Which sentence describes a limitation of this model of the solar system? O A. It does not show the real distances between the planets. B. It shows that the solar system has eight planets. C. It does not show that the planets are different sizes D. It shows each planet at a different distance from the Sun.​

Answer:

noun. the composite or generally prevailing weather conditions of a region, as temperature, air pressure, humidity, precipitation, sunshine, cloudiness, and winds, throughout the year, averaged over a series of years. a region or area characterized by a given climate: to move to a warm climate.

Explanation:

Answer:

The melting and boiling points of molecular compounds are generally quite low compared to those of ionic compounds. This is because the energy required to disrupt the intermolecular forces between molecules is far less than the energy required to break the ionic bonds in a crystalline ionic compound (Figure 6.2. 1) .

Explanation:

hopefully this helps :)

if not then here. (Most of the time, the melting points of ionic compounds are very high compared to the melting points of molecular compounds.)

Answer: A. Molecular compounds tend to have lower melting points

Explanation:

These are some of the important functions of the cytokinesis hormone in plants :-

Cytokinesis is a group of growth regulators that is found in plants. It helps in performing cell divison of plant roots, and shoot system. It also helps in promoting the cell's growth, development, flowering, and seed formation.

It helps in the protein production which is important for mitosis. It provides resistance against certain diseases causing bacteria in crops. It mainly contains Nitrogen, Hydrogen, and a few atoms of oxygen in its structure.

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The options for the function of cytokinesis should be:

(A) performing cell division in plant roots

(B) shoot system

(C) promoting the cell’s growth, development

(D) All of these

Answer - (D) All of these

One mole of  sucrose stores 5878 KJ of energy. Then 10000J or 10 kJ is stored by 0.0017 moles or 0.58 g of sucrose.

Sucrose is a disaccharide formed from one glucose and one fructose units. Sucrose is used as the table sugar. Sucrose can store the chemical energy as well as it can release it through decomposition.

One mole of sucrose stores an energy of 5878.8 KJ.

molar mass of sucrose = 342. 3 g/mol

then, no.of moles of sucrose which stores 10 KJ energy = 10 /5878.8 = 0.0017 moles.

Mass of 0.0017 moles = no.of moles × molar mass

mass = 0.0017 × 342.3 g/mol = 0.58 g.

Therefore, 0.58 g of sucrose stores 10 J of energy.

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The ph of a 0.5m solution of an acid with a pKa of 8.4 is 6.91 (approx.)  

To find the pH of a 0.5 M solution of an acid with a pKa of 8.4, we can use the Henderson-Hasselbalch equation:

pH = pKa + log([A⁻]/[HA])

Where [A⁻] is the concentration of the conjugate base and [HA] is the concentration of the acid. We can assume that the initial concentration of the acid is 0.5 M, and that it is fully dissociated in solution.

So, [A⁻] = 0.5 M and [HA] = 0 M.

Now, we can substitute these values into the equation:

pH = 8.4 + log(0.5/0)

Since the logarithm of 0 is undefined, we can simplify the equation to:

pH = 8.4 + log(0.5)

Using a calculator, we can solve for the pH:

pH = 6.91

Therefore, the pH of a 0.5 M solution of an acid with a pKa of 8.4 is approximately 6.91.

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Answer:

The volume of the solution is 3 L.

Explanation:

Molarity is a measure of the concentration of that substance that indicates the number of moles per unit volume. In other words, molarity is the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution.

\(Molarity=\frac{number of moles of solute}{solution}\)

Molarity is expressed in units \(\frac{moles}{liter}=M\)

In this case:

Replacing in the definition of molarity:

\(0.25 M=\frac{0.75 moles}{volume}\)

volume*0.25 M= 0.75 moles

\(volume=\frac{0.75 moles}{0.25 M}\)

volume= 3 L

The volume of the solution is 3 L.

The most likely cause of a high incidence of covalent bonds between thymine and other nucleotides in the DNA of skin cells of a patient is exposure to ultraviolet radiation.

Nucleotides are the basic molecules that are found in the DNA and RNA molecules.

The nucleotides are linked to each by means of phosphodiester bonds.

The nucleotides that are found in the nucleic acids are given below:

Mutations occur in these nucleotides when they are exposed to chemicals as well as ionizing radiation. Also, exposure to ultraviolet radiation affects the structure of the nucleotides.

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Answer:

the third one

Explanation:

When you breathe in, you inhale oxygen and exhale carbon dioxide

Answer:

a: palladium or Pd

b: arsenic or As

c: magnesium or Mg

d: radon or Rn

e: francium kr Fr

Explanation:

i looked at the periodic table haha

a. The element in group 10 and period 5 is palladium or Pd. b. The element in group 15 and period 4 is arsenic or As.  c. The element in group 2 and period 3 is magnesium or Mg. d. The element in group 18 and period 6 is  radon or Rn. e. The element in group 1 and period 7 is francium or Fr.

A chemical element is a species of atoms, including the pure substance made entirely of that species, that have a specific number of protons in their nuclei. Chemical elements, in contrast to chemical compounds, cannot be reduced by any chemical process into simpler molecules.

A substance is considered to be an element if it cannot be reduced to a less complex form. They can be identified by their particular atomic number. The periodic table groups the elements according to their atomic number and draws attention to those with related qualities.

Each element's atom contains a specific number of protons. For instance, a carbon atom has six protons compared to the one proton in a hydrogen atom. Ions are created by changing the number of electrons in an element's atom.

Thus,  The element in group 10 and period 5 is palladium or Pd.

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The fact that there are more possible combinations for amino acids than the number of amino acids themselves implies that each amino acid can be encoded by multiple codons.

A codon is a sequence of three nucleotides in DNA or RNA that corresponds to a specific amino acid.

There are 20 standard amino acids used to build proteins in living organisms. However, there are 64 possible three-letter combinations of nucleotides (4³) that can be used to form codons. This means that on average, there are more than three codons that can encode each amino acid.

To calculate the number of codons per amino acid on average, we divide the total number of codons (64) by the number of amino acids (20). Therefore, the average number of codons per amino acid is 64/20 = 3.2.

This indicates that there is a degeneracy or redundancy in the genetic code, where multiple codons can specify the same amino acid.

For example, the amino acid leucine is encoded by six different codons (UUA, UUG, CUU, CUC, CUA, CUG), while methionine and tryptophan are each encoded by a single codon.

In conclusion, the existence of more possible combinations for amino acids than amino acids themselves means that the genetic code is degenerate, allowing for redundancy and flexibility in protein synthesis.

This redundancy helps to protect against errors in DNA replication and transcription and allows for evolution to occur through the accumulation of genetic variations.

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Answer:

C20

Explanation:

Element is a pure substance which is composed of atoms of similar elements. It can not be decomposed into simpler constituents using chemical reactions. Example: Carbon

Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass. It can be decomposed into simpler constituents using chemical reactions.

Example: Carbon monoxide.

Thus chemical symbol represents an element is C20

Pretty sure this is what you're looking for.

the density of a piece of metal that has a mass :- = 0.53279659

What is density ?

The substance's mass per unit of volume is known as its density (volumetric mass density or specific mass). Although the Latin letter D may also be used, the sign most frequently used for density is (the lower case Greek letter rho). Density is calculated mathematically by dividing mass by volume.

where m is the mass, V is the volume, and is the density. Density is sometimes roughly characterized as weight per unit volume[2], while this is incorrect scientifically; this quantity is more precisely known as specific weight. An example of this is in the US oil and gas business.

The density of a pure substance is equal to its mass concentration in numbers. Density can be important to buoyancy since different materials typically have varied densities.

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Answer:

4.70 grams of NH4Cl is needed to prepare 350 mL of a 0.25 M ammonium chloride solution.

We need approximately 4.68 grams of NH4Cl to prepare a 0.25 M ammonium chloride solution with a volume of 350 mL.

To determine the mass of NH4Cl needed to prepare the solution, we us use the formula:

m=M x V x MM ... (i)

where,

m= mass in grams

M=molarity of solution

MM= molar mass of compound

V= volume in litres

The number of moles of NH4Cl needed can be calculated using:

  Moles = Molarity x Volume ...(ii)

  Moles = 0.25 mol/L x 0.350 L

  Moles = 0.0875 mol

Hence we can replace M x V with number of moles in equation i.

The molar mass of NH4Cl is :

  Molar mass of NH4Cl = (1 x 14.01 g/mol) + (4 x 1.01 g/mol) + (1 x 35.45 g/mol)

  Molar mass of NH4Cl = 53.49 g/mol

We have all the variables

Putting them in equation i.

Hence,

  Mass (g) = Moles x Molar mass

  Mass (g) = 0.0875 mol x 53.49 g/mol

  Mass (g) = 4.68 g

Therefore, you would need approximately 4.68 grams of NH4Cl to prepare a 0.25 M ammonium chloride solution with a volume of 350 mL.

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Answer:

0.96

Explanation:

Number of moles of Fe(III) = 3/1000 *  0.002 M = 6 * 10^-6 moles

Number of moles of SSA = 7/1000 * 0.02 = 1.4 * 10^-4 moles

Total number of moles =  6 * 10^-6 moles +  1.4 * 10^-4 moles

Mole fraction of SSA = number of moles of SSA/ total number of moles.

Mole fraction of SSA =  1.4 * 10^-4 moles/  6 * 10^-6 moles +  1.4 * 10^-4 moles

Mole fraction of SSA = 0.96

The answer is 67 108.0888km/s.

The chemical equation for the reaction of hydrogen gas (H2) and nitrogen gas (N2) to form ammonia gas (NH3) is as follows N2 + 3H2 → 2NH3 3 moles of hydrogen gas .

react with 1 mole of nitrogen gas to form 2 moles of ammonia gas, according to this equation. As a result, we can use a mole ratio to calculate the number of moles of ammonia created when 6 moles of hydrogen react with 3 moles of nitrogen 6 moles H2 x (2 moles NH3/ 3 moles H2) = 4 moles NH3. As a result, if 6 moles of H2 react with 3 moles of N2, 4 moles of NH3 are formed. The chemical equation for the reaction of hydrogen gas (H2) and nitrogen gas (N2) to form ammonia gas (NH3) is as follows N2 + 3H2 → 2NH3 3 moles of hydrogen gas .

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Answer:

compound

Explanation:

because it is made up of pure substance consists of atom

Answer:

Organ

Explanation:

I got it right when I took the test.

Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

\(volume = \frac{mass}{density} \\\)

From the question we have

\(density = \frac{100}{2.4} \\ = 41.66666...\)

We have the final answer as

Hope this helps you

The limiting reagent in this scenario is \(O_{2}\) because we have more \(H_{2}\) (20 moles) than is required (16 moles).

We must compare the mole ratios of the reactants to the stoichiometry of the balanced equation in order to identify the limiting reagent. The reaction's balanced equation is as follows:

2 H₂ + O₂ -> 2 H₂O

We can deduce from the equation that the \(O_{2}\) to \(H_{2}\) ratio is 1:2. Therefore, we require two moles of \(H_{2}\) for every one mole of \(O_{2}\).

We can determine the quantity of \(H_{2}\) required for the reaction if we have 8 moles of \(O_{2}\) and 20 moles of \(H_{2}\):

2 moles of \(H_{2}\) divided by 1 mole of \(O_{2}\) results in 16 moles of \(H_{2}\).

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Answer:

44.01

Explanation:

12.01 + 16.00 + 16.00 = 44.01

Answer:

Follows are the solution to the given question:

Explanation:

Following are the balanced redox equation:

\(Cr_2O_7^{2-} + 6 Fe^{2+} + 14H^{+} \to 2Cr^{3+} + 6 Fe^{3+} + 7H_2O\)

Calculating the average volume of the dichromate:

\((i)\ 13.8 - 2.3 = 11.5 \ ml\\\\(ii)\ 24.4 - 13.8 = 10.6\ ml\\\\(ii)\ 35.2 - 24.4 = 10.8 \ ml\\\\(iv)\ 45.9 - 35.2 = 10.7\ ml\)

\(Mean\ volume = 10.9\ ml = 0.0109\ L\\\\moles\ Fe^{2+} \ titrated = 0.01500 \ L \times 0.07\ \frac{mol}{L} = 0.00105 \\\\moles\ Cr_2O_7^{2-}\ required = 0.00105\ mol\ Fe^{2+} \times 1 \ mol\ \frac{Cr_2O_7^{2-}}{6 \mol\ Fe^{2+} } = 0.000175 \ moles\ Cr_2O_7^{2-}\\\\Concentration \ of\ Cr_2O_7^{2-} = \frac{0.000175\ moles}{0.0109\ L} = 0.01606\ M\\\\\)

Answer:

add a substace devider

Explanation:

i forgot what it was called but there is a chemical that allows the substances to seperste and than you can test the substaces ph and what it is

Answer:

\(MgO _{(s)} + 2H {}^{ + } _{(aq)} = Mg {}^{2 + } _{(aq)}+ H _{2} O _{(l)} \\ \)

Answer:

Hydrogen bonding

Explanation:

Water is a compound found readily in nature. It is made up of interatomic forces of covalent bonds that connects the hydrogen and oxygen bonds together in a definite ratio.

Answer:

C6H12O6+6O2--->6CO2+6H2O

Explanation:

So I went through all the answers and could not find the right one amongst. If I'm not wrong the reaction above is the reaction for respiration. The nearest answer is D but unfortunately the first reactant isn't in accordance with that which the question has given.

Answer:

Carbon monoxide (CO) is not a greenhouse gas because it does not trap heat in the Earth's atmosphere.

Explanation:

Answer:

Carbon monoxide (CO) is not a greenhouse gas.

Carbon monoxide is a colorless, odorless, poisonous gas, CO, that burns with a pale-blue flame, produced when carbon burns with insufficient air: used chiefly in organic synthesis, metallurgy, and in preparation of metal carbonyls, as nickel carbonyl.

Water vapor is a dispersion, in air, of molecules of water, especially as produced by evaporation at ambient temperatures rather than by boiling.

The chemical compound with the formula CH4 is methane, a hydrocarbon and primary component of natural gas. It is used in the manufacture of plastics and other commercially important organic chemicals. Methane is also a greenhouse gas that affects the earth's temperature and climate system.

Any of the gases whose absorption of solar radiation is responsible for the greenhouse effect, including carbon dioxide, methane, ozone, and the fluorocarbons.

The Greenhouse Effect is an atmospheric heating phenomenon, caused by short-wave solar radiation being readily transmitted inward through the earth's atmosphere but longer-wavelength heat radiation less readily transmitted outward, owing to its absorption by atmospheric carbon dioxide, water vapor, methane, and other gases; thus, the rising level of carbon dioxide is viewed with concern.

The mole fraction of acetone in this solution is 0.31 to 2 significant digits. The mole fraction of a solute in a solution can be calculated as the number of moles of the solute divided by the total number of moles of both solute and solvent in the solution.

First, we need to calculate the number of moles of acetone and methanol:

moles of acetone = 90 g / (58.08 g/mol) = 1.54 mol

moles of methanol = 108 g / (32.04 g/mol) = 3.36 mol

Next, we add up the moles of both solute and solvent:

total moles = 1.54 mol + 3.36 mol = 4.90 mol

Finally, we can calculate the mole fraction of acetone as follows:

mole fraction of acetone = (1.54 mol of acetone) / (4.90 mol) = 0.31

So the mole fraction of acetone in this solution is 0.31 to 2 significant digits.

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Complete question:

A solution is made by mixing 90. g of acetone ((CH₃)₂CO) and 108. g of methanol (CH₃OH). Calculate the mole fraction of acetone in this solution. Round your answer to 2 significant digits. X?

Glycinate donates an electron pair so it is a bidentate ligand.

The molecular formula is C₂H₄NO₂⁻. The octahedral complex is formed between glycinate molecules and cobalt(III) and the stoichiometry of the complex is [Co(gly)₃]. The reaction is as follows;

Co₃⁺(aq) + 3C₂H₄NO₂⁻ ⇒ [Co(C₂H₄NO₂⁻](aq)

A cobalt complex is formed when 3 glycinate ions equivalents react with one Co₃⁺ ion equivalent so, it is necessary to keep the glycinate ions concentration greater than the cobalt(III) ions at least three times more.

So, taking the concentration 4 times greater can facilitate the reaction.

For a complex whose concentration is 0.015M, 0.06M glycinate ions are required to obtain the desired cobalt(III) glycinate complex.

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Answer:

Vocational training refers to instructional programs or courses that focus on the skills required for a particular job function or trade. Vocational training education prepares students for specific careers, disregarding traditional, unrelated academic subjects.