what is acidity of nh4oh​

KBr < NaCl < MgO <Na2O

KBr < NaCl>The formulation is MgO. Magnesium oxide could have the most important lattice power as it has the most important appeal among the 2 ions.

Mg2+ ion has a smaller length whilst in comparison to Ca2+ advert thus MgO has the very best lattice power some of the given compounds.

Li¹⁺ F¹⁻

K¹⁺ Br¹⁻

Na¹⁺ Cl¹⁻

Because the compounds all have the identical fee we want to have a take a observe their role at the periodic table.

KBr < NaCl < MgO <Na2O

K is the bottom ion withinside the group, then comes Na, and at the very best is Li.

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Aluminum wiring can be a fire hazard because it can oxidize, or combine with oxygen. Therefore, 4moles of aluminium react with 3 moles of oxygen.

Aluminum (Al), also written aluminium, is a chemical element that is a light silvery white metal in Periodic Group 13 (IIIa, or the boron group). Aluminum is the most common nonferrous metal and the most prevalent metallic element in the Earth's crust.

Aluminum is never found in its metallic form in nature due to its chemical activity, but its compounds are found to varying degrees in practically all minerals, flora, and animals.

4Al + 3O\(_2\) \(\rightarrow\) 2Al\(_2\)O\(_3\)

mole of oxygen =3 moles

the mole ratio between aluminium and oxygen is 4:3.

moles of aluminium = 4moles

Therefore, 4moles of aluminium react with 3 moles of oxygen.

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According to World Population Review 2022 the safest country to live are as follows.

These countries are listed safe by calculating global peace index.

This index measures the nation's and regions peacefulness and is finally reviewed by Institute of Economic and Peace (IEP).

The role of IEP is to measure peace at the worldwide and country level degree and lets us to evaluate the social, political and financial elements that create peace. Each year the Institute for Economics and Peace produces the Global Peace Index, the world’s main degree of countrywide peacefulness, rating 163 nations in line with their ranges of peace.

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The significance of polar and non-polar amino acids lies in their interactions within a protein structure. Polar amino acids are typically found on the surface of the protein, where they interact with water molecules and other polar molecules. Non-polar amino acids, on the other hand, are typically found in the interior of the protein, where they interact with other non-polar amino acids through hydrophobic interactions.

Amino acids are the building blocks of proteins, and they can be categorized as either polar or non-polar. Polar amino acids have a hydrophilic (water-loving) nature due to their polarity, while non-polar amino acids have a hydrophobic (water-fearing) nature due to their lack of polarity.

The balance between polar and non-polar amino acids is crucial in determining the overall structure and function of a protein. If there are too many polar amino acids in the interior of a protein, it may become unstable and unfold. Conversely, if there are too many non-polar amino acids on the surface of a protein, it may not be able to interact effectively with other molecules.

Overall, the significance of polar and non-polar amino acids lies in their ability to contribute to the stability and function of proteins. Understanding the properties of these amino acids is important in fields such as biochemistry and drug development.

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Solid lead nitrate is heated and forms solid lead oxide, gaseous nitrogen dioxide, and oxygen then it form of decomposition reaction

Lead nitrate is a white color inorganic powder with the chemical formula Pb ( NO₃)₂ when Lead nitrate decomposes it produces Lead oxide a yellow colored oxide of  brown colored Nitrogen dioxide gas, and colorless Oxygen gas and also it gives yellow colors

When lead nitrate is heated it decomposes to form lead oxide, nitrogen dioxide and oxygen from the reaction, we can see that lead nitrate decomposes on heating and forms lead oxide, nitrogen dioxide and oxygen thus, lead nitrate on decomposition gives lead oxide, nitrogen dioxide and oxygen and the lead nitrate and when solid lead nitrate heated it decomposes to produce light yellow solid lead monoxide, reddish-brown nitrogen dioxide gas and colourless oxygen gas

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Here, 3x10^23 molecules of water are equal to 0.5 moles of water.

There are many ways to find the number of moles of a compound, but to convert the number of molecules of water to moles of water, Avogadro's number needs to be known.

The formula used to find the number of moles is:

moles = (Number of molecules) / (Avogadro's number)

As Avogadro's number = 6.022 x 10^23 molecules/mole.

The given number of molecules is 3x10^23.

Putting the values in the above equation;

(3 x 10^23 molecules of water) / (6.022 x 10^23 molecules/mole) = 0.498 moles of water

Rounding off the value gives 0.5 moles of water.

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Answer:

- Anode: Co3+ | Co2+

- Cathode: Ni | Ni2+

Explanation:

The anode is where oxidation reaction occurs, and the cathode is where reduction reaction occurs.

From the table of reduction potencials, we find that:

- Co reaction:

- Ni reaction:

Now, to find out which one is the anode and which one is the cathode, it is necessary to compare the reduction potencials.

The reaction of Ni have negative potentials, so Ni will be the anode and Co will be the cathode.

The elements arranged in order of increasing electronegativity are: tin, tellurium, antimony, iodine.

Electronegativity is a measure of an atom's ability to attract electrons towards itself in a chemical bond. In general, electronegativity tends to increase as you move across a period from left to right on the periodic table and decrease as you move down a group.

Among the given elements, tin (Sn) has the lowest electronegativity. It is a metal and tends to have lower electronegativity values compared to nonmetals. Tellurium (Te) has a slightly higher electronegativity than tin but lower than the remaining two elements.

Antimony (Sb) has a higher electronegativity than tellurium. It is a metalloid and has intermediate electronegativity values. Finally, iodine (I) has the highest electronegativity among the given elements. It is a nonmetal and tends to have higher electronegativity values compared to metals and metalloids.

Therefore, the elements arranged in order of increasing electronegativity are: tin, tellurium, antimony, iodine.

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The concentration of arsenic would be 26,13 ppm

To find the concentration in PPM, we can use this following formula:

(amount of solute ÷ amount of whole solution) × 1,000,000

The most crucial consideration when running a PPM calculation is to ensure that the units you select for the solution and the substance of interest are consistent with one another. For example, if you want to calculate the concentration of a solute in a solution, you can't just add up the solute's mass and the volume of the solution; you need to do the calculations using mass and mass or volume and volume.

Thus, the concentration of arsenic would be:

(0.0597 ÷ 2285) × 1,000,000 = 26,13 ppm

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The phrase "like dissolves like" refers to the principle that polar substances tend to dissolve in other polar substances, while nonpolar substances tend to dissolve in other nonpolar substances. This is because polar molecules have an unequal distribution of electrical charge, with a positive end and a negative end, and therefore interact strongly with other polar molecules through dipole-dipole interactions or hydrogen bonding.

Similarly, nonpolar molecules have a symmetrical distribution of electrical charge and do not interact well with polar molecules, but rather with other nonpolar molecules through London dispersion forces or van der Waals interactions. Therefore, when choosing a solvent to dissolve a particular substance, it is important to consider the polarity of the substance and choose a solvent that has similar polarity to ensure efficient dissolution.

Hi! "Like dissolves like" is a phrase used to describe the concept that polar substances tend to dissolve in polar solvents, and nonpolar substances tend to dissolve in nonpolar solvents. This occurs because polar molecules have regions of positive and negative charge, allowing them to interact and bond with other polar molecules. Nonpolar substances, on the other hand, have a more even distribution of charge, making them more likely to dissolve in substances with similar properties.

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The number of moles of chlorine in a 67.2 liter sample at STP (Standard Temperature and Pressure), is approximately 3 moles.

We need to use the ideal gas law and the molar volume of a gas at STP.

STP conditions are defined as a temperature of 273.15 Kelvin (0 degrees Celsius) and a pressure of 1 atmosphere (1 atm).

The molar volume of a gas at STP is approximately 22.4 liters/mol.

Given:

Volume of the sample = 67.2 liters

We can use the formula:

n = V / Vm

where:

n = number of moles

V = volume of the sample

Vm = molar volume at STP (22.4 liters/mol)

Now, let's calculate the number of moles:

n = 67.2 L / 22.4 L/mol

n ≈ 3 moles

Therefore, there are approximately 3 moles of chlorine in a 67.2 liter sample of chlorine at STP.

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If 10.0 grams of ammonium chloride is added to 1000 mL of water, the temperature would drop by 20.9°C.

At normal temperature, aluminium and chlorine do not react quickly, but when heated, the reaction is ferocious. Aluminum chloride, a white powder that emits fumes into the atmosphere and reacts with water to produce aluminium oxide and HCl gas, is the end product.

q = m × c × ΔT

Since the water is the solvent in this case, we can assume that the specific heat capacity of the solution is the same as the specific heat capacity of water (4.184 J/g·°C).

m = 5.00 g

ΔT = -4.2°C

q = m × c × ΔT

q = (5.00 g) × (4.184 J/g·°C) × (-4.2°C)

q = -879.36 J

Now, we can use the amount of heat released by the 5.00 grams of ammonium chloride to find the temperature change for 10.0 grams of ammonium chloride in 1000 mL of water:

m = 10.0 g

V = 1000 mL = 1000 g (since 1 mL of water has a mass of 1 g)

q = -879.36 J (from the first part)

We can solve for ΔT:

q = m × c × ΔT

ΔT = q / (m × c)

ΔT = (-879.36 J) / (10.0 g × 4.184 J/g·°C)

ΔT = -20.9°C

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The electron could be excited to a higher energy level and then returned to ground state as shown in the image attached.

According to the Bohr model of the atom, electrons are arranged in energy levels. The electrons that are in the lower energy levels then to absorb energy and move up to the excited states which are higher energy levels which is the crux of the model here.

Subsequently, the electron that was excited would drop down to the ground state and then loose the energy that was absorbed during excitation in the form of a visible light.

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The wavelength of the spectral line produced when an electron in a hydrogen atom undergoes a transition from energy level n = 4 to energy level n = 2 is 486.1 nanometers.

The wavelength of the spectral line produced when an electron in a hydrogen atom undergoes a transition from energy level n = 4 to energy level n = 2 is 486.1 nm.

The formula for calculating the wavelength of a spectral line in a hydrogen atom is:

λ = 1/R(n1^2 - n2^2)

where:

λ is the wavelength in nanometers

R is the Rydberg constant, which is equal to 1.09677 * 10^7 m^-1

n1 is the initial energy level

n2 is the final energy level

In this case, n1 = 4 and n2 = 2. Substituting these values into the formula, we get:

λ = 1/(1.09677 * 10^7 m^-1)((4^2) - (2^2))

λ = 1/(1.09677 * 10^7 m^-1)(16 - 4)

λ = 1/(1.09677 * 10^7 m^-1)(12)

λ = 4.861 * 10^-7 m

λ = 486.1 nm

Therefore, the wavelength of the spectral line produced when an electron in a hydrogen atom undergoes the transition from energy level n = 4 to energy level n = 2 is 486.1 nm.

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The concentration of iron(iii) chloride contaminant in the original groundwater sample is (C1 × V1 / V) × 162.2 g/mol.

Given that the chemist adds m silver nitrate solution to the sample until silver chloride stops forming. He then washes, dries, and weighs the precipitate. He finds he has collected of silver chloride. Let us calculate the concentration of iron(iii) chloride contaminant in the original groundwater sample.Calculating the concentration of iron(iii) chloride contaminant in the original groundwater sample

Here is the given information;

Mass of silver chloride precipitate = m grams

Volume of groundwater sample taken = V ml

Volume of AgNO3 solution used = V1 ml

Concentration of AgNO3 solution = C1

Molar Mass of AgCl precipitated = 143.5 g/mol

The molarity of AgNO3 solution is given as;

Molarity of AgNO3 = Number of equivalents / Volume of solution in liters

We know that 1 mole of AgNO3 gives 1 mole of AgCl, i.e., AgNO3 is equivalent to AgCl.Therefore, the number of equivalents of AgNO3 is the same as the number of equivalents of AgCl.

Number of equivalents of AgNO3 = C1 × V1

Number of equivalents of AgCl = m / 143.5 g/mol

Concentration of FeCl3 = (Number of equivalents of FeCl3 / Volume of sample in liters) × Molar mass of FeCl3

Number of equivalents of FeCl3 = Number of equivalents of AgNO3

Number of equivalents of FeCl3 = C1 × V1

Concentration of FeCl3 = (C1 × V1 / V) × Molar mass of FeCl3

Concentration of FeCl3 = (C1 × V1 / V) × 162.2 g/mol

Hence, the concentration of iron(iii) chloride contaminant in the original groundwater sample is (C1 × V1 / V) × 162.2 g/mol.

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Answer:

F,A

Explanation:

The final gas volume, O, could be either larger or smaller than 2.96 L, depending on the final pressure and temperature. While heating the gas to a higher temperature, O could be larger than 2.96 L, but it could also be smaller.

The final gas volume, O, could be either larger or smaller than 2.96 L, depending on the final pressure and temperature. To understand why, we can look at the ideal gas law equation, PV = nRT. In this equation, P represents pressure, V represents volume, n represents the number of moles of gas, R is the gas constant, and T represents temperature.

Let's analyze the situation given in the question. We have a sample of xenon gas at a temperature of 306 K and a pressure of 0.847 atm, occupying a volume of 2.96 L. Now, if the pressure of the gas is decreased, while at the same time it is heated to a higher temperature, the final gas volume, O, could be either larger or smaller than 2.96 L.

If we decrease the pressure while keeping the temperature constant, according to Boyle's law, the volume of the gas will increase. So, in this case, O would be larger than 2.96 L. However, if we simultaneously increase the temperature while decreasing the pressure, the situation becomes more complex. The combined effect of the pressure decrease and temperature increase could lead to different outcomes for the final volume.

For example, if the pressure decrease is significant and the temperature increase is relatively small, the volume may still increase, resulting in O being larger than 2.96 L. On the other hand, if the pressure decrease is small and the temperature increase is significant, the volume may actually decrease, resulting in O being smaller than 2.96 L.

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Heat a beaker of water when a gas line is not available to power any equipment : Hot plate

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Answer:

Explanation:

2H2O = H2 + O2

this ain't balanced because the value of hydrogen are not the same.

Answer:

3.125g/mol

Explanation:

To find the molar mass of the gas, we need to initially find the number of moles (n) contained in the gas. To find the number of moles, we use the general gas law whose equation is:

PV=nRT

Where; P= Pressure

V= Volume occupied by gas

n= number of moles

R= general gas constant

(0.0821 L atm mol/K)

T= absolute temperature

According to the question; P= 2.0atm, V= 2.0L, n= ?, T= 298K

To find n, we make it the subject of the formula:

n= PV/RT

n= 2.0 × 2.0 / 0.0821 × 298

n= 4/ 24.4658

n= 0.16mol

If number of moles (n) of the gas is 0.16mol and it weighs 0.500g, its molar mass can be found using:

number of moles (n) = mass (g) / molar mass

Making MM subject of the formula;

molar mass = mass / number of moles

MM= 0.500/0.16

MM= 3.125

Hence, the molar mass of the gas is 3.125g/mol.

Answer:

6. 350kg

7. 800kg

8.600 meters

Explanation: I don’t like Stealing point but this is what I think I should give you and I don’t know how your teacher learn you this...

Answer:

6 is 350kg

7 is 800kg

8 is 600 meters

Explanation:

Thanks btw

Answer:

5

Explanation:

Answer:

Explanation:

Start by writing water as HOH

Ca(OH)2 +CO2 = CaCO3+ HOH

Next pay attention to the CO2 going to CO3

We need an oxygen.

Fortunately that is provided by the (OH)2

Now we have

Ca(OH)2 + CO2 ==> CaCO3 + HOH

and believe it or not, that is balanced as it is

The left side has 1 Ca. So does the right side

The Left side has 1 C.  So does the right side.

The left side has 2 H. So does the right side

The left side has 2 oxygens (in Ca(OH2)) + 2 oxygens in CO2

So the equation is balanced.

The approximate resistance value at 45 degrees Celsius is around 5.8 ohms.

To calculate the value of the resistance temperature coefficient at 45 degrees Celsius using linear approximation, we can use the formula:

R(T) = R0 + α(T - T0),

where R(T) is the resistance at temperature T, R0 is the resistance at a reference temperature T0, α is the resistance temperature coefficient, and (T - T0) is the temperature difference.

Given that the resistance at 25 degrees Celsius is 5 ohms (R0 = 5) and the resistance at 50 degrees Celsius is 6 ohms (R(T) = 6), we can calculate the value of α.

6 = 5 + α(50 - 25),

Simplifying the equation:

1 = 25α,

Therefore, α = 1/25 = 0.04 ohm/degree Celsius.

Using the linear approximation, we can approximate the value of the resistance at 45 degrees Celsius:

R(45) = 5 + 0.04(45 - 25) = 5 + 0.04(20) = 5 + 0.8 = 5.8 ohms.

Therefore, the value of the resistance at 45 degrees Celsius is approximately 5.8 ohms.

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Answer: 1. The mole ratio between Zn and ZnCl2 is 1:1. Therefore, if 5.00 moles of Zn react, 5.00 moles of ZnCl2 would be produced.

2. The mole ratio between Zn and HCl is 1:2. Therefore, if 5.00 moles of Zn react, 10.0 moles of HCl would be reacted.

Answer:

5.00 moles of ZnCl2 are produced.

10.00 moles of HCl are reacted.

Explanation:

The balanced chemical equation tells us that 1 mole of Zn reacts with 2 moles of HCl to produce 1 mole of ZnCl2. Therefore, if 5.00 moles of Zn are completely reacted, the same amount of moles of ZnCl2 will be produced, which is also 5.00 moles.

According to the balanced chemical equation, 1 mole of Zn reacts with 2 moles of HCl. Therefore, to react 5.00 moles of Zn, we would need 2 moles of HCl for each mole of Zn. Since we have 5.00 moles of Zn, we would need 2 moles of HCl for each mole of Zn, which totals to 10.00 moles of HCl. So, 10.00 moles of HCl would be reacted.

Answer:

cation - electron loss hence positive charge

anion - electron gain hence negative charge

The given terms are correctly paired thus: anion is to electron gain while cation is to electron loss.

Ionic bond formation is defined as the formation of an ionic bond during a chemical reaction whereby an atom losses electrons while another gains electrons through transfer of these electrons.

For example in the formation of the compound NaCl. Sodium is the element that donates an electron from its outermost shell to chloride. Therefore, the sodium atom is the cation.

Also the chloride element would accept electron from the sodium, therefore, it is called the anion.

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The basic element of drawing that helps us illustrate the realistic view of an object is the "line."

Lines are essential as they define shapes, outlines, and edges of objects in drawings. The "alphabet of lines" refers to the different types of lines used in technical drawing, such as continuous, dashed, and dotted lines.

These lines help convey various details and aspects of the object being drawn.

In the "drawing" process, you use these lines to create a realistic representation of an object by capturing its dimensions, proportions, and perspective.

The "layout" is the arrangement of these lines and shapes on the drawing surface, ensuring a clear and organized presentation. To "generate" a drawing, you must effectively utilize these lines, the alphabet of lines, and the layout to create a visually accurate representation of the object you are depicting.

By incorporating these terms and concepts, you can create a detailed and realistic drawing that effectively communicates the appearance and characteristics of the object in question.

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A line spectrum is to an element as a fingerprint is to a person. Just as each element has a unique line spectrum, each person has a unique fingerprint.

In other words, a line spectrum is a characteristic pattern of lines that are produced when the light emitted by an element is passed through a prism or diffraction grating. This pattern is unique to each element and can be used to identify the element, much like a fingerprint can be used to identify a person.

So, to sum it up, the line spectrum is like the "fingerprint" of an element, allowing us to identify it based on its unique pattern of lines.

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