Write balanced equations for each of the following by inserting the correct coefficients in the blanks:
(a) __Cu(s) +__S₈(s) → Cu₂S(s)

The compound in which nitrogen has an oxidation number of -3 is  \(NH_3\) (ammonia).

In \(NH_3\) , the nitrogen atom has an oxidation number of -3. This is because each hydrogen atom in \(NH_3\) has an oxidation number of +1, and the sum of the oxidation numbers in a neutral molecule is zero.

Since ammonia is neutral, the total of the hydrogen atoms' oxidation numbers must balance out the overall charge, resulting in nitrogen having an oxidation number of -3.

Let's look at the other compounds listed:

        nitrogen.

        Oxygen typically has an oxidation number of -2 in compounds, so if    

        we assume the oxidation number of oxygen as -2, the sum of the  

        oxidation numbers for nitrogen in \(N_2O_5\) would be +10 (since there

         are five oxygen atoms).

        The, nitrogen in \(N_2O_5\) does not have an oxidation number of -3.

       Since the molecule is neutral, the nitrogen atom must have an

         oxidation number of +2 to balance out the overall charge.

         The, nitrogen in NO does not have an oxidation number of -3.

        oxidation number of -2, following their usual oxidation state.

        To balance out the overall charge of the molecule, the nitrogen    

         atom in\(NO_2\) has an oxidation number of +4.

        The nitrogen in \(NO_2\) does not have an oxidation number of -3.

In summary, among the compounds listed, \(NH_3\) (ammonia) is the only one where nitrogen has an oxidation number of -3.

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Answer:

Although atoms are the smallest units that can be found in all matter, these atoms have a complex structure when experimentally analyzed. In order to understand almost all concepts in chemistry, it is essential to clearly understand the basic structure of an atom. Crystals are solid compounds made out of a number of atoms or molecules. There are particular arrangements in crystals. These arrangements are called crystal structures. Examining the crystal structure is very important in determine

Explanation:

Answer:

Although atoms are the smallest units that can be found in all matter, these atoms have a complex structure when experimentally analyzed. In order to understand almost all concepts in chemistry, it is essential to clearly understand the basic structure of an atom. Crystals are solid compounds made out of a number of atoms or molecules. There are particular arrangements in crystals. These arrangements are called crystal structures

Explanation:

Answer:

Sample response: Leaf-cutter ants gather pieces of leaves and store them in their nests to provide raw materials and food for the fungus that grows on the leaf pieces. The ants feed on the fungus, so by collecting leaves the ants are effectively able to grow their own food supply.

Explanation:

Answer:

Leaf-cutter ants gather pieces of leaves and store them in their nests to provide raw materials and food for the fungus that grows on the leaf pieces. The ants feed on the fungus, so by collecting leaves the ants are effectively able to grow their own food supply.

Explanation:

edg 2020

The height of a ramp does not directly determine the strength of the frictional force between a book and an object.

The strength of the frictional force between a book and an object is not directly influenced by the height of a ramp. The nature of the surfaces in contact, the force forcing the surfaces together (normal force), and the coefficient of friction are some of the variables that affect the frictional force between two surfaces.

The coefficient of friction between the book and the object plays a major role in determining the strength of the frictional force.

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Answer:

it's volume also decrease

The required mass of water vaporized is 15.5 grams, from a 250 gram sample of water at the boiling point had 35.0 kj

Given: Mass of water (m) = 250 gHeat added (q) = 35.0 kJHeat of vaporization (ΔHvap) = 40.6 kJ/mole

To find:Mass of water vaporized (x) Formula:q = ΔHvap × nx = (q / ΔHvap) × nMass = moles × molar mass

We know that molar mass of water (H2O) = 18 g/molMoles of water vaporized (n) = (35.0 kJ / 40.6 kJ/mol) = 0.861 mol

Therefore,Mass of water vaporized (x) = 0.861 mol × 18 g/mol= 15.5  

Detailed Solution: According to the given statement,250g of water was taken at its boiling point and 35.0 kJ of heat was added to it, we need to find how many grams of water were vaporized. To solve this question, first, we need to know the heat of vaporization for water, which is 40.6 kJ/mole. It means to vaporize 1 mole of water, 40.6 kJ of heat is required.

Mass of water (m) = 250 g Heat added (q) = 35.0 kJHeat of vaporization (ΔHvap) = 40.6 kJ/molen = q / ΔHvapn = (35.0 kJ / 40.6 kJ/mol) = 0.861 molMoles of water vaporized (n) = 0.861 mol

Therefore, Mass of water vaporized (x) = 0.861 mol × 18 g/mol= 15.5 g Hence, the required mass of water vaporized is 15.5 grams.

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The object with the greatest gravitational pull is the Earth (option D).

Gravitational force is a very long-range, but relatively weak fundamental force of attraction that acts between all particles that have mass. It is believed to be mediated by gravitons.

Newton’s Law of Universal Gravitation states that every particle attracts every other particle in the universe with force directly proportional to the product of the masses and inversely proportional to the square of the distance between them.

The force of gravitational attraction is directly dependent upon the masses of both objects and inversely proportional to the square of the distance that separates their centers.

So as the mass of either object increases, the force of gravitational attraction between them also increases. If the mass of one of the objects is doubled, then the force of gravity between them is doubled. If the mass of one of the objects is tripled, then the force of gravity between them is tripled.

According to this question, Earth has the highest mass among the listed objects, hence, in accordance to the law of universal gravitation, Earth will possess the greatest gravitational pull.

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Explanation:

Iron fillings are magnetic in nature so They get attracted by a magnet.

One is through sublimation, where the mixture is heated and iodine gets converted into gaseous form, leaving behind the iron fillings.

Antibodies against nicotinic acetylcholine receptors (nAChR), present at neuromuscular junction (NMJ), can affect function of junction by interfering with normal signaling between nerve and muscle.

Antibodies against nicotinic acetylcholine receptors (nAChR), which are present at neuromuscular junction (NMJ), can affect the function of junction by interfering with normal signaling between nerve and muscle.

At NMJ, the nerve terminal releases acetylcholine (ACh), which binds to nAChR on muscle cell membrane, leading to depolarization of muscle cell and muscle contraction. If antibodies bind to nAChR, they can block or reduce the number of available receptors for ACh, leading to decrease or even complete loss of the normal muscle response to nerve stimulation.

This can result in muscle weakness, fatigue, and even paralysis, depending on the severity of antibody binding and amount of functional nAChR remaining at the NMJ.

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Answer:

a.

84,791 » 8479

b.

256.75 » 256.8

c.

431,801 » 4318

d.

0.00078100 » 0.0007810

Explanation:

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Formaldehyde is a substance made up of Carbon, Nitrogen, and Oxygen different types of atoms that are chemically combined in a fixed ratio of 1: 2:1. It is classified as an aldehyde.

This refers to a naturally occurring organic compound with the formula CH2O and structure H−CHO. It is also called methanal. The pure compound is a pungent, colorless gas such that it polymerizes spontaneously into paraformaldehyde. It can be stored as an aqueous solution that is formalin. This is also used to store animal specimens.

Formaldehyde is an organic compound. It contains a carbon atom present in its chemical formula. It is also classified as an aldehyde. Formaldehyde(RC=OH) contains a formyl group  and an R group, which is a group that contains carbon and/or hydrogen.

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Answer:

Sorry can't help

Explanation:

Cant help!

The rate of effusion of CO₂ under the same conditions is approximately 6.21 mole/min. Option B.

According to Graham's law of effusion, the rate of effusion of a gas is inversely proportional to the square root of its molar mass. Therefore, we can use the ratio of molar masses to determine the rate of effusion of CO₂ (carbon dioxide) compared to NH₃ (ammonia).

The molar mass of NH₃ is approximately 17.03 g/mol, while the molar mass of CO₂ is approximately 44.01 g/mol.

Let's denote the rate of effusion of CO₂ as x mole/min. Using the ratio of molar masses, we can set up the following proportion:

(√molar mass of NH₃) / (√molar mass of CO₂) = rate of effusion of NH₃ / rate of effusion of CO₂

√17.03 / √44.01 = 2.40 mole/min / x mole/min

Solving for x, we find:

x = 2.40 mole/min * (√molar mass of CO₂) / (√molar mass of NH₃)

= 2.40 mole/min * (√44.01 g/mol) / (√17.03 g/mol)

≈ 6.21 mole/min

Therefore, the rate of effusion of CO₂ under the same conditions is approximately 6.21 mole/min.

The correct answer is (b) 6.21.

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To plate out 7.10 g of chromium, this current will have to be applied for 2.21 hours.

Electroplating is a process in which a metal ion present in a solution is deposited on an electrode by the use of an electric current. The metal ion's positive charge is neutralized as it accepts electrons from the negatively charged cathode (the electrode to be plated). The anode (the electrode with the metal to be deposited) oxidizes and dissolves into the electrolyte solution, providing metal ions to replenish those deposited on the cathode.

The formula to calculate the time is given as;

Time = (Weight of metal)/(Current × 96500 × electrochemical equivalent weight).

Weight of chromium, w = 6.50 g

Current, I = 5.85 A

Electrochemical equivalent weight, E = 0.52

The formula to calculate the time is given as;

Time = (Weight of metal)/(Current × 96500 × electrochemical equivalent weight)Substituting the values;

Time = 6.50/(5.85 × 96500 × 0.52)Time = 2.21 hours.

Therefore, to plate out 6.50 g of chromium, this current will have to be applied for 2.21 hours.

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Answer:

5. Richter magnitude scale

6. Magma

7. Epicenter

8. Seismographs/seismometers

9. Extinct volcanoes

10. Seismogram

The importance of the use of hydrates in fire extinguishers are;

-They keep fire extinguishers dry during shipping and storage.

-They create foams that have high water content to help extinguish fires.

They create high pressure in the cylinder to quickly force out the fire r*tardant.

We know that a fire extinguisher has to do with any device that has been made in such a way that the device can be used to eliminate a flame that is burning. We all know that fore can be very destructive. This implies that it is important to be able to put out the fire so that it does not cause big problems.

The fire extinguisher is composed of certain chemical substances that are able to react together quickly and then be able to quench the flame of the reaction that is going on in the system.

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Answer:

Explanation:

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

From the question

volume = 325 mL

density = 0.874 g/mL

We have

mass = 325 × 0.874

We have the final answer as

Hope this helps you

Answer:

ymc+b×3 is the answer to this question

The equilibrium will shift to the reaction's side where there are less gas molecules as pressure increases.

The balance would then change, moving in the direction of increased pressure. This would be in the direction of the reactants, which contain more moles of the gas. As a result, the equilibrium would change and move to the left in favor of the reactants. Pressure increases cause the equilibrium position to shift to the side with the fewest molecules. Because the pressure lowers as the number of molecules decreases, the impacts of the change are lessened. Due to the forced closer proximity of the gas particles when the pressure on a gas increases, the volume of the gas decreases. On the other hand, because the gas particles may now move further apart when the pressure on a gas lowers, the gas volume rises.

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The command that allows moving a file from one location to another is the "mv command".

The mv command renames or transfers files and folders from one directory to another. A file or directory keeps its base file name when moved to a new directory. All links to other files are preserved when you transfer a file, with the exception of when you move it to a different file system. A directory and its contents are added beneath the existing directory when you transfer a directory into it.

The TargetDirectory option of the mv command allows you to provide a new file name or a new directory path name when renaming a file or directory.

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Answer:

1) Salts X and Y

2) The solubility of the salts

3) a) The solvent

b) The solvent temperature

Explanation:

1) The independent variable is the variable that is suspected to be the cause of the subject of the investigation

The given investigation is meant to investigate the solubility of different salts

Therefore, the solubility is expected to be dependent on the type of salt, and the independent variable is the type of salt, X or Y

2) The dependent variable is the effect meant to be observed in the investigation, which is the solubility of the salt in water at room temperature

3) The control variables are the variables which are held constant during the investigation, including;

a) The solvent used if the investigation; water

b) The temperature of the solvent; Room temperature

To classify these molecules based on whether the substituent group is ortho/para directing or meta directing for electrophilic aromatic substitution, you need to first identify the nature of the substituent group. Here's a step-by-step explanation:

1. Identify the substituent group on the aromatic ring.
2. Determine whether the substituent group is electron-donating or electron-withdrawing.
3. Classify the substituent group accordingly:

- Ortho/para directing: If the substituent group is electron-donating, it usually directs the incoming electrophile to the ortho or para position relative to itself. Common examples of ortho/para directing groups include -OH, -NH2, -OCH3, -CH3.

- Meta directing: If the substituent group is electron-withdrawing, it usually directs the incoming electrophile to the meta position relative to itself. Common examples of meta directing groups include -NO2, -CN, -COOH, -SO3H.

Once you have classified the substituent group, you can place it in the appropriate category (either ortho/para directing or meta directing) based on its directing properties.

The 0.1% glucose as a carbon source in the nitrate medium serves a specific function. Nitrate medium is used for the cultivation of bacteria that can reduce nitrate to nitrite.

The glucose serves as a readily available energy source for these bacteria, which are often found in soil, water, and other environments.

The nitrate reduction process is an anaerobic process, meaning that it occurs in the absence of oxygen. In this process, nitrate is reduced to nitrite by the bacteria.

The presence of glucose ensures that the bacteria have the necessary energy to perform this reduction reaction. Without a carbon source such as glucose, the bacteria would not be able to perform the reaction due to lack of energy.

The 0.1% glucose in the nitrate medium ensures that the bacteria can grow and metabolize the nitrate present in the medium to nitrite, which can then be further metabolized to ammonia by other bacteria. Therefore, the function of the 0.1% glucose in the nitrate medium is to provide the necessary energy source for the bacteria to reduce nitrate to nitrite.

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The oxidation and reduction reactions in a redox reaction are known as redox half-reactions. The oxidation reaction is a half-reaction in which a substance loses electrons, while the reduction reaction is a half-reaction in which a substance gains electrons.

In this case,Oxidizing agent: H+ ions in aqueous HCl are the oxidizing agent. Reducing agent: Zinc metal is the reducing agent. Substances being oxidized: Zinc atoms in the zinc metal are oxidized to Zn2+ ions. Substances being reduced: H+ ions in aqueous hydrochloric acid are reduced to H2 gas.Explanation:Consider the following chemical reaction:Zn(s) + 2 HCl(aq) → ZnCl2(aq) + H2(g)In this reaction, the oxidation state of zinc goes from zero in the solid state to +2 in the aqueous solution.

This means that zinc has lost electrons and has been oxidized. This implies that zinc is the reducing agent in this reaction. The oxidation state of H+ ions in aqueous hydrochloric acid is +1. When H+ ions in hydrochloric acid reduce to H2 gas, their oxidation state drops to zero. This implies that H+ ions are being oxidized and hence they are the oxidizing agent in this reaction. Therefore, the oxidizing agent is H+ ions, the reducing agent is zinc, the substance being oxidized is H+ ions in aqueous hydrochloric acid, and the substance being reduced is zinc metal.

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Answer:

D. Thermal conduction is blocked by the flip-flops.

Explanation:

Convection is a process of heat transfer which involves fluids( liquid or gas). This however rules convection out of the answer.

Radiation involves heat transfer from the sun to bodies on earth.

Conduction involves heat transfer between two solid bodies. Hot beach sand and flip-flops are solid bodies which validates thermal(heat) conduction.

Answer:

D. an ecosystem

Explanation:

An ecosystem is a community of living organisms (biotic factors) interacting with one another and their physical environment (abiotic factors). In an ecosystem, energy is transferred in a unidirectional manner from one organism to another when they feed on one another. For example, energy is transferred to a goat when it feeds on a plant.

Hence, this system in which energy transference occurs between the community of organisms is an ECOSYSTEM. The transfer of energy is one of the interactions between living organisms.

Hydrogen as a fuel: carbon dioxide emissions (although not during combustion) and low energy density. Option B is the correct answer.

Hydrogen as a fuel does not produce carbon dioxide during combustion, which makes it an environmentally friendly option. However, it does present special problems with regard to carbon dioxide (option i) and low energy density (option ii).

i: Carbon dioxide: While hydrogen itself does not produce carbon dioxide during combustion, the production of hydrogen often relies on processes that generate carbon dioxide as a byproduct. For example, steam methane reforming, a common method for hydrogen production, releases carbon dioxide. Thus, addressing the carbon dioxide emissions associated with hydrogen production is a challenge.

ii: Low energy density: Hydrogen has a relatively low energy density compared to other fuels like gasoline or natural gas. This means that a larger volume of hydrogen is required to store the same amount of energy. This poses challenges in terms of storage, transportation, and achieving practical energy storage solutions for hydrogen.

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The (\(CH_3CH_2CH_2CH_2COONa\)) and sodium carbonate (\(Na_2CO_3\)). The sodium pentanoate has a lower molecular mass than the sodium carbonate.

Sodium carbonate is a chemical compound with the formula Na2CO3. It is a sodium salt of carbonic acid and has a strong alkaline taste. It can be found naturally or produced synthetically, and is commonly used in a wide range of industrial and household applications. As a food additive, it is used to regulate acidity and as a preservative. Additionally, it is used in the production of glass, textiles, soaps and detergents, in water treatment, and as an ingredient in various cleaning products. Its natural form, known as natron, is found in mineral deposits and has been used since ancient times. Sodium carbonate is an important industrial chemical, used in a variety of industries for a variety of purposes.

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Answer:

7. Option 2. Atom 1 and Atom 4

8. The same number of valence electron

Explanation:

7. Determination of which symbol represent an isotope.

Isotopes are atoms having the same atomic number but different mass number due to the difference in the neutron number.

From the question given above, the following were obtained:

Z => atomic number

A => mass number

Atom >>> Isotope >>>>> Z >>>> A

1 >>>>>>> ¹⁷₇E >>>>>>>> 7 >>>> 17

2 >>>>>>> ¹⁷₈E >>>>>>> 8 >>>> 17

3 >>>>>>> ¹⁸₆E >>>>>>> 6 >>>> 18

4 >>>>>>> ¹⁸₇E >>>>>>> 7 >>>> 18

From the table above, only atom 1 and 4 has the same atomic number. Hence, atom 1 and atom 4 are isotopes.

8. To know the correct answer to the question, we shall write the electronic configuration of magnesium and calcium. This can be obtained as follow:

Mg (12) => 1s² 2s²2p⁶ 3s²

Valence electron => 2

Ca (20) => 1s² 2s²2p⁶ 3s²3p⁶ 4s²

Valence electron => 2

We can see that magnesium and calcium both have the same valence electron. Hence, they will have similar chemical properties.