How many grams of NaOH is produced from 120 grams of Na₂O?

Answer:

True

Explanation:

Answer:

thermal equilibrium

Explanation:

When they are at the same temperature, we say that they are in thermal equilibrium , and there is no overall transfer of energy any more between the two objects.

Formaldehyde is used industrially to make polymers, insulating materials and carpeting. So the correct option is (d) all of these .

Carbon, hydrogen, and oxygen make up the compound known as formaldehyde. Every biological system, including humans, animals, and plants, contains it naturally. A pungent, colourless gas called formaldehyde is a component of numerous household goods and building materials.

Formaldehyde is used in glues and adhesives, permanent-press fabrics, paper product coatings, pressed-wood products like particleboard, plywood, and fiberboard, as well as glues and insulation materials.

Therefore, Formaldehyde is used industrially to make polymers, insulating materials and carpeting. So the correct option is (d) all of these.

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Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

\(volume = \frac{mass}{density} \\\)

From the question

mass = 12.5 g

density = 7.87 g/cm³

We have

\(volume = \frac{12.5}{7.87} \\ = 1.588310038...\)

We have the final answer as

Hope this helps you

1.732 x 10⁻⁴ M is the concentration of silver ions be in a saturated silver chromate solution solubility product if solid sodium chromate.

The equilibrium reaction for the dissolution of silver chromate is:

Ag₂CrO₄(s) ⇌ 2 Ag+(aq) + CrO₄²⁻(aq)

The solubility product constant (Ksp) expression for this equilibrium is:

Ksp = [Ag+]² [CrO₄²⁻]

In a saturated solution of silver chromate, the concentration of silver ions is given as 8.66 x 10⁻⁵ M.

When solid sodium chromate is added, it dissociates into sodium ions and chromate ions:

Na₂CrO₄(s) → 2 Na+(aq) + CrO₄²⁻(aq)

The concentration of chromate ions in the solution is given as 0.0600 M.

Since the stoichiometry of the equilibrium reaction is 2:1 for silver ions to chromate ions, the concentration of silver ions will double solubility product. Therefore, the new concentration of silver ions in the saturated solution will be:

[Ag+] = 2 x (8.66 x 10⁻⁵ M) = 1.732 x 10⁻⁴ M

After adding solid sodium chromate, the concentration of silver ions in the saturated silver chromate solution will be 1.732 x 10⁻⁴ M.

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The ability of microbes to utilize N2 as a nitrogen source is called Nitrogen fixation.

Nitrogen fixation refers to the process by which certain microorganisms convert inert atmospheric nitrogen (N2) into biologically useful forms of nitrogen. Nitrogen is a crucial component of amino acids, which are building blocks of proteins and nucleic acids (DNA and RNA) essential for life.Nitrogen fixation is classified into two categories: atmospheric and industrial. Nitrogen fixation by industrial processes includes Haber-Bosch and Ostwald processes while biological nitrogen fixation is a natural process. Biological nitrogen fixation is carried out by some free-living soil bacteria, symbiotic bacteria present in the root nodules of leguminous plants, and some other groups of bacteria that live in symbiotic associations with various types of plants.

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Combustion analysis of fluorene, a polycyclic aromatic hydrocarbon used to make dyes, plastics, and pesticides, produces 11.44 g CO2 and 1.80 g H2O. The empirical formula of fluorene C₆H₄.

CₓHₐ + O2 → CO2 + H2O Since the combustion is complete, so the total mass of the reactants is equal to the total mass of the reactants Therefore, Mass of O2 = (17.9 + 9.14) – 5.9 = 21.14 grams Here, the empirical formula for the hydrocarbon is CₓHₐ. So, now we have to need to determine the number of moles of the O2, CO2, and H2O :- Mole of CO2 = 17.9/44 = 0.4068 Mole of H2O = 9.14/18 = 0.5078 Mole of O2 = 21.14/32 = 0.6606. The empirical formula for the compound containing uranium and fluorine is UF6. Explanation: The empirical formula of a compound represents the lowest whole number ratio of elements in the compound. This ratio is represented by subscripts in the formula. by this information, we can consider that combustion analysis of fluorene, a polycyclic aromatic hydrocarbon used to make dyes, plastics, and pesticides, produces 11.44 g CO2 and 1.80 g H2O. The empirical formula of fluorene C₆H₄.

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Answer:

They have mobile charged particles.

Explanation:

Plasma refers to very hot matter such that the electrons in matter are ripped away from the atoms leading to the formation of an ionized gas.

We know that the carriers of electricity are charged particles. Any state of matter that has an abundance of charge carriers will definitely be a good conductor of electricity.

Therefore, plasmas are good conductors of electricity because they have a lot of mobile charged particles.

The solubility product constant for CaCO3 can be expressed as Ksp = constant * [CaCO3]2, where [CaCO3] is the concentration of the undissociated CaCO3 in the solution.

The expression for Ksp for the dissolution of CaCO3 is as follows: Ksp = [Ca2+][CO32-]

Where,Ksp is the solubility product constant.[Ca2+] is the concentration of Ca2+ ions.[CO32-] is the concentration of CO32- ions.CaCO3 is a sparingly soluble salt, and its solubility equilibrium reaction is given below.

CaCO3(s) ⇌ Ca2+(aq) + CO32-(aq)

Since it is a sparingly soluble salt, we can assume that it dissociates very little in solution. This implies that [Ca2+] and [CO32-] would be negligible compared to the concentration of CaCO3 that has not dissociated.

Thus, the expression for Ksp becomes: Ksp = [Ca2+][CO32-] ≈ [CaCO3]2 where [CaCO3] is the concentration of the undissociated CaCO3 in the solution.

Since the concentration of CaCO3 is very low, it can be considered as a constant, and the Ksp expression becomes: Ksp = constant * [CaCO3]2

Therefore, the solubility product constant for CaCO3 can be expressed as Ksp = constant * [CaCO3]2, where [CaCO3] is the concentration of the undissociated CaCO3 in the solution.

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Answer:

The chemical elements most likely to form covalent bonds are those that share electrons, such as carbon, as opposed to those that take them from another element to form an ionic bond. In general, they are nonmetals with similar electronegativities.

Explanation:

Answer:a

Explanation:

None of the elements have the same electron arrangement as neon.

Neon (Ne) has a stable electron arrangement with a full outer shell of electrons. It belongs to the noble gas group, which means its outermost energy level (valence shell) contains a total of 8 electrons, making it chemically inert. This arrangement is known as a "closed shell" or "octet configuration." No other element in the periodic table has the exact electron arrangement as neon, as each element has a unique number of electrons and different electronic configurations.

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This question is providing the masses of carbon dioxide and oxygen gases at 10.0 atm as 66 g and 16 g respectively, and is asking for the partial pressure of the former which turns out to be 7.50 atm after doing the math.

Thus, we can start solving this problem with the Dalton's law approach, in order to make a relationship for the total pressure, partial pressure and mole fraction, which means we must first determine the mole fraction of carbon dioxide gas in the mixture as shown below:

\(x_{CO_2}=\frac{n_{CO_2}}{n_{CO_2}+n_{O_2}}\)

Next, we calculate the moles of both gases by dividing the grams over the molar masses:

\(n_{CO_2}=\frac{66g}{44.01g/mol} =1.50mol\\\\n_{O_2}=\frac{16g}{32g/mol} =0.5mol\)

Then, the mole fraction of carbon dioxide as the required one by plugging in the previously calculated moles:

\(x_{CO_2}=\frac{1.5}{1.5+0.5}=0.75\)

Finally, we use the definition of the Dalton's law to calculate the partial pressure of carbon dioxide gas in the binary mixture:

\(P_{CO_2}=x_{CO_2}P\\\\P_{CO_2}=0.75*10.0atm\\\\P_{CO_2}=7.50 atm\)

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Answer:Atomic radius gets bigger

Explanation:

Atomic radius bigger because not only do the atoms have more and more protons and neutrons, and thus more mass in general, there is also stronger shielding affect. Shielding affect is when electrons closer to the nucleus block the positive charge from reaching electrons farther from the nucleus, and thus those far electrons are not drawn towards the nucleus as strongly, and spread out more, increasing atomic radius.

Out of the given options, none of the following have the empirical formula CHO.

The empirical formula is the simplest formula for a compound that reflects the ratio of elements present in the compound. It gives the ratio of atoms of different elements in the compound. The empirical formula can be different from the molecular formula.

Lipids are the biomolecules that are composed of carbon, hydrogen, and oxygen (CHO) in a different ratio. They are the esters of fatty acids and glycerol. They are also known as fats or oils. They are the major component of cell membranes. Lipids include fats, phospholipids, and steroids.

Nucleic acids are macromolecules composed of nucleotide units. Nucleotide units consist of a nitrogenous base, a sugar, and a phosphate group. They are the building blocks of DNA and RNA. The empirical formula of nucleic acids is C5H4O2N3P. They contain nitrogen, phosphorus, carbon, oxygen, and hydrogen. They do not have the empirical formula CHO.

Proteins are macromolecules composed of amino acids. They have a complex structure. Proteins are composed of carbon, hydrogen, oxygen, and nitrogen. Some proteins also contain sulfur and phosphorus. Therefore, they do not have the empirical formula CHO. Thus, out of the given options, none of the following have the empirical formula CHO.

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Answer:

7.10 moles of iron

Explanation:

Given data:

Number of moles of iron = ?

Number of atoms of iron = 4.82×10²⁴

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ atoms

4.82×10²⁴ atoms × 1 mol / 6.022 × 10²³ atoms

0.710×10¹

7.10 moles of iron

Answer:

c

the cycling of water in and out of the atmosphere

Answer:A, C, D

Explanation:

Answer

-52.2 Joules

Explanation

Given that;

Mass of krypton, m = 12.3 g

Temperature change, ΔT = 22.2°C - 39.3°C = -17.1°C

The specific heat of gaseous krypton, c = 0.248 J/g°C.

What to find:

The energy change, Q.

Step-by-step solution:

The energy change, Q can be determined using:

Q = mcΔT

Putting the values of the given parameters into the formula, this yields:

Therefore the energy change = -52.2 Joules

As per the details given, 4.0 moles of water would have a mass of approximately 72.06 grams.

We must take the molar mass of water into account in order to calculate the mass of 4.0 moles of \(H_2O\) (water).

The atomic masses of two hydrogen atoms (1.008 g/mol each) and one oxygen atom (16.00 g/mol) are added to provide the molar mass of water, which is around 18.015 gram per mole (g/mol).

Using the equation:

Mass = Moles × Molar Mass

We can calculate the mass of 4.0 moles of water:

Mass = 4.0 moles × 18.015 g/mol

Mass = 72.06 grams

Therefore, 4.0 moles of water would have a mass of approximately 72.06 grams.

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The correct answer is the amount of sodium chloride needed to make this eye solution isotonic with tears is approximately 1.85 grams. Rounding it up to the nearest whole number gives us the answer as 2. Hence, the correct option is 22.

The given solution is a hypotonic solution as the solution's tonicity is lower than that of the tears. The tears contain 0.9% w/v of NaCl, which is isotonic with tears. So, to make the given solution isotonic, the amount of sodium chloride needs to be added.

The concentration of NaCl in tears is 0.9% w/v. Additional Information: We know that % w/v is the amount of solute present in grams per 100 ml of the solution. Therefore, 0.9% w/v means 0.9 grams of NaCl is present in 100 mL of tears.

To make 30 ml of isotonic solution, we can use the following formula: Equivalent weight of NaCl = 58.5/2 = 29.25 (as NaCl ionizes to give Na+ and Cl- ions)Moles of NaCl required to make 30 ml isotonic solution = 0.9 × 30 / 1000 = 0.027Moles of Na+ and Cl- ions present in 30 mL of isotonic solution = 2 × 0.027 = 0.054

A number of grams of NaCl needed to prepare 30 mL of isotonic solution is calculated as follows:0.054 g = (0.027 x 29.25 x X) / 1000Where X is the amount of NaCl required to make 30 mL isotonic solution. Solving this equation gives us: X = 1.85 g (approx). Therefore, the amount of sodium chloride needed to make this eye solution isotonic with tears is approximately 1.85 grams. Rounding it up to the nearest whole number gives us the answer as 2. Hence, the correct option is 22.

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Adding nickel catalyst will have a positive effect on the reaction rate of the reaction.

A catalyst can increase the rate of reaction by providing an alternative reaction pathway that has a lower activation energy. In this case, adding nickel catalyst can increase the reaction rate of the reaction.

Nickel is a good catalyst because it is able to adsorb reactant molecules onto its surface and hold them there while the reaction takes place. This reduces the activation energy of the reaction, making it easier for the reaction to occur.

On the energy diagram of the reaction, adding nickel catalyst lowers the activation energy of the reaction. This means that the reactants require less energy to get over the energy barrier and react.

This increases the reaction rate of the reaction. This means that the reaction rate is increased as a result of the lower activation energy.

Therefore, adding nickel catalyst will have a positive effect on the reaction rate of the reaction.

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The balance and net ionic equation are;

1. Ca (s) + Br2 (l) → CaBr2 (s)

2. HNO3 (aq) + BaCl2 (aq) → Ba(NO3)2 (aq) + 2HCl (aq)

3. C7H16 (l) + 11O2 (g) → 7CO2 (g) + 8H2O (l)

4. balanced equation:Cl2 (g) + 2KI (aq) → 2KCl (aq) + I2 (s),

Net ionic equation:

Cl2 (g) + 2I- (aq) → 2Cl- (aq) + I2 (s)

5. Zn (s) + Ca(NO3)2 (aq) → No reaction (since Ca is less reactive than Zn)

6. 2Na3PO4 (aq) + 3Mg(NO3)2 (aq) → Mg3(PO4)2 (s) + 6NaNO3 (aq)

Net ionic equation: 2PO4^3- (aq) + 3Mg^2+ (aq) → Mg3(PO4)2 (s)

7. 2Al (s) + 3ZnCl2 (aq) → 2AlCl3 (aq) + 3Zn (s)

8. 2Fe2O3 (s) → 4Fe (s) + 3O2 (g)

9. Balanced equation: LiOH (aq) + HCl (aq) → LiCl (aq) + H2O (l)

Net ionic equation: OH- (aq) + H+ (aq) → H2O (l)

10A. Solid sodium in water.

2Na (s) + 2H2O (l) → 2NaOH (aq) + H2 (g)

10B. What would happen if you bring a burning splint to the previous reaction?

10 C - The burning splint would go out (since the H2 produced in the reaction may ignite and cause a "pop" sound, but the burning splint itself would go out).

A balanced equation is a chemical equation with equal numbers of atoms for each element on both sides, following the law of conservation of mass.

A net ionic equation is a simplified version of a balanced equation that only shows species participating in the reaction as ions, excluding spectator ions that remain unchanged throughout the reaction. This highlights the actual chemical changes occurring in the reaction.

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Answer:

1 mole of lithium is 7 grams. we know this from it's relative molecular mass.

if 1 mole is 7 grams then x moles is 0.56 grams

we can equate them by saying (1/x)=(7/0.56)

after cross multiplying, we get 7x=0.56, x will be equals to 0.56/7

x=0.08 grams

0.08 mole is your answer

Answer:

we have

1 mole of li =7g

now

5.6×10^-1g of li =1mole/7g×5.6×10^-1 g=0.08mole

Answer:

it adds up to 25000 grams

Answer: B

Explanation: molarity = concentration c= n/V = 0.5 mol/ 0.05 l = 10 mol/l

The molarity of  a solution is the number of moles of its solute divided by volume in liters. The molarity of the 50 ml solution containing 0.5 moles of potassium fluoride is 10 M or 10 molar.

Molarity is a common term used to express the concentration of a solution. It is the ratio of number of moles of solute particles to the volume of solution in liters. Hence, its unit is mol/L or molar.

The molarity of a solution is a colligative quantity as well as temperature dependent.

Given,

no.of moles of potassium fluoride salt in water = 0.5 moles.

volume of solution = 50 ml

1 L = 1000 ml

then 50 ml = 0.05 L.

Molarity = no.of moles of solute/ volume of solution in L

M = 0.5 moles/ 0.05 L

   = 10 M.

Therefore, the molarity of the given solution is 10 molar.

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Answer:

The answer is

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

\(volume = \frac{mass}{density} \)

From the question

mass of CCl4 = 40g

Density = 1.6 g/mL

The volume is

\(volume = \frac{40}{1.6} \)

We have the final answer as

Hope this helps you

Heating lime with aluminum. is the source for commercial production of calcium.

As an alloying agent, calcium is also employed in the synthesis of several metals. In addition to being utilized in the glass industry, calcium carbonate is used to manufacture cement and mortar. Additionally, toothpaste and mineral supplements include calcium carbonate. Acetylene gas and polymers are both made with calcium carbide.

Pure calcium metal is currently manufactured commercially by heating lime with aluminum, as opposed to the previous method of electrolysis of anhydrous calcium chloride. The metal slowly reacts with airborne nitrogen, oxygen, and water vapor to produce a yellow oxide, hydroxide, and nitride coating.

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The four forces of flight include the following: lift, thrust, drag, and weight.

A force is defined as an external action on an object that causes it to move from one place to another.

For a airplane to be suspended on air, the four forces that must act on it includes the following:

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Best describes the forces in the nucleus of a stable atom is the strong nuclear force balances out the electrostatic force.

The center region of an atom, which is composed of two different types of particles, is known as the atomic nucleus. Protons with positive charges and neutrons with no charges are present. Because of the strong electrostatic attraction between positively charged protons, atomic nuclei should be unstable, however they occasionally remain stable for more than a billion years.

The stability of nuclei suggests that protons and neutrons are attracted to one another by an attractive force. The strong nuclear force, also known as the residual strong force, is responsible for every individual atomic nucleus' stability. Neutrons and protons are held together by this basic force of nature. It is used to explain the atom's and its nucleus' stability, which is otherwise puzzling. It can be used to explain the origin of all atoms and, consequently, the origin of all known simple and complex molecules.

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Answer:

d ≈ 0.47

Explanation:

Density is represented by the ratio of mass to volume. We are given the mass (7 grams), but we need the volume.

The volume can be calculated by subtracting the new volume from the old volume.

25 mL - 10 mL = 15 mL

The volume is 15 mL and the mass is 7 grams. Now, set up the ratio. Remember, d = m/v.

d = 7/15

d ≈ 0.47