why hot water is hot on touching?​

Answer:

8. The particles have the same volume in each container (not so sure about number 8 )  9. Solid  10. Gas 11. Temperature and Pressure

To tell a Cu(NO3)2 solution from a Ni(NO3)2 solution, you can add KI to the solution. If the solution contains Cu(NO3)2, the brown precipitate will be formed, but if the solution contains Ni(NO3)2, no precipitate will be formed.

This is the best way to distinguish between these two solutions, since adding KOH or Na2C2O4 will result in blueish precipitates, being harder to identify if it is Cu(NO3)2 or Ni(NO3)2 and with Na2SO4 no reaction will happen.

It means that the answer is: By adding KI and seeing if a brown precipitate is formed.

In the image provided below, you can see the structure of 1,3-dinitrocyclopentane.

We can conclude the following information from the compound's name, 1,3-dinitrocyclopentane, which will assist us in drawing the structure :-

1,3 - position of NO₂ groups, di - two, nitro - NO₂, clo - cyclic, pentane - five.

➤ The following are the general steps for drawing any compound's        Lewis structure:

According to the Octet Rule almost all atoms, in this case, carbon must always have four bonds because they are most stable with eight total electrons.

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Answer:

You need to dissolve 16.988 g of AgNO3 in enough water to make a final volume of 1.0 L to make a 0.1 M solution of AgNO3.

Explanation:

To make a 1.0 L of a 0.1 M solution of AgNO3, you need to know the molar mass of AgNO3, which is:

Ag = 107.87 g/mol

N = 14.01 g/mol

O = 16.00 g/mol (there are three O atoms, so 3 x 16 = 48.00 g/mol)

Total = 169.88 g/mol

Next, you need to calculate the mass of AgNO3 required to make a 0.1 M solution in 1.0 L of water:

0.1 moles/L * 1.0 L = 0.1 moles

Mass = moles x molar mass

Mass = 0.1 moles x 169.88 g/mol

Mass = 16.988 g

Therefore, you need to dissolve 16.988 g of AgNO3 in enough water to make a final volume of 1.0 L to make a 0.1 M solution of AgNO3.

The pH of H2SO4 is 1.20×10–2.

We need to determine the pH of a 0.310 M solution of H2SO4.In order to find pH, we'll need to find the [H+] of the solution.

At equilibrium, the concentration of H+ will be twice that of the initial concentration of H2SO4.

Thus, [H+] = 2 × 0.310 = 0.620 M

The concentration of [SO42-] will also be 0.310 M.

Using the Ka2 expression for H2SO4 gives:

Ka2 = ([H+][SO42-])/[H2SO4]1.20 × 10-2 = (0.620 x 0.310)/[H2SO4][H2SO4] = 0.12 M

The [H+] in the solution is 2 × 0.310 = 0.620 M,

so:

pH = -log([H+]) = -log(0.620) = 0.2064 (rounded to four significant figures)pH = 0.21 (rounded to two significant figures)

Therefore, the pH of a 0.310 M solution of H2SO4 is 0.21.

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Answer:

D.The increases in CO2 is caused by burning of fossil fuels

Explanation:

CO2 increases happens because the coal or oil burning process combines carbon with oxygen in the air to make CO2.

so the answer is D. The increase in CO2 is caused by burning of fossil fuels

The mole fraction of methanol is 0.100 in a 78.0-g 78.0-g aqueous solution of methanol, ch4o, ch 4 o. Is  the mass of methanol in the solution is 7.809 g and the mass of water is 39.425 g.

The mole fraction of methanol (CH4O) in the solution is 0.100, which means that 10% of the moles of the solution are methanol. We can use this information, along with the total mass of the solution, to determine the mass of each component.

The total moles of the solution can be calculated by dividing the total mass of the solution by its molar mass. Methanol has a molar mass of 32.04 g/mol, so we have:

total moles of solution = 78.0 g / 32.04 g/mol = 2.434 mol

Now we can calculate the moles of methanol:

moles of methanol = 0.100 x 2.434 mol = 0.2434 mol

The remaining moles are water:

moles of water = 2.434 mol - 0.2434 mol = 2.1906 mol

To calculate the mass of each component, we can use their respective molar masses:

mass of methanol = 0.2434 mol x 32.04 g/mol = 7.809 g

mass of water = 2.1906 mol x 18.02 g/mol = 39.425 g

Therefore, the mass of methanol in the solution is 7.809 g and the mass of water is 39.425 g.

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To see the number of atoms of an element in a given molecule we need to multiply stoichiometry to the number that is written on the foot of the element that is stoichiometry. The correct option is option A.

Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit. Atoms can make many different molecules, just like letters can make many different words.

In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. So overall the charge of nucleus is due to only proton, not by neutron.

Therefore, the correct option is option A that is Atoms can make many different molecules, just like letters can make many different words.

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The kinetic theory states the movement of the molecules in a matter. The particles of oxygen at low temperatures slow down and losses their kinetic energy.

The kinetic theory states the motion and speed of the molecule of a matter. The theory states about the molecules separated by distance moving in a random motion that is constant.

The particles of the matter collide elastically with each other and this speed and collision depend on the temperature and pressure applied. The kinetic energy is directly dependent on the temperature.

As the temperature of oxygen gas decreases the collision and the speed of the particles also reduce resulting in less kinetic energy. It also leads to a drop in pressure.

Therefore, at low temperatures, kinetic energy, collision, and speed decrease.

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By the principle of atom economy the second process is more efficient.

We know that the atom is the smallest particle of a substance that could take part in a chemical reaction. We are also aware that all compounds are composed of atoms and that a chemical reaction has to do with the rearrangement of atoms in such a way that be products could be formed.

In this case, we know that an organic product may be obtained in a sequence of reactions and the atom economy is very important in the nature of the process that is being carried out. Let us now take  good look at the two processes that could be shown.

In the first process, we can see that there are a lot of products that could just be classified as side products and does not have a real relevance to the final products. In the second process, we have only one waste product and that is water.

As such, by the principle of atom economy the second process is more efficient.

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The pressure exerted by the individual gases in a mixture is called the partial pressure. Here the equilibrium partial pressure of PCl₅ is 0.038 , PCl₃ is 0.662 and Cl₂ is 0.662.

The ratio of the product of molar concentrations of the products to that of the reactants with each concentration term raised to a power equal to its coefficient in the balanced chemical equation is the equilibrium constant.

In terms of partial pressures, equilibrium constant Kp is:

Qp = pPCl₅ / (pPCl₃ ) (pCl₂)

= 0.20 / 0.5 × 0.5

= 0.8

Here Qp > Kp, so the reaction shift towards reactant side.

The ICE table is:

          PCl₃ + Cl₂ ⇄  PCl₅

I         0.50    0.50     0.20

C        +x         +x         -x

E  0.50 + x   0.50 + x  0.20 - x

Kp = 0.200 -x / (0.5+x)(0.5+x)

0.0870 = 0.200 -x / (0.5+x)(0.5+x)

x = 0.162

The equilibrium partial pressures of PCl₃ and Cl₂ are:

0.5 + x = 0.5 + 0.162 = 0.662 atm

The equilibrium partial pressures of PCl₅ is:

0.200 - 0.162 = 0.038 atm

Thus the equilibrium partial pressures of PCl₃ , PCl₅ and Cl₂ are determined.

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Volume of Argon = 59.972 L

In general, the gas equation can be written  

\(\large {\boxed {\bold {PV = nRT}}}\)

where  

P = pressure, atm  

V = volume, liter  

n = number of moles  

R = gas constant = 0.08206 L.atm / mol K  

T = temperature, Kelvin  

At STP(0 C, 1 atm), 1 mol gas= 22.4 L

so for 20 L

\(\tt \dfrac{20}{22.4}=0.893\)

For Argon

P = 1 atm

T = 273 K x 3 =819 K (tripled)

n = 0.893 (the same number of moles)

R = 0.082 L/atm.mol K

\(\tt V=\dfrac{nRT}{P}=\dfrac{0.893\times 0.082\times 819}{1}=59.972~L\)

Answer:

They are called corpuscles

Explanation:

Zinc is needed for DNA synthesis, protein metabolism, wound healing, growth, development of sexual organs, and white blood cell formation.

Zinc is the vital mineral required for the DNA synthesis, the cell division, growth wound healing and cell formation. zinc is needed for the development the and the function of the most body parts. Zinc regulates the DNA synthesis. zinc also effect the hormonals regulation of the cell division. in general DNA polymerase do not appear the zinc. zinc is the important mineral.

Thus, Zinc is needed for DNA synthesis, protein metabolism, wound healing, growth, development of sexual organs, and white blood cell formation.

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Answer: gravity affect the amount of both kinetic and potential energy

Explanation:

Answer:

Explanation:

A measurement is the action of measuring something, or some amount of stuff. So it is important to measure certain things right, distance, time, and accuracy are all great things to measure. By measuring these things or in other words, by taking these measurements we can better understand the world around us.

Answer:

Measurement is the process of comparison of an unknown physical quantity with a known physical quantity.

It is important because measurement is needed in every day life we need measurement in simply cooking food to designing a house and many more other works.

Explanation:

hope this helps you.

Answer:

From the image the answer is 24.

Answer:

24

Explanation:

thats from the image and every little line is 2 degrees Celsius and its 2 tiny lines away from 20

Meiosis is important because it ensures that all organisms produced via sexual reproduction contain the correct number of chromosomes. Meiosis also produces genetic variation by way of the process of recombination. HOPE it helps

Answer:

Aluminum

Explanation:

Each chlorine atom needs one more valence electron to have a full valence electron shell, so X needs to have 3 valuence electrons. The only that satisfies this is aluminum.

The following reactions are redox reactions are,

a. 4K(s) + O2(g) → 2K2O(s)

b. Al(s) + 3Ag+(aq) → Al3+(aq) + 3Ag(s)

d. SO3(g) + H2O(l) → H2SO4(aq)

Redox (shorthand for reduction/oxidation reaction) reactions are chemical reactions in which the oxidation state of atoms is changed.

These reactions are the basis for batteries, fuel cells, and other energy storage devices, and they also play a crucial role in the metabolic processes of living organisms.

Example of a Redox reaction,

Al(s) + 3Ag+(aq) → Al3+(aq) + 3Ag(s)

In the above reaction, Al metal is oxidized (loses electrons) and Ag+ ions are reduced (gains electrons).

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An insulated bottle is designed to reduce the transfer of heat between the contents of the bottle and the surrounding environment so option D is correct.

Insulation is a material or a structure that is used to prevent or reduce the transfer of heat, sound, or electricity from one place to another. Insulation materials can be used in buildings, homes, and other structures to reduce the amount of heat loss or gain, improve energy efficiency, and maintain a comfortable indoor environment. They can also be used in electrical and electronic systems to prevent electrical leakage and reduce the risk of electrical shock. The most common insulation materials include fiberglass, cellulose, foam, and mineral wool.

Here,

The insulation material used in the bottle, which is usually made of materials like foam, plastic or glass, creates a barrier that prevents heat from entering or leaving the bottle, thus keeping the liquid inside cold or hot for a longer period of time.

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Hydrogenated compounds, particularly hydrogen gas (H2), are often considered as potential fuels for spark ignition engines.

Hydrogenated compounds are considered the most suitable fuels for spark ignition engines because hydrogen is a highly flammable gas with a low ignition energy and a wide flammability range. When compared to gasoline or diesel, hydrogen has a higher energy content by weight, which makes it an attractive fuel choice.

Due to increasing temperature, the chemical reaction rate also increases as the element moves from a solid to a liquid to a gas.Physical state transitions are dependent on temperature, and the rate of chemical reactions that occur as a result of these state transitions is also influenced by temperature.

At higher temperatures, the chemical reaction rate typically rises as molecules have more kinetic energy and collide with one another more frequently.

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The molecule that is formed from picking up hydrogen ions and electrons in the citric acid cycle is NADH.  Which are then transferred to NAD+ to form NADH.

During the citric acid cycle, various reactions occur which involve the breakdown of acetyl-CoA to produce energy in the form of ATP. As part of this process, NAD+ (nicotinamide adenine dinucleotide) molecules are reduced to form NADH. This reduction involves the picking up of hydrogen ions (H+) and electrons (e-) from the reaction, which are then transferred to NAD+ to form NADH. NADH is an important molecule in cellular respiration as it can be used to generate ATP through oxidative phosphorylation.

NADH then transports these hydrogen ions and electrons to the electron transport chain in the mitochondria, where they are used to generate ATP through oxidative phosphorylation. This process plays a critical role in cellular energy production.

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The number of moles of Kr present is 4.75 × 10⁻³ moles. The correct option is a. 4.75 × 10⁻³ moles

From the question, we are to determine the number of moles Kr present in 398 mg Kr.

From the formula,

\(Number \ of \ moles = \frac{Mass}{Atomic\ mass}\)

Mass of Kr = 398 mg = 0.398 g

Atomic mass = 83.798 g/mol

Number of moles = \(\frac{0.398}{83.798}\)

Number of moles = 0.0047495 mole

Number of moles ≅ 4.75 × 10⁻³ moles

Hence, the number of moles of Kr present is 4.75 × 10⁻³ moles. The correct option is a. 4.75 × 10⁻³ moles

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Answer:

How do Newton's laws of motion explain why it is important to keep the ice smooth on a hockey rink so that players can pass a puck as quickly as possible? Smooth ice reduces the unbalanced forces that would slow the hockey puck. A skydiver falls toward the ground at a constant velocity.

Explanation:

Answer:

Hey there :))

Speed and Velocity are related in a lot of ways distance and displacement are. Speed is a scalar and velocity is a vector. They both represent a way to measure the change in position of an object relative to time.

The combustion reaction is the process by which a chemical substance or hydrocarbon reacts with oxygen to produce carbon dioxide and water while also releasing energy in the form of light and heat.

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1. The chemical tests used in this experiment include the iron(III) test and the bromine test. The iron(III) test involves adding a few drops of iron(III) chloride to the unknown compound.

If a deep purple color appears, it indicates the presence of a phenolic group.

The bromine test involves adding a few drops of bromine water to the unknown compound.

If a color change from yellow to colorless or a pale yellow precipitate forms, it indicates the presence of an alkene.

2. A negative iron(III) test with eugenol can occur if the phenolic group is blocked or modified in some way.

For example, eugenol may contain a methoxy group (-OCH3) which can block the phenolic group and prevent it from reacting with the iron(III) chloride.

3. Skipping the drying step in the procedure can lead to a different IR spectrum as the presence of water can interfere with the analysis.

The IR spectrum of the sample may show additional peaks or broadening of existing peaks due to the presence of water.

4. The main difference between a steam distillation and a simple distillation is the addition of steam in steam distillation.

Steam is used to help separate the components of a mixture that have high boiling points. Simple distillation is used to separate two liquids with different boiling points.

5. If one employed a fractional distillation apparatus in this experiment, a more precise separation of the components of the mixture could be achieved.

This is because fractional distillation allows for multiple vaporization and condensation cycles, leading to a greater separation of the components with similar boiling points. The result would be a higher purity of the separated compounds.

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