Which ionic compound is the most likely to dissolve in water?

CaSO4

Na2SO4

BaSO4

SrSO4

Answer:

-283 KJ, exothermic

Explanation:

We are given that

Enthalpy of a mixture of a gases reactants

Change in enthalpy=[tex]\Delat H[/tex]=-228 KJ

Where negative sign represents the enthalpy decreases.

Pressure=Constant.

Work don=w=-55 KJ

We have to calculate the change in energy of the gas mixture during the reaction.

At constant pressure, the change in enthalpy

[tex]\Delta H=\Delta U+P\Delta V[/tex]

Where w=[tex]-P\Delta V[/tex]

Where P=Constant

[tex]\Delta V=[/tex] Change in volume

[tex]\Delta U=[/tex] Change in energy

[tex]\Delta U=\Delta H-P\Delta V[/tex]

[tex]\Delta U=\Delta H+w[/tex]

Substitute the values then we get

[tex]\Delta U=-228-55=-283[/tex] KJ

Hence, the change in energy of the gas mixture during the reaction=-283 KJ

Change in enthalpy is negative it means the reaction is exothermic because the energy is evolved.

The reaction is exothermic, heat is evolved.

From the first law of thermodynamics we know that energy is neither created nor destroyed.

Therefore, the change in energy is obtained from the formula;

ΔU = ΔH + w

ΔU = change in energy

ΔH = Change in enthalpy (heat absorbed or evolved)

w = work done

ΔU = ?

w =  -55kJ

ΔH = -228. kJ

ΔU= -228. kJ + ( -55kJ)

ΔU = -283 kJ

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Answer:

e. two of these choices are correct (b) cohesive and c) adhesive)

Explanation:

Capillary action is essentially the rise of liquids through a narrow tube (region) called as a capillary. There are several forces that come into play in the context of capillary action.

If we consider a liquid like for example, water, then the cohesive forces are responsible for holding the water molecules together (intermolecular attractive force) while the adhesive forces acts between the water molecule and the walls of the capillary (force of attraction between unlike molecules). Surface tension can be defined as the energy required to increase the surface area of a liquid due to the cohesive forces. When adhesive forces become greater than the cohesive forces, the liquid tends to rise up a narrow tube . Thus, both adhesive and cohesive forces are responsible for capillary action.

Capillary action is caused by the combined effect of cohesive and adhesive forces, where the latter must be stronger than the former for the liquid to rise in the capillary tube. So the correct option is e.

Capillary action is responsible for the movement of liquid within narrow spaces without the assistance of external forces, and it is a characteristic property of liquids. This phenomenon occurs due to both cohesive forces and adhesive forces. Cohesive forces are the intermolecular forces that hold a liquid together, whereas adhesive forces are the attractive forces between a liquid and the surface of the capillary. When a liquid is introduced to a capillary tube, these forces work against each other. If the adhesive forces between the liquid and the tube's material are stronger than the cohesive forces within the liquid, the liquid will rise in the tube. This is commonly observed with water in a glass capillary due to the strong adhesion between water molecules and the charged glass surface.

Therefore, the answer to the question, What is responsible for capillary action, a property of liquids? is e. Two of these choices are correct, as it is the combined effect of cohesive and adhesive forces that results in capillary action.

Answer:

C

Explanation:

Edg

Answer:

The correct answer is “Iron(II) sulfide.”

Explanation:

It is pretty obvious there is presented an iconic compound made by iron written as Fe and a sulfur, S that is a nonmental instead. A metal as iron will form a cation and a nonmetal an anion. The sulfur will need 2 electrons from iron in order to complete its octet and in this way the iron equilibrates the sulfur. It can give it 2, so that is why we write it in Roman numbers, and form the formula above.  

Answer: Specific volume of Tungsten is [tex]\frac{8.26*10^-^4ft^3}{lb}[/tex] .

Explanation: The density of Tungsten is given as 1210 lb per cubic feet and it asks to calculate its specific volume.

Density is directly proportional to the mass and inversely proportional to the volume where as specific volume is directly proportional to the volume and inversely proportional to the mass. It means, specific volume is the reciprocal of density.

specific volume = [tex]\frac{1}{density}[/tex]

Let's plug in the given value of the density in above formula:

specific volume = [tex]\frac{1}{1210lb*ft^-^3}[/tex]

specific volume = [tex]\frac{0.000826ft^3}{lb}[/tex]

If we want to write the answer in scientific notations then need to move the decimal four places to the left and so it becomes [tex]\frac{8.26*10^-^4ft^3}{lb}[/tex]

How many orbitals does the n = 4 shell have?

Answer is 16

Answer:

Nonmetals do not conduct electricity.

Explanation:

Most non metals do not conduct electricity because the majority of non metals do not have delocalised electrons, which is normally the case in metals and graphite or mobile ions, which is normally the case in soluble ionic substances, that can carry a charge around a circuit.

Nonmetals have the characteristic of not conducting electricity and are often not malleable. They are also generally not shiny and hard.

A characteristic of nonmetals is that they do not conduct electricity. Unlike metals, which are generally good conductors of electricity, nonmetals have high resistance to the flow of electric current.

Nonmetals are often not malleable, meaning they cannot be easily flattened or bent without breaking. Unlike metals, nonmetals tend to be brittle and breakable.

Nonmetals are generally not shiny and hard. Many nonmetals have dull surfaces and are softer than metals. For example, carbon in the form of graphite is a nonmetal that is soft and dull.

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Answer : The mass of iron metal needed are, 87.4 grams

Solution : Given,

Mass of Al = 150 g

Mass of [tex]Fe_2O_3[/tex] = 250 g

Molar mass of Al = 27 g/mole

Molar mass of [tex]Fe_2O_3[/tex] = 160 g/mole

Molar mass of Fe = 56 g/mole

First we have to calculate the moles of Al and [tex]Fe_2O_3[/tex].

[tex]\text{ Moles of }Al=\frac{\text{ Mass of }Al}{\text{ Molar mass of }Al}=\frac{150g}{27g/mole}=5.55moles[/tex]

[tex]\text{ Moles of }Fe_2O_3=\frac{\text{ Mass of }Fe_2O_3}{\text{ Molar mass of }Fe_2O_3}=\frac{250g}{160g/mole}=1.56moles[/tex]

Now we have to calculate the limiting and excess reagent.

The balanced chemical reaction is,

[tex]Fe_2O_3+2Al\rightarrow Al_2O_3+2Fe[/tex]

From the balanced reaction we conclude that

As, 2 mole of [tex]Al[/tex] react with 1 mole of [tex]Fe_2O_3[/tex]

So, 1.56 moles of [tex]Al[/tex] react with [tex]\frac{1.56}{2}=0.78[/tex] moles of [tex]Fe_2O_3[/tex]

From this we conclude that, [tex]Fe_2O_3[/tex] is an excess reagent because the given moles are greater than the required moles and [tex]Al[/tex] is a limiting reagent and it limits the formation of product.

Now we have to calculate the moles of [tex]Fe[/tex]

From the reaction, we conclude that

As, 2 mole of [tex]Al[/tex] react to give 2 mole of [tex]Fe[/tex]

So, 1.56 mole of [tex]Al[/tex] react to give 1.56 mole of [tex]Fe[/tex]

Now we have to calculate the mass of [tex]Fe[/tex]

[tex]\text{ Mass of }Fe=\text{ Moles of }Fe\times \text{ Molar mass of }Fe[/tex]

[tex]\text{ Mass of }Fe=(1.56moles)\times (56g/mole)=87.4g[/tex]

Thus, the mass of iron metal needed are, 87.4 grams

Answer:

A)  ⁴He₂

Explanation:

²³⁸U₉₂ → ²³⁴Th₉₀ + A

To obtain the missing element (A), we have to first find it's atomic and mass numbers.

The mass number is the sum total of the protons and neutrons in an atom. It is usually equal to the superscript in an atom. for example in ²³⁸U₉₂ the mass number is 238.

The atomic number is the total of the protons in an atom. It is usually equal to the subscript in an atom. for example in ²³⁸U₉₂ the atomic number is 92.

In a chemical eqation, there's conservation of mass.

With this, mass number of products = mass number of reactants. same thing for the atomic number.

Mass number of Product = 238

Mass number of Reactant = 234 + x

238 = 234 + x

x = 238 - 234 = 4

Atomic number of product = 92

Atomic number of reactant = 90 + y

92 = 90 + y

y =  92 -90 = 2

So the atomic number of the missing element is 2 and its mass number is 4.  ⁴A₂.

Among the elements, the only match is  ⁴He₂. So the correct option is A

The energy is required to raise the temperature of 3 g of silver from 15°C to 20°C is

Specific heat capacity of silver (Csp) = 0.237 J/g°C

Given data,

Mass of silver in g (m) = 3g

Initial temperature (T1) = 15 °C

Final temperature (T2) = 20°C

Change in temperature (ΔT)= T2 - T1 = 20-15 = 5°C

Formula,

E = m×Csp×ΔT                           ...(I)

Put the value of all data in equation (i), we get

E = 3g × 0.237 J/g°C ×5°C

E = 3.555 J

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Research indicates that schizophrenia is associated with an abundance of dopamine receptors, but glutamate and serotonin neurotransmitters are also involved, with implications for both symptom manifestation and treatment.

While researchers have discovered that there are an excessive number of receptor sites for dopamine, it is indeed not the only neurotransmitter involved in schizophrenia. The dopamine hypothesis of schizophrenia proposes that an overabundance of dopamine or dopamine receptors is responsible for the onset and maintenance of the disorder. However, this view has evolved, and now it is understood that glutamate also plays a significant role, particularly in the non-competitive antagonism at NMDA receptors, which causes behavioral changes resembling schizophrenia in all three symptom domains - positive, negative, and cognitive. Additionally, serotonin levels may contribute to the disorder, with serotonergic drugs affecting symptomology and second-generation antipsychotics acting as 5HT-2 receptor antagonists. The complexity of neurotransmitter involvement indicates a more nuanced understanding of the etiology of schizophrenia, with the possibility that observed neurotransmitter differences could be a result of the disease, its treatment, or potentially causal to it.

Final answer:

The main difference between a homogeneous mixture and a heterogeneous mixture is that the components of a homogeneous mixture are evenly distributed throughout, making any sample taken from the mixture have the same composition. Conversely, a heterogeneous mixture does not have a uniform composition, and its different components can usually be seen and separated physically.

Explanation:

The main difference between a homogeneous mixture and a heterogeneous mixture is how the components are distributed within the mixture. A homogeneous mixture has its components evenly distributed throughout, meaning any sample taken from the mixture will have the same composition. In contrast, a heterogeneous mixture does not have a uniform composition, and the different components can usually be seen and separated physically. An example of a homogeneous mixture could be a solution of sugar dissolved in water, where the sugar and water are so thoroughly mixed that the composition is the same throughout the solution. On the other hand, a mixture of sand and water serves as an example of a heterogeneous mixture because the sand and water do not uniformly mix, allowing the components to be seen and separated easily.

Final answer:

Tert-butyl iodide reacts faster than tert-butyl chloride in SN1 hydrolysis due to iodide being a better leaving group.

Explanation:

Among the given options, tert-butyl iodide would undergo SN1 hydrolysis faster than tert-butyl chloride. This is because the rate-determining step of an SN1 reaction is the formation of a carbocation. Tert-butyl iodide and tert-butyl chloride both form the same stable tert-butyl carbocation when the leaving group departs. However, iodide is a better leaving group than chloride due to its larger size and weaker bond strength, which facilitates the formation of the carbocation.

The given reactions do not show Mn3+ acting specifically as an acid by donating protons. They primarily involve redox reactions, which describe the transfer of electrons resulting in oxidation state changes for the manganese ion.

When Mn3+ cation acts as an acid, it can donate a proton (H+) to another species. In the presence of water, it could react in a way that would generate hydrogen ions (H+) along with a reduced form of manganese. However, the reactions provided do not directly show Mn3+ acting as an acid. Instead, they involve redox reactions where manganese changes oxidation state. For example, in the reaction MnO4 (aq) + 5Fe²+ (aq) + 8H+ (aq) → Mn²+ (aq) + 5Fe³+ (aq) + 4H₂O(l), Mn goes from an oxidation state of +7 in MnO4- to +2 in Mn2+, which is a reduction.

To write an equation showing Mn3+ acting as an acid, we need to consider a hypothetical reaction where Mn3+ donates a proton to a base such as water (H2O), which is not provided in the given data. Remember, if the correct equation is not clear from the question or additional resources, it is important not to speculate or create inaccurate representations of chemical processes.

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The questions cover various topics in chemistry including chemical equilibrium, reactions, acidity and basicity, solubility, and molarity. Among the key points are that the reaction 2NO2↔N2O4 forms a chemical equilibrium, an endothermic reaction in equilibrium produces more product when the temperature is increased, and a solution is saturated if a crystal of the solute sits at the bottom.

1. The equation 2NO2↔N2O4 represents a chemical equilibrium.

2. If an endothermic reaction is in equilibrium, increasing the temperature will result in more products forming.

3. If a crystal of the solute sits at the bottom of the container, the solution is saturated.

4. To calculate the molarity of a solution, you need to know the moles of solute and the volume of the solution.

5. Out of the listed foods, celery would not taste acidic.

6. A base is defined as a compound that produces hydroxide ions in solution.

7. The salt formed during the reaction between potassium hydroxide and hydrochloric acid is KCl.

8. An acid can be defined as a proton donor.

9. A substance dissolves in water by breaking up into smaller pieces and spreading throughout the water. This process is known as solubility.

10. Stirring increases the rate of solution of a solid in a liquid because solute particles in solution are moved toward the surface of the solid.

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Answer:

A) An equilibrium is reached

Explanation:

Elements consist of tiny particles called atoms.

Atoms are the smallest units of an element that can participate in chemical reactions. They are incredibly tiny, with sizes on the order of 10^{-10} meters. Each element is made up of only one type of atom, and these atoms have a characteristic mass and chemical properties that are unique to that element.

Atoms themselves are composed of even smaller particles called subatomic particles. These include:

Protons: Positively charged particles located in the nucleus (center) of the atom.

Neutrons: Neutrally charged particles that are also found in the nucleus.

Electrons: Negatively charged particles that move around the nucleus in regions called electron clouds or shells.

Final answer:

The formula for chlorine monoxide is Cl₂O, also known as dichlorine monoxide, which reacts with water to form hypochlorous acid.

Explanation:

The formula for chlorine monoxide is Cl₂O. This compound is also known as dichlorine monoxide. It is a yellowish-red gas and can be prepared through several reactions, including the reaction of chlorine gas with mercury oxide. Chlorine monoxide is notable for its role in the degradation of the ozone layer where, for example, it participates in the reaction cycle with ozone to form oxygen. In a reaction with water, it forms hypochlorous acid, illustrating its high water solubility and chemical reactivity.

Explanation:

Sodium has atomic number of 11 with electronic configuration of :

[tex][Na]=1s^22s^22p63s^1[/tex]

Sodium loose it single electron to attain stability of noble gas configuration. While this process electron gets removed from the outer shell of the sodium atom and it gains positive charge of +1.

[tex][Na^+]=1s^22s^22p63s^0[/tex]

[tex]Na\rightarrow Na^++e^-[/tex] (Ionization)

Answer: B. The electrode at which a reduction reaction occurs.

Explanation: I just took the quiz (A P E X)

Cathode is the electrode at which a reduction reaction occurs.

What is Cathode ?
Cathode is the electrode which occurs at reduction and current enters the cell. Cathode attracts cations. Cathode means negative side.

Now check options one by one

Option (A): The electrode not releasers ions into the solutions because here positive ions gains electrons not lose electrons.

So option (A) is incorrect.

Option (B): The electrode at which a reduction reaction occur and current enter in the cell.

So it is correct answer.

Option (C): The electrode that is oxidized in a redox reaction is anode not cathode.

So it is incorrect answer.

Option (D): Anode is the electrode which loses the electrons.

So, option (D) is incorrect.

Thus, we can say that Cathode is the electrode at which a reduction reaction occurs.

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