A helium-filled weather balloon has a volume of 879 L at 21.9°C and 759 mmHg. It is released and rises to an altitude of 8.70 km, where the pressure is 281 mmHg and the temperature is –35.1°C. The volume of the balloon at this altitude is

This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97. The incorrect representation for a neutral atom is 36Li

To determine the correct representation for a neutral atom, we need to consider the atomic number (Z) and mass number (A) of the element. The atomic number represents the number of protons in the nucleus, while the mass number represents the sum of protons and neutrons.

Let's analyze the given representations:

36Li:

This representation suggests that the element is lithium (Li) with a mass number of 36, which is incorrect. The correct mass number for lithium is approximately 6.94.

613C:

This representation suggests that the element is carbon (C) with a mass number of 13, which is correct. Carbon has different isotopes, and 13C represents one of its stable isotopes.

3063Cu:

This representation suggests that the element is copper (Cu) with a mass number of 63, which is correct. Copper has different isotopes, and 63Cu represents one of its stable isotopes.

1530P:

This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97.

Therefore, the incorrect representation for a neutral atom is 36Li, as it does not match the known properties of lithium.

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A pressure of 12.5 atm is required to pop a kernel of popcorn. It's worth noting that this is a very high pressure, and it's the build-up of this pressure that causes the kernel to "pop".

To calculate the pressure required to pop a kernel of popcorn, we need to use the ideal gas law, which relates the pressure (P), volume (V), temperature (T), and number of moles of gas (n) in a system:

PV = nRT

Where R is the universal gas constant. We can assume that the temperature inside the popcorn kernel just before it pops is the same as the temperature in the microwave (100°C or 373 K). We also know that the only gas inside the kernel is water vapor, which has a molecular weight of 18 g/mol.

To calculate the number of moles of water vapor that is produced during the popping of the kernel, we can use the mass of water in the popcorn:

n = m/M

Where m is the mass of water (16.7 g) and M is the molar mass of water (18 g/mol). This gives us:

n = 16.7 g / 18 g/mol = 0.9286 mol

Now we can rearrange the ideal gas law to solve for pressure:

P = nRT / V

Substituting the known values, we get:

P = (0.9286 mol)(0.0821 Latm/molK)(373 K) / 3.1 L

P = 12.5 atm

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A catalyst can speed up the rate of a given chemical reaction by lowering the activation energy required for the

reaction to occur.

A catalyst is a substance that regulates the rate at which a chemical reaction occurs. A catalyst can either inhibit or promote a chemical reaction.

A catalyst is characterized by being involved in a chemical reaction but not being used up. A catalyst increases the rate of a chemical reaction by lowering the activation energy, which is the energy required for the reaction to start.

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Answer:

this is very easy to solve

this is a answer I am very sure

based on the law of conservation of energy its it atoms hold by strong chemical bonds

4.5 moles of O2 would make 3.40 moles of CO2.

The steps for this process are as follows

Step 1: Balance the equation:

C3H8 + 5O2 → 3CO2 + 4H2O

Step 2: Determine the molar ratio between O2 and CO2.

The molar ratio between O2 and CO2 is 5:3.

Step 3: Calculate the moles of CO2 produced.

If you start with 4.5 moles of O2, you can calculate the moles of CO2 produced using the molar ratio:

4.5 moles O2 × (3 moles CO2/5 moles O2) = 2.7 moles CO2

Since you can't have a fraction of a mole, we have to round the answer up to the nearest whole number.

This means that 4.5 moles of O2 will produce 3.75 moles of CO2.

In the given question,  in the options not give 3.75 moles, but have 3.40 mole , so the answer is 3.40 moles its the approximate value of 3.75

This question uses the concept of stoichiometry, which is the calculation of the amount of substances involved in a chemical reaction.

By knowing the molecular ratios between the reactants and products, it is possible to calculate the amount of each product that is produced from a given amount of reactants.

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There are approximately 3.47 x 10²² molecules in 5.657g H₂SO₄.

To calculate the number of molecules in 5.657g H₂SO₄, we need to use the Avogadro's number and the molar mass of H₂SO₄.

The molar mass of H₂SO₄ is 98.079 g/mol.

We need to calculate the number of moles of H₂SO₄:

Number of moles = mass/molar mass

                             = 5.657g / 98.079 g/mol

                            = 0.05767 mol.

Then, we can use Avogadro's number, which is 6.022 x 10²³ molecules/mol, to find the number of molecules:

Number of molecules = number of moles x Avogadro's number

                                   = 0.05767 mol x 6.022 x 10²³ molecules/mol

                                    = 3.47 x 10²² molecules

To calculate the number of molecules in a given sample of a substance, you need to use the Avogadro's number, which is 6.022 x 10²³ molecules/mol. This means that one mole of a substance contains 6.022 x 10²³ molecules.

We are given the mass of H₂SO₄, which is 5.657 g. To calculate the number of molecules, we first need to determine the number of moles of H₂SO₄ in the given sample. The molar mass of H₂SO₄ is 98.08 g/mol. So, the number of moles of H₂SO₄ can be calculated as follows:

moles = mass / molar mass

moles = 5.657 g / 98.08 g/mol

moles = 0.0576 mol

Now, we can use the Avogadro's number to determine the number of molecules of H₂SO₄ in 0.0576 moles:

number of molecules = moles x Avogadro's number

number of molecules = 0.0576 mol x 6.022 x 10²³ molecules/mol

number of molecules = 3.47 x 10²² molecules

As a result, in 5.657 g of the material, there are roughly 3.47 x 1022 molecules of H₂SO₄.

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Answer:

  -172.6 °C

Explanation:

You want to know the Celsius equivalent of the temperature 100.6 K.

The relation is ...

  C = K - 273.15

  C = 100.6 -273.15 = -172.55

The temperature is -172.55 °C, about -172.6 °C.

__

Additional comment

We have rounded to tenths, because that is precision of the temperature given. If you use 273 as the conversion constant, you will get -172.4.

Answer:

they are said to be excited.

Explanation:

excitation is a fundamental concept in atomic physics that helps explain many of the properties and behaviors of matter on both the macroscopic and microscopic scales.

The interaction between polar water molecules and the partially charged ions of glucose, resulting in ion-dipole forces, is the strongest inter molecular force in the solvent-solute interaction.

Solute interaction is the interaction between two or more solutes in a solution. This interaction can be either physical or chemical in nature. Physical interactions involve the solutes having an effect on each other due to their shape, size or charge. Chemical interactions involve the solutes reacting with each other to form new compounds. In either case, the solutes will have an effect on the properties of the solution such as viscosity, boiling point, freezing point, and solubility. Solutes can also interact with each other when they are mixed together, as in a mixture of two liquids or a mixture of two solids.

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The correct arrangement on the basis of most to least concentration in troposphere will be: Cardon dioxide > Ozone > Carbon mono oxide > Hydroxyl radical.

In this lowest layer, the air is the densest. In actuality, the troposphere makes about 75 percent of the total weight of the atmosphere. The two most common gases are nitrogen (78%) and oxygen (21%), with argon (.9%) and a trace amount of hydrogen ozone (a kind of oxygen) making up the remaining 1% of all gases. The troposphere's temperature and water vapor concentration drop sharply with altitude.

Carbon monoxide background levels across the world vary from 0.06 to \(0.14 mg/m^3\) (0.05– 0.12 ppm).

About 3 billion metric tons of ozone are present in the atmosphere as a whole. Even while that may seem like a lot, the atmosphere only makes up 0.00006 percent of it.

The concentration of hydroxyl radical is the minimum.

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Answer: D 45.1

Explanation:

100/106.441 x(3/2) x (31.9988) = 45.1

106.441 is the molar mass of NaClO3 from the periodic table

31.9988 is the molar mass of O2 from the periodic table

Answer:

See explanation

Explanation:

For this question, we have to remember the effect of an atom with high electronegativity as "Br". If the "Br" atom is closer to the carboxylic acid group (COOH) we will have an inductive effect. Due to the electronegativity of Br, the electrons of the C-H bond would be to the Br, then this bond would be weaker and the compound will be more acid (because is easier to produce the hydronium ion \(H^+\)).

With this in mind, for A in the last compound, we have 2 Br atoms near to the acid carboxylic group, so, we will have a high inductive effect, then the C-H would be weaker and we will have more acidity. Then we will have the compound with only 1 Br atom and finally, the last compound would be the one without Br atoms.

In B, the difference between the molecules is the position of the "Br" atom in the molecule. If the Br atom is closer to the acid group we will have a higher inductive effect and more acidity.

See figure 1

I hope it helps!

All the layers should be kept until the experiment is complete.

In chemistry, solvent extraction is accomplished by adding a sample containing the substance to be separated into a system of two solvents, an aqueous layer and an organic layer.

It is important to note that all the layers should be kept until the experiment is complete. No layer ought to be discarded before the work is completed.

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(a) Because acid is caustic, dolphins can perish from exposure to it. Acids are compounds that give other things protons (H+). Acid can react with the proteins and lipids in dolphins' skin when they come into touch with it, leading to chemical burns and damage to the underlying tissue. Systemic consequences from this include death.

(b) Because chlorine is a potent oxidizer, it interacts with red-hot iron powder to produce Iron(III) chloride (FeCl3) rather than Iron(II) chloride (FeCl2). FeCl3 is created when chlorine at high temperatures rapidly accepts electrons from iron atoms. Contrarily, iron interacts with HCl, a less potent oxidizer than chlorine, to produce FeCl2.

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Answer: A chemical change occurs when the substance's composition is changed. When bonds are broken and new ones are formed a chemical change occurs.

A liquid substance that could be used in the laboratory for dissolving dry mortar on floor tiles is vinegar; (i) removing KMnO₄, stains is sodium metabisulfite solution; drying acid anhydrides is concentrated sulfuric acid.

Solvents are substances usually liquids, but may also be gases or solids that dissolve other substances known as solutes.

Solvents are usually used as cleansing agents.

One possible liquid substance that could be used for dissolving dry mortar on floor tiles is a mild acid solution, such as diluted hydrochloric acid or vinegar.

KMnO₄ stains are often difficult to remove, but one substance that can be used is sodium metabisulfite (Na₂S₂O₅) solution. Sodium metabisulfite acts as a reducing agent and can effectively neutralize and remove KMnO₄ stains.

Concentrated sulfuric acid is commonly used in the laboratory as a drying agent. It has a strong affinity for water and can efficiently absorb moisture, including water present in acid anhydrides.

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Answer:

I wouldn't risk it if i were you haha

Explanation:

The coefficients that should be added to balance the chemical equation are: 2, 3, 2, 2

Coefficients are numbers written before elements or compounds in a chemical equation in order to balance it.

To obtain the coefficients, we shall balance the equation. This is illustrated below.

HgS + O₂ → HgO + SO₂

There are 3 atoms of O on the right and 2 atoms on the left. It can be balance by writing 3 before O₂, 2 before HgO and 2 before SO₂ as shown below

HgS + 3O₂ → 2HgO + 2SO₂

There are 2 atoms of Hg on the right and 1 atom on the left. It can be balance by writing 2 before HgS as shown below

2HgS + 3O₂ → 2HgO + 2SO₂

Now, the equation is balanced!

Thus, the coefficients needed are 2, 3, 2, 2

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Answer:

D. [HCHO₂] > [NaCHO₂]

Explanation:

Formic acid, HCHO₂, is a weak acid that, in presence of its conjugate base, NaCHO₂ (CHO₂⁻), produce a buffer following H-H equation:

pH = pKa + log [CHO₂⁻] / [HCHO₂]

As pKa of the acid is 3.74 and pH of the solution is 3.11:

3.11 = 3.74 + log [CHO₂⁻] / [HCHO₂]

-0.63 = log [CHO₂⁻] / [HCHO₂]

0.2344 = [CHO₂⁻] / [HCHO₂]

A ratio [CHO₂⁻] / [HCHO₂] < 1, means:

The partial charges on each fluorine atom are negative. Option B) The central O atom is the correct answer. Option B

The partial charges in a molecule are determined by the electronegativity values of the atoms involved. Electronegativity is the ability of an atom to attract electrons towards itself in a chemical bond. In the case of \(F_2O\), fluorine (F) is more electronegative than oxygen.

Fluorine is the most electronegative element on the periodic table, meaning it has a high ability to attract electrons. Oxygen is also relatively electronegative but less so than fluorine. When fluorine atoms bond with oxygen, the shared electrons will be pulled more towards the fluorine atoms, creating a polar covalent bond.

In \(F_2O\), each fluorine atom will pull the shared electrons towards itself, resulting in a higher electron density around the fluorine atoms. This creates a region of partial negative charge around the fluorine atoms.

Conversely, the oxygen atom will have a region of lower electron density and, therefore, a partial positive charge. This is because the shared electrons spend more time around the fluorine atoms due to their higher electronegativity.

Option B

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Motor proteins such as myosin are able to generate force by undergoing a series of conformational changes.

Conformational change in protein is an important aspect for the protein functioning. Proteins need to be switched off and on based on the requirements. For this, ligands usually activate or deactivate the proteins.

Protofilaments are the structures that are associated with cytoskeleton structures of the cells. Adding amino acids is done while translation but not after that. However, cleavage may occur depending the ongoing process.

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Answer:

D. C → Cl electronegativity difference > 0.5

Explanation:

The electro negativity of an atom in a compound refers to its ability to attract the electrons of a bond towards itself.

On the Pauling's scale, carbon has an electro negativity value of 2.55 while that of chlorine is 3.16. The difference in electro negativity between the both atoms is about 0.61.

The dipole is aslways directed towards the more electronegative atom. Hence the direction is ; C → Cl

Answer:

Can u write in a paper and post again unable to understand

Answer:

heat wave

Explanation:

A high pressure system is a whirling mass of cool, dry air that generally brings fair weather and light winds. When viewed from above, winds spiral out of a high-pressure center in a clockwise rotation in the Northern Hemisphere.

Answer:

They are 4 short column on the periodic table