In the periodic table hydrogen is placed in Group 1A (group 1) and helium is placed in Group 8A (group 18). The most likely reason for this is:

Answer:

Explanation:

           The world is made up of ​living beings .    

Answer:

Vanadium

Explanation:

Atomic number increases, thereby changing into an atom of Vanadium

Answer:

Vanadium

Explanation:

Science rocks

The measurement that represents the most pressure is option c. 56.4 kPa (option c).

To determine which measurement represents the most pressure among the given options, we need to compare the values in the appropriate units.

a. 513 mmHg: This measurement represents pressure in millimeters of mercury. To compare it with other units, we need to convert it to a common unit.

  1 atm = 760 mmHg

  Therefore, 513 mmHg is approximately 0.674 atm.

b. 387 torr: Torr is another unit of pressure that is equivalent to mmHg. Since 1 torr is equal to 1 mmHg, we can directly compare it to the previous value.

  Therefore, 387 torr is approximately 0.509 atm.

c. 56.4 kPa: This measurement represents pressure in kilopascals. To compare it with other units, we need to convert it to a common unit.

  1 atm = 101.325 kPa

  Therefore, 56.4 kPa is approximately 0.556 atm.

d. 0.995 atm: This measurement is already given in atmospheres, which is a common unit of pressure.

Comparing the values, we can see that option c. 56.4 kPa has the highest value, approximately 0.556 atm. Therefore, option c represents the most pressure among the given options.

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Answer:

They are called homogenous mixtures. If you put sand into a glass of water, it is considered to be a mixture. You can always tell a mixture, because each of the substances can be separated from the group in different physical ways. You can always get the sand out of the water by filtering the water away.

Answer:

Sifter

Explanation: They are called homogenous mixtures. If you put sand into a glass of water, it is considered to be a mixture. You can always tell a mixture, because each of the substances can be separated from the group in different physical ways. You can always get the sand out of the water by filtering the water away.

The complete balanced chemical reaction can be written from the half reaction in acidic solution is,

           NO3- + 4H+ + 3e ----> NO + 2H2O.

The half reaction is the part of reaction which represents either an oxidation or a reduction. There are two half-reactions. one is oxidation and other is reduction. Both are necessary to completely describe a redox reaction.

NO3- ----> NO.

This reaction is not balanced and not completed.

NO3- + 4H+ + 3e----> NO + 2H2O.

This is a balanced chemical reaction. A balanced equation contains the same number of each type of atoms on both the left and right sides of the reaction arrow. To write a balanced equation, the reactants go on the left side of the arrow, while the products go on the right side of the arrow.

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\( \huge \purple{\tt{Answer:}} \)

a. Autotrophic

Answer:

3 Electron shell/orbit

Explanation:

the number of shell an element has is what determines the period of that element.

Answer:

i believe it is covalent

Explanation:

The flow of chilled water through the cooling coil is regulated by a control valve.

In HVAC systems, the flow of chilled water through the cooling coil is regulated by a device called a control valve. The control valve is responsible for adjusting the flow rate of chilled water based on the cooling demand of the system. It ensures that the right amount of chilled water is supplied to the cooling coil to maintain the desired temperature in the conditioned space.

The control valve is typically controlled by a building automation system or a thermostat. These devices monitor the temperature in the conditioned space and send signals to the control valve to open or close. When the temperature rises above the set point, the control valve opens to allow more chilled water to flow through the cooling coil, cooling the air. Conversely, when the temperature falls below the set point, the control valve closes to reduce the flow of chilled water.

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The flow of chilled water through the cooling coil is regulated by a control valve. This valve adjusts the flow rate based on the cooling needs of the system.

A thermostat or temperature sensor provides signals to the control valve, which opens or closes accordingly.

When the temperature exceeds the desired setpoint, the control valve opens, allowing more chilled water to pass through the cooling coil.

This increases cooling capacity and lowers the air or space temperature.

Conversely, the control valve closes when the temperature reaches or falls below the set point, reducing chilled water flow.

The control valve ensures precise temperature control and efficient cooling operation in the system.

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Answer:

ddwadadadadwd

Explanation:

Answer:

2, 2, 2, 2, 3, 2, 3

Explanation:

The coefficient of the equation (i) CH₄ + O₂ → CO₂ + H₂O are 2, 2 the coefficient of equation (ii) CaCl₂ + AgNO₃ → Ca(NO₃)₂ + AgCl are 2, 2  and the coefficient of equation (iii) C₂H₆O + O₂ → CO₂ + H₂O are 3, 2, 3.

The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.

Here the given equations are

(i) CH₄ + O₂ → CO₂ + H₂O

(ii) CaCl₂ + AgNO₃ → Ca(NO₃)₂ + AgCl

(iii) C₂H₆O + O₂ → CO₂ + H₂O

Now balance the equation (i)

CH₄ + O₂ → CO₂ + H₂O

Reactant side             Product Side

C = 1                              C = 1

H = 4                             H = 2

O = 2                             O = 3

In the reactant side there are 4 H atoms and in product side there are 2 H atoms are present. So multiply by 2 in the product side to balance the H atoms.

CH₄ + O₂ → CO₂ + 2H₂O

Reactant side             Product Side

C = 1                              C = 1

H = 4                             H = 4

O = 2                             O = 4

In the reactant side there are 2 O atoms and in product side there are 4 H atoms are present. So multiply by 2 in the reactant side to balance the O atoms.

CH₄ + 2O₂ → CO₂ + 2H₂O

Reactant side             Product Side

C = 1                              C = 1

H = 4                             H = 4

O = 4                             O = 4

Here we can see that the equation is balanced. The coefficient are 2, 2.

Now balance the equation (ii)

CaCl₂ + AgNO₃ → Ca(NO₃)₂ + AgCl

Reactant side             Product Side

Ca = 1                             Ca = 1

Cl = 2                              Cl = 1

Ag = 1                              Ag = 1

N = 1                                N = 2

O = 3                               O = 6

In the reactant side there are 2 Cl atoms and in product side there is 1 Cl atom is present. So multiply by 2 in the product side to balance the Cl atoms.

CaCl₂ + AgNO₃ → Ca(NO₃)₂ + 2AgCl

Reactant side             Product Side

Ca = 1                             Ca = 1

Cl = 2                              Cl = 2

Ag = 1                              Ag = 2

N = 1                                N = 2

O = 3                               O = 6

In the reactant side there is 1 Ag atom and in product side there are 2 Ag atoms are present. So multiply by 2 in the reactant side to balance the Ag atoms.

CaCl₂ + 2AgNO₃ → Ca(NO₃)₂ + 2AgCl

Reactant side             Product Side

Ca = 1                             Ca = 1

Cl = 2                              Cl = 2

Ag = 2                             Ag = 2

N = 2                               N = 2

O = 6                               O = 6

Here we can see that the equation is balanced. The coefficient are 2, 2.

Now balance the equation (iii)

C₂H₆O + O₂ → CO₂ + H₂O

Reactant side             Product Side

C = 2                              C = 1

H = 6                              H = 2

O = 3                              O = 3

In the reactant side there are 2 C atoms and in product side there is 1 C atom is present. So multiply by 2 in the product side to balance the C atoms.

C₂H₆O + O₂ → 2CO₂ + H₂O

Reactant side             Product Side

C = 2                              C = 2

H = 6                              H = 2

O = 3                              O = 5

In the reactant side there are 6 H atoms and in product side there are 2 H atoms are present. So multiply by 3 in the product side to balance the H atoms.

C₂H₆O + O₂ → 2CO₂ + 3H₂O

Reactant side             Product Side

C = 2                              C = 2

H = 6                              H = 6

O = 3                              O = 7    

In the reactant side there are 3 O atoms and in product side there are 7 H atoms are present. So multiply by 3 in the reactant side to balance the O atoms.

C₂H₆O + 3O₂ → 2CO₂ + 3H₂O

Reactant side             Product Side

C = 2                              C = 2

H = 6                              H = 6

O = 7                              O = 7        

Here we can see that the equation is balanced. The coefficient are 3, 2, 3.

Thus, we can say that the coefficient of the equation (i) CH₄ + O₂ → CO₂ + H₂O are 2, 2 the coefficient of (ii) CaCl₂ + AgNO₃ → Ca(NO₃)₂ + AgCl are 2, 2  and the coefficient of equation (iii) C₂H₆O + O₂ → CO₂ + H₂O are 3, 2, 3.

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The correct answer about water constituent associated with staining plumbing and clothing dark brown or black is b. Mn

Mn is the chemical symbol for element Manganese. The water contains numerous elements. Some of them are important for body while others are toxic. The different chemical properties of each element results in varying effects.

The black or dark brown colour of the manganese comes from its oxidation and deposition. Manganese is an important element playing significant role in the body's growth and development. However, it is required in trace elements and optimum level must not be exceeded in the body.

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The statement "Metallic behavior correlates with large atomic size and low ionization energy. Thus, metallic behavior increases down a group and decreases from left to right across a period" is true.

The statement is true because metallic behavior correlates with large atomic size and low ionization energy. So, as you go down a group, the atomic size and ionization energy decrease, resulting in increased metallic behavior. As a result, when going from left to right across a period, the atomic size decreases, and the ionization energy increases, resulting in a decrease in metallic behavior.

As a result, the metallic behavior increases down a group and decreases from left to right across a period.

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Answer:

4.08 grams

Explanation:

Essentially, we're looking for the mass of HCl that "matches" 3.26 grams of magnesium hydroxide.

First, convert 3.26 grams of \(Mg(OH)_2\) into moles by dividing by the molar mass. The molar mass of \(Mg(OH)_2\) is 24.3 + 16 * 2 + 1 * 2 = 58.3 g/mol. So, 3.26 grams is equal to:

3.26 g ÷ 58.3 g/mol = 0.0559 mol \(Mg(OH)_2\)

Notice that from the chemical equation, magnesium hydroxide and hydrochloric acid (HCl) have a ratio of 1 to 2. In other words, for every 0.0559 moles of \(Mg(OH)_2\), there are 0.0559 * 2 = 0.112 moles of HCl.

Finally, convert moles of HCl to grams by multiplying 0.112 by the molar mass, which is 1 + 35.45 = 36.45 g/mol:

0.112 mol HCl * 36.45 g/mol = 4.08 g HCl

The answer is thus 4.08 grams.

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The effects of exposure were more pronounced in fish that had been raised in a less stressful environment, suggesting that environmental conditions can influence the impact of exposure to antidepressants.

1. The class of drugs being investigated in this study is antidepressants. They enter our waterways through excretion by individuals taking the medication, and disposal of unused medication into toilets or sinks that are connected to wastewater treatment plants.

2. C-start is an evasive maneuver that young fish use when they perceive a predator. This is important for larval fish survival because it helps them to avoid being eaten by predators.

3. In this investigation, researchers are testing two hypotheses. The first is that exposure to low levels of antidepressants can affect larval fathead minnows' behavior, and the second is that the effects of exposure will be more pronounced in fish that have been raised in a less stressful environment.

4. The researchers found that exposure to antidepressants at levels found in waterways can have a significant impact on the behavior of larval fathead minnows. Specifically, they found that the fish exposed to antidepressants were less likely to respond to the presence of predators, which could increase their risk of being eaten.

They also found that the effects of exposure were more pronounced in fish that had been raised in a less stressful environment, suggesting that environmental conditions can influence the impact of exposure to antidepressants.

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0.636 liters of the 1.10 M FeCl₃ solution to obtain 0.700 moles of Cl⁻ ions.

Thus, Volume (L)=  moles/ concentration.  0.700 moles of Cl⁻ ions and the concentration of the FeCl₃ solution is 1.10 M, you can plug in these values to calculate the volume.

Volume (L) = 0.700/ 1.10 M,

Volume (L)=  1.10M/ 0.700moles

Volume (L) = 0.700/ 1.10 ≈ 0.636 L

Therefore, approximately 0.636 liters of the 1.10 M FeCl₃ solution to obtain 0.700 moles of Cl⁻ ions.

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An unknown element has three naturally occurring isotopes total average atomic mass 20.18 amu and element from the periodic table is neon

Isotopes are the members of a family of an element that all have the same number of protons but different numbers of neutrons

There are three neon isotopes and the more abundant ²⁰Ne and ²¹Ne are both essentially all primordial, as there is no significant global production of these isotopes and also ²²N

Neon 20 is made up of ten proton and ten neutron the atomic mass unit of the gas is 19.992 and the abundance of the gas is 90.48% and neon 21 is made up of ten proton and eleven neutron and the atomic mass unit of the gas is 20.994 and the abundance is 0.27% and neon 22 is made up of ten proton and twelve neutron and the atomic mass unit of the gas is 21.991 and the abundance of gas is 9.25%

Unknown element from the periodic table is neon

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Answer:

in mountainous regions

Explanation:

The rivers usually begins in mountainous regions. A river's source is typically located in a high area, such a mountain or a hill. A river may have several sources. Some rivers start where an underground natural spring discharges water.

A mountain is an elevated area of the crust of the Earth, typically with steep sides that reveal a substantial amount of bedrock that has been exposed.

Although definitions vary, a mountain is often taller than a hill, rising normally at least 300 meters above the surrounding terrain, and differs from a plateau in having a constrained peak region.

Every river has a beginning place where the water flow starts. We refer to this source as a headwater. Some rivers have their beginnings in hills or mountains, where rainwater or snowmelt gathers and creates little channels.

It is possible for the headwater to originate from mountain snowmelt or rainfall, but it is also possible for it to bubble up from the ground or develop at the edge of a lake or big pond.

Thus, option C is correct.

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Answer:

\(MgO _{(s)} + 2H {}^{ + } _{(aq)} = Mg {}^{2 + } _{(aq)}+ H _{2} O _{(l)} \\ \)

The addition of metal alloy to glass ionomers produces a product that can be used for core buildups and the repair of fractured cusps and amalgam fillings as well as abutments for overdentures.

Alloy is generally a metallic substance which is made of two or more elements. e.g., bronze.

The constituent of alloys may be metals or non-metals.

The formation of alloy produces wide variety of application.

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Answer:

The identity of an element is its atomic number, which is the number of protons within the nucleus of one of its atoms.

Explanation:

In air, green light has a wavelength of 530 nm and impacted on emerald with a coefficient of refraction of 1.59.

The duration of a periodic wave is the distance over which the wave's form repeats in physics.  It is the distance between two successive matching places of the same phase on the wave, such as two neighbouring crests, troughs, or zero crossings, and it is a feature of both moving and standing waves, as well as other spatial wave patterns.

The spatial frequency is the opposite of the spectrum. The Greek symbol lambda () is frequently used to represent wavelength. In the case of a sinusoidal wave travelling at a constant speed, wavelength is inversely proportionate to frequency: waves with higher frequencies have shorter wavelengths, and waves with lower frequencies have longer wavelengths.

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Answer:

it is a replacement reaction

The molecular mass and molar mass of carbon monoxide are both 28.01 g/mol.

Molecular mass is the mass of one molecule of a substance, measured in atomic mass units (amu). Molar mass is the mass of one mole of a substance, measured in grams per mole (g/mol).

To find the molecular mass of carbon monoxide, we add the atomic mass of carbon (12.01 amu) to the atomic mass of oxygen (16.00 amu):
12.01 amu + 16.00 amu = 28.01 amu.

Since the molecular mass and molar mass are numerically equivalent, the molar mass of carbon monoxide is also 28.01 g/mol.

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For each combination, we can determine whether it can be a buffer or not: Weak acid and its conjugate base, Weak base and its conjugate acid can be buffer, Strong acid and strong base, Weak acid and strong base, Weak base and strong acid can not be a buffer.

Weak acid and its conjugate base: This combination can be a buffer, as it contains a weak acid and its corresponding conjugate base. When a strong acid is added to the solution, the conjugate base will react with the acid to form the weak acid, thus minimizing the change in pH.

Weak base and its conjugate acid: This combination can also be a buffer, as it contains a weak base and its corresponding conjugate acid. When a strong base is added to the solution, the conjugate acid will react with the base to form the weak base, minimizing the change in pH.

Strong acid and strong base: This combination cannot be a buffer, as it does not contain a weak acid or a weak base. When a strong acid or strong base is added to the solution, it will completely ionize and cause a large change in pH.

Weak acid and strong base: This combination cannot be a buffer, as the weak acid will be completely consumed by the strong base, resulting in the formation of the conjugate base and a large change in pH.

Weak base and strong acid: This combination also cannot be a buffer, as the weak base will be completely consumed by the strong acid, resulting in the formation of the conjugate acid and a large change in pH.

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The positively charged center in an atom is called as Nucleus. It is made up of positively charged protons and neutral sub-atomic particle called as neutrons.

What is meant by protons ?

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a 0.5222 −g sample of an unknown monoprotic acid was titrated with 9.98×10−2 . the equivalence point of the titration occurs at 23.72 ml. the molar mass of the unknown acid is 220.63 g/mol.

To find the molar mass of the unknown monoprotic acid, we can use the concept of stoichiometry and the given information from the titration.

The equivalence point of the titration occurs when the moles of acid are equal to the moles of the titrant.

First, let's calculate the number of moles of the titrant used in the titration:

moles of titrant = volume of titrant × molarity of titrant

moles of titrant = 23.72 ml × (9.98×10^(-2) mol/ml)

moles of titrant ≈ 2.3666 × 10^(-3) mol

Since the unknown acid is monoprotic, the number of moles of the acid is equal to the number of moles of the titrant.

moles of acid = 2.3666 × 10^(-3) mol

Next, we can calculate the molar mass of the unknown acid using the formula:

molar mass (g/mol) = mass of acid (g) / moles of acid

Given that the mass of the acid is 0.5222 g and the moles of acid is 2.3666 × 10^(-3) mol, we can substitute these values into the formula:

molar mass (g/mol) = 0.5222 g / (2.3666 × 10^(-3) mol)

Calculating the value:

molar mass (g/mol) ≈ 220.63 g/mol

Therefore, the molar mass of the unknown monoprotic acid is approximately 220.63 g/mol.

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Answer:

Hey mate.....

Explanation:

This is ur answer.....

Volcanoes are closely associated with plate tectonic activity. Most volcanoes, such as those of Japan and Iceland, occur on the margins of the enormous solid rocky plates that make up Earth's surface.

Hope it helps!

Brainliest pls....

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Answer:

They are closely related the most to Plate Tectonics. They're usually at Convergent plate boundaries.

Explanation:

Hope this helped! Sorry if I'm wrong.

-Bella