Which statement about sound waves is true?
They can be reflected.
Air travels with them
They travel throughoven
They exist only if heard

Our body goes to its second energy source by breaking down simple sugars called Monosaccharides.

Monosaccharides are also known as simple sugars. It is the simplest form of sugars that means they cannot be broken down by hydrolysis into simpler sugars. It is used as building blocks to form complex sugars.

Examples of Monosaccharides are Glucose, Fructose, Galactose etc.

The structure of Monosaccharides is (CH₂O)ₙ. It consist single unit chain. Monosaccharides used to store energy and produce energy.

Thus from the above conclusion we can say that Our body goes to its second energy source by breaking down simple sugars called Monosaccharides.

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Dipole-dipole forces and hydrogen bonds are two examples of intermolecular forces.What are intermolecular forces?Intermolecular forces (IMFs) are forces that act between molecules.

The intermolecular force is the force that causes two molecules to attract or repel each other. These forces hold the particles together in a solid or a liquid. If the intermolecular forces are weak, then the substance is more likely to be in a gas state, as the molecules can move freely. If the intermolecular forces are strong, then the substance will be more likely to be in a solid state, as the molecules will be more tightly packed together.What are the two examples of intermolecular forces?Two examples of intermolecular forces are dipole-dipole forces and hydrogen bonds. Dipole-dipole forces occur between polar molecules, where there is a separation of positive and negative charges.

These forces are weaker than chemical bonds but stronger than London dispersion forces, which are a type of van der Waals force.Hydrogen bonds are a type of dipole-dipole force that specifically occurs between hydrogen atoms bonded to highly electronegative atoms such as nitrogen, oxygen, or fluorine. Hydrogen bonds are stronger than dipole-dipole forces, but still weaker than chemical bonds. They are responsible for many of the unique properties of water, such as its high boiling point and surface tension.

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Answer:

Newspaper

Explanation:

Edge

Answer:

The answer is Newspaper on edge

Explanation:

Hes correct

When NH₄OH and CaS are mixed the following reaction occurs:

NH₄OH + CaS ---> Ca(OH)₂ + (NH₄)₂S

Ca(OH)₂ is a poorly soluble base in water. So the formula of the precipitade formed is Ca(OH)₂ and its name is calcium hydroxide.

Bases with cations of the group II of the periodic table are generally poorly soluble in water.

It is difficult to draw a conclusive statement about the pHs of different categories of common substances because the pH of a substance is dependent on its specific composition. However, it is possible to make generalizations about certain categories of substances.

The pH of beverages can vary widely depending on their composition. Some common beverages such as water, milk, and pure fruit juices tend to have a pH close to neutral (pH 7). Other beverages such as carbonated soft drinks, energy drinks, and sports drinks tend to be acidic (pH less than 7) due to the presence of acids such as citric acid, phosphoric acid, and carbonic acid. Alkaline water and some herbal teas may have a pH greater than 7.

For example, acidic beverages are substances often associated with a higher risk of dental erosion and may be more likely to cause stomach discomfort in some individuals. On the other hand, alkaline beverages may have potential health benefits, but further research is needed to fully understand their effects on the body.

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

The empirical formula, which specifies the elements that are present and the minimal proportion in whole numbers that exist between its atoms—that is, the subscripts of chemical formulas are reduced to the most integers—is the simplest statement to represent a chemical compound. as little as feasible.

Percent composition:

C: 81.71 %

H: 18.29%

In a 100 grams sample, you have 81.71 grams of carbon and 18.29 grams of hydrogen H.

C = 6.81 moles

H = 18.29 moles

To express this relationship in the form of simple integers

C: H mole ratio is 3: 8

Finally, the empirical formula is C₃H₈.

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Answer:

Explanation:

First off, you need to find the number of moles of iron oxide (Fe2O3) present in 480kg. The equation is mol = mass (g) / Mr

- you're given the mass of Fe2O3 in kg, so just need to covert to g; = 480 x 1000 = 480,000g

- Mr of Fe2O3 is found by adding all relative atomic masses from the Periodic Table;

2 x Fe = 2 x 56 = 112

3 x O = 3 x 16 = 48, therefore Mr of Fe2O3 = 112 + 48 = 160

- now divide the mass by the Mr to find mol Fe2O3 = 480,000 / 160 = 3000 mol

You know from the equation that 3 x CO reacts with Fe2O3, so you multiply number of Fe2O3 mol x 3 = 9000 mol

Now you need to find mass of CO; based on the formula mol = mass (g) / Mr, you can rearrange this to make mass the subject; mass (g) = mol x Mr

Mr of CO = 12 + 16 = 28

Therefore mass CO (g) = 9000 x 28 = 252,000g (or 252kg).

The mass of carbon monoxide needed to react with 480kg of iron oxide comes out to be  252kg. This calculation can be done using stoichiometry concept.

Stoichiometry is a part of chemistry that help us in making relationship between reactant and product from quantitative aspects.

The balanced equation is

\(Fe_{2} O_{3} +3CO\rightarrow 2Fe+3CO_{2}\)

The molar ration of Ferric oxide to Carbon monoxide is 1:3

Moles of carbon monoxide= 3×moles of Ferric oxide

                                            =3(given mass ÷ Molar mass)

                                            =3[(480 x 1000)÷{(2 x 56)+(3 x 16 )}]

                                             =9000 mole

Mass of Carbon monoxide=molar mass of Carbon monoxide×Moles of                carbon monoxide

                                              =(12 + 16)×9000 mole

                                              =252,000g

                                             = 252kg

Thus mass of carbon monoxide is 252kg.

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Answer:

D. I think

.........mm..

We use Big O notation to describe the upper bound of a function in terms of its input size.

The order of inserting an element into a sorted list of size N implemented using array is O(N).

What is the order of inserting an element into a sorted list of size N implemented using array?

The order of inserting an element into a sorted list of size N implemented using array is O(N).

What is the formula for calculating Big O notation?

The Big O notation formula is O(g(n)) where g(n) is the rate of growth of the function in the equation.

In other words, we use Big O notation to describe the upper bound of a function in terms of its input size.

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The reaction performed with the elephant toothpaste demonstration is known as a decomposition reaction.

The process of breaking down a chemical compound into smaller molecules, atoms, or ions is known as a decomposition reaction. It is also known as analysis or disintegration. A reaction in which a single substance is broken down into two or more simpler substances is known as a decomposition reaction. The elephant toothpaste demonstration is a simple chemical reaction in which hydrogen peroxide breaks down into oxygen gas and water in a matter of seconds.

The formula for hydrogen peroxide is H₂O₂. It is a pale blue liquid that contains hydrogen, oxygen, and water. When you add yeast, soap, and food coloring, the reaction is more exciting. The yeast acts as a catalyst, breaking down hydrogen peroxide into water and oxygen gas. The oxygen gas created causes the soap to foam up, creating the "elephant toothpaste" effect. The chemical reaction that takes place during the elephant toothpaste demonstration can be written as follows:

2H₂O₂(liquid) → 2H₂O (liquid) + O₂ (gas)

This reaction is an example of a decomposition reaction.

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Answer:

Two of the three salts are soluble.

One of the three salts is soluble.

Explanation:

One or two of the three salts would be soluble in water depending on if the water is cold or hot.

According to the solubility rules of chloride salts, all chlorides are soluble in cold water except for those of silver (Ag), lead (Pb), and mercury (I) (Hg).

This thus means that both AgCl and \(PbCl_2\) would be insoluble in cold water while LiCl would be soluble.

\(PbCl_2\) is, however soluble in hot water.

Hence, in cold water, one of the three salts (LiCl) would be soluble, while in hot water, two of the three salts (LiCl and \(PbCl_2\)) would be soluble.

Peptide bonds were amide connections among two amino acids' -carboxyl and -amino groups.

Body protein as well as other vital ammonia substances including creatine, peptidases, and some neurotransmitters can indeed be produced sans amino acids. Although limitations are expressed in terms of protein, amino acids are indeed a biological necessity.

The building and repair of tissue, the production and operation of enzymes, food digesting, the movement of molecules, and other biological and chemical activities in many sections in our body all depend on amino acids.

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Chromatography is a widely used analytical technique that separates and identifies the various components of a mixture. The two essential components of any chromatography experiment are the stationary phase and the mobile phase.

The stationary phase refers to the material that is fixed in place and does not move during the experiment. This phase is often a solid or a liquid that is coated onto a solid support such as a column or a plate. The mobile phase, on the other hand, is the liquid or gas that moves through the stationary phase and carries the sample to be analyzed. The mobile phase is usually a solvent that has a different polarity than the stationary phase, allowing the components of the mixture to be separated based on their affinity to the stationary phase. In summary, the two essential components of any chromatography experiment are the stationary phase and the mobile phase, and these components play a crucial role in separating the various components of a mixture and identifying them.

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The balanced chemical equation for the given reaction is:Ca3(PO4)2 + 3H2SO4 → 3CaSO4 + 2H3PO4 Now, the molar mass of Ca3(PO4)2 is 310.18 g/mol and that of H3PO4 is 97.99 g/mol. If 23.9 g of Ca3(PO4)2 is reacted with an excess of H2SO4.

The amount of H3PO4 formed is:2 moles of H3PO4 are produced by 1 mole of Ca3(PO4)2.If the amount of H3PO4 produced is 13.4 g, then the number of moles of H3PO4 produced is:

n = (13.4/97.99)

= 0.1368 mol

Theoretical yield of H3PO4

= 2 x 0.1368

= 0.2736 mol The balanced equation shows that 3 moles of H2SO4 are required to react with 1 mole of Ca3(PO4)2. Therefore, 3 x 310.18 = 930.54 g of H2SO4 is required to react with 310.18 g of Ca3(PO4)2.

Now, if 23.9 g of Ca3(PO4)2 reacts with excess H2SO4, then the amount of H2SO4 consumed is: Mass of H2SO4 consumed = (23.9/310.18) x 930.54 g

= 71.47 g Actual yield of H3PO4 is given as 13.4 g. Therefore, the percentage yield of H3PO4 can be calculated as follows:

Percentage yield = (Actual yield/Theoretical yield) × 100

= (13.4/0.2736) × 100

= 4899.27%

When the unbalanced chemical equation provided in the question is balanced we get:Ca3(PO4)2 + 3H2SO4 → 3CaSO4 + 2H3PO4 Here, 1 mole of Ca3(PO4)2 produces 2 moles of H3PO4. Therefore, 930.54 g of H2SO4 is required to react with 310.18 g of Ca3(PO4)2.

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The Hall coefficient (RH) in this case is approximately -3.01 * 10^-6 C^-1 cc (rounded to three significant figures in exponential notation).

The Hall coefficient (RH) is a parameter used to describe the behavior of charge carriers in a material when subjected to a magnetic field. It is given by the equation RH = 1/(e * p) where e is the elementary charge and p is the total charge carrier density. In this case, we are given the acceptor doping concentration (Na) and the donor doping concentration (Nd) in units of /cc.

To calculate the Hall coefficient, we need to determine the total charge carrier density (p). The total charge carrier density can be calculated as the difference between the acceptor doping concentration and the donor doping concentration: p = Na - Nd.

Given the acceptor doping concentration Na = 4.18 * 10^15/cc and the donor doping concentration Nd = 9.40 * 10^15/cc, we can substitute these values into the equation to find p:

p = Na - Nd
  = (4.18 * 10^15/cc) - (9.40 * 10^15/cc)
  = -5.22 * 10^15/cc

Now, we can substitute the value of p into the Hall coefficient equation:

RH = 1/(e * p)
    = 1/(1.60 * 10^-19 C * (-5.22 * 10^15/cc))
    = -3.01 * 10^-6 C^-1 cc

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Answer:

Final temperature, T2 = 381.28°C

Explanation:

Given the following data;

Mass = 6.23 g

Initial temperature = 30.4°C

Heat capacity = 282 J

Specific heat capacity = 0.129 J/g°C

To find the final temperature;

Heat capacity is given by the formula;

\( Q = mcdt\)

Where;

Q represents the heat capacity or quantity of heat.

m represents the mass of an object.

c represents the specific heat capacity of water.

dt represents the change in temperature.

Making dt the subject of formula, we have;

\( dt = \frac {Q}{mc} \)

Substituting into the equation, we have;

\( dt = \frac {282}{6.23*0.129} \)

\( dt = \frac {282}{0.8037} \)

dt = 350.88°C

Now, the final temperature T2 is;

But, dt = T2 - T1

T2 = dt + T1

T2 = 350.88 + 30.4

Final temperature, T2 = 381.28°C

Answer: 7.7 * 10^-2

Explanation:

It's number 1 only, the rest are irrelevant

Due to its polar covalent connection with hydrogen, oxygen has a partial negative charge. One oxygen atom is joined to two hydrogen atoms to form the water molecule.

Since oxygen has a higher electronegative polarity than hydrogen, it attracts the covalent bond's electrons to its nucleus. All of the atoms involved acquire a dipole, a partial charge.

The hydrogen atoms acquire a positive dipole because oxygen draws the electrons closer, creating a negative dipole for it. The propensity of an atom to absorb electrons is known as electronegativity.

Oxygen desperately needs two more electrons to complete its valence shell. Although they have a lower electronegativity than oxygen, the hydrogen atoms in H2O are nevertheless fairly electronegative. Due to their electronegativity, the hydrogen atoms offer their single electron in exchange for sharing the electrons of the oxygen atom.

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The azimuthal quantum number provides information about the shape and angular distribution of an electron's orbital in an atom.

What information does azimuthal number provide?

The azimuthal (subsidiary) quantum number, also known as the angular momentum quantum number (l), provides information about the shape and angular distribution of an electron's orbital in an atom.

The value of the azimuthal quantum number can range from 0 to (n-1), where n is the principal quantum number. The value of l determines the type of orbital occupied by the electron, with different values of l corresponding to different shapes of the orbital. The four types of orbitals are s, p, d, and f orbitals.

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For a solution with pOH = 4.74, the hydrogen ion concentration is approximately 1.51 × 10^(-9) M, and for a solution with pOH = 6.62, the hydrogen ion concentration is approximately 2.22 × 10^(-8) M. option A

To calculate the hydrogen ion concentration (also known as the hydronium ion concentration) from the pOH value, we can use the relationship:

pOH = -log[OH-]

where [OH-] represents the hydroxide ion concentration.

To find the hydrogen ion concentration ([H+]), we need to use the relationship:

[H+] × [OH-] = 1.0 × 10^(-14) at 25°C

Taking the negative logarithm of both sides, we get:

-log[H+] - log[OH-] = -log(1.0 × 10^(-14))

Since pOH = -log[OH-], we can rewrite the equation as:

-log[H+] - pOH = 14

Now, we can rearrange the equation to solve for [H+]:

-log[H+] = 14 + pOH

[H+] = 10^(-pH)

Using this equation, we can calculate the hydrogen ion concentration for each given pOH value:

A) pOH = 4.74

[H+] = 10^(-(14 + 4.74))

[H+] ≈ 1.51 × 10^(-9) M

B) pOH = 6.62

[H+] = 10^(-(14 + 6.62))

[H+] ≈ 2.22 × 10^(-8) M

option A

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Answer:

5 H atoms per NH4OH

Explanation:

5NH4OH

NH4OH is a chemical formula.  It has 5 H atoms per each molecule.  NH4OH

5NH4OH means 5 molecules (or moles) of NH4OH.  But the question asks per chemical formula, so 5 is correct,

There would be 5x4 or 20 atoms of H is 5 molecules of NH4OH.

The mass of 6.45 x 10^25 atoms of Cu is 682.3 grams. For example, the atomic weight of carbon is 12.011, so the molar mass of carbon is 12.011 g/mol.

What is Molar Mass?

Molar mass is the mass of one mole of a substance, expressed in grams per mole (g/mole). It is a fundamental concept in chemistry and is used in various calculations, such as determining the mass of a sample of a substance, the number of moles in a sample, or the number of atoms or molecules in a sample.

The molar mass of an element is equal to its atomic weight, which is the weighted average of the masses of all the isotopes of that element, taking into account their relative abundance.

Determine the number of moles of Cu atoms:

6.45 x 10^25 atoms Cu x (1 mole Cu / 6.022 x 10^23 atoms Cu) = 10.73 mol Cu

Use the molar mass of Cu to convert from moles to grams:

10.73 mole Cu x (63.55 g Cu / 1 mole Cu) = 682.3 g Cu

Therefore, the mass of 6.45 x 10^25 atoms of Cu is 682.3 grams.

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With the pH of 6, this would give an equilibrium concentration of copper ion of 0.30 mg/l.

The pH of a solution containing 0.5 mg/l of copper ion (Cu2+) dissociated from Cu(OH)2 at equilibrium can be measured using a pH meter. If the pH of the solution is adjusted to 6 and 10, the concentrations of copper ion in mg/l at equilibrium can be calculated.

To calculate the concentration of copper ion at pH 6, the following equation can be used:

[Cu2+] = 0.5 x 10^(-6pH + 11.5)

With the pH of 6, this would give an equilibrium concentration of copper ion of 0.30 mg/l.

To calculate the concentration of copper ion at pH 10, the following equation can be used:

[Cu2+] = 0.5 x 10^(-6pH + 11.5)

With the pH of 10, this would give an equilibrium concentration of copper ion of 0.01 mg/l.

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Answer:

Fe(OH)2 + 2HCl ---> FeCl2 + 2H2O

I think

Answer:

order of increasing relative atomic mass