According to the law of conservation of mass, the total mass of the products of a chemical reaction should equal the total mass of the reactants. In our reaction on a balance, however, the mass went down, from 253. 0 g to 250. 2 grams. Using the given chemical equation, explain what caused the apparent loss of mass

in the lewis resonance structure for ammonium ion (nh4 ) in which the central n atom is singly bonded to each of the four h atoms on the n atom positive charge is present.

Ammonia is a colorless, intensely unpleasant gas with a pungent, choke-inducing smell. It readily dissolves in water to produce an ammonium hydroxide solution that can irritate the skin and burn. Ammonia gas is easily compressed and, when put under pressure, turns into a clear, colorless liquid.

The ammonia has normally three hydrogen attached to central nitrogen atom carrying lone pair. When fourth hydrogen attaches to the central atom positive charge appear on the central atom.

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The correct option is ,H2 + 2OH- → 2H2O .

Electrons are the lowest of the elements that constitute a molecule, and thus hold a negative charge. In a neutral atom, there are an equal number of ions and neutrons. One proton and one hydrogen are all that the hydrogen atom has. From the other hand, the uranium atom possesses 92 protons, which means 92 electrons.

Briefing :

Now we have introduced more hydrogen, so we need to balance hydrogen on the left side in acidic solution, we get

\(2H^{+} +H_{2} O_{2}\) → \(2H_{2} O\)

Now all the atoms are balanced but charge is not balanced. We see that the left side there are two positive charge. So, we balance the charge by adding two negative charge on the left side in the reaction, we get

\(2e^{-} +2H^{+} +H_{2} O_{2}\) → \(2H_{2} O\)

Therefore, the correct option is,

\(2e^{-} +2H^{+} +H_{2} O_{2}\) → \(2H_{2} O\)

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Answer:

small i think

Explanation:

Salts such as \( Na_{2} SO_{4}\) are used in softening of hard water.

Hardness of water is the presence on water of dissolved metallic ions such as calcium and magnesium ions results in the water having additional properties such as taste.

Hardness of water is of significance in the laundry industry as it causes water to lather with difficulty and also produces sc_um.

To remove hardness of water or to soften water, salts such as \( Na_{2} SO_{4}\) are used.

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The molar mass of the compound: CuCl₂·2H₂O = (1 × 63.55) + (2 × 35.45) + (2 × 2 × 1.01) + (2 × 16.00) CuCl₂·2H₂O = 63.55 + 70.90 + 4.04 + 32.00 CuCl₂·2H₂O = 170.49 g/mol So, the molar mass of the compound CuCl₂·2H₂O is approximately 170.48 g/mol (as per the given options).

To determine the molar mass of CuCl₂ 2H₂O, we need to calculate the total mass of all the molecules present in one mole of the compound. The molecular weight of CuCl₂ is 134.45 g/mol (63.55 g/mol for Cu and 70.90 g/mol for Cl₂). Since there are two water molecules in the compound, we need to add their molecular weight as well, which is 2(18.015 g/mol) = 36.03 g/mol. Therefore, the molar mass of CuCl₂ 2H₂O is:

molar mass = 134.45 g/mol + 36.03 g/mol = 170.48 g/mol

Thus, option D is the correct answer.

In summary, to calculate the molar mass of a compound, we need to add up the masses of all the molecules present in one mole of the compound, which is expressed in grams per mole. Knowing the molar mass of a compound is useful for many purposes, including determining the amount of a substance needed for a chemical reaction, calculating the concentration of a solution, and converting between the mass and moles of a substance.

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For a real gas to approach the properties of an ideal gas, the pressure should be low, the attraction between the molecules should be high, and temperature should be high.

Ideal gas conditions are:

         PV =nRT

The real gas conditions are:

       (P +αn²) (V - nb) = nRT

             V²

Thus, real gases behave ideally at high temperatures and low pressures.

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Estimated H-Cl bond energy: Approximately 431 kJ/mol

The H-Cl bond energy can be estimated by subtracting the sum of the bond energies of the constituent atoms from the bond energy of the HCl molecule. The bond energy values for H-H, Cl-Cl, and H-Cl bonds are required for this calculation.

The H-H bond energy is around 436 kJ/mol, while the Cl-Cl bond energy is approximately 242 kJ/mol. Subtracting these values from the known bond energy of HCl, which is approximately 299 kJ/mol, gives us an estimate of the H-Cl bond energy.

H-Cl bond energy ≈ HCl bond energy - H-H bond energy - Cl-Cl bond energy

≈ 299 kJ/mol - 436 kJ/mol - 242 kJ/mol

≈ -379 kJ/mol

The negative value suggests that this estimate is not accurate. However, this discrepancy arises because bond energies are typically defined as the amount of energy required to break a bond, rather than the energy released when forming a bond. By reversing the sign, we obtain a positive value for the estimated H-Cl bond energy, which is approximately 431 kJ/mol.

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Answer:

balance

Explanation:

Answer:

no, it is fastest when many bubbles are produced.

Explanation:

The statement is FALSE. Non-ferrous metals can be hardened by heat treatment, although the mechanisms and processes involved may differ from ferrous metals.

Heat treatment techniques such as precipitation hardening can be used to increase the strength of non-ferrous metals. Non-ferrous metals are metals or alloys that do not include iron (or iron allotropes, such as ferrite, etc.) in significant quantities. Non-ferrous metals are employed because they have desired qualities like reduced weight (for example, aluminium), greater conductivity (for example, copper), non-magnetic characteristics, or corrosion resistance (for example, zinc), even though they are often more expensive than ferrous metals. In the iron and steel sectors, several non-ferrous materials are also employed. Bauxite, for instance, is used as a flux in blast furnaces, whereas wolframite, pyrolusite, and chromite are utilised to create ferrous alloys.

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Answer:

4.7 Liters of NO2

Explanation:

mole weight of HNO3  (from periodic table) = ~~ 63 gm/mole

  12 grams of this is   12/63 = .19047 mole

From the equation, you should be able to see that 3 moles of NO2 produces 2 moles of HNO3

  so you need  3/2 * moles HNO3 = .2857 moles of NO2 needed

PV = nR T     n = moles   R = .082057 L-atm/(k-mole)    25 C = 298.15 K

1.6 (V) = .2857 (.082057)(298.15)

  solve for V = 4.37 liters of NO2

You can fill in the table for other elements and their respective isotopes by determining the appropriate number of protons, neutrons, and electrons based on the given isotope mass number and atomic number.

To accurately fill in the table with the correct number of subatomic particles for the elements given the isotope mass number, we need to consider the composition of atoms and their respective subatomic particles. Atoms are composed of protons, neutrons, and electrons.

The number of protons in an atom is equivalent to its atomic number, which uniquely identifies the element. The number of neutrons can be determined by subtracting the atomic number from the isotope mass number. Electrons in a neutral atom are equal to the number of protons.

Let's take an example using the isotope mass number:

Isotope: Carbon-14 (mass number = 14)

Element: Carbon (atomic number = 6)Based on the atomic number and isotope mass number, we can determine the number of subatomic particles as follows:

Protons: 6 (same as the atomic number)

Neutrons: 14 - 6 = 8

Electrons: 6 (same as the number of protons in a neutral atom)

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To determine the amount of water and methane needed, we can set up a system of equations based on the desired composition of the mixture. you should use 36 gallons of water and 54 gallons of methane to obtain a mixture of 90 gallons with a methane concentration of 60%.

Let's assume x represents the number of gallons of water and y represents the number of gallons of methane. We have the following information: The total volume of the mixture is 90 gallons: x + y = 90. The mixture should be 60% methane: (y / (x + y)) * 100 = 60. Simplifying the second equation: y / (x + y) = 0.6. Now we can solve the system of equations: From equation 1, we can express x in terms of y: x = 90 - y. Substituting this into equation 2: y / ((90 - y) + y) = 0.6. Simplifying further: y / 90 = 0.6. Solving for y: y = 0.6 * 90. y = 54. Now we can find x using equation 1: x = 90 - y. x = 90 - 54. x = 36. Therefore, you should use 36 gallons of water and 54 gallons of methane to obtain a mixture of 90 gallons with a methane concentration of 60%.

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The most stable isotope among the the isotopic substance given from above is Plutonium-238.

The correct answer choice is option d.

Isotopy is the existence of a chemical element which result to having the same atomic number but different mass number.

From the given task above, the only isotope which is most stable is the Plutonium-238. This is because this isotope has a half life of alot of years; specifically; about 82,000,000 years.

Another interesting thing of factor which makes Plutonium-238 the most state from above is that Plutonium-238 itself decays into uranium-240 through alpha radiation.

There are three different types of radiation in science, these are as follows:

In conclusion, we can now deduced from the above solution that Plutonium-238 is the most stable isotope from above.

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Small molecules make up water. There are three of them: two hydrogen atoms and one oxygen atom. Hydrogen bonding is a force that holds water molecules together. It is the cause of water's extraordinary abilities.

Our bodies require water for the following reasons:

1. It soothes joints:  In the spine's disks and in joints, cartilage contains about 80% water. Over time, dehydration can reduce the joints' ability to absorb damage, which can result in joint pain.

2.It produces mucous and saliva: Saliva helps in digestion and keeps the eyes, nose, and lips moist. Wear and tear are prevented in this way. Furthermore, drinking water maintains the mouth healthy. When substituted for sweetened beverages, it can also stop tooth decay.

3. It delivers oxygen throughout the body: Blood transports oxygen to various parts of the body and contains more than 90% water.

4. It protects delicate areas of the spinal cord and brain with padding: Brain anatomy and function can be impacted by dehydration. Additionally, it contributes to the synthesis of neurotransmitters and hormones. Long-term dehydration can cause issues with reasoning and thinking.

5. It controls the body's temperature: Perspiration is the result of the middle-layers of the skin's stored water being released when the body becomes hot. Evaporation causes the body to cool. in a sport. Some scientists claim that: Source of reality When the body doesn't have enough water, it can't handle heat stress as well, and it stores more heat. Lots of water consumption may help to reduce physical stress if heat stress occurs when exercising. Yet additional research is needed to fully understand these effects.

6. Water is necessary for the digestive system: The bowel need water to operate properly. Dehydration can lead to constipation, excessive stomach acid, and digestive problems. The likelihood of stomach ulcers and heartburn has increased as a result.

7. It keeps blood pressure stable: Lack of water can cause blood to become thicker. Enough water may reduce the likelihood of vasopressin release, which reduces the risk of high blood pressure, by keeping our cells and organs hydrated.

8. Water prevents kidney damage: The kidneys are in charge of body fluid. Water deficiency may result in kidney stones and other problems. Water is required by the bowel for proper operation. Dehydration can cause digestive problems such as constipation, excessive stomach acid, and more. As a result, it is now more probable to have heartburn and stomach ulcers.

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Sun-Bleached hair.

You can't exactly pass down piano skills, they have to be taught and also you can't just be born with strong muscles, they also have to develop over time. Height can't exactly be passed down because some parents are tall and their kids come out short. That leaves the only other option to be Sun-Bleached Hair (hair color).

Hope this helps and have a nice day.

-R3TR0 Z3R0

Answer: 190 g of magnesium chloride can be produced by reacting 2 moles of chlorine gas with excess magnesium bromide.

Explanation:

The balanced chemical reaction is;

\(Cl_2+MgBr_2\rightarrow MgCl_2+Br_2\)

\(Cl_2\) is the limiting reagent as it limits the formation of product and \(MgBr_2\) is the excess reagent.

According to stoichiometry :

1 mole of \(Cl_2\) produces = 1 mole of \(MgCl_2\)

Thus 2 moles of \(Cl_2\) will produce=\(\frac{1}{1}\times 2=2moles\)  of \(MgCl_2\)

 Mass of \(MgCl_2=moles\times {\text {Molar mass}}=2moles\times 95g/mol=190g\)

Thus 190 g of magnesium chloride can be produced by reacting 2 moles of chlorine gas with excess magnesium bromide

Answer:

step 2

hope this helps!

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Answer:

15 because it is the closest

Explanation:

Answer: Volume is 22,3 ml

Explanation:  I assume solubility is expressed to 100 ml water

You can use proportion :  179 g / 100 ml water =  40 gm/ V

Multiplying the proportion gives 179 g  · V = 100 ml · 40 g | : 179 g

V = 4000  ml / 179 = 22,3 ml

0.0525 moles of HNO\(_3\) are present in the acid solution if 0.105 mol of Ba(OH)\(_2\) was needed to neutralize the acid solution.

A chemical reaction known as neutralization occurs when an acid and a base quantitatively react with one another. Alternate spellings include Neutralization. The pH of the neutralized solution is determined by the acidity of the reactant.

The balanced chemical equation for the reaction between HNO\(_3\) and Ba(OH)\(_2\):

2 HNO\(_3\) + Ba(OH)\(_2\) → Ba(NO\(_3\))\(_2\) + 2 H\(_2\)O

From this equation, we can see that two moles of HNO\(_3\) react with one mole of Ba(OH)\(_2\). Therefore, if 0.105 mol of Ba(OH)\(_2\) was needed to neutralize the acid solution, then the number of moles of HNO\(_3\) present is half of that:
Number of moles of HNO\(_3\) = 0.105 mol / 2 = 0.0525 mol
So, there are 0.0525 moles of HNO\(_3\) present in the acid solution.

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Answer:

Explanation:

Exothermic Reactions

Exothermic Reactions

This means that the energy required to break the bonds in the reactants is less than the energy released when new bonds form in the products. Excess energy from the reaction is released as heat and light. Figure: Chemical reaction: A Hermite reaction, which produces molten iron.

Answer:

Explanation:

vacuole -used to storage

5 g of span 80 and 15 g of tween 60 should be used in formulating 500 g of this cream.

1. To calculate the HLB of the oil phase, we need to determine the HLB contribution of each ingredient. Stearyl alcohol and cetyl alcohol both have an HLB of 15, so their combined contribution is 9 (8% + 1%). Lanolin anhydrous has an HLB of 10, so its contribution is 1. Therefore, the total HLB of the oil phase is 10.

2. To calculate the amount of span 80 and tween 60 needed, we need to use the HLB values to determine the required HLB of the emulsifier system. The oil phase has an HLB of 10, so we need an emulsifier system with an HLB between 10-12. To achieve this, we can use a combination of span 80 and tween 60 in a ratio of 1:3.

First, we calculate the total weight of the emulsifier system needed: 500 g x 4% = 20 g

Next, we calculate the weight of span 80 needed: 20 g x 1/4 = 5 g

Finally, we calculate the weight of tween 60 needed: 20 g - 5 g = 15 g

Therefore, 5 g of span 80 and 15 g of tween 60 should be used in formulating 500 g of this cream.

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For this question, since we are given the pressure, number of moles and temperature to find the volume, we have to use the ideal gas equation.

pV = nRT

Now lets put in the values

V = (0.263 mol x 8.314 J/mol x 307 k)/1.15 atm

V = 583.722 L

.

Answer:

The answer would probably be C. The clock can be seen and heard.

The  speed of the fallen tree from the hill in km/hr would be 46.4 km/hr.

simple unit conversion is applied here so, The problem here is about converting the speed of an object from one unit to another. Specifically, we are to convert from m/s to km/hr.

Speed is the function of distance and time. Thus, the distance needs to be converted to km from m and the time to hr from s.

13 m/s is equivalent to 13 m distance and 1 second time.

remember that:

1000 m = 1 km

13 m = 13/1000

 = 0.013 km

3600 seconds = 1 hr

1 second = 1/3600

  = 0.00028 hour

The speed of the fallen tree in km/hr will be then:

0.013/ 0.00028  = 46.4 km/hr

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The approximate speed of the satellite, expressed to the correct number of significant figures, is approximately 7.6 km/s.

The correct answer is B. 7.6 km/s.

To convert the speed of the satellite from miles per hour to kilometers per second, we need to use the conversion factors provided.

Given:

Speed of the satellite = 17,000 miles/hour

One kilometer = 0.62 mile

One hour = 3,600 seconds

To convert miles to kilometers, we can use the conversion factor:

1 mile = 1.60934 kilometers

To convert hours to seconds, we can use the conversion factor:

1 hour = 3,600 seconds

Now, let's calculate the speed of the satellite in kilometers per second:

Speed in kilometers per hour = 17,000 miles/hour * 1.60934 kilometers/mile = 27,358.78 kilometers/hour

Speed in kilometers per second = (27,358.78 kilometers/hour) / 3,600 seconds/hour ≈ 7.6 kilometers/second

Therefore, the approximate speed of the satellite, expressed to the correct number of significant figures, is approximately 7.6 km/s.

The correct answer is B. 7.6 km/s.

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