. Name three types of energy that exist in a large piece of charcoal on a grill in the sunlight. Explain why the charcoal has each type of energy. (3 points)

Answer:

(c) Low temperature, high pressure

Explanation:

Liquefaction of a gas means the conversion of the gas to liquid. To convert a gas to liquid, we have to look a bit at the statements of the kinetic theory of gases.

Gases show ideal behavior within the range of high temperature and low pressure. Under these conditions, minimum intermolecular interactions occur between gas molecules.

However, as the temperature is deceased and pressure in increased, intermolecular interactions become significant and the gas begins to liquefy.

Answer: Both the given species are isotopes of the same element.

Explanation:

An isotope is defined as the chemical species that have the same atomic number but a different mass number.

The atom consists of 3 subatomic particles:

An atomic number is defined as the number of protons or number of electrons present in a neutral atom. It remains specific for a particular element.

Mass number is defined as the sum of the number of protons and neutrons present in the nucleus of an atom.

Given values:

For isotope 1:

Number of protons = 11 = atomic number

Number of neutrons = 13

Mass number = 11 + 13 = 24

For isotope 2:

Number of protons = 11 = atomic number

Number of neutrons = 12

Mass number = 11 + 12 = 23

As the atomic number of both the isotopes is the same. Thus, they belong to the same elements.

Answer:

Cell division is central to organism growth, reproduction and tissue repair.

Explanation:

Hope this helps!

Answer:

multiply, survive grow

The reactant that must be present for a reaction to be classified as combustion is Option C- O2​.

What is a combustion reaction?

A combustion reaction is a type of exothermic reaction in which a substance reacts quickly with oxygen gas, generating heat and often light in the process. Combustion is the act of burning, and it usually requires heat.

Combustion is a type of chemical reaction that occurs between oxygen and a fuel source when it is heated to its ignition temperature. A typical combustion reaction is one in which a hydrocarbon reacts with oxygen to produce carbon dioxide and water vapor.

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The pH of the apple juice is approximately 3.52.

The pH of ammonia is approximately 11.13.

The pH of the apple juice can be calculated using the formula pH = -log[H₃O⁺], where [H₃O⁺] is the hydronium ion concentration. Given that the hydrogen ion concentration of the apple juice is 0.0003, the hydronium ion concentration can be calculated as follows:

[H₃O⁺] = 10^(-pH)

0.0003 = 10^(-pH)

-pH = ㏒(0.0003)

pH = -㏒(0.0003)

pH = 3.52

As a result, the pH of apple juice is roughly 3.52.

Similarly, the pH of ammonia can be calculated using the same formula. However, we are given the hydrogen ion concentration for ammonia, so we need to calculate the hydronium ion concentration first. Ammonia is a base, so it reacts with water to produce hydroxide ions (OH⁻):

NH₃ + H₂O → NH₄⁺ + OH⁻

The equilibrium constant for this reaction is the base dissociation constant, Kb. For ammonia, Kb = 1.8 x 10⁻⁵ at 25°C. Using this value, we can calculate the concentration of hydroxide ions as follows:

Kb = [NH4⁺][OH⁻]/[NH₃3

1.8 x 10⁻⁵ = x²/0.05

x = 1.34 x 10⁻³

Therefore, the concentration of hydroxide ions is 1.34 x 10⁻³ M. Using the formula for pH, we can now calculate the pH of ammonia:

pOH = -㏒[OH⁻] = -㏒(1.34 x 10⁻³) = 2.87

pH = 14 - pOH = 14 - 2.87 = 11.13

As a result, the pH of ammonia is about 11.13.

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Answer:

O-H

Explanation:

It is polar covalent bond, because the hydrogen atom has electronegativity about 2.6, and the oxygen atom, electronegativity about 3.6. When the difference in electronegativity of the atoms is between 0.4 and 1.7, the result is a polar covalent bond.

Answer: distance to epicenter: 7600 km, s-wave travel time: 20 minutes

Bubbling and color changes indicates the occurring of a chemical reaction but does not indicate precipitation formation.

In Chemistry, when two supersaturated solutions are mixed together, precipitation refers to the formation of an undissolved solid that settles down at the bottom of the container.

In a precipitation reaction, the solution becomes colloidal i.e. a cloudy liquid is formed.

On the other hand, when a chemical reaction takes place bubbling occurs.

Other significant signs of a precipitation reaction include change in energy and temperature, formation of gas bubbles and precipitate formation and color change also happens.

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Yes, a precipitate is likely to form for the given aqueous solution because Q is greater than Ksp. The precipitate of PbSO₄ is likely to form in this solution.

The expression Q refers to the ion product, which is calculated by multiplying the concentrations of the ions involved in the equilibrium reaction. In this case, Q = [Pb²⁺][SO₄²⁻] = (0.0120 M)(1.52 x 10⁻⁵M) = 1.82 x 10⁻⁷. Since Q is greater than Ksp (1.82 x 10⁻⁷ > 1.82 x 10⁻⁸), the system is not at equilibrium and more solid PbSO₄ will continue to form until Q = Ksp.

Comparing Q with the solubility product constant (Ksp) of PbSO₄, which is 1.82 x 10⁻⁸, we find that Q is greater than Ksp (1.82 x 10⁻⁷ > 1.82 x 10⁻⁸). This indicates that the system is not at equilibrium and the solution is supersaturated with respect to PbSO₄.

As a result, more solid PbSO₄ will continue to form until the ion product (Q) equals the solubility product constant (Ksp). This leads to the formation of a precipitate of PbSO₄ in the solution. Therefore, based on the comparison of Q and Ksp, it is likely that a precipitate of PbSO₄ will form in the given aqueous solution.

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By using stoichiometry and considering the molar ratios from the balanced chemical equation, we find that reacting 15.8 g of H2 with excess oxygen will produce 141 g of water. 141 g.option A.

In the balanced chemical equation 2H2 + O2 → 2H2O, it is stated that two moles of hydrogen gas (H2) react with one mole of oxygen gas (O2) to produce two moles of water (H2O). Since the molar mass of water is approximately 18 g/mol, we can calculate the amount of water produced by converting the mass of hydrogen gas to moles and then using the mole ratio from the balanced equation.

To find the moles of hydrogen gas, we divide the given mass (15.8 g) by the molar mass of hydrogen (2 g/mol), which gives us 7.9 moles of H2. According to the balanced equation, each mole of H2 produces two moles of H2O. Therefore, 7.9 moles of H2 will produce 2 * 7.9 = 15.8 moles of H2O.

Finally, we convert the moles of water to grams by multiplying the moles (15.8) by the molar mass of water (18 g/mol), which gives us 284.4 g. However, we need to remember that the given reaction has excess oxygen, meaning all the hydrogen will react. Therefore, the limiting reactant is not hydrogen but oxygen.

Consequently, the amount of water produced will be based on the number of moles of oxygen. Since there is excess oxygen, we can assume that the moles of oxygen consumed are equal to the moles of hydrogen reacted. Therefore, the correct answer is 15.8 moles * 18 g/mol = 141 g.option A.

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The Stork reaction between acetophenone and 3-buten-2-one can proceed via different mechanisms depending on the reaction conditions and the presence of catalysts or other reagents.

Additionally, the specific reaction conditions may affect the selectivity and yield of the desired product(s).

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Answer:

first theres the poliution  one of the biggest things thats starts global warming then theres recycle and non recycle because people mix there trash up when their not suppossed to.

Explanation:

The formation of lead(ii) chloride in the first part of experiment 1, the balanced chemical equation is. Pb (NO3)2 (aq) + 2 NaCl (aq) → PbCl2 (s) + 2 NaNO3 (aq).

The reaction, the physical states are. aq = aqueous (dissolved in water) s = solid for the formation of mercury(i) chloride in the fourth part of experiment 1, the balanced chemical equation is Hg2(NO3)2 (aq) + 2 NaCl (aq) → 2 Hecla (s) + 2 NaNO3 (aq) In this reaction, the physical states are aq = aqueous (dissolved in water) s = solid for the formation of silver chloride in the fourth part of experiment 1, the balanced chemical equation is AgNO3 (aq) + NaCl (aq) → AgCl (s) + NaNO3 (aq) In this reaction, the physical states are aq = aqueous (dissolved in water)  s = solid Note Mercury(I) chloride is also known as calomel, and it is a toxic chemical. Please handle it with care and dispose of it properly.

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There are approximately 12.7 grams of phosphorus in a 50-gram sample of aluminum phosphate.

To determine the number of grams of phosphorus in a 50-gram sample of aluminum phosphate, we need to know the molar mass and the chemical formula of aluminum phosphate.

The chemical formula for aluminum phosphate is AlPO4. It indicates that each molecule of aluminum phosphate contains one aluminum atom (Al), one phosphorus atom (P), and four oxygen atoms (O).

To calculate the molar mass of aluminum phosphate, we can add up the atomic masses of its constituent elements based on their stoichiometric ratios:

Molar mass of AlPO4 = (molar mass of Al) + (molar mass of P) + (4 * molar mass of O)

Using the periodic table, we can find the atomic masses of the elements:

Molar mass of Al = 26.98 g/mol

Molar mass of P = 30.97 g/mol

Molar mass of O = 16.00 g/mol

Now, let's calculate the molar mass of aluminum phosphate:

Molar mass of AlPO4 = (26.98 g/mol) + (30.97 g/mol) + (4 * 16.00 g/mol)

= 121.95 g/mol

The molar mass of aluminum phosphate is 121.95 g/mol.

To determine the number of grams of phosphorus in a 50-gram sample of aluminum phosphate, we need to calculate the mass fraction of phosphorus in the compound. The mass fraction is the ratio of the molar mass of phosphorus to the molar mass of aluminum phosphate.

Mass fraction of phosphorus = (molar mass of P) / (molar mass of AlPO4)

= (30.97 g/mol) / (121.95 g/mol)

≈ 0.254

Multiplying the mass fraction by the mass of the sample gives us the grams of phosphorus:

Grams of phosphorus = (mass fraction of phosphorus) * (mass of the sample)

= 0.254 * 50 g

≈ 12.7 g

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we need no of moles

\(\\ \tt\hookrightarrow PV=nRT\)

\(\\ \tt\hookrightarrow n=\dfrac{PV}{RT}\)

\(\\ \tt\hookrightarrow n=\dfrac{1}{273(8.314)}\)

\(\\ \tt\hookrightarrow n=1/2269.7=0.0004mol\)

No of molecules=No of moles×Avagadro no

\(\\ \tt\hookrightarrow 0.0004(6.023\times 10^{23})\)

\(\\ \tt\hookrightarrow 2.4\times 10^{20} molecules \)

Hi there!

Note: 1 mole of a any gas at ST and Pressure (273 K and 1 atm) occupies a volume of 22.4 dm^3

=> x mole of oxygen occupies 1.00 dm^3

Therefore, the mole of oxygen on 1.00 dm^3 is :

\(mole \: of \: oxygen = \frac{1.00 {dm}^{3} \times 1 \: mole}{22.4 \: dm^{3} } = 0.044642857 \: mole\)

Also note that Avogadros Constant says: 1 mole of any gas contains \(6.022 \times {10}^{23}\)molecules.

Hence, 0.044642857 mole of oxygen will contain :

\(0.044642857 \times 6.022 \times {10}^{23} = 2.69 \times {10}^{22} \: molecules\)

Therefore, \(2.69 \times {10}^{22} \: molecules \: are \: present \: in \: 1dm^{3} \: of \: oxygen \: at \: stp\)

The balanced chemical equation for the given reaction is 2H₂ + O₂ -----> 2H₂O. According to the equation, 2 moles of H₂ react with 1 mole of O₂ to produce 2 moles of H₂O. Therefore, the percent yield of water in this reaction is 84.3%.

The first step to finding the percent yield of water is to determine the theoretical yield, which is the amount of product that would be obtained if the reaction proceeded perfectly. From the given information, we can calculate the number of moles of H₂ and O₂ that react Moles of H₂ = 10.0 g / 2.016 g/mol = 4.96 mol Moles of O₂ = 10.0 g / 32.00 g/mol = 0.3125 mol Since the reaction occurs in a 2:1 ratio of H₂ to O₂, we can use the amount of O₂ to determine the limiting reactant 0.3125 mol O₂ x (2 mol H₂ / 1 mol O₂) = 0.625 mol H₂ Since we only have 0.625 mol of H₂ available, this is the limiting reactant. Using the stoichiometry of the balanced equation, we can calculate the theoretical yield of H₂O 0.625 mol H₂ x (2 mol H₂O / 2 mol H₂) x (18.015 g/mol H₂O) = 11.27 g H₂O Therefore, the theoretical yield of H₂O is 11.27 g. Now we can calculate the percent yield using the actual yield (9.5 g) and the theoretical yield (11.27 g) % Yield = (Actual Yield / Theoretical Yield) x 100 % Yield = (9.5 g / 11.27 g) x 100 % Yield = 84.3% Therefore, the percent yield of water in this reaction is 84.3%.

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EXPLANATION:

Ethanol is commonly known as ethyl alcohol, pure alcohol, grain alcohol, and most importantly it is known alcohol present in alcoholic beverages.

The chemical formula of ethanol is written below as

Ethanol is very soluble in water and also, it has many functions due to the presence of hydroxyl as the functional group.

The next thing is to draw the structure of ethanol

Ethanol act as a fuel because the ethanol molecule contains oxygen, it allows the engine to more completely combust the fuel.

Answer: Is it Conduction?

Explanation:

[ Diagram - refer to attachment ]

The option with the highest standard molar entropy at 25°C among Al(s), Al(l), and Al(g) is C) Al(g).

Entropy is defined as the degree of disorder or randomness in a system. The standard entropy of a substance, also known as the molar entropy, is the entropy of one mole of the substance under standard conditions (1 bar of pressure and 298 K of temperature).

The standard state of matter for a substance is the state of the substance at standard conditions (1 bar of pressure and 298 K of temperature).

So, the standard molar entropy for Al(s) is 28.3 J/mol·K, for Al(l) it is 33.2 J/mol·K, and for Al(g) it is 164.7 J/mol·K at 25°C. Hence, among the three options, Al(g) has the highest standard molar entropy at 25°C.

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We need to add 0.1 ml of media to the 0.5 ml of the original suspension to get a final count of 1 × 10⁵ cells/ml.

Common examples of suspensions include muddy water, blood, and paint. Suspensions can be separated by physical means, such as filtration or centrifugation, which separates the solid particles from the fluid.

To get a count of 1 × 10⁵ cells/ml, we need to dilute the original cell suspension by a factor of 5.

Since we are starting with 0.5 ml of the original suspension, we need to add 0.5 ml of media to get a final volume of 1 ml.

Therefore, the calculation for the volume of media to add would be:

(0.5 ml original suspension) × (1/5) = 0.1 ml

So we need to add 0.1 ml of media to the 0.5 ml of the original suspension to get a final count of 1 × 10⁵ cells/ml.

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Dimethylsulfoxide has the formula C2H6SO.Therefore, the correct answer is option D: 25.4.

Option D.

To determine the mass percent of carbon in this compound, we need to calculate the molar mass of the compound first. Molar mass is the sum of the atomic masses of all the atoms in the molecule. We can use the periodic table to obtain the atomic masses. For this compound, the molar mass will be:2 (atomic mass of carbon) + 6 (atomic mass of hydrogen) + 32 (atomic mass of sulfur + 16 (atomic mass of oxygen) = 78 g/molNext, we need to determine the mass of carbon in one mole of the compound. We can do this by multiplying the number of carbon atoms by the atomic mass of carbon. In this case, there are 2 carbon atoms in one mole of the compound. Therefore, the mass of carbon in one mole of the compound is:2 (number of carbon atoms) x 12.01 (atomic mass of carbon) = 24.02 g/molFinally, we can calculate the mass percent of carbon in dimethylsulfoxide using the formula:mass percent of carbon = (mass of carbon / total molar mass) x 100%Substituting the values we obtained:mass percent of carbon = (24.02 g/mol / 78 g/mol) x 100% = 30.77%Rounding to three significant figures gives us a final answer of 30.7%.

Option D.

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Answer:

it have been already balanced

2H2 + O2 = 2H2O.

The mass of 7.60 × 10²⁰ hydrogen peroxide molecules is 0.043 grams.

The mass of a substance can be calculated by multiplying the number of moles by the molar mass of the substance as follows:

mass = molar mass × no of moles

However, the number of moles of a substance can be calculated by dividing the number of molecules of a substance by Avogadro's number;

no of moles = 7.60 × 10²⁰ ÷ 6.02 × 10²³

no of moles = 1.26 × 10-³ moles

molar mass of hydrogen peroxide = 34g/mol

mass = 34g/mol × 0.00126 moles

mass = 0.043 grams

Therefore, 0.043 grams is the mass of the hydrogen peroxide.

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Answer:

Earth is tilted on its axis

Explanation:

Whenever Earth is tilted on its axis, the tilt of the earth's rotational axis causes Nigeria to have longer days in the summertime, beginning in June, compared to the winter period. The tilting of the earth also causes Nigeria to experience longer nights in the winter.

The earth’s axis of rotation is tilted at an angle of 23.5 degrees compared to the earth's orbital plane. Such tilting of the earth is what causes Nigeria to experience longer hours during the day in the summer when the Northern Hemisphere is titled toward the sun starting around June 20 or 21.

Based on the fact that the water and unknown sample formed a homogeneous solution, it is likely that the unknown compound is either polar or ionic.

Based on the information provided, the water and unknown sample formed a homogeneous solution. A homogeneous solution is one in which the solute (in this case, the unknown compound) is uniformly dispersed in the solvent (water) at a molecular level. To determine the most likely compound for the unknown sample, we need to consider the properties of the solution.

First, let's examine the properties of water. Water is a polar molecule, meaning it has a slightly positive charge on one end and a slightly negative charge on the other. This polarity allows water molecules to interact with other polar molecules, such as ionic compounds or other polar solvents.

If the unknown compound formed a homogeneous solution with water, it is likely that the unknown compound is also polar or ionic. This is because polar and ionic compounds can dissolve in water due to the attractive forces between their charged or polar molecules and water molecules. Examples of polar compounds that can dissolve in water include ethanol and sugar, while examples of ionic compounds that can dissolve in water include sodium chloride and potassium nitrate.

To determine the exact compound, we would need more information, such as its physical properties, chemical formula, or other identifying characteristics. Additionally, conducting tests, such as pH testing or spectroscopy, could help identify the unknown compound.

To determine the specific compound, further analysis and testing are necessary.

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