A sample of gas initially at 1. 4 atm and occupies 720 ml whats the final pressure in atm when the volume changes to 820 mL?

Answer:

Ankara is the capital of Turkey! Hope this helped you out! :)

Explanation:

The capital of Turkey is Ankara

hopefully this helped :3

The required volume of the solution to be diluted is 4.42 ml so that 48.5 ml of the diluted solution contains 4.86 g CuCl2.

To determine the required volume of the solution to be diluted so that 48.5 ml of the diluted solution contains 4.86 g CuCl2, the volume of the solution can be calculated as follows: First, calculate the number of moles of CuCl2 in the 48.5 ml of the diluted solution. Using the equation: moles = mass / molar mass we get: moles of CuCl2 = 4.86 g / 134.45 g/mol = 0.036 moles CuCl2.

Now, the number of moles of CuCl2 in the original solution can be calculated using the formula: moles = molarity x volume

Therefore,0.036 moles = 8.15 M x VV = 0.00442 L = 4.42 ml

Hence, the required volume of the solution to be diluted is 4.42 ml.

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The water containing 2% starch solution will not change color immediately when lugol's iodine is added. A dialysis bag is a membrane that is semipermeable and holds the fluids that the kidneys normally remove. They are also used in the experiments.

A solution made of potassium iodide and iodine is known as lugol's iodine. The properties can be used as a reagent and an antiseptic and could be used to diagnose cancer. The iodine in Lugol's solution binds to glycogen's alpha-1,4 glucans, which are polysaccharides. This solution takes time to develop blue color when added to the 2% starch solution.

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Option E is Answer. The pH value of the buffer is 9.08

The pH of a solution: It is a measure of hydrogen ion concentration, which in turn is a measure of its own acidity. Pure water dissociates slightly into equal concentrations of hydrogen and hydroxyl (OH−) ions.

The pH is then calculated using the expression:

pH = - log [OH-].-------------(1)

the pH of acidic buffer =pka+log[ acid/salt]

the pH of basic buffer =pkb+log[ base/salt]

Given that Kb=1.8x10^-5

                 base=0.27M

                 salt=0.18M

first, we have to calculate the value of kb,

pkb=−log[1.8×10 ^−5]

pkb=4.74

The pH of buffer=pkb+log[base/salt]-------------(2)

We find out the value of kb and now substitute it in equation(2)

pOH=4.74+log[ 0.27/0.18]

​=4.74−0.176=4.92

pH=14−4.92=9.08

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Answer:

The answer is d

Explanation:

The change in temperature and activation energy as compared impact the reaction rate should be considered option d.

In the case when the temperature is increased so there should be molecule gain energy and due to which it moved faster.

So there should be the greater the temperature, the higher should be probability so here the molecule should be movement for the activation energy for the reaction.

Hence, the option d is correct.

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IBUPROFEN-400MG + PARACETAMOL-325MG is the scientific name Flexon.

Flexon is the trademark for a shape memory alloy of titanium that is used to make eyeglass frames.

The metal alloy used by Flexon in their eyewear was actually destined for a very different path when, in 1961, US Naval Scientists creating a missile heat shield discovered that the alloy they were using automatically returned to its original shape, even after being hit by a hammer.

Flexon is the trademarked name for a special material that is used to make frames for spectacles. It is light and extremely flexible. If it is bent it will 'remember' its original shape and return to it.

Flexon eyeglasses are all made of memory metal titanium.

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The pH of a buffer solution : 4.3

Given

0.2 mole HCNO

0.8 mole NaCNO

1 L solution

Required

pH buffer

Solution

Acid buffer solutions consist of weak acids HCNO and their salts NaCNO.

\(\tt \displaystyle [H^+]=Ka\times\frac{mole\:weak\:acid}{mole\:salt\times valence}\)

valence according to the amount of salt anion  

Input the value :

\(\tt \displaystyle [H^+]=2.10^{-4}\times\frac{0.2}{0.8\times 1}\\\\(H^+]=5\times 10^{-5}\\\\pH=5-log~5\\\\pH=4.3\)

The molar mass (in units of g/mol) of the solute is 175 g.

The molar mass of atoms of an element is given by means of the relative atomic mass of the element accelerated via the molar mass steady, The definition of molar mass is genuinely the variety of grams that one mole of a substance weighs. every other definition of molar mass, is the sum of the atomic weights of the atoms that make up a molecule

One mole of any substance is equal to the Avogadro wide variety. This range as price 6.023 instances 10^{23}. it's miles useful to measure the goods in any chemical reaction. accordingly 6.023 instances 10^{23} of atoms, molecules or debris are 1 mol of atoms, molecules etc.

Solution;

T f = 2.34° C

mass of ascorbic acid = 55g

weight of solvent = 250 g = 0.25 kg

K f = 1.86 °C/m

Molar mass of the ascorbic acid by using formula

        T f = m*K f

molality = \(\frac{mass of ascorbic acid }{molar mass * weight}\)

So, molar mass = 1/0.25 * 55/molar mass *1/0.25 * 1.86  °C/m

Molar mass = 1/0.25 *55/2.34 * 1.86 1.86 °C/m

molar mass = 174.8 = 175 g/mol

Hence answer is  175 g/mol

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Answer:

1 mole of Sulfuric Acid

Explanation:

Given

\(Compound = H_2SO_4\)

\(Grams = 98.078\)

Required

Determine the amount of moles

First, we need to determine the atomic mass of the acid.

\(H = 1.008g\) -- Hydrogen

\(S = 32.065\) --- Sulfur

\(O =15.999\) -- Oxygen

So:

\(H_2SO_4 = H * 2 + S + O * 4\)

\(H_2SO_4 = 1.008 * 2 + 32.065 + 15.999 * 4\)

\(H_2SO_4 = 2.016 + 32.065 + 63.996\)

\(H_2SO_4 = 98.077g\)

Number of moles (n) is then calculated as thus:

\(n = \frac{Grams}{Atomic\ Mass}\)

\(n = \frac{98.078g}{98.077g}\)

\(n = \frac{98.078}{98.077}\)

\(n = 1.00001019607\)

\(n =1\) (approximated).

Hence, there is 1 mole of Sulfuric Acid

Assuming there are no other changes to the system, the change in internal energy is 0 joules.

This is because the internal energy of a system is a measure of the total amount of energy stored within the system. If there are no changes to the system, then the amount of energy stored in the system remains the same and thus the change in internal energy is 0 joules.

Is a unit of measurement used to determine the total amount of energy stored within a system. This amount of energy varies depending on the work done in the system, as well as the transferred between the system and its environment. When dealing with a closed system, i.e., a system that is not affected by any external change, the change in internal energy is zero.

This is because in a closed system, there is no work done and no heat transferred to the system. This means that the total amount of energy stored within the system does not change, so the change in internal energy is zero.

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Propanal will form silver mirror upon heating with Tollen's reagent while propanoic acid will not respond.

Answer:

Therefore mole ratio is \(H_{2}O\) : \(KAl(SO_{4} )_{2}\) is 12 :1  

Empirical formula is \(KAl(SO_{4} )_{2}. 12 H_{2}O\).

Explanation:

The chemical formula of a hydrate  

Moles of anhydrous \(KAl(SO_{4} )_{2}\)  

Molar mass of \(KAl(SO_{4} )_{2}\) = 258.21 g /mol  

Mass of anhydrous \(KAl(SO_{4} )_{2}\) = [mass of aluminum cup + alum after 2nd heating] –[ mass of empty cup]  

                                                   = 3.5 g – 2.4 g  

                                                   = 1.1 g

Moles of \(KAl(SO_{4} )_{2}\)= mass / molar mass  

                                    = 1.1 g / 258.21 g per mol  

                                   = 0.00426 mol \(KAl(SO_{4} )_{2}\)

The mole ratio of the H2O to \(KAl(SO_{4} )_{2}\)

Mole ratio = moles of H2O/ moles of \(KAl(SO_{4} )_{2}\)

                  = 0.05 mol H2O / 0.00462 mol \(KAl(SO_{4} )_{2}\)

                 = 11.7

We can round the 11.7 to closest whole number = 12

Therefore mole ratio is \(H_{2}O\) : \(KAl(SO_{4} )_{2}\) is 12 :1  

Empirical formula = \(KAl(SO_{4} )_{2}. 12 H_{2}O\)  

So we have 12 moles of water as the water of hydration in the empirical formula.  

Alum hydrate is that the white crystalline solid after heating it'll start melting due to the water of hydration present in it then again solid will remain within the aluminum cup once all the water is given off within the sort of vapors.  

b) if the scholar used 2.20 g of the sample but within the calculation, he started with 2.0 g sample then  

when the mass of water is calculated using this data the mass of water is going to be higher therefore it gives more moles of water within the hydrate.  

So the final answer is going to be artificially high.

Answer:

Refer to the attachment

Answer:

like what happens In 3 hours

0.436% KCN solution containing 501 mg of KCN has a mass of approximately 115 grams.

To calculate the mass of a 0.436% KCN solution containing 501 mg of KCN, we need to utilize the mass percent concentration formula. The mass percent concentration is given by:
Mass Percent = (Mass of Solute / Mass of Solution) × 100
In this case, the mass percent concentration is 0.436%, and the mass of solute (KCN) is 501 mg. We can rearrange the formula to solve for the mass of the solution:
Mass of Solution = Mass of Solute / (Mass Percent / 100)
Substituting the given values:
Mass of Solution = 501 mg / (0.436 / 100)
Mass of Solution ≈ 114900 mg
To express the mass to three significant figures and convert to grams:
Mass of Solution ≈ 115 g
So, a 0.436% KCN solution containing 501 mg of KCN has a mass of approximately 115 grams.

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Molecular level: A person's blood cells having blood type A, B, or O is a genetic description at the molecular level. It involves the presence or absence of specific alleles that determine the blood type.

Molecular level: The presence of an enzyme in type A individuals that adds a sugar group to the blood cell membrane is a molecular-level genetic description. It relates to the specific function of an enzyme determined by genetic variation. Population level: The prevalence of blood type B in people from Central Asia is a genetic description at the population level. It refers to the frequency distribution of a particular blood type within a specific geographic region. Cellular level: A rabbit carrying two copies of the Himalayan coat color allele having black paws is a genetic description at the cellular level. It involves the expression and manifestation of a specific coat color allele in the cells of the rabbit. Molecular level: The temperature-dependent functionality of the enzyme responsible for black pigment in rabbits is a genetic description at the molecular level. It indicates the specific conditions under which the enzyme can effectively carry out its function. Population level: The statement that one percent of all rabbits carry a Himalayan coat color allele is a genetic description at the population level. It represents the frequency of a particular allele within a rabbit population.

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Answer:

Protein

Explanation:

Protein is used to make insulation (like fat) and is used to store energy taken form food (please tell me if this works)

Protein which is made up of amino acids is a  type of biomolecule that can be used for energy storage and insulation.

Amino acids are defined as the substances which are considered to be the monomers of proteins.Every amino acid has the same structure consisting of a central carbon which is bonded to an amino group , carboxyl group and a hydrogen.

Each amino acid also has another atom or a group of atoms bonded to the alpha carbon which are also known as the R group or the variable group of the side chain.There are 20 common amino acids present in natural proteins and each amino acid has the same backbone.

The sequence and number of amino acids determines protein's shape,size and also its function. Each amino acid is attached to the other by a covalent bond formed by a dehydration reaction.

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Answer:

3. Triple Beam Balance

Explanation:

A triple beam will be most suitable for measuring the mass of a small stone because it is very accurate, and has a reading error of +/- 0.05 gram.

Answer: Plants have the ability to make the right amount of glucose to be used on nights or when there is a cloudy day. It can be kept in the plants leaves and other areas.

Explanation: pls mark brainiest thankss!!

Answer:

Tungsten

Explanation:

The appearance and observable qualities of matter are considered to be its physical attributes. Colour, smell, taste, solubility, etc. An attribute that appears during a chemical reaction is known as a chemical property. A few examples include pH, reactivity, and flammability, etc. The correct option is B.

The chemical makeup or content of matter are not altered after a physical transformation.  The internal makeup is unaffected as molecules rearrange themselves during this transformation. The chemical attribute is unaffected by a physical change.

Here both crushing a mineral into powder and picking up a paper clip with a magnet are physical changes.

Thus the correct option is B.

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Answer:

12.7 L (3 s.f.)

Explanation:

Since it is an ideal gas, we can apply the ideal gas law:

\(\boxed{pV=nRT}\)

☆ where p= pressure

V= volume

n= number of moles

R= ideal gas constant

T= temperature

Substitute all the given information into the formula:

2V= 1(0.08206)(310)

2V= 25.4386

V= 25.4386 ÷2

V= 12.7 L (3 s.f.)

Further explanation:

The ideal gas constant, R, has different values depending on what units are being used. Two examples are listed below:

\(• \: 0.08206 \: L \: atm ^{ - 1} \: mol \: K\)

\(• \: 8.314 \: J \: {mol}^{ - 1} \: {K}^{ - 1} \)

In the above question, we use the value 0.08206 because the pressure was given in atm and the temperature was given in Kelvin. Thus, the unit used for volume is L.

Answer: 12.7 L

Explanation:

P=2.0atm

V= ???

n=1.0 mol

R= 0.0821

T= 310K

PV=nRT--> (2)V=(1)(0.0821)(310)

                     V=12.7 L

Answer:  The mass M = 9g, so G = 9g x 9.8 m/s² = 88.2gm/s², or 88.2 newtons. Insert the tension and gravitational force you just calculated into the original equation: -F = T + G = 18N + 88.2N = 106.2N. The force is negative because the object in the pulley system is accelerating upwards.

Explanation:

Answer:

in the periodic table we can see that the ions of Cl is greater than the ions in Na

Cl- ion is bigger than Na+ ion because of the presence of more number of electrons.

The atomic number of sodium+ ion is 10 means it has 10 number of electrons which can accommodate into 2 shells or orbits while on the hand, chlorine- ion has atomic number 18 means it has 18 number of electrons which can be accommodate into 3 shells or orbit.

So there is one shell more in chlorine ion as compared to sodium ion which make the size of chlorine ion large so we can conclude that chlorine ion is bigger than sodium ion.

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1. 4

2. 4

3. 2

4. 2

Given

Reaction

2H₂+O₂⇒2H₂O

Required

Number of atoms

Solution

In compounds, the number of atoms of the constituent components in the form of elements is usually indicated by a subscript after the element symbol, while the number in front of the compound which is the coefficient indicates the number of molecules of the compound.

In chemical reactions, the reactants are on the left and the products on the right

1. Number of Hydrogen in reactants

2 molecules x 2 atoms = 4 atoms

2. Number of Hydrogen in products

2 molecules x 2 atoms = 4 atoms

3. Number of Oxygen in reactants

1 molecules x 2 atoms = 2 atoms

3. Number of Oxygen in products

2 molecules x 1 atoms = 2 atoms

The reaction is said to be balanced because the number of atoms of the element is the same between the reactants and products

The unknown metal X is iron metal as it reacts with copper sulfate solution but does not react with magnesium chloride.

Some metals are very reactive while other metals are less reactive or unreactive. When a more reactive metal is added to the solution of a less reactive metal, then the more reactive displaces the less reactive metal from its solution is known as a displacement reaction.

The general form of a single displacement reaction can be represented as:

\(A + BC \longrightarrow B + AC\)

When iron is placed in copper sulfate (CuSO₄) solution then the blue color of the copper sulfate solution turns a red-brown coating of copper metal deposited on the iron.

\(CuSO_4 (aq)+ Fe (s)\longrightarrow FeSO_4 (aq) +Cu(s)\)

Iron lies above the electrochemical series and is more reactive than copper. So it reacts with copper sulfate but does not give any reaction with magnesium chloride.

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Answer:

Explanation:

Here, we want to select the most important information piece to determine saturation

The best way to check for this is to check the kind of bonds between the carbon atoms in the molecule

When there are double or triple covalent bonds between the carbon atoms, then, we can be sure that there is a degree of unsaturation (alkenes, alkynes)

If we have single bonds only, then the molecule is saturated

Answer:

-6.31°C

Explanation:

To solve this problem, we can use the principle of heat transfer:The heat gained by the lead (q_lead) equals the heat lost by the water (q_water).The formula to calculate heat transfer is:

q = m * c * ΔTWhere:

q = heat transfer

m = mass

c = specific heat

ΔT = change in temperatureFor the lead:

q_lead = m_lead * c_lead * ΔT_leadFor the water:

q_water = m_water * c_water * ΔT_waterGiven values:

m_lead = 322 g

c_lead = 0.138 J/gºC

ΔT_lead = T_final - T_initial_lead (unknown)

m_water = 264 g

c_water = 4.18 J/gºC (specific heat of water)

ΔT_water = T_final - T_initial_water = 46°C - 25°C = 21°CSince the heat gained by the lead is equal to the heat lost by the water, we can set up the equation:

m_lead * c_lead * ΔT_lead = m_water * c_water * ΔT_waterSubstituting the given values:

322 g * 0.138 J/gºC * ΔT_lead = 264 g * 4.18 J/gºC * 21°CSimplifying the equation:

44.436 J/ºC * ΔT_lead = 2325.12 J/ºCDividing both sides of the equation by 44.436 J/ºC:

ΔT_lead = 2325.12 J/ºC / 44.436 J/ºC ≈ 52.31°CFinally, we can find the initial temperature of the lead:

T_initial_lead = T_final - ΔT_lead

T_initial_lead = 46°C - 52.31°C ≈ -6.31°CTherefore, the initial temperature of the lead was approximately -6.31°C.