I need help with this question please

The haematite is a common iron oxide compound, so from it is extracted the Iron.

Bauxite contains Aluminum in its composition, so the Aluminum is extracted from it.

The balanced equation is:

The equation is balanced because we have the same amount of elements in the reactants side (to the left of the arrow) and in the products side (to the right of the arrow).

B No, because Krypton has 8 valence electrons, and no electronegativity.

Other than fluorine gas, nothing else reacts with it. Commercially, krypton is used as the refueling gas for fluorescent lights. Some flash lights used in high-speed photography also make use of it.

Why does krypton not react?

This is due to the fact that Krypton's fourth energy level valence electrons are more thoroughly shielded by inner electrons than those of the lighter noble gases.

Krypton (Kr) is a chemical element that is a rare gas belonging to Periodic Table Group 18 (noble gases). It only forms a small number of chemical compounds. Krypton is monoatomic, colorless, odorless, and about three times heavier than air.

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Answer: 45g of NO2 are produced (third option or letter C).

Explanation:

The question requires us to calculate the amount of NO2, in grams, that would be obtained from 250 mL of 2.6 M HNO3 and excess of NO in the following chemical reaction:

To solve this problem, we must calculate the number of moles of HNO3 used, considering the volume and solution concentration given, then use the stoichiometry of the reaction to calculate the amount of moles of NO2 produced and, at last, use the molar mass of NO2 to convert the number of moles to mass.

Considering the definition of molarity, we can write:

Thus we need the volume of HNO3 solution used (250 mL = 0.250 L) and the molarity of the solution (2.6 M) to calculate the number of moles of HNO3 used in the reaction:

Therefore, 0.65 moles of HNO3 were used in the reaction.

Considering the stoichiometry of the reaction, given by the chemical equation, we can say that 2 moles of HNO3 are necessary to obtain 3 moles of NO2. Thus, we can write:

2 mol HNO3 --------------------- 3 mol NO2

0.65 mol HNO3 ---------------- x

Solving for x, we'll have:

Therefore, 0.98 moles of NO2 are obtained when 0.65 moles of HNO3 are used.

Next, we need to use the molar mass of NO2 (46.00 g/mol) to calculate the mass that corresponds to 0.98 moles of NO2:

1 mol NO2 ---------------- 46.00g NO2

0.98 mol NO2 ---------- y

Solving for y, we'll have:

Therefore, 0.98 moles of NO2 correspond to 45g of this compound.

The best option to answer this question is the third one (or letter C): 45g.

The first reaction 2Li(s) + Mg^2+(aq)---> 2Li^+(aq) + Mg(s) would occur because lithium is above magnesium in the electrochemical series.

We know that the possibility that one metal can be able to displace the other is only brought about by the position of the metals in the electrochemical series.

We know that the metals that are higher in the series are able to displace the metals that are lower in the series from an aqueous solution of the salts of the lower metal. In this case the lithium metal is above the magnesium metal so it can be able to displace it from solution.

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Answer:

Polar easterlies caused due to sinking, cool air above the poles

Explanation:

I hope this helps! If it does would you please mark me brainliest?

Answer:

The number 0.88400 has 3 significant figures.

Explanation:

The number 0.88400 has 3 significant figures because, zeros to the left of the first significant figure is not significant, and only for numbers greater that 1, the zeros to the right of the decimal point are significant.

Answer:

137.33 g/mol

Explanation:

Molar mass of PCl3 = 137. 332761 g/mol

Convert grams Phosphorus Trichloride to moles or moles Phosphorus Trichloride to grams

Molecular weight calculation:

30.973761 + 35.453*3

Black-eyed peas abundance in the sample as a whole is 39.6%.

What is the abundance percentage?

It is the proportion of an individual substance to all other identical substances of the same class.

(Occurrence of substance/Total Occurrence of Substances of Similar Kind) / 100 is the formula for percentage abundance.

Thus, the following formula can be used to determine the percentage of black-eyed peas in this sample:

There are 187 total beans and 113 black-eyed peas, for a total of 74.

Number of abundance individuals

= 74/187 x 100% = 39.6%

Thus, we may say that the sample contains 39.6% of the total amount of black-eyed peas.

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4.13x10^5 g are equal to 413 kg.

Knowing that 1 kg is equal to 1000 g we can calculate the grams that are equal to 413 kg:

So, the answer in scientific notation is 4.13x10^5g.

The theoretical yield of NH₃ based on the equation of the reaction is 1.82 g.

The theoretical yield of a substance is the amount of a substance that can be produced from the limiting reactants based on the equation of the reaction.

The equation of the reaction is given below:

N₂(g )+ 3 H₂ (g) ---> 2 NH₃ (g) ΔG = -9.9 kJ/mol

Moles of N₂ = 1 / 28

moles of N₂ = 0.0357 moles

Moles of H₂ = 1.5 / 2

Moles of H₂ = 0.75 moles

The limiting reactant is N₂

Mole ratio of N₂ and NH₃ is 1 : 3

Theoretical yield of NH₃ = 0.0357 * 3 * 17

Theoretical yield of NH₃ = 1.82 g

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The number of moles of argon = 7.835moles

Appropriate ratio = 1mole/22.4L

To get the number of moles of argon, we will use the conversion rate as shown:

1 mole = 22.4 L

Convert 175.5 liters of argon to moles

The equivalent number of moles of 175.5 liters of argon is 7.835 moles and the appropriate ratio is 1/22.4L

Answer:

1.227 x 10^-6

Explanation:

1 mole= 6.022 x 10^23 atoms

The [H⁺] of the solution is 5.01 * 10⁶ M

The [OBr⁻] of the solution is 5.01 * 10⁶ M

The [HOBr] of the solution is 0.01 M

The H⁺ and OBr⁻ ions come from the dissociation of the weak acid HOBr.

The value of Ka is 2.51 * 10⁻⁹

The value of pKa is 5.6

The pH of a solution is the negative logarithm of the hydrogen ion concentration of a solution.

pH = - log [H⁺]

From the given data:

pH of the solution = 5.3

solving for [H⁺];

[tex][H^{+}] = 10^{-pH}[/tex]

[tex][H^{+}] = 10^{-5.3}[/tex]

[H⁺] = 5.01 * 10⁶ M

The equation of the dissociation of the weak acid, HOBr is given below:

HOBr (aq) ⇄ H⁺ (aq) + OBr⁻ (aq)

Moles of H⁺ (aq) = OBr⁻ (aq)

Therefore, [H⁺] = [OBr⁻]

[OBr⁻] = 5.01 * 10⁶ M

The acid dissociation constant, Ka, is calculated as follows:

Ka = [H⁺] * [OBr⁻] /  [HOBr]

where  [HOBr] = concentration of the weak acid, HOBr.

At equilibrium  [HOBr] >>>  [H⁺] and [OBr⁻]

[HOBr] = 0.010 M

Ka = (5.01 * 10⁶ M *  5.01 * 10⁶ M) / 0.010 M

Ka = 2.51 * 10⁻⁹

pKa = - log (Ka)

pKa = - log (2.51 * 10⁻⁹)

pKa = 5.6

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This question is of longitudinal wave and the answer is given below:-

A. Crest

B. Wavelength

C. Amplitude

D. Trough

E. Cycle

F. Amplitude

In a longitudinal wave the particles are displaced parallel to the direction the wave travels. An example of longitudinal waves is compressions moving along a slinky.

Transverse waves cause the medium to move perpendicular to the direction of the wave. Longitudinal waves cause the medium to move parallel to the direction of the wave.

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When we balance a reaction (of neutralization in this case) like this, first, focus on the main element that forms hydroxides and acids. In this reaction, those elements are P and K.

We must have the same number of atoms on the right and on the left.

We have 1 P on both sides. Now the K aren't equal, so we multiply by 3 on the left side of the reaction.

After that, we focus on water to balance the Hydrogen and Oxygen elements. On the left, we have 6 H and 7 O, so we multiply H2O by 3 on the right.

To complete the question, you must fill in the gaps.

Answer: a. 1,3,1,3

Answer:

Explanation:

Here, we want to determine the empirical formula of the compound

We start by dividing the masses by the atomic mass of the individual elements

The next thing to do is to divide each of the values by the smallest value from above

Mathematically, we have that as:

The empirical formula of the compound is thus:

Products containing active drugs and additive chemicals are formulated as medicines for curative purposes as well as for improving the quality of food or food products.

Medicines are substances that are taken for the prevention or treatment of diseases.

Medicines are prepared from active drugs and additive chemicals.

Active drugs are substances that when taken into the body produce physiological changes in the body.

Drugs are usually used to prepare medicines.

Additive chemicals are added to substances to improve or enhance their qualities.

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They ask us to make a solution starting from a solution with a higher concentration, to find the final volume we will apply the following relationship of concentration and volume:

Where,

C1 is the initial concetration, 6.00M

V1 is the initial volume, 24mL

C2 is the final concentration, 1.50M

V2 is the final volumen, unknown

We clear V2 and replace the known data:

The solution has to be diluted until a volume equal to 96mL

Answer: 96mL

ANSWER

The value of Kc at 800K for the above reaction is 1.1642454865

EXPLANATION

Given that;

The number of moles of CO = 1 mol

The number of moles of H2O = 1 mol

The number of moles of CO2 = 0.519 mol

The volume of the vessel = 11L

To find the value of Kc, follow the steps below

Step 1: Write the equilibrium for the given reaction

Recall, that at equilibrium the mole of CO2 is 0.519 mol

Step 2: Find the mole of each reactant at equilibrium using the stoichiometry ratio

In the above reaction, 1 mole of CO reacts with 1 mole of H2O to give 1 mole of CO2 and 1 mole of H2

Let the number of moles of CO be x

The number of moles of CO is 0.519 mol

The next step is to find the number of moles of CO at equilibrium

At equilibrium, the number of mol of CO is calculated below

The number of moles of CO at equilibrium = 1 - 0.519

The number of moles of CO at equilibrium = 0.481 mol

Using stoichiometry ratio, the number of mole o water at equilibrium will also be 0.481 mol

Also, the number of moles of hydrogen at equilibrium is 0.519 mol

Step 3: Find Kc by substituting the calculated values into the formula

According to the descriptions [(a)-(h)] with each of the following elements:

(a) Cu (b) P (c) Kr (d) Cs (e) Al (f) Sb (g) Cl (h) Sr

A material is considered an element if it cannot be chemically divided into smaller substances. An element can also be a crucial part of anything or a natural environment. As a noun, element has numerous more meanings. An element is a substance in chemistry that can never be further divided.

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The change in the system's Gibbs free energy that occurs during a reaction is thus equal to the change in the system's enthalpy minus the change in the product of the temperature times the entropy of the system.

Free energy [tex]\Delta[/tex] G = [tex]\Delta[/tex] H - T [tex]\Delta[/tex] S = -9.72 -200 * -26.1 =  5210.28 J

[tex]\Delta[/tex] G = change in Gibbs Free Energy

[tex]\Delta[/tex]H = change in enthalpy

T = temperature in Kelvin

[tex]\Delta[/tex] S = change in entropy

[tex]\Delta[/tex] G = [tex]\Delta[/tex] H - T [tex]\Delta[/tex] S = -9.72 -200 * -26.1 =  5210.28 J

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Number 1

The complete reaction:

Magnesium oxide + water

MgO + H2O = Mg(OH)2

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

Number 2

The reaction:

2 Na + Cl2 = 2 NaCl

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

Number 3

The reaction:

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

Number 4

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

Number 5

In general, the ionizing power increases while the penetration power decreases as mass increases. Alpha particles have the highest mass when merely comparing the three most prevalent forms of ionizing radiation.

The mass of an alpha particle is around 8,000 times more than that of a beta particle and is roughly four times that of a proton or neutron. The alpha particle has the strongest ionizing strength and the greatest capacity to harm tissue because of its huge mass. However, because of their size, alpha particles are less able to penetrate solid objects.

Although beta particles have significantly more penetrating capability due to their smaller size than alpha particles, they have far less ionizing power (less capacity to harm tissue).

Gamma rays are a high energy kind of electromagnetic radiation rather than particles (like x-rays, except more powerful). Energy that has neither mass nor charge are gamma rays. Gamma rays can penetrate many inches of thick material (like lead) and are therefore shielded by doing so. A human body may allow gamma rays to pass through completely without interacting with anything.

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The mole ratio between sodium nitrate and sodium oxide is 2:1.

The mole ratio between two or more components of a reaction is the stoichiometric number of moles of each component.

The stoichiometric number of mole of a species of a chemical equation is the coefficient of the species when the equation is balanced.

A balanced equation is one in which the number of atoms of elements in the equation is conserved before and after the reaction.

Looking at the equation:

[tex]2NaNO_3 + PbO -- > Pb(NO_3)_2 + Na_2O[/tex]

The number of atoms of each element before and after the reaction is the same.

The coefficient of sodium nitrate is 2.

The coefficient of sodium oxide is 1.

Thus, the mole ratio between sodium nitrate and sodium oxide is 2:1.

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The 22 gallons is equal to  83353.6 ml.

The conversion technique is the technique of converting a business's accounting from unmarried access to double entry.

Calculation:-

1 gal = 128 oz

1 fl oz = 29.6 mL

22 gallons = 128 × 22

                    = 2816 0z

1 fl oz = 29.6 mL

2816 0z = 29.6 × 2816 ml

              = 83353.6 ml

A unit conversion expresses the equal property as a unique unit of dimension. as an instance, time may be expressed in mins in preference to hours, at the same time as the distance may be transformed from miles to kilometers, or ft, or every other measure of period.

Conversion price receives its call due to the fact the prices that make up conversion fees are all of the costs incurred to transform uncooked fabric into a completed top. these fees are direct labor and manufacturing overhead.

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The coffee from the sweetest coffee to the least-sweet coffee is ranked as follows:

i, ii, iv, iii.

The correct option is D.

Coffee is a darkly colored, bitter, and slightly acidic drink prepared from roasted coffee beans. The coffee has a stimulating effect on humans, primarily due to its caffeine content.

We will compare which coffee is the sweetest by dividing the masses of coffee in ii and iii by 2 to determine how much sugar there are per 100 g of coffee:

ii. 10 g of sugar added to 200 g of coffee will then be 5 g of sugar per 100 g of coffee.

iii. 4 g of sugar added to 200 g of coffee will then be 2 g of sugar per 100 g of coffee

Therefore we have that :

i. 10 g of sugar per 100 g of coffee

ii. 5 g of sugar per 100 g of coffee

iii. 2 g of sugar per 100 g of coffee

iv. 4 g of sugar per 100 g of coffee

In conclusion, we have that the sweetest coffee is i because it has the biggest amount of sugar per 100 g of coffee, then we have ii, iv, iii in that order.

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This is the full question here;

In a coffee shop, the following coffee samples are prepared for customers.

i. 10 g of sugar added to 100 g of coffee

ii. 10 g of sugar added to 200 g of coffee

iii. 4 g of sugar added to 200 g of coffee

iv. 4 g of sugar added to 100 g of coffee

Based on the amount of sugar added, which sequence ranks the coffee from the sweetest coffee to the least-sweet coffee?

i, ii , iii, iv

iii, iv, ii, i

iv, i, ii, iii

i, ii, iv, iii

The pH of a formic acid solution that contains 1.37% formic acid by mass is  2.1364

This is further explained below.

Generally, A liquid combination known as an acidic solution is created when water and hydrogen ions react.

The Brasted-Lowry hypothesis states that whereas bases "receive" hydrogen protons, acids "give" hydrogen protons. Different solutions have different levels of acidity.

Molarity of formic acid = (density* 1000) /(100 * molar mass )

[tex]=1.35^* 1.01 \mathrm{~g} / \mathrm{mL} * 1000 \mathrm{~mL} / \mathrm{L} /(100 * 46 \mathrm{~g} / \mathrm{mol}) \\\\\C=0.2964 M[/tex]

We know that Ka for formic acid = 1.8*10-4

[tex][H+] = \sqrt{Ka*C}[/tex]

[tex]= ( 1.8*10^{-4} * 0.2964 M )1/2[/tex]

= 0.0073 MpH = -log(0.0073M)

= 2.1364

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