What is the ratio of Al3+ ions to S2- ions in a neutral compound?
A. 1:1
B 2:1
C.2:3
D. 3:2

Answer:

surface tension

Explanation:

Bases are named like ionic compounds.

Bases are named using the following convention:

Bases are substances that can accept protons (H+) or donate pairs of electrons. They typically consist of a metal cation and a hydroxide anion (OH-). When naming bases, the name of the metal cation is written first, followed by the word "hydroxide."

For example:

Sodium hydroxide: NaOH

Calcium hydroxide: Ca(OH)2

Potassium hydroxide: KOH

In these examples, the metal cations (sodium, calcium, and potassium) are named first, followed by the word "hydroxide," which represents the hydroxide anion (OH-). The resulting compounds are ionic in nature.

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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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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

Answer:

C

Explanation:

Edg

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.

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.

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.

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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The final temperature of the calorimeter is 85.71 degree C.

Heat of the reaction is -1235 kJ/mol

Heat discharged at the time of reaction is 1235 kJ/mol

The moles of ethanol are calculated by using the formula mass of ethanol / molar mass of ethanol

= 12.8 g / 46 g/mol = 0.278 moles

Thus, the no. of moles of ethanol is 0.278 moles

The heat released when ethanol is combusted is:

0.278 moles × 1235 kJ/mol = 343 kJ

The final temperature is determined as,

343 kJ = (heat capacity) (temperature difference)

343 kJ = 5.65 (T - 25)

T-25 = 343 / 5.65

T-25 = 60.71

T = 85.71 degree C

Thus, the final temperature is 85.71 degree C.

The final temperature of the system is 85.8°C.

We have the following information from the question;

Mass of ethanol = 12.8 g

Molar mass of ethanol= 46.07 g/mol

Heat of reaction= -1235 KJ/mol

Number of moles = 12.8 g/46.07 g/mol = 0.278 moles

Heat absorbed by calorimeter = number of moles × Heat of reaction =

0.278 moles × -1235 KJ/mol = -343.33 KJ

Given that;

Energy absorbed by the calorimeter = heat capacity × temperature rise

343.33 =  5.65 × (T2 - 25)

343.33 = 5.65T2 - 141.25

343.33 + 141.25 = 5.65T2

T2 = 343.33 + 141.25/5.65

T2 = 85.8°C

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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.

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)

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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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:

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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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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How many orbitals does the n = 4 shell have?

Answer is 16

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]

Answer: The positive and negative charges of the water molecule pull on the negative and positive ends of the ionic molecule to break them apart.

Explanation:  

Ionic compounds dissolve in polar solvents such as water as like dissolves like. Ionic compounds are made up of ions which remain attracted by coloumbic forces.  

Thus to separate the ions, the positive and negative charges of polar solvent pulls the opposite charges of the ionic compounds and thus break them apart. Thus the ionic compounds dissolve in water.

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.

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.