Lattice energy is an estimate bond of the bond:
-conductivity
-group
-length
-strength



The answer is *strength*

Answer:

c. The circulatory system moves oxygen throughout the body that is brought in by the respiratory system.

Explanation:

The circulatory system delivers oxygen and nutrients to cells and takes away wastes.

The respiratory system is the network of organs and tissues that help you breathe.

So, of the options, option c is correct.

Hope this helps!

The  statement which  best describes how two body systems work together to maintain homeostasis is that circulatory system moves oxygen throughout the body that is brought in by the respiratory system.

In biology, homeostasis  is the state of steady internal, physical, and chemical conditions maintained by living systems.This is the condition of optimal functioning for the organism and includes many variables, such as body temperature and fluid balance, being kept within certain pre-set limits (homeostatic range).

Other variables include the pH of extracellular fluid, the concentrations of sodium, potassium, and calcium ions, as well as the blood sugar level, and these need to be regulated despite changes in the environment, diet, or level of activity. Each of these variables is controlled by one or more regulators or homeostatic mechanisms, which together maintain life.

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Bond order of N2+ is 2.5. It is a diamagnetic substance.

Bond order is termed as the number of chemical bonds between a pair of the atoms. For example: In case of acetylene the bond order between the two carbon atoms is 3, in diatomic nitrogen the bond order is 3, and the C-H bond order is 1.

The bond order of N2+ is 2.5.

Bond order = 1 / 2[Nb - Na] Where, Nb = no. of electrons in bonding molecular orbital and Na = number of electrons in antibonding molecular orbital.

Bond order = 9-4 / 2

= 2.5

N2+ is diamagnetic in nature because they do not have any unpaired electrons they are having 14 electrons.

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Answer:

b

Explanation:

Answer: The answer would be 158,200

Answer:

Explanation:

Electronegavity is the ability of an atom of an element to attract electrons towards itself, whereas Ionization is the energy required to remove or steal an electron from an atom in its gaseous state.

Answer:

The pituitary gland is located below the brain. :)

Answer:

1. Hidracidas a. MX

2 Acidas c. MHXO

3. Oxacidas  b. MXO

4. Basicas d. M(OH)X

Explanation:

¡Hola!

En este caso, de acuerdo con el concepto de sal, la cual está generalmente dada por la presencia de al menos un metal y un no metal, es posible encontrar cuatro tipos de estas; hidrácidas, oxácidas, básicas y ácidas, en las que las primeras dos son neutras pero la segunda tiene presencia de oxígeno, la tercera tiene iones hidróxido adicionales y la cuarta iones hidrógeno de más.

Debido a la anterior, es posible relacionar cada pareja de la siguiente manera:

1. Hidracidas a. MX

2 Acidas c. MHXO

3. Oxacidas  b. MXO

4. Basicas d. M(OH)XO

En las que M se refiere a un metal, X a un no metal, H a hidrógeno y O a oxígeno.

¡Saludos!

Answer:

\(\huge\boxed{\sf Distillation}\)

Explanation:

Since, both of the chemicals are liquids, we can separate it by the process of distillation.

Distillation:

How it works:

Since chloroform has less boiling point, it will evaporate and collected first and benzene will follow it after sometime.

- Apparatus of distillation is in the attached file.

\(\rule[225]{225}{2}\)

The spheres of Earth that are directly influenced when human-caused air pollution leads to acid rain that dissolves limestone rocks are the geosphere, atmosphere, and hydrosphere.

Acid rain is formed when pollutants such as sulfur dioxide and nitrogen oxides react with water vapor in the atmosphere, forming sulfuric and nitric acid. These acids then fall to the ground in the form of rain or other precipitation. When acid rain falls on limestone rocks, which are part of the geosphere, it causes them to dissolve and erode over time. This process is known as chemical weathering and can lead to the formation of sinkholes and other geological features.

The dissolved limestone can also enter the hydrosphere, affecting the quality of water in rivers, lakes, and other bodies of water. In addition, acid rain can have negative impacts on the atmosphere, such as contributing to the formation of smog and harming vegetation in the biosphere.

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Answer:

p=F/A.Explanation:

Rutherford used scientific investigations to study atoms.

Ernest Rutherford is well-known for his groundbreaking research into radioactivity and also the atom. He discovered that uranium emits two kinds of radiation, alpha as well as beta particles.

An atom is a matter particle that describes a chemical element uniquely. An atom is made up of the central nucleus and one or even more electrons with negative charges. The nucleus has been positively charged as well as contains one or more protons and neutrons, which are relatively heavy particles.

Protons, electrons, and neutrons are the three basic types of particles that make up an atom. Protons and neutrons have roughly the same mass, whereas the weight of an electron seems to be negligible. A proton is positively charged, a neutron is neutral, and an electron has been negatively charged.

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To determine the molar mass of the unknown monoprotic organic acid, we need to use the concept of titration.

Step 1: Calculate the number of moles of NaOH used in the titration.
Molar mass of NaOH = 22.99 g/mol + 16.00 g/mol + 1.01 g/mol = 39.99 g/mol
Number of moles of NaOH = concentration × volume = 0.178 mol/L × 0.0133 L = 0.0023694 mol

Step 2: Calculate the number of moles of the unknown acid.
Number of moles of acid = number of moles of NaOH (according to stoichiometry)
Since the reaction is 1:1, the number of moles of the unknown acid is also 0.0023694 mol.

Step 3: Calculate the molar mass of the unknown acid.
Molar mass of the unknown acid = mass / moles
Molar mass = 0.175 g / 0.0023694 mol ≈ 73.9 g/mol

To determine the molar mass of the unknown monoprotic organic acid, we can use the concept of titration. In this scenario, a 0.175 g sample of the acid is titrated with 0.178 M NaOH solution. The volume of NaOH solution required to neutralize the sample is 13.3 mL. First, we need to calculate the number of moles of NaOH used in the titration. The molar mass of NaOH is 22.99 g/mol for sodium, 16.00 g/mol for oxygen, and 1.01 g/mol for hydrogen, giving us a total molar mass of 39.99 g/mol. Using the concentration of NaOH (0.178 M) and the volume used (0.0133 L), we can calculate the number of moles of NaOH, which is approximately 0.0023694 mol. Next, we need to determine the number of moles of the unknown acid. Since the reaction is 1:1 between the unknown acid and NaOH, the number of moles of the unknown acid is also 0.0023694 mol. Finally, we can calculate the molar mass of the unknown acid by dividing the mass of the sample (0.175 g) by the number of moles (0.0023694 mol). The molar mass of the unknown acid is approximately 73.9 g/mol.

The molar mass of the unknown monoprotic organic acid is approximately 73.9 g/mol.

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Certainly! Here are a few examples of other semi-solid pharmaceutical forms that are distinct from ointments, gels, poultices, pastes, and creams:

1. Transdermal patches: These are adhesive patches that deliver medications through the skin. They are designed to slowly release the drug into the bloodstream over an extended period.

2. Films or strips: These are thin, flexible sheets that dissolve or disintegrate when placed in the mouth. They are often used for delivering drugs orally or sublingually (under the tongue).

3. Oromucosal gels: These gels are designed to be applied to the gums, buccal cavity, or other oral mucosal surfaces. They provide a sustained release of medication and are commonly used for local or systemic drug delivery.

4. Suppositories: These are solid or semi-solid formulations that are inserted into the rectum or vagina. They melt at body temperature, releasing the medication for absorption.

5. Sprays or foams: These formulations are dispensed as a fine mist or foam and can be applied topically, nasally, or orally. They provide easy application and can deliver drugs to specific target areas.

These innovative pharmaceutical forms offer alternative routes of drug delivery and can provide benefits such as improved patient compliance, precise dosing, and targeted drug release.

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Answer:

C2H5OH + 3O2 → 2CO2 + 3H2O

Explanation:

The ratio of the heat of vaporization to the boiling point is known as the entropy of vaporization. The typical entropy of ethanol vaporization is +115 J/mol.K.

Organic substances include ethanol. With chemical formula C2H6O, it is a straightforward alcohol. Its chemical formula can also be expressed as C2H5OH or CH3CH2OH. Ethanol is a volatile, flammable, colorless liquid with a pronounced wine-like aroma and unpleasant taste. Corn and other plant materials are used to make ethanol, a renewable fuel. In the US, ethanol is widely used, and more than 98% of gasoline includes some ethanol. The most widely used ethanol mix is E10, which includes 10% ethanol and 90% gasoline.

Medicines, polymers, lacquers, polishes, plasticizers, & cosmetics are all made with ethanol. Ethanol is employed in medicine as a topical anti-infective as well as an antidote for methanol or ethylene glycol overdose.

Not particularly harmful is ethanol. Minimum doses of 18 to 21% by volume are needed as the only preservative in beverages to ensure microbiological stability.

Calculating the entropy change is as follows:

∆S=(∆H_vap)/T_b

Here, the boiling point temperature is 352 K and the change in enthalpy of vaporization is 40.5 kJ/mol.

Changing values in the equation above:

Therefore, the usual entropy of vaporization is option b, +115 J/mol.K.

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Answer:

2NaOH + 2Al +2H2O = 2NaAlO2 +3H

Explanation:

Aluminum is an amphoteric element it reacts with both bases and acids to form a salt and hydrogen gas.The reaction is highly exothermic.

The glass transition temperature of a polymer is the temperature at which the polymer transitions from a hard and brittle glassy state to a softer and more flexible rubbery state.

It is a characteristic property of amorphous polymers and is dependent on their molecular weight, degree of branching, and chain stiffness.

The melting temperature of a polymer is the temperature at which its crystalline regions melt, and the polymer transitions from a solid to a liquid.

The melting temperature is affected by the size and regularity of the crystalline regions in the polymer, as well as the strength of intermolecular forces.

The glass transition temperature and melting temperature of a polymer are related to the structure of the polymer. Polymers with more rigid and bulky side groups tend to have higher glass transition temperatures because they are less able to pack closely and form a crystalline structure.

On the other hand, polymers with longer and more linear chains tend to have higher melting temperatures because they can pack more closely and form more regular crystalline structures.

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Answer:

False.

I just got it right, lol.

There are 0.8044 moles of oxygen atoms in 65.0 grams of Lead II Chromate.

The molecular formula of lead II chromate is PbCrO4. It is an inorganic compound of lead, chromium, and oxygen with the following molar mass: Molar mass (PbCrO4) = 323.2 g/mol.

Therefore, you can calculate the number of atoms of oxygen in 65.0 grams of Lead II Chromate as follows:

Number of moles of PbCrO4 = Mass of the sample / Molar mass of PbCrO4 = 65.0 g / 323.2 g/mol= 0.2011 moles

Since the molecular formula of PbCrO4 has four oxygen atoms, the number of oxygen atoms in 0.2011 moles of PbCrO4 will be:

Number of oxygen atoms = Number of moles of PbCrO4 × 4 (oxygen atoms per molecule of PbCrO4)

= 0.2011 moles × 4= 0.8044 moles

Therefore, there are 0.8044 moles of oxygen atoms in 65.0 grams of Lead II Chromate.

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Answer

here hope this helps !

A system of linear equations to balance the following chemical reaction:

Limestone, CaCO₃, neutralizes the acid, H₃ O, in acid rain is:

2H₃O + CaCO₃ → 3H₂O + Ca + CO₂

To balance the chemical equation:

H₃O + CaCO₃ → H₂O + Ca + CO₂

We need to ensure that the number of atoms of each element is the same on both sides of the equation.

Let's assign variables to the coefficients of each compound:

H₃O: x

CaCO₃: y

H₂O: z

Ca: a

CO₂: b

Now, we can set up the system of equations based on the number of atoms for each element:

For hydrogen (H):

3x = 2z

For oxygen (O):

3x + 3y = 2z

For calcium (Ca):

y = a

For carbon (C):

y = b

For calcium (Ca):

a = 1

Solving this system of equations will give us the balanced coefficients. Let's solve it:

From the equation y = a, we have y = 1.

From the equation y = b, we have b = 1.

Substituting b = 1 into the equation 3x + 3y = 2z, we have:

3x + 3 = 2z

From the equation 3x = 2z, we have x = (2/3)z.

Substituting x = (2/3)z into the equation 3x = 2z, we have:

3(2/3)z = 2z

2z = 2z

This equation is true for any value of z, indicating that z can take any value.

Therefore, we can choose z = 3 to simplify the coefficients:

x = (2/3)z = (2/3)(3) = 2

y = 1

z = 3

a = 1

b = 1

Thus, the balanced equation is:

2H₃O + CaCO₃ → 3H₂O + Ca + CO₂

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Explanation:

If there were tides on Jupiter, the moon with the greatest influence on the Jupiter tides would be the moon with the greatest mass and closest distance to Jupiter.

explanation for qn:

when converting units, u can show your working in the form

37.5 × 1g/1ml, then convert the g and ml into 1/1000 kg and L, and calculate from there. In the end, u find out its actually a trick qn and 1g/ml = 1 kg/L

A package containing certain hazardous materials would require a primary hazard label of 'Dangerous When Wet'. This label is used to indicate that the material in the package can react dangerously when it comes into contact with water or moisture.

Here are some examples of hazardous materials that would require this label:
1. Sodium: Sodium is a highly reactive metal that can react violently when it comes into contact with water. It produces hydrogen gas and can cause fires or explosions.
2. Potassium: Potassium is another highly reactive metal that reacts vigorously with water, releasing hydrogen gas and potentially causing fires or explosions.

3. Lithium: Lithium is a metal that can also react with water, producing flammable hydrogen gas and heat. This reaction can be dangerous and lead to fires.
4. Calcium carbide: Calcium carbide is a chemical compound that reacts with water to produce acetylene gas, which is highly flammable and can cause explosions.
These are just a few examples of hazardous materials that would require a primary hazard label of 'Dangerous When Wet'. It is important to properly label and handle these materials to ensure safety during transportation and storage.

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Answer:

C₂H₄ + 3O₂  →    2CO₂  + 2H₂O

Explanation:

According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.

This law was given by French chemist  Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

3H₂O   →  3H₂ + 3O₂

This equation do not follow  the law of conservation of mass because there are more oxygen atoms on right side so mass is not conserved.

C₂H₄ + 3O₂  →    2CO₂  + 2H₂O

This equation follow the law of conservation of mass because there are equal number of atoms of all elements on both side of equation.

C  + 4H₂   →   CH₄

This equation do not follow the law of conservation of mass because there are more hydrogen atoms on left side of equation so mass is not conserved.

2Na  + Cl    →  NaCl

This equation also do not follow the law of conservation of mass because there are more sodium atoms on left side of equation so mass is not conserved.

Answer: \(Rb_2S\) < \(K_2S\) < \(Li_2S\)

Explanation:

Lattice energy is the energy required to dissociate 1 mole of the an ionic compound into its constituent ions.

Thus higher is the lattice energy more energy will be required to melt the compounds.

As \(Li_2S\)  has highest melting point,  it will require most energy to melt an hence it will have highest lattice energy. The order of three compounds in order of increasing lattice energy

\(Rb_2S\) < \(K_2S\) < \(Li_2S\)

Group 13 in the periodic table consists of the elements boron (B), aluminum (Al), gallium (Ga), indium (In), and thallium (Tl).

The periodic table is rows and columns arrangement of chemical elements.

The general trends for the properties mentioned:

Density: The density of elements generally increases from boron to thallium. Boron has low density of 2.34 g/cm³ while thallium has a higher density of 11.85 g/cm³.

Boiling point: The boiling point of the elements generally decreases down the group. Boron has the highest boiling point at 4275°C, and thallium has the lowest boiling point at 1457°C.

Melting point: The melting point of elements decreases down the group. Boron has the highest melting point at 2075°C, and thallium has the lowest melting point at 303°C.

Reactivity: The elements in Group 13 have three valence electrons and can lose these electrons to form +3 ion. Reactivity of elements increases down the group, with boron being the least reactive and thallium being  most reactive.

Atomic radius: The atomic radius of elements increases down the group. This is because number of energy levels increases down the group, and  outer electrons are further from the nucleus.

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Answer:

inphysics electromagnetic radiation refers to the waves of the electromagnetic field propagating through space carrying electromagnetic radiant energy it includes radio waves microwaves infrared light ultraviolet X-rays and gamma rays

Answer:

Both the assertion and reason are false

Explanation:

A buffer is a solution that resists changes in acidity and alkalinity. When a solution is buffered, it pH can only vary within a small range. A buffer is made up of a weak acid/base and its salt.

When a strong acid is added to a buffer solution, the conjugate base will react with the H+ from the strong acid to form the undissociated weak acid HA as follows; H+(aq) + A- (aq)→ HA(aq). Hence, H+ concentration decreases owing to its reaction with the A- thus the pH changes only slightly.

At the time when the strong acid should be added so here Both the assertion and reason are false

It is a solution that resists changes with respect to the acidity and alkalinity. When a solution should be buffered, it pH can only change within a small range. At the time when a strong acid should be added to a buffer solution, the conjugate base should be react with the H+ from the strong acid to form the undissociated weak acid.

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Answer:

130

Explanation:

Maintain hot food at 135°F or above. Properly cooked roasts may be held at 130°F or above.

135°F is the minimum hot holding temperature for fried chicken. The most often used scales are indeed the Celsius scale.

Temperature is a physiological measure that quantifies our feelings of hotness and coolness. A thermometer is used to measure temperature.

Thermometers were calibrated in a variety of temperature scales that have traditionally been defined by various reference points including thermometric substances.

The most often used scales are indeed the Celsius scale, with the unit sign °C, the Fahrenheit level (°F), as well as the Scale parameter (K), with the latter being mostly used for scientific reasons. The kelvin is one of the International System of Units' seven basic units (SI). 135°F is the minimum hot holding temperature for fried chicken.

Therefore, 135°F is the minimum hot holding temperature for fried chicken.

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