can someone please help me with question 4, i don’t understand?

Acid phosphoric Hydrogen is a triprotic acid, which means that each molecule of acid contains three protons that are acidic.

Radiation therapy can make use of streams of protons produced by specialised equipment.

These electrons move in distinct orbits around the nucleus. (ii) The mass of protons, which have a positive charge, is about 1 amu. His study during this time produced a nuclear reaction that caused the first atom to "split" in two.

The centre of every atom is called the nucleus, which is made up of neutral neutrons and protons (positive particles). Around the nucleus are electrons, which are negative particles. Unlike atoms of different elements, which have varying chemical characteristics and masses, all of an element's atoms have the same mass.

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The balanced dissociation equation for solid barium hydroxide in aqueous solution is: Ba(OH)2(s) → Ba2+(aq) + 2OH-(aq)

Strong base barium hydroxide (Ba(OH)2) totally dissociates in water to form barium ions (Ba2+) and hydroxide ions (OH-). One molecule of barium hydroxide splits into two hydroxide ions and one barium ion in this process. The hydroxide ion has a charge of -1 and is opposite to the barium ion, which has a charge of +2. Strong base dissociation in water, where the solid substance entirely dissolves into ions, is exemplified by this process. To demonstrate how the solid barium hydroxide dissolves in water to create ions, the proper phases for each species involved in the reaction are shown.

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Answer:

a) The balanced chemical equation for the reaction is:

3C (s) + 4H2 (g) → CH4 (g)

In this reaction, 3 carbon atoms combine with 4 molecules of hydrogen to produce one molecule of methane. The representative particles in this reaction are atoms of carbon and molecules of hydrogen and methane.

b) The balanced chemical equation for the reaction is:

2N2 (g) + 7H2 (g) → 2NH3 (g)

In this reaction, 7 molecules of hydrogen react with 2 molecules of nitrogen gas to produce 2 molecules of ammonia. The representative particles in this reaction are molecules of hydrogen, nitrogen, and ammonia.

c) The balanced chemical equation for the reaction is:

H2 (g) + Cl2 (g) → 2HCl (g)

In this reaction, 4 molecules of hydrogen react with 5 molecules of chlorine gas to produce 10 molecules of hydrogen chloride. The representative particles in this reaction are molecules of hydrogen, chlorine, and hydrogen chloride.

To determine the limiting and excess reagents and the amount of unreacted excess reactant, we need to know the initial amounts of each reactant. Without this information, we cannot determine the limiting and excess reagents or the amount of unreacted excess reactant.

The moles of ammonium phosphate produced by the reaction of 0. 085 mol of ammonia is 0.042 moles

The balanced chemical equation for the reaction between phosphoric acid and liquid ammonia to produce ammonium phosphate is:

2NH₃ + H₃PO₄ → (NH₄)₂HPO₄

From the balanced equation, we can see that 2 moles of ammonia react with 1 mole of phosphoric acid to produce 1 mole of ammonium phosphate.

To find the moles of ammonium phosphate produced from 0.085 moles of ammonia, we can use the mole ratio from the balanced equation:

(0.085 moles NH₃) × (1 mole (NH₄)₂HPO₄ / 2 moles NH₃) = 0.0425 moles (NH₄)₂HPO₄

Therefore, the moles of ammonium phosphate produced by the reaction of 0.085 moles of ammonia is 0.0425 moles. The answer should be rounded to the correct number of significant digits, which is 2, since the given value of ammonia has 2 significant digits.

The final answer is 0.042 moles of ammonium phosphate.

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Answer:

≈16.67 grams

Explanation:

To solve this problem, we need to use the atomic mass of titanium to convert the number of atoms to grams. The atomic mass of titanium is 47.867 g/mol, which means that one mole of titanium atoms has a mass of 47.867 grams.

We are given the number of atoms of titanium, which is 2.1 x 10^23. We can use Avogadro's number to convert this to the number of moles of titanium:

2.1 x 10^23 atoms / (6.022 x 10^23 atoms/mol) = 0.349 moles

Now we can use the molar mass of titanium to convert moles to grams:

0.349 moles x 47.867 g/mol = 16.67 grams

Therefore, 2.1 x 10^23 atoms of titanium have a mass of approximately 16.67 grams.

Be(OH)₂ compound is a strong electrolyte.

A solid or liquid that totally or almost completely ionises or dissociates in a solution is considered a strong electrolyte. In the solution, these ions function well as electrical conductors. An early definition of a "strong electrolyte" was a substance that is an effective conductor of electricity when dissolved in water. Strong electrolytes are those that totally dissociate or ionise when placed in aqueous solution. These electrolytes have a high electrical conductivity and a greater ionisation extension. NaCl, HCl, NaOH, etc. are a few examples.

Correct option: Be(OH)₂

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Answer:

Approx. 1200g

Explanation:

You have given the stoichiometric equation:

2LiOH(s)+CO2(g)→Li2CO3(s)+H2O(l)

.And this unequivocally tells us that each mole of carbon dioxide required 2 moles of lithium hydroxide:

Moles of LiOH = 1.3×103⋅g/23.95⋅g⋅mol−1=54.3⋅mol

And thus

27.1⋅mol

CO2 can be absorbed:

27.×44.01gmol−1≅1.2 kg

Explanation:

Answer: The answer is A) -394

Explanation:

This worked for me

Answer:

Cu 2+ (aq) in CuSO4 (aq)

Explanation:

In the reaction between zinc metal and copper (II) sulfate solution, the zinc metal is oxidized and loses electrons to form zinc ions, Zn^2+, which go into the solution as zinc sulfate, ZnSO4. The copper (II) ions, Cu^2+, in copper (II) sulfate solution is reduced and gain the electrons that the zinc metal lost, forming solid copper metal, Cu(s).

So the substance receiving electrons in this reaction is the copper (II) ions, Cu^2+, in CuSO4 solution, which gets reduced to form copper metal.

Answer:

i like butting hole

Explanation:

mkrkr

The following observations could indicate that a reaction had taken place:

C. A rise in temperature

D. A drop in temperature

A change in temperature can indicate that energy has been released or absorbed during the reaction, which can be an indicator that a chemical reaction has taken place.

Changes in volume, on the other hand, are not always an indicator that a chemical reaction has occurred, as they could also be due to physical changes (such as changes in pressure or the addition/removal of a gas). Therefore, A and B alone are not sufficient to indicate that a reaction has taken place.

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The balanced equation is :

2NaOH + H2SO4 → Na2SO4 + 2H2O

2 × 40g of NaOH gives 142g of Na2SO4

200g of NaOH gives = 355g

Therefore,

Mass of Na2SO4 formed = 355g

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When 200 grams of sodium hydroxide (NaOH) is reacted with an excess of sulfuric acid (H2SO4), the reaction produces two moles of water (2 H2O) and one mole of sodium sulfate (Na2SO4).

Sodium hydroxide, commonly known as lye, is an inorganic compound with the chemical formula NaOH. It is a white, crystalline solid that is highly alkaline, with a pH of around 13. Sodium hydroxide is highly soluble in water, with a solubility of 2.2 g/100 mL at 25°C. It is used in many industries, such as in the manufacture of paper, soap, and detergents, as a drain cleaner, and in food processing. Sodium hydroxide can also be used in the laboratory for titrations, pH adjustments, and other purposes.

Since one mole of sodium sulfate is equal to 142 grams, the total amount of sodium sulfate produced in this reaction is 200 grams of NaOH x (1 mole Na2SO4/2 moles NaOH) = 142 grams Na2SO4.

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The time taken to decay is 30 years

In radioactivity, the half-life is the time it takes for half of the radioactive atoms in a sample to decay or disintegrate. The concept of half-life is important in understanding the behavior of radioactive materials and is used to describe the rate of radioactive decay.

Radioactive decay is a random process, which means that the time it takes for an individual atom to decay is unpredictable.

We know that;

N/No = (1/2)^t/t1/2

N = mass at time t

No = initial mass

t = time taken

t1/2 = half life

Thus we have that;

10/40 = (1/2)^t/15

(1/2)^2 = (1/2)^t/15

2 = t/15

t = 30 years

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Answer:

Explanation:

If some of the weighted unknown was lost during the process of adding it to the naphthalene, it would affect the accuracy of the calculated molecular weight. The loss of some of the weighted unknown would result in a smaller mass being added to the naphthalene than what was intended, leading to an underestimation of the molecular weight.

To calculate the molecular weight of the unknown, the mass of the unknown is divided by the mass of the naphthalene that was used, and the result is multiplied by the molecular weight of naphthalene. If some of the unknown was lost, the mass of the unknown that was actually added to the naphthalene would be less than the measured mass of the unknown. As a result, the calculated molecular weight would be smaller than the actual molecular weight of the unknown.

For example, suppose that the measured mass of the unknown was 2 grams, but 0.5 grams were lost during the process of adding it to the naphthalene. If the mass of naphthalene used was 10 grams, the mass of the unknown added to the naphthalene would be 1.5 grams (2 grams - 0.5 grams). If the actual molecular weight of the unknown was 100 g/mol, the calculated molecular weight using the formula would be:

Molecular weight of unknown = (1.5 grams / 10 grams) x 128 g/mol (the molecular weight of naphthalene)

Molecular weight of unknown = 19.2 g/mol

However, the actual molecular weight of the unknown is 100 g/mol, and the loss of some of the unknown resulted in an underestimation of the molecular weight. Therefore, it is important to be as accurate as possible when measuring the mass of the unknown to obtain the most accurate molecular weight calculation.

the boiling point Boiling temperature is the point at which a liquid's vapor pressure equals the atmospheric pressure.

When the liquid's vapor pressure equals the air pressure acting on it, the liquid transitions from a liquid state to a gaseous phase. Although boils is a physical transformation, molecules are still not chemically changed.

The line is broken at the substance's boiling point since a liquid's typical boiling point is now between point B and C the temperature where the fluid and gas are already in equilibrium at one atmosphere of pressure, with the resulting liquid vapor pressure being one atmosphere.

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For the above compounds, the order of increasing lattice energy is MgO, NaCl, CsI, and AlN.

Because the ionic species in MgO have greater charge (Mg+2 and O2- as opposed to Na+ and Cl-), the ionic bond is stronger than it is in NaCl. As a result, MgO has greater ionic connections than NaCl. MgO is hence more ionic than NaCl.

The size of the ions involved has an inverse relationship with lattice energy in ionic compounds. MgO has the highest lattice energy because Mg2+, the smallest of the four ions (because anion is the same in all), is present.

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The molarity of the solution prepared by adding 15. 56 g of the KOH to water to make 250. 0 ml of solution is 1.10 M.

The mass of the KOH = 15.56 g

The volume of the KOH = 250 mL

The molarity is expressed as :

The molarity = moles / volume in L

The number of the moles of the KOH = mass / molar mass

The number of the moles of the KOH =  15.56 / 56.10

The number of the moles of the KOH = 0.277 mol

The molarity = moles / volume

The molarity = 0.277 / 0.250

The molarity = 1.10 M

Thus, the molarity of the solution is 1.10 M with the volume of 250 mL.

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More sunlight is reflected than transmitted by the white upper surface of clouds.

Clouds can affect the temperature on summer days in a few ways. One reason why it can be colder on cloudy summer days is that clouds reflect some of the sun's energy back into space, which means less of the sun's energy reaches the ground. This can result in lower temperatures, as there is less heat to warm the air and the surface of the Earth.

Therefore, the combined effect of reflected solar radiation and scattered light from clouds, and the trapping of heat by water vapor in the clouds can make it feel colder on cloudy summer days, even though it is still summer.

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Answer:

The freezing point of a solution is lowered compared to the freezing point of the pure solvent. The amount of depression of the freezing point is proportional to the molality of the solute. The greater the molality of a solution, the lower its freezing point. To compare the freezing points of these solutions, we need to determine which one has the highest molality.

First, we need to determine the number of particles that each solute will produce in solution, as this affects the amount of depression of the freezing point.

KNO3 dissociates into two ions: K+ and NO3-, so it will produce two particles per formula unit.

BaCl2 dissociates into three ions: Ba2+ and two Cl-, so it will produce three particles per formula unit.

Ethylene glycol does not dissociate in solution, so it will produce one particle per molecule.

Na3PO4 dissociates into four ions: three Na+ and one PO43-, so it will produce four particles per formula unit.

Now, we can calculate the molality (moles of solute per kilogram of solvent) for each solution:

For 0.10 m KNO3: molality = 0.10 mol / 1 kg = 0.10 m

For 0.10 m BaCl2: molality = 0.10 mol x 3 particles / 1 kg = 0.30 m

For 0.10 m ethylene glycol: molality = 0.10 mol / 1 kg = 0.10 m

For 0.10 m Na3PO4: molality = 0.10 mol x 4 particles / 1 kg = 0.40 m

So, the solutions in order of decreasing freezing points are:

0.10 m Na3PO4 (highest molality)

0.10 m BaCl2

0.10 m KNO3 and 0.10 m ethylene glycol (same molality, but KNO3 has a smaller van't Hoff factor than ethylene glycol, so it will have a slightly higher freezing point)

Explanation:

According to Le Chatelier's Principle,  a system that is in equilibrium will adapt to partially offset the effects of fluctuations.

According to Le Chatelier's Principle,  a system that is in equilibrium will adapt to partially offset the effects of fluctuations in temperature, volume, concentration, as well as pressure, leading to a new equilibrium.

In the equation for equilibrium,  4HCl(gas) + O₂(gas) → 2Cl₂(gas) + 2H₂O(gas) + energy. If the system's pressure rises, the equilibrium will move to the right. If the system's pressure drops, the equilibrium will move to the left. Oxygen concentration will drop, and equilibrium will move to the left. If the system's temperature rises, equilibrium will move to the right.

Therefore, according to Le Chatelier's Principle,  a system that is in equilibrium will adapt to partially offset the effects of fluctuations.

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Answer:

The x-axis (horizontal) and the other along the y-axis (vertical).

Explanation:

hope that helped. :')

The balanced chemical equation for the decomposition of dinitrogen pentoxide(N₂O₅) into nitrogen gas (N₂) and oxygen gas (O₂) is: 2 N₂O₅ → 2 N₂ + 5O₂.

In chemistry, a reaction refers to a process in which one or more substances, called reactants, are transformed into one or more different substances, called products. Reactions can be caused by a variety of factors, such as heat, light, or the presence of a catalyst, and they can occur in a wide range of physical states, including gases, liquids, and solids. There are many different types of chemical reactions, which can be classified based on their mechanisms, the nature of the reactants, and the properties of the products. For example, a reaction can be classified as a redox reaction if there is a transfer of electrons between the reactants, or as an acid-base reaction if there is a transfer of protons between the reactants.

Here,

This equation is balanced because it has the same number of atoms of each element on both the reactant and product side. On the left side, there are 2 nitrogen atoms, 10 oxygen atoms, and 2 molecules of N₂O₅. On the right side, there are 2 nitrogen atoms, 10 oxygen atoms, and 1 molecule of O₂ and 1 molecule of N₂.

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Answer:

2.95

Explanation:

To find K for the reaction C ⇌ B, we need to use the equilibrium constant expression for this reaction, which is:

K = [B]/[C]

We can relate the concentrations of B and C to the concentration of A using the equilibrium constants K1 and K2 and the law of mass action, which states that the product of the concentrations of the products raised to their stoichiometric coefficients divided by the product of the concentrations of the reactants raised to their stoichiometric coefficients is equal to the equilibrium constant for the reaction. Using this law, we can write:

K1 = [B]/[A]

K2 = [C]/[A]

We can rearrange these equations to solve for [A] in terms of [B] and [C]:

[A] = [B]/K1

[A] = [C]/K2

Setting these two expressions for [A] equal to each other and solving for [B]/[C], we get:

[B]/[C] = K1/K2

Substituting this expression for [B]/[C] into the expression for K, we get:

K = [B]/[C] = K1/K2

Plugging in the values for K1 and K2, we get:

K = 5.90/2.00 = 2.95

Therefore, the equilibrium constant for the reaction C ⇌ B is 2.95.

For binary ionic compounds (ionic compounds that include only two kinds of elements), the compounds are named via writing the title of the cation first observed with the aid of the name of the anion. For example, KCl, an ionic compound that incorporates K⁺ and Cl⁻ ions, is named potassium chloride.

Answer and Explanation: Option A is the right reply as ionic compounds are made of positively-charged cations and negatively-charged anions. The ensuing electrostatic appeal between the oppositely charged ions is what creates the ionic bond.

Binary Ionic Compounds Containing a Metal and a Nonmetal. A binary compound is a compound formed from two one-of-a-kind elements. ...

Ionic Compounds Containing a Metal and a Polyatomic Ion. Metals combine with polyatomic ions to provide ionic compounds. ...

Acids and Acid Salts. ...

Binary Compounds Between Two Nonmetals.

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part a.)

The initial concentration in solution of the Fe3+ and SCN- is:

moles of Fe3+ = (2.00 x 10^-3 M) x (5.00 x 10^-3 L) = 1.00 x 10^-5 mol

moles of SCN- = (2.00 x 10^-3 M) x (5.00 x 10^-3 L) = 1.00 x 10^-5 mol

part b)

The equilibrium constant for the reaction is 1.54 x 10^10.

Fe(NO3)3(aq) + 3KSCN(aq) ⇌ Fe(SCN)3(aq) + 3KNO3(aq)

b)

Therefore, the equilibrium concentration of Fe(SCN)2+ is also 1.40 x 10^-4 M.

Applying law of mass action, the equilibrium constant expression for the reaction is:

Kc = [Fe(SCN)2+] / ([Fe3+] [SCN-]3)

Kc = (1.40 x 10^-4) / [(1.00 x 10^-5) (1.00 x 10^-5)^3]

Kc = 1.54 x 10^10

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Therefore, the strong nuclear force happens inside ring C.

An atomic model is a scientific theory or explanation of the structure of an atom. The atomic model describes the various parts of an atom, such as the nucleus, protons, neutrons, and electrons, and how they are arranged within the atom. Different atomic models have been proposed over time as our understanding of the atom has developed. The earliest atomic model, proposed by the Greek philosopher Democritus, suggested that atoms were indivisible and indestructible particles. Later, in the early 20th century, experiments led to the development of the modern atomic model, which describes the atom as consisting of a central nucleus made up of protons and neutrons, surrounded by electrons that orbit the nucleus in shells or energy levels. This model is known as the Rutherford-Bohr model. Since then, new atomic models have been developed that take into account the complex behavior of electrons within the atom, such as the quantum mechanical model. These models are used to explain the behavior and properties of atoms and their interactions with other atoms, molecules, and electromagnetic radiation.

Here,

The strong nuclear force occurs inside the nucleus of the atom, where the protons and neutrons are located. In the given diagram, the nucleus is located inside ring C, where there are 4 protons and 5 neutrons.

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Propane gas partial pressure is 300 mm.

Propane gas reaction - C3H8(g)+5O2(g)→3CO2(g)+4H2O(g)

As propane gas is a three-carbon alkali. It has a standard temperature and pressure. It can be compressed into a transport liquid. As per, the gas reacts with the air that is oxygen and gives carbon dioxide. We mix it with the correct ratio then the pressure mix is equal to 300 mm.

The answer is a partial pressure of propane gas 51mmHg and a part of the oxygen gas to be 249 mm. The propane gas is mixed with the oxygen gas and the gas reacts to give out carbon dioxide and thus measuring their correct stoichiometric ratio.

The gas produces a total pressure mix of 300 mg Hg and thus partial pressure is around 51 and that for oxygen is 249 mm. The partial pressure of a gas is 51 mmHg and part of the oxygen gas is 249 mm hg. That of water vapours of 171 mmHg.

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As the forces between each pair of charges will be equal in magnitude and opposite in direction for the force on charge 1 to match with force on charge 2 as when placed on line C , the force lines of charge 2 and 1 will match.

It should be noted that the diagram relating to the question had been attached.

For B, as the force due to charge 3 must be horizontal along D on charge 1 , and the force between 1 and 3 is attractive ,

the charge 3 must be placed at D

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The compound will likely have a high boiling point and be a solid at STP. Ionic compounds are compounds composed of strong electrostatic bonds between a cation (positive ion) and an anion (negative ion).

These strong electrostatic bonds require a large amount of energy to break, resulting in a high boiling point. This high boiling point is due to the strong bond between the cation and anion, and the need to break these bonds in order for the compound to go from the solid to the liquid phase. Additionally, due to the strong electrostatic bonds, the compound is likely to be a solid at STP. These strong forces require high amounts of energy to break the bond, resulting in a high boiling point.  At STP, the electrostatic forces will be strong enough to keep the ions in a solid state.

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