Answer:
Volume = 190.8
What is the net charge on the following peptide at pH = 0?
Peptide sequence: DSVK
a. net charge = +2
b. net charge = +1
c. net charge = 0
d. net charge = -2
The net charge on the Peptide sequence: DSVK at pH = 0 is : a. net charge = +2.
What is peptide sequence?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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A sample of 25L of NH3 gas at 10°C is heated at constant pressure until it fills a volume of 50L. What is the new temperature in °C?
Answer:
293 oC
Explanation:
What is a strong base
A balloon originally had a volume of 6.5 L at 280 K the volume must be cooled to ___K to reduce volume to 3.3
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.
SO NOT HALAL MODE :(
Answer:
umm
Explanation:
What is the hydrogen ion concentration of a strong acid which has a pH of 6.3
Answer:
5.0 x 10^-7
Explanation:
[H+]=10^-6.3
A magnesium ion, Mg2+, with a charge of 3. 2×10−19C and an oxide ion, O2−, with a charge of −3. 2×10−19C, are separated by a distance of 0. 25 nm. How much work would be required to increase the separation of the two ions to an infinite distance?
The amount of work required to increase the separation of the two ions to an infinite distance is 3.68×10⁻¹⁸joules.
What is work and energy ?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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What types of solutions are made when the temperature increases, then decrease?
a. saturated
b. supersaturated
c. unsaturated
A 750.0 mL solution contains 5.00 g of NaOH. If the molar mass of NaOH is 39.9969 g/mol, what is the molarity of the solution? (3 points)
25 M N OH
0.167 M N OH
5,98 M N OH
O 0,0891 M NaOH
help please
Answer:
0.167 M NaOH
Explanation:
Answer:
0.167
Explanation:
2. How many moles of helium are present in a balloon at STP if the volume is 3.7 L? Please show all work!
Using the Ideal Gas Law equation: [tex]PV=nRT[/tex]
P = pressure (kPa)V = volume (L)n = moles (mol)R = gas constant( [tex]\frac{kPaL}{molK}[/tex])T = Temperature (K)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]
Lead absorption is decreased by the presence of ______ in the body. a) calcium and vitamin D b) calcium and iron c) iron and selenium
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.
How many gram i hydrogen ga (H2) are in 2600 ml comtainer at 35 degree celiu and a preure of 165 mmHg
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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Baed on thi information, which type of light i more likely to damage the material?
Based on the information, UV light is more likely to damage the material.
Which kind of light has the greatest chance of warming quartz?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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Place the following in order of increasing magnitude of lattice energy:
K2O Rb2S Li2O
least lattice energy < --- --- ---> most lattice energy
I am really struggling with how to calculate lattice energy. So if you could, please explain how you got the answer and how that method could be generalized to other similar questions. I realize it has something to do with the charge product between the elements in the molecule, and secondary to that is the atomic radius... it's just not clicking for me to do on the fly.
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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Hello if anyone could help it would be great. Why is cooler material more dense than warmer material?
Describe the physical properties of matter using the graphic organizer below
indicate whether each property can be used to identify a substance, $6.6.864
Mass
Weights
Mass and Weight
Magnetism
Density
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.
What are the physical characteristics of matter and what do they mean?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.
What matters? Give five instances of matter.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.
What do matter's physical properties signify, and what are they?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.
Which matters? Give five examples of the subject.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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Calcium phosphate, Ca 3(PO 4) 2, is used to treat calcium deficiencies. What is the molar mass of this compound
Ca3(PO4)2 has a molar mass of 310.18 g/mol.
Molar mass: What is it?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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sodium is lost from the body in the ______.
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.
In an experiment, potassium chlorate decomposed according to the following chemical equation.
2 KClO3 → 2 KCl + 3 O2
If the mass of potassium chlorate was 240 grams, what is the mass of oxygen gas formed?
Answer Choices:
A)
94. 03g
B)
1378g
C)
41. 8g
D)
612. 5g
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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What is the total reduction potential of a cell in which sodium (Na) is reduced and zinc (Zn) is oxidized
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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Normal text Calibri
25) Look at the way the contour lines point or bend on the topographic map below. Match the blanks on
the map below using the terms "Upstream" or "Downstream" based on the direction the stream is
flowing.
Zo
1?
2.?
In the given bend on the topographic map, 1. is Downstream and 2. is Upstream.
What is Upstream and Downstream of the river?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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Table 4.4 : Metals and Non-metals in Acids and Bases
S.No. Name of the Base Metal Name of the Acid Non-metal
1. Calcium hydroxide Calcium Sulphuric acid Sulphur
2
3
4
5
Answer: devide the concept
Explanation: devide and then answer it
Help me please will give brainliest
well excuse the "s" at the end
When you work with a chemical that emits hazardous vapors or fumes, what is the best way to protect yourself
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 :
use the chemicals protective clotheswear the respiratory protectionuse the glovesalso wear the eye protectorThese are the some methods use to protect ourself from the chemical fumes or vapors.
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Iodine Monochloride reacts reversibly with Chlorine to form Iodine Trichloride, What will be the color of the equilibrium mixture
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.
No bots!!!!!! When 20.4 g of sodium metal are mixed with chlorine gas, how many g of NaCl are produced?
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
Give the ΔH value for the combustion of ethanol as shown in the reaction C2H5OH(g)+3O2(g)⟶Δ2CO2(g)+3H2O(g)+1278 kJ .
Express your answer using four significant figures. If the value is positive, do not include the + sign in your answer.
The value of the ΔH for the reaction is obtained as 1278 kJ .
What is the value of ΔH?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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What will a strong base mostly produce in water?
A. H+ ions
B. H3O+ ions
C. OH- ions
D. Cl- ions
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
which of the following is a combustion reaction ? ( please answer asap !! ) <3
Answer: 3
Explanation:
Name the following straight-chain
alkane.
CH3CH2CH2CH3
A. butane
B. ethane
C. propane
D. methane
Answer:
B. Propane
Explanation:
just did it edge 2022