Magnesium is not a good conductor. Hence, the conductivity of magnesium is not good.

Magnesium is placed in group 2 of the periodic table. It has 2 valence electrons which are in the fully filled s-subshell. When the subshell is fully filled, the electrons are not available to move to conduct. For example, group 1 has half filled subshell which allows the electrons to move.

But, how does magnesium conduct? As its subshell is fully filled and therefore no electrons are available to move.

In group 2 metals, there is a property called s-p hybridization. The s- and p- subshells overlap so that metals can now move to the unfilled states of the p-subshell.

Hence, magnesium is not a good conductor.

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1. The number of mole of 54.5 dm³ of CH₄ at STP is 2.43 moles of CH₄

2. The number of mole of 250 cm³ of CO at STP is 0.01 mole

At standard temperature and pressure (STP),

1 mole of gas = 22.4 dm³ = 22400 cm³

At standard temperature and pressure (STP),

22.4 dm³ = 1 mole of CH₄

Therefore,

54.5 dm³ = (54.5 dm³ × 1 mole) / 22.4 dm³

54.5 dm³ = 2.43 moles of CH₄

At standard temperature and pressure STP,

22400 cm³ = 1 mole of CO

Therefore,

250 cm³ = (250 cm³ × 1 mole) / 22400 cm³

250 cm³ =0.01 mole of CO

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Answer:

A substance is considered a chemically pure substance when it has a fixed chemical composition throughout, and uniform physical and chemical properties. Because isopropyl alcohol ( C3H8O ) Is a homogenous compound with constant physical and chemical properties, as well as a uniform chemical structure, isopropyl alcohol is definitely fit to be considered a pure substance.

Atoms can not be divided is the incorrect idea in Bohr’s understanding of the atom.

Bohr believed that electrons circled the nucleus in orbits. According to current atomic theory, electrons don't follow predetermined routes.

Bohr believed that electrons traveled in circular paths around the nucleus, but current theory suggests that the structure of atomic electrons is more to 3D standing waves.

Bohr improved on Rutherford's atomic model. The majority of the atom's mass is concentrated in its nucleus, which we now refer to as the center of the atom, and electrons surround the positive mass in a manner to a cloud. Bohr's use of the quantification energy to explain the model was his most important contribution. According to his theories, electrons circling the nucleus have quantized potential and kinetic energies.

The Heisenberg Uncertainty Principle is first violated by the Bohr model because it assumes that electrons have a known orbit and radius. The Bohr Model is less effective at drawing diagrams of larger atoms and gives an incorrect value for the ground state orbital angular momentum.

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4.80 grams of oxygen will be release.

When heated in a closed container in the presence of a catalyst, potassium chlorate decomposes into potassium chloride and oxygen gas via the following reaction:

2KClO3(s) → 2KCl(s)+ 3O2(g)

mass of potassium chlorate   = 12.25g

mole of KClO3 = 12.25/122.5 = 0.1 mol

2 mole KClO3 (consumed) = 3 mole O2 (produced)

1 mole KClO3 = 3/2 mole O2

0.1 mole KClO3 = 0.1*1.5 mole O2

                          = 0.15 mole O2

mass of O2 = 0.15 * 32 = 4.80 grams

4.80 grams of oxygen will be release.

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Aliphatic compounds, on the other hand, are organic substances whose carbon atoms link with one another in open chains, either straight or branched, as opposed to containing a benzene ring. Aromatic compounds are organic substances with a planar unsaturated ring of atoms that is stabilized by an interaction of the bonds forming the ring. As a result, the primary distinction between aromatic and aliphatic chemicals is that aromatic compounds lack a cyclic structure while aliphatic compounds have straight, branching, or cyclic structures. Additionally, while the majority of aliphatic molecules are odorless, all aromatic compounds have a sweet, pleasant fragrance.

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A chemical element that has an atomic number less than 58 and an atomic mass greater than 135.6m is barium (atomic no. 56 and atomic mass137.13 ) and lanthanum (atomic no. 57  and atomic mass 135.6).

Barium is an element with the symbol Ba and atomic number 56. It is an alkaline earth metal that is soft and silvery, and it is the fifth element in group 2. Barium is never found in nature as a free element due to its extreme chemical reactivity. Oil well drilling fluid uses barium sulfate as an insoluble ingredient. It is employed as an X-ray radiocontrast agent in a purer form to image the human gastrointestinal tract. Barium compounds that dissolve in water have been employed as rodenticides despite being hazardous.

Chemical element lanthanum has the atomic number 57 and the symbol La. It is a silvery-white, ductile, soft metal that slowly tarnishes when exposed to air. It serves as the eponym for the group of 15 related elements in the periodic table between lanthanum and lutetium, of which lanthanum is the first and prototype. The rare earth elements traditionally include lanthanum.

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Answer:

Electron,

Neutron,

Proton,

& the nucleus

Explanation:

Can I have brainliest? It would help me out, if not thanks anyways! Hope this helped and have a nice day!

The empirical formula of the carboxylic acid is C₃H₆O₂.

For determination of the empirical formula of the carboxylic acid.

As you know, one mole of water, contains 2 moles of hydrogen. This means that the percent composition of hydrogen in water will be

2× 1.00794 g/mol / 18.015 g/mol × 100 = 11.19% H

What this means is that every 100 g of water will contain  11.19 g of hydrogen. In your case, the 0.2349-g  sample of water will contain  

0.2349 g water⋅ 11.19 g H / 100 g water = 0.026285 g H

Similarly, one mole of carbon dioxide, CO₂, contains one mole of carbon. The percent composition of carbon in carbon dioxide will be

1 ×12.011 g/mol / 44.01 g/mol × 100 = 27.29% C

Once again, this tells you that every 100 g of carbon dioxide will contain

27.29 g of carbon. In your case, you will have

0.5706g H₂O ⋅ 27.29 g C /100g H₂O = 0.15572 g C

The mass of carbon + hydrogen originally present in the carboxylic acid sample will be

m C + H = 0.026285 g + 0.15572 g =0.18201 g

The initial mass of the sample was equal to 0.3200 g. This tells you that the sample also contains oxygen

m oxygen = 0.3200 g −0.18201 g = 0.13799 g O

So, now that you know how many grams of each element were present in the initial sample, use their molar masses to convert these to moles

For C: 0.15572g /12.011g/mol = 0.012965 moles C

For H:  0.026285 g/1.00794g/mol = 0.026078 moles H

For O:  0.13799g/15.9994g/ mol = 0.0086247 moles O

Now, to get the compound's empirical formula, you need to find the smallest whole number ratio that exists between the number of moles of each element in the compound.

To do that, divide these values by the smallest one to get

For C:  0.012965 moles / 0.0086247 moles = 1.5032 ≈ 1.5

For H: 0.026078moles /0.0086247 moles =3.0236≈ 3

For O:  0.0086247moles /0.0086247 moles = 1

This means that you have

C₁.₅H₃O₁

Since you're looking for the smallest whole number ratio that exists between the elements, multiply each subscript by 2 to get

C₁.₅H₃O₁ * 2 = C₃H₆O₂

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Answer:

0.1295 m^2

Explanation:

just divide 1295 by 10000

The specific heat capacity of a substance, also known as the massic heat capacity or massic heat capacity in thermodynamics, is the heat capacity of a sample of the substance divided by the mass of the sample. So, the energy gain by sample will be 506J

We know that, the heat energy gained will be calculated by the formula,

Q=mcΔT

where,

Q= Heat energy gained

m=mass

c= specific heat capacity

ΔT= Change in temperature

So, Given,

m= 5.00g ,

ΔT= 419K -306K= 113K

c= 0,897J/gK

Q=mcΔT

Q= 5.0×0.897×113

Q= 506J

So, the energy gained by sample of Aluminum will be 506 J when it is warmed from 306 K to 319K , in which temperature difference is 113K

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  3.5 × 10^6 g

according to ideal gas equation, PV = nRT

where, p is pressure v is volume, n is mole of gas, r is gas onstant and t is temperature.

Pressure (p) = 741 Torr = 1 bar

Volume (V) = 5.40 ml= 0.0054litre

Amount of substance (n)  mol = ?

Temperature (T)  44°C= 371kelvin

so by putting all values in equation. PV = nRT

         = 1 ×  0.0054 =n ×8.31 ×371

         n ≈ 0.000002 = 2.0 × 10^-6

now, n is mole of gase,

mole = given mass ÷ molecular mass

given mass = 7.10g

molecular mass = given mass ÷ mole

                         7.10 ÷ 2.0 × 10^-6

                  = 3.5 × 10^6 g

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