what is the melting point of a solution that is formed when 130 g of ethylene glycol (c2h6o2) is dissolved in 1.00 kg of water?

Answer:

Explanation:

1) Fe2O3 + 3 H2 -----> 2 Fe + 3 H2O Number of moles of Iron (III)oxide = 450 g / 159.69 g/mol = 2.82 mole

2) 0.0155 moles of hydrogen gas

3) oxide needed to produce 125 of oxygen is7.8 moles

4) 216.5894

5) K3PO4 and KNO3

The continuous annual decay rate of carbon-14 is k = ln (0.5)/5730.

The 1/2-life of a radioactive isotope is the quantity of time it takes for one-1/2 of the radioactive isotope to decay. The half of-existence of a selected radioactive isotope is consistent; it's miles unaffected by using situations and is independent of the initial quantity of that isotope.

1/2-life (symbol t1⁄2) is the time required for an amount (of substance) to reduce to half of its initial price. The time period is commonly utilized in nuclear physics to explain how speedy volatile atoms undergo radioactive decay or how long strong atoms survive.

Calculation:-

The functions as an exponential decay function as

P(t)=P₀e^{kt}

given the half-life as 5730 years, that is the time taken to reduce the mass to half

P₀/2 =P₀e^{5730k}

1/2=e^{5730k}

taking the natural log,

5730k=ln (0.5)

we get the exact continuous decay rate as

k = ln (0.5)/5730

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Empirical formula of the anhydrous salt is  CuSiF₆

The formula of the hydrate is CuSiF₆.6H₂O

The molecular formula of a compound is the simplest integer ratio of the atoms present in the compound. As a simple example of this concept, the empirical formula for sulfur monoxide (SO) is simply SO, as is the empirical formula for Di-sulfur dioxide S₂O₂

Consider mass of Cu = 30.9 g

mass of Si = 13.6 g

mass of F = 55.5 g

Now for empirical formula, let's calculate the moles of each element:

Moles of Cu = 30.9/63.5=.49 moles

Moles of Si = 13.6/28.0=.49 moles

Moles of F = 55.5/19=2.92 moles

As you can see the moles of Cu and Si are almost 6 times the moles of F, which result in the empirical formula of salt as;  CuSiF₆

Now, for the formula of  hydrate:

Moles of CuSiF₆ = 1/205.62

= 0 .00486 moles

weight of H₂O = 1.53-1

= 0.53 g

Moles of H₂O = .53/18

= 0.029 moles

CuSiF₆ : H₂O = 0.00486 : 0.029

= 0.029/0.00486

= 1:6

So the molecular formula of hydrate is CuSiF₆.6H₂O

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The given question is incomplete and the complete question is

Ammonia burns in the presence of a copper catalyst to form nitrogen gas. 4 NH3(g) + 3 O2(g) → 2 N2(g) + 6 H2O(g) ΔΗ = -1267 kJ What is the enthalpy change to burn 38.4 g of ammonia?​

Ammonia burns in the presence of a copper catalyst to form nitrogen gas. 4 NH3(g) + 3 O2(g) → 2 N2(g) + 6 H2O(g) ΔΗ = -1267 kJ and the enthalpy change to burn 38.4 g of ammonia is

Ammonia means NH₃ is one of the most commonly produced industrial chemical

Here given data is

ΔΗ = -1267 kJ

And the balanced reaction is

4 NH₃(g) + 3O₂(g) → 2N₂(g) + 6H₂O(g)

We have to calculate enthalpy change to burn g of ammonia = ?

First calculate the moles corresponding to 38.4 g NH₃

The molar mass of NH₃ is 17.03 g/mol

38.4 g ×1mole/17.03 g/mol = 2.25 mol

Then calculate the enthalpy change to burn 2.25 mol of ammonia

And according to the thermochemical equation 1267 kJ are released per 4 mole of ammonia that react

2.25 mol×(-1267kJ/4 mol) = -713 kJ

Enthalpy change to burn 38.4 g of ammonia is  -713 kJ

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A solution of 1.52 g of NH4SCN in 100 g of water in a calorimeter decreased in temperature by 3.1 °C when 3.15 g of Ba(OH)28H2O was added. Calculate the approximate amount of heat absorbed by the reaction using the following equation, assuming the specific heat of the solution and products is 4.20 J/g °C:

Ba(OH)2 + 8H2O + 2NH4SCN = 10H2O + Ba(SCN)2(aq), 2NH3(aq), and (l)

A material in one state is transferred into another substance in a different state through the process of absorption in chemistry (e.g., gases being absorbed by a liquid or liquids being absorbed by a solid).

The process of absorption is how the blood takes in the byproducts of digestion so that it can supply the rest of the body. The mucous membrane allows for the passage of the digested materials into the blood or lymph during absorption. The following mechanisms allow for absorption. basic diffusion

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1. The bacterial cell shown is a prokaryotic cell.

2a. The similarities between prokaryotic and eukaryotic cells include:

2b. The differences between prokaryotic and eukaryotic cells include:

Eukaryotic cells are cells that possess a membrane-bound nucleus as well as membrane-bound cell organelles.

Eukaryotic cells are cells of higher organisms such as animals and plants.

Prokaryotic cells are cells that lack a membrane-bound nucleus as well as membrane-bound cell organelles.

Prokaryotic cells are cells of lower organisms such as bacteria.

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The amount of carbon dioxide (CO2) released when burning fossil fuels is the primary factor in why fossil fuels are so destructive. The greenhouse effect and climate change are significantly impacted by the burning and release of CO2. Our planet warms because more CO2 in the atmosphere prevents sunlight from escaping back into space.

what are fossils?

A fossil is any preserved remnants, impression, or trace of any once-living organism from a previous geological epoch (from Classical Latin: fossilis, meaning "obtained by digging"). Bones, shells, exoskeletons, animal or microbe impressions in stone, items preserved in amber, hair, petrified wood, oil, coal, and DNA traces are a few examples.

The earth's natural mechanisms have controlled greenhouse gas output for millions of years. At a pretty constant rate, gases would be absorbed and released. Meanwhile, temperatures were kept at a level that allowed for the continuation of life on Earth. This is "a balancing act," according to the Environmental Protection Agency.As the Industrial Revolution got under way in the second part of the 1700s, humans began to alter the delicate balance. Since then, we have been continuously increasing the amount of greenhouse gases, particularly CO2, that are being injected into the atmosphere. These gases trap heat and cause global warming. Despite the fact that there are many greenhouse gases, some of which are more powerful than others, CO2 currently accounts for about 84 percent of all greenhouse gases produced by human activity, or about 30 billion tonnes annually.Although forestry and industrial operations also make significant contributions, the majority of this is caused by burning fossil fuels for transportation and power.

CO2 levels were at 270 parts per million before the Industrial Revolution (ppm). In 1960, CO2 concentrations were at 313 ppm.

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1. Combustion reaction

2. Single displacement reaction

3. Neutralization reaction

4. Synthesis reaction

5. Decomposition reaction

6. Synthesis reaction

There are different types of chemical reactions. The type of reaction that corresponds to each chemical equation as shown in the image respectively are:

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The mass of hydrogen that will be produced when 195 mg of potassium is added to water would be 5 mg.

From the balanced equation of the reaction:

[tex]2K + H_2O --- > 2KOH + H_2[/tex]

The mole number of the potassium that reacts to the mole of the hydrogen gas that is produced is 2:1.

If 195 mg of potassium reacts:

1 mg = 0.001 g

195 mg = 195 x 0.001

            = 0.195 g

Recall that: mole = mass/molar mass

Molar mass of potassium = 39 g/mol

mole of 0.195 g potassium = 0.195/39

                                             = 0.005 mol

From the stoichiometric mole ratio, the equivalent mole of hydrogen gas produced would be:

       0.005/2 = 0.0025 mol.

Molar mass of hydrogen gas = 2 g/mol

Mass of 0.0025 hydrogen gas = 0.0025 x 2

                                                   = 0.005 g

0.005 g = 0.005 x 1000

             = 5 mg

This means that 0.005 g or 5 mg of hydrogen gas will be produced when 195 mg of potassium is added to water.

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If the TLC plate are left in the chamber for too long after the solvent reached the top the  [tex]R_{f}[/tex] value achieved from experimentation will be different than the expected [tex]R_{f}[/tex] .

The value  [tex]R_{f}[/tex] is the ratio of the distance traveled by the solute to the distance traveled by the solvent. The term comes from chromatography when it was discovered that a particular component in a particular solvent always migrates the same distance under the same conditions.

In chromatography, the value of  [tex]R_{f}[/tex] is the basic requirement of the experiment. It indicates whether the analyte (solute) prefers the stationary or mobile phase. For stationary and mobile phases, the [tex]R_{f}[/tex]  value is used to determine polarity, relative mass, relative solubility, etc.

If the TLC plate is left in the development chamber for too long, solvent will flow to the top of the plate, causing unexpected migration of the chemicals coated on the silica plate. So the experimentally obtained value [tex]R_{f}[/tex] is different from the expected value

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The following best describes the difference between molar mass and formula weight is a formula weight is the mass of one molecule or formula unit while molar mass  is the mass of one mole of molecules or formula units.

A formula mass is the sum of all masses of atom present in empirical formula. molecular mass is the mass of one mole of molecule. formula weight base on empirical formula while molecular mass is depend on molecule.

Thus, The following best describes the difference between molar mass and formula weight is a formula weight is the mass of one molecule or formula unit while molar mass  is the mass of one mole of molecules or formula units.

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The covalent bonding allows atoms in group 16 of the periodic table to satisfy the octet rule is two share 2 electrons of another atom to complete 8 electrons.

According to octet rule , an atom loose , gain , or share electrons to complete their 8 valence electron and achieve stability. Covalent bond is formed when two electrons share their valence electrons to satisfy the octet rule. group 16 elements have 6 valence electrons and they need 2 electrons to complete their octet.

Thus, The covalent bonding allows atoms in group 16 of the periodic table to satisfy the octet rule is two share 2 electrons of another atom to complete 8 electrons.

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The mass of oxygen present in the emphysema patients' cylinder is 19.64grams.

The ideal gas equation is given by,

PV = nRT

P is the pressure, V is the volume, n is the moles of the gas, R is the gas constant and T is the temperature of the gas.

Mole scan be written as,

Moles = mass/molar mass

Molar mass of oxygen is 16 g/mol.

Here, the volume of the gas is 3 L and the pressure of the gas is 10atm. The temperature of the gas is 298 degrees Kelvin.

Putting the values,

3 x 10 = mass/16 x 0.082 x 298

Mass = 3 x 10/298 x 16/0.082

Mass = 19.64 grams.

The mass of oxygen in the cylinder is 19.64 grams.

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An electrolyte is a solution containing a large concentration of dissolved ions.

A solution containing a large concentration of dissolved ions is called an electrolyte. It mainly consists of dissolved cations ,anions. Some of the most important and commonly discussed electrolytes are

Calcium which plays a pivotal role in bone health in the body and muscle contraction and relaxation.

Sodium, which is responsible for maintaining osmolarity and nerve impulse conduction, the lack of sodium ions in the body may lead to Hyponatremia.

Potassium is another important electrolyte which is responsible for normal heart function and skeletal growth.

Chloride ions which are in close coordination with sodium ions in the body help in maintenance of the body's blood pressure. It can be obtained from tomatoes, olives, etc.

The shortage of these electrolytes in the body can cause physiological problems like tiredness, lethargy, sleeplessness and improper growth in case of children. Hence it is crucial for us to include all the electrolytes in our diet and have foods that are rich in water and electrolytes to stay healthy and fresh.

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Explanation:

permutit is an artificial zeolite chemically it is

hydrated sodium aluminum orthosilicate with the formula

Na2AI2Si208. XH20

When a force of 200 N is exerted on an object of mass 40kg, the acceleration is 05 m/s².

We know that, F = ma ... (i)

where F ⇒ Force

m ⇒ mass

a ⇒ acceleration

Given,

F = 200 N = 200 kg ms⁻²

m = 40 kg

By putting the values of F and m from the above question into equation (i), we get:

200 kg ms⁻² = 40 kg × a

a = 200 kg ms⁻² / 40kg

a = 5 ms⁻² or 5 m/s²

Hence, when a force of 200 N is exerted on an object of mass 40kg, the acceleration is 05 m/s².

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You can find the mass and volume of the pure metal then compare the density with the table of densities to determine which metal.

Density is a term used to describe how tightly a substance is packed. It fits that criteria of mass per unit volume. Formula for Density or Density Symbol: D The formula is: = m/V where is the object's mass, m is its density, and V is its volume. The term "mass" is used to describe how much matter there is in a thing. Mass is often represented in kilogrammes (kg) or grammes (g) (kg). The most common units of mass measurement are kilogrammes (kg) and grammes (g). No matter where in the cosmos it is or how much gravitational force is exerted on it, mass is a measure of how much matter there is.

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Answer:

The chemical symbol for Magnesium is Mg

Explanation:

As you can see on the periodic table Magnesium is in group two and has the element symbol of Mg

Hope this helps, have a great day!

Answer:

attached is the answer, hope it helps!!

While gdp was once a key cyclical indicator, its usefulness has declined substantially for all of following reasons except " Requires seasonal adjustments"

What is GDP?

It is the standard measure of value added created through the production of goods and services in a country during a certain period

The usefulness of GDP has declined except for following-

Requires seasonal adjustments

Because of seasonal adjustments, firms are able to predict the economic activity in the region and adjust their inventories,investments and production process accordingly.

Seasonal adjustment ensures that remaining movements in GDP, or any other economic series, better reflect true patterns in economic activity.

Thus the correct answer from above options is

" requires seasonal adjustments"

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note: complete question is

While GDP was once a key cyclical indicator, its usefulness has declined substantially for all of the following reasons except which one? Multiple Choice

If a balloon has a volume of 33000 L, the amount of hydrogen that would be needed to fill will be 29.46 kg.

At standard temperature and pressure, 1 mole of any gas is equivalent to 22.4 L of the gas.

The capacity of the balloon is 33000 L. The number of moles of hydrogen gas that will fill the balloon can be calculated using dimensional analysis as follows:

1 mole = 22.4 L

33000 L = 1 x 33000/22.4

               = 1473.21 moles

This means that 1473.21 moles of hydrogen will be required to fill the balloon.

Recall that: mole = mass/molar mass

Hence: mass = mole x molar mass

Molar mass of hydrogen gas = (1+1)

                                                = 2 g/mol

We can then use the above formula to calculate the mass of 1473.21 moles of hydrogen.

mass of 1473.21 moles hydrogen = 1473.21 x 2

                                                       = 2946.43 grams

2946.43 grams to kg = 2946.43/1000

                                   = 29.46 kg

In other words, if a balloon has a capacity of 33000 L, the amount of hydrogen that would be required to fill it will be  29.46 kg.

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When two compounds are combined and change into a third substance, this is referred to as a biochemical reaction (or chemical reaction). When two substances are combined, not all of them react chemically.

When one chemical material changes into one or more others, as when iron rusts, this is referred to as a chemical transformation. Chemical reactions produce changes in the way that molecules and atoms are ordered, which leads to the formation of new substances with new properties.

Examples for chemicals include the basic building blocks, such as zinc, nitrogen, and oxygen; combinations created from these building blocks, such as water, dioxide, or salt; and more complicated substances, such as the air you breathe, rainfall, a chicken, a car, etc.

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The molarity of the solution is  0.264 M.

Molarity is the quantity of a substance in a certain volume of solution. Molarity is defined as the moles of a solute in line with the liters of an answer. Molarity is likewise referred to as the molar attention of a solution.

calculation:-

mass = 21 g

the molar mass of potassium phosphate = 212 g

moles = mass/ molar mass

          = 21 / 212

           = 0.099  

Volume = 375 ml =0.375 L

molarity = number of moles/volume in liter

           =   0.099 /  0.375 L

            = 0.264 M

Molar concentration is the degree of the concentration of a chemical species, especially of a solute in a solution, in terms of the amount of substance in step with the unit quantity of the answer. In chemistry, the maximum generally used unit for molarity is the number of moles per liter, having the unit image mol/L or mol/dm³ in SI unit.

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Using the automatic pipette method, the density of the liquid is 0.82 g/ml.

Density, denoted by ρ, is the property of a substance which determines whether it will sink or float. It is the ratio between the mass of the substance and its volume. It can be calculated using the formula below.

ρ = m/v

where ρ = density

m = mass

v = volume

Given that a 100-μl automatic pipette was used, then the volume of the liquid is 100 μl.

1 µL = 0.001 mL

100 µL = 0.1 mL

Plug in the values and solve for the density of the liquid.

ρ = m/v

ρ = 0.082 g / 0.1 mL

ρ = 0.82 g/ml

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Answer:

Boiling stones should never be added to a hot liquid because that would cause the liquid to boil very fiercely. Now that the distillation is already in progress, first you have to cool down the solution.

Explanation:

When you have forgotten to add boiling stones to your round bottomed distillation flask, but now the distillation is in progress. You should not add boiling stones to the hot liquid, because that can cause that hot liquid to boil fiercely. So, you have to cool down that liquid first and then add boiling stones.

But if you do not add boiling stones in this process, it produces hot spots, which causes splashing out. So, you have to cool down the solution/reaction and then reheat the solution after adding boiling stones.

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The pH of an aqueous solution is -0.7459

Let the total volume of the solution where both the mixture of aqueous solution of sodium sulfide and sodium hydrogen sulfite are present be V

no. of moles of H+ coming from Na2S,H20 = 18 * 0.293 * V

no. of moles of H+ coming from NaHS = 0.236 * V

Final concentration of H+ will be

Cf = (18 * 0.293 * V) + (0,23 * V) / V

Cf = 5.57

pH = - log [5.57]

pH = - 0.7459

Negative pH occurs when the molarity of hydrogen ions in a strong acid is greater than 1N (normality)

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A large net force of 280N  is required to accelerate a 2000 kg suv from rest with an acceleration of 0.14m/s2 .

According to Newton’s 2nd law of motion,  force is  equal to the change in momentum per change in time.Acceleration of an object depends on the mass of the object and the amount of force applied.

            Force=mass* acceleration

Here, mass is equal to 2000 kg and acceleration is equals to 0.14m/s/s.putting these values,

      F= ma

     F= 2000kg * 0.14 m/s2

        = 280 kg m/s2

        =280N

So, 280N of force is required.

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