the graph below shows a reaction with a catalyst. How did the addition of the cataalyst change the graph

The symbols for some known elements using the periodic table are given below

Groups/Period

H

He

Li

Be

B

C

N

O

F

Ne

Na

Mg

Al

SI

P

S

Cl

Ar

K

CA

An element is a substance which cannot be split into simpler units by any ordinary chemical process

So therefore, the elements in the periodic table are classified based on their increasing atomic numbers.

The group is vertical representation of the elements

The periods is horizontal arrangements of elements in the periodic table

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Answer:

see attachment

Explanation:

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The monomers that react together to form polyurethane polymer are diisocyanate and diol.

Polyurethane polymer is made up of monomers diisocyanate and diol. It is mostly used in home furnishing in flexible form. The structures of monomers are as follows:

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Answer:

Hypernantremia due to excess water loss

A rare disorder that causes the body to make too much urine

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Hypernatremia due to excess water loss is a diabetes insipidus. Hence option A is correct.

Hypernatremia is defined as an increase in serum sodium levels to a level greater than 145 mmol/L. Water leaks from the tissues into the bloodstream as a result of hypernatremia, which can induce cell shrinkage. Additionally, it affects the hormone levels that regulate salt levels, leading to an increase in thirst and more concentrated urine production.

Diabetes insipidus is defined as a rare illness that makes you almost insatiably thirsty and produces copious amounts of urine. A brain tumor that affects the hypothalamus or pituitary gland is one of the three most frequent causes of cranial diabetes insipidus. a severe head injury that damages the pituitary or hypothalamus. complications resulting from pituitary or brain surgery.

Thus, Hypernatremia due to excess water loss is a diabetes insipidus. Hence option A is correct.

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The electrons that enter the transport chain come from NADH and FADH.

The electron transport chain accepts energy-rich electrons from NADH and FADH 2​ whereas ATP is produced in the previous reactions of aerobic respiration. These processes such as glycolysis, the citric acid cycle, the fatty acid beta-oxidation metabolism, and the oxidation of amino acids occurs before electron transport chain. These processes do the function of transfer of electrons and protons to coenzymes.

So we can conclude that the electrons that enter the transport chain come from NADH and FADH.

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Answer:

0.0423 L

Explanation:

Molarity can be represented by the following ratio:

Molarity = moles / volume (L)

You can plug the given values into the equation and simplify to find the volume.

Molarity = moles / volume

0.730 M = 0.0309 moles / volume

(0.730 M) x volume = 0.0309 moles

volume = 0.0423 L

A buffer solution contains an equivalent amount of acid and base. The pH of the solution with an acid dissociation constant (pKa) value of 3.75 is 3.82.

The amount of hydrogen or the proton ion in the solution is expressed by the pH. It is given by the sum of pKa and the log of the concentration of acid and bases.

Given,

Concentration of salt [HCOO⁻] = 0.24 M

Concentration of acid [HCOOH] = 0.20 M

The acid dissociation constant (pKa) = 3.75

pH is calculated from the Hendersons equation as,

pH = pKa + log [salt] ÷ [acid]

pH = 3.75 + log [0.24] ÷ [0.20]

= 3.75 + log (1.2)

= 3.75 + 0.079

= 3.82

Therefore, 3.82 is the pH of the buffer.

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The elements that suits each given property for each of the empty boxes is as described below.

For the first box, the property is that it is a conductor and that it has 2 energy levels. The only possible options here will be Lithium (Li) and Beryllium because they are both conductors and have 2 energy levels. However, among the given elements, only Li is given and as such we will select that.

For the second box, the property is that it is a conductor, it has 3 energy levels and has 2 valence electrons. The only element that falls into this category is Magnesium (Mg).

For the third box, the property is that it is a conductor, it has 3 energy levels and has 1 valence electron. The only element that falls into this category is Sodium (Na).

For the fourth box, the property is that it is not a conductor and has 3 energy levels. The only elements that falls into this category are Silicon(Si), Phosphorus(P), Sulphur(S), Argon(Ar). The only given option is Sulphur(S) and we will pick that.

For the fifth box, the property is that it is not a conductor and has 4 energy levels and 7 valence electrons. The only element that falls into this category is Bromine(Br).

For the sixth box, the property is that it is not a conductor and has 4 energy levels and 5 valence electrons. The only element that falls into this category is Arsenic (As).

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thermite can be produced from aluminum and iron oxide according to redox reaction.

Redox reaction is defined as the the reaction in which one substance get oxidised and other one is reduced. In other words, Oxidation reduction reaction is called redox reaction.

Oxidation is termed as gain of electron and Reduction is termed as lose of electron.

Thermite is a mixture of an oxide of one metal and a powder of another metal.

Aluminium is usually used as a metal that basically decreases the oxide of the metal.

The thermite contains a mass ratio of ferric oxide and aluminium of 3:1.

It is used to weld broken iron pieces thermally. The reduction of aluminium ferric oxide is extremely exothermic, so the iron produced would be in the molten state.

Fe2O3+2Al→Al2O3+2Fe+heat

Thus, redox reaction of aluminum and ferrous oxide produce thermite.

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1. The mole of sugar in the pop is 0.123 mole

2. The value of the sugar in the pop is 11.07 cents

3. The number of particles of the sugar in the pop is 0.74×10²³ particles

4. The concentration of the sugar in the pop is 0.36 mol/L

Mole = mass / molar mass

Mole of sugar (C₁₂H₂₂O₁₁) = 42 / 342

Mole of sugar (C₁₂H₂₂O₁₁) = 0.123 mole

1 mole of sugar = 90 cents

Therefore,

0.123 mole of sugar = 0.123 × 90

0.123 mole of sugar = 11.07 cents

From Avogadro's hypothesis,

1 mole of sugar = 6.02×10²³ particles

Therefore,

0.123 mole of sugar = 0.123 × 6.02×10²³

0.123 mole of sugar = 0.74×10²³ particles

Concentration = mole / Volume

Concentration of sugar = 0.123 / 0.342

Concentration of sugar = 0.36 mol/L

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Answer:

option b is the answer of given statementtwo atoms of potassium react with one molecule of chlorine to produce two molecules of potassium chloride

The pH of a buffer solution with acid that (PKA 6. 1) is exactly half as concentrated as its conjugate base is 6.4.

A buffer solution is a solution that has a maintained pH, not basic or not acidic. Its pH changes when acid or base is added to the solution.

We had to figure out the acid's concentration, which is exactly half that of its potential base.

We know that pH = pH_log

We have less than 6.1 pH so this is a conjugated base.

This will equal to 6.1 + log2 = 6.4

Thus, the pH of a buffer solution with acid is 6.4.

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Mass of aluminum = (1.50 m^3)( 2.70 x 10^3 kg/m^3) = 4050 kg 

The intention of density is the assembly per volume of the substance. This is an intrinsic property consequently the size (or any external feature) does not change this effects.

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Answer: D

Explanation: 4.05 x 10^3 kg

At equilibrium the concentrations of:

[HSO₄⁻] = 0.10 M;

[SO₄²⁻] = 0.037 M;

[H⁺] = 0.037 M;

There is initially very little H+ and no SO₄²⁻ in the solution. A salt is KHSO₄⁻. All KHSO₄⁻ will split apart into K⁺ and HSO₄⁻ ions. [HSO₄⁻] will initially be present at a concentration of 0.14 M.

HSO₄⁻ will not gain H⁺ to produce H₂SO₄ since H₂SO₄ is a strong acid.  HSO₄⁻ may act as an acid and lose H⁺ to form SO₄²⁻. Let the final H⁺ concentration be x M. Construct a RICE table for the dissociation of HSO₄²⁻.

R   [tex]HSO_4^-[/tex]    ⇄  [tex]H^+ + SO_4^2^-[/tex]

I    [tex]0.14[/tex]

C   [tex]- x[/tex]               [tex]+x[/tex]       [tex]+x[/tex]

E   [tex]0.14-x[/tex]        [tex]x[/tex]         [tex]x[/tex]

[tex]K_a = 1.3[/tex] × [tex]10^-^2[/tex] for [tex]HSO^-_4[/tex] . As a result,

[tex]\frac{[H^+]. [SO_4^2^-]}{HSO_4^-} = K_a[/tex]

[tex]K_a[/tex] is large. It is no longer valid to approximate that [tex][HSO^-_4][/tex] at equilibrium is the same as its initial value.

[tex]\frac{x^2}{0.14-y} = 1.3 * 10^-^2[/tex]

[tex]x^2+1.3*10^-^2x - 0.14[/tex] × [tex]1.3[/tex] × [tex]10^-^2= 0[/tex]

Solving the quadratic equation for [tex]x , x \geq 0[/tex] since [tex]x[/tex] represents a concentration;

                             [tex]x=0.0366538[/tex]

Then, round the results to 2 significant figure;

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1.4406 × 10⁻⁶ is the Ka(dissociation constant) for the acid.

The equilibrium constant for the reaction of an acid with water is the acid dissociation constant, where the acid, HA separates into H⁺ and A⁻ ions.

The acid dissociation constant is represented by (Ka).

So let's first imagine that the given monoprotic acid is HA.

HA will dissociate into H⁺ and A⁻ ions.

HA ⇒ H⁺ and A⁻

The formula used for Ka is

Ka = [H⁺] [A⁻] / [HA]

Given

pH = 2.83

[HA] = 1.50 M

From the given pH, we can calculate [H⁺] and [A⁻]

[H⁺] = [A⁻] = 1 × [tex]10^{-2.83}[/tex] =  1.47 × 10⁻³ M

Ka = 1.47 × 10⁻³ × 1.47 × 10⁻³ / 1.50

Ka = 1.4406 × 10⁻⁶

Hence, 1.4406 × 10⁻⁶ is the Ka for the acid.

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Answer: 5kg

Explanation: formula K=1/2mv^2

50=10m

Answer:

C

Explanation:

KE = 1/2 m v^2

KE *2 / v^2   = m

50 (2)/ 10^2   = m =  1 kg

27.94 g/mole is the molar mass of the unknown gas.

Use Graham's Law, which indicates that the square root of a gas's molar mass determines its rate of effusion.

The following equation compares two distinct gases, (a) and (b), and expresses this:

sqrt(M(b)/M) = R(a)/R(b) (a)

R is the effusion rate.

square root = sqrt

the molar mass, M

In response to your query, if gas (a) is the unknown gas and Xe(M = 131 g/mol) is the second gas, we have:

sqrt(M(Xe)/M(a) = 2.165, where R(a)/R(Xe)

Square both sides, and you get:

(2.165)² = 131 g/mol/ M (a)

M(a)(2.165)² = 131

M(a) is equal to 131/(2.165)² = 27.94 g/mol.

Having a molar mass of 27.94 g/mol, the unknown gas.

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25.898 g is the amount of magnesium nitride and magnesium oxide formed.

Step1 2Mg(s)+ O2(g)-----> 2 MgO(s)

3Mg(s)+N2(g)------> Mg3N2(s)

Mg3N2(s)+ 6 H2O(l)---> 3Mg(OH)2 + 2 NH3(g)

Step2 Moles of NH3 = (2.813/17)

Moles of Mg3N2= (1/2) Moles of NH3 = (2.813/2x17)= 2.813/34

Mass of Mg3N2 = (2.813/34) x100 =8.274g (Molar mass of Mg3N2=100)

Step3 Mass of Mg in Mg3N2 =(72/100) x8.274 =5.957g

Mass of Mg converted in MgO= 21.496-5.957=15.539

Moles of MgO= Moles of Mg = 15.539/24

Mass of MgO = 15.539x40/24 =25.898 g.

Magnesium is a cofactor for over 300 enzymatic systems that regulate various biochemical reactions in the body, including protein synthesis, muscle and nerve function, glycemic control, and blood pressure regulation [1-3].

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The incorrect statement is e = 0 for a spontaneous reaction.

The cell potential is 0 at equilibrium.

For a spontaneous reaction the value cell potential E cell is positive i.e. >0

This statement is incorrect because the potential of a cell is positive if the reaction is spontaneous. Hence it cannot be zero.

For a spontaneous reaction gibbs free energy δ g value is negative i.e. < 0

At equilibrium the value of gibbs free energy is zero i.e. δg = 0

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Answer:

.75 J / g-°C

Explanation:

Specific heat =   J / gm-C

                   = 7500 J /( 2000 gm * 5 c) =   .75 J / g-°C

The type of bond will typically form between boron and hydrogen based  is boron-hydrogen-boron bridge bond also known as 3 centered two electron bond on the basis of their electronegativity.

Electronegativity is a tendency or chances of an element to accepts the single electron from any atom not only the lone pair of electrons.

Fluorine is smallest and the highly  electronegative element of the periodic table after that oxygen is also an electronegative element after that nitrogen.

Therefore, it is  known as 3 centered two electron bond on the basis of their electronegativity.

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Titration is the determination of quantity by a known amount. The pH of the solution after the solution was added with 650 mL of hydrochloric acid is 13.4.

pH is the calculation of the hydrogen ion concentration in the solution and can be used to determine the acidity or the basicity of the solution.

Given,

M₁ = 0.40 M

V₁ = 550 mL

M₂ = 0.25 M

V₂ =?

Volume at 0.25 M is calculated as,

M₁V₁ = M₂V₂

0.40 × 550.0 =0.25 × V2

V2 = 880 ml

880 mL of HCl is required for the neutralization reaction.

The final molar concentration of NaOH is,

550 × M₁ = 0.25 × 650

M₁ = 0.295 M

pH is calculated as:

pOH = -log [OH⁻]

= -log [0.295]

= 0.529

Solving further,

pH+ pOH = 14

pH = 14 - pOH

= 14 - 0.529

= 13.4

Therefore, 13.4 is the pH of the solution.

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The theoretical yield isopentyl acetate is of the 1.82 g

Now the theoretical yield is the yield of the product as obtained from the stoichiometry of the reaction. In this case, we know the reaction is 1:1.

Mass of  isopentyl alcohol = 0.810 g/mL * 1.5 mL = 1.215 g

Mass of acetic acid = 1.05 g/mL * 2 mL = 2.1 g

Number of moles of  isopentyl alcohol = 1.215 g/88 g/mol = 0.014 moles

Number of moles of acetic acid = 2.1 g /60 g/mol = 0.035 moles

Hence   isopentyl alcohol is the limiting reactant.

1 mole of   isopentyl alcohol yields 1 mole of isopentyl acetate

0.014 moles   isopentyl alcohol yields 0.014 moles of isopentyl acetate

Mass of of isopentyl acetate = 0.014 moles * 130 g/mol = 1.82 g

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Ethanoyl chloride is a common acyl chloride. Any other acyl chloride will function similarly.  Similarly, ethanol is regarded as a typical alcoholic beverage. simply substitute the CH3CH2 group with an alkyl group.

The first stage of the reaction (the addition stage) includes a nucleophilic attack on the relatively positive carbon atom by one of the lone pairs on an ethanol molecule's oxygen.

The second stage (elimination) occurs in two stages. The carbon-oxygen double bond reforms in the first step, releasing a chloride ion.

The ethanoyl chloride then removes a hydrogen ion, yielding ethyl ethanoate and hydrogen chloride.

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Answer:

20.4 grams Zn

Explanation:

To find the mass, you first need to find the moles. This can be found using the Ideal Gas Law equation:

PV = nRT

In this equation,

-----> P = pressure (atm)

-----> V = volume (L)

-----> n = moles

-----> R = Ideal Gas Constant (0.08206 atm*L/mol*K)

-----> T = temperature (K)

Before you can plug the values into the equation, you need to convert Celsius to Kelvin.

P = 0.980 atm                   R = 0.08206 atm*L/mol*K

V = 7.80 L                          T = 25.0 °C + 273.15 = 298.15 K

n = ? moles

PV = nRT

(0.980 atm)(7.80 L) = n(0.08206 atm*L/mol*K)(298.15 K)

7.644 = n(24.466)

0.312 moles = n

Now that you have the number of moles, you can convert it to grams using the atomic mass of zinc. The final answer should have 3 sig figs to match the sig figs in the given values.

Atomic Mass (Zn): 65.380 g/mol

0.312 moles Zn           65.380 grams
-------------------------  x  -------------------------  =  20.4 grams Zn
                                         1 mole

We have five significant figures in the value 25 , 803 , 000 , 000 mg.

The term significant figures refers to the numbers of figures to which we can assign a mathematical values. The numbers that we refer to here must be non zero numbers.

The implies that we must look out for the values that are nonzero in the digits shown which is 25 , 803 , 000 , 000 mg. A close look at this values shows us that we have five figures that can be assigned values.

Thus we have five significant figures in the value 25 , 803 , 000 , 000 mg.

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Answer:

7.44 grams CaCl2 will produce 10.0 grams KCl.

Explanation:

The equation is balanced:

I've repeated it here, with the elements corrected for their initial capital letter.

CaCl2( aq) K2CO3( aq) → 2KCl( aq) CaCO3( aq)

This equation tells us that 1 mole of CaCl2 will produce 2 moles of KCl.

If we want 10.0g of KCl, we need to convert that mass into moles KCl by dividing by the molar mass of KCl, which is 74.55 grams/mole.

 (10.0 grams KCl)/(74.55 grams/mole) = 0.1341 moles of KCl.

We know that we'll need half that amount of moles CaCl2, since the balanced equation says we'll get twice the moles KCl for every one mole CaCl2.

So we'll need (0.1341 moles KCl)*(1 mole CaCl2/2moles KCl) = 0.0671 moles CaCl2.

The molar mass of CaCl2 is 110.98 grams/mole.

(0.0671 moles CaCl2)*(110.98 grams/mole) = 7.44 grams CaCl2

7.44 grams CaCl2 will produce 10.0 grams KCl.

Hydroplaning occurs when water between the tires and the road builds until the tires begin to ride on a film of water, resulting in traction loss.

The motor vehicles or aircraft tires passing over wet pavement may lose contact with sufficient speed or water depth for a particular given tread design. The tires lose the braking friction required for stopping and start to hydroplane or aquaplane when they come into contact with water. Wet road surfaces can cause tires to hydroplane . This could result in loss of control and steering ability.

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Answer:

Explanation:

Hope It Helps!!!!

Answer:

See belwo

Explanation:

First it becomes a compressed gas.... further pressure will cause it to condense into a liquid.

The compound  2-bromopentane contains a chiral carbon atom.

So , option D is correct one.

The carbon which is bonded with four different substituent or four valency of carbon is satisfy by the four different substituent is called chiral carbon and the molecule contain such chiral carbon is called chiral molecule. The molecule contain chiral carbon rotates plane polarized light.

Example: The compound  2-bromopentane contains chiral carbon at second carbon and four different substituent at second carbon is methyl , bromine , propyl and hydrogen.

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Answer:

from 10-14

Explanation:

the pH of potassium hydroxide is extremely high and is a strong base although the exact value depends on the concentration of the base in water.