What is not a postulate of kinetic-molecular theory Gas particles take up volume Gas particles take up volume Gases move in straight lines Gases move in straight lines Temperature is a measure of the average kinetic energy Temperature is a measure of the average kinetic energy There are no forces of attraction between gas particles

Answer: The first question is chemical The second one is Physical

Explanation:

The types of atoms stay the same in chemical reactions but not in nuclear reactions. The correct option is C.

In chemical reactions, atoms remain the same at the end of every reaction. Although the bonds between atoms may change.

In nuclear reactions, atoms fuse with other atoms to form new atoms entirely. This is otherwise known as nuclear fusion.

Another type of nuclear reaction is nuclear fission. A single atom decomposes to form 2 or more different atoms entirely.

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Answer:

C) types of atoms

Explanation:

i just took the test

To make a water insoluble substance water soluble, a chemist can add groups with bonds between atoms with different attraction for electrons.

A water soluble drug or substance is easier to be taken up in your digestive system.

Positive and negative are attracted which makes a cohesive structure. When polar compounds or ions gets added to the water, these compounds breaks down or degrades into smaller components. They also might dissolve to become the part of the solution.

The partial charges of water attracts the various parts of a compound. When attraction occurs, it gets more soluble in the water.

Thus, by adding groups with bonds between atoms with different attraction for electrons, substance can become water soluble.

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The question pertains to the chemical behavior of the alkaline earth metals and whether they tend to gain or lose electrons in chemical reactions.

The alkaline earth metals are a group of elements in the periodic table that include beryllium, magnesium, calcium, strontium, barium, and radium. These elements are highly reactive due to their tendency to lose two electrons and form a +2 cation. This is because they have two valence electrons in their outermost shell, and losing these electrons allows them to achieve a stable electron configuration. The tendency to lose electrons is due to their low ionization energy, which is the energy required to remove an electron from an atom or ion

. The alkaline earth metals are important elements in many areas of chemistry, including materials science, biochemistry, and environmental chemistry. Understanding their chemical behavior is important in predicting their reactivity and properties, as well as their potential applications in various fields.

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The overall dipole moment of the water molecule is shown in the image attached.

We know that there is a dipole that exists in a molecule when there is an electronegativity difference between the atoms that are in the molecule. In the case of the water molecule, there is an electronegativity difference that exists between the atoms of the water molecule.

Now, hydrogen is the positive end of the dipole and the oxygen is the negative end of the dipole. We have seen the structures of the dipole moment. Now, the overall dipole moment of the water molecule is shown in the image attached.

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Some nitrogen atoms contain seven neutrons, while others contain eight. These two nitrogen types are isomers of one another.

Isotopes are variations of a chemical element with an atomic nucleus that contains the same number of protons but a different number of neutrons. Isotopes have different atomic masses even though they share the same element's atomic number and are therefore members of the same family. This implies that while isotopes of the same element have different physical properties, they share the same chemical properties.

Isotopes can be created artificially or naturally. Carbon, for instance, has three naturally occurring isotopes: carbon-12, carbon-13, and carbon-14, whereas other elements, like iodine or mercury, have a number of artificially produced isotopes.

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Answer:

The correct answer is - 1, 2, and 4 statements.

Explanation:

Beta and gamma turns are common plots or turns in proteins and contain intra-turn hydrogen bonds. This hydrogen bond is present between CO of residue i and NH of residue i+3 that holds the confirmation in beta turns.

Beta turns, assist the protein to get their globularity, as the aim of beta turns is to reverse the direction of the polypeptide. The two main of beta turns are type-I and type-Il. and their minor images are type-I and type-Il.

Thus, the correct answer is - 1, 2, and 4 statements.

So,

There's an equation that we could use in order to find frequency, and it is the next one:

This equation tells us that the energy of the photon is equal to the product of the Plank constant (h), which is 6.626*10^-34 J.s, and the frequency.

In this problem, we know the value of E and the value of h, so we need to solve for v:

Therefore, the correct answer option is A.

Answer: Sterilization

Explanation:

The pipette needs to be sterile so that nothing interferes with the DNA sample.

The cocoon that the Bombyx mori caterpillar spins yields silk. The thread fibers are secreted from the caterpillar's mouth, where they are spun into a cocoon.

Silk strands are used in the creation of cocoons by silkworms.

Proteins called sericin and fibroin, which are synthesized in the silk gland and released through a spinneret at the larvae's head, make up these threads.

To produce silk fiber, one thread is chosen from the cocoon and unraveled.

Mulberry leaves are used to feed the silkworm larvae during this phase, and following their fourth moult, they climb a nearby twig to spin their silken cocoons.

After treating the cocoon with boiling water, the silk is tenderly unraveled from the cocoon. 10 kilogram or so of cocoon produces 1 kg of silk.

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Answer:

Water is unique because of our need to survive on something so simple. It is just 2 hydrogen atoms and an oxygen. so simple, but necessary for all of our lives. Just 3-4 minutes without it causes permanent damage

Approximately 12.45 grams of solid silver chromate will precipitate when 150 mL of 0.500 M silver nitrate solution is added to excess potassium chromate.

To determine the number of moles of AgNO3 present in 150 mL of a 0.500 M AgNO3 solution, we can use the formula:

moles = concentration × volume

Given:

Concentration of AgNO3 solution = 0.500 M

Volume of AgNO3 solution = 150 mL

First, we need to convert the volume from milliliters (mL) to liters (L) since the concentration is given in moles per liter (M).

1 L = 1000 mL

Therefore, the volume of the AgNO3 solution in liters is:

150 mL × (1 L / 1000 mL) = 0.150 L

Now we can calculate the moles of AgNO3 using the formula:

moles = concentration × volume

moles = 0.500 M × 0.150 L

moles = 0.075 mol

So, there are 0.075 moles of AgNO3 present in 150 mL of the 0.500 M AgNO3 solution.

Now, let's proceed to determine how many grams of solid silver chromate (Ag2CrO4) will precipitate when the AgNO3 solution reacts with excess potassium chromate (K2CrO4).

From the balanced chemical equation:

2AgNO3(aq) + K2CrO4(aq) → Ag2CrO4(s) + 2KNO3(aq)

We can see that the molar ratio between AgNO3 and Ag2CrO4 is 2:1. Therefore, for every 2 moles of AgNO3, we will form 1 mole of Ag2CrO4.

Since we have 0.075 moles of AgNO3, we can calculate the moles of Ag2CrO4 formed:

moles of Ag2CrO4 = 0.075 mol / 2 = 0.0375 mol

To determine the mass of Ag2CrO4, we need to multiply the moles by its molar mass. The molar mass of Ag2CrO4 is calculated by summing the atomic masses of each element in the compound:

Ag2CrO4 = 2(Ag) + 1(Cr) + 4(O) = 2(107.87 g/mol) + 1(52.00 g/mol) + 4(16.00 g/mol) = 331.87 g/mol

mass of Ag2CrO4 = moles of Ag2CrO4 × molar mass of Ag2CrO4

mass of Ag2CrO4 = 0.0375 mol × 331.87 g/mol = 12.45 g

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The nuclear charge increases the size of an atom decrease as you move across a period.

Over time, the atomic size shrinks as the number of shells stays constant but more electrons are added, increasing the nuclear charge. A increased pulling of electrons from the outermost shell towards the nucleus as a result reduces the size. While electron shielding remains constant over time, effective nuclear charge increases. A reduced atomic radius is the result of the electron cloud being drawn closer to the nucleus due to a higher effective nuclear charge's greater attraction to the electrons. Any group's atomic size changes from top to bottom as a result of increases in each of the three variables.

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The question requires us to calculate the energy, in joules (J), necessary to heat 83.5g of water from 26.7 °C to 75°C.

The heat energy (Q) can be calculated from the mass of the sample (m), its specific heat capacity of the substance (C) and temperature variation (ΔT), as given by the following equation:

Since the question did not provide a value for the specific heat capacity of water, we'll adopt the value 4.182 J/g.°C. Applying the values provided by the question, we can calculate the heat energy as:

Therefore, the heat energy necessary to heat the amount of water given grom 26.7 to 75°C is 1.69 x 10^4 J (or 16900 J).

A substance composed of atoms of more than one element that are held together by chemical bonds is called a compound. Therefore the correct option is option A.

A compound is a pure material that is created by chemically combining two or more distinct components in a specific order. Chemical bonds, which can be ionic or covalent, hold the atoms of a substance together.

The characteristics of compounds are distinct from the characteristics of the constituent parts.

For instance, sodium is a soft metal and chlorine is a greenish-yellow gas; nevertheless, when these two elements combine to produce sodium chloride (table salt), they create a white crystalline solid that is far more stable than the constituent parts of each element alone. Therefore the correct option is option A.

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Answer:

avg is 85.4678 atomic mass unit

At constant temperatures, the simplest approach to reduce the volume of a gas is to raise its pressure. So, at 700 bar, or 700 times normal atmospheric pressure, hydrogen has a density of 42 kg/m3, compared to 0.090 kg/m3 at normal pressure and temperature.

Hydrogen decreases metal oxides in the reactivity series below. That is, hydrogen can only decrease the oxides of metals that are less reactive than hydrogen itself.

High-Temperature Water Splitting: Chemical processes that split water to make hydrogen are fueled by high temperatures generated by solar concentrators or nuclear reactors.

The oxidation number of hydrogen gas is 0, but the oxidation state of hydrogen atoms in water is +1. As a result, the hydrogen atom has been oxidized. It acts as a reducing agent.

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The mass of carbon monoxide produced is approximately 1010 g.

The balanced equation for the reaction of carbon with silicon dioxide to produce carbon monoxide and silicon carbide is given below:

SiO₂ (s) + 3C (s) → SiC (s) + 2CO (g)

We are given the mass of carbon and silicon dioxide used in the reaction and we need to determine the mass of carbon monoxide produced.

Using the mole ratio from the balanced equation, we can calculate the number of moles of carbon dioxide produced:

1 mole of SiO₂ reacts with 3 moles of C to produce 2 moles of CO

Therefore, 3.5 g of C reacts with (5.0 g of SiO₂)/(60.1 g/mol) = 0.083 mol of SiO₂

Reacting with 0.083 mol of SiO₂ requires (3/0.083) mol of C = 36.14 mol of CO

The mass of 36.14 mol of CO is:

36.14 mol × 28.01 g/mol = 1010 g

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The state that is reached when ions are entering solution at the same rate at which they leave solution to regenerate a solid is called solubility equilibrium.

Equilibrium is the state in a chemical system where the forward and reverse reactions occur at equal rates, resulting in no net change in the concentrations of reactants and products. In the context of ions entering and leaving a solution, this refers to a dynamic balance between the dissolution of a solid and the precipitation of the same solid.

When ions are introduced into a solution, they have the potential to dissolve and form hydrated ions, increasing the concentration of the ions in the solution. However, at the same time, the hydrated ions can also combine and precipitate as a solid, reducing the concentration of the ions in the solution. When the rate of dissolution and precipitation becomes equal, the system reaches a state of equilibrium, where the concentration of the ions remains constant over time.

In this equilibrium state, the solution and the solid are in a dynamic balance, with ions continuously entering and leaving the solution, but the overall concentration of the ions remains constant. This concept is fundamental in understanding chemical reactions and the behavior of solutions.

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Answer:

Reducing sugars are absent

Explanation:

Benedict's solution is an substance used in testing sugars. It is mixture of sodium carbonate, sodium citrate and copper(II) sulfate pentahydrate. It can be used instead of Fehling's solution in testing for the presence of reducing sugars.

Reducing sugars contain the -CHO group. If there is no colour change after the addition of Benedict's solution, then we can conclude that reducing sugars are absent.

In a galvanic cell, the reaction proceeds towards the production of products.  ΔG starts < 0, becomes more negative

Option B is correct .

As the reaction proceeds, the Gibbs free energy (ΔG) reduces, and the following are true:  ΔG starts < 0, becomes more negative.

When the reaction in a galvanic cell proceeds towards the production of products, the Gibbs free energy starts with a negative value, and it becomes even more negative.

The Gibbs free energy (ΔG) is a measure of the available energy in a system that can be used to do work. It measures the difference between the free energy of the final state and the initial state.The Gibbs free energy change of a system is dependent on the enthalpy and entropy change. If the enthalpy change is negative (exothermic), and the entropy change is positive (disorderly), the Gibbs free energy change is negative, and the reaction is spontaneous.

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The initial reaction concentration of A is 0.378M and its concentration decreases to 0.026M in 540s.

The rate of disappearance of A is directly proportional to the concentration of A i.e.  -d[A]/dt = k[A]^n Where d[A]/dt is the rate of disappearance of A,k is the rate constant and n is the order of the reaction. Integrating the above equation, we get  ln[A] = -kt + c Taking exponentials on both sides of the equation, we get  [A] = e^(-kt + c) = e^c * e^(-kt) = k' e^(-kt)where k' = e^c is the integration constant.

Let us take two concentration values, [A1] and [A2] at two time instants t1 and t2 respectively. The average rate of disappearance of A from t1 to t2 is given by -∆[A]/∆t = ([A2] - [A1]) / (t2 - t1)We need to find the average rate of disappearance of A from 90.0 seconds to 360.0 seconds. In this case, [A1] = 0.242 M, [A2] = 0.026 M, t1 = 90.0s and t2 = 360.0s. Substituting these values in the formula,-∆[A]/∆t = ([A2] - [A1]) / (t2 - t1)= (0.026 M - 0.242 M) / (360.0s - 90.0s)= (-0.216 M) / (270.0s)= -8.0 * 10^-4 M/sSo, the average rate of disappearance of A from 90.0 seconds to 360.0 seconds is -8.0 * 10^-4 M/s.

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1 mole of CO2 is 6.022 x 10^23 molecules of CO2. It is also 44.01 g of CO2. Here 44.01 g comes as the sum of individual atoms of CO2 i.e. 12.01 + 16 + 16 i.e. 44.01 g

CO2 is composed of one carbon atom and two oxygen atoms, which have the atomic masses of 12.01 g/mol and 16.00 g/mol respectively. So, the molar mass of CO2 is the sum of the atomic masses of the atoms that make up CO2, which is 12.01 + 16.00 + 16.00 = 44.01 g/mol. Carbon dioxide (CO2) is a naturally occurring compound made up of one carbon atom and two oxygen atoms. It is a colorless, odorless gas and is a byproduct of many biological and industrial processes. CO2 is a greenhouse gas, which means it helps trap heat in the Earth's atmosphere and contributes to global warming.

Therefore, one mole of CO2 weighs 44.01 grams.

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0.808 grams of pure hydrogen reacted in the reaction.

The balanced chemical equation for the reaction is:

Mg + 2HCl → MgCl2 + H2

From the equation, we can see that 1 mole of Mg reacts with 2 moles of HCl to produce 1 mole of H2.

First, let's calculate the number of moles of H2 produced:

The volume of H2 produced at STP is 8.96 dm^3, which is equal to 8.96/22.4 = 0.4 moles of H2.

Since 1 mole of Mg reacts with 1 mole of H2, the number of moles of Mg consumed in the reaction is also 0.4 moles.

The molar mass of Mg is 24.31 g/mol, so the mass of Mg consumed is:

Mass of Mg = number of moles of Mg × molar mass of Mg

Mass of Mg = 0.4 mol × 24.31 g/mol

Mass of Mg = 9.724 g

Therefore, the mass of pure hydrogen that reacted is:

Mass of H2 = number of moles of H2 × molar mass of H2

Mass of H2 = 0.4 mol × 2.02 g/mol

Mass of H2 = 0.808 g

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answer

Gives brown colour gas

The necessary voltage to power the electrolysis of molten sodium chloride is 4V.

Electrolysis is the breakdown of a compound into the elements it is formed from by passing electricity through it. It is actually a chemical reaction in which one element loses electrons and the other may gain electrons. The process of electrolysis has wide applications in electroplating, metallurgical processes, production of chlorine gas, etc.

Molten sodium chloride is generally used in the production of chlorine gas and sodium metal. This molten or aqueous form of sodium chloride is also known as brine. The process is carried out in a cell called the Down's cell.

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Answer:

Awnser is A

Explanation:

Answer:

Hello There!!

Explanation:

The answer is↬O A. A measurement indicating how acidic a solution is.

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