question is
P2O5 a ionic or covalent bond, its covalent right?

Both of the atoms in a given element are electrically neutral, but only one of them possesses a stable electronic state.

Given: Two distinct atoms with the same mass and four protons each are the subject of the question. However, one is positive while the other is neutral in terms of charge.

Since they both have the same nucleus but different charges, it may be inferred that they are both atoms of the same element, however one of them is electrically neutral and the other has a stable electronic configuration.

In other words, although both atoms of the same element are electrically neutral, only one of them has a stable electronic state.

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Answer: D. Solids made of molecules

Explanation:

Answer:

hi

Explanation:

hi

Answer:

malleable

Explanation:

The image represent in malleable property of metal.

The image possibly represents the photoelectric effect of a metal, which is when it emits electrons after being exposed to electromagnetic radiation. Metals are also characterized by physical properties such as conductivity, malleability, metallic luster, and metallic bonding.

Based on your question, the image possibly represents the photoelectric effect, a key property of metals. This phenomenon occurs when a metal surface exposed to electromagnetic waves of a certain frequency absorbs radiation and emits electrons. These emitted electrons are called photoelectrons. Metals can also exhibit free electron model behavior, where electrons freely roam within the metal structure.

Metals possess unique physical properties like conductivity, malleability, and metallic luster. Malleability refers to the metal's ability to deform without breaking, while conductivity refers to the metal's ability to transfer heat or electricity. A metallic luster gives metals their characteristic shiny appearance.

Finally, metals are also known for their metallic bonding—a unique force that holds together the atoms within a metallic solid. Metallic bonding gives rise to many useful and varied bulk properties of metals.

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Answer:

See explanation

Explanation:

If you look closely at the image attached, you will discover that the order of increasing wavelength in the visible spectrum is;

violet < indigo< blue < green < yellow < orange < red

On the order hand, the energy of the photons increases in the order;

Red < orange < yellow < green < blue < indigo < violet

Since energy follows a trend opposite to that of wavelength, we can see that the greater the wavelength of light, the lower the energy of photon corresponding to that particular colour.

Concentrations of O₂ and CO₂ in inhaled air compare with exhaled air when inhaled will have more oxygen and less carbon dioxide and when exhaled air have more carbon dioxide and less oxygen

Respiration is the act of respiring inhalation and exhalation of air and also called breathing and respiration also described as human take in oxygen and release carbon dioxide and this oxygen that is taken in by the cells is used for carrying various functions in the cell and is also used for deriving energy from the food and inhaled air is the oxygen rich and this air is important for the requirement of energy and exhaled air is the air that breath out which is waste air carbon dioxide which is not require for the body

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The American Heart Association recommends that linoleic acid should make up 5-10% of total daily calories.

linoleic acid is an essential omega-6 fatty acid that the body cannot produce on its own and must be obtained through the diet. It plays a crucial role in maintaining overall health, particularly in relation to heart health.

The American Heart Association (AHA) recommends that linoleic acid should make up 5-10% of total daily calories. This recommendation is based on the beneficial effects of linoleic acid on heart health. Studies have shown that consuming an adequate amount of linoleic acid can help lower the risk of cardiovascular diseases.

Linoleic acid is found in various plant-based oils, such as soybean oil, sunflower oil, and corn oil. These oils can be used in cooking or as dressings for salads and other dishes.

It is important to note that while linoleic acid is beneficial, the overall balance of fatty acids in the diet is also crucial for optimal health. It is recommended to consume a variety of healthy fats, including omega-3 fatty acids, in addition to linoleic acid.

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Answer:

¹₀P

Explanation:

 Nuclear reaction:

                ⁹₄Be  + ⁴₂He  → ¹²₆C + ?

To balance this equation, as with other combining specie, the mass number on both sides of the expression must be the same. Also, the atomic number must be the same.

   Let us represent the unknown by X;

          ⁹₄Be  + ⁴₂He  → ¹²₆C + ᵇₐX

 Now;

  Sum of mass number;

            9 + 4 = 12 + b

               13 = 12 + b

                    b = 1

   Sum of atomic number;

             4 + 2  = 6 + a

               a = 0

So the specie is a position ¹₀P

Answer: The answer to your question is 7.06 x 10^22 atoms make up 3.29 g of silicon.

Hope this helps!

Answer:

1398.4

Explanation:

Use a calculator

Honestly didnt even need to

The characteristics and the type of molecular bond they describe:

1. Bonds found in Halite (between Na⁺ and Cl⁻): Ionic bond

2. Bonds found between Si and O in the Si-O tetrahedron: Covalent bond

3. Bonds inside the water molecule (between the H and O): Covalent bond

4. Bonds that exist between two water molecules: Hydrogen bond

5. Strongest bond type: Covalent bond

6. Weakest bond type: Van der Waals bond

7. Bonds that are used by water to dissolve salt: Ionic bond

The ionic bond is a type of molecular bond found in halite (between Na⁺ and Cl⁻). The Si-O tetrahedron is held together by a covalent bond. The bond inside the water molecule (between the H and O) is also a covalent bond. The hydrogen bond is the type of bond that exists between two water molecules. The covalent bond is the strongest bond type, while the van der Waals bond is the weakest bond type. Water uses the ionic bond to dissolve the salt.

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In any aqueous solution at 25°C, the ionic-product of water (Kw) is a constant value equal to 1.0 x 10⁻¹⁴ mol²/L².

Due to the auto-ionization or self-ionization of water, water molecules dissociate into hydronium ions (H₃O⁺) and hydroxide ions (OH⁻). At 25°C, the Kw is equal to 1.0 x 10⁻¹⁴ mol²/L².

This constant value of Kw plays a crucial role in understanding the acidity and basicity of aqueous solutions. It helps to establish the relationship between the concentrations of hydronium and hydroxide ions, as their product remains constant at a given temperature. The pH and pOH scales are derived from this relationship, providing a convenient method for measuring the acidity or basicity of a solution.

In summary, the ionic-product of water, Kw, remains constant at 1.0 x 10⁻¹⁴ mol²/L² for any aqueous solution at 25°C. This constant is a result of the auto-ionization of water and helps to understand the relationship between hydronium and hydroxide ions in the context of acidity and basicity.

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Answer:

Weak; a lot of potential energy.

Explanation:

Carbon-carbon covalent bonds, such as the ones in carbohydrates and lipids, are weak and have potential energy.

In chemistry, a covalent bond is a chemical connection between two ions or atoms in which their respective electron pairs are shared. A molecular bond is another name for a covalent link.

Several other chemical species, including radicals and macromolecules, may also include this kind of connection. Irving Langmuir invented the term "covalence" around 1919 to characterize the quantity of electron pairs exchanged by nearby atoms, but the phrase "covalent bond" wasn't used until 1939. Carbon-carbon covalent bonds, such as the ones in carbohydrates and lipids, are weak and have potential energy.

Therefore, carbon-carbon covalent bonds, such as the ones in carbohydrates and lipids, are weak and have potential energy.

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Answer:

glucose and fructose

Explanation:

Sucrose is a disaccharide (a kind of sugar made of two monosaccharides) made of glucose and fructose

The number of particles of water that exist in a closed test tube after the water vaporizes and turns into a gas will be the same as the number of particles before the phase change.

This is because during the phase change, the molecules of water simply change their state from liquid to gas.the phase change from liquid to gas does not involve any change in the number of molecules, only a change in the physical state of the molecules.  The molecules do not disappear or gain additional molecules from outside the test tube. As such, the number of particles of water in the test tube after the phase change is the same as before the phase change.

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Answer:

0.76moles of sucrose

Explanation:

1 mol = 6.022 x 10^23 molecules

4.6 x 10^23 molecules = X x 6.022 x 10^23

X = 0.7639

X = 0.76moles

Cal needs to add 24.9 mL of 0.374 M Ba(OH)₂ solution to reach the equivalence point.

The balanced chemical equation for the reaction between HBr and Ba(OH)₂ is:

2HBr + Ba(OH)₂ → 2H₂O + BaBr₂

From the equation, we can see that the stoichiometric ratio of HBr to Ba(OH)₂ is 2:1. This means that for every 2 moles of HBr, we need 1 mole of Ba(OH)₂ to reach the equivalence point.

First, we can calculate the number of moles of HBr in the solution:

moles of HBr = volume of HBr solution (in L) × molarity of HBr

moles of HBr = 0.0536 L × 0.348 mol/L

moles of HBr = 0.0186368 mol

Since the stoichiometric ratio of HBr to Ba(OH)₂ is 2:1, we need half as many moles of Ba(OH)₂ to reach the equivalence point:

moles of Ba(OH)₂ = 0.0186368 mol ÷ 2

moles of Ba(OH)₂ = 0.0093184 mol

Finally, we can use the definition of molarity to calculate the volume of Ba(OH)₂ solution needed:

moles of Ba(OH)₂ = volume of Ba(OH)₂ solution (in L) × molarity of Ba(OH)₂

0.0093184 mol = volume of Ba(OH)₂ solution (in L) × 0.374 mol/L

volume of Ba(OH)₂ solution = 0.0093184 mol ÷ 0.374 mol/L

volume of Ba(OH)₂ solution = 0.0249 L or 24.9 mL

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Answer:

A. teeth

Explanation:

It contains a protien called collagen, which absorbs chemical elements from the food that an individual eats, so scientists are able to obtain information about animals diet by studying the chemical elements found in fossilised teeth.

Answer:

Teeth

Explanation:

They can see the shape of the teeth and try to figure out what they ate

The mass of ZnCl2 that can be produced is 0.496 g.

The balanced equation for the reaction between zinc (Zn) metal and hydrochloric acid (HCl) is: Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)

The molar mass of Zn is 65.38 g/mol and the molar mass of ZnCl2 is 136.29 g/mol.

To determine the mass of ZnCl2 that can be produced from 0.238 g of Zn, we need to use stoichiometry.

To do this:

First, convert the given mass of Zn to moles by dividing by its molar mass: 0.238 g Zn × (1 mol Zn/65.38 g Zn) = 0.00364 mol Zn

Since the balanced equation shows that 1 mole of Zn reacts with 1 mole of ZnCl2, then the number of moles of ZnCl2 produced will be the same as the number of moles of Zn.

Thus,0.00364 mol ZnCl2 will be produced from 0.238 g Zn.

To convert the moles of ZnCl2 to grams, we multiply by its molar mass:0.00364 mol ZnCl2 × 136.29 g ZnCl2/mol ZnCl2 = 0.496 g ZnCl2

Therefore, the mass of ZnCl2 that can be produced is 0.496 g.

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No methane gas is needed to boil the water as the negative volume (-254 L) indicates that the combustion of methane will produce enough heat to boil the water.

To calculate the volume of natural gas needed to boil the water, we need to consider the heat generated by the gas and the fraction of that heat that goes towards heating the water.

First, let's convert the volume of water from liters to milliliters: 19.5 L = 19500 mL.

Next, we need to calculate the heat required to raise the temperature of the water. The formula for heat is Q = m * c * ΔT, where Q is the heat, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature.

The mass of the water can be calculated using the density:

m = density * volume. In this case, m = 1.00 g/mL * 19500 mL = 19500 g.

The specific heat capacity of water is approximately 4.18 J/g°C.

The change in temperature is the final temperature (100°C) minus the initial temperature (22.9°C): ΔT = 100°C - 22.9°C = 77.1°C.

Now we can calculate the heat required: Q = 19500 g * 4.18 J/g°C * 77.1°C = 6094842 J.

Since only 14.9% of the heat generated goes towards heating the water, we can find the total heat generated by dividing the heat required by 14.9%:

Total heat = Q / 0.149 = 6094842 J / 0.149

= 40987785 J.

Now we can find the volume of natural gas needed by dividing the total heat by the enthalpy of formation of gaseous water. The enthalpy of formation for gaseous water is -241.8 kJ/mol or -241800 J/mol.

The number of moles of gaseous water formed can be found by dividing the total heat by the enthalpy of formation: Moles of gaseous water = Total heat / enthalpy of formation = 40987785 J / -241800 J/mol = -169.7 mol.

Since the combustion of methane produces one mole of gaseous water per mole of methane, the volume of methane needed can be calculated by dividing the moles of gaseous water by the density of methane:

Volume of methane = Moles of gaseous water / density of methane

= -169.7 mol / 0.668 g/L

= -254 L.

However, we cannot have a negative volume of methane, so the answer is that no methane is needed to boil the water.

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Answer:

1.67g/cm3

Explanation:

The formula for density is \(d=\frac{m}{v}\) . The m variable stands for mass and the v variable stands for volume.

The mass of the brown sugar is 10.0g and the volume is 6.0cm3, so we can plug those values into the equation.

\(d=\frac{10g}{6cm^{3} }\)

\(d=1.67\)\(\frac{g}{cm^{3} }\)

Rounded to 3 significant figures, the density of the block of brown sugar is 1.67 g/cm3. If the mass is in grams and the volume is in cm3, the unit for the final answer is \(\frac{g}{cm^{3} }\) (grams per centimetres cubed).

Answer:

16g

Explanation:

Answer:

it is in solid state

Explanation:

at 100% heat

At regular intervals, check the stearic acid's temperature. Make a note of the findings and create a temperature vs time graph.

The physical concept of temperature indicates in numerical form how hot or cold something is. A thermometer is used to determine temperature. Thermometers are calibrated using a variety of temperature scales, which historically defined distinct reference points and thermometric substances.

For above given example, check the temperature of the stearic acid often and make a note of the results and plot the temperature against time.

Temperature is not the same as the energy of a thermodynamic system; for instance, an iceberg has a significantly larger total heat energy than a match, despite the fact that a match is burning at a much higher temperature.

Thus, at regular intervals, check the stearic acid's temperature. Make a note of the findings and create a temperature vs time graph.

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Considering the definition of empirical formula, the empirical formula is C₃H₈.

The empirical formula is the simplest expression to represent a chemical compound, which indicates the elements that are present and the minimum proportion in whole numbers that exist between its atoms, that is, the subscripts of chemical formulas are reduced to the most integers. small as possible.

In this case, in first place you know the percent composition:

Assuming a 100 grams sample, the percentages match the grams in the sample. So you have 81.71 grams of carbon and 18.29 grams of hydrogen H.

Then it is possible to calculate the number of moles of each atom in the molecule, taking into account the corresponding molar mass:

The empirical formula must be expressed using whole number relationships, for this the numbers of moles are divided by the smallest result of those obtained. In this case:

To express this relationship in the form of simple integers, it is necessary to multiply by a simple number to achieve this:

Therefore the C: H mole ratio is 3: 8

Finally, the empirical formula is C₃H₈.

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Answer:

The mass of gas is 30.02 g.

Explanation:

Given data:

Volume of gas = 22.4 L

Density of gas = 1.34 g/L

Mass of gas = ?

Solution:

The given problem will be solved through density formula.

Density is equal to the mass of substance divided by its volume.

Units:

SI unit of density is Kg/m3.

Other units are given below,

g/cm3, g/mL , kg/L

Formula:

D=m/v

Now we will put the values in formula.

1.34 g/L = m /22.4 L

m = 1.34 g/L × 22.4 L

m = 30.02 g

The mass of gas is 30.02 g.

Answer:

\(\boxed {\boxed {\sf 81.4 \ g\ KOH}}\)

Explanation:

We are asked to convert 1.45 moles of potassium hydroxide (KOH)  to grams.

The molar mass is the mass in grams of 1 mole of a substance. The values are found on the Periodic Table. They are the same as the atomic masses but the units are grams per mole (g/mol) instead of atomic mass units (amu).

We have the compound KOH. Look up the molar masses of the individual elements.

The formula for the compound has no subscripts, so there is 1 mole of each element in 1 mole of the compound. We can simply add the molar masses.

Based on the molar mass, there are 56.105 grams of KOH in 1 mole. Create a ratio using this information.

\(\frac {56.105 \ g\ KOH}{ 1 \ mol \ KOH}\)

We are converting 1.45 moles of KOH to grams, so we multiply by this value.

\(1.45 \ mol \ KOH *\frac {56.105 \ g\ KOH}{ 1 \ mol \ KOH}\)

The units of moles of KOH cancel.

\(1.45\ *\frac {56.105 \ g\ KOH}{ 1 }\)

\(81.35225 \ g\ KOH\)

The original measurement of moles has 3 significant figures, so our answer must have the same.

For the number we calculated, that is the tenths place. The 5 in the hundredths place (81.35225) tells us to round the 3 up to a 4.

\(81.4 \ g\ KOH\)

Approximately 81.4 grams of potassium hydroxide are represented by 1.45 moles.

Answer:

i think the answer is C

Explanation:

if wrong im sorry

Answer:

C

Explanation:

Answer:

Neither of these changes are caused by cooling, but both are chemical changes.