3. A 500Kg block of aluminium has a volume of 0.185m3. Calculate it's density.

(A)This reaction does not increase the solubility of iron(II) carbonate.

(B) In this reaction it has no effect on how soluble it is.

(C) In this reaction it doesn't directly affect FeCO₃, it has no effect on how soluble it is.

(D)In this reaction it has no effect on how soluble it is.

(E)This reaction does not increase the solubility of iron(II) carbonate.

Therefore, the reaction that does not increase the solubility of iron(II) carbonate is reaction A) \(Fe^{2+\) (a q) + OH- (a q) « Fe OH+ (a q).

Let's analyze each reaction and its impact on the concentration of \(CO_(3)^{2-}\) ions:

A) \(Fe^{2+}\)(a q) + OH- (a q) « Fe OH+ (a q)

FeOH+ is produced during this reaction, although it has no direct impact on how soluble FeCO₃ is. It has nothing to do specifically with the precipitation or dissolution of FeCO₃.

B) \(CO_(3)^{2-}(a q) + H^+ (a q)\) ⇒ \(HCO^{3-}\) (a q)

In this process, \(CO_3^{2-}\) ions are changed into \(HCO^{3-}\)ions. Since it doesn't directly affect \(FeCO_3\), it has no effect on how soluble it is.

C) \(HCO^{3-} (a q) + H^+ (a q)\) « \(H_2 CO_3\) (a q)

In this process, bicarbonate ions \((HCO^{3-})\) are converted into carbonic acid \((H_2CO_3\). Since it doesn't directly affect FeCO₃, it\(H_2O\) has no effect on how soluble it is.

D) \(H_2CO_3(a q)\)« \(CO_2\) (g) + \(H_2O\) (l)

In this process, carbonic acid \((H_2CO_3\)) is transformed into water () and carbon dioxide (\(CO_2\)) gas. Since it doesn't directly affect FeCO₃, it has no effect on how soluble it is.

E) \(Fe OH^+ (a q) + OH^-\) «\(Fe(OH)_2\) (s)

This reaction involves the precipitation of \(Fe(OH)_2\) (iron(II) hydroxide) from Fe OH+ ions and OH- ions. It consumes OH- ions and reduces their concentration. It does not directly affect the concentration of \(CO_3^{2-}\)ions. Therefore, this reaction does not increase the solubility of iron(II) carbonate.

Based on the analysis, the reaction that does not increase the solubility of iron(II) carbonate is reaction A) \(Fe^{2+ }(a q) + OH^- (a q)\)« \(Fe OH^+\) (a q).

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Answer:

- Water from beaker will move to the tube

Explanation:

Total percentage of water in the beaker;

\( = { \tt{100\% - 5\%}} \\ = { \tt{95\%}}\)

Total percentage of water in dialysis tube;

\({ \tt{ = 100\% - 15\%}} \\ = { \tt{85\%}}\)

So, there is much water concentration in the beaker than the dialysis tubing, this causes a determined percentage of water to diffuse to the tubing, and determined percentage of salt to move from tubing to the beaker.

Percentage of water moving to tubing;

\({ \tt{ = 95\% - 85\%}} \\ = { \tt{10\%}}\)

Percentage of salt moving from tubing to beaker

\({ \tt{ = 15\% - 5\%}} \\ { \tt{ = 10\%}}\)

Answer:

QN 1

Explanation:

WHEN A SOLID IS HEATED ITS ATOMS VIBRATE FASTER ABOUT THEIR FIXED POINTS. HEAT CAUSES THE MOLECULES TO MOVE FASTER HEAT ENERGY IS CONVERTED TO KINETIC ENERGY WHICH MEANS THAT THE VOLUME OF GAS INCREASES MORE THAN THE VOLUME OF A SOLID OR LIQUID.

The identity of the unknown metal would be potassium.

At STP, 1 mole of gas = 22.4 liters of 22400 mL

Thus, 251 mL would be:  251/22400 = 0.0112 mol of gas.

X and hydrochloric acid react to produce hydrogen according to the following chemical equation:

\(X + 2HCl --- > XCl_2 + H_2\)

The mole ratio of X and hydrogen gas is 1:1. Thus, the equivalent mole of X that reacted would be 0.0112 mol.

Recall that: mole = mass/molar mass

Molar mass = mass/mole = 0.45/0.0112 = 40.18 g/mol

In other words, the molar weight of the metal is approximately 40. The metal with a molar weight that is close to 40 is potassium. Thus, X is potassium.

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The molar mass of a compound is defined as the sum of the molar masses of the various elements that makes up the compound.

The molar mass of the medication, C₁₇H₂₀O₅S can be obtained as follow:

Molar mass of C₁₇H₂₀O₅S = (17 × 12) + (20 × 1) + (5 × 16) + 32

Molar mass of C₁₇H₂₀O₅S = 204 + 20 + 80 + 32

Molar mass of C₁₇H₂₀O₅S = 336 g/mol

The number of mole of medication in one tablet can be obtained as follow:

Mole = mass / molar mass

Number of mole of one tablet = 0.125 / 336

Number of mole of one tablet = 0.000372 mole

The number of mole of firocoxib that Dobby takes each day can be obtained as follow:

Mole = mass / molar mass

Number of mole of tablets taken each day = 0.1875 / 336

Number of mole of tablets taken each day = 0.000558 mole

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IR spectroscopy measures the interaction of matter (your sample) with infrared light, which causes vibration in the covalent bonds of molecules, which can be interpreted to determine the functional groups in your compound.

To take an IR in lab, you need to select a suitable solvent for your sample that does not absorb in the same region as your sample.

You also need to prepare a background sample (the same solvent without your sample) to correct for any interference from the solvent.

To take an IR in the lab, you will need an IR spectrophotometer and a sample holder.

The sample holder is a thin plastic or glass film that will hold your sample for analysis.

The spectrophotometer will measure the absorbance of your sample over a range of wavelengths, and then plot the resulting spectrum of your sample.

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Answer:

The timber companies removing all the trees from entire hillside when they are harvesting logs is a practice that could cause the following when it is time to plant in spring:

1. It could affect the quality of plant needed nutrients in the soil and beneficial microorganism population in the soil which could impact negatively the planting season.

2. Trees serves as protection of soil nutrients against wind erosions, so the soil nutrients would be affected.

The farmers tilling the soil means preparing the soil for a farming season as the following effect:

1. Helps control weed for the planting season.

2. This practice could further encourage soil erosion if not done well.

3. Tilling the soil could make leftover plants from the felling of trees mix well with the soil and also add nutrients to the soil when they decay.

Answer:

first identify the cation and write down its symbol and charge. Then, identify the anion and write down its symbol and charge.

Explanation:

Answer:

You can test whether or not the object is more or less dense than what by having, “80mL” (as long as the amount of water is easy to read and doesn’t overflow). You take all the object you want to test for, slowly and carefully drop the object into the water. If the Object sinks it is more dese and if it floats it is less dense. To find the exact density of the tested objects look at how much water is being displaced in the container and subtract the amount of water from that to get volume. Then, (or before putting the object into water) weight the object to find its mass. Next you divide the mass in mL by the volume to get the exact density.

Explanation:

Balanced

Moles of CaCl_2=0.425mol

1 mol CaCl_2 producees 1 mol LiCl

Moles of LiCl

The equation is

\(\\ \tt{:}\dashrightarrow LiOH+CalCl_2\longrightarrow LiCl+Ca(OH)_2\)

1mol of LiCl needs 1 mol CaCl_2

Then

0.425mol of CaCl_2 will produce 0.425mol LiCl

20,000 is the correct answer

What is empirical formula ?

The empirical formula of a chemical compound is the simplest ratio of the number of atoms of each element present in a compound. It represents the smallest whole number ratio of the elements in a compound and gives an indication of the relative proportions of the elements. The empirical formula is not necessarily the same as the molecular formula, which represents the actual number of atoms in a molecule. The molecular formula may be a multiple of the empirical formula and can be determined by analyzing the compound's molecular weight.

Multiply each by 20,000, then we have

C: 2.48925 x 20,000 = 49,785

H: 3.9901 x 20,000 = 79,802

O: 1.000 x 20,000 = 20,000

Multiply each element by in order to have them all reach the smallest whole number will be 20,000.

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Answer: The answer is 2

Explanation:

The mole ratio of sodium to chlorine in sodium chloride is 1:1.

Mole ratio in chemistry is a conversion factor that relates the amounts in moles of any two substances in a chemical reaction.

The numbers in a conversion factor come from the coefficients of the balanced chemical equation. According to this question, a chemical compound with formula NaCl is given.

The mole ratio of sodium to chlorine in the compound is 1:1 because 1 mole of sodium and chlorine is present each.

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To balance a equation, we need to have the same number of atoms of each elements on both sides of the chemical reaction (reactant and product side).

I rewrote this substance(Zn(CH3COO)2) for better understanding.

__Zn + __HC2H3O2 → __Zn(C2H3O2)2 + __H2

Reactant side unbalanced:

Zn - 1

H - 4

C - 2

O - 2

Products side unbalanced:

Zn - 1

C - 4

H - 8

O - 4

Obs: when there is a part inside the parentheses, all the atoms are multiplied by the number outside the parentheses.

Now let's balance the equation changing the stoichiometric coefficient.

Zn + 2 HC2H3O2 → Zn(C2H3O2)2 + H2

Reactant side:

Zn - 1

H - 8

C - 4

O - 4

Product side:

Zn - 1

H - 8

C - 4

O - 4

Now the equation is balanced.

Answer: Zn + 2 HC2H3O2 → Zn(C2H3O2)2 + H2

Answer:

Shown below

Explanation:

Molar mass: 149.09

% Nitrogen: 28.2

% Hydrogen: 8.1

% Oxygen: 43.0

% Phosphorus: 20.8

Answer:

the correct answer is C. A new substance forms when the batter is cooked

Explanation:

I got it right on edge 2021. Hope this helps

A 30-day supply of Levoxyl at a dosage of one 13 μg tablet per day contains 0.39 mg of Levoxyl.

For a patient taking one 13 μg tablet of Levoxyl per day, the total amount of levothyroxine they are receiving is 13 micrograms. To calculate the total amount in a 30-day supply, we simply multiply this amount by 30.

13 μg/tablet x 1 tablet/day x 30 days = 390 μg

Note that the microgram (μg) is a unit of mass equal to one millionth of a gram, while the milligram (mg) is a unit of mass equal to one thousandth of a gram. To convert μg to mg, we divide by 1000:

390 μg / 1000 = 0.39 mg

Levoxyl is a medication used to treat hypothyroidism, a condition where the thyroid gland doesn't produce enough hormones to regulate the body's metabolism. The active ingredient in Levoxyl is levothyroxine sodium, which is a synthetic form of the hormone thyroxine (T4).

Levoxyl tablets are available in several strengths, ranging from 25 mcg to 300 mcg. The recommended dosage depends on the patient's age, weight, and the severity of their hypothyroidism. In general, adults with normal thyroid function usually require about 1.6 mcg of levothyroxine per kilogram of body weight per day.

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Answer:

E.Law of conservation of mass

Explanation:

molar mass of KHP ( C8H5O4K)= 8*12+5+4*16+39=204

( atomic weights : C=12, H=1, K=39 and O= 16)

moles of KHP= mass/molar mass =  1.513/204 =0.0074

The reaction between KHP and NaOH is

KHC8H4O4(aq) + NaOH(aq) => KNaC8H4O4(aq) + H2O(l)

1 mole of KHP requires 1 mole of NaOH;

moles of KHP=0.0074

moles of NaOH= 0.0074

concentration of NaOH= moles/ Volume in L, 1000ml= 1L, 14.8ml= 14.8/1000L=0.0148L

concentration of NaOH=0.0074/0.0148=0.5M

The molarity of NaOH is 0.5M

Molar Mass:

In chemistry, the molar mass of a compound is defined as the mass of a sample of that compound divided by the amount of substance. This is the number of moles of that sample measured in moles.

Molarity:

Molarity is used to describe the concentration of a solution. Molarity, also called molarity, is the number of moles of solute (dissolved substance) per liter of solution.

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Answer:

It is called a negatively charged ion

Answer: A anion or you can call it a ion

To synthesize an alkyl halide through an electrophilic addition reaction, a neutral organic starting material such as an alkene is typically used. The alkene can react with a halogen, such as chlorine or bromine, in the presence of a catalyst like iron or aluminum chloride. The resulting intermediate is an additional product that contains both the halogen and the alkene.

For example, if we start with the neutral organic starting material of propene, we can synthesize the alkyl halide 1-chloropropane through an electrophilic addition reaction with chlorine gas and aluminum chloride as the catalyst:

CH3CH=CH2 + Cl2 → CH3CH(Cl)CH3

The structure of the neutral organic starting material, propene, would be:

CH3CH=CH2

The electrophilic addition reaction involves the double bond in ethene reacting with a halogen molecule (in this case, Br2), resulting in the formation of 1-bromoethane.

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Explanation:

TUU-PQVH-MFG LINK for them who truely interested in Paranormal and have any doubt on Paranormal

(a) The  reaction equation for the reduction of H₂O₂ at the gold electrode can be; H₂O₂ + 2H⁺ + 2e⁻ → 2H₂O. ( b) The direction of electron flow at the interface is from the gold electrode to the H₂O₂ molecules.

The reaction equation for the reduction of H₂O₂ at the gold electrode can be written as follows:

H₂O₂ + 2H⁺ + 2e⁻ → 2H₂O

In this equation,  H₂O₂ is being reduced by gaining two electrons (2e⁻) and two protons (2H⁺) to form water (H₂O).

The direction of electron flow at the interface is from the gold electrode to the  H₂O₂ molecules. When the gold electrode is immersed in a solution containing  H₂O₂, the electrode acts as the cathode. Electrons are transferred from the gold electrode to the  H₂O₂ molecules during the reduction process. This electron flow allows for the reduction of  H₂O₂ to water.

The rotation of the gold disc electrode at a high speed (3000 rpm) creates a vigorous flow and promotes mixing of the solution around the electrode. This results in a thinner diffusion layer, reducing the thickness to just 10 microns. The thinner diffusion layer enhances the mass transfer of  H₂O₂ to the electrode surface, increasing the efficiency of the reduction reaction.

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Answer:

47.34L

Explanation:

Using the general gas equation as follows:

PV = nRT

Where;

P = pressure (atm)

V = volume (L)

n = number of moles (mol)

R = gas law constant (0.0821 Latm/molK)

T = temperature (K)

According to the information provided in this question,

V = ?

P = 75.2 kPa = 75.2 × 0.00987 = 0.74atm

T = 63°C = 63 + 273 = 336K

n = 1.27mol

Using PV = nRT

V = nRT/P

V = 1.27 × 0.0821 × 336 ÷ 0.74

V = 35.034 ÷ 0.74

V = 47.34L

Answer:

D

Explanation:

I took the test

Answer:

D took the test

Explanation:

When considering the precise mass, the particle has the greatest mass is the neutrons.

The Neutron is the heaviest among all the subatomic particles with the  mass of the  1.0087 amu, and the proton has the mass of the 1.0073 amu. The Positron and the electron both have the mass of the 0.00055 amu.

The difference in between the mass  of the neutron and the proton is very small. This is the reason that they are both have the relative mass of the one atomic mass unit. The mass of the neutron in the grams  is the  1.674 × 10⁻²⁴ grams.

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The identity of the gas sample that weighs 4.84g and occupies a volume of 0.918L at 35 °C and 850torr is CHCl₃ with molar mass of 119.4g/mol (option A).

The number of moles of an ideal gas can be calculated using the ideal gas law equation as follows:

PV = nRT

Where;

According to this question, a sample of gas weighs 4.84g and occupies a volume of 0.918L at 35 °c and 850 torr. The number of moles can be calculated as follows:

1.12 × 0.918 = n × 0.0821 × 308

1.028 = 25.286n

n = 0.041moles

molar mass of gas = 4.84g ÷ 0.041moles

molar mass = 119.4g/mol

Therefore, the identity of the gas is CHCl₃.

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Answer:

The rollercoaster has the lowest kinetic energy at the top of the hill.

The rollercaoster has the highest kinetic energy at the bottom of the hill.

Explanation:

The kinetic energy of any solid body in motion is usually computed using this formula:

K.E = \(\frac{1}{2}mv^2\)

From this, we can see that it varies based on two major parameters - The mass of the moving object and the velocity of the moving object.

We can assume that the mass of the rollercoaster is constant since no one gets off and it does not shrink in its size during the ride.

This means that the variations in the K.E are mainly coming from its velocity.

At the top of the hill, the rollercoaster is moving at its slowest pace. hence, it has the lowest kinetic energy at the top of the hill.

However, at the bottom of the hill, the rollercoaster is moving its fastest, hence it has the highest kinetic energy at the bottom of the hill.

Explanation:

REFER TO THE ATTACHMENT ABOVE.....

Answer:

1.0 something depending on your periodic table.

Explanation:

You are given atoms. Not molecules. The mass is what you would read from the periodic table. 1.000 in some form is the answer.

In nature, Hydrogen is found as H2 everywhere except in the sun or a star. The molecular mass (not the atomic mass) would be 2.000 something.