a student uses a solution of potassium hydroxide to titrate a solution of nitric acid. which question is the student trying to answer?(1 point)

The pH at the equivalence point will be 3.7.

Methyl orange is a commonly used pH indicator in titrations because the color change is readily noticeable. It is often used for acid titrations because it changes color at weakly acidic pH. Methyl orange turns red in acidic media and yellow in basic media. Methyl orange is not a natural indicator. It is actually synthesized from sodium nitrate, dimethylaniline, and sulfanilic acid. A diazonium salt is an organic compound having functional groups conforming to the generalized form R−N⁺2X⁻, where R represents any organic group such as alkyl or aryl.

Methyl Orange changes from a basic color to an acidic color during strong acid/weak base titrations, making it a useful chemical indicator. In acidic or basic media, methyl orange exhibits red and yellow colors. During the titration, the solution initially appears yellow due to the high pH.

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0.0163 mol of sodium hydroxide needed to be added 0.500 l of 0.267 m hydrocyanic acid solution to prepare a buffer with a pH of 10.400.

Ka HCN= 4x[tex]10^{-10}[/tex]

Pka HCN = 9.4

pH = Pka + log [tex]\frac{A}{HA}[/tex]

10.400 = 9.4 + log        [tex]\frac{A}{HA}[/tex]

log        [tex]\frac{A}{HA}[/tex] = 1

       [tex]\frac{A}{HA}[/tex] = 10

let W be the mole of NaOH be used  

NaOH =  [tex]\frac{w mol . 1000ml}{500 .1L}[/tex] = 5 w mol

NaOH + HCN → NaCN +H2O

thus 5 mole of NaOH combines with 5 mole of HCN to for 5 mole of NaCN

[tex]A^{-}[/tex] = (0.1 +5w) M

HA = 0.267 -5w) M

       [tex]\frac{A}{HA}[/tex] = 0.1 + 5w/ 0.1 -5w

10 = 0.1 +5w ? 0.1 - 5w

0.1 +5 w = 10 (0.1- 5w)

0.9 = 55w

w = 0.0163 mol

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The number of photons required with a wavelength of 749 nm are needed to melt 445 g of ice is 5.12 × 10²³.

The energy of one photon is given as,

E = (h × C) / λ

E = (6.626 × 10⁻³⁴ × 3 × 10⁸ m/s) / (749 nm × 10⁻⁹ nm/m)

⇒ E = 0.02653 × 10⁻¹⁷ = 2.65 × 10⁻¹⁹ J

The enthalpy of fusion of water is 333.55 J/g.

To melt 445 g of ice, the energy needed = 445 g × 333.55 J/g = 135755 J

Hence, the number of photons required = (135755 J) / (2.65 × 10⁻¹⁹)

                                                                   = 51228.301 × 10⁻¹⁹

                                                                   = 5.12 × 10²³

Hence the number of photons required is 5.12 × 10²³.

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Answer: it would be B

Explanation:

I took the test

Assuming complete combustion, the stated statement indicates that 24 g of methane were consumed.

In the chemical process of burning, an item swiftly combines with oxygen to produce heat. The initial substance and the supply of oxygen are referred to as fuel and oxidizer, respectively. Despite typically being a liquid, fuel for airplane propulsion can also occasionally be a solid, liquid, or gas.

Briefing:

CH4 + 2O₂——————-> CO₂ + 2H₂O

1 mole of methane, or 16 g, will yield =2 x 18 = 36 g of water.

Thus, = 16/36 x 54 = 24 g of methane will be converted into 54 g of water.

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The final temperature of the mixture is -9.1°C.

Higher body temperatures release heat while lower body temperatures absorb it. The law of conservation of energy is demonstrated by the calorimetric principle, which states that the total amount of heat lost by a hot body is equal to the total amount of heat gained by a cold body.

Here,

Mass of water [tex]m_{w}[/tex] =500g

Mass of ice [tex]m_{i}[/tex] = 100g

Specific heat of water = 1 cal g⁻¹°c⁻¹

Specific heat of ice = 80 °cal g⁻¹

Let T represent the mixture's final temperature.

How much heat water loses

[tex]m_{w}[/tex] [tex]s_{w}[/tex](∆T)w = 500×1(50-T)

Amount of heat that ice absorbs

[tex]m_{i} L_{fi} + m_{i} s_{w}[/tex](∆T)i = 100×80×100×1(T-0)

In accordance with the calorimetry principle:

Heat gained minus Heat Lost

500×1(50-T) = 100×80+100×1(T-0)

500(50-T) = 8000+100T

2500-500T = 8000+100T

2500-8000 = 100T+500T

-5500 =600T

T = -5500/600

T = -9.1°C.

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DNA damage leads to accumulation of ____phosphorylated____ p53, which ___increases____ production of a CDK inhibitor to ___halt_____ the cell cycle.

Phosphorylation is the attachment of phosphate groups to molecules or ions. This process and its reverse dephosphorylation are widely used in biology. Phosphorylation of proteins often activates many enzymes. Protein kinases are activated by phosphorylation, activating a series of events that lead to phosphorylation of various amino acids.

When activated, p53 induces the expression of various gene products, causing either prolonged cell cycle arrest in G1, preventing proliferation of damaged cells, or apoptosis to remove damaged cells from the body .

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The pH when 88.5 g of HBr is added will be 7.224

Molarity of HOCl = 0.332 M

Molarity of NaOCl = 0.405 M

Mass of HBr = 88,5 g

pH after adding 88.5 g HBr = ?

For acidic buffer we use the following formula:

   pH =pKa + log (salt / acid)

pKa of HOCl = 7.54

    pH = 7.54 + log (0.405 / 0.332)

    pH = 7.54 + log 1.22

    pH = 7.54 + 0.0864

    pH = 7.623

Calculate the pH after adding 88.5 g HBr

First, calculate the number of moles of HBr added

    number of moles = mass / molar mass

    number of moles of HBr = 88.5 g / 80.91 g/mol

    number of moles of HBr = 1.094 mol

Now the acidity of the solution will be:

   acidity = 0.332 + 1.094

   acidity = 1.426 mol

   excess amount of salt =  1.094 - 0.405

   excess amount of salt = 0.689 mol

   pH = 7.54 + log (0.689 / 1.426)

   pH = 7.54 + log 0.483

   pH = 7.54 + (-0.316)

   pH = 7.224

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Compound a is a primary amine compound b is a secondary amine compound c is a tertiary amine the common name for the amine d is ammonia

Amines are the organic compound that contain nitrogen atom with a lone pair and they are derived from ammonia means NH₃ in which one or more hydrogen atom is replaced by an alkyl or aryl group and they are known as alkylamines and arylamines

Primary amines are formed when one hydrogen atom in ammonia is substituted by an alkyl or aromatic group and secondary amine have two carbon bonded to the nitrogen and tertiary amines have the three carbon bonded to the nitrogen and ammonia is the gas made up of nitrogen and hydrogen

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The pH of clean water increases when an acid is introduced. The opposite is true if a base is introduced to pure water. A solution's hydronium ion concentration must fall as the concentration of hydroxide ions rises.

If there are more hydrogen ions than hydroxide ions in a solution (i.e., pH pOH), the solution is acidic. Since the concentration of hydrogen and hydroxide ions in pure water is constant, even when the pH changes, the water remains neutral (pH = pOH).

Bases and Acids

An acid is a chemical that, when introduced to pure water, will cause the pH to fall. In a similar way, a base is something that will raise the pH of water by 4.

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When 1.00 L of a 0.500 M LiBr solution is tripled by dilution with water . the number of moles of  lithium in new solution is 0.5 moles.

given that :

volume = 1.00 L

molarity = 0.500 M

The solution is tripled by dilution but there will be no effect in number of mole by the dilution.

the number of moles = molarity × volume in L

the number of moles = 1 × 0.500

the number of moles = 0.5 mol

Thus, When 1.00 L of a 0.500 M LiBr solution is tripled by dilution with water . the number of moles of  lithium in new solution is 0.5 moles.

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Answer: D)Uranus

Explanation:

The outer planets, Mars, Jupiter, Saturn, Uranus, and Neptune, are all known as superior planets because their orbits are farther from the sun than the Earth's.

The outer planets are Jupiter, Saturn, Uranus, Neptune, and Pluto.

Answer: D: Uranus

Explanation:

The temperature of the metal varied more than the temperature of the water, but the metal also lost heat generated as the water acquired it.

Some of the nearly diamond-hard wear plates used in industrial applications start to weaken between 280° and 350°F. At 280°F, pork butt can be cooked. In general, there is good likelihood that a particularly hard steel component will soften when it is subjected to high temperatures.

Steel emits colors that are incandescent above 800 degrees Fahrenheit. Steel gets an ever brighter shade of red between 1000 and 1500 degrees Fahrenheit. Steel first becomes orange and then yellow between 1600 and 1900 degrees Fahrenheit.

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Answer:

Solids have a well defined shape and this -the shape- is "independent" of the space, in other words if we take a rock (solid) its shape would be the same (kind of) no matter in which container we put it. The volume is also well defined and easy to measure. We can use a "ruler" to measure the rock. On the other hand, liquids and gases shape will depend on the container (solid container) or their shape will very similar to the solid body containing them; however liquids are more sensible to mechanical forces as Gravity and therefore their shape will result in a combination of the container and the force of gravity (for example), hence if we put water in a cylindrical container but not enough to fully filled then the shape of the liquid will be cylindrical but because gravity it will occupy just the bottom of the container, while the gases are going to expand until cover the whole space of the container.

In short:

Solids: Well defined shape and volume "independent" of the environment

Liquids: Shape dependable of the container, hence not well defined. well define Volume

Gases: Shape and volume dependable of the container.

Calculate the change in temperature produced by the addition of 1 kcal of heat to 100 g of steel.

Csteel= 0.118

Change in temp: 84.7 degrees Celsius

Explanation:

1. (Write down all units.)

q= 1

m= 100

C= 0.118

2. (Remember q=mcΔT)

3. (Calculate the amount needed to raise the 100g by 1 degree.)

100 x 0.118= 11.8 c

4. (Convert kcal to cal.)

1 kcal= 1000 calories.

5. (Divide calories given by calories needed.)

1000/11.8= 84.75

The equation of what happens when iron (III) hydroxide is placed in water is: [tex]Fe (OH)_3 (s) --- > Fe^{3+} (aq) + 3OH^- (aq)[/tex]

Iron (III) hydroxide is a salt that is sparingly soluble when placed in water. This is unlike many salts that are either soluble or insoluble in water.

Because of the partial solubility of iron (III) hydroxide in water, an equilibrium is created between the salt and its ionic component. The equation is as follows:

[tex]Fe (OH)_3 (s) < --- > Fe^{3+} (aq) + 3OH^- (aq)[/tex]

In this equilibrium state, a host of factors exist that could shift the equilibrium to the left or to the right. For example, as more and more salt is added to the water, more of the ionic components are formed.

One other factor that could cause a shift in the equilibrium is temperature. The higher the temperature, the higher the solubility and the more the ionic components that are formed.

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relationship between work pressure and volume can be stated by this formula;

W=PΔV

as we know gas is expanding so it means the work is done by the system

which is shown by a negative sign

W= 138.1 j x 1 L atm / 101.3 j

   = -  1.36 L atm

let's convert torr into atm

P = 783 torr X ( 1 atm/ 760 torr)

    = 1.03 atm

W = -PΔV

- 1.36 L atm = - 1.03 atm x ΔV

ΔV = 1.36 L atm / 1.03 atm

     = 1.32 L  

ΔV = [tex]V_{2}[/tex] - [tex]V_{1}[/tex]

      = [tex]V_{2}[/tex] - 0.0607 L

[tex]V_{2}[/tex] = 1.32 L  +  0.0607 L

       = 1.38 L

the final volume of gas is 1.38 L

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The mass of metal in the compound is 1.504 pounds.

A metal is a substance that, when newly prepared, polished, or fractured, exhibits a lustrous appearance and fairly good electrical and thermal conductivity. Metals are often malleable and ductile (can be formed into wires) (they can be hammered into thin sheets). The metallic link formed by the atoms or molecules of the metal gives rise to these characteristics.

An alloy, like stainless steel, a chemical element, like iron, or a molecular molecule, like polymeric sulfur nitride, are all examples of metals.

Given that;

A scientist measures the mass of a metal to be 682 grams

1000 grams =  1Kg

1kg = 2.2 pounds

hence ;

682 grams will be equal to 0.682 kilograms.

and 0.682 kilograms = 1.504 Pounds

so,

the mass of metal in the compound is 1.504 pounds.

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Answer:

The overall redox reaction is balanced when the number of electrons lost by the reductant equals the number of electrons gained by the oxidant. An electric current is produced from the flow of electrons from the reductant to the oxidant.

Explanation:

N/A

The polarity can be established using the electronegativity (obtained from the periodic table). The best and simplest approach to tell if a molecule is polar or non-polar, though, is to look at its molecule shape.

A molecule is considered to be polar if its core atom has a single pair of electrons. For instance, H2O is polar because the oxygen atom's lone pairs give it a non-symmetrical shape (bent or v-shaped molecular geometry). So, no lone pairs are non-polar, right? Wrong. Not all molecule having a single lone atom at their centre are non-polar. They might be linear or tetrahedral, for sure, but that depends on what is connected to the main atom. For instance, CCl2F2 is polar while CH4 is a non-polar chlorofluorocarbon.

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Cs₂SO₄(aq) + Ba(ClO4)₂(aq) → 2 CsClO₄(aq) + BaSO₄(s) is the balanced equation for the reaction of aqueous cesium sulfate and aqueous barium perchlorate.

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the atomic number of the element x was found to be +7

what is atomic number ?

A chemical element's  nuclear charge number (symbol Z) is the charge number of an atomic nucleus. For conventional nuclei, this is equal to the proton number (np), or the number of protons contained in the nucleus of every atom of that element. The atomic number can be employed to uniquely identify ordinary chemical components. In an ordinary uncharged atom, the atomic number is likewise equal to the number of electrons.

The sum of an ordinary atom's atomic number Z and neutron number N yields the atomic mass number A.

The notion here is that for two covalently bound atoms, oxidation values are assigned by assuming that the more electronegative of the two atoms "takes" all of the bonding electrons shared by the two atoms.

The maximum oxidation state of a specific element happens when all of its valence electrons are "taken" by the atoms to which it is covalently bound.

Since you have X 2 O 7, element X has a + 7 oxidation state.

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The amount of heat required to completely vaporize the sample is 2,692 J

To calculate the amount of heat required use this formula

q = m c Δt

where

q = amount of heat required,

m = mass of the sample

c = specific heat,

Δt= change in temperature

Here,

m = 67.3 g,

final temperature = 140°C,

initial temperature = 100°C,

c = 1.00 J/g°C

To find: Amount of heat required = q = ?

Put the given values in the formula above:

q = (67.3 g) × (1.00 J/g°C) × (140-100)°C

q = 2,692 J

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Information would you need to know about the H₂O₂ solution is through stoichiometry experiment

The ideal gas constant R can be found experimentally by determining the number of moles of gas that occupies a particular measured volume at a known pressure and temprature and the H₂O₂ is a chemical compound used un various chemical reactions and is slightly viscous than water and the experiment by decomposition of hydrogen peroxide and using the ideal gas law rearrangement equation we can calculate the value of r and we will need the information such as concentration, volume and moles of  H₂O₂ to determine its stoichiometry

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The following electron configurations would you expect to belong to a reactive nonmetal is ns² np⁵.

The reactive non metals are halogens. Halogens have seven electrons in the outermost shell and they only need one electron to complete their octet. This property makes halogen more reactive as compared to the other nonmetal.  due to seven electron in outermost shell they readily accept one electron to achieve the stability. The outermost shell electron are called as valence electron. the outmost electronic configuration for halogen mon metals are ns² np⁵.

Thus, The following electron configurations would you expect to belong to a reactive nonmetal is ns² np⁵.

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Five resonance structures are possible for the phosphate ion, PO₄³⁻ and the formal charge are on the each oxygen atom

Resonance structure is the set of Lewis structure that describe the delocalization of electron in a polyatomic ion or a molecule

We can draw five resonance structure for PO₄³⁻ but one of them is  a minor contribution to the resonance hybrid and four oxygen atom single bonded to a phosphorus atom and give every atom an octet and this is not a good structure because it has five atom with formal charges and reduce the number of charges by moving electron to convert a P-O single bond to a P=O double bond and there are four P-O bonds and these are all equivalent and are the major contribution to the resonance hybrid that's why the actual structure is a resonance hybrid of all five structure

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The mass of 1000 coulombs of electric charge are 6.241 ×10^21 C.

What do you mean by electric charge?

Electric charge, a fundamental characteristic of matter possessed by some elementary particles, controls how an electric or magnetic field affects the particles. Positive or negative electric charge exists in distinct natural units and cannot be manufactured or destroyed. Positive and negative charges are the two main categories of electric charges. When two things are reasonably close to one another and one sort of charge is present in excess, they repel one another. When they are relatively close to each other, two things with surplus opposing charges—one positively charged and the other negatively charged—attract to one another.

1 Coulomb of electric charge = 6.241 × 10^18 C.

So, 1000 coulomb of electric charge = (6.241×10^18) ×10^3

⇒6.241×10^21 C.

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The indicated covalent bond is a sigma(single) bond which is a strong bond and cannot easily break.

A covalent bond consists of the mutual sharing of one or more pairs of electrons between two atoms. These electrons are simultaneously attracted to two nuclei. A covalent bond is formed when the electronegativity difference between two atoms is too small for electron transfer to form an ion.

Following are the types of covalent bonds:

CH₃NH₂ is classified as a covalent compound with the IUPAC name methylamine. Each molecule contains one carbon atom, five hydrogen atoms, and one nitrogen atom, all held together by a single covalent bond.

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The temperature is increased to 380. 5 k is 67.68ml.

A hypothetical gas made up of molecules that abide by the following conditions is referred to as an ideal gas: Molecular interactions in ideal gases are neutral. The molecules of an ideal gas wouldn't interact with each other or the container walls other than when they collided in an elastic collision.

Formula

V / T = V₁ / T₁

Given,

V = 56.05 mL

T = 315.1 degrees Kelvin

V₁ = x

T₁ = 380.5  degrees Kelvin

Solution

56.05/315.1 = x/380.5                

0.1779 = x / 380.5  (multiply both sides by 380.5)                      

0.1779 × 380.5 = 380.5x/380.5

x = 67.68 ml

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Answer:

Mg + CuSO₄ = Cu + MgSO₄