where do most of the elements on the periodic table come from?​

The required volume of 0.10M NaOH solution that student will add is 20 mL.

Volume of any solution which is required to prepare buffer will be calculated by using the below equation as:

M₁V₁ = M₂V₂, where

On putting values, we get

V₁ = (0.1)(20) / (0.1) = 20mL

Hence required volume of NaOH solution is 20mL.

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The chemical equation for the reaction between HCl and NaOH  is HCl+NaOH → NaCl+H₂O.

Neutralization reactions are those in which an acid and base reacts for the formation of water molecule and salt.

Chemical reaction between the hydrochloric acid and sodium hydroxide base is shown by the below equation

HCl + NaOH → NaCl + H₂O

Where sodium chloride is a salt.

Hence the chemical equation is HCl + NaOH → NaCl + H₂O.

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[tex]\text{No. of moles } = \dfrac{\text{Mass of substance(C)} }{\text{Molar mass of substance(C)}}\\\\\\~~~~~~~~~~~~~~~~~~~=\dfrac{3.48}{12}~ \text{mol}\\\\\\~~~~~~~~~~~~~~~~~~~=0.29~ \text{mol}[/tex]

Answers:

1) Photons are absorbed by hot gas atoms.

2) Energy is transferred through large-scale movement of material.

3) Energy is released into the photosphere.

The Sun interior is divided into three regions: the inner core, the radiative zone and the convection zone.

The inner core is the central region of the Sun and all solar energy is produced in the core by nuclear fusion.

Radiative zone is around the inner core and in this area energy is transported by radiation.

The convection zone is the outer-most layer of the interior and in this area energy is transported by convection.

Answer: 0.44

Explanation:

The specific heat of iron if 985 J of energy is required to raise the temperature of 158.5 g from 10.0°C to 24.0°C is 0.44J/g°C.

The specific heat capacity of a substance can be calculated using the following formula:

Q = m × c × ∆T

Where;

985 = 158.5 × c × (24°C - 10°C)

985 = 2219c

c = 985/2219

c = 0.44 J/g°C

Therefore, the specific heat of iron if 985 J of energy is required to raise the temperature of 158.5 g from 10.0°C to 24.0°C is 0.44J/g°C.

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Answer:

Substances that dissolve most readily in water include ionic compounds and polar covalent compounds. aqueous solution. water that contains dissolved substances. solvent. the dissolving medium in a solution.

Explanation:

The natural types of greenhouse gases are more difficult to control and eliminate while the human-made type are easier.

Greenhouse gases are specific type of gases that have the ability to trap and release heat in their bonds.

Greenhouse gases are the cause of global warming, which is the gradual increase in temperature of the Earth's atmosphere.

However, greenhouse gases can either occur naturally or be synthesized artificially. The naturally-occuring greenhouse gases like CO2 are more difficult to control because they are not produced by humans.

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The pH of a solution that is 0.50 M in HCOOH is 2.045.

pH of the solution will be calculated by taking the negative logarithm of the concentration of H⁺ ion.

Given chemical reaction will be:

                            HCOOH(aq)   ⇄   H⁺(aq)   +   HCOO⁻(aq)

Initial:                         0.50                    0                    0

Equilibrium:              0.50-x                  x                    x

Given that, pKa = 3.75

Ka = [tex]10^{-pKa}[/tex]

Ka = [tex]10^{-3.75}[/tex] = 0.000178

Ka for the above equation will be written as:
Ka = [H⁺][HCOO⁻]/[HCOOH]

Ka = (x)² / (0.50-x)

x is negligible as compared to 0.5, so the equation becomes

0.000178 = (x)² / 0.50

x² = (0.000178)(0.5) = 0.000089

x = 0.009

[H⁺] = 0.009M

pH will be calculated as:

pH = -log(0.009) = -(-2.045) = 2.045

Hence pH of the solution is 2.045.

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When silver nitrate reacts with potassium sulfate, the products would be silver sulfate and potassium nitrate.

The reaction between silver nitrate and potassium sulfate is a double replacement reaction that is represented by the following equation:

[tex]2 AgNO_3 + K_2SO_4 --- > Ag_2SO_4 + 2 KNO_3[/tex]

Thus, the products are silver sulfate ([tex]Ag_2SO_4[/tex]) and potassium nitrate ([tex]KNO_3[/tex]).

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Answer:

A

Explanation:

Explanation:

It's so because we know that stone is insoluble, ain't it, so it takes space in water & the water level rises.

But, when a spoon of sugar is added to water, it is soluble & hence mixes with water, so it doesn't rise.

I Hope this helps! (ㆁωㆁ)

Answer:

The Arrhenius model

Explanation:

The Arrhenius state that an acid is a substance that contains hydrogen and ionizes to produce hydrogen ions in aqueous solution.

Answer:

The molecular weight of sodium sulfate is 142.1 g/mol. To calculate the mass of sodium sulfate, substitute the values in the formula. Therefore, the mass of sodium sulfate formed when we start with 200.0 grams of sodium hydroxide and you have excess sulphuric acid is 355.25g.

The energy i.e. needed is 26.8 kJ of energy

The calculation is as follows:

the moles of diethyl ether is

= 1.01 moles

Since one mole of diethyl ether require heat = 26.8 kJ

Now the energy should be the same i.e. 26.8

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ΔH for the process is -252.3 cal/mol or -1056 j/mol.

A solid salt compound dissociates in liquid water to form an aqueous solution of its constituent ions.

This is a chemical reaction, with the required heat change at constant pressure termed the enthalpy of solution.

If this value is positive, then the final prepared solution will have a lower temperature than the starting pure solvent.

Conversely, a negative enthalpy value results in a solution temperature that is higher than the starting solvent temperature.

It is given that

NaOH (s) → Na (aq) + OH (aq)

mass of NaOH is 16.9 g

mass of water = 70 g

ΔT = 86.6-22.4 °C = 64.2 °C

q = m × Cg × ΔT

q = amount of energy released or absorbed

m = mass

Cg = specific heat capacity

ΔT = change in temperature

n = m ÷ M

n = moles of solute

m = mass of solute

M = molar mass of solute

ΔHsoln = q ÷ n

ΔHsoln = molar enthalpy (heat) of solution

q = amount of energy (heat) released or absorbed

n = moles of solute

Cg= 1 cal/gm/°C

Now substituting the values in the equation

q = m × Cg × ΔT

q = 16.9 * 1 * 64.2

q = 1085 cal

n = m ÷ M

M= 70/18=3.9

n=16.9/3.9

n=4.3

ΔH = q ÷ n

ΔH =1085 /4.3

ΔH= -252.3 cal/mol or -1056 j/mol

Therefore ΔH for the process

NaOH(s) → Na(aq) + OH(aq)

is -252.3 cal/mol or -1056 j/mol

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The individual numbers which are present in chemical formula is subscript.

Chemical formula of any compound of chemistry consist more than one atoms in it and gives idea about the number of atoms present in that compound.

Given chemical formula of glucose is C₆H₁₂O₆.

In the given chemical formula of glucose, number which shows the amount of carbon, hydrogen and oxygen are known as subscripts.

Hence, individual number are subscript.

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Answer:

4 moles of H2

Explanation:

From the equation, twice as many

2 moles of O2   requires 4 moles of H2

1mol of Oxygen requires 2 moles of Hydrogen

Moles of Hydrogen

The concentration of the copper half cell with 0.22 V is [tex]\rm \bold{5.7\;\times\;10^{-11}\;M}[/tex].

In the electrochemical cell, the reduction and oxidation takes place in different electrodes, and thereby it is termed as half cell. The standard cell potential of the given cell is 0 V.

The reduction potential of one half cell cathode is considered to be given as 1.6 mM. The cell potential is 0.22 V.

The potential of the half cell is given as:

[tex]\rm E=E^\circ_{cell}-\dfrac{0.059}{n}\;log\dfrac{anode}{cathode}\\\\0.22\;V=0-\dfrac{0.059}{2}\;log\dfrac{anode}{1.6\;\times\;10^-^3\;M}\\\\Anode\;conc.=5.7\;\times\;10^{-11}\;M[/tex]

The concentration of the copper half cell with 0.22 V is [tex]\rm \bold{5.7\;\times\;10^{-11}\;M}[/tex].

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Answer:

Im pretty sure its B) 43

Explanation:

The best choice that explains why atoms of carbon-14 (c-14) are unstable is there are 2 more protons than neutrons in the nucleus

An atom is said to be stable if the number of neutrons in the nucleus is greater than number of protons in the nucleus, because the the neutrons increases the nuclear force which keeps the atom stable.

Thus, the best choice that explains why atoms of carbon-14 (c-14) are unstable is there are 2 more protons than neutrons in the nucleus.

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Answer:

D. there are 2 more neutrons than protons in the nucleus.

Explanation:

Answer: Hello! I'm Jungkook. Here is your answer.....

1 Atom.

Explanation:

Hope this helps! Anneyong/Bye!

xoxoKookie

Answer: 6.559055381954511

Explanation:

Answer:

don't know what u mean by that

Explanation:

so help me

Answer:

There would be 25 moles

Explanation:

This is the equation for water (synthesis):

2H₂   +   O₂   →    2H₂O

Since there are 25 moles of water, the moles of hydrogen gas will have 25 moles.

The number of atoms of oxygen are present in 2.50 moles of sulfur dioxide is 30.110 × 10²³.

Avogadro's number is define as the number of atoms present in one mole of any substance and it is equal to 6.022 × 10²³.

In the 1 mole of SO₂ 2 moles of oxygen are present. So that in 2 moles of SO₂, 2(2.5) = 5 moles of oxygen is present.

No. of atoms of oxygen in 5 moles of oxygen will be calculated as:

No. of atoms = 5 mole × 6.022 × 10²³atoms per mole = 30.110 × 10²³atoms

Hence number of atoms of oxygen is 30.110 × 10²³.

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The pressure (in atm) in a 5 L tank with 37.50 grams of oxygen gas at 350 K is 6.715 atm.

Pressure of gas will be calculated by using the ideal gas equation as:
PV = nRT, where

P = pressure = ?

V = volume = 5 L

R = universal gas constant = 0.082 L.atm / K.mol

T = temperature = 350 K

n is the moles of gas and it will be calculated as:
n = W/M, where

W = given mass = 37.50 g

M = molar mass of oxygen = 32g/mol

n = 37.50/32 = 1.17 mol

On putting all these values, we get

P = (1.17)(0.082)(350) / (5) = 6.715 atm

Hence resultant pressure of the oxygen gas is 6.715 atm.

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Answer:

carbon nuclei...........

Half-life is a time in which the concentration of the substance gets reduced to 50% of the initial concentration. The number of tritium that will be left after 51 years is 0.624 kg.

Isotopes are chemical substances that have the same atomic number but different atomic mass because they have a different number of neutrons in the nuclei.

The half-life of the isotope, tritium is 12.3 years. Assuming we have 11 kg of substance and a number of years 51 years.

[tex]11 \times 2 ^{\frac{-51}{12.3}} = 0.6239 \;\rm kg[/tex]

Therefore, the number of tritium that will be left after 51 years is 0.624 kg.

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The compound that a carbon-carbon double bond is Butene.

Alkene is a hydrocarbon containing at least a carbon–carbon double bond. Alkene is often used as synonym of olefin, that is, any hydrocarbon containing one or more double bonds.

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