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Answer:

5.0 x 10^-7

Explanation:

[H+]=10^-6.3

51.8 g NaCl

Explanation:

2Na(s) + Cl2(g) ---> 2NaCl(s)

20.4 g Na × (1 mol Na/22.9898 g Na) = 0.887 mol Na

0.887 mol Na × (2 mol NaCl/2 mol Na) = 0.887 mol NaCl

0.887 mol NaCl × (58.44 g NaCl/1 mol NaCl) = 51.8 g NaCl

The net charge on the Peptide sequence: DSVK at pH = 0 is : a. net charge = +2.

The process of identifying the amino acids that make up a peptide chain's structural sequence is known as peptide sequencing. This knowledge must be made public in order to understand the structure and function of a protein within a cell, which is useful for biomedical research applications.

By convention, the names of peptides are always written from left to right, beginning with the N-terminal end. For example, the name glycyl-histidine-phenylalanine refers to a peptide that comprises glycine at the N-terminus, followed by a histidine, and then phenylalanine at the C-terminus.

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Answer:

1..) The property by the virtue of which the metals can be beaten into sheets.

Malleability.

2.

I.Reaction of iron with copper sulphate solution

ii.

Iron metal displaces copper from its compound copper sulphate and forms iron sulphate along with copper metal. This reaction is a displacement reaction.

Reaction:

Fe(Iron)+CuSO4(Copper Sulphate)-------FeSO4(Ferrous Sulphate)+Cu(Copper)

Answer:

0.167 M NaOH

Explanation:

Answer:

0.167

Explanation:

In the given bend on the topographic map, 1. is Downstream and 2. is Upstream.

The stream can be described as the moving water in a river is called a stream. Upstream can be described as if the water is flowing in the opposite direction to the stream, it is known as upstream.

Downstream can be described as flowing along the direction of the stream, it is known as downstream.

Still water can be described as under this circumstance the water is stationary and the speed of the water is equal to zero.

All rivers flow downhill from higher elevations to lower elevations and perpendicular to the contour line. As a rule of thumb, the V-shaped contour is representing upstream.

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Li2O > K2O > Rb2S is the order of given compounds lattice energy in the increasing order

Lattice energy is a measure of the strength of the electrostatic attraction between the positively charged cations and negatively charged anions in an ionic compound. The greater the lattice energy, the stronger the electrostatic attraction and the more stable the compound.The most common method for determining lattice energy is the Born-Haber cycle. This method uses thermochemical data of the individual steps in the formation of an ionic compound to calculate the lattice energy. However, it is often impractical to use this method in a test environment, so a more practical method that is used to compare lattice energies of different compounds is the use of the Coulomb's law which relates the lattice energy to the charge product of the cations and anions and the distance between them.

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Answer: 3

Explanation:

The total reduction potential of a cell in which sodium (Na) is reduced and zinc (Zn) is oxidized -1.95 V.

The tendency of a chemical species is to be reduced, expressed in volts under normal conditions, is known as the standard reduction potential.

The standard reduction potential belongs to the group of potentials known as standard electrodes or standard cells. The difference in voltage between the cathode and anode is known as the standard cell potential. The standard sodium reduction potential is -2.71V. Zinc has an average reduction potential of -0.76 V. Therefore, the overall reduction potential is 1.95 V.

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108gm of hydrogen gas is present in2600ml container at 35-degree Celsius and at pressure of 165mm Hg.

Given data:

water = 2600ml

temp = 35°C & 95k

pressure = 165mm Hg & 0.162atm

From given information we apply ideal das equation to get moles.

PV = nRT

0.162atm * 2600ml = n 0.0821 * 95k

n = 54

Now we know 1 mole of hydrogen contain 2.016gm hydrogen.

In 54 moles we have 108gm hydrogen.

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When we work with a chemical that emits hazardous vapors or fumes, the  best way to protect ourself is by using the fumes hood when working with chemicals.

The best way to protect ourself from the chemical fumes or vapor is the work with chemicals in the fumes hood. the fume hood is the ventilation device that limits the exposure of the hazardous fumes or the vapors.

There are several other ways to protect ourself from the chemical fumes are :

These are the some methods use to protect ourself from the chemical fumes or vapors.

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Answer:

Yellow

Explanation:

The color of the equilibrium mixture of Iodine Monochloride and Chlorine is yellow. When the mixture is heated, it becomes darker brown in color.

Answer: In the sweat and urine

Explanation:

Sodium is part of body's mineral. It will easily go out or lose when we we sweat and when we urinate. They lost from the body in form of water contained sodium.

The amount of work required to increase the separation of the two ions to an infinite distance is 3.68×10⁻¹⁸joules.

When a push or pull applied to an object causes the object to move, that movement is referred to as work. We refer to energy as the ability to perform the work. The work completed in a given amount of time is referred to as power.

Mg²⁺with a charge is 3.2×10⁻¹⁹C

O²⁻with a charge of −3.2×10⁻¹⁹C

distance = 0.25 = 0.25 ×10⁻⁹m

We know that the constant of proportionality is equal to 8.99×10⁹Jm/C²

Work = -kq₁q₂/d

Substitute given values into the formula,

Work = 8.99×10⁹× 3.2×10⁻¹⁹× -3.2×10⁻¹⁹/ 0.25 ×10⁻⁹

Work =  8.99×10⁹×-1.024×10⁻³⁷/0.25×10⁻⁹

Work = 9.21×10⁻²⁸/ 0.25×10⁻⁹

Work = 3.68×10⁻¹⁸Joules.

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Answer:

B. Propane

Explanation:

just did it edge 2022

well excuse the "s" at the end

Answer: devide the concept

Explanation: devide and then answer it

The value of the ΔH for the reaction is obtained as 1278 kJ .

We have to note that the enthalpy change of the reaction has to do with the heat that ahs been evolved or absorbed in a reaction. In this case we have to obtain the enthalpy change by looking at the combustion reaction that has been shown here.

It is clear that from the thermochemical reaction equation, there is the evolution of about 1278 kJ of heat in the process of the reaction as shown in the question that we have above.

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Grams have been employed to estimate the mass of decomposition. Option C is correct, so.

The chemical response is as follows:

Every mole of must be broken to generate one mole of KCl.

180 kilograms of KCl was produced.

KCl produced in moles =

Produced moles of KCl equals moles.

Degradation of the same material is necessary for the creation of moles of KCl.

Therefore, the moles of the must be decomposed = moles.

Decomposition of mass equals moles of molecular weight

122.2 grammes of moles must be degraded from the mass.

Has to be decomposed for the production of 2 moles of KCl =

kilos.

Thus, kilograms has supplied the mass of decomposition. Option C is correct, however.

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Using the Ideal Gas Law equation: [tex]PV=nRT[/tex]

STP also known as Standard Temperature  and Pressure is a set of conditions at sea level

At STP:

P = 101.3 kPa

T = [tex]0^o C[/tex] or 273 K

[tex]n=\frac{PV}{RT}[/tex]

[tex]n=\frac{101.3kPa)(3.7L)}{(8.31\frac{kPaL}{molK})(273K)}[/tex]

[tex]n = 0.16 mol[/tex]

A quality of matter that is unrelated to a change in its chemical makeup is called a physical property. Density, color, hardness, melting and boiling points, and electrical conductivity.

A quality of matter that is unrelated to a change in its chemical makeup is called a physical property. Density, color, hardness, melting and boiling points and electrical conductivity are a few common examples of physical qualities.

A substance with a given mass and a certain volume in space is referred to as matter. Examples of matters are pens, pencils, toothbrushes, water, and milk, as well as vehicles like cars, buses, and bicycles. Therefore, the matter is divided into two categories: living and non-living.

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Physical properties are characteristics of matter that are independent of changes in its chemical composition. Electrical conductivity, hardness, melt and boiling points, and density.

Physical properties are characteristics of matter that are independent of changes in its chemical composition. Physical characteristics include things like density, color, durability, melting , boiling temperatures, and electrical conductivity, to name a few.

Matter is defined as a material having a certain mass and spatial volume. Pencils, pencils, toothbrushes, water, milk, as well as automobiles, buses, and bicycles, are examples of matters. 

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Based on the information, UV light is more likely to damage the material.

Due to the fact that the infrared light bounces off the quartz, which increases its energy, the quartz may become warm.

The colors of paper and fabric can deteriorate due to ultraviolet light from the sun. In the presence of ultraviolet light waves, the chemicals in colored dyes can degrade. Sunburns may also result from ultraviolet radiation.

Paper and other organic materials will deteriorate, bleach, and deteriorate due to ultraviolet radiation. All of these modifications may reduce readability, affect how well artwork is regarded for its aesthetic qualities, and restrict access to the information it contains.

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Answer:

293 oC

Explanation:

Ca3(PO4)2 has a molar mass of 310.18 g/mol.

The sum of the molar masses of a compound's component parts determines its molar mass. The molar masses of calcium, phosphorus, and oxygen must be added up in order to determine the molar mass of Ca3(PO4)2.

The molar mass of calcium is 40.08 g/mol.

The molar mass of phosphorus is 30.97 g/mol.

The molar mass of oxygen is 16.00 g/mol.

There are 3 moles of calcium, 2 moles of phosphorus, and 8 moles of oxygen in the compound Ca3(PO4)2.

As a result, the formula for calculating the compound's molar mass is: 340.08 + 230.97 + 8*16 = 120.24 + 61.94 + 128 = 310.18 g/mol

Consequently, Ca3(PO4)2 has a molar mass of 310.18 g/mol.

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Answer:

strong acids fully ionise to produce H+ ions.

weak acid PARTIALLY ionise

strong Base fully ionise to produce OH- ions

weak base partially ionise

thus ans is C

Answer:

[tex]\boxed {\boxed {\sf 142.2 \ K}}[/tex]

Explanation:

This problem asks us to find the temperature change necessary to make the volume change. We use Charles's Law which states that temperature is directly proportional to the volume of a gas. The formula is:

[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]

We know the balloon originally had a volume of 6.5 liters and a temperature of 280 Kelvin. Then, the temperature was cooled so the new volume is 3.3 liters. However, the exact new temperature is unknown.

Substitute all known values into the formula.

[tex]\frac {6.5 \ L}{280 \ K}=\frac{3.3 \ L}{T_2}[/tex]

Now, solve the new temperature (T₂). First, cross multiply. Multiply the 1st numerator by the 2nd denominator. Then, multiply the 1st denominator by the 2nd numerator.

[tex]280 \ K * 3.3 \ L = 6.5 \ L * T_2[/tex]

Multiply the left side.

[tex]924 \ K *L=6.5 \ L *T_2[/tex]

We must isolate the variable. Currently, it is being multiplied by 6.5 liters. The inverse of multiplication is division. Divide both sides by 6.5 L.

[tex]\frac { 924 \ K*L}{6.5 \ L}= \frac{ 6.5 \ L *T_2}{ 6.5 \ L}[/tex]

[tex]\frac { 924 \ K*L}{6.5 \ L}= T_2[/tex]

The units of liters (L) cancel.

[tex]\frac { 924 \ K}{6.5 }= T_2[/tex]

[tex]142.153846 \ K= T_2[/tex]

Let's round to the nearest tenth place. The 5 in the hundredth place tells us to round the 1 up to a 2.

[tex]142.2 \ K= T_2[/tex]

The temperature must be cooled to approximately 142.2 Kelvin.

Answer: Correct option is B . calcium and iron  decrease the absorption of lead in the body.

Explanation: calcium and iron  decrease the absorption of lead in the body without affecting its solubility,probably by competing for shared absorptive receptors in the intestinal mucosa. The total body burden of lead does not affect lead absorption. Thus, lead does not have a feedback mechanism which limits absorption.