Why is KMnO4 regarded as a secondary standard solution ?

Answer

Explanation

Given:

% composition: 19% tin and 81% iodine​

What to find:

The empirical formula for the compound

Step-by-step solution:

Assume we have 100 grams total of the substance.

Grams Sn: 19 g

Grams I: 81 g

Now, let's convert the number of grams of each element into moles below:

Moles Sn: 19 g/118.71 g/mol = 0.16 mol

Moles I: 81 g/126.90 g/mol = 0.64 mol

Finally, let's divide the number of moles of each element by the smallest number obtained:

Sn = 0.16/0.16 = 1

I = 0.64/0.16 = 4

The author describes about two types of energy, in this passage which is motion energy and heat energy.

The energy that results from the movement of atoms and molecules within a substance is known as thermal energy, also known as heat energy. These particles generate more heat as they move more quickly. The thermal energy of the earth is referred to as geothermal energy.

Motion energy is energy that is held in the motion of objects. More energy is stored as they move faster. Energy is required to start an object moving, and energy is released when an object slows down. Motion energy includes things like the wind. A car crash is a dramatic example of motion energy; the vehicle comes to a complete stop and abruptly and uncontrollably releases all of its motion energy.

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Answer:

all living things need water. no water, no life.

The given concentration, 0.40% (m/v), is a mass volume percent concentration. It indicates us that there are 0.40g of NaCl in every 100mL of solution.

We can use this information to detemine how many grams of NaCl are there in 3.0L (3000mL) of solution:

Now, convert this amount of mass to moles using NaCl molar mass:

It means that the corect answer is 0.20 moles of NaCl.

The missing component in the nuclear equation [tex]\frac{209}{84} Po\\[/tex] → [tex]\frac{205}{82}Pb[/tex] + X is predicted to be [tex]\frac{4}{2} He[/tex].

This nuclear reaction is form of an alpha decay process. In this alpha decay process, the nucleus gets decayed through the release of an alpha particle. The mass number of the nucleus is decreased by 4 units and atomic number of the nucleus is also reduced by 2 units. The particle which is released is nucleus of helium.

The general equation which represents the alpha decay process is -

[tex]\frac{A}{Z} X[/tex] → [tex]\frac{A-4}{Z-2} Y[/tex] + [tex]\frac{4}{2} \alpha[/tex]

The nuclear equation is -

[tex]\frac{209}{84}Po[/tex] → [tex]\frac{205}{82} Pb[/tex] + X

We will balance the reaction and we have to remember in balancing the nuclear equation is that the sums of the superscripts and the subscripts has to be the same on both sides of the equation.  

Sum of superscripts : 210 = 206 + y,

                                   so, y =4.  

Sum of subscripts : 84 = 82 + x,

                                    so, x = 2.

Therefore, the nuclear equation is -

[tex]\frac{209}{84} Po[/tex] → [tex]\frac{205}{82} Pb[/tex] + [tex]\frac{4}{2} He[/tex]

Hence, the missing component is [tex]\frac{4}{2} He[/tex].

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The alkali metals grow more reactive as you move down the group, but the halogens become less reactive as you move down, which is one distinction between the reactivity of the groups. The most active halogen is fluorine, whereas the most active naturally occurring alkali metal is cesium.

What are halogens and alkali metals ?

The features of the halogen elements' compounds with other elements and their overall chemical behavior are remarkably similar to one another. However, there is a progressive change in characteristics from fluorine through chlorine, bromine, and iodine to astatine, with fluorine and chlorine having the most marked differences between two succeeding elements. In addition to being the most reactive halogen and element overall, fluorine has a few other characteristics that set it apart from the other halogens.

Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Cesium (Cs), and Francium are alkali metals, which are elements of group 1. (Fr). Since they only have one electron in their valence shell, they are extremely reactive and strive to adopt the stable octet configuration of the noble gases. The alkali metals exhibit metal properties such as strong thermal and electrical conductivity, lustre, ductility, and malleability. In the outermost shell of each atom of an alkali metal, there is just one electron.

The alkali metals grow more reactive as you move down the group, but the halogens become less reactive as you move down, which is one distinction between the reactivity of the groups. The most active halogen is fluorine, whereas the most active naturally occurring alkali metal is cesium.

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Answer: C. 1 liter of water vapor

Explanation:

The average kinetic energy increases as follows.

Gas > Liquid > Solid

You can think about it as how fast and freely the molecules are moving in each state, with gases being the greatest.

From the chemical structure of the compound that is clearly shown in the question, the ions that should be in the solution are;  lead II ion and the acetate ion.

The term ions has to do with the species that have a positive charge or a negative charge. Thus we could define an ion as as a charged specie. The charge could owe to an excess of electrons in which case the charge is negative or due to a deficiency of electrons which gives us a positive charge.

Looking at the compound that is in solution, we can see that the ions that are present are lead II ion and the acetate ion.

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The number of moles of Fe₂O₃ that will be required to produce 645 grams of Fe is 5.78 moles

We'll begin by obtainig the number of mole of Fe. This can be obtained as follow:

Mole = mass / molar

Mole of Fe = 645 / 55.85

Mole of Fe = 11.55 moles

Finally, we shall determine the number of moles of Fe₂O₃ needed. Details below

Fe₂O₃(s) + 2Al(s) → 2Fe(l) + Al₂O₃(s)

From the balanced equation above,

2 moles of Fe were produced from 1 mole of Fe₂O₃

Therefore,

11.55 moles of Fe will be produce from = (11.55 × 1) / 2 = 5.78 moles of Fe₂O₃

Thus, the mole of Fe₂O₃ needed is 5.78 moles

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According to the pressure law, the pressure (P) of a fixed mass of a gas is directly proportional to its absolute temperature (T) provided that the volume remains constant. Mathematically;

k is the variation constant

If we have initial and final pressure and initial and final temperature, the formula can be written as:

3) The gas law that demonstrates the equation and definition above is known as the PRESSURE LAW.

Taking into account the reaction stoichiometry, H₂SO₄ is the reactant in excess and 0.00635 moles are in excess after the acid-base neutralization reaction.

Molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

molarity= number of moles÷ volume

Molarity is expressed in units moles/ L.

In first place, the balanced reaction is:

H₂SO₄ + 2 NaOH  → Na₂SO₄ + 2 H₂O

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 limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.

You have the acid-base neutralization reaction of:

Considering the definition of molarity, you can get the amount of each compound that you have in this reaction:

To determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 1 mole of H₂SO₄ reacts with 2 moles of NaOH, 0.03175 moles of H₂SO₄ reacts with how many moles of NaOH?

moles of NaOH= (0.03175 moles of H₂SO₄× 2 moles of NaOH)÷ 1 mole of H₂SO₄

moles of NaOH= 0.0635 moles

But 0.0635 moles of NaOH are not available, 0.0508 moles are available. Since you have less mass than you need to react with 0.03175 moles of H₂SO₄, NaOH will be the limiting reagent and H₂SO₄ will be the excess reagent.

To determine the amount of excess reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 2 moles of NaOH reacts with 1 mole of H₂SO₄, 0.0508 moles of NaOH reacts with how many moles of H₂SO₄?

moles of H₂SO₄= (1 mole of H₂SO₄× 0.0508 moles of NaOH)÷ 2 moles of NaOH

moles of H₂SO₄= 0.0254 moles

If you have 0.03175 moles of H₂SO₄, the amount of moles in excess is calculated as:

moles in excess= 0.03175 moles - 0.0254 moles

moles in excess= 0.00635 moles

Finally, there are 0.00635 moles of NaOH in excess.

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The amount, in grams, of hydrofluoric acid that will be formed when 173.63 grams of hydrogen reacts with 173,63 grams of fluorine would be 182.8 grams.

The balanced equation of the reaction is written as:

[tex]H_2 + F_2 -- > 2HF[/tex]

According to the equation, the mole ratio of hydrogen and fluorine that react to produce hydrofluoric acid is 1:1.

Recall that: mole of substance = mass of the substance/molar mass

Molar mass of [tex]H_2[/tex] = 1x2 = 2 g/mol

Molar mass of [tex]F_2[/tex] = 19x2 = 38 g/mol

Mole of 173.63 grams  [tex]H_2[/tex] = 173.63/2

                                             = 86.82 moles

Mole of 173.63 grams  [tex]F_2[/tex]  = 173.63/38

                                        = 4.57 moles.

Considering the mole ratio of the two reactants, it appears that fluorine is limited in availability and will, therefore, determine the amount of hydrofluoric acid that will be produced.

Mole ratio of fluorine to hydrofluoric acid = 1:2.

Equivalent mole of hydrofluoric acid = 4.57 x 2 = 9.14 moles.

Mass of 9.14 moles HF = 9.14 x 20

                                     = 182.8 grams

Thus, the amount of hydrofluoric acid formed from the reaction is 182.8 grams.

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Answer

C. Potential energy

Explanation

A carbohydrate molecule has chemical bonds, Potential energy is available between chemical bonds.

Answer:

b. Subscripts in a formula may be changed so that the equation is balanced.

Explanation:

The statement b is not correct, because only the coefficients may be changed to balance the equation. If we change the subscript in a formula, we will change the compound.

Answer:

water and salt are compounds, water is H2O and table salt is NaCl.

tin is just a metal, an element, not a compound.

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Answer

pH = 3.32

Explanation

Given

Acid dissociation of carbonic acid (Ka) = 4.4x10^-7

Concentration = 0.530 M

Solution

The carbonic acid dissociates into:

Now we can calculate the pH

pH = -log[H+]

pH = -log[4.816x10^-4]

pH = 3.32

Answer:

The species that oxidizes is lithium, or Li

Explanation:

Since I2 is know to be a halogen, and halogens are oxidizers, iodine is probably not the species being oxidized. So, Li is being oxidized.


Another way to look at the problem is to assign oxidation numbers to all elements on the right and left

The left:
lithium = 0
iodine = 0
Both are 0 since they are in their most stable elemental states

The right:
lithium : +1
Iodine: -1

When something looses an electron and becomes more positive, it is oxidized. Lithium goes from 0 to 1, clearly displaying a rise in oxidization state. So, lithium is being oxidized.

The energy of an orange lamp with a frequency of 5.10 x 10¹⁴ Hz is 3.38 x 10⁻¹⁹ J.

Frequency is defined as the number occurrences of repeated events per unit of time. SI unit is hertz (Hz).

Using the formula,

E = hν

where,

E = energy in joules (J)

h = Planck's constant =  6.63 x 10⁻³⁴ J

ν = frequency in hertz

Given :

Frequency = 5.10 x 10¹⁴ Hz

h = 6.63 x 10⁻³⁴ J

Putting the values,

E = (6.63 x 10⁻³⁴) x (5.10 x 10¹⁴) J

E = 3.38 x 10⁻¹⁹ J

The energy of an orange lamp with a frequency of 5.10 x 10¹⁴ is  3.38 x 10⁻¹⁹J.

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The complete question is -

What is the energy of an orange lamp with a frequency of 5.10 x 10¹⁴ Hz ?

Answer:

its the 3rd one

Explanation:

The temperature increases (gets warmer)

When the molecules in a substsnce vibrate faster ans faster, it shows that there is an increase the spaces between the molecules thereby leading to an increase in the kinetic enrgy of the molecule

The presence of this extra spaces causes the molecule to move freely thereby increasing the temperature of the substance.

In summary, the higher the vibration, the higher the kinetic energy, and the higher the temperature.

Average reaction rate is 0.02 mol/liter/sec

Change in concentration divided by the change in time gives average reaction rate. The rate of a chemical reaction is measured in mol/l/s.

Average rate is defined as the change in molar concentration of either reactants or products in time is called as average rate. The concentration of reactants decreases during reaction, whereas the concentration of products keeps on increasing until an equilibrium is reached.

Evaluating an average rate shows the amount of change of one variable with respect to another. The other variable is generally time that describes the average change in distance or chemical concentrations.

For the given reaction

CO(g) + NO₂(g) → CO₂(g) + NO(g), a CO₂

concentration of 0.040

moles/liter was measured at 2 seconds.

Average reaction rate = concentration/ time

0.040/ 2

=0.02 mol/l/sec

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The Hydrogen atom's valence electron Fluorine attracts electrons better than any other element.

The more electronegative atom pulls the bond electrons harder so the shared electrons spend more than half of the time on the more electronegative atom, giving it a partial negative charge. For example, in water O is more electronegative than H and thus has a partial negative charge.

The higher the ionization energy the stronger the attraction between the nucleus and the valence electrons requiring more energy to remove the valences. electronic. The further away the electron is from the nucleus the more likely it is to be ejected. In other words, ionization energy is a function of atomic radius. The larger the radius the smaller the amount of energy required to remove an electron from the outermost orbital.

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- First, to calculate the % concentration of glucose in the solution, we need to add the 8.5g of glucose to the 35 g of water, to get the weight of the solution:

- Second, we calculate the %w/w (weight/weight) with the solute weight and the solution weight:

- So,

Step 1

The chemical formula of iron (III) sulfate is the next one:

Fe2(SO4)3

As we can see, there are 3 x 1 atom of S, 3 atoms of S

----------------

Step 2

Information needed:

The atomic masses of:

Fe) 55.8 g/mol

S) 32.0 g/mol

O) 16.0 g/mol

(Please, the periodic table is useful here)

----------------

Step 3

The % of S in Fe2(SO4)3 is calculated as follows:

Answer: 24 % of S

Answer: an organ

Explanation:

Answer

Yes, there is a limit to the distance through which diffusion can occur. This is because diffusion time increases with the square of diffusion distance. Diffusion time is inversely proportional to the diffusion coefficient. hus, if the diffusion distance is small, diffusion happens faster because the particles do not have as far to travel.

Reaction - It's understood that H+ doesn't exist on its own in water, and H₃O⁺(aq)⁺Cl⁻(aq) are both aqueous.

What is Reaction?
An act that changes one group of chemical constituents chemically into another is known as a chemical reaction. Chemical reactions typically involve changes that only influence the positions of electrons in the formation and dissolution of chemical bonds between atoms, with no change to the nuclei. Chemical processes are commonly described by a chemical equation (no change to the elements present). The study of chemical processes involving unstable and radioactive elements—where both electronic and nuclear changes may take place—is known as nuclear chemistry.

When Acid HCl react with water it dissociates as H⁺ + Cl⁻ ion. H⁺ is a proton (Hydrogen ion is a proton with the charge on it) but this single unit of the charge is very small as compared to it value of the solution is water and acid. The resulting extraordinary high change desity of the proton strongly atom or molecule in ehich there exist an excess of the
⁻ve charge. In the case of water, the lone pair (e⁻) on oxygen attract the proton and form a co-ordinate bond with it creating a hydronium ion (H₃O⁺)

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Answer:

It's understood that H+ doesn't exist on its own in water, and H30(aq) + Cl(aq) are both aqueous.

Explanation:

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To calculate the average mass of Ne (neon), we have to use this formula:

The average atomic mass of Ne = 20.18 u

The density of graphite that has a volume of 6.6cm³ and a mass of 14.7g is 2.23g/cm³.

Density is the measure of the mass of matter contained by a unit volume.

The density of a substance can be calculated by dividing the mass of the substance by its volume as follows:

Density = mass ÷ volume

According to this question, graphite has a volume of 6.6cm³ and a mass of 14.7g. The density of this substance can be calculated as follows:

Density = 14.7g ÷ 6.6cm³

Density = 2.23g/cm³

Therefore, 2.23g/cm³ is the density of the graphite.

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ANSWER

The volume of Argon gas is 5.60L

STEP-BY-STEP EXPLANATION:

Given information:

The number of atoms of argon = 1.5 x 10^23 atoms

To find the volume of Argon, we need to find the number of moles of argon, then, we assume the number of moles of argon to be x

To find the number of moles, we will need to apply the below formula

Recall that, Avogadro's number = 6.022 x 10^23

Since x represents the number of moles of argon gas, then, the mole of argon gas is 0.2498 mole.

The next step is to find the volume of Argon in liters

Recall that, at S.T.P, 1 mole is equivalent to 22.4L

Let x represent the volume in liters of argon

Then, this can be solved mathematically below

Therefore, the volume of Argon gas is 5.60L