a 20.0-ml sample of 0.50 m h2c6h6o6 (ascorbic acid, a diprotic acid) was titrated with 0.50 m naoh. the following data were gathered during the titration. ml naoh added 10.00 20.00 30.00 40.00 ph 4.17 5.21 11.55 12.89 what is ka2 for ascorbic acid?

We can use the ideal gas law to find out the pressure of the gas.

★ PV = nRT

★P = nRT/V

Where P is the pressure in atm, V is the volume in liters, n is the number of moles, R is the ideal gas constant (0.0821 L atm/mol K), and T is the temperature in Kelvin.

We are given-

On substituting the values -

→ P = ( 6 × 0.0821×366.5)/41.7

→ P = 180.54/41.7

→ P =4.33 atm

→ P = 4.33×101.3 KPa

→P = 438.629 KPa

Henceforth, the pressure of the gas is 438.629 KPa.

The need for raw materials for industrial production was indeed a main economic cause of the new imperialism of the 19th century. The Industrial Revolution, which took place in the 18th and 19th centuries, brought about significant advancements in manufacturing, technology, and transportation. These advancements increased the demand for raw materials, such as minerals, metals, and agricultural products, to fuel industrial production.

As industrialized nations experienced rapid economic growth and sought to expand their industries, they required access to abundant and diverse sources of raw materials. The existing domestic supplies were often insufficient to meet the growing demands, leading these nations to turn their attention to colonies and territories abroad. Imperial powers embarked on a quest to acquire colonies that possessed valuable resources that could be exploited for their own economic benefit.

For example, European powers sought colonies in Africa to gain control over rich mineral deposits like gold, diamonds, and copper. Similarly, they targeted regions like Southeast Asia for their valuable spice trade and plantations producing rubber, tea, coffee, and other cash crops. These raw materials were vital for sustaining and expanding industrial production back in the imperial powers' homelands.

The acquisition of colonies and the establishment of economic dominance over these regions ensured a steady supply of raw materials, enabling industrialized nations to maintain their economic growth and competitive advantage. The new imperialism of the 19th century, driven by the economic need for raw materials, played a crucial role in shaping global power dynamics and economic relationships during that era.

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Answer:

balancing of charges of both sides

Answer:

A

Explanation:

A...............................

Explanation:

0 10 grams that that should be the answer

Answer:

Ecosystem Energy Flow Nearly all of the energy that drives ecosystems ultimately comes from the sun. Solar energy, which is an abiotic factor, by the way, enters the ecosystem through the process of photosynthesis. You can learn more than you want to know about this process in the unit on photosynthesis.

Explanation:

Answer:

Moving water

Explanation:

Answer:

moving water is the answer

Explanation:

:)

The incorrect statement will be; When possible use radioactive substances with half-lives is less than 120 days, when it comes to minimizing the hazardous waste. Option A is correct.

The recommended approach for minimizing hazardous waste is to use radioactive substances with shorter half-lives, which will result in less long-term radioactive waste. The half-life of a substance is the time it takes for half of the material to decay radioactively, and substances with shorter half-lives decay more rapidly, producing less waste over time.

Out of the given options, the best approach is to use radioactive substances with half-lives less than 60 days, as this will result in the least amount of long-term radioactive waste. Option B is incorrect. When it comes to minimizing hazardous waste, it is preferable to use radioactive substances with shorter half-lives.

This is because shorter half-lives result in less radioactive waste being generated over time. Therefore, the correct statement is "When possible use radioactive substances with half-lives is less than 40 days."

Hence, A. is the correct option.

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--The given question is incomplete, the complete question is

"Which of the following statements below is incorrect when it comes to minimizing hazardous waste? A)When possible use radioactive substances with half-lives less than 120 days B) When possible use radioactive substances with half-lives less than 40 days C) When possible use radioactive substances with half-lives less than 60 days D) When possible use radioactive substances with half-lives less than 30 days."--

Answer:

They are electrical conductors because their delocalised electrons carry electrical charge through the metal.

Explanation:

for the second ques

not sure...

the alkali metals react with water produced hydrogen gas and the metal hydroxide

2Na(s) + 2H₂O(l) → 2NaOH(aq) + H₂(g)

NaOH : strong base, pH> 7

so the pH of the solution could be 14

A dry cell typically contains solid zinc and solid carbon (as graphite) as the anode and cathode, respectively. The electrolyte is usually a paste or gel containing ammonium chloride and/or zinc chloride.

The chemical reaction between the zinc and electrolyte generates a flow of electrons that can be used to power a device. This type of cell is commonly used in small electronic devices such as flashlights, portable radios, and toys. It is important to note that a dry cell is different from a wet cell, which contains a liquid electrolyte. Dry cells are preferred in many applications because they are more portable, have a longer shelf life, and are less likely to leak.

A dry cell typically contains which of the following? The correct answer is: solid Zn and solid C (as graphite).

A dry cell, commonly used in batteries, has a zinc anode and a graphite cathode, which is a form of carbon. The zinc provides a source of Zn2+ ions, and the graphite cathode conducts electricity. The electrolyte in a dry cell usually consists of a paste containing a mixture of chemicals, such as ammonium chloride or zinc chloride. This paste allows ions to flow between the electrodes, enabling the electrochemical reactions necessary for the cell to generate electrical energy.

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Answer:

Digestive

Explanation:

Answer:

Putting fire below them

Explanation:

Fire is a method used for burning stuff faster as the heat transforms into energy

Answer:

weak ion attractions in the table salt

Answer:

See explanation

Explanation:

Intermolecular forces are forces of attraction that exist between molecules of a substance in a particular state of matter.

The dominant intermolecular force of attraction in H2O is the hydrogen bond. The hydrogen bond exists between molecules of a substance when the substance is made of hydrogen atoms bonded to atoms of a highly electronegative element. Hence, strong hydrogen bonding accounts for the high boiling point of water.

The magnitude of hydrogen bonding between molecules depends on the electro negativity of the atoms to which hydrogen is bonded.

The more the electro negativity of the atoms to which hydrogen is bonded, the greater the magnitude of intermolecular hydrogen bonding.

Since the electro negativity of elements decrease down the group, the strength of intermolecular hydrogen bonding between the molecules decreases as follows;

H2O> H2S> H2Se> H2Te

Answer: ???

Explanation:???

Considering the definition of Avogadro's Number, 7.37×10²² moles of Cu are in a 3.56g sample of Cu?

The molar mass of substance is the amount of mass that a substance contains in one mole.

Avogadro's Number is the number of particles that make up a substance (usually atoms or molecules) in the amount of one mole of the substance. Its value is 6.023×10²³ particles per mole.

Avogadro's number applies to any substance.

The molar mass of Cu is 63.54 g/mole. The amount of moles of Cu can be calculated as:

amount of moles= 3.56 g÷ 63.54 g/mole

amount of moles= 0.056 moles

Now you can apply the following rule of three: 1 mole of the compound has 6.023×10²³ atoms, 0.056 mole contains how many atoms?

amount of atoms of Cu= (0.056 moles ×6.023×10²³ atoms)÷ 1

amount of atoms of Cu= 7.37×10²²

Finally, 7.37×10²² moles of Cu are present.

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Answer:

\(\huge\boxed{\sf 5\ moles\ of\ oxygen}\)

Explanation:

\(C_3H_8+5O_2 \longrightarrow 4H_2O+3CO_2\)

From the reaction, we can say that,

So, to generate 3 mole of carbon dioxide, 5 moles of oxygen are required. (as shown in the chemical reaction!)

\(\rule[225]{225}{2}\)

The equilibrium constant of the reaction from the calculation that has been done is 0.154

The concentrations (or partial pressures) of reactants and products in chemical equilibrium for a specific chemical reaction are related by the equilibrium constant (K), a mathematical equation. It quantifies the degree to which an equilibrium has been reached in a reaction.

We have the equation of the reaction as;

A(g) + B(g) ⇔C(g)

Thus;

Keq = 45.83/11.23 * 26.50

Keq = 0.154

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Answer:

weathering

Explanation:

the rocks due to rain generate cracks . heat and wind helps the rock to break into smaller chunks .

this process continuous till the rock is converted into sand. and is called weathering

Answer: C

Explanation:

I know because i did it.

If the experiment was conducted at 25 degrees Celsius and the student measures that the overall pressure within the graduated cylinder is 0.93 atm, the pressure of hydrogen gas is 0.8987 atm.

To calculate the pressure of hydrogen gas, we need to use the ideal gas law:

PV = nRT, where: P = pressure, V = volume, n = number of moles, R = gas constant, T = temperature

In this case, we know the total pressure (P_total) inside the graduated cylinder, which is equal to the sum of the partial pressures of hydrogen gas (P_H2) and water vapor (P_water):

P_total = P_H2 + P_water

The vapor pressure of water at 25°C is 23.76 mmHg, which is equivalent to 0.0313 atm. Therefore, we can calculate the partial pressure of hydrogen gas:

P_H2 = P_total - P_water

= 0.93 atm - 0.0313 atm

= 0.8987 atm

So the pressure of hydrogen gas is 0.8987 atm.

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Answer:Conservation laws are fundamental to our understanding of the physical world in that they describe which processes can or cannot occur in nature.

Explanation: An important function of conservation laws is that they make it possible to predict the macroscopic behaviour of a system without having to consider the microscopic details of the course of a physical process or chemical reaction.

Answer:

8 lithium atoms and 4 oxygen atoms

Answer:

A lightning

Explanation:

Atomic mass calculated as the sum of protons and neutrons, it is measured in amu. This is because protons and neutrons each have a mass of 1 amu.

The sum of the masses of the protons, neutrons, and electrons in an atom or collection of atoms is known as the atomic mass. Since electrons are far lighter than protons or neutrons, the computation does not take their mass into account. A single atom's atomic mass is only its total mass, and it is usually given in atomic mass units, or amu.

Atomic mass = total number of protons present in the nucleus + total number of neutrons present in the nucleus of an atom

For elements having isotopes relative atomic masses are taken in consideration. The relative atomic mass is an average of the atomic masses of all the different isotopes.

Example- The atomic mass of carbon atom -  with six neutrons and 6 protons the atomic mass is 12 amu.

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From strongest to weakest bond strength: left to right:- Mg^2+ O^2 > Ca^2+ O^2- > Ca^2+ Se^2- >Li F^- > Na^+ F^- > Na^+ Br^- due to short Ionic Bond strength.

Bond energy, also known as mean bond enthalpy as well as average bond enthalpy, is a measure of the strength of a chemical bond. In chemistry, bond strength has been defined as the strength that a chemical bond contains two atoms together. This one is usually expressed in kilocalories per mole as the amount of energy needed to break the bond.

Due to the electrostatic attraction among its negative and positive ions, an ionic compound is stable. The lattice energy of an ionic bond is the amount of energy required to separate one mole of the a compound into its gas phase ions. Ions to higher charges as well as shorter distances between them have higher lattice energy.

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Answer:

20.(45)L or about 20.4545L

Explanation:

PV = nRT

Where:

P - pressure

V - volume

n - number of particle moles

R - a constant

T - temperature in K

We can assume the P and n (and definitely R) stay the same, so we infer that

\(V_1 = \frac{nRT_1}{P} = 15L\\V_2 = \frac{nRT_2}{P}\\V_1 / V_2 = \frac{nRT_1}{P} / \frac{nRT_2}{P} = \frac{T_1}{T_2}\\\\15L / V_2 = \frac{330K}{450K} = \frac{11}{15}\\\\V_2 = 15L \cdot \frac{15}{11} = 20.(45)L\)

Answer:

Gas exchange takes place in the millions of alveoli in the lungs.

Explanation:

Gas exchange takes place in the millions of alveoli in the lungs and the capillaries that envelop them. As shown below, inhaled oxygen moves from the alveoli to the blood in the capillaries, and carbon dioxide moves from the blood in the capillaries to the air in the alveoli.

The name for KHSO₃ is D) potassium bisulfite.

The elements potassium (K), hydrogen (H), sulphur (S), and oxygen (O) make up the chemical compound KHSO₃. One potassium ion (K+) and one hydrogen sulfite ion (HSO3-) are represented by its chemical formula.

This compound's naming follows inorganic chemistry norms. The term "bisulfite" in the compound's name denotes the existence of the hydrogen sulfite ion, while the prefix "potassium" denotes the presence of the potassium ion.

The name's prefix "bi-" denotes the presence of two hydrogen atoms bound to the sulfite ion in the molecule. One Sulphur atom, three oxygen atoms, and one hydrogen ion combine to form the sulfite ion, which has a -1 charge.

Potassium bisulfite is the proper name for KHSO₃ since it appropriately describes the ion makeup and charge of the molecule.

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