What is the pressure in a 28.0-LL cylinder filled with 32.2 gg of oxygen gas at a temperature of 334 KK ?
Express your answer to three significant figures with the appropriate units.

Answer: 223.2283 inches

Scientist discovered a species that doesn’t have any organelles. organism could it be Bacteria.

Organelles are the tiny organs of the cell. organelles have one or more than one jobs to perform. The most important cell organelles is nuclei. Bacteria is single cell organism having cellular DNA  and no organelles.  Bacteria belongs to prokaryotic cells. Prokaryotic cells are smaller than the eukaryotic cells. Prokaryotic cell do not have nucleus and do not have organelles. You can find bacteria in almost everywhere in earth. some bacteria can survive in extreme temperature and pressure.

Thus, Scientist discovered a species that doesn’t have any organelles. organism could it be Bacteria.

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0.253 M is the molarity of a solution of sodium hydroxide if 31. 4 mL is neutralized by 17. 8 mL of a 0. 149 M phosphoric acid

To determine the molarity of a solution of sodium hydroxide (NaOH) using the given information, we can write a balanced equation for the neutralization reaction between NaOH and phosphoric acid (H₃PO₄) and use stoichiometry to find the molarity. The volume of the phosphoric acid and its molarity are provided as 17.8 mL and 0.149 M, respectively. By finding the ratio of moles between NaOH and H₃PO₄, we can calculate the molarity of the NaOH solution.

The balanced equation for the neutralization reaction between NaOH and H₃PO₄ is:

3 NaOH + H₃PO₄ → Na₃PO₄ + 3 H2O

From the equation, we can see that the ratio between NaOH and H₃PO₄ is 3:1. Given that 17.8 mL of 0.149 M H₃PO₄ is neutralized, we can use stoichiometry to find the moles of NaOH.

The moles of H3PO4 can be calculated by multiplying the volume (in liters) by the molarity: 17.8 mL * 0.149 mol/L = 2.6512 * 10⁻³ mol.

Since the ratio between NaOH and H₃PO₄ is 3:1, the moles of NaOH would be three times that of H₃PO₄: 3 * 2.6512 * 10⁻³ mol = 7.9536 * 10^-3 mol.

Finally, we calculate the molarity of the NaOH solution by dividing the moles of NaOH by the volume of the NaOH solution in liters (31.4 mL = 31.4 * 10⁻³ L): (7.9536 * 10⁻³ mol) / (31.4 * 10⁻³ L) = 0.253 M.

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0.00853 moles of hydrogen gas are produced and the volume of H2 measured at STP is 191 mL.

In the given reaction, 0.230 g of Al reacts with an excess of NaOH to produce hydrogen gas and NaAlO2. To determine the number of moles of hydrogen gas produced, we can use the following steps:

Calculate the number of moles of Al using its molar mass:
0.230 g Al × (1 mol Al / 26.98 g Al) = 0.00853 mol Al

Use the balanced chemical equation to determine the mole ratio between Al and H2:
Al(s) + NaOH(s) + H2O(l) → H2(g) + NaAlO2(aq)
According to the equation, 1 mol of Al produces 1 mol of H2.

Use the mole ratio to determine the number of moles of H2 produced:
0.00853 mol Al × (1 mol H2 / 1 mol Al) = 0.00853 mol H2

Use the ideal gas law to determine the volume of H2 at STP (standard temperature and pressure):
PV = nRT
V = (nRT) / P
V = (0.00853 mol H2 × 0.08206 L·atm/mol·K × 273.15 K) / 1 atm
V = 0.191 L H2

Convert the volume from liters to milliliters:
0.191 L H2 × (1000 mL / 1 L)

=> 191 mL H2

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Answer:

The mole and atonmicity of both the gases are different, the number of atoms is not same.

Explanation:

The number of atoms in a molecule (compound) depends on mole number and atomicity.

↬ Mole of 100 g H₂ = 100g ÷ 2u = 50 mole

∴Number of atoms in 100 g H₂

= 2 x 50 x 6.022 × 10²³

= 6.022 x 10²⁴ atoms

↬ Mole of 100 g He = 100g ÷ 4u = 25 mole

∴ Number of atoms in 100 g He

= 1 × 25 × 6.022 × 10²³

= 150.55 × 10²³

= 1.5055 x 10²⁵ atoms

Thus, The mole and atonmicity of both the gases are different, the number of atoms is not same.

-TheUnknownScientist 72

If silver ions were slowly added to a mixture of aqueous halide ions, the Silver iodide compound would precipitate first.

Silver ions (Ag+) have a higher reduction potential than halide ions in the outermost valence. That means they can attract or lose halide ions from their compounds to become silver halide salts. The solubility level of silver halide salts depends upon the ion concentration of halide.

silver chloride (AgCl) is the less soluble reactant in the silver halides and they will become a mixture of halide ions. Silver bromide (AgBr) and silver iodide (AgI) are more soluble than aqueous halide ions.

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The Montreal Protocol categorizes CFCs and halons in two classes based on their ozone-depletion potential.

The Montreal Protocol categorizes CFCs and halons in two classes based on their ozone-depletion potential. These chemicals are also considered greenhouse gases, which contribute to global warming and climate change. Montreal Protocol is an international treaty designed to protect the ozone layer by phasing out the production and consumption of ozone-depleting substances.
The Ozone Depletion Potential (ODP) of a compound is the relative rate at which it can degrade the ozone layer, and the ODP for trichlorofluoromethane (R-11 or CFC-11) is fixed at 1.0.

ODP can be estimated from the molecular structure of a particular product. The ODP of chlorofluorocarbons is about 1. The brominated types generally have higher ODP in the range of 5-15 because bromine reacts more aggressively with ozone. Most HCFCs have an ODP in the range of 0.005 - 0.2 Due to the presence of hydrogen, they easily react in the troposphere, thus reducing their chances of reaching the stratosphere where the ozone layer is located. Hydrofluorocarbons (HFCs) do not contain chlorine, so their ODP is essentially zero. ODP is often used in conjunction with a compound's Global Warming Potential (GWP) to assess whether a compound is environmentally friendly.

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Answer and Explanation:

Your mass is the same no matter where you go in the universe; your weight, on the other hand, changes from place to place. Mass is measured in kilograms; even though we usually talk about weight in kilograms, strictly speaking, it should be measured in newtons, the units of force. (according to cosmicmagazine.com)(not my writing or explanation)

In an open container, an equilibrium vapor pressure can be reached as long as the liquid has molecules capable of evaporating and the surrounding space allows for the escape and mixing of vapor molecules with the air.

Vapor pressure is the pressure exerted by the vapor molecules when the liquid and vapor are in equilibrium. It is a measure of the tendency of a liquid to evaporate. At any given temperature, molecules within the liquid have a range of kinetic energies. Some molecules have sufficient energy to overcome intermolecular forces and escape into the gas phase, forming vapor. As more molecules escape, the vapor density increases, creating a pressure known as the vapor pressure.

In an open container, the vapor molecules can freely escape into the surrounding space and mix with the air. Initially, the evaporation rate is high as molecules escape from the liquid surface. As the concentration of vapor molecules increases, collisions between the vapor and liquid surface also result in some molecules returning to the liquid phase, which is called condensation. Eventually, a dynamic equilibrium is established where the rate of evaporation and condensation become equal.

At this equilibrium, the vapor pressure above the liquid remains constant as long as the temperature is constant. The concentration of vapor molecules in the air above the liquid reaches a steady state, and the system is said to be saturated. The equilibrium vapor pressure is determined by the temperature and the characteristics of the liquid, such as its volatility and intermolecular forces.

Therefore, In an open container, an equilibrium vapor pressure can be reached above a liquid.

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Answer:

Fluid friction describes the friction between layers of a viscous fluid that are moving relative to each other

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Thank you

Answer: Here u go!

Explanation:

a) Atomic radius (excluding noble gases)  (Decrease)

b) First ionization energy  (Increase )

c) Electronegativity  ( Increase)

Hope this helps!(it took me a while sry)

The atomic radius will decrease, first ionization energy will increase, and electronegativity will increase from left to right across the periodic table.

Explanation:

So, from this, we can conclude that atomic radius will decrease, first ionization energy will increase, and electronegativity will increase from left to right across the periodic table.

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Answer:

Flavors and fragrances

Answer:

I would say D (not sure tho)

Explanation:

Answer:

There are four types of chemical reactions: synthesis or combination reactions, decomposition reactions, single displacement or replacement reactions, and double displacement or metathesis reactions. Synthesis reactions combine two or more reactants to form a single product, decomposition reactions break down a single reactant into two or more products, single displacement reactions involve an element reacting with a compound to produce a new element and compound, and double displacement reactions involve two compounds exchanging ions to form two new compounds.

There must have been 0.10mol of \(C_{2} H_{2} O\) in the container at the beginning.

 \(C_{2} H_{2} O\) + \(2O_{2}\) = \(2CO_{2}\) + \(H_{2} O\)

The above reaction makes it quite evident that 1 mol of \(C_{2} H_{2} O\) combines to create 2 mol of \(CO_{2}\) and \(O_{2}\) is given in excess that \(C_{2} H_{2} O\) alone controls a product's formation. Therefore, here, O is an excess reactant and \(C_{2} H_{2} O\) is a limiting reactant.

It takes 6 times as much \(C_{2} H_{2} O\) to produce 1 mol of \(CO_{2}\) from 0.05 mol of \(C_{2} H_{2} O\).

Now, 0.6 divided by 6 mol of reactant is required for 0.60 moles of \(CO_{2}\)to produce, which translates to

moles of \(C_{2} H_{2} O\) = 0.6/6 = 0.1 mol .

Therefore, \(C_{2} H_{2} O\) must have been present in the container in an initial concentration of 0.10mol.

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To shed light on the process by which titanium dioxide (TiO2) nanoparticles are formed, titanium tetrachloride (TiCl4) hydrolysis has been investigated.

Hydrogen chloride (HCl) gas, which is extremely caustic and hazardous, is known to be released violently when TiCl4 reacts with water. The estimate of the scope and gravity of the effects of large accidents that have been identified, such as an unintentional spill of TiCl4, is, however, not shared by the industry.

An alternative strategy (which is the opposite of the solution above) would be to assert that since metal chlorides are often ionic, titanium chloride must be a tiny (covalent) molecule with weak molecular interactions if it is a liquid at room temperature.

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Answer:

B

Explanation:

i think with exothermic reactions heat is released

this is what i looked up

hope this helps i took chem last year and think this is what i learned

Considering the definition of exothermic and endothermic reactions, the correct answer is second option: the reaction is endothermic.

Energy is the ability to do work or to produce heat.

Remembering that chemical reactions involve a reorganization of atoms between substances with breaking or formation of chemical bonds, this formation or breaking of chemical bonds is accompanied by changes in the energy of the system.

Chemical reactions that release heat are called exothermic. That is, an exothermic reaction is one where energy flows out of the system.

So, at room temperature, the heat released by a chemical reaction is enough to cause a rise in temperature.

An endothermic reaction is one that requires heat to take place. In other words, a chemical reaction is endothermic when it absorbs energy from the environment.

In this case, the heat is transferred from the outside to the inside of the system. By absorbing heat, the effect of an endothermic reaction is to lower the temperature.

When ammonium chloride is dissolved in water, the beaker gets cold. That means the system is absorbing heat from the surrounding and the temperature does down.

So, the correct answer is second option: the reaction is endothermic.

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Answer:

a) Secretion of unpleasant liquids which make them distasteful.

Possession of spines or thorns or irritating hairs which cause pain or irritation on contact.

Possession of poisonous parts which cause pain or itching or death or swelling on contact.

b) An anion is a negatively charged atom (or group of atoms).

OR

An anion is an ion formed when an atom (or group of atoms) gain electrons.

c) i. NH4OH and dilute HCL.

= Ammonium chloride, water

ii. CACO3 and dilute HCL.

= Calcium chloride, water, carbon dioxide or carbon (IV) oxide.

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Explanation:

Same as cherishdisah's answer. Thanks.

The ph of the solution will be acidic. It is because of the higher ka value of ammonia as compared to kb of nitrate

As we know, A salt solution contains ammonium cation (ka = 5.7 × 10^–10) and nitrite anion (kb = 1.4 × 10^–11) in equal proportions but the ka and kb are different.

As we see that the value of ka is higher than the kb that's why the ph level will be acidic.

Acidic solutions are sour in taste as compared to alkaline solutions.

We know that the ph scale basically ranges from 0 to 14. The ph solutions less than 7 are acidic and greater than 7 are basic.

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The pressure exerted by the neon gas, when the volume is increased from 7.2 mL to 28.8 mL at constant temperature, can be calculated using Boyle's Law. The pressure exerted by the neon gas, when the volume is increased to 28.8 mL at constant temperature, is 0.375 atm.

Boyle's Law states that at constant temperature, the product of the pressure and volume of a gas remains constant. Mathematically, it can be expressed as P₁V₁ = P₂V₂. This law allows us to calculate the change in pressure when the volume changes.

In this case, the initial volume (V₁) is given as 7.2 mL, and the initial pressure (P₁) is 1.5 atm. The final volume (V₂) is 28.8 mL. By substituting these values into Boyle's Law equation, we can solve for the final pressure (P₂).

When we perform the calculations, we find that the pressure exerted by the neon gas, when the volume is increased to 28.8 mL, is 0.375 atm. As the volume increases, the pressure decreases due to the inverse relationship between pressure and volume.

Using Boyle's Law: P₁V₁ = P₂V₂

Given:

Initial volume (V₁) = 7.2 mL

Initial pressure (P₁) = 1.5 atm

Final volume (V₂) = 28.8 mL

To find the final pressure (P₂):

P₂ = (P₁ * V₁) / V₂

  = (1.5 atm * 7.2 mL) / 28.8 mL

  = 0.375 atm

Therefore, the pressure exerted by the neon gas, when the volume is increased to 28.8 mL at constant temperature, is 0.375 atm.

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a) Transfer function:The pH neutralization process can be represented as a second-order system. The system transfer function can be obtained from the process reaction as shown below, 1/(τ1s+1)(τ2s+1).

Hence, the transfer function is given as: G(s) = 4/(2s+1)(3s+1)The desired closed-loop transfer function:Let’s assume that C(s) is the controller’s transfer function that takes the error and produces the control signal. And, G(s) is the process transfer function. The closed-loop transfer function is given by:T(s) = C(s)G(s)/[1+C(s)G(s)]The desired transfer function must be in a first-order system.

Now, substituting these values in T(s), we get the following equation: 1/(Tas+1) = Kp(1+Tis)4(Tas+1)(2s+1)(3s+1)Hence, we get the following values:Kp = 3.014Ti = 4.96sNominal feedback control may not achieve the design requirementThe nominal feedback control may not achieve the design requirement because the closed-loop transfer function cannot be made first-order with a time constant of 2 min.

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To answer your question, the useful buffering range of phosphoric acid and its conjugate base is approximately between pH 6.21 to 8.21.

This is because the pKa of phosphoric acid is 7.21, which means that at pH values below 6.21, most of the acid will be in its protonated form (H3PO4) and at pH values above 8.21, most of it will be in its deprotonated form (H2PO4-). However, within this buffering range, there will be a relatively equal distribution of both the protonated and deprotonated forms,

which allows for the acid-base pair to act as an effective buffer. The buffer capacity is the highest at pH = pKa and decreases as the pH moves away from pKa. The conjugate base of phosphoric acid is H2PO4-, and it acts as the base in the buffer system. In summary, the useful buffering range of phosphoric acid and its conjugate base is between pH 6.21 to 8.21, which allows for the acid-base pair to act as an effective buffer.

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There are 2.1 atoms of mercury.

Calculation:

Convert 0.0000355 mol of Hg to the '# of atoms of Hg' using Avagadro's number.

Avagadro's constant = 6.022 * 1023 atoms/ mole.

Hence 'number of atoms of Hg' in the given drop of mercury is

= 0.0000355 mol of Hg * 6.022 10²³ atoms of Hg 1 mole Hg

= 2.14* 1019 atoms of Hg.

In question, we are given 1.0 mm in 2 significant figures, so our final answer must also be in 2 significant figures.

Hence the number of atoms of Hg in a given drop of mercury is 2.1x10¹⁹ atoms Plugin 2.1.

Mercury is the smallest planet in the solar system and the closest to the sun. Its orbit around the Sun lasts 87.97 Earth days, making it the shortest of any planet in the solar system.

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The volume would be explanation times explanation because the explanation is the explanation

Explanation:

Answer:

\(\boxed {\boxed {\sf v=12 \ mL}}\)

Explanation:

Grace found the volume of the rock using water displacement.

To calculate the volume, we must subtract the initial volume from the final volume.

\(v_f-v_i\)

The initial or original volume is 20 milliliters.

The final or new volume, after the rock is added to the water, is 32 milliliters.

\(v_f=32 \ mL\\v_i=20\ mL\)

Substitute the values into the formula and subtract.

\(32 \ mL-20 \ mL\)

\(12 \ mL\)

The volume of the rock is 12 milliliters.

Answer:

The set of elements that are not arranged in the order of increasing ionization energy is Mo < Pd < Sn

Explanation:

The force of attraction on the outermost electron of an element can be described by the ionization energy of the element which decreases down a group and increases across a period

1) The given elements Ba, Sr, Ca, are group 2 elements arranged in the order from bottom up, which gives an increasing ionization energy, therefore;

Ba < Sr < Ca is arranged in increasing ionization energy, and therefore, increasing force of attraction of the outermost electron in atoms of the elements

Similarly, Al < P < Cl and Mo < Pd < Sn, are arranged in order of increasing ionization energy

However F < Cl < Br which are arranged from top down of elements in period 17 are arranged in the order of decreasing ionization energy, and therefore, decreasing force of attraction of the outermost electron in atoms of the elements.

The elements that are not arranged in their increasing force of attraction base on the outermost electron present in their atoms is D:

Mo < Pd < Sn.

Therefore , option D is correct.

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