The acid dissociation constant ka for hcn is approximately 1 × 10−9. what is the value of the pkb?

The exact amounts of HCOOH and HCOONa needed depend on the desired pH and the buffer capacity of the solution.

A buffer solution is prepared by mixing a weak acid (HCOOH) and its conjugate base (HCOONa).

To determine the specific amounts of each component needed, you should use the Henderson-Hasselbalch equation: pH = pKa + log ([A-]/[HA]), where [A-] is the concentration of the conjugate base (HCOONa) and [HA] is the concentration of the weak acid (HCOOH).

Knowing the desired pH and the pKa of formic acid (approximately 3.75), you can calculate the ratio of [A-] to [HA]. Then, adjust the concentrations accordingly to achieve a total volume of approximately 1 liter.

Summary: The required amounts of HCOOH and HCOONa to make a liter of buffer depend on the desired pH and buffer capacity. Utilize the Henderson-Hasselbalch equation to determine the correct ratio and concentrations of each component.

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Answer: to absorb light

Explanation:

Chlorophyll's job in a plant is to absorb light—usually sunlight. The energy absorbed from light is transferred to two kinds of energy-storing molecules. Through photosynthesis, the plant uses the stored energy to convert carbon dioxide (absorbed from the air) and water into glucose, a type of sugar.

Answer:

It helps in the synthesis of carbohydrates that serves as food for the entire plant by a process called PHOTOSYNTHESIS.

Explanation:

Chlorophyll's job in a plant is to absorb light i.e usually sunlight. The energy absorbed from light is transferred to two kinds of energy-storing molecules. Through photosynthesis, the plant uses the stored energy to convert carbon dioxide (absorbed from the air) and water into glucose i.e a type of sugar molecules need in plants.

Chlorophyll is found in virtually all photosynthetic organisms, including green plants, cyanobacteria, and algae.

Question:

What organelle is A and B pointing?

Answer:

A = Nucleus

B = Cell Membrane

Explanation:

As we can see A points at the centre of the plant cell. Which is a nucleus. And B points to the outer part of the plant cell. Which is a cell membrane.

Hopefully this answer will help you.

Answer:

Option D

Explanation:

Molarity (M) of any solution is equal to the number of moles (n)of solute in it divided by total volume of solution (V)

Mathematically, it can be represented as

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

Substituting the given values, we get-

\(M = \frac{10}{5} = 2\)

Hence, option D is correct

Answer: supercalifragilisticexpialidocuos

Explanation:

Option A. Biomass

Greenhouse gases are gases that contributes to the greenhouse effect through absorption of infrared.

This gases comes from substances such as petroleum, natural gas or even coal. Since Biomass can be used for generating electricity in a power plant, hence they release greenhouse gases when used to make electricity.

The milligrams of the gas are formed if 10.0ml of 3.00% hydrogen peroxide solution decomposes, The density of the solution is 1.00 g/mL is 300 mg.

The equation is as follows :

2H₂O₂(l)   ---->   2H₂O(l)   +   O₂(g)

The density of the solution = 1 g/mL

The volume of the water = 100 mL

The volume of the H₂O₂ = 10 mL

The mass of the hydrogen peroxide = 3 g

2 moles of the hydrogen peroxide produces the 1 mole of the oxygen gas.

The mass of the O₂ =   (10 mL × 3 g of H₂O₂ ) / 100 mL

                                = 0.3 g = 300 mg

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Answers

Explanations

Answer: The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles SO2, or 64.0638 grams.

Hope it helps.

Resonance structures show that chemical species have equal bond lengths and bond angles when in resonance. The bond lengths of the N - O bond in HNO2 is 126pm.

Linus Pauling introduced the idea of resonance to explain the nature of bonding in compounds and ions where a single Lewis structure can not satisfactorily account for the observed properties of the chemical species.

If the two structures are resonance structures, they will have equal N - O bond lengths and bond angles. The bond length will be intermediate between that of a pure N - O single and N - O double bond. The actual N- O bond lengths in HNO2 are obtained as;  136 pm -  122 pm/2 = 126 pm.

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In the separatory funnel, the top diethyl ether layer contains naphthalene, and the bottom aqueous layer contains water, sodium benzoate (converted from benzoic acid), and 2M sodium hydroxide.

An illustration of the location of each component in a separatory funnel containing water, diethyl ether, benzoic acid, naphthalene, and 2M sodium hydroxide is as follows :

1. The separatory funnel contains two immiscible layers due to the presence of water and diethyl ether. The top layer is the less dense diethyl ether layer, and the bottom layer is the more dense aqueous (water) layer.

2. Naphthalene, being nonpolar, will dissolve in the nonpolar diethyl ether layer. So, it will be located in the top layer.

3. Benzoic acid reacts with the 2M sodium hydroxide (a strong base) to form water-soluble sodium benzoate. The reaction can be represented as:
  C₆H₅COOH + NaOH → C₆H₅COONa + H₂O
  Therefore, benzoic acid (or its sodium salt, sodium benzoate) will be located in the bottom aqueous layer.

4. 2M sodium hydroxide, being a strong base, is completely ionized in water. So, it will be located in the bottom aqueous layer as well.

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Answer:

elllo

Explanation:

1.2 × 10²³ molecules are there in 24 grams of  FeF₃ molecule. 1 mole is equal to 6.023 × 10²³ particles.

A mole is a important unit of measurement that chemists use in calculation. 1 mole is exactly equal to the 6.023 × 10²³ particles.

The term mole is defined as the amount of substance containing 6.023 × 10²³ molecules.

First multiply the number of moles supplied by Avogadro's Number to detect how many molecules there are.

Moles are determined from the molecular weight.

For FeF₃ molecule,

55.8 + 3⋅19 = 116g/mole

24 gram /  116g/mole

= 0.207 moles of  FeF₃

= 0.207 moles × 6.023 × 10²³

= 1.2 × 10²³ molecules

Thus, in 24 grams of FeF₃ molecule 1.2 × 10²³ molecules are present.

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Here are some common methods to test nutrients in water: Nitrate, Phosphate, Ammonia, Chloride, and iron , and testing for nutrients in water is important because excessive levels of certain nutrients can lead to water pollution and harm aquatic life.

Nitrate is a common form of nitrogen found in water, and high levels can indicate pollution from agricultural or urban runoff. Phosphate is an important nutrient for plant growth, but excessive levels in water can lead to harmful algal blooms and oxygen depletion. The molybdenum blue method is a well-established method for testing for phosphate in water, and it is relatively sensitive and accurate.

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Answer:

2. Distillation Flask

3. Fractionating column

4. Thermometer

5. Condenser

6. cold water in

7. cold water out

8. Recieving flask

13. Electric heater

The nucleophilic substitution reaction, a nucleophile a species with a lone pair of electrons, such as anions or neutral molecules replaces a leaving group on a substrate. The stereochemistry of the products will depend on the specific mechanism of the reaction.

There are two main mechanisms for nucleophilic substitution the SN1 and SN2 mechanisms. In the SN1 mechanism, the leaving group first dissociates from the substrate to form a carbocation intermediate. Then, a nucleophile attacks the carbocation from either side to form a mixture of stereoisomers racemic mixture. In the SN2 mechanism, the nucleophile attacks the substrate while the leaving group is still attached, leading to a single stereoisomer product with an inversion of configuration at the stereocenter. To determine the mechanism and products of a specific reaction, we would need to know the substrate, nucleophile, and conditions of the reaction. Once we have that information, we can predict the mechanism and stereochemistry of the products based on our knowledge of nucleophilic substitution reactions.

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Answer:

No, changes in matter are physical changes.

Explanation:

Isotopes are atoms that belong to the same element: 11 protons, 10 neutrons, 11 electrons, 13 protons 14 neutrons, and 13 electrons

An isotope is one of two or more atom types of a chemical element that share the same atomic number, position on the periodic table, chemical behavior, and physical properties, but differ in atomic mass. One or more isotopes can be found in any chemical element. The number of protons in an atom's nucleus is the first criterion for determining its identity and labeling.

The observation that all atoms with the same atomic number have roughly the same chemical properties—if not exactly the same—gives this atomic number its significance. The symbol Z is typically used to represent this number. An ingot of pure uranium, for instance, only contains atomic number 92 atoms. Each atomic number has a place on the periodic table of elements, and each of these places is labeled with the element's common name, like calcium, radon, or uranium.

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The calcium ion has 18 protons, 20 neutrons, and 20 electrons.
The relationship between the components a and b is Inverse proportion.


The calcium ion (Ca2+) has a 2+ charge, indicating that it has lost 2 electrons from its neutral state. To determine the number of protons, neutrons, and electrons in the calcium ion, we need to consider its atomic number and mass.

The atomic number of calcium is 20, which indicates that it has 20 protons. Since the calcium ion has a 2+ charge, it means it has lost 2 electrons. Therefore, the number of electrons in the calcium ion is 20 - 2 = 18.

The mass number of calcium is 40 amu, which represents the total number of protons and neutrons. Since the calcium ion has 20 protons, the number of neutrons can be calculated as 40 - 20 = 20.

So, the correct option is: d. 18 protons, 20 neutrons, and 20 electrons

In the expression a∼1/b, the relationship between the components a and b is an inverse proportion. This means that as the value of a increases, the value of b decreases, and vice versa. The symbol ∼ represents the proportional relationship between a and 1/b, indicating that they are inversely related. Therefore, the correct answer is: Inverse proportion

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Answer:

Microwave or Radio waves

Explanation:

The information provided, if ΔE (change in internal energy) is positive and ΔH (change in enthalpy) is negative during a process carried out at constant pressure, the correct answer is: c) The system absorbs heat and contracts during the process.

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The reaction between 3-phenylpropyne and D2 (deuterium) in the presence of Pd/C (palladium on carbon) is a catalytic hydrogenation reaction. In this reaction, the triple bond of 3-phenylpropyne is reduced to a single bond, resulting in the addition of two deuterium atoms.

The organic product of this reaction is 3-phenylpropane-d2. The triple bond between the carbon atoms in 3-phenylpropyne is converted into a single bond, and two deuterium atoms (D) replace two hydrogen atoms (H). The phenyl group (C6H5) remains intact. The deuterium atoms are isotopes of hydrogen, containing a neutron in their nuclei. Thus, the resulting product, 3-phenylpropane-d2, contains deuterium atoms instead of hydrogen atoms, while the overall structure of the molecule remains the same.

Overall, the reaction between 3-phenylpropyne and D2 in the presence of Pd/C leads to the formation of 3-phenylpropane-d2, where the triple bond is converted to a single bond and two deuterium atoms replace two hydrogen atoms.

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Protons and neutrons contribute to the atomic mass of an element.

Electrons have a negligible mass compared to protons and neutrons.

The combined mass of protons and neutrons determines the atomic mass.

The correct answer is (d) protons and neutrons. The subatomic particles that contribute to the atomic mass of any given element are protons and neutrons. Protons have a positive charge, while neutrons are electrically neutral. Electrons, although important for determining the atom's charge and chemical behavior, have a negligible mass compared to protons and neutrons. Therefore, when calculating the atomic mass of an element, it is primarily determined by the combined mass of its protons and neutrons.

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Answer:

7

Explanation:

2.524g(5.1)(106)g

(6.85)(103)g

=

1364.4744g2

705.55g

=

1364.4744g

705.55

=

1364.4744g

705.55

=1.933916g

Answer:

2

Explanation:

YES

4.37 g/cm³ is the density of rhodium in grams per cubic centimeters.

What is the atomic weight of rhodium?

The atomic weight of rhodium is 102.9 g/mol. This means that one mole of rhodium atoms has a mass of 102.9 grams. Rhodium is a rare, silvery-white metal that is highly reflective and has a high melting and boiling point. It is often used in catalytic converters, electroplating, and jewelry. The atomic weight of rhodium is an important factor in determining its physical and chemical properties.

To calculate the density of rhodium, we need to divide its atomic weight by its volume. The volume of an fcc crystal can be found by using the formula:

V = a^3/2

where a is the atomic radius. Substituting the values, we get:

V = (0.1345 nm)^3/2 = 2.36 x 10⁻²³ cm³ .

Therefore, the density of rhodium is 102.9 g/mol / 2.36 x 10⁻²³ cm³ = 4.37 g/cm³.

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The energy is coming from the battery that is in the torchlight.

In the case of an object in motion, energy is coming from the kinetic energy of the object. Kinetic energy is the energy an object possesses due to its motion. This energy is transferred to the object by an external force, such as a push or a pull, which causes the object to start moving or to change its motion.

Energy is the ability to do work and can take many forms, such as thermal, kinetic, potential, and chemical energy. Energy can be transformed from one form to another and can also be transferred from one object to another.

Therefore, In the case of an object being put into motion, energy is coming from the potential energy of the object. Potential energy is the energy an object possesses due to its position or configuration. This energy is transferred to the object by an external force, such as gravity, which causes the object to start moving or to change its motion.

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Answer:

Explanation:

As organisms release energy during cellular respiration, carbon dioxide is produced from the carbon in energy storage molecules. ... Carbon dioxide in the biodome decreased because decomposers decreased which means there was a decrease in cellular respiration overall.