why do we need nucleic acid in our cells?​

Answer:

3 steps are

evaporation

condensation

precipitation

Answer:

study island

proof

Explanation:

Fossilized marine creatures found at the top of the Himalayan Mountains provide evidence for a scientific theory of plate tectonics. Therefore, option (D) is correct.

Plate tectonics can be explained as the Earth's lithosphere being made of a large number of tectonic plates that have been slowly moving since about 3.4 billion years ago.

The lithosphere is broken into 7 or 8 major plates and many minor plates or "platelets". These plates meet, and their relative motion evaluates the kind of plate boundary: convergent, transform, or divergent.

Mountain-building, Earthquakes, volcanic activity, and oceanic trench formation take place along these plate boundaries. The relative annual movement of the plates ranges from 0 to 10 cm.

Tectonic plates are comprised of the oceanic and the thicker continental lithosphere. The process of subduction which is actually one plate moving under another carries the edge of the lower plate down into the mantle along convergent boundaries.

Pebbles, Shells, and marine fossils found in the limestone beds of the tallest Himalayas Mountains give evidence of the theory of plate tectonics.

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Answer:

Here's your Answer

Explanation:

the mass spectrum is the graphical representation of the ion abundance versus the mass to charge of the ions separated in mass spectrometer

This is probably wrong but i think the answer is 1,979,381.44

Answer:

To find the mass of the solute in the solution, we first need to convert the percent to a decimal by dividing by 100. Since the percent is 4%, we can divide by 100 to get 0.04.

Next, we can multiply the decimal value by the total mass of the solute to find the mass of the solute in the solution. In this case, the total mass of the solute is 200g, so we can multiply 0.04 by 200g to get:

0.04 * 200g = 8g

Therefore, the mass of the solute in the solution is 8g.

Answer:

The correct answer is - a.  Fluorine is the leaving group in Sarin.

Explanation:

A leaving group is a group that leaves a complete negative charge in heterolytic cleavage when it separates out from the molecule. Sarine reacts with the active site of the enzyme acetylcholinesterase that is essential for nerve transmission.

 In this given case, Sarin that is an acid fluoride and ester of methyl phosphonic acid, the fluorine atom is present is the one that leaves with a complete negative charge, therefore, fluorine is the leaving group in Sarin.

Thus, the first option is correct that Fluorine is the leaving group in Sarin.

Answer:

chemical change because a different solid substance is formed.

Answer:

B) Chemical Change

Explanation:

Combining the two clear colorless liquids is a chemical change because a different solid substance is formed. A precipitate is an insoluble solid that forms when two solutions are combined and react chemically. Insoluble means that the solid will not dissolve.

Answer:

IM NOT TO SURE ABOUT THIS DO YOU HAVE THE DIAGRAM

Explanation:

The mass of 5.15 × 10²¹ atoms of chromium is 0.44 g

From Avogadro's hypothesis,

6.02×10²³ atoms = 1 mole of Cr

But:

1 mole of Cr = 52 g

Thus, we can say that:

6.02×10²³ atoms = 52 g of Cr

With the above information, we can obtain the mass of 5.15 × 10²¹ atoms of chromium. This can be obtained as follow:

6.02×10²³ atoms = 52 g of Cr

Therefore,

5.15×10²¹ atoms = (5.15×10²¹ × 52) / 6.02×10²³

5.15×10²¹ atoms = 0.44 g of Cr

Thus, the mass of 5.15 × 10²¹ atoms of chromium is 0.44 g

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Answer:  The student's conclusion is inaccurate, smoke is a chemical change, but steam is a physical change.

Explanation:

When boiling water changes into steam, the matter composition of water is still the same (it remains H₂O). In this case, only the physical state of the water is changed from a liquid to a vapor (gas). When collected, the water vapor (gas) returns to its original liquid form proving that NO chemical reaction has taken place.

In contrast, a fire is a combustion chemical reaction that converts a fuel material (such as wood, fuel, or paper) and oxygen into carbon dioxide (CO₂) and water (H₂O). As an exothermic chemical reaction, the fire gives off heat in addition to the gaseous smoke. Unlike boiling, the fire permanently alters the fuel material as a result of the chemical reaction process.

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Answer:

39.119 g

Explanation:

1 mole of S has 32.065 g

=> 1.22 x 32.065 = 39.1193 or 39.119 g

Answer:

Ans: 8.9 NaCl

Explanation:

Ocean water contains 3.5 nacl by mass how much salt can be obtained from 254 g of seawater

Question: Ocean water contains 3.5% NaCl by mass. How much salt can be obtained from 254g of seawater?

Determine the amount of KOH present in the resulting solution. KOH was initially 0.00875 mol, then 0.00525 mol of it interacted with HCl. As a result, 0.00875 mole - 0.00525 mol (= 0.00350 mol of KOH is left. The resulting solution has a volume of 70.0 mL (35.0 mL plus 35.0 mL).

The titrant (NaOH), which is added gradually throughout the course of a titration, is added to the unknown substance. The equivalency point is the moment at which precisely the right quantity of titrant (NaOH) has indeed been added that react to the entire analyte (HCl).

What took place during titration: One mole of NaOH interacts with one mole of HCl inside the reaction between the two substances. NaOH with HCl equals NaCl plus H2O. (NaOH and HCl have a mole ratio of 1:1.) • The NaOH concentration is 0.1 M, or 0.1 molecules per litre.

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Answer:

The reaction N2 + 3H2 → 2NH3 is an exothermic reaction, which means that it releases heat. The amount of energy released is called the enthalpy of reaction, and it is typically measured in kilojoules per mole (kJ/mol). The enthalpy of reaction for the Haber-Bosch process, which is the industrial process used to produce ammonia, is -46.2 kJ/mol. This means that for every mole of ammonia produced, 46.2 kJ of heat is released.

The energy released during the Haber-Bosch process is used to heat the reactants and to drive the reaction forward. The reaction is exothermic because the bonds in the products (NH3) are stronger than the bonds in the reactants (N2 and H2). When the reactants are combined, the energy released when the bonds in the products form is greater than the energy required to break the bonds in the reactants. This excess energy is released as heat.

The Haber-Bosch process is a very important industrial process, and it is used to produce ammonia on a large scale. Ammonia is used in a variety of products, including fertilizers, explosives, and plastics. The exothermic nature of the Haber-Bosch process makes it a very efficient way to produce ammonia.

Explanation:

Therefore, the volume of 1.20 M FeCl₂ required to obtain 0.850 moles of Cl⁻ ions is 0.354 L.

What is Moles?

One mole of a substance is defined as the amount of that substance that contains the same number of entities, such as atoms, molecules, or ions, as there are in 12 grams of carbon-12. This number, known as Avogadro's number, is approximately 6.022 x 10²³.

The molecular formula for FeCl₂ shows that it contains 2 chloride ions (Cl⁻) for each FeCl₂ molecule. Therefore, the number of moles of Cl⁻ ions is twice the number of moles of FeCl₂.

Given that we want to obtain 0.850 moles of Cl⁻ ions, we can calculate the number of moles of FeCl₂ required as follows:

moles of FeCl₂ = 0.850 moles Cl⁻ ions / 2 = 0.425 moles FeCl₂

To calculate the volume of 1.20 M FeCl₂ required to obtain 0.425 moles, we can use the formula:

moles = concentration (in M) x volume (in L)

Rearranging this formula to solve for volume, we get:

volume (in L) = moles / concentration (in M)

Substituting the values we have, we get:

volume (in L) = 0.425 moles / 1.20 M = 0.354 L

Therefore, the volume of 1.20 M FeCl₂ required to obtain 0.850 moles of Cl⁻ ions is 0.354 L.

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Answer:

Explanation:

physical substance in general, as distinct from mind and spirit; (in physics) that which occupies space and possesses rest mass, especially as distinct from energy.

Answer:

Anything that takes up space.

Explanation:

Anything that has both volume and mass.

Benzoic acid and sodium nitrate can be separated through extraction technique.

Extraction involves the transfer of compound from either solid or liquid into a different solvent. This technique uses inorganic chemistry to isolate or remove a target compound.

The separation of sodium nitrate and benzoic acid is based on their polarity differences and any other components of the mixture.

Therefore, extraction technique can be used to separate a mixture of benzoic acid and sodium nitrate.

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The balanced molecular equation for the reaction between sodium hydroxide (NaOH) and aluminum chloride (\(AlCl_3\)) in aqueous solution can be written as follows: 2NaOH(aq) + 3\(AlCl_3\)(aq) → 3NaCl(aq) + \(Al(OH)_3\)(s)

In this reaction, sodium hydroxide (NaOH) reacts with aluminum chloride (\(AlCl_3\)) to form sodium chloride (NaCl) and aluminum hydroxide (\(Al(OH)_3\)). The coefficients in the balanced equation indicate the stoichiometric ratio between the reactants and products.

The physical states of the substances are indicated by the symbols (aq) for aqueous solutions and (s) for the solid precipitate.

The reaction is a double-displacement reaction, also known as a precipitation reaction. Double-displacement reactions involve the exchange of ions between two compounds, resulting in the formation of a precipitate.

In this case, sodium hydroxide and aluminum chloride react to form sodium chloride and aluminum hydroxide, with aluminum hydroxide being the white solid precipitate.

It's worth noting that the actual reaction might involve hydrated forms of the compounds, such as NaOH·x\(H_2O\) and \(AlCl_3\)·y\(H_2O\). However, for simplicity, these hydrated forms are not included in the balanced equation.

Overall, the balanced equation represents the chemical reaction between sodium hydroxide and aluminum chloride, showing the reactants, products, and their stoichiometric ratios.

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Answer:

\(0.0427~%\)

Explanation:

In this question, we have to start with the calculation of the amount of drug in each powder:

Powder A: Total mass of 0.5 Kg percentage of 0.038%

\(0.5~Kg~of~powder\frac{0.038}{100}=0.00019~Kg~of~drug\)

Powder B: Total mass of 10 Kg percentage of 0.043%

\(10~Kg~of~powder\frac{0.043}{100}=0.0043~Kg~of~drug\)

The total mass of powder would be:

\(10+0.5=10.5~Kg\)

The total mass of drug would be:

\(0.0043+0.00019=0.00449~Kg\)

Now we can calculate the percentage:

\(\frac{0.0043Kg}{10.5Kg}*100=0.0427%\)

I hope it helps!

Answer:

Close packing in crystals refers to space efficient arrangement of constituent particles in a crystal lattice. To understand this packing more clearly we have to assume all particles (atoms, molecules and ions) are of the same spherical solid shape. So the unit cell of a lattice is a cubic shape.

Explanation:

Hope it helps! Correct me if I am wrong :>

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Explanation:

option B is the correct answer, 1.67g/mL.

hope this helps you.

The number of moles of NO₂ formed when 10.2 moles of NO₃ reacts is 20.4moles.

According to this question, nitrogen IV oxide (NO₂) reacts with nitrogen II oxide (NO) to form nitrogen VI oxide (NO₃) as follows:

NO₃ + NO → 2NO₂

The number of moles of either the reactants or the products can be calculated stoichiometrically as follows:

Based on the above chemical equation, 1 moles of NO₃ reacts to form 2 moles of NO₂.

This means that if 10.2 moles of NO₃ reacts, 10.2 × 2 = 20.4 moles of NO2 will be produced.

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Answer:

proteins in hair

Explanation:

proteins are polymers of amino acids. so if proteins are polymers of amino acids it means that proteins in hair are made of polymers

Answer:

The corrects answers would be DNA, the proteins in hair, and rubber car tires. A, D, and E.

Explanation:

DNA is made of nucleotides. The proteins that make up hair are made of amino acids. Rubber car tires are made from the polymerization of a variety of monomers, which includes isoprene. All of these are example of polymers.

The total energy of the system remains constant, and energy is conserved. Option A.

According to the law of conservation of energy, energy cannot be created or destroyed, it can only be transformed from one form to another.

In this case, the excess 22 kJ of energy is stored in the chemical bonds of the products when they are formed. The energy comes from the chemical bonds of the reactants, which break during the reaction and release energy.

Therefore, the total energy of the system remains constant, and energy is conserved.

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The temperature required to obtain a final pressure of 675 mm Hg194 is .86 K.

An ideal gas is a theoretical gas composed of many randomly transferring factor particles that aren't difficult to interparticle interactions. the best gasoline idea is beneficial because it obeys the precise gas law, a simplified equation of country, and is amenable to evaluation under statistical mechanics.

Volume is a degree of occupied three-dimensional space. it's far more frequently quantified numerically the usage of SI-derived gadgets or by way of diverse imperial gadgets. The definition of length is interrelated with the extent.

An ideal gas is described as one for which both the extent of molecules and forces between the molecules are so small that they have got no effect at the behavior of the gas.

Using the ideal gas equation:-

Given;

P₁ =  549mm Hg =   0.722369 atm

V₁ = 8.5 L

T₁ = 268 K

P₂ =  675 mm Hg = 0.89 atm

V₂ = 5

T₂ = ?

P₁V₁/T₁ =P₂V₂/T₂

T₂ = P₂V₂T₁/P₁V₁

     = 0.89 × 5 ×  268 / 8.5  × 0.72

     = 194 .86 K

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Answer: 4.88 g/mol. and helium

Explanation:

To find the molar mass of the gas, we can use the ideal gas law equation which is PV=nRT where:

P = pressure = 2.000 atm

V = volume = 50.00 L

n = number of moles

R = gas constant = 0.08206 L·atm/K·mol

T = temperature = 273.15 K

First, we need to find the number of moles of the gas:

PV = nRT

n = PV/RT

n = (2.000 atm)(50.00 L)/(0.08206 L·atm/K·mol)(273.15 K)

n = 1.844 mol

Now, we can find the molar mass of the gas by dividing its mass by the number of moles:

molar mass = mass/number of moles

mass = 9.00 g

molar mass = 9.00 g/1.844 mol

molar mass = 4.88 g/mol

Therefore, the molar mass of the gas is 4.88 g/mol.

To determine what gas this is, we can compare the molar mass of the gas to the molar masses of known gases. The molar mass of 4.88 g/mol is closest to that of helium (4.00 g/mol). Therefore, this gas is most likely helium.