how many grams of iodine must be dissolved in 725 ml of carbon disulfide to produce a 0.236 m solution

This statement is true.

The dry adiabatic lapse rate is the average temperature dereses with heigh of 6.5 degree celsius.

What is adiabatic lapse?

The rate of decrease of temperature experienced by a parcel of air when it is lifted in the atmosphere under the restriction that it cannot exchange heat with its environment. For parcels that remain unsaturated during lifting, the (dry adiabatic) lapse rate is 9.8°C per kilometer.

it averages about 6.5 °C per kilometre (18.8 °F per mile) in the lower atmosphere (troposphere). It differs from the adiabatic lapse rate, which involves temperature changes due to the rising.

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Answer: C. Na2B4O7•10H2O

Explanation:

Hope this helps :)

The formula is tetrasodium borate-Na2B4O7.10H2O

Given- 0.0132 mol Na2B4O7 and 0.1311 mol H2O

Using the molar mass of the anhydrous Na2B4O7 and its mass percentage, we can calculate the molar mass of the hydrate (if we look at it as 100% of the mass) by stoichiometry.

Molar mass of Na = (22.990 g/mol)

Molar mass of B = (10.811 g/mol)

Molar mass of O = (15.999 g/mol)

Molar mass of Na2B4O7= 2⋅22.990 g/mol +4⋅10.811 g/mol +7⋅15.999 g/mol = 201.217 g/mol

201.217g/mol : 52.8%=x g/mol : 100%

​x g/mol = 201.217 g/mol⋅100%÷52.8 %

x g/mol= 381.093 g/mol

In 381.093 g of hydrate, we have 201.217 g of anhydrous Na2B4O7 , the rest of the mass is water.

381.093g−201.217g= 179.876 g of water

Molar mass of H = 1.008 g/mol

Molar mass of O = 15.999 g/mol

Molar mass of  H2O= 1.008 g/mol+ 15.999g/mol  = 18.015 g/mol

179.876g ÷18.015 = 9.98= 10 moles of water per mole of hydrate.

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If salt A has a greater solubility in water than salt B we can say that the Ksp value of salt A is greater than the Ksp value of salt B.

Solubility product constant (Ksp) is a measure of the solubility of an ionic compound in water. The Ksp value is dependent on the nature of the compound and the conditions under which it is dissolved. A higher Ksp value indicates that the compound is more soluble in water.

If salt A has a greater solubility in water than salt B, it means that salt A has a higher concentration of dissolved ions in water compared to salt B. This implies that the Ksp value of salt A is greater than the Ksp value of salt B, as a higher concentration of ions in solution requires a higher Ksp value to maintain equilibrium.

Therefore, we can conclude that the solubility of salt A is greater than salt B, and that the Ksp value of salt A is greater than the Ksp value of salt B.f f s

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Answer:

this is a required answer. look it once.

Answer:Ocean currents act much like a conveyor belt, transporting warm water and precipitation from the equator toward the poles and cold water from the poles back to the tropics.

Explanation:

Answer:

Explanation:

Ocean currents act much like a conveyor belt, transporting warm water and precipitation from the equator toward the poles and cold water from the poles back to the tropics. 

hope it helps!

The layer in the ocean that is characterized by a rapid temperature change and marks the transition between the warm surface layer and the deep zone of cold water is known as the thermocline.

The ocean is divided into different layers based on temperature and salinity. The thermocline is a layer where the temperature changes rapidly with depth. This layer separates the warmer, mixed surface layer from the colder, deep ocean water.

The pycnocline is a layer where the water density changes rapidly with depth, often due to changes in temperature (thermocline) and/or salinity (halocline). The thermohalocline is not a commonly used term and appears to be a combination of the words thermocline and halocline.
In summary, the term you are looking for to describe the layer with rapid temperature change between the warm surface layer and the deep zone of cold water in the ocean is the thermocline.

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Each illustration shows a practical application of magnets to a problem.

They support documents on a refrigerator.

They are employed to seal the freezer's door and lid.

From a combination, they can remove magnetic objects.

With a magnet, all of the issues on the list can be resolved. We can use a magnet on the refrigerator to display a photo or holiday card. When the magnets inside the freezer are close to one another and are attracted to one another, the door is sealed shut and keeps our food cold. If metallic objects are present in a mixture, the magnet can be used to separate those items based on their magnetic characteristics. These are straightforward issues with a straightforward resolution: magnets!

Students are introduced to the main steps in the engineering design process during the presentation. They then read through a scenario in which middle school student Marisol struggles to keep their locker organized in discussion groups.

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Yes, the reaction between methanol and oxygen to give formic acid and water is a redox reaction.

Redox reaction is an abbreviation for "reduction-oxidation" reaction. In a redox reaction, there is a transfer of electrons from one molecule to another molecule. The oxidation state of the reactants and products will change. Methanol is a reducing agent and oxygen is an oxidizing agent. Methanol reduces oxygen, and oxygen oxidizes methanol.

The reaction between methanol and oxygen to give formic acid and water is a redox reaction. In this reaction, methanol is oxidized to form formic acid, while oxygen is reduced to form water. The oxidation state of carbon in methanol goes from -2 in methanol to +2 in formic acid, indicating that it has been oxidized. The oxidation state of oxygen in oxygen goes from 0 to -2 in water, indicating that it has been reduced.

Therefore, this reaction involves both oxidation and reduction and is a redox reaction.

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Answer:

the tendency toward a relatively stable equilibrium between interdependent elements, especially as maintained by physiological processes.

Explanation:

Answer:

a. triple bond

b.diatomic atom

c. covalent bond

d. non polar covalent bond

e. covalent bond

f. sigma bonds

Answer:

divergence of continental crust

Explanation:

In chemical communication between cells, a secretory cell secretes a chemical messenger that binds to receptors on the target cell.

Cells are the basic building blocks of all living things. The human body is made up of trillions of cells. They give structure to the body, absorb nutrients from food, convert those nutrients into energy, and perform specific functions. In multicellular organisms, such as higher plants and animals, specialized cell groups are organized into tissues and organs.

Cells can be used as the basis for describing organisms as unicellular or multicellular. Unicellular organisms are organisms that have only one cell, i.e. single-celled organisms. Prokaryotes and protists are examples. Multicellular organisms are organisms with more than one cell. Examples are plants and animals.

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Tritiated hydrogen (3H) differs from hydrogen (1H) in that -3H has 2 more neutrons than 1H.

Tritiated hydrogen (3H) is a radioactive isotope of hydrogen that contains two additional neutrons compared to the stable isotope of hydrogen, which is hydrogen-1 (1H). The atomic nucleus of hydrogen-1 consists of a single proton and no neutrons, while tritiated hydrogen (3H) has one proton and two neutrons in its nucleus.

The addition of two neutrons in tritiated hydrogen (3H) increases its atomic mass, making it heavier than hydrogen-1 (1H). The presence of extra neutrons also affects the stability and radioactive properties of tritiated hydrogen. The unstable nature of 3H leads to its radioactive decay over time, emitting beta particles in the process.

Due to its radioactive nature, tritiated.

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The solute wether electrolyte or a nonelectrolyte, has the greater effect on the boiling point when a given amount of each solute is dissolved in the same mass of water The nonelectrolyte does because it dissociates into ions.

Solute refers to substances or liquid which can readily dissolve in a solvent. It's concentration is lower to that of solvent.

Therefore, The solute wether electrolyte or a nonelectrolyte, has the greater effect on the boiling point when a given amount of each solute is dissolved in the same mass of water The nonelectrolyte does because it dissociates into ions

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Answer:

D: The electrolyte does because it dissociates into ions.

Explanation:

First, we have to calculate the molecular weights of each molecule:

Then, we have to calculate the number of grams of water. We can calculate them because the process of evaporation lets us know the water amount that was retired:

Then, we're gonna convert the grams of sodium carbonate alone (30.2 g) and the grams of water to moles:

It means that the mole relation is 1:1 approx, as it is the same amount for both. Then, the formula is going to be:

It means that the answer is A.

Answer:

Calcium is a chemical element with the symbol Ca and atomic number 20. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air.

Explanation:

Answer:

31.36 Liters

Explanation:

1 mole is equal to 22.4 liters at STP so you can use the equation

1.4 moles * 22.4 liters

to find the volume.

Answer:

Mass = 917.4 g

Explanation:

Given data:

Number of molecules = 3.00 ×10²⁴ molecules

Mass in gram = ?

Solution:

1 mole contain 6.022 × 10²³ molecules

3.00 ×10²⁴ molecules × 1 mol /  6.022 × 10²³ molecules

0.5×10¹ mol

5 mol

Mass in gram:

Mass = number of moles  × molar mass

Mass = 5 mol  × 183.48 g/mol

Mass = 917.4 g

ANSWER

Option C

EXPLANATION

Given that;

In the reaction above, we have the following data

At the reactants side;

3 atoms of manganese

4 atoms of nitrogen

1 atom of sodium

1 atom of fluorine

At the products side

1 atom of manganese

4 atoms of fluorine

3 atoms of sodium

1 atom of nitrogen

To balance the above equation, apply the law of conservation mass

Law of conservation of mass states that matter can neither be created nor destroyed but can e transformed from one formato another.

To balance the equation, 1 mole of Mn3N4 reacts with 12 moles of Na Tto give 3 moles of MnF4 and 4 moles of Na3N

So, the new equation becomes

The following data can be deduced in the above equation

At the reactants side

3 atoms of Mn

4 atoms of N

12 atoms of Na

12 atoms of F

At the products side

3 atoms of Mn

12 atoms of F

12 atoms of Na

4 atoms of N

Looking atthe vabove data, the number of atoms of each element at the reactants side is equal to the number of atoms of same elements at the products side.

Hence, the correct answer is option Ce

u

There are a few methods that can be used to determine the volume of hydrogen produced during the electrolysis of sodium chloride. Here is one method:

1. Set up the electrolysis cell with the sodium chloride solution as the electrolyte and the electrodes in place. Make sure the cell is sealed and that the hydrogen and oxygen produced during the reaction can be collected.

2. Turn on the power supply and start the electrolysis reaction. Make sure to monitor the reaction and record any relevant data, such as current, voltage, and time.

3. When the reaction is complete, turn off the power supply and carefully remove the hydrogen and oxygen gas collectors from the cell.

4. Measure the volume of the hydrogen gas collected using a gas displacement method. This can be done by measuring the volume of water displaced by the gas in a graduated cylinder or by using a gas pressure gauge to measure the pressure of the gas and converting the pressure to volume using the ideal gas law.

5. Calculate the volume of hydrogen produced by subtracting the volume of oxygen produced from the total volume of gas produced. This value represents the volume of hydrogen produced during the electrolysis reaction.

6. If desired, the mass of the hydrogen produced can be calculated by multiplying the volume of hydrogen by its density. The density of hydrogen gas at standard temperature and pressure (STP) is 0.08988 g/L.

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I would first gather the required materials before using the appropriate method to analyse the volume of hydrogen generated during the electrolysis of sodium chloride.

This would consist of a gas syringe, electrodes, a power source, a beaker, and a sodium chloride solution. I would then get started on the solution. To make the necessary amount of sodium chloride, I would measure it out and mix it with distilled water.

After that, I would add the solution to the beaker. I would then prepare the experiment. The electrodes would be connected to the power source, and then placed inside the beaker. The power supply would then be turned on, and I would wait for the electrolysis to begin.

To collect the generated gas, I would use the gas syringe. I would keep track of the amount of gas created before figuring out the amount of hydrogen produced. I would be able to precisely gauge the volume of hydrogen generated during the electrolysis of sodium chloride using this technique.

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The concept that each one matter is made up of tiny units called atoms was first proposed by Leucippus and Democritus, within the fifth century B.C. Dalton , in 1808 postulated that matter is formed of atoms, which are small indivisible particles

The atomic theory of matter was first proposed by Dalton in 1808. Dalton atomic theory regarded the atom because the ultimate particle of matter.

In 1898, J.J Thomson, proposed that an atom possess a spherical shape during which positive charge is distributed uniformly and the electrons are embedded into it. So his model is named plum pudding model

Rutherford established his model in 1900. He found that, most space of an atom is empty and charged particle concentrated at the center of an atom called nucleus.

In 1913, Neils Bohr improved the model proposed by Rutherford. consistent with his concept electrons orbit the nucleus.

Erwin Schrödinger, in 1926 proposed electron cloud model. He explains the probability of finding electrons.

Hence, we will conclude that the order the sequence of ideas that led to the current model of the atom is,

1. Dalton developed the idea that all matter is made of atoms.

2. Thomson discovered that atoms contain electrons.

3. Rutherford discovered that atoms have a nucleus.

4. Bohr developed the model during which electrons orbit the nucleus.

5. Schrödinger developed the electron cloud model of the atom.

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Answer:

B. Granite

Explanation:

The continental crust is thicker, 30 km (20 mi) to 50 km (30 mi) thick. It is mostly made of less dense, more felsic rocks, such as granite.

The correct sequence during aerobic respiration in which electrons travel downhill is (b) food → NADH → electron transport chain → oxygen.

Aerobic respiration is a process by which cells convert food molecules into usable energy in the presence of oxygen. During this process, electrons are passed from one molecule to another, creating a flow of energy that is ultimately used to produce ATP, the main energy currency of the cell. When food is broken down in the first step of respiration, it is converted into a molecule called NADH. This molecule then donates electrons to the electron transport chain, which is a series of proteins located in the inner mitochondrial membrane. As the electrons pass through the chain, energy is released and used to create a proton gradient. This gradient is then used by an enzyme called ATP synthase to produce ATP. Finally, the electrons are passed to oxygen, which serves as the final electron acceptor and is ultimately reduced to water.

In summary, during aerobic respiration, electrons travel from food to NADH to the electron transport chain to oxygen. This process creates a flow of energy that is used to produce ATP and ultimately enables cells to carry out their functions.

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The food sample contained starch and reducing sugar (carbohydrates).

The Benedict's test is used to test for the presence of reducing sugars, such as glucose, in a sample. When the Benedict's solution is added to a sample containing reducing sugars and heated, the solution will turn brick red.

The iodine test is used to test for the presence of starch in a sample. When iodine solution is added to a sample containing starch, it will turn blue-black.

So, in this case, the student can conclude that the food sample contained both starch and reducing sugars, as both tests produced positive results.

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Answer:

pH = 5.9

Explanation:

The equation to find pH is as follows:

pH = -log[H+]

We are not given [H+] so we have to find it given the value of [OH-].

To find [H+] from [OH-], use this equation:

\([H^{+} ]=\frac{1.0*10^{-14} }{[OH^{-}] }\)

Plug in [OH-] and solve for [H+]:

\([H^{+} ]=\frac{1.0*10^{-14} }{7.1*10^{-9} }\)

[H+] = \(1.41 * 10^{-6}\)

Now that we have found [H+] plug it into the pH equation and solve:

\(pH =-log(1.41*10^{-6} )\)

pH = 5.9

So, the pH of the solution would be 5.9

Hope this helps!! Ask questions if you need!

Answer:

5.0 °C

Explanation:

To find the temperature change, you need to use the following equation:

Q = mcΔT

In this equation,

-----> Q = heat energy (J)

-----> m = mass (g)

-----> c = specific heat capacity (J/g°C)

-----> ΔT = temperature change (°C)

You can find the temperature change by plugging the given values into the equation and simplifying.

Q = 209 J                      c = 4.18 J/g°C

m = 10.0 g                     ΔT = ? °C

Q = mcΔT                                                      <----- Equation

209 J = (10.0 g)(4.18 J/g°C)ΔT                     <----- Insert values

209 J = (41.8)ΔT                                           <----- Multiply 10.0 and 4.18

5.0 = ΔT                                                       <----- Divide both sides by 41.8

Answer:

5° C  temp change

Explanation:

Q = m c T  

       Given:  Q =209    m = 10    c = 4.18     looking for T (change in temp)

209 = 10 * 4.18 T

T = 209 / (10*4.18) = 5° C

Answer: a computer

Explanation:

The empirical formula of silicon hydride is SiH₄.

Silicon hydride, also known as monosilane, is a colorless gas that is flammable and explosive in its pure form. The empirical formula for silicon hydride is SiH₄.

Empirical Formula-

The empirical formula is the smallest whole number ratio of atoms in a compound.

To find the empirical formula of silicon hydride, you must first determine the number of atoms of each element in the compound. Silicon has an atomic number of 14, while hydrogen has an atomic number of 1. The compound is composed of one silicon atom and four hydrogen atoms.

Therefore, the molecular formula of silicon hydride is SiH₄.

The ratio of silicon to hydrogen atoms is 1:4, which is the simplest possible ratio.

The empirical formula of silicon hydride is SiH₄, which reflects the ratio of the number of atoms of each element in the compound.

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The scientific statement is

D. There is life on some other planet in the universe aside from Earth.

A scientific statement is a statement that is based on empirical evidence, logical reasoning, and the scientific method. It is a claim or proposition that can be tested, observed, or measured, and is subject to scrutiny and verification.

Scientific statements are characterized by objectivity, reliance on evidence, and the potential for falsifiability or validation through experiments or further investigation. these statements aim to describe, explain, or predict phenomena in the natural world and are an essential part of scientific inquiry and the advancement of knowledge.

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complete question

Which sentence is a scientific statement?

A.

Food cooked in ceramic pots has a better aroma than food cooked in copper pots.

B.

A tall glass of water tastes better with a lemon wedge and ice cubes.

C.

Today, there are more viewers watching baseball than ice hockey on television.

D.

There is life on some other planet in the universe aside from Earth

The signs of ΔH and ΔS are related to the sign of ΔG, and an understanding of the sign of ΔG can provide information about the nature of the reaction and the effect of temperature on the thermodynamic parameters.

However, in general, the sign of ΔG (Gibbs free energy change) can provide information about the signs of ΔH and ΔS. The relationship between these three thermodynamic parameters is given by the following equation:

ΔG = ΔH - TΔS

where T is the temperature in Kelvin.

If ΔG is negative, then the reaction is spontaneous and the forward reaction is favored. This implies that the products have a lower free energy than the reactants. In this case, if the temperature is increased, the value of TΔS will become more positive, which means that the value of ΔH must become more negative in order for ΔG to remain negative.

This suggests that the reaction is exothermic (ΔH is negative) and that the entropy change is negative (ΔS is negative).

If ΔG is positive, then the reverse reaction is favored and the products have a higher free energy than the reactants. In this case, if the temperature is increased, the value of TΔS will become more negative, which means that the value of ΔH must become more positive in order for ΔG to remain positive. This suggests that the reaction is endothermic (ΔH is positive) and that the entropy change is positive (ΔS is positive).

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