Identify the conjugate base in each pairs

1)RCOOH. RCOO

2)H2PO+. H2PO4

3)RNH2.RNH3+

4)H2CO3.HCO3-

Answer: A. C2H3F

Explanation:

The concentration of the acid is \(0.25 M\).

Titration is a laboratory technique used to determine the concentration of a substance in a solution by reacting it with a standardized solution of known concentration.

The titration formula can be given by,

(Volume of the Base) \(\times\) (Normality of the Base) = (Volume of the Acid) \(\times\) (Normality of the Acid)

\(\Rightarrow V_1N_1=V_2N_2\)

Given, the volume of the base (\(NaOH\)), \(V_1 =25 ml\).

The concentration of the base (\(NaOH\)), \(M_1=0.5 M\).

The equivalence of the base (\(NaOH\)) is \(1\).

Hence, the normality of the base (\(NaOH\)), \(N_1=\frac{0.5}{1}N=0.5N\).

Given, the volume of the acid (\(HCl\)), \(V_2 =50 ml\).

Let us assume that the normality of the acid (\(HCl\)) \(N_2\).

Substitute the values in the given formula of titration.

\((25\times0.5)=(50 \times N_2)\\\Rightarrow 12.5=50N_2\\\Rightarrow N_2=\frac{12.5}{50} N\\\Rightarrow N_2=0.25 N\)

Hence, the normality of the acid (\(HCl\)), \(N_2=0.25 N\).

The equivalence of the acid (\(HCl\)) is \(1\).

Therefore, the concentration of the acid, \(M_1=\frac{0.25}{1}=0.25 M\).

Learn more about titration here: brainly.com/question/186765

Answer:

.2sb

Explanation:

according to my mind its the percentage of the question

Answer:

Pot holders are meant to protect your hand from the heat of the pot, and so it would need to be a poor conductor of heat in order to do its job correctly. Silicon dioxide is a solid at room temperature and methanol is a liquid.

The answer to the corn question is straightforward: Since maize was the most common grain in the state, most Kentucky distilleries probably used corn to produce their whiskey.

For instance, AOC laws guarantee that if you purchase a bottle of French wine labeled "Champagne," you will receive a sparkling wine made using the traditional method from the Champagne area using Chardonnay, Meunier, and/or Pinot Noir. In comparison to dry or medium (half-sweet) sherries, oloroso sherries are sweeter, more flavorful, and deeper in color. In the lack of flor, they deteriorate. Sherries that have been sweetened but not fermented are called cream sherries. Any state in the United States is eligible to produce bourbon, including Tennessee. However, before entering a new barrel for whiskey, the spirit must pass through a charcoal sugar maple filter.

To learn more about distilleries  here,

https://brainly.com/question/14474909

#SPJ4

The answer to the question depends on the specific solubility test being performed and the characteristics of the compound being tested.

option A or B.

The volume of solvent used in a solubility test may vary depending on the specific protocol or procedure being followed. However, a common guideline is to use a minimal amount of solvent that is just enough to dissolve the compound being tested.

Typically, a small amount (e.g., a few milligrams) of the compound is added to a test tube, and a small volume (e.g., 1-2 mL) of solvent is added. The mixture is then shaken or stirred to promote dissolution, and the result is observed (e.g., clear solution, precipitate formation, etc.).

Therefore, the answer to the question depends on the specific solubility test being performed and the characteristics of the compound being tested. A general guideline is to use a minimal amount of solvent, but the exact volume may vary depending on the specific circumstances.

Learn more about solubility test here: https://brainly.com/question/4519816

#SPJ1

Answer:

The answer to your question is given below

Explanation:

1. C. 2NaCl + I2 —> 2NaI + Cl2 => C. Single displacement.

From the above equation, we can see that I2 replaces Cl in NaCl to produce NaI. This is simply called a single displacement reaction.

2. E. 2C4H10 + 13O2 —> 8CO2 + 10H2O => E. Combustion.

The above equation shows the burning of Hydrocarbon in the presence of O2. This is simply called Combustion as CO2 and H2O is produced.

3. D 2H2O —> 2H2 + O2 => D. Decomposition.

From the above equation, we can see that a single compound H2O produces two elements H2 and O2. This is simply called a decomposition reaction.

4. A. ZnS + 2HCl —> ZnCl2 + H2S => A. Double Decomposition.

From the above equation, we can see that Cl replaces S in ZnS to produce ZnCl2 and S replaces Cl in HCl to produce H2S. This is simply called double displacement reaction.

5. B. H2 + Br2 —> 2HBr => B. Synthesis.

From the above equation, we can see that two element H2 and Br2 combine to produce a single compound HBr. This is simply called a synthesis reaction.

What happens to the energy produced by blocks of Earth's crust slipping past each other is it radiates outward in all directions. (Option C).

When blocks of the Earth's crust slip past each other during an earthquake, the energy that is released does not disappear, spread out randomly, or increase as it reaches the surface.

Instead, the energy radiates outward in the form of seismic waves. These seismic waves travel through the Earth in all directions from the point of the earthquake's origin causing the ground to shake.

The energy carried by these waves is what is felt as the shaking during an earthquake and can be detected and measured by seismometers.

Thus, what happens to the energy produced by blocks of Earth's crust slipping past each other is it radiates outward in all directions.

Learn more about earth's rotation here: https://brainly.com/question/1808956

#SPJ1

Answer:

23.3 grams

Explanation:

First we'll need the balanced equation for this equation.

2H₂ + O₂ → 2H₂O

This shows us that we need one mole of O₂ to produce two moles of water.

Now we need to convert grams to moles.

There is 18.01528 g for every mole of water

26.2/18.01528 = 1.454321

There 1.454321 moles of water produced

Remember that two moles of water are produced from a gram of O₂

1.454321/2 = 0.72716

0.72716 moles of O₂ were used

Now convert moles back to grams. There are 31.998 g for every mole of O₂

31.998 x 0.72716 = 23.2677

23.2677 grams of oxygen were used

The balanced equation for the reaction is BaCl2 + 2NaOH → Ba(OH)2 + 2NaCl

Based on the given information, we can calculate the amount of Ba(OH)2 obtained.

30 g BaCl2 × (1 mol BaCl2/208.23 g BaCl2) × (1 mol Ba(OH)2/1 mol BaCl2) × (137.3 g Ba(OH)2/1 mol Ba(OH)2) = 8.42 g Ba(OH)2

20 g NaOH × (1 mol NaOH/39.997 g NaOH) × (2 mol Ba(OH)2/2 mol NaOH) × (137.3 g Ba(OH)2/1 mol Ba(OH)2) = 17.48 g Ba(OH)2

Therefore, a total of 25.9 g of Ba(OH)2 is obtained during the reaction of 30 g of BaCl2 and 20 g of NaOH.

There is a surplus of NaOH, with a total of 2.5 g of NaOH remaining (20 g NaOH - 17.48 g Ba(OH)2 = 2.52 g NaOH).

What is balanced equation?

A balanced equation is an equation in which the number of atoms of each element on either side of the equation are equal. For example, the following equation is balanced: 2H2 + O2 → 2H2O

To learn more about balanced equation

Here: https://brainly.com/question/26694427

#SPJ1

Alkene is an unsaturated hydrocarbon which contain at least one carbon-carbon double bond. Here butene is an alkene with the chemical formula C₄H₈. The functional group present in alkenes is the double bond.

The structural isomers are those isomers in which the atoms are completely arranged in a different order but have the same molecular formulas. It is also called the constitutional isomers.

Geometric isomers are two or more compounds with the same number and types of atoms and bonds but have different geometries for the atoms.

To know more about Geometric isomers, visit;

https://brainly.com/question/28188244

#SPJ1

The most likely explanation for the given observations is that the crystals lose water when heated, resulting in a transition from crystals to a powdery substance and a decrease in mass after cooling. Option A

When certain substances contain water molecules as part of their crystal structure, heating them can cause the water molecules to evaporate, leading to the loss of water. This can result in a change in the physical properties of the substance, such as a transition from crystalline to powdery form.

The absence of condensation or other visible changes inside the test tube suggests that the substance is not reacting with the air or giving off a colorless gas. If such reactions were occurring, there would likely be observable changes or reactions taking place.

The decrease in mass after cooling can be attributed to the loss of water molecules. Water has mass, and when it evaporates, it escapes from the test tube, causing a reduction in the overall mass of the substance.

Option A

For more such questions on transition visit;

https://brainly.com/question/2879928

#SPJ8

Answer:

1) Ra

K

Na

Li

2) Na

Mg

Al and Si

Answer:

1st = saturated

Explanation:

Bro first ka answer saturated he

Taking into account the change of units, 21.8 in³ is equal to 0.357238 L.

The rule of three is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them.

If the relationship between the magnitudes is direct, that is, when one magnitude increases, so does the other (or when one magnitude decreases, so does the other) , the direct rule of three must be applied using the following formula, where a, b and c known data and x the variable to be calculated:

a ⇒ b

c ⇒ x

So: x= (c×b)÷ a

The direct rule of three is the rule applied in this case where there is a change of units.

To perform in this case the conversion of units, you must first know that 1 in³ = 0.0163871 L. So, the rule of three can be used as follow: if 1 in³ is 0.0163871 L, 21.8 in³ equals how many L?

1 in³ ⇒ 0.0163871 L

21.8 in³ ⇒ x

So: x= (21.8 in³ ×0.0163871 L)÷ 1 in³

Solving:

x= 0.357238 L

In summary, 21.8 in³ is equal to 0.357238 L.

Learn more with this example:

brainly.com/question/12482948

#SPJ1

While tumor marker test results can be useful, they are not conclusive. A low result does not imply that you do not have cancer or that you are in remission.

CA 15-3, for example, is raised in less than half of patients with early breast cancer and in more than 80% of those with metastatic breast cancer. Three tumor markers, cancer antigen 15-3 (CA 15-3), cancer antigen 27.29 (CA 27.29), and carcinoembryonic antigen (CEA), have been used in breast cancer care to help monitor metastatic breast cancer (advanced disease), but they have not been found to be useful in detecting a breast cancer recurrence or extending lives. If the level falls, the treatment is effective. If it rises, the cancer may be spreading.

Learn more about effective here-

https://brainly.com/question/27325201

#SPJ4

The number of moles of CO2 produced is 0.021 moles

If the estimated volume of the balloon is wrong then the amount of glucose reacted must be more than is stated.

The respiration equation represents the chemical process of aerobic cellular respiration, which occurs in the mitochondria of cells and is the primary way in which cells generate energy in the form of ATP (adenosine triphosphate).

The equation of the reaction is;

C6H12O6 + 6O2 → 6CO2 + 6H2O + ATP

We know that;

Number of moles of glucose = 10 g/180 g/mol

= 0.056 moles

PV = nRT

n = PV/RT

n = 1 * 0.55/318 * 0.082

n = 0.021

Learn more about glucose:https://brainly.com/question/2252123

#SPJ1

Answer:

4.2 mol NH3

Explanation:

First, balance your reaction.

N2 + 3H2 --> 2NH3

Multiply 6.3 mol H2 by the mole ratio of 2 mol NH3 for every 3 mol H2 to get moles of NH3 produced.

6.3 mol H2 • (2 mol NH3 / 3 mol H2) = 4.2 mol NH3

Answer:

Add to a 500mL volumetric flask 300mL of water, the 129mL of the 11.6M HCl solution and then complete to volume with water

Explanation:

To make 500mL = 0.500L of a 3M HCl from the 11.6M HCl stock we need first to find the moles of HCl we need:

Moles HCl:

0.500L * (3mol / L) = 1.5 moles of HCl are needed

These moles are obtained from the 11.6M HCl solution. The volume required is:

1.5mol * (1L / 11.6moles HCl) = 0.129L = 129mL must be added to the solution.

That means to prepare the 500mL of the 3M HCl you need to:

Add to a 500mL volumetric flask 300mL of water, the 129mL of the 11.6M HCl solution and then complete to volume with water

Answer:

Calculation: 11.6 M × V = 3.0 M × 0.500 liters

V = 0.13 liters

Steps for dilution:

Measure out 0.13 liters of the concentrated solution of 11.6 M HCl using a volumetric pipet.

Transfer this into solution into a 500 milliliter volumetric flask.

Add water to the flask until it reaches a total volume of 500 milliliters.

Solution: V = 0.13 liters

Explanation:

Answer:

Ca2+

Explanation:

don't really know what to explain here, thats just the ion name.

Answer:

1.45 x 10⁻² g CO₂

Explanation:

To find the mass of carbon dioxide, you need to (1) convert grams CH₄ to moles CH₄ (via molar mass), then (2) convert moles CH₄ to moles CO₂ (via mole-to-mole ratio from reaction coefficients), and then (3) convert moles CO₂ to grams CO₂ (via molar mass). The final answer should have 3 sig figs to reflect the given value (5.30 x 10⁻³ g).

Molar Mass (CH₄): 12.011 g/mol + 4(1.008 g/mol)

Molar Mass (CH₄): 16.043 g/mol

Combustion of Methane:

1 CH₄ + 2 O₂ ---> 2 H₂O + 1 CO₂

Molar Mass (CO₂): 12.011 g/mol + 2(15.998 g/mol)

Molar Mass (CO₂): 44.007 g/mol

5.30 x 10⁻³ g CH₄          1 mole              1 mole CO₂          44.007 g
---------------------------  x  ----------------  x  ---------------------  x  -----------------  =
                                      16.043 g            1 mole CH₄            1 mole

=  0.0145 g CO₂

=  1.45 x 10⁻² g CO₂

The number of mole of sulphur, S needed for the reaction is 0.39 mole

From the question given above, the following data were obtained:

Mole = mass / molar mass

Mole of Al = 56.4 / 27

Mole of Al = 2.09 mole

16Al + 3S₈ —> 8Al₂S₃

From the balanced equation above,

16 moles of Al required with 3 moles of S.

Therefore,

2.09 moles of Al will require = (2.09 × 3) / 16 = 0.39 mole of S

Thus, 0.39 mole of Sulphur, S is required for the reaction.

Learn more about stoichiometry:

https://brainly.com/question/14735801

Explanation:

The periodic table

Periodic Trends: Electron Affinity

-----

Chlorine is an element that is less electronegative than oxygen, but it has the highest electron affinity of any element.

Affinity can refer to the tendency of an atom to combine by chemical reaction with atoms or compounds or the electronic property by which dissimilar chemical species are capable of forming chemical compounds.

Answer: Cl and because of its highest electron affinity.

Answer:

Singlet oxygen

Explanation:

Singlet oxygen is more reactive than chlorine I believe. Chlorine is also a singlet which is why it readily attacks and bleaches organic compounds while atmospheric oxygen does not.

Have great day♡

From the calculations, the change in energy is - 190 J.

From the first law of thermodynamics, the energy is neither created nor destroyed but is transformed from one form to another.

From the law;

U = q + w

U = internal energy

q = heat

w = work

Since work is done on the surroundings and the gas absorbs heat then;

U = 132 J - 322 J

U = - 190 J

Learn more about thermodynamics:https://brainly.com/question/1368306

#SPJ1

Answer:

A state of balance in which the rates of the forward and reverse reactions are equal.

Explanation:

The dynamic equilibrium is a state of balance in which the rates of the forward and reverse reactions are equal, like we can see in the following drawing:

And the concentration of the reactants and products become stable in time.

Answer: A state of balance in which the rates of the forward and reverse reactions are equal.

Explanation:

chemical equilibrium is the state in which both the reactants and products are present in concentrations which have no further tendency to change with time.