Phytic acid, tannins, and oxalates _____the absorption of many minerals.

I think it’s “cathode rays are negatively-charged particles.”

Explanation:

The number of moles of helium in a balloon is equal to 0.135 mol.

A mole is an international standard unit that is used to determine the count of particles in a given amount of substance. The particles counted are commonly chemically similar entities, individually distinct.

A mole can be used to evaluate a huge number of quantities of atoms, molecules, ions, or particular particles. The amount of chemical substance can be determined by the measurement of elementary entities of a given substance in a sample.

The number of units in one mole is 6.023 × 10²³ which is known as Avogadro’s constant.

Given,  the mass of the helium in ballon = 0.54 g

The mass of one mole of Helium = 4.0 g

4.0 g of helium has moles = 1

Then, the number of moles of Helium in 0.54 g He = 0.54/4 = 0.135 mol

Therefore, the number of moles of Helium in ballon is 0.135 mol.

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To answer this problem, let us first define what a buffer solution is.

A buffer solution by definition is an aqueous solution consisting of a mixture of a weak acid and its conjugate base, or a weak base and its conjugate acid.

In this case, we have are going to have a mixture of a weak acid and its conjugate base. Sodium Formate or HCOONa is the conjugate base of that weak acid. Sodium formate is properly written as:

HCOO-Na+

We can find the weak acid by replacing Na+ with H+. Therefore, the other substance should be:

HCOO-H+

or

HCOOH

Answer:

Formic Acid = HCOOH

Answer : The correct option is, [tex]30.9^oC[/tex]

Explanation :

Formula used :

[tex]q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})[/tex]

where,

[tex]q[/tex] = heat released = 24 KJ

[tex]m[/tex] = mass of bomb calorimeter = 1.30 Kg

[tex]c[/tex] = specific heat = [tex]3.41J/g^oC[/tex]

[tex]T_{final}[/tex] = final temperature = ?

[tex]T_{initial}[/tex] = initial temperature = [tex]25.5^oC[/tex]

Now put all the given values in the above formula, we get  the final temperature of the calorimeter.

[tex]q=m\times c\times (T_{final}-T_{initial})[/tex]

[tex]24KJ=1.30Kg\times 3.41J/g^oC\times (T_{final}-25.5)^oC[/tex]

[tex]T_{final}=30.9^oC[/tex]

Therefore, the final temperature of the calorimeter is, [tex]30.9^oC[/tex]

Answer:

Final temperature is 30,9°C

Explanation:

A bomb calorimeter is an instrument that allows the determination of the heat of combustion of a reaction. The heat q is defined as:

q = C×m×ΔT (1)

Where:

C is specif heat of calorimeter (3,41 J/g°C)

m is mass (1,3kg ≡ 1300g)

And ΔT is final temperature - initial temperature (X-25,5°C) X is final temperature

And q is heat (24,0kJ ≡ 24000J)

Replacing in (1):

24000J = 3,41J/g°C×1300g×(X-25,5°C)

5,41 = X-25,5°C

25,5°C + 5,41 = X

30,91°C = X

Final temperature is 30,9°C

I hope it helps!

Answer:  High Reactivity

Explanation:  Alkali metals are the metals which are kept in the group 1 which is also known as S -Block elements.

The electronic configuration of the elements can be written as ns1 .

These are considered to be the most reactive elements of the whole periodic table because their outermost shell has only 1 vacant electron and thus are in need of only 1 electron to complete its duplet or either they can also lose that  one electron .

This the reason they can never be found pure in the nature .

Answer:

3 moles of HClO₄ is required to neutralize 1 mole Al(OH)₃.

Explanation:

The neutralization reaction between HClO₄and Al(OH)₃is as follows:

HClO₄ + Al(OH)₃ -> Al(ClO₄)₃ + H₂O

The balanced reaction is as follows:

3HClO₄ + Al(OH)₃ -> Al(ClO₄)₃ + 3H₂O

Based on the balanced molecular equation the molar ratio of HClO₄ : Al(OH)₃ is 3:1.  

So 3 moles of HClO₄ is required to neutralize 1 mole Al(OH)₃.  

[tex]\boxed{{\text{C}}{{\text{l}}^ - }}[/tex] ionsact as spectator ions if solutions of [tex]{\text{N}}{{\text{H}}_{\text{4}}}{\text{Cl}}[/tex] and [tex]{\text{N}}{{\text{H}}_{\text{3}}}[/tex] are mixed.

Further explanation:

Buffer solution offers resistance to any changes in their pH if strong acid or base is added to them. These are usually aqueous solution consisting of weak acid and its conjugate base.

Buffers can be acidic or basic as described below.

Acidic buffer:

These solutions have pH less than 7 and are formed by weak acid and its conjugate base.

Basic buffer:

These solutions have pH more than 7 and are formed by weak base and its conjugate acid.

Spectator ions are those ions that are present in same form on both sides of the chemical reaction. In other words, these ions do not participate in chemical reactions and cannot affect the reaction equilibrium. Since these are not involved in overall chemical reaction, spectator ions are not included while writing net ionic equations for any chemical reaction.

If solutions of [tex]{\text{N}}{{\text{H}}_{\text{4}}}{\text{Cl}}[/tex] and [tex]{\text{N}}{{\text{H}}_{\text{3}}}[/tex] are mixed, it results in the formation of buffer [tex]{\text{N}}{{\text{H}}_{\text{4}}}{\text{Cl}}[/tex]. is a salt of weak acid and its dissociation occurs as follows:

 [tex]{\text{N}}{{\text{H}}_{\text{4}}}{\text{Cl}} \rightleftharpoons {\text{NH}}_4^ + + {\text{C}}{{\text{l}}^ - }[/tex]

The reaction of given buffer can be written as follows:

[tex]{\text{N}}{{\text{H}}_3} + {{\text{H}}_{\text{2}}}{\text{O}} \rightleftharpoons {\text{NH}}_4^ + + {\text{O}}{{\text{H}}^ - }[/tex]  

Since [tex]{\text{C}}{{\text{l}}^ - }[/tex]  ions are not involved in net chemical reaction for buffer solution of [tex]{\text{N}}{{\text{H}}_{\text{4}}}{\text{Cl}}[/tex] and [tex]{\text{N}}{{\text{H}}_{\text{3}}}[/tex] , these ions act as spectator ions.

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Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Buffer solutions

Keywords: buffer solution, NH4Cl, NH3, NH4+, Cl-, OH-, H2O, buffer, spectator ions.

Answer:

A

Explanation:

The answer is A, fat because of the hydrogen compounds and the carbon center compounds.

In an experiment involving equal amounts of sodium bicarbonate and citric acid, neither is the limiting reactant. Carbon dioxide is produce in this reaction, but its exact amount can't be calculated without further information.

The subject of this question is a classic chemistry reaction involving sodium bicarbonate (baking soda) and citric acid. To determine the limiting reactant in this reaction, we would need to know the balanced chemical equation. However, baking soda and citric acid typically react in a 1:1 ratio. Therefore, since equal masses are used in this question, neither is the limiting reactant because both will be completely used up in the reaction.

Baking soda reacts with citric acid to produce carbon dioxide gas, among other products. The balanced chemical equation for this reaction is: NaHCO3 + C6H8O7 --> H2O + CO2 + Na3C6H5O7. From the stoichiometry of the balanced reaction, we can see that one molecule of sodium bicarbonate reacts to produce one molecule of carbon dioxide. Therefore, we can use molar mass calculations to convert from mass of sodium bicarbonate to mass of carbon dioxide.

However, without all the necessary values (the student's question seems to be cut off), it is not possible to calculate the exact mass of carbon dioxide produced. In stoichiometry, to calculate the mass of a product produced from a known mass of reactant, we usually need to use the molar mass of the reactants and products involved.

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Answer:

true

Explanation:

To determine the pH of a solution which has 0.06 m in sodium benzoate (nac7h5o2) and 0.09 m in benzoic acid (hc7h5o2), we use the ICE table and the acid dissociation constant of hc7h5o2 to determine the concentration of the hydrogen ion present at equilibrium. We do as follows:

HC7H5O2 = H+ + C7H5O2-
NaC7H5O2 = Na+ + C7H5O2-

Therefore, the only source of hydrogen ion would be the acid. We use the ICE table,
                   HC7H5O2           H+        C7H5O2-
I                     0.09                  0              0.06
C                      -x                    +x               +x
------------------------------------------------------------------
E                 0.09-x                x              0.06+ x

Ka = 6.28x10^(-5) = (0.06 + x) (x) / 0.09 -x 
x = 9.40x10^-5 M = [H+]

pH = - log [H+] 
pH = -log  9.40x10^-5 M
pH = 4.03

Therefore, the pH of the resulting solution would be 4.03.

An acid.

An acidic compound.

*Acids increase concentrations of H+ ions.

Answer: Oxygen is the second most abundant gas in our atmosphere. ap

Explanation:

The volume of 32.7 grams of water vapor at standard temperature and pressure can be calculated by first finding the number of moles and then using the Ideal Gas Law.

To solve this problem, we need to use the Ideal Gas Law, which is PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature. Firstly, we calculate the number of moles of the water vapor. Since the molecular weight of water (H2O) is approximately 18 g/mol, 32.7 grams is about 32.7/18 = 1.817 moles. The value of R in liter·kPa/K·mol is 8.314. The temperature T is given in the problem as 273 K.

Now we can put all these values into the Ideal Gas Law:

100 kPa * V = 1.817 mol * 8.314 kPa L−1 K−1mol−1 * 273 K

Solving the above equation for V would give us the volume in liters of the water vapor under the given conditions.

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32.7 grams of water vapor occupies 41.1 liters at standard temperature and pressure (273 K and 100 kPa).

To determine the volume of 32.7 grams of water vapor at standard temperature and pressure (273 K and 100 kPa), we use the ideal gas law, PV = nRT. First, we need to convert the mass of water (H₂O) into moles:

Next, we plug this value into the ideal gas law formula. Given that P = 100 kPa, V is what we need to find, n = 1.814 moles, R (ideal gas constant) = 8.314 J/(mol·K), and T = 273 K:

V = nRT / P
V = (1.814 moles) × (8.314 J/(mol·K)) × (273 K) / (100 kPa)
Since 100 kPa = 100,000 Pa (because 1 kPa = 1000 Pa):

Therefore, at standard temperature and pressure, 32.7 grams of water vapor occupies 41.1 liters.

Answer : The correct option is, (B) Temperature = [tex]0^oC[/tex] and Pressure = 1 atm

Explanation :

STP : STP stands for standard temperature and pressure.

At STP,

The temperature is, [tex]0^oC[/tex] or [tex]32^oF[/tex]

The pressure is, [tex]1atm[/tex] or [tex]101.325kPa[/tex]

The volume is, 22.4 L

Hence, the correct option is, (B) Temperature = [tex]0^oC[/tex] and Pressure = 1 atm

NaOH + HCl →  NaCl + H[tex]_2[/tex]O is the equation for this neutralization reaction and 50 M is the molarity of the acid.

Molarity is also known as concentration in terms of quantity, molarity, or substance. It is a way to gauge how much of a certain chemical species—in this case, a solute—is present in a solution. It refers to the substance in unit solution volume in terms of quantity.

The amount of moles every litre is the molarity unit that is most frequently used in chemistry. One mol/L of a solution's concentration is referred to as its molarity. It is frequently abbreviated as 1 M. A total number of molecules of solute in one litre of solution is the molarity of a specific solution. The changes inside the system's physical parameters determine the molar mass of a solution.

NaOH + HCl →  NaCl + H[tex]_2[/tex]O

no. of moles of NaOH : 20× (25.0÷1000)=0.5 mol

NaCl : HCl

1mol : 1 mol

0.5mol:0.5mol

HCl molarity: 0.5 mol ÷ (10÷1000) =50 M

Therefore, NaOH + HCl →  NaCl + H[tex]_2[/tex]O is the equation for this neutralization reaction and 50 M is the molarity of the acid.

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When aqueous solutions of [tex]\rm NiBr_2\;and\;AgNO_3[/tex]  are mixed, a precipitate form.

A precipitation can occur when two solutions containing different salts are mixed, and a cation/anion pair in the resulting combined solution forms an insoluble salt; this salt then precipitates out of solution.

In the given combination,

[tex]\rm K_2SO_4\;and\;CrCl_3[/tex] : The reaction will result in Group 1A compounds which are soluble.

[tex]\rm NaI\;and\;KBr[/tex] : The reaction will result in Group 1A compounds which are soluble.

[tex]\rm Li_2CO_3\;and\;CSi[/tex] : carbonates with group 1A elements becomes soluble.

[tex]\rm NiBr_2\;and\;AgNO_3[/tex] : The product will be a halide with Ag which are insoluble in water, and thus precipitates out.

When aqueous solutions of [tex]\rm NiBr_2\;and\;AgNO_3[/tex]  are mixed, a precipitate form.

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Food, water, and the cessation of an electric shock serve as reinforcers that increase the likelihood of repeated behaviors due to their roles in satisfying basic physiological needs and removing discomfort.

Food, water, and the termination of a painful electric shock are all forms of reinforcers in the context of psychological behavior studies. According to behaviorism, specifically within the realm of operant conditioning, reinforcers are stimuli which, when presented after a behavior, increase the likelihood that the behavior will occur again. The concept of reinforcers is rooted in the work of B.F. Skinner, who postulated that behavior which is followed by positive outcomes tends to be repeated.

In this context, obtaining food and water satisfies basic physiological needs, which according to Abraham Maslow's Hierarchy of Needs, are fundamental for survival and act as powerful motivators for behavior. Similarly, the termination of a painful electric shock, which is an example of negative reinforcement, removes an unpleasant stimulus and consequently increases the likelihood of the behavior that led to the cessation of the shock.

These examples serve to illustrate the principle that behaviors that lead to satisfying basic needs or removing discomfort are likely to be reinforced, promoting their repetition in the future. Such concepts are essential to understanding motivation and behavioral modification.

To find the number of moles of MgCl₂ in 41.5 g, you divide the mass of the substance by its molar mass. The molar mass of MgCl₂ is 95.21 g/mol, resulting in 0.436 moles of MgCl₂.

To calculate the number of moles of MgCl₂ in 41.5 g, you need to know the molar mass of MgCl₂.

The molar mass is the sum of the mass of one mole of magnesium (Mg) ions and two moles of chloride (Cl) ions.

The molar mass of Mg is 24.305 g/mol and the molar mass of Cl is 35.45 g/mol.

Therefore, the molar mass of MgCl₂ is (1 × 24.305) + (2 × 35.45) = 95.21 g/mol.

Next, use the formula: Number of moles = Mass of substance (g) / Molar mass (g/mol)

Number of moles of MgCl₂ = 41.5 g / 95.21 g/mol = 0.436 moles of MgCl₂.