Histidine, an essential amino acid, has as a positively charged imidazole functional group. The imidazole makes it a common participant in enzyme catalyzed reactions. The unprotonated imidazole is nucleophilic and can serve as a general base, while the protonated form can serve as a general acid.
How is hotter air different than colder air?
A. Hotter air consists of different molecules than colder air.
B. In hotter air, the molecules are closer together and moving more slowly.
C. In hotter air, the molecules are farther apart and moving more rapidly.
D. Hot air is denser than colder air.
Answer:
C.
Explanation:
The molecules in hot air are moving faster than the molecules in cold air. Because of this, the molecules in hot air tend to be further apart on average, giving hot air a lower density. That means, for the same volume of air, hot air has fewer molecules and so it weighs less.
How is hotter air different than colder air?
Options:- A. Hotter air consists of different molecules than colder air.B. In hotter air, the molecules are closer together and moving more slowly.C. In hotter air, the molecules are farther apart and moving more rapidly.D. Hot air is denser than colder air.Answer:-Option C :- In hotter air, the molecules are farther apart and moving more rapidly.
Explanation :- When temperature rises Kinetic energy of the gases increase when helps them to overcome there interatomic molecules so they move further away from each other Due to increase in Kinetic energy there Velocity ( net ) also increase which helps them to move fast As the particles moves far away there density also decrease as less mass of the gas is present in same volume or we can say same mass as larger volume then the colder one With change in temperature only there energies got changed so we can say hotter and colder air has same molecules is same gas heated or chilledCalculate the percentage of sulphur in MgSO4.2H₂O
Answer:
[tex]Molecular \: mass \: of \: MgSO_{4}.2H_{2}O\:, \\ \\ ⇝ 24 + 32 + 16 \times 4 + 2(2 \times 1 + 46) \\ \\ ⇝ 24 + 32 + 64 + 36 \\ \\ ⇝156 \: u[/tex]
[tex]\bold\pink{Percentage \: of \: substance \: in \: compound} \\ \\ \bold\pink{⇝ \frac{mass \: of \: substance}{mass \: of \: compound} \times 100}[/tex]
[tex]\% \: age \: of \: Sulphur \: (S) = \frac{32}{156} \times 100 \\ \\ ⇝0.205 \times 100 \\ \\ \fbox\blue{\:⇝ 20.5\%\:}[/tex]
hope helpful ~
Answer:
20.51%
Explanation:
Mass of S = 32g
Mass of MgSO₄ x 2H₂O = 24 + 32 + 64 + 36 = 56 + 100 = 156
%S = 32/156%S = 8/39%S = 20.51%Helpp me please it’s hard
Answer:
I say A not only because it's a repeat of B but because it also doesn't talk about in which direction the velocity is.
Explanation:
Hope this helped.
A brainliest is always appreciated.
Astronomers made two observations of the Moon that were several days apart. Their observations are shown in the diagram above. The light part of the Moon appeared to get larger over time. Why did this happen?
Answer:
Explanation:
As the earth revolves around the sun, and the moon revolves around the earth, the intensity of sunlight hitting the moon changes over time. This explains why we get the phases of the moon. The answer as to why, is because the moon was moving towards a state of being a "full moon."
Density of iron is 7.8 g/cc. How much would 10 cc of iron weigh?
Answer:
The answer is 78 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume = 10 cc
density = 7.8 g/cc
So we have
mass = 7.8 × 10
We have the final answer as
78 gHope this helps you
Please help! Each color of.light has a specific amount of energy. A
hydrogen atom will absorb and emit red, blue-green, blue, and violet light but not
yellow or orange light. Explain this phenomenon
Answer:
only certain wavelengths of the light can be absorbed.
There are no transitions in the hydrogen atom that corresponds to the wavelength of yellow or orange light.
Each color corresponds to a particular wavelength. The wavelengths that are observed for a given atom depends on the transitions that are possible for electrons of the atom.
In the hydrogen atom, there is no transition whose wavelength corresponds to the wavelength of yellow or orange light. None of the lines in the hydrogen spectrum has such wavelength.
For instance, yellow light corresponds to 590 nm - 560 nm but this wavelength is missing from the spectrum of hydrogen(crosscheck in the image attached).
As such, we do not see yellow or orange lights in the hydrogen spectrum.
Learn more: https://brainly.com/question/6255073
In the polar molecule HBr, what charge does the H bear
Considering the definition of polar molecule, Br has a negative partial charge and H a positive partial charge.
The bond dipole moment can then be defined as the magnitude of the polarity in a bond. This moment represents the distribution of electron density in a bond.
The distribution of charges is due to the fact that the atoms that form them have different electronegativity, in such a way that when a covalent bond is created and the electrons are shared, the electrons of the bond are attracted with different force by the atoms that share them.
Then, a polar molecule is one that is neutral, that is, it does not have a net charge. But it has an internal distribution of charges that form a partially positive region and a partially negative region.
That is, polar bonds are established between atoms of different electronegativity, so that the atom with higher electronegativity will attract the electrons towards itself, giving rise to two opposite charges in the bond and creating a negative charge on the atom because the electrons have negative charge.
In this way, in a polar molecule there is separation between positive and negative charges. The bonds will be the more polar the greater the electronegativity difference between the bonded atoms.
In this case, bromine Br has a higher electronegativity and attracts electrons shared with hydrogen H more strongly. Then Br has a negative partial charge and H a positive partial charge.
Learn more:
https://brainly.com/question/15326940?referrer=searchResultsWhat is a phase diagram?
If a system absorbs 155.0 kJ of heat from its surroundings and the
system does 45.0 kJ of work on its surroundings, what is the change
in the internal energy of the system, in kJ?
The change in internal energy of the system is 110 kJ.
What is a change in internal energy?Change in internal energy is the difference between the energy absorbed by the system and the work done by the system.
To calculate the change in the internal energy of the system, we use the formula below.
Formula:
ΔU = Q-W............... Equation 1Where:
ΔU = Change in internal energy of the systemQ = Heat absorbs by the systemW = Work done by the system.From the question,
Given:
Q = 155.0 kJW = 45.0 kJSubstitute these values into equation 1
ΔU = 155-45ΔU = 110 kJ.Hence, The change in internal energy of the system is 110 kJ.
Learn more about change in internal energy here: https://brainly.com/question/17136958
1.How is sunlight different from light produced by a light blub or by a fluorescent light blub?
2.What are some examples of light sources that you have seen where the light emitted was a color other than white?
3.What are some examples you have seen where white light was split into different colors?
Answer:
lemme slurp them juices out of that p*ssy. You must taste sweet.
Explanation:
what is a compound? Claim
Answer: A compound is a material formed by chemically bonding two or more chemical elements. The type of bond keeping elements in a compound together may vary: covalent bonds and ionic bonds are two common types. The elements are always present in fixed ratios in any compound.
Explanation:
A sample of sodium chloride was found to contain 60.66 g of sodium and 39.34 g of chloride. How many
grams of each element would be expected in a 200.0 g sample of sodium chloride?
Answer:
78.68g Na
121.32 Cl
Explanation:
This one is more easy than the wording makes it seem. Since there are 60.66g of sodium (Na) and 39.34g of Chlorine (Cl) it adds up to 100g, so in this case you can just double each amount, and get what each would be in a 200g sample.
Short Essay: What does the daily number of the rona virus information tells if about Louisiana’s population?
Answer:
32
Explanation:
Which compound has the highest melting point?
Al2(CO3)3
C12H22O11
C8H18
H2O
Answer:
Al2(CO3)3 (A)
Explanation:
i think thats the answer
Aluminum carbonate is indeed a carbonate solution of aluminum that is intended for oral intake. It should be the carbonate salt type of aluminum that's also intended for oral consumption.
It is used to alleviate the symptoms of excess stomach acid in situations like heartburn, acid reflux, acid indigestion, upset stomach, or stomach ulcers.It is a water-insoluble Aluminum source that, when heated, rapidly converts to other Aluminum complexes like oxide.Therefore, the answer is "[tex]\bold{Al_2(CO_3)_3}[/tex] ".
Learn more:
brainly.com/question/12232746
As the kinetic energy of particles of matter increases the distance between the particles what
Answer:
causing the particles to move faster and farther apart.
Explanation:
hope this helps
As the kinetic energy possessed by the particles of matter increases and so does the distance, hence particles tend to move faster.
What is kinetic energy?Kinetic energy is "a form of energy that an object or a particle has by reason of its motion".
What is particles?Particle is "a small portion of matter".
What is matter?
Matter is "anything that occupies space and has mass".
What is distance?
Distance of "an object can be defined as the complete path travelled by an object".
Hence, the kinetic energy of particles of matter increases with the increase in the distance between the particles.
To learn more about Kinetic energy here
https://brainly.com/question/18592807
#SPJ2
1. Intrusive igneous rocks form from
A. magma that cools underground
B. lava that cools on Earth's surface
C. sediment that undergoes heat and pressure
PLS HELP
Answer:
a
Explanation:
Answer:
a
Explanation:
These rocks form underground by magma as it cools down.
HOPE IT HELPED
The three states of matter differ primarily in terms of shape and volume. Describe solids, liquids and gases in these terms.
Answer:
solids have definite shape and volume. liquid have definite volume but not definite shape. gases do not have definite volume as well as definite shape.
WHAT IS A GLIZZY MADE OF DOUN TO THE DETAIL PLS
what is the biggest planet on earth im giving branlest to the firsh 1 who answers and 100 coins
Answer:
Jupiter
Biggest Planets In Our Solar System
Explanation:
hopes this help
Answer:
Explanation:
If the question is truly the biggest planet on earth, then the answer is earth.
But if the question is the biggest planet in the solar system, then it is Jupiter.
What kind of soild often has the highest melting points?
Answer: Diamond is covalent crystal. It has the highest melting point because high energy covalent bonds hold the crystal together.
Explanation: Covalent bonds are very strong, so covalent network solids typically have the highest melting points out of all four types of solids.
Answer:
giant covalent solids
Ionic solids also have high melting points, often over 1000 degrees but they can vary. Some are often low enough to melt in the lab with a Bunsen burner:
Explain how the earliest philosophers arrived at the conclusion that "this primary entity
(arche) always persists".
They believing that all things consists of that from which they were originally generated is how they arrived at such conclusion.
What is Arche?This is a Greek word which refers to the origins and beginnings of n object or organism.
The earliest philosophers arrived at the conclusion that "this primary entity(arche) always persists as a result of all things comprising of that which they were originally generated .
Read more about Arche here https://brainly.com/question/1658810
NEED ANSWER ASAP
What is the phase change that happens with a gas goes straight to a solid (skip the liquid stage)? Frost would be a good example in everyday life.
At a maximum, an f-orbital can hold_____ electrons, a d-orbital can hold_____ electrons, a p-orbital can hold ________ electrons and an s-orbital can hold ________ electrons.
How do I find the moles of OH- which reacted (mol) in the titration. Table Attached
Answer:
It is equal to the number of moles of acid that reacted. When Oxalic acid is your limiting reactant it is the # of moles of oxalic acid used. When NaOH is your limiting reactant it is equal to the number of moles of NaOH used.
The moles of OH⁻ that reacted in the titration can be found by;
Determining the number of moles of oxalic acid used in the titrationThe moles of OH⁻ used in the titration experiment is dependent on the number of moles of the limiting reactant, used during the Titration in the laboratory.
From the data contained in the table, the limiting reactant is the oxalic acid. therefore the number of moles of OH⁻ is equal to the number of moles of oxalic acid used during titration.
Hence we can conclude that the moles of OH⁻ that reacted in the titration can be found by determining the number of moles of oxalic acid used in the titration
Learn more : https://brainly.com/question/12056938
Kc for the reaction of hydrogen and iodine to produce hydrogen iodide.
H2(g) + I2(g) ⇌ 2HI(g)
is 54.3 at 430°C. Calculate the equilibrium concentrations of H2, I2, and HI at 430°C if the initial concentrations are [H2] = [I2] = 0 M, and [HI] = 0.391 M.
Answer:
[tex][H_2]_{eq}=0.183M[/tex]
[tex][I_2]_{eq}=0.183M[/tex]
[tex][HI]_{eq}=0.025M[/tex]
Explanation:
Hello.
In this case, for this equilibrium problem, we first realize that at the beginning there is just HI, it means that the reaction should be rewritten as follows:
[tex]2HI\rightleftharpoons H_2+I_2[/tex]
Whereas the law of mass action (equilibrium expression) is:
[tex]Kc=\frac{[H_2][I_2]}{[HI]^2}[/tex]
That in terms of initial concentrations and reaction extent or change [tex]x[/tex] turns out:
[tex]Kc=\frac{x*x}{([HI]_0-2x)^2}\\\\54.3=\frac{x^2}{(0.391M-2x)^2}[/tex]
And the solution via solver or quadratic equation is:
[tex]x_1=0.183M\\\\x_2=0.210M[/tex]
Whereas the correct answer is 0.183 M since the other value yield a negative concentration of HI at equilibrium (0.391-2*0.210=-0.029M).This, the equilibrium concentrations are:
[tex][H_2]_{eq}=0.183M[/tex]
[tex][I_2]_{eq}=0.183M[/tex]
[tex][HI]_{eq}=0.391M-2*0.183M=0.025M[/tex]
Regards.
PLEASE HELP ASAP!!!!! What word is the best description for world population growth over the past 200 years?
Question 1 options:
Experimental
Arithmetic
Logarithmic
Exponential
Answer:
Exponential
Explanation:
Because its the numbers/anything that is becoming more and more rapid.
Convert the following number of moles of chemical into its corresponding mass in grams.
3. 0.031 moles of Li
I have a question i know this but what is an Idenpendent Variable and what is an Dependent Variable which one is the cause and effect
Answer:
The independent variable is the cause while the dependent variable is the effect.
Explanation:
What is the H30* concentration of 0.027 M Ca(OH)2?
Select one
O 3.9 x 10-13 M.
0 0.027 M
O 1.9 x 10-13 M
0 3.7 x 10-13 M
Answer:
1.9 x 10⁻¹³M
Explanation:
Given 0.027M Ca(OH)₂(aq) => 0.027M Ca⁺²(aq) + 2(0.027M) OH⁻(aq)
2(0.027M) OH⁻(aq) = 0.054M OH⁻(aq).
from [H⁺][OH⁻] = 1 x 10⁻¹⁴ at STP Conditions (0°C, 1Atm)
∴{H⁺] = [H₃O⁺] = (1 x 10⁻¹⁴/0.054)M = 1.85 x 10⁻¹³M or 1.9 x 10⁻¹³at 0°C & 1Atm pressure.
If a rock contains 75% lead 206 (Pb206) and 25% uranium 238 (U238), how old is the rock? Explain how you determined the answer. (2 points)
The age of the rock can be calculated from the half life of Uranium - 238. The age of the rock sample is 9 million years.
What is radioactivity?The term radioactivity refers to the sponteanous decay of a material which leads to the production of daughter nuclei. We know that uranium 238 decays to lead 206 with a half life of 4.5 billion years.
Using;
0.693/t1/2 = 2.303/t log(No/N)
t1/2 = half life of uranium 238
t = age of the rock sample
No = initial amount of uranium 238
N = amount of uranium 238 after time t
Now;
0.693/4.5 * 10^9 = 2.303/t log (No/0.25No)
0.693/4.5 * 10^9 = 2.303/t log(1/0.25)
0.693/4.5 * 10^9 =1.387/t
1.54 * 10^-10 = 1.387/t
t = 1.387/1.54 * 10^-10
t = 9 million years
The age of the rock sample is 9 million years.
Learn more about age of rock: https://brainly.com/question/276030