Write a balanced chemical equation for the standard formation reaction of liquid chloroform (CHCI).

Answer:

c

Explanation:

chemicals can be found in every part of our lives

Because HCl is a stronger acid than acetic acid, the pH of 0.01M acetic acid has greater value than the pH of 0.01M HCl. 2.88 is the  pH of a 0.01 M acetic acid.

Any hydrogen that comprises a material capable of giving a proton (a hydrogen ion) to another chemical is defined as acid. A base is indeed a molecule or ion that can receive a hydronium ion from just an acid.

1)Because HCl is a stronger acid than acetic acid, the pH of 0.01M acetic acid has greater value than the pH of 0.01M HCl. The pH value of stronger acid is lower.

2)CH\(_3\)COOH + H\(_2\)O  ⇄ CH\(_3\)COO⁻+  H\(_3\)O⁺

 0.01             0               0

 -x              +x                +x

 0.01-x           +x        +x

Ka=[ CH\(_3\)COO⁻][H\(_3\)O⁺]/[CH\(_3\)COOH]

1.8×10⁻⁵ = [x][x ]/[  0.01-x ]

x=1.34×10⁻³

pH = -log[H⁺]

     =  -log[1.34×10⁻³]

     =2.88

Therefore, because HCl is a stronger acid than acetic acid, the pH of 0.01M acetic acid has greater value than the pH of 0.01M HCl. 2.88 is the   pH of a 0.01 M acetic acid.

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Answer:

D

Explanation:

Answer:2Al(s) + 3H2SO4(aq) ==> Al2(SO4)3(aq) + 3H2(g)  ...  balanced equation

Using the stoichiometry of the balanced equation (2 mol Al : 3 mol H2SO4) and dimensional analysis, we can find the mass of Al needed to react with 26.5 ml of 0.542 M H2SO4.

Explanation:

It is polar or non polar is discussed below:

a) Beryllium chloride (BeCl2) is a linear molecule with two chlorine atoms on either side of the beryllium atom. Since the electronegativity of both chlorine and beryllium is similar, the bond between them is nonpolar. Therefore, BeCl2 is a nonpolar molecule. b) Hydrogen sulfide (H2S) is a bent molecule with the two hydrogen atoms and a sulfur atom. The sulfur atom has a higher electronegativity than the hydrogen atom, which leads to a polar covalent bond. Due to the bent shape of the molecule, the polar bonds do not cancel each other out, resulting in an overall polar molecule. c) Sulfur trioxide (SO3) is a trigonal planar molecule with three oxygen atoms surrounding a central sulfur atom. The electronegativity of oxygen is higher than that of sulfur, which creates polar covalent bonds. However, due to the symmetry of the molecule, the polar bonds cancel each other out, resulting in a nonpolar molecule. d) Water (H2O) is a bent molecule with two hydrogen atoms and one oxygen atom. The electronegativity of oxygen is higher than that of hydrogen, resulting in polar covalent bonds. Due to the bent shape of the molecule, the polar bonds do not cancel each other out, resulting in an overall polar molecule.

e) Trichloromethane (CHCl3) is a tetrahedral molecule with one carbon atom and three chlorine atoms. The electronegativity of chlorine is higher than that of carbon, resulting in polar covalent bonds. However, due to the tetrahedral shape of the molecule, the polar bonds do not cancel each other out, resulting in an overall polar molecule.

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Answer:

An experiment that could go extremely wrong or just well.

Answer:

Explanation:

Bro huh??? you can't be asking that on brainly bro ;-;

The six parts of DNA serially are A) adenine B) thymine C) Sugars D) Phosphate E) Guanine F) Cytosine.

DNA  is a hereditary material  which is present in human beings as well as all other living organisms.  Every cell which is present in an organism's body has DNA  which is the same. Most of the DNA is situated in the cell's nucleus and small amount of it can be found in the cell's mitochondria as well.

Information which is stored in DNA is stored as codes made up of four chemical bases namely, adenine, thymine , cytosine and guanine.Human DNA consists of 3 billion bases .The order of the bases determines information which is required for building and maintaining an organism.

DNA bases are capable of pairing up with each other. Adenine pairs with thymine and guanine pairs up with cytosine .Each base is also attached to a sugar molecule  and a phosphate group. A base, phosphate sugar are together called as nucleotides.

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Answer:

b. 51.63%

Explanation:

Step 1: Given data

Step 2: Calculate the mass corresponding to 7.35 × 10⁻³ moles of oxalate

The molar mass of C₂O₄²⁻ is 88.02 g/mol.

7.35 × 10⁻³ mol × 88.02 g/mol = 0.647 g

Step 3: Calculate the mass percent of oxalate in the sample

% w/w = mass of oxalate / mass of the sample × 100%

% w/w = 0.647 g / 1.253 g × 100%

% w/w = 51.63%

Answer: The compound is \(Fe_2(SO_4)_3\)

Explanation:

Molar mass is defined as the mass in grams of 1 mole of a substance.

S.I Unit of Molar mass is gram per mole and it is represented as g/mol.

A. 1 mole of \(Al(NO_3)_3\) weighs = 26.98(1)+14.01(3)+15.99(9) =212.99 g/mol

B. 1 mole of \(C_3H_8\) weighs = 12.01(3)+1.007(8) = 44.1 g/mol

C. 1 mole of \(Fe_2(SO_4)_3\) weighs = 55.84(2)+32.06(3)+15.99(12) = 399.91 g/mol

D. 1 mole of \(CaCl_2\) weighs = 40.07(1)+35.5(2)= 110.98 g/mol

Thus the compound is \(Fe_2(SO_4)_3\)

Answer:

Endothermic is something that needs heat added into it, while exoteric gives heat off

Explanation:

1. Endo(Melting ice)

2. Endo(heat enters the system)

3. Exothermic(making ice)

4. Endothermic( liquid to gas)

5. Exothermic(campfire)

6. exothermic(gas to a liquid)

7. Exothermic (the flame of a candle)

8. Exothermic (heat leaves the system)

9. I don’t know if photosynthesis is exo or endothermic

Phosphatidylserine is a type of phospholipid that is mainly found in cell membranes. Its structure is made up of two fatty acid chains, a phosphate group, a serine molecule, and a glycerol molecule.

The fatty acid chains are hydrophobic, meaning they repel water, while the phosphate group and serine molecule are hydrophilic, meaning they attract water.

The glycerol molecule acts as a bridge that connects the two fatty acid chains to the phosphate group and serine molecule.
The structure of phosphatidylserine is important for its function in the cell membrane.

Because of the hydrophobic and hydrophilic components of its structure, phosphatidylserine is able to form a lipid bilayer, which is a barrier that separates the inside of the cell from the outside environment.

The hydrophilic heads of the phosphatidylserine molecules face outward and interact with water, while the hydrophobic tails face inward and repel water.
Phosphatidylserine also plays a role in cell signaling and apoptosis, which is programmed cell death.

It acts as a signaling molecule by binding to proteins that are involved in cellular pathways.

In addition, phosphatidylserine is translocated to the outer leaflet of the cell membrane during apoptosis, which signals to immune cells that the cell is ready to be removed.
In conclusion, the structure of phosphatidylserine is made up of two fatty acid chains, a phosphate group, a serine molecule, and a glycerol molecule. Its hydrophobic and hydrophilic components allow it to form a lipid bilayer in cell membranes, and it also plays a role in cell signaling and apoptosis.

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Sedimentation, filtration, and coagulation are the treatments that will help remove contaminants from minerals or from the pipes carrying water from a source.

Sedimentation is a process in which suspended particles settle out of water. It is one of the most basic techniques for removing particles from water. As particles settle, they become trapped in the bottom of a container or settle to the ground in an outdoor setting

Filtration is a method of removing particles from a fluid. It is a physical or chemical separation method that separates solids from fluids (liquids or gases) by adding a medium through which only the fluid can pass.

Coagulation is the process of using chemicals to remove contaminants from water. By creating a chemical reaction, coagulation destabilizes particles and causes them to clump together. This helps to remove the contaminants from the water.

Disinfection is the process of eliminating or destroying pathogens that cause infection. Disinfection eliminates harmful microorganisms by destroying or inactivating them. The disinfectant is a chemical or physical agent that is used to destroy or inactivate harmful microorganisms.

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Answer:

flooding

Explanation:

since heavy rainfall, if its greater than usual

this causes flooding

hope this helps:)

The final temperature of aluminum is 57.37°C
Q=mcΔT
This means that the amount of energy produced is equal to the mass of the system multiplied by its change of temperature and multiplied by its specific heat
ΔT=(x−27.5) °C
503.38 = 25 × 0.9 × (x - 35)
(x - 35) =  503.3 / 25 × 0.9
x = 57.37°C
What is specific heat constant?
The specific heat capacity c [J/(kg K)] of tissue describes how much energy is required to change the temperature of 1 kg of tissue by 1 K (=1°C). For example, the lower specific heat capacity of fat compared to other soft tissue indicates, that fat requires less energy to obtain a certain temperature increase. If we multiply specific heat capacity by mass density (ρ·c [J/(m3 K)]), we obtain the energy required to raise the temperature of 1 m3 of tissue by 1 K (=1°C)—that is, a quantity equivalent to a volume-specific heat capacity
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Answer:

Kc = [B₃]²/[A₂]³  = 0.40

Explanation:

3A₂ ⇄ 2B₃  

Given at equilibrium =>  [A₂] =2.5 and [B₃] = 2.5

Kc = [B₃]²/[A₂]³ = (2.5)²/(2.5)³ = (2.5)⁻¹ = 0.40

Answer:

D 4,3,2

Explanation:

4 Co + 3 O2 ----> 2 Co2O3

Answer:

B. Volcanoes released carbon dioxide into the atmosphere and this allowed for the evolution of oxygen-

breathing life forms

Explanation:

Volcanoes are a major source of carbon dioxide and global warming

Volcanoes absorbed water vapor from the atmosphere and made the planet very dry and difficult to live on, the impact that volcanoes had on the early earth.

A volcano is a crack in a planet's crust, such as the one on Earth, that permits hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. Most volcanoes on Earth are located underwater, and they are most frequently found where tectonic plates are diverging or convergent.

The tectonic plates are drifting apart along constructive plate boundaries. To open a fresh passageway for rising hot magma to move on to the surface, the Earth's crust is split apart.

Volcanoes erupt with a tremendously destructive mixture of ash, lava, hot, toxic gases, and rock. Explosions from volcanoes have claimed lives.

Thus, option D is correct.

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The buffer solution has a pH of 5.36.

To find the pH of this buffer solution, use the Henderson-Hasselbalch equation:

pH = pKa + log([A⁻]/[HA])

where pKa = dissociation constant of acetic acid, [A⁻] = concentration of acetate ions, and [HA] = concentration of acetic acid.

Calculate the concentrations of acetate ions and acetic acid in the solution.

The initial moles of acetic acid are:

moles of acetic acid = volume of acetic acid x concentration of acetic acid

moles of acetic acid = 0.020 L x 0.10 mol/L

moles of acetic acid = 0.002 mol

After mixing with sodium acetate, the total volume of the solution is 50 mL, so the concentration of acetic acid and acetate ions are:

[HA] = moles of acetic acid / total volume of solution

[HA] = 0.002 mol / 0.050 L

[HA] = 0.040 M

[A⁻] = concentration of sodium acetate

[A⁻] = 0.10 M

The dissociation constant of acetic acid is pKa = 4.76.

Now, substitute these values into the Henderson-Hasselbalch equation:

pH = pKa + log([A⁻]/[HA])

pH = 4.76 + log(0.10/0.040)

pH = 4.76 + 0.60

pH = 5.36

Therefore, the pH of the buffer solution is 5.36.

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This is a perfect answer

ω

Answer:

Pb(NO₂)₂(aq) + 2 LiCl(aq) ⇒ PbCl₂(s) + 2 LiNO₂(aq)

Explanation:

Let's consider the reaction between aqueous lead (II) nitrite and aqueous lithium chloride to form solid lead (II) chloride and aqueous lithium nitrite.

Pb(NO₂)₂(aq) + LiCl(aq) ⇒ PbCl₂(s) + LiNO₂(aq)

This is a double displacement reaction. We will start balancing Cl by multiplying LiCl by 2.

Pb(NO₂)₂(aq) + 2 LiCl(aq) ⇒ PbCl₂(s) + LiNO₂(aq)

Now, we have to balance Li by multiplying LiNO₂ by 2.

Pb(NO₂)₂(aq) + 2 LiCl(aq) ⇒ PbCl₂(s) + 2 LiNO₂(aq)

The equation is now balanced.

The balanced chemical reaction equation required is; Pb(NO2)2(aq) + 2 LiCl(aq) -----> PbCl2(s) + 2LiNO2(aq)

In order to write a balanced chemical reaction equation, we must write down the symbols of the compounds involved as follows;

lead (II) nitrite  - Pb(NO2)2

lithium chloride - LiCl

lead (II) chloride - PbCl2

lithium nitrite - LiNO2

Recall that the principle of writing a balanced chemical reaction equation is that the number of atoms of each element on both sides of the reaction equation must be the same. The required balanced chemical reaction equation is;

Pb(NO2)2(aq) + 2 LiCl(aq) -----> PbCl2(s) + 2LiNO2(aq)

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Answer:

C4H2N

Explanation:

The empirical formula is the ratio of atoms in the compound. By dividing each number of moles by the smallest number of moles, we can find the ratio of each atom in relation to that smallest value.

Smallest number of moles is N, so

C: 0.1502/0.0376=4.16=4

H: 0.0751/0.0376=2.08=2

N: 0.0376/0.0376=1

Recall that we have to have integers in the empirical formula, so the ratios are rounded to the nearest whole number. With these ratios, we make the formula:

C4H2N

The pOH of the 0.001 M NaOH solution is approximately 3.

To determine the pOH of a solution, we need to know the concentration of hydroxide ions (OH-) in the solution.

In the case of a 0.001 M NaOH solution, we can assume that all of the NaOH dissociates completely in water to form Na+ and OH- ions. Therefore, the concentration of hydroxide ions in the solution is also 0.001 M.

The pOH is calculated using the equation:

pOH = -log[OH-]

Substituting the concentration of hydroxide ions, we have:

pOH = -log(0.001)

Using a calculator, we can evaluate the logarithm:

pOH ≈ 3

Therefore, the pOH of the 0.001 M NaOH solution is approximately 3.

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Answer:

Geothermal is heat from the ground to make electricity, solar is from the sun to make electricity

Explanation:

Answer:

\(r=215pm\)

\(N_{Mn}=20\)

Explanation:

From the question we are told that:

Edge length of the unit cell \(l=608pm\)

a)

Generally the equation for The relationship between edge length and radius is mathematically given by

\(4r=\sqrt{2a}\)

Therefore

\(4r=\sqrt{2*608}\)

\(r=\frac{\sqrt{2*608}}{4}\)

\(r=215pm\)

b)

From the question we are told that:

Density \(\rho=7.297\)

Edge length of \(l=630.0 pm=>630*10^-{10}\)

Therefore Volume  is given as

\(V=l^3\)

\(V=630*10^-{10}^3\)

\(V=2.50047*10^{−22}\)

Generally the equation for Mass is mathematically given by

\(m=Volume*density\)

\(m=V*\rho\)

\(m=2.50047*10^{−22}*7.297\)

\(m=1.83*10^{-21}g\)

Therefore Molarity is given as

\(n=\frac{M}{Molar M}\)

\(n=\frac{1.83*10^{-21}g}{55}\)

\(n=3.32*10^{-23}\)

Finally The atoms in a unit cell is

\(N_{Mn}=Moles*Avogadro\ constant\)

\(N_{Mn}=3.32*10^{-23}*6.023*10^{23}\)

\(N_{Mn}=20\)

The following are the correct statements : . The pressure in the container will be 42.1 mm Hg.

The vapor pressure is the measurement of the tendency of the substance to change in to the gaseous or the vapor state. The vapor pressure of liquid ethyl amine, C₂H₅NH₂, is 40.0 mm Hg at 233 K.A sample of C₂H₅NH₂ is placed in a closed, evacuated container of constant volume at a temperature of 349 K. It is found that all of the C₂H₅NH₂ is in the vapor phase and that the pressure is 63.0 mm Hg. If the temperature in the container is reduced to 233 K.

P1 = 63 mmHg         T1 = 349 K

P2 = ?                        T2 = 233 K

P1 / T1 = P2 / T2

P2 = P1 T2 / T1

P2 = ( 63 × 233 ) / 349

P2 = 42 mmHg

Then ,  The pressure in the container will be 42.1 mm Hg

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The rate law of the experiment is rate = k[H2O2][I-]y, where k is the rate constant, H2O2 is the concentration of hydrogen peroxide, I- is the concentration of iodide ion, and y is the reaction order with respect to iodide ion.

Hydrogen peroxide is a compound made up of two hydrogen atoms and two oxygen atoms (H2O2). It is a colorless, odorless liquid that is slightly more viscous than water and is a strong oxidizing agent. Hydrogen peroxide is highly reactive and is commonly used as a bleaching agent, disinfectant, and antiseptic. It can also be used as a fuel, oxidizer, and propellant. In the environment, hydrogen peroxide is formed naturally by the breakdown of organic matter, such as plants and animals, and is found in rain and snow.

The slope of the experiment, 13.091 ml/s, is equal to k[H2O2]y. Since the slope is 1, the rate law is rate = k[H2O2][I-]1, which means the reaction is first order with respect to iodide ion.

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The amount of heat energy produced when 1 g of hydrogen and 2 g of nitrogen are reacted, is -6.61 KJ

First, we shall obtain the limiting reactant. Details below:

3H₂ + N₂ -> 2NH₃

From the balanced equation above,

28 g of N₂ reacted with 6 g of H₂

Therefore,

2 g of N₂ will react with = (2 × 6) / 28 = 0.43 g of H₂

We can see that only 0.43 g of H₂ is needed in the reaction.

Thus, the limiting reactant is N₂

Finally, we the amount of heat energy produced. Details below:

3H₂ + N₂ -> 2NH₃ ΔH = -92.6 KJ

From the balanced equation above,

When 28 grams of N₂ reacted, -92.6 KJ of heat energy were produced.

Therefore,

When 2 grams of N₂ will react to produce = (2 × -92.6) / 28 = -6.61 KJ

Thus the heat energy produced from the reaction is -6.61 KJ

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No, two samples of NaCl and CoCl2 do not have the same mass, but they have the same number of particles.

Mole is the amount of material containing 6.02214 × 10²³ particles.

Molar mass of NaCl (sodium chloride) is 58.44 g/mol, while molar mass of CoCl2 (cobalt chloride) is 129.84 g/mol. Since both samples have same number of moles, it means that they contain same number of particles of their respective compounds. However, mass of each sample will be different due to the difference in molar mass.

For example, if we assume that both samples contain 1 mole of their respective compounds, then mass of NaCl sample will be 58.44 g, while  mass of CoCl2 sample will be 129.84 g. So, two samples have different masses but the same number of particles.

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