Calcular la normalidad de 1 Kg de sulfuro de aluminio en 5000 ml de solucion.

0.342 x [tex]10^(^1^6^)[/tex])  photons are required to emit 1 joule of energy.

A photon is a particle of light defined as a discrete bundle (or quantum) of electromagnetic (or light) energy.

We need to find the number of photons emitted per second.

So we have E = hc ÷ λ

= (6.6 x [tex]10^-(^3^4^)[/tex]x 3 x [tex]10^8[/tex] m/s) ÷ 6.78 x [tex]10^(^-^7^)[/tex]nm

= 2.92 x [tex]10^(^-^1^9^)[/tex]Joules

Now number of photons per second = I / E (I = intensity)

= 1 x [tex]10^(^-^3^)[/tex] joule / sec ÷ 2.92 x [tex]10^(^-^1^9^)[/tex]joule

= 0.342 x[tex]10^(^1^6^)[/tex]

Hence, 0.342 x [tex]10^(^1^6^)[/tex])  photons are required to emit 1 joule of energy.

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The weight of CoCl₂ used to make 0.5 ltr 1 Molar solution is 49.5g.

The weight of a substance can be calculated by multiplying the number of moles of the substance by its molar mass.

However,

the number of moles of CoCl₂ must be calculated using the following formula:

no of moles = 0.5L × 1M

no of moles = 0.5moles

Molar mass of CoCl₂ = 99g/mol

mass of CoCl₂  = 0.5 × 99

mass of CoCl₂  = 49.5g

Hence, the weight of CoCl₂ used to make 0.5 ltr 1 Molar solution is 49.5g.

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The production of ammonia will be favored at high pressure and low temperature.

The term exothermic reaction has to do with a reaction in which the forward reaction is favored at lower temperatures.

Now looking at the reaction coordinate and the equation of the reaction, we know that the production of ammonia will be favored at high pressure and low temperature.

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The frequency of the green light emitted by a hydrogen atom with a wavelength of 525 nm is [tex]5.71[/tex]×[tex]10^{14} s^{-1}[/tex]

What is wavelength?

What is a frequency?

Wavelength=525nm

The relation between wavelength and frequency

[tex]v=\frac{c}{lambda}[/tex]

[tex]v=[/tex]frequency

[tex]c=[/tex]speed of light = [tex]3.0[/tex]×[tex]10^{8}[/tex][tex]m/sec[/tex]

λ(lambda)=wavelength

substitute the value in the equation mentioned above

[tex]v=3.0[/tex]×[tex]10^{8}[/tex][tex]/525[/tex]×[tex]10^{-9}[/tex]

[tex]=5.71[/tex]×[tex]10^{14}[/tex][tex]s^{-1}[/tex]

hence, the frequency of the green light emitted by a hydrogen atom with a wavelength of 525 nm is [tex]5.71[/tex]×[tex]10^{14} s^{-1}[/tex]

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Answer:

44.01 g/mol

Explanation:

Carbon dioxide is produced when carbon and oxygen are burned.

To totally burn carbon into carbon dioxide, or CO2, we require one mole of oxygen for every gram of carbon by weight.

or alternatively:

You produce 12+216=44 g of carbon dioxide for every 12 g of carbon.

The weight of CO2 in kg may be calculated if the amount of CO2 in litres is known by converting it to moles and multiplying it by 44.

1.05 moles of oxygen gas are consumed in the reaction when 2.10 mol of magnesium burns.

A mole is defined as [tex]6.02214076 × 10^{23}[/tex] of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

We are given:

Moles of magnesium = 2.10 mol

For the given chemical reaction:

2Mg + O₂ → 2MgO.

By Stoichiometry of the reaction:

2 moles of magnesium react with 1 mole of oxygen gas.

So, 2.10 moles of magnesium will react with = [tex]\frac{1}{2}[/tex] X2.10 =1.05 moles

Hence, 1.05 moles of oxygen gas are consumed in the reaction.

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C12H24O2 +17 O2-------->12CO2 + 12H2O

combustion is a chemical reaction that often involves the presence of oxygen and produces heat and light in the form of flames.

Lauric acid has a 12-carbon backbone and is a saturated medium-chain fatty acid. In addition to being a key component of coconut oil and palm kernel oil, lauric acid occurs naturally in a variety of plant and animal fats and oils.

White solid lauric acid has a little bay oil odour to it.

Lauric acid is a cheap, non-toxic, and easy-to-handle substance that is frequently employed in lab studies on melting-point depression. Because lauric acid is a solid at ambient temperature but a liquid at boiling temperatures, it can be used to test different solutes to determine their molecular weights.

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b

Explanation:

containing of ion electron and protons

Answer:

The fifth answer choice (NH3 + H2O = NH4+ + OH-)

Explanation:

An acid-base reaction occurs when an acid and base combine, and the acid, (which is H2O in this case) "donates" a proton, or an H+ to the base. In this reaction, H2O gave one of its H+ to NH3, to make NH4+ and OH-. NH4+ now has a positive charge because it gained a positive ion, while OH- now has a negative charge because it gained a negative ion.

Answer:

6 moles

Explanation:

From the equation you can see that twice as many HCL moles are used as H2 produced

2 x 3 = 6 moles  of HCL required

Activation energy is required so reactants can move together, overcome forces of repulsion, and start breaking bonds.

The minimum amount of energy that is needed to activate atoms or molecules to a condition in which they can undergo a chemical transformation or physical transport.

The activation energy of this chemical reaction is high that it will not start at room temperature. This is why a source of heat is required to start the fire: the “energy barrier” must be overcome before the reaction can proceed further.

In any chemical reaction, existing chemical bonds should be broken before new bonds formation. The breaking of chemical bonds requires an input of energy. In some reactions, the thermal energy at room temperature is enough to break the bonds.

In other cases, the thermal energy at room temperature does NOT give enough energy to break the needed bonds (by facilitating sufficiently energetic molecular collisions) to get the reaction started.

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The northern slope will have the least precipitation if winds blow against a mountain from the south.

This is referred to as the degree of steepness on a surface such as rocky areas etc.

When wind blows on the southern part of a mountains, it gets stuck which is why the northern slope have the least precipitation.

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Your question's data is not correct, it should be 100 grams of limestone instead of 10 grams, You will find the correct solution below according to that.

The percentage purity of calcium carbonate is 82.5%

The balanced chemical equation is

CaCO₃ + 2HCl  →  CaCl₂ + H₂O + CO₂

Because CO₂ is a gas, you can easily convert it to mole directly

No. of mol of CO₂ = volume dm³ /22.4 dm³

No. of mol of CO₂ = 8.5 dm³ / 22.4 dm³

No. of mol of CO₂ = 0.825 mol

According to equation 1 mole of CO2 is made from 1 mole of CaCO3

So, 0.825 mole of CO2 will be made from 0.825 mole of CaCO3

Mass of CaCO3 = moles of CaCO3 × Molar mass of CaCO3

Mass of CaCO3 = 0.825 × 100 grams

Mass of CaCO3 = 82.5 grams

Percentage purity of CaCO3 = (mass of CaCO3/Total mass of CaCO3) × 100

Percentage purity of CaCO3 = (82.5/100) × 100 %

Percentage purity of CaCO3 = 82.5 %

Thus we can say that as percentage purity is the percentage of mass of pure compound on per unit of total compound, the percentage purity of the calcium carbonate will be 82.5 %

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Taking into account definition of percent yield, the percent yield for the reaction is 91.17%.

In first place, the balanced reaction is:

Fe₂O₃ + 3 CO → 2 Fe + 3 CO₂

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: if by reaction stoichiometry 159.7 grams of Fe₂O₃ form 111.7 grams of Fe, 50.5 grams of Fe₂O₃ form how much mass of Fe?

[tex]mass of Fe=\frac{50.5 grams of Fe_{2} O_{3} x111.7 grams of Fe}{159.7 grams of Fe_{2} O_{3}}[/tex]

mass of Fe= 35.32 grams

Then, 35.32 grams of Fe can be produced from 50.5 g iron(III) oxide.

The percent yield is the ratio of the actual return to the theoretical return expressed as a percentage.

The percent yield is calculated as the experimental yield divided by the theoretical yield multiplied by 100%:

[tex]percent yield=\frac{actual yield}{theorical yield}x100[/tex]

where the theoretical yield is the amount of product acquired through the complete conversion of all reagents in the final product, that is, it is the maximum amount of product that could be formed from the given amounts of reagents.

In this case, you know:

Replacing in the definition of percent yields:

[tex]percent yield=\frac{32.2grams}{35.32grams}x100[/tex]

Solving:

percent yield= 91.17%

Finally, the percent yield for the reaction is 91.17%.

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The hazard symbol that pesticides have are skull and cross bones.

Hazard symbols represent those symbols that are used as a warning sign towards materials that are dangerous to health.

Example of symbols used are:

Therefore, the hazard symbol that pesticides have are skull and cross bones.

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The hazard symbol of pesticides is a picture of the skull and crossbones.

Pesticides are known as  substances that are meant to control or destroy pests. They include herbicide, insecticide, nematicide, avicide, rodenticide, bactericide, insect repellent, etc.

The hazard symbol of pesticides is a picture of the skull and crossbones

Thus, the hazard symbol of pesticides is a picture of the skull and crossbones.

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The balanced redox equations of the reactions are:

Balanced redox equations are those in which the atoms and electrons transferred are equal on both sides of the equation.

The balanced redox equations of the reactions are given below:

(3a) Balanced REDUCTION half reaction of the equation under basic conditions:

(3b)Balanced OXIDATION half reaction of the equation under basic conditions:

(4a) Balanced REDUCTION half reaction of the equation under acidic conditions:

(4b) Balanced OXIDATION half reaction of the equation under acidic conditions:

Therefore, the balanced oxidation and reduction half reactions are balanced by adding the numerical coefficients to the reacting species as well hydrogen ions, hydroxide ions, water molecules and electrons to the appropriate side of the reactions.

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Answer:

A device in which oil can be trapped, or which makes use of oil to trap something else I think

Answer:

The bonds between atoms in the reactants are rearranged to form new compounds in chemical reactions, but none of the atoms disappear and no new ones are formed. As a consequence, chemical equations must be balanced, meaning that the number and kinds of atoms must be the same on both sides of the reaction arrow.

Explanation:

Explanation:

because of to obey the law of conservation mass

you know the law of conservation mass states that matter is neither created nor destroyed during chemical reaction means the mass of reactants is equal to the mass of product

Answer:

2HBr + Ba(OH)2 ____ BaBr2 + 2H2O

The numbers placed in front of formulas to balance equations

Answer:

CO2

Explanation:

100% CORRECT ON EDGE

The mass of water produced when 1.000 × 10³ g of LiOH is combined with 8.80 × 10² g CO₂  is 3.25 × 10² g H₂O.

Mass is defined as a dimensionless number used to describe the mass of a particle or item. The kilogram is the International System's (SI) preferred unit of mass (kg). Atoms make up everyday matter. A majority of an atom's mass is contained in its nucleus.

It is a neutralization process when lithium hydroxide and carbon dioxide combine to form water and lithium carbonate.

The reaction is [tex]\rm CO_2 + 2LiOH \rightarrow Li_2CO_3 + H_2O[/tex]

Neutralization reaction is defined as an acid and base reaction that produces an ionic molecule and potentially water.

Thus, the mass of water produced when 1.000 × 10³ g of LiOH is combined with 8.80 × 10² g CO₂  is 3.25 × 10² g H₂O.

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Answer:

64

Explanation:

ieijkjkjjsjsjsjsjsjskskakskskskskkkdksksjdjdjdjdjdjdjdjdndndndmdndndmdmdndndndjdjdjdjdjdkdkekrk

Answer:

D

Explanation:

we use noble gas configuration of Kr because Kr atomic number is nearest to Sr

the atomic number of Kr and Sr

is equal to 36 and 38 based on this we write the electron configuration

1s2 ,2s2 , 2p6 , 3s2 , 3p6 , 4s2 , 3d10 , 4p6 === Kr and 5s2

Answer: D.

Explanation:

[Kr]5s2

3.8mL of 0.42 phosphoric acid is required.

Reaction

2H3PO4 + 3CaCL3 → Ca3(PO)4 + 6HCl

moles CaCl2 =0.16 mol/L x0.010 L = 0.0016 mol

moles of H3Po4

= 0.0016mol of CaCl2 x 2 mole of H3PO4/3mole of CaCl2

= 0.00106 mol

V of H3PO4 = 0.0016/0.42 = 0.0038L = 3.8mL

V of H3PO4=3.8mL

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Answer:

Sulfur dioxide (SO2)

⇒ Why is this the best option?

To determine the polarity of the molecule, there are two requirements. The first one has a variety of terminal atoms, whereas the second has a lone pair on the center atoms. The molecule is polar if one of the requirements is met; else, it is nonpolar. The oxygen atom is a terminal atom because it surrounds the sulfur atom, which is the center element in the SO2 molecule's Lewis structure. In this molecule, there are two terminal oxygen atoms. If we look at the first criterion, we can see that it is not met because it calls for the presence of two separate terminal atoms.

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Electrons in the Bohr model follow the number of elements in the rows of the periodic table.

2 in the first orbit

8 in the second and third ring

18 in the fourth etc...

The Bohr model is a simplistic means of explaining the placement of the subatomic particles of the elements of the periodic table.

The Bohr model arrangement of electrons follows the same pattern as the periodic table.

2 elements in the first row, and 2 electrons in the first orbit.

8 elements in the second row, and 8 electrons in the second orbit.

8 elements in the third row, and 8 electrons in the third orbit.

The fourth and fifth orbits would therefore hold 18 electrons.

For most chemists, the Bohr model does not work well beyond the third row of the periodic table because the model becomes quite oversized and bulky.

Answer:

187.416 M/s

Explanation:

First the units    M^-2 s^-1   *  M^3   =  M/s

now the numbers

3700 * .37^3 = 187.416

Answer:

7.22 x 10¹⁰ ng Ni

Explanation:

To find the mass of nickel, you need to (1) convert moles to grams (via atomic mass from the periodic table) and then (2) convert grams to nanograms. These ratios need to be multiplied by each other, starting with the given value. It is important to arrange the conversions/ratios in a way that allows for the cancellation of units (the desired unit should be in the numerator). The final answer should have 3 sig figs to reflect the given value (1.23).

Atomic Mass (Ni): 58.693 g/mol

1 gram = 1 x 10⁹ nanograms

1.23 moles Ni             58.693 g               1 x 10⁹ ng
----------------------  x  ----------------------  x  ---------------------  =  7.22 x 10¹⁰ ng Ni
                                     1 mole                       1 g