Answer and Explanation:
In order for the spotting phase to be efficient and for the sample to register the repeated applications of the sample, it is necessary that in addition to the solubility and low toxicity, the solvent has a low boiling point, but that allows an efficient and rapid evaporation, whenever necessary, so that it is possible to release the sample on the TLC plate.
The solvent must be able to dissolve the compounds completely with minimal heating.
Even though the question is incomplete but I will try to help you as much as possible. Solvents are considered based .on their specific applications. Generally, a solvent should be non toxic and cheap.
Also, the solvent must be able to dissolve the compounds completely with minimal heating. This is important in deciding weather the solvent is suitable or not.
Learn more about solvents: https://brainly.com/question/4260635
I NEED HALPPPPPP PLEASE
Question 1 options:
instant tea
water
Question 2 options:
instant tea
water
Question 3 options:
mixture
solution
question 1 water question 2 instant tea question 3 mixture
Judy's brand new Lamborghini car travels 280 km in 4 hours. What is its average speed?
100
Continue reflecting on managing the effects of tropical cyclones by a
the phrases below:
I have learned that the Philippine Area of Responsibility
The Philippine Atmospheric, Geophysical, and Astronomical Services Administration
The Philippines is prone to typhoons because
You can trace the path of typhoons using
You will then understand that landmasses and bodies of
water affect the intensity of typhoons causing it to increase when
and decrease when
We should stay informed about the weather. Public Storm Warning Signals indicate
The higher the PSWS, the
the damage felt. Hazards that may
accompany tropical cyclones are
But tropical cyclones also have benefits, such as
Great work! Now that you know more about the effect of typhoons, you can
ssen the damages by knowing what to do. Answer the next activity, to eva
nowledge on precautionary measures to lessen the risk brought about by
10
Answer:
?????
Explanation:
...? what...?
dicotyledonous plants
The dicotyledons, also known as dicots, are one of the two groups into which all the flowering plants or angiosperms were formerly divided. The name refers to one of the typical characteristics of the group, namely that the seed has two embryonic leaves or cotyledons.
A chemical supply company sells sulfuric acid
(H2SO4) in a concentration of 4.00 M. What
volume of this solution would you need to make
12.0 mL of a 0.50 M H2SO4 solution?
Which equation should you use?
Answer:
A.
1.5
B
Explanation:
Which of the following would NOT be a suitable solvent for organolithium and organomagnesium reagents?
a. CH3OCH2CH2OCH3
b. CH3CH2OH
c. THF (tetrahydrofuran)
d. CH3CH2OCH2CH3
Answer:
b
Explanation:
it could also be a, c, or d
A student sets up a box with a flashlight that shines on a mirror located at position X. Other possible locations for objects in the box are labeled A-E.
How can the student place objects in the box to have all the light from the flashlight shine back on the flashlight?
Answer:
If all the objects are placed at the same angle.
Explanation:
If all the objects are placed at the same angle so all the light from the flashlight shine comes back to the flashlight. If the A object is placed at the specific location at which the mirror X reflects the light after hitting it, then the other E object is placed at the location where the light comes after reflecting the A object then the light comes back to the flashlight if the angle between objects placement is right.
Answer:
d
Explanation:
Consider a 0.70 M solution of HOCl. If the molarity was decreased to 0.3 M, what would happen to the percent dissociation?
Answer:
The percent dissociation would increase
Explanation:
Percent dissociation is the ratio of amount dissociated to the initial concentration.
Decreasing the concentration of the solution leads to an increase in percent dissociation.
I need help answering number 14 A B and C. Thank you!
Answer:
Explanation:
TiO2 + C + 2 CI2 → TiCI4 + CO2
(a)
(2.16 mol TiO2) x (2 mol CI2 / 1 mol TiO2) x ( 70.9064 g C/mol) = 306 g CI2
(b)
(2.16 mol TIO2) x (1 mol C / 1 mol TiO2) x ( 12.01078 g C/mol)n= 25.9 g C
(c)
Use the law of conservation of mass:
(2.16 mol TiO2) x ( 79.8660 g TiO2/mol) + (306 g CI2 + 25.9 g C = 504 g total.
Hope this help!:)
Each polysaccharide tested gives different color results with the iodine test
An ionic compound and a covalent compound are dissolved in separate beakers of H2O. Which solution will conduct an electric current?
Answer:
ionic compound
Explanation:
An ionic compound and a covalent compound react differently when dissolved in water (H2O).
The ionic compounds when dissolved in H2O, undergo a physical change called dissociation. In this change the molecules of water surround the ionic compound and ions of ionic compound disperse uniformly in the water. The complete dissociation of ionic compounds in H2O makes it a strong electrolyte and solution will conduct an electric current.
Some of the covalent compounds also conduct electricity as when they dissolve in H2O, the molecule of covalent compound react chemically with the solvent to produce ions. Generally, covalent compounds are weak electrolytes and do not conduct much electricity as ionic compounds but exception are their such as HCl and benzene.
What is the scientific name of hydrogen -2 and hydrogen -3.
Answer:
Hydrogen 2 is called deuterium, Hydrogen 3 is called Tritium
Explanation:
Hydrogen is the only element whose isotopes have different names in common use today: the 2H (or hydrogen-2) isotope is deuterium and the 3H (or hydrogen-3) isotope is tritium.
How many atoms are in phosgene
Answer:
3 atoms
Explanation:
there is one calcium and two chlorine
What is the concentration of a Kl solution of 20.68 g of solute was dissolved in enough water to form 100. ml of solution?
Answer:
1.25M
Explanation:
Question 2 2 points)
Which of the atoms shown has an atomic number of 42
1
2
4
7
Answer:
4 is the answer
Explanation:
i am not sure for this question
Can someone please help me with this I’ll mark brainliest, in the boxes below label what level of organization might look like?
Answer:
Vascular tissue transports water, minerals, and sugars to different parts of the plant. Vascular tissue is made of two specialized conducting tissues: xylem and phloem. Xylem tissue transports water and nutrients from the roots to different parts of the plant, and also plays a role in structural support in the stem.
Explanation:
HOPE THIS HELPS!
An FCC iron-carbon alloy initially containing 0.20 wt% C is carburized at an elevated temperature and in an atmosphere wherein the surface carbon concentration is maintained at 1.0 wt%. If after 48 h the concentration of carbon is 0.35 wt% at a position 3.9 mm below the surface, determine the temperature at which the treatment was carried out. You will need to use data in the two tables below to solve this problem.
Answer:
Hello the table required is missing attached below is the missing table
Answer : 1299.05 k
Explanation:
Given data :
concentration of carbon ( Cx ) at a position 3.9mm below surface = 0.35
concentration of carbon ( Co ) = 0.20
surface carbon ( Cs ) = 1
Determine the temperature at which the treatment was carried out
first we will determine the value of Z in the table attached
given that the value of erf ( Z ) for Z = 0.8125 from the table
= [tex]\frac{Z- 0.9}{0.95-0.9} = \frac{0.8125-0.797}{0.8209-0.797}[/tex]
make Z subject of the equation
Z = 0.932
next calculate the diffusion coefficient using the relation below
Z = [tex]\frac{x}{2\sqrt{Dt} }[/tex] ----- ( 1 ) where ; z = 0.932 , x = 3.9 mm , t = 48h
0.932 =
x = 3.9 mm = 0.0039 m
t = 48 h = ( 48 *60* 60 ) = 172800 secs
Insert values into equation 2
0.932 = [tex]\frac{0.0039}{2\sqrt{D * 172800} }[/tex]
[tex]\sqrt{D*172800}[/tex] = (0.0039 / 0.932 ) / 2
172800 * D =( 0.0021 )^2
therefore D = 2.55 * 10^-11 m^2/s
Finally calculate the temperature at which the treatment was carried out
D = [tex]Do exp(\frac{-Qd}{RT} )[/tex] ----- ( 3 )
D = 2.55 * 10^-11 m^2/s ,
Do = 2.3*10^-5 m^2/s ( gotten from Diffusion data table )
Qd = 148000 J/mol ( gotten from Diffusion data table )
R = 8.31 J/mol k ( gotten from Diffusion data table )
back to equation 3
D / Do = exp ( -17810 / T )
1.11 * 10^-6 = exp ( -17810 / T )
therefore T = -17810 / ln( 1.11 * 10^-6 )
= - 17810 / -13.71 = 1299.05 k
1. Calculate how many moles of glycine are in a 130.0-g sample of glycine.2. Calculate the percent nitrogen by mass in glycine.
Answer:
[tex]n=1.732mol[/tex]
[tex]\% N=18.7\%[/tex]
Explanation:
Hello!
In this case, since the molecular formula of glycine is C₂H₅NO₂, we realize that the molar mass is 75.07 g/mol; thus, the moles in 130.0 g of glycine are:
[tex]n=130.0g*\frac{1mol}{75.07 g}\\\\ n=1.732mol[/tex]
Furthermore, we can notice 75.07 grams of glycine contains 14.01 grams of nitrogen; thus, the percent nitrogen turns out:
[tex]\% N=\frac{14.01}{75.07}*100\% \\\\\% N=18.7\%[/tex]
Best regards!
Gas law practice problems
LE
gas
A 3.0L sample of carbon dioxide gas at 155 kPa is injected into a 5.0 L vessel. What is the new pressure of the
gas
Answer:
93 kPa
Explanation:
Step 1: Given data
Initial volume of carbon dioxide gas (V₁): 3.0 LInitial pressure of carbon dioxide gas (P₁): 155 kPaFinal volume of carbon dioxide gas (V₂): 5.0 LFinal pressure of carbon dioxide gas (P₂): ?Step 2: Calculate the final pressure of carbon dioxide gas
If we assume carbon dioxide behaves as an ideal gas, we can calculate the final pressure of carbon dioxide gas using Boyle's law.
P₁ × V₁ = P₂ × V₂
P₂ = P₁ × V₁/V₂
P₂ = 155 kPa × 3.0 L/5.0 L = 93 kPa
When a baseball bat hits a baseball, what happens to the energy?
completo ancur
Answer: the baseball bat transfor its energy in the ball.
Explanation: you hit it with one and find out and tell me what you think what happen.
A 32.4 L gas sample at STP is compressed to a volume of 28.4 L, and the temperature is increased to 352 K. What is the new pressure of the gas in atmospheres
Answer:
1.47 atm
Explanation:
Step 1: Given data
Initial volume (V₁): 32.4 LInitial pressure (P₁): 1 atm (standard pressure)Initial temperature (T₁): 273 K (standard temperature)Final volume (V₂): 28.4 LFinal pressure (P₂): ?Final temperature (T₂): 352 KStep 2: Calculate the final pressure of the gas
We can calculate the final pressure of the gas using the combined gas law.
P₁ × V₁ / T₁ = P₂ × V₂ / T₂
P₂ = P₁ × V₁ × T₂ / T₁ × V₂
P₂ = 1 atm × 32.4 L × 352 K / 273 K × 28.4 L = 1.47 atm
what is the smallest substance?
1 .mixture
2 .compound
3 .element
What is the molecular weight of magnesium chloride?
Answer:
Magnesium chloride/Molar mass
95.211 g/mol
Explanation:
Is snow organic or inorganic?
Answer:
snow is made up of a variety of mostly organic matter, including dead or dying animals and phytoplankton, protists, fecal matter, sand, and other inorganic dust.
Explanation:
I hope I helped!!
Plz mark me brainliest it would really make my day!
Answer:
I think its organic unless we are talking about this snow storm then no
which one of the following a compounds a.sugar b.rock salt c.iron d.alloy
which one of the following a
compound ?
a.sugar c.alloy
brock salt d.iron
Answer:
a
Explanation:
sugar is composed of different elements combined in a manner form
the third period element with the largest number of electrons
Answer:
Na
Explanation:
The element sulfur (S) is most likely to form covalent bonds with the element
helium (He).
magnesium (Mg).
zinc (Zn).
oxygen (O).
The element sulfur (S) is most likely to form covalent bonds with the element oxygen. Thus, the correct option for this question is D.
What do you mean by Covalent bonds?Covalent bonds may be defined as a type of chemical bond that significantly involves the mutual sharing of electrons in order to form electron pairs between atoms. This pairing of electrons is simultaneously attracted by the two atomic nuclei.
Sulfur is categorized into the category of nonmetal in group 6A, and therefore it has 6 valence electrons. In order to obey the octet rule, it needs to gain 2 electrons. It can do this by forming 2 single covalent bonds.
The sulfur atom subsequently shares four valence electrons with two oxygen atoms as two covalent double bonds, and shares its remaining two electrons with two oxygen atoms, forming two covalent single bonds.
Therefore, the element sulfur (S) is most likely to form covalent bonds with the element oxygen. Thus, the correct option for this question is D.
To learn more about Covalent bonds, refer to the link:
https://brainly.com/question/3447218
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Methanol has the formula of CH3OH and can be produced by the reaction of carbon monoxide with hydrogen gas. CO + 2 H2 === CH3OH + heat Using the above chemical reaction, determine how each of the following actions would affect the equilibrium of the system. a. heating the mixture b. adding an excess of carbon monoxide c. removing the methanol as it is formed d. adding a substance that reacts with carbon monoxide
Answer:
See explanation below
Explanation:
Let's answer this by parts.
a) As the reaction is naturally exothermic (Exerts heat), increasing temperature means that the reaction will move forward the direction where its absorbing heat
, so the equilibrium will be favored to the reactant side.
b) In this case, the addition of CO, which is a reactant will favor the reaction to the product side. This is because putting more quantity in the reactants will cause that the equilibrium constant K, increase it's innitial value, and this favors the product side.
c) In this case, it happens something similar to case b. This will cause that the reaction will have to work to cover the loss of methanol, therefore, equilibrium will move to the product side too.
d) In this case, we are adding another substance that reacts with CO, so it means that the other reactant is being removed, therefore, the reaction will work to cover this loss but also to cover the adding of the new substance, causing that the K decrease it's value, so equilibrium will be favored to the reactants side.
Hope this helps
How many CaF are in a 1.7x10^25 please I need help fast!!
28 mol CaF
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
[Given] 1.7 × 10²⁵ molecules CaF
[Solve] moles CaF
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
[DA] Set up: [tex]\displaystyle 1.7 \cdot 10^{25} \ molecules \ CaF(\frac{1 \ mol \ CaF}{6.022 \cdot 10^{23} \ molecules \ CaF})[/tex][DA] Multiply/Divide [Cancel out units]: [tex]\displaystyle 28.2298 \ moles \ CaF[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
28.2298 mol CaF ≈ 28 mol CaF
why is plastic a better choice for the slide than aluminum?
Answer:
Plastic is better because it doesn't melt in the microwave but aluminum burns in the microwave
Explanation:
