explain the role of sulphuric acid in limit test for iron​

Answer:K2X

Explanation: Valency can be defined as the combining power of an element. It is the valency that dictates the value an element will have when writing a chemical formula for its compound.

MgX is a compound of magnesium and an element X. The valency of magnesium in most of its compound is +2. Now for the 2 to have been absent in the chemical formula, this shows that the element X itself have a valency if -2 for the valencies of both to have canceled out.

Now considering the element potassium, it is an alkaline metal belonging to group 1 of the periodic table. Hence, it is expected that it has a valency of +1

Forming a compound with element X means there would be an exchange of valencies between the two. We have established that x has a valency of -2. The formula of the compound thus formed by exchanging the valencies of both element would be K2X

The chemical formula for the compound formed between Lithium and element X is Li₂X.

Valency can be described as the combining power of a chemical element. It is the valency that describes the value an element will have in the chemical formula for that compound.

MgX compound is a compound of magnesium and an element X. The valency of magnesium is +2.  The chemical formula shows that the element X itself has a valency of -2 which gave a neutral compound.

Now given element is Lithium, it is an alkali metal of group 1 of the periodic table. It has a valency of +1 as it has one electron in its valence shell.

Forming a compound with element X, there will be an exchange of valencies between the two. As element X has a valency of -2. The formula of the formed compound by exchanging the valencies of Lithium and element X would be Li₂X

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Answer:

CO2 AND H20 I THINK IM 99 PERCENT SURE

Answer:

2.258x 10 above 24 molecules

Explanation:

We use Avogadro's number of 6.022×1023 molecules per mole to calculate the number of molecules from the number of moles represented by 165 g of carbon dioxide.

The gram-molecular weight of carbon dioxide can be calculated from the atomic weights for carbon and oxygen (two of them in CO2) given in a Periodic Table of the Elements.

165 g CO244.01 g/mol×6.022×1023moleculesmol

=2.258×1024molecules

Answer:

sodium

Explanation:

sodium is an element with the atomic no. of 11 and atomic mass of approximately 23

Answer:

huwattt

Explanation:

i can't understand

Answer:

More Reactive:

iron

hydrogen

zinc

magnesium

zinc

iron

Explanation:

The reactivity of metals can be determined based on their ability to displace other metals from their compounds or to displace hydrogen from acids. Generally, metals that are higher in the reactivity series can displace metals lower in the series.

1. **Iron & Copper:** Iron is more reactive than copper. If iron is present in its pure form, it would displace copper from its compound.

2. **Copper & Hydrogen:** Hydrogen is less reactive than copper. No reaction will occur if hydrogen is the element in pure form.

3. **Zinc & Iron:** Zinc is more reactive than iron. If zinc is present in its pure form, it would displace iron from its compound.

4. **Iron & Magnesium:** Magnesium is more reactive than iron. If magnesium is present in its pure form, it would displace iron from its compound.

5. **Zinc & Hydrogen:** Hydrogen is less reactive than zinc. No reaction will occur if hydrogen is the element in pure form.

6. **Iron & Hydrogen:** Hydrogen is less reactive than iron. No reaction will occur if hydrogen is the element in pure form.

Remember, the reactivity series is a ranking of metals based on their tendency to lose electrons and form positive ions. Elements higher in the series can displace elements lower in the series from their compounds in certain reactions.

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A 1.85 M acetone solution (MM = 58.08 g/mol) with a density of 0.971 g/mL has a mass percent of acetone of 11.0%.

It refers to the mass of solute in 100 grams of solution.

Let's suppose we have 1 L of the solution.

We have a 1.85 M solution of acetone (MM = 58.08 g/mol). We will calculate the mass of acetone using the following expression for molarity.

M = mass acetone / MM acetone × liters solution

mass acetone = M × MM acetone × liters solution

mass acetone = 1.85 mol/L × 58.08 g/mol × 1 L = 107 g

We have 1 L (1000 mL) of the solution with a density of 0.971 g/mL.

1000 mL × 0.971 g/mL = 971 g

%acetone = (107 g/971 g) × 100% = 11.0 %

A 1.85 M acetone solution (MM = 58.08 g/mol) with a density of 0.971 g/mL has a mass percent of acetone of 11.0%.

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Answer

0.16574

Explanation:

because why not

Answer:

Planck made many contributions to theoretical physics, but his fame rests primarily on his role as originator of the quantum theory. This theory revolutionized our understanding of atomic and subatomic processes, just as Albert Einstein's theory of relativity revolutionized our understanding of space and time

Answer:

revolutionized our understanding of atomic and subatomic processed

Answer:

False

Explanation:

Nutrients are so important to our health.Nutrients are compounds in foods essential to life and health, providing us with energy, the building blocks for repair and growth and substances necessary to regulate chemical processes.

Answer:

Okay ask away. . . You haven't asked anything that we would be able to answer

Answer:

Average kinetic energy of gases, which is derived from the RMS (root mean square speed) and KE equation, can be solved as:

It appears that the average KE of gases is dependent on the temperature which means that all gases will have the same KE as long the temperature is the same

Answer:

If you could miraculously remove two neutrons from an atom's nucleus, the atomic number and electrical charge would stay unaltered. Because neutrons have no electrical charge, adding or removing them from the nucleus has no effect on the nucleus's electrical charge. It does, however, alter the nucleus's mass. Isotopes are formed by adding or subtracting neutrons from the nucleus.

Answer:

Ag/Ag+ electrode is cathode and Cu/Cu+ electrode is anode.  

~im not sure it its correct i found it~

Explanation:

Answer:

180 degrees

Explanation:

sp hybridization generates orbitals that overlap linearly, generating a straight line. This leads to an angle measurement of 180 degrees.

Answer:

the ground of the building or supports

Explanation:

because that's what holds the building in place

Answer:

Fe2(SO4)3(H2O)n

Explanation:

Answer:

sorry I couldn't understand the question

300 g of LiClO₄ produce 5.64 moles of O₂, which is equivalent to 136 L of O₂ at 101.5 kPa and 21 °C.

Let's consider the following balanced equation.

LiClO₄(s) ⇒ 2 O₂(g) + LiCl(s)

We can calculate the moles of O₂ produced from 300 g of LiClO₄ using the following relationships.

[tex]300 g LiClO_4 \times \frac{1molLiClO_4}{106.39gLiClO_4} \times \frac{2molO_2}{1molLiClO_4} = 5.64molO_2[/tex]

Then, we will convert 101.5 kPa to atm using the conversion factor 1 atm = 101.325 kPa.

[tex]101.5 kPa \times \frac{1 atm}{101.325kPa} = 1.002atm[/tex]

Next, we will convert 21 °C to Kelvin using the following expression.

[tex]K = \° C + 273.15 = 21\° C + 273.15 = 294 K[/tex]

Finally, we will calculate the volume occupied by 5.64 moles of oxygen using the ideal gas equation.

[tex]P \times V = n \times R \times T\\\\V = \frac{n \times R \times T}{P} = \frac{5.64 mol \times (\frac{0.082atm.L}{mol.K} ) \times 294K}{1.002atm} = 136 L[/tex]

300 g of LiClO₄ produce 5.64 moles of O₂, which is equivalent to 136 L of O₂ at 101.5 kPa and 21 °C.

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Answer:

C) Bromine

Explanation:  Bromine needs just one electron to fill its outer shell.

Bromine has the greatest attraction for electrons in a covalent bond because it has the highest electronegativity among the given option as it needs only one electron to complete its octet. Therefore, option (C) is correct.

Halogens are the elements of group 7 of the modern periodic table, which contains five elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).

Halogens are generally nonmetals in which fluorine and chlorine are gases at room temperature and bromine is a liquid, iodine and astatine are solids. Halogens are very reactive as they have seven valence electrons and need only one electron to get a noble gas configuration.

As we move left to right in a period the electronegativity increases and all the given elements Se, As, Br and Kr are elements of the same period but the Kr is a noble gas. Therefore, Bromine has the greatest attraction for electrons in a covalent bond.

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Answer:

So oxidation reactions need not involve oxygen. This redox reaction is actually the sum of two separate half-reactions (a reduction half-reaction and an oxidation half-reaction).

The oxidation reaction does not require oxygen as a reactant. An atom, molecule, or ion loses one or more electrons during the chemical process of oxidation, increasing its positive charge.

When electrons are lost or the oxidation state increases, it is called oxidation; when they are gained or the oxidation state decreases, it is called reduction.

A molecule is said to be oxidized when oxygen is added to it or when hydrogen is taken out of it. Reduction is the process of introducing hydrogen or removing oxygen from a molecule.

An element is oxidized if it loses electrons, which is another definition of oxidation. Any electron acceptor can oxidize an element by taking in the lost electrons, hence oxygen is not a necessary component in oxidation.

The process of converting glucose into ATP requires oxygen. For each glucose, the first step only releases two molecules of ATP.

Thus, The oxidation reaction does not require oxygen as a reactant.

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Answer:

5.9405*10^14 Hz

Explanation:

Remember the equation c=v*λ

v=frequency

λ=wavelength

By manipulating the equation, we can get it in terms of frequency:

c/λ=v

Now convert wavelength to meters (1nm=m*10^-9)

5.05*10^-7m (2 decimal places were shifted to make the number between 1-10, hence the -7 exponent)

Use the manipulated equation:

(3.00*10^8)/(5.05*10^-7), which yields:

5.9405*10^14 Hz (or s^-1)

The frequency of the photon will be "[tex]5.9405\times 10^{14} \ Hz[/tex]".

According to the question,

Wavelength,

or,

          [tex]= 5.05\times 10^{-7} \ m[/tex]

As we know the equation,

→ [tex]c = v\times \lambda[/tex]

or,

→ [tex]v = \frac{c}{\lambda}[/tex]

By putting the values, we get

     [tex]= \frac{3.00\times 10^8}{5.05\times 10^{-7}}[/tex]

     [tex]= 5.9405\times 10^{14} \ Hz[/tex]

Thus the above answer is right.

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Answer:

b. R decreases, V is constant, I increases

Explanation:

when we increase the diameter of wire increases ,resistance decreases and current increases.Therefore, the option is b.  

Resistance is an electrical quantity which opposes the electric current in the circuit. Resistance is directly proportional to the length of the wire and inversely proportional to the diameter of the wire. If length of wire increases resistance will increases and if the diameter of the wire increase resistance will decreases.

                                R = ρ L/A

Here ρ is the resistivity

        L is the length of the wire

        A  is the cross-sectional area of wire/diameter of the wire

Voltage is the potential difference between two terminals of voltage source. Current is the flow of electrons in the circuit. Voltage is the product of current and resistance.

                              V=IR

Rewrite the above equation interms of current

                              I=V/R

From the above equation we can say that current is inversly proportional to the resistance.Therefore,the correct option is b.

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Answer:

C3H8(g) + 5O2(g) = 3CO2(g) + 4H2O(g)

Explanation:

Answer:

yiur mom

Explanation:

d

The number of atoms in 1.28 grams of vanadium is 1.51×10²² atoms

From Avogadro's hypothesis,

1 mole of Vanadium = 6.02×10²³ atoms

But

1 mole of Vanadium = 51 g

Thus,

51 g of Vanadium = 6.02×10²³ atoms

51 g of Vanadium = 6.02×10²³ atoms

Therefore,

1.28 g of Vanadium = (1.28 × 6.02×10²³) / 51

1.28 g of Vanadium = 1.51×10²² atoms

Thus, 1.51×10²² atoms is present in 1.28 g of Vanadium

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Answer:

C.

Explanation:

I search it on Gøogle

Answer:

The nucleus is positively charged because it contains all of the protons however the charge of an atom is neutral because there is an equal amount of protons (positive) and electrons (negative) meaning the opposite charges cancel each other out therefore making the atoms overall charge neutral.

Explanation:

Answer:

location 3...........

Answer:

djxgfchkgvjhbkjlnk:Hg/ufy

Explanation:

fzdxgfchg,jv.hkbjnj.jhcgbc