A sample of hydrogen gas occupies a volume of 300 ml at 1.2 bar pressure and 25 degree C. Calculate its volume at 0.45 bar pressure and 700 C

Answer:

1.342g of picolinic acid and 6.743mL of 1.0M NaOH diluting the mixture to 100.0mL

Explanation:

The pKa of the picolinic acid is 5.4.

Using Henderson-Hasselbalch formula for picolinic-picolinate buffer:

pH = pKa + log [Picolinate] / [Picolinic]

Where [] could be taken as moles of each species

5.61 = 5.4 + log [Picolinate] / [Picolinic]

0.21 = log [Picolinate] / [Picolinic]

1.62181 = [Picolinate] / [Picolinic] (1)

Now, both picolinate and picolinic acid will be:

0.100L * (0.109mol / L) =

0.0109 moles = [Picolinate] + [Picolinic] (2)

First, as we will start with picolinic acid, we need add:

0.0109 moles picolinic acid * (123.10g/mol) = 1.342g of picolinic acid

Now, replacing (2) in (1):

1.62181 = 0.0109 moles - [Picolinic] / [Picolinic]

1.62181 [Picolinic] = 0.0109 moles - [Picolinic]

2.62181 [Picolinic] = 0.0109 moles

[Picolinic] = 4.157x10⁻³ moles

And:

[Picolinate] = 0.0109 - 4.157x10⁻³ moles =

To obtain these moles of picolinate ion we need to make the reaction of the picolinic acid with NaOH:

Picolinic acid + NaOH → Picolinate + Water

That means to obtain 6.743x10⁻³ moles of picolinate ion we need to add 6.743x10⁻³ moles of NaOH

6.743x10⁻³ moles of NaOH that is 1.0M are, in mL:

6.743x10⁻³ moles * (1L / 1mol) = 6.743x10⁻³L * 1000 =

Thus, we obtain the desire moles of picolinate and picolinic acid to obtain the buffer we want, the last step is:

Following are the calculation to the mass of picolinic acid:

Let pKa of picolinic acid \(= 5.52\)

form the buffer:  \(\bold{pH = pKa + \log(\frac{A-}{ HA})}\)

Acid concentration\(= 0.109\)

We will require the conjugate, which would be formed by interaction of picolinic acid and NaOH.

calcultion to the need:

\(pH = pKa + \log(\frac{A-}{ HA})\\\\5.61 = 5.52 + \log(\frac{A-}{ HA})\)

 solve for A- by using antilog

 \(0.09 = \log(\frac{A-}{ HA})\\\\1.230= \frac{A-}{HA}\)

 When

\(HA = 0.109\\\\A- = 0.134\)

If \(V = 100 ml\)then

 \(n A- = M\timesV = 0.134 \times 0.1 = 0.0134 \ mol\ of\ A-\)

needed  

\(HA + NAOH \to H_2O + Na^+ \ and \ A-\)  

therefore,

ratios =1:1

we need 0.0134 mol of NaOH  

\(n = M\times V \\\\V = \frac{0.0134}{1} = 0.0134 \ liter \ of\ NaOH\)

 but you also want \(0.109 M\) of free picolinic acid so  

\(n = M\times V = 0.109\times 0.1 = 0.0109\ mol \ of \ Acid\)

 Therefore:  

\(n \ acid = 0.0109 + 0.0134\ mol = 0.0243 \ mol\ of \ acid\)  

Preparation:

 by add volume (19.07) in NaOH

M = 1.0 to the beaker, and by add water until the beaker marks 1  L

 Then add 0.0243 mol of picolinic acid

 \(\to m = 0.0243 \times 123 = 2.9889\ grams\) of picolinic acid  

stir and pH will be that of buffer.

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In studying the influence of environmental pH on peroxidase activity, researchers can repeat the experiment without guaiacol, which will reveal the effect of guaiacol on reaction rates.

One of the investigators' proposal to use oxygen gas production to measure reaction rates leads to a change in the dependent variable.

In the first experiment the dependent variable was the volume of guaiacol and in the second experiment the dependent variable will be oxygen production.

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Answer:

45

Explanation:

I am math teacher

Answer:

strong and rigid

Explanation:

The crystal structure of ionic compounds is strong and rigid. It takes a lot of energy to break all those ionic bonds. As a result, ionic compounds are solids with high melting and boiling points. You can see the melting and boiling points of several different ionic compounds in the Table below

0.6844

Don't ask how I got the answer, just look up Omnicalculator grams to moles or maybe keep a diagram handy like this one

With an acid dissociation constant (Ka) of 0.00361 and a concentration of this weak acid of 0.155 M, the percent ionization is roughly 11.68%.

The percent ionization (% ionization) of a weak acid and its acid dissociation constant (Ka) are connected as follows:

Ka = \((H^{+}) (A^{-})\)/(HA)

\([H^{+}]\)/[HA] x 100% = % ionization

where \([H^{+} ]\) is the amount of hydrogen ions (measured in M) in the solution, \([A^{-}]\) is the amount of conjugate base (measured in M), and [HA] is the amount of undissociated weak acid (measured in M).

We can use a quadratic equation to determine the concentration of hydrogen ions at equilibrium given that the weak acid's acid dissociation constant (Ka) is 0.00361.

So, using the formula below, we can determine the weak acid's % ionization:

\([H^{+} ]\)/[HA] x 100% = % ionization

\([H^{+} ]\)/c x 100% = % ionization

100% of ionization = (0.0181 M/0.155 M)

Therefore, 11.68% of the acid is ionized.

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J.J. Thomson discovered electrons and their negative charge through the cathode ray experiment, leading to the development of the plum pudding model of the atom.

J.J. Thomson, a British physicist, was the first to discover electrons in 1897.

He conducted the cathode ray experiment to identify the negatively charged particles.

The cathode ray tube is a vacuum-sealed glass tube with two electrodes at each end: a cathode and an anode.

When a high voltage electrical current is applied to the electrodes, the tube glows, indicating that the cathode rays are being emitted from the cathode and traveling through the tube towards the anode.

The cathode rays were found to have a negative charge, according to Thomson.

These rays were identified as particles by the presence of a magnet, which caused the particles to bend in the direction opposite to the magnet's polarity.

This discovery indicated that the particles had a charge on them because they were deflected by the magnetic field, which is only possible if the particles have an electric charge.

Thomson further concluded that these particles were about 1,000 times smaller than hydrogen atoms because of the degree of deflection they experienced in the magnetic field.

Furthermore, Thomson created the plum pudding model of an atom, in which electrons are dispersed throughout a positively charged matrix, based on his findings.

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An error during DNA replication would create a gene mutation.

During DNA replication, the genetic information in a cell is copied to make new DNA molecules. However, mistakes can occur during this process, leading to changes in the DNA sequence, which can result in a mutation. Mutations can also be caused by exposure to environmental factors, such as radiation or chemicals, which can damage the DNA molecule directly or affect the cellular processes involved in DNA replication.

Mutations can have a variety of effects on the organism, ranging from no effect to causing serious health problems or even death. Gene mutations can also be inherited from a parent, which can result in genetic disorders or predisposition to certain diseases. Therefore, it is important to understand the mechanisms of gene mutations and their potential impacts on organisms.

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Answer:

D. section of DNA that codes for a specific trait

Explanation:

Genes are sections of the DNA that codes for a specific trait. They are simply defined as the basic physical and functional unit of hereditary.

Strong base KOH, Sr(OH)2, NaOH, LiOH, Ca(OH)2. Strong acid HBr, HCl, H2SO4. Weak acid H3PO4. Weak base NH3.

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Answer:

Titration of 50.00 mL of 0.0521 M sodium oxalate, Na2C2O4, required 38.71 mL of a potassium permanganate solution: 5 C2O42- + 2MnO4- + 16H+ = 2Mn2+ + 10 CO2 + 8H2O Calculate the molarity of the potassium permanganate solution.

Explanation:

If m and n are integers, which of the following must be an even integer? A. 2mn B. mn C. mn+2 d. mn-2 e. 3mn

Answer:

Due to an electron-pair acceptor and donor.

Explanations:

Lewis acid can be defined as an electron-pair acceptor. An example is Hydrogen ion(H+). This is because it is a proton and it distributes positive charge which means that it accepts electrons(negative charge).

Lewis base can be defined as an electron-pair donor. This is because it donates electrons to be accepted by the proton. An example is ammonia(NH3).

Answer:

3 miles?

Explanation:

if you walk one mile North and then turn and walk another two miles you walk 3 miles and then turn around and walk back in the same direction you would end backup at the one-mile Mark he began. So three miles there two miles back

Cassidee traveled a distance of approximately 2.24 miles. Her displacement was approximately 2.24 miles westward.

Cassidee's motion forms a right triangle. Her first leg is 1 mile north, and her second leg is 2 miles west. Using the Pythagorean theorem:

Distance = √(1 mile)² + (2 miles)²

Distance = √1 + 4 = √5 ≈ 2.24 miles.

For displacement, we consider her initial and final positions. The horizontal component (westward) is 2 miles, and the vertical component (northward) is 1 mile. Using the Pythagorean theorem:

Displacement = √(Horizontal)² + (Vertical)²

Displacement = √2² + 1²

Displacement ≈ √4 + 1 = √5 ≈ 2.24 miles.

However, displacement needs a direction. Since she moves west, displacement is -2 miles west.

In summary, Cassidee traveled a distance of approximately 2.24 miles. Her displacement was approximately 2.24 miles westward.

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Answer:

Atomic element

Explanation:

Carbon is considered an atomic element. Therefore, the correct option is option A among all the given options.

Chemical element carbon has the atomic number six and the letter C assigned to it. It has a tetravalent atom, which means that four of its electrons may be used to create covalent chemical connections. It is nonmetallic. The periodic table's group 14 includes it. The crust of the Earth contains 0.025 percent carbon. There are several ways in which the carbon atoms can connect, giving rise to different allotropes of carbon. Amorphous carbon, diamond, graphite, and fullerenes are examples of well-known allotropes. Carbon is considered an atomic element.

Therefore, the correct option is option A among all the given options.

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Approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.

To determine the number of molecules of HCl required to form 34.52 g of MgCl₂, we need to use the molar mass and stoichiometry of the balanced equation:

Mg(OH)₂(s) + 2 HCl(aq) → 2 H₂O(l) + MgCl₂(aq)

The molar mass of MgCl₂ is 95.21 g/mol.

First, we need to calculate the number of moles of MgCl₂ formed:

Moles of MgCl₂ = mass of MgCl₂ / molar mass of MgCl₂

Moles of MgCl₂ = 34.52 g / 95.21 g/mol

Moles of MgCl₂ = 0.363 mol

According to the balanced equation, the stoichiometric ratio between HCl and MgCl₂ is 2:1. Therefore, the moles of HCl required can be calculated as follows:

Moles of HCl = 2 * Moles of MgCl₂

Moles of HCl = 2 * 0.363 mol

Moles of HCl = 0.726 mol

To calculate the number of molecules, we need to use Avogadro's number, which is approximately 6.022 x 10^23 molecules/mol.

Number of molecules of HCl = Moles of HCl * Avogadro's number

Number of molecules of HCl = 0.726 mol * 6.022 x 10^23 molecules/mol

Number of molecules of HCl = 4.37 x 10^23 molecules

Therefore, approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.

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NaCl is more reactive than NaBr because Cl is more electronegative than Br and it is smaller than Br, thus, can be easily attack other compounds.

NaCl is an ionic compound formed thorough the electrons loss from the metallic sodium to chlorine. Sodium  has one valence electron which can be easily lost to electronegative non-metals such as halogens.

Halogens such as chlorine, fluorine etc. are highly electronegative and easily gain one electrons from metals. The electronegativity of atoms decreases down a group. Thus, F is much more electronegative than Cl which is more electronegative than Br than I.

NaBr is an ionic compound similar to NaCl. However, Br is bigger in size and less electronegative than Cl that's why it is chemically less reactive in comparison to NaCl.

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The atomic number of bromine is 35. Thus the total number of electrons is 35. The number of core electrons is 28.

Bromine is 35th element in periodic table. It is a nonmetal and is placed in the 17th group called halogen group. Bromine relatively electronegative in nature and form ionic compounds.

The atomic number of an atom is the number of its total electrons in the neutral state. The electrons which are occupied in the higher energy levels that is in the outer orbitals far from the nucleus is called valence electrons. All other electrons are called inner electrons or core electrons.

Bromine contains total 35 electrons. Out of which 7 are valence electrons. Thus, the number of core electrons in the ground state of bromine is 35 -7 = 28 electrons.

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Answer:

A formula car is a single seat, open cockpit, open wheel racing car with substantial front and rear wings and an engine positioned behind the driver intended to be used in competition.

we would need 2625.13 grams (or 2.62513 kilograms) of NaCl.

To calculate the mass of NaCl required to produce a 26.4 mol/L solution with a 1.7 L volume, we need to use the formula that relates the mass of solute, moles of solute, and molarity:Molarity (M) = moles of solute / liters of solution Rearranging this formula, we get:moles of solute = Molarity (M) x liters of solutionWe can use this formula to find the moles of NaCl needed:moles of NaCl = 26.4 mol/L x 1.7 L = 44.88 molNow, we can use the molar mass of NaCl to convert from moles to grams. The molar mass of NaCl is 58.44 g/mol:mass of NaCl = moles of NaCl x molar mass of NaClmass of NaCl = 44.88 mol x 58.44 g/mol = 2625.13 gTo produce a 26.4 mol/L solution with a 1.7 L volume.

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The rate of reaction is

1.17*10^5 J/mol

By Arohenius equation, we have

\(.$$\log \left(k_2 k_1\right)=\frac{E_a}{2 \cdot 303 R}\left(\frac{T_2-T_1}{T_1 T_2}\right)$$Given, $k_1=4.85 \times 10^{-5} \mathrm{~L}$ mol.s$$T_1=195^{\circ} \mathrm{C}=(273+195) \mathrm{K}=468 \mathrm{~K}$$$$\begin{aligned}& k_2=8.80 \times 10^{-3} \frac{\mathrm{L}}{\text { mil.s}} \\& T_2=258^{\circ} \mathrm{C}=(273+258) \mathrm{k}=531 \mathrm{~K}\end{aligned}$$\)

\($$\begin{aligned}& \therefore \log \left(\frac{8.80 \times 10^{-3}}{4.85 \times 10^{-5}}\right)=\frac{E a}{2.303 R}\left(\frac{531.468}{488 \times 531}\right) \\& \Rightarrow \log (181.44)=\frac{E_a}{2.303 R}\left(\frac{63}{248,508}\right) \\& \Rightarrow E_a=\log (181.44) \times \frac{248508}{63} \times 2.303 \times 8.314 \\& =170,595.94 \mathrm{~J} / \mathrm{mal} \text {. } \\& =1.71 \times 10^5 \mathrm{~J} / \mathrm{mol} \text { (aru) } \\&\end{aligned}$$\)

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Answer:Deciduouse forest

Explanation:desert is too hot for snow, The rain forest always rains, Savannas are always warmer in climate.

Answer:

A

Explanation:

The carrying capacity of the area was reduced in the year 10 according to the graph that shows the number of foxes on the island over a span of 15 years.

The graph shows a population of foxes over a span of 15 years. The y-axis represents the number of foxes on the island, while the x-axis represents time. The study began with the earlier 0 and ran until the start of year 15. According to the graph, the carrying capacity of the area was reduced in the year 10.

In the graph, it is shown that the population of foxes on Sunday Gill island had a significant increase from year 0 to year 3. After year 3, the fox population started to decrease and then remained fairly constant until year 10. After year 10, the population of foxes on the island started to decline more rapidly until the end of the study in year 15

This decline in the population of foxes on the island is most likely due to the reduction in carrying capacity of the area. Carrying capacity refers to the maximum number of individuals that an environment can sustain. When the carrying capacity of an environment is reached, it means that the environment can no longer provide the necessary resources to sustain the population.  

There are various factors that can cause a reduction in carrying capacity, such as environmental degradation, competition for resources, or a natural disaster. In this case, it is not clear what caused the reduction in carrying capacity in year 10, but it is likely that it was due to some environmental factor that impacted the availability of resources for the fox population.
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Answer:Explanation:

250.ml of a 0.400 divide

Answer:

E Reactivity

Explanation:

Reactivity is not one of the properties shared by metals with one another.

The reactivity of a substance is its ability to combine with other substances. Reactivity is not used to measure the physical property of a metal.

The physical properties observed in metals derives from the metallic bonds within their atomic structure.

Conductivity, luster, malleability, ductility, magnetism etc. are some of the other physical properties of metals.

Answer:

B

Explanation:

When ice melts at 0oC, average kinetic energy of the molecules will remain the same.

Answer:

Chlorine

Explanation:

Chlorine is the element located in period 3, group 17 of the periodic table.

Answer:

1st one

Explanation:

Answer:

Colder, less

Explanation:

I did the test