In a covalent bond:
A. None of these.
B. One atom accepts electrons from another.
C. The atoms attract each other but their electrons do not interact.
D. Both atoms share their electrons.

The binding energy of a nucleus refers to the minimum energy required to separate the nucleus into its constituent nucleons. The binding energy per nucleon (BE/A) is a more useful quantity than the absolute binding energy (BE) since it takes into account the number of nucleons present.

The more tightly bound a nucleus is, the higher its binding energy per nucleon. The equation that determines the binding energy is given by the formula, E=Δmc² where E is the binding energy, Δm is the mass defect, and c is the speed of light. The mass defect is the difference between the actual mass of a nucleus and the sum of the masses of its individual protons and neutrons. The mass of antimony-121 is the sum of the masses of its constituent nucleons, given by: Mass of antimony-121 = (71 x 1.00783 u) + (50 x 1.00867 u) = 120.90380 u The actual mass of antimony-121 is 120.90380 u. Using the mass of each nucleon and the actual mass of antimony-121, the mass defect of the nucleus can be determined as follows: Mass defect (Δm) = [71(1.00783 u) + 50(1.00867 u)] - 120.90380 u= 0.1471 u The binding energy can then be calculated using the formula: E = Δmc²= (0.1471 u)(1.66054 x 10^-27 kg/u)(2.99792 x 10^8 m/s)^2= 2.539 x 10^-10 J/mol To convert this to kilojoules per mole, we can divide by 1000:2.539 x 10^-10 J/mol = 2.539 x 10^-13 kJ/mol Therefore, the binding energy of antimony-121 is 2.539 x 10^-13 kJ/mol.

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Answer:

weathering and erosion

Explanation:

Sand forms when rocks break down from weathering and eroding over thousands and even millions of years. Rocks take time to decompose, especially quartz (silica) and feldspar. Often starting thousands of miles from the ocean, rocks slowly travel down rivers and streams, constantly breaking down along the way.

Answer:

weathering and erosion

Answer:

3

Explanation:

the product of the equation includes 6H....so because there are already 2 hydrogens in the reactants, if you have three of those, or 3*2=6....therefore the coefficient should be 3

Answer:

The answer is negative .

Answer:XY X +Y

Explanation:

general reaction represents a decomposition reaction where a molecule is “broken” in two separate molecules.

Answer:

Metallic compound

Explanation:

Metallic compound -

A metallic compound refers to the species having at least one metal, is known  as a metallic compound.

In general a metallic compound consists of two ions, a positive ion or the cation, is is basically a metal, and,

a negative ion or an anion, which is a non - metal.

Hence, from the given statement of the question,

The correct answer is - metallic compound.  

Answer:

2C3H6 + 9O2 => 6CO2 + 6H20

Explanation:

2C3H6 + 9O2 => 6CO2 + 6H20

C = 6

H = 12

O = 18

When holding food without temperature control, it is essential to mark the food to indicate its time of preparation or removal from temperature control. This practice is crucial for food safety and helps prevent the growth of harmful bacteria that can cause foodborne illnesses.

Marking the food provides a clear visual indication of how long it has been held at room temperature or in a potentially unsafe temperature range. The marking typically includes the date and time of preparation or removal from temperature control. This information allows food handlers and consumers to assess the freshness and safety of the food.

By implementing a clear marking system, it becomes easier to identify when the food should be discarded if it has exceeded the recommended time for holding without temperature control. This helps to prevent the consumption of potentially hazardous food that may have become contaminated or spoiled due to prolonged exposure to unsafe temperatures.

The marking also aids in proper rotation and inventory management. By indicating the time of preparation or removal from temperature control, food handlers can ensure that older items are used or discarded first, reducing the risk of serving expired or unsafe food to customers.

Additionally, marking the food provides a level of accountability and traceability. In the event of a foodborne illness outbreak or food safety inspection, having clear and accurate markings can assist in identifying the source of the issue and implementing corrective actions.

Overall, marking food that is held without temperature control is a crucial practice for maintaining food safety. It helps prevent the consumption of potentially hazardous food, aids in inventory management, and provides accountability and traceability in the event of food safety incidents.

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Answer:

C. C, because it’s the highest of all four and C is 2,5 which is medium but the highest one.

Answer:

Si

Explanation:

Because it has the most electrons among the four

Explanation:

canot understand the question

If more \(H_{2}\) and \(N_{2}\) are added to the reaction 3\(H_{2}\) + N2 → 2\(NH_{3}\) after it reaches equilibrium, two events will occur Shift in Equilibrium and Increased Yield of \(NH_{3}\)

1. Shift in Equilibrium: According to Le Chatelier's principle, when additional reactants are added, the equilibrium will shift in the forward direction to consume the added reactants and establish a new equilibrium. In this case, more \(NH_{3}\) will be produced to counteract the increase in \(H_{2}\) and \(N_{2}\).

2. Increased Yield of \(NH_{3}\): The shift in equilibrium towards the forward reaction will result in an increased yield of \(NH_{3}\). As more \(H_{2}\) and \(N_{2}\) are added, the reaction will favor the production of \(NH_{3}\) to maintain equilibrium. This will lead to an increase in the concentration of \(NH_{3}\) compared to the initial equilibrium state.

It is important to note that the equilibrium position will ultimately depend on factors such as the concentrations of \(H_{2}\), \(N_{2}\), and \(NH_{3}\), as well as the temperature and pressure of the system. By adding more reactants, the equilibrium will adjust to achieve a new balance, favoring the formation of more \(NH_{3}\).

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Wavelength and frequency have an inverse relationship. As we all know, wave velocity equals wavelength times frequency. Wavelength is equal to Wave Velocity Frequency.

The relationship between frequency and wavelength is inversely proportional. The wavelength of the wave with the highest frequency is the shortest. Half the wavelength corresponds to twice the frequency.

The relationship between speed and wavelength is known as frequency. The ratio of speed to frequency is referred to as the wavelength in contrast. Waves of audible sound have a frequency range of 20 to 20 kHz. The wavelength of visible light, on the other hand, is between 400 and 700 nm.

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To establish a metal block's specific heat capacity. Verify that the power supply has been switched off.

To establish a metal block's specific heat capacity. Verify that the power supply has been switched off. Insert the immersion heater through the block's top-center hole. To ensure that the thermometer is enclosed by an excellent conducting medium, insert the thermometer through the smaller hole then add a few drops of oil to the hole. To establish a metal block's specific heat capacity. Verify that the power supply has been switched off.

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The principal factor determining the migration of individual components in the sample in the chromatography of the reaction mixture with water absorbed on cellulose as the stationary phase would be a) hydrogen bonding.

This is because the movement of the components is based on their interaction with the stationary phase, which in this case is water absorbed on cellulose. The components with stronger hydrogen bonding with the stationary phase will have a slower migration rate, while those with weaker hydrogen bonding will have a faster migration rate. The other options, such as solute concentration, stationary phase concentration, and thickness of paper, may also have an effect on the chromatography process, but they are not the principal factor determining the migration of individual components in this scenario.

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The molecular shape of CH2Cl2 based on Lewis structure is tetrahedral.

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Answer:

Explanation:

When comparing the drops of oil and water, one thing I noticed was the shape. The water drop was more defined, whereas the drop of oil began to spread and was much flatter. This may be due to the waxy material, and how both oil and water react to the wax.

There are several factors that can affect the rate at which gypsum dissolves in water. One factor is temperature - increasing the temperature of the water can increase the rate of dissolution.

Another factor is the surface area of the gypsum crystal - breaking the crystal into smaller pieces or grinding it into a powder can increase the surface area and therefore increase the rate of dissolution. Additionally, adding an acidic substance to the water can also increase the rate of dissolution by reacting with the calcium sulfate in gypsum.

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The mass of the excess reagent (iron) that remains after the reaction is complete is 12.1 grams.

The maximum mass of Iron(III) oxide that can be formed is 74.8 grams.

The formula for the limiting reactant is O₂, which is oxygen gas.

Calculate the number of moles of each reactant:

Number of moles of iron = 38.2 g / 55.845 g/mol = 0.683 moles

Number of moles of oxygen = 14.9 g / 32.00 g/mol = 0.466 moles

The balanced equation shows that the stoichiometric ratio between iron and oxygen is 4:3. Therefore, the mole ratio of iron to oxygen is 4:3.

Since the mole ratio of iron to oxygen is greater than 4:3, it means that there is an excess of iron and oxygen is the limiting reactant. So we need to use the number of moles of oxygen to calculate the maximum mass of Iron(III) oxide that can be formed.

The balanced equation shows that 1 mole of iron reacts with 1 mole of oxygen to produce 1 mole of Iron(III) oxide. The molar mass of Iron(III) oxide is 159.69 g/mol.

Number of moles of Iron(III) oxide = 0.466 moles (which is equal to the number of moles of oxygen)

The maximum mass of Iron(III) oxide = Number of moles of Iron(III) oxide x molar mass of Iron(III) oxide

Maximum mass of Iron(III) oxide = 0.466 moles x 159.69 g/mol = 74.8 grams

The maximum mass of Iron(III) oxide that can be formed is 74.8 grams.

The formula for the limiting reactant is O₂, which is oxygen gas.

To calculate the mass of the excess reagent (iron) that remains after the reaction is complete, we need to first calculate the mass of iron that reacted with the oxygen:

Mass of iron reacted = 0.466 moles x 55.845 g/mol = 26.1 grams

The initial mass of iron was 38.2 grams, so the mass of excess iron that remains after the reaction is complete is:

Mass of excess iron = initial mass of iron - a mass of iron reacted

Mass of excess iron = 38.2 g - 26.1 g = 12.1 grams

The mass of the excess reagent (iron) that remains after the reaction is complete is 12.1 grams.

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The type of bonding present in gallium. is metallic bonding which involves the positive atomic nucleus of the gallium atoms being embedded in a sea of mobile valence electrons.

The electrostatic attraction between conduction electrons and positively charged metal ions leads to metallic bonding, a type of chemical bonding. A structure of positively charged ions may share free electrons in this process.

Metallic bonding is responsible for the high melting and boiling points of metals such  as gallium.

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The produced at the anode in the electrolysis of molten CuF2 is A. F₂.

During electrolysis, CuF₂ will separate into Cu₂⁺ cations and F⁻anions. Cu₂⁺ will be reduced to copper metal, which will deposit on the cathode, whereas F⁻ anions will be oxidized to fluorine gas on the anode in the electrolysis of molten CuF₂. Hence, the answer is option A. Fluorine gas (F₂) is generated at the anode in the electrolysis of molten CuF₂.

Therefore, during the electrolysis of molten CuF₂, Cu₂⁺ is reduced to copper metal, which deposits on the cathode, and F⁻ anions are oxidized to fluorine gas on the anode, which is produced at the anode. The chemical reactions taking place during electrolysis of CuF₂ are given below: At the cathode, Cu₂⁺ cations get reduced to copper metal. Cu₂⁺ + 2e⁻ ⟶ Cu. At the anode, F⁻ anions get oxidized to fluorine gas. 2F⁻ ⟶ F₂ + 2e⁻. Therefore, option A is correct.

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Answer:

Independent of initial concentrations

Explanation:

Initial concentrations do not affect equilibrium constant because equilibrium constant is found from equilibrium concentrations.

Answer:

The answer is C

Simplified formula

\(\\ \rm\Rrightarrow N_2H_8C_2O_4\)

Let's count atoms of all

In 1 mol of compound hydrogen is of

\(\\ \rm\Rrightarrow 8mols\)

Formula =>\( \sf N_2H_8C_2O_4\)

Answer:

B

Explanation:

An open system can exchange both energy and matter with its surroundings!

Answer:

It's water.

Explanation:

Water is also called as universal solvent, because it's literally almost the only one we use.

Sorry if I spelled something wrong. I'm Dominican so yeah . I hope this helps you :)

Answer:

In an investigation to determine if the time taken for magnesium to react completely with hydrochloric acid is affected by the concentration of the acid used, students could tell when the reaction was complete by observing the reaction between the magnesium and the hydrochloric acid.

When the magnesium reacts with hydrochloric acid, hydrogen gas is produced as a byproduct. This reaction is exothermic, meaning it releases heat. As the reaction progresses, the magnesium will start to dissolve, and hydrogen gas bubbles will form and be released from the solution.

To determine when the reaction is complete at each concentration of acid, students can observe the reaction mixture and look for the following signs:

The magnesium ribbon stops fizzing: As the reaction progresses, the magnesium ribbon will start to dissolve, and hydrogen gas bubbles will be released from the solution. When the magnesium ribbon stops fizzing, it indicates that the reaction has slowed down significantly or has completely stopped.

The magnesium ribbon has completely disappeared: When the magnesium ribbon has completely dissolved in the hydrochloric acid, it indicates that the reaction is complete.

No more gas bubbles are being produced: As the reaction between magnesium and hydrochloric acid produces hydrogen gas, students can observe the reaction mixture to see if any more gas bubbles are being produced. When no more gas bubbles are being produced, it indicates that the reaction has completed.

By observing these signs, students can determine when the reaction is complete at each concentration of hydrochloric acid and accurately measure the time taken for the reaction to complete.

The amount of aluminum that reacted is approximately 0.069 grams.

To determine the mass of aluminum that reacted, we need to use the ideal gas law and consider the partial pressure of hydrogen gas. First, we calculate the pressure of hydrogen gas by subtracting the partial pressure of water vapor from the total pressure. The pressure of hydrogen gas is 751 mmHg - 26.8 mmHg = 724.2 mmHg.

Next, we convert the pressure of hydrogen gas from mmHg to atm by dividing by 760 mmHg/atm, giving us 0.953 atm.

Using the ideal gas law equation PV = nRT, we can calculate the number of moles of hydrogen gas. The volume of hydrogen gas is given as 37.3 mL, which we convert to liters by dividing by 1000 mL/L, giving us 0.0373 L. The temperature is given as 27°C, which we convert to Kelvin by adding 273.15, giving us 300.15 K. The ideal gas constant R is 0.0821 L∙atm/(mol∙K).

Plugging the values into the ideal gas law equation, we can solve for the number of moles of hydrogen gas: (0.953 atm) * (0.0373 L) = n * (0.0821 L∙atm/(mol∙K)) * (300.15 K).

Simplifying the equation, we find that the number of moles of hydrogen gas is approximately 0.00139 moles.

Since the balanced chemical equation between aluminum and hydrochloric acid is 2Al + 6HCl → 2AlCl₃ + 3H₂, we can conclude that 2 moles of aluminum react to produce 3 moles of hydrogen gas.

Using this ratio, we can calculate the number of moles of aluminum that reacted: (0.00139 mol H₂) * (2 mol Al / 3 mol H₂) = 0.000926 moles Al.

Finally, we can convert moles of aluminum to grams using the molar mass of aluminum (26.98 g/mol): (0.000926 mol Al) * (26.98 g/mol) ≈ 0.069 g Al.

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Answer:

d

Explanation:

the answer is d is that correct

Answer: try thinking with your eyes close

Explanation:

The smallest and least massive atomic particle is the electron, which is negatively charged.Due to the electron's extremely small mass, it is not counted inside the element's atomic number.

Although they are very small and possess a mass of 1/1850 of that of a protons or neutron, electrons carry a negative charge.Since they are so tiny, they do not, in reality, add to the weight of the atom.

These particles are frequently referred to it as subatomic particles since they are the building blocks of atoms.There are protons, neutrons, and electrons, three types of subatomic particles.Protons and electrons, two of a subatomic particles, each have an electrical charge of one or the other.

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