Answer:
C. melamine
Explanation:
a thin coating that eliminates reflections and glare from the front and back surfaces of your lenses.
Which all separation method is used in medical field
Answer:
chromatography
Explanation:
this method of separation is used to identify harmful toxins in some medicines
¿A qué grupo pertenecen los átomos de Z = 8, Z= 36 y Z=39? ¿Cuántas capas de electrones tiene cada uno? ¿Cuántos electrones harían falta para llenar la capa más externa?
Answer:
Mira la explicación.
Explanation:
¡Hola!
En este caso, podemos encontrar facilmente el grupo al que pertenecen dichos elementos con números atómicos 8, 36 y 39 respectivamente mediante su búsqueda en la tabla periódica. Así, z=8 corresponde a oxígeno, z=36 a kriptón y z=39 a itrio.
Por otro lado, para saber el número de capas, debemos desarrollar la configuración electrónica para cada uno:
[tex]O: 1s^2,2s^2,2p^4\\Kr: 1s^2,2s^2,2p^6,3s^2,3p^6,4s^2,3d^{10},4p^6\\Y:1s^2,2s^2,2p^6,3s^2,3p^6,4s^2,3d^{10},4p^6,5s^2,4d^1[/tex]
Con esto, vemos que oxígeno tiene dos capas, kripton cuatro capas e iritrio cinco, a lo que a oxígeno le faltan dos electrones para llenar dicha capa, a kripton ninguno y a iritrio nueve.
Saludos.
Which is the stronger acid- sulfuric or ethanoic? What is the evidence for this?
Please answer quickly
Answer:
Sulfuric acid
Explanation:
Sulfuric acid is stronger than ethanoic acid because H+ ions or proton totally ionise in sulfuric acid (H2SO4) whereas in ethanoic acid (CH3COOH) H+ ion partially ionises. The resultant anion of sulfuric acid (HSO4-) is more stable than anion of ethanoic acid (CH3COO-).
So, ethanoic acid is a weak electrolyte and is less stronger than sulfuric acid.
Hence, the correct answer is sulfuric acid.
For question numbers 1 and 2, two statements are given - one labelled
Answer to these questions from the codes (i), (ii), (ub and (iv) as given
Both (A) and (R) are true and (R) is correct explanation of the
assertion (A).
(ii)
Both (A) and (R) are true, but (R) is not the correct explanation of
the assertion (A).
(iii)
(A) is true, but (R) is false.
(iv) (A) is false, but (R) is true.
Assertion (A) : Carbon has a strong tendency to either lose or gain
electrons to attain noble gas configuration.
Reason (R):
Carbon has four electrons in its outermost shell and has
the tendency to share electrons with carbon or other
elements.
Assertion (A) and the other labelled Reason (R). Select the correct
Answer:
(iv) (A) is false, but (R) is true.
Explanation:
It is not true that carbon has a strong tendency to either lose or gain electrons to attain noble gas configuration. Carbon is a member of group 14, it is the first member of the group and carbon is purely a non metal. Only metals metals can loose electrons to attain the noble gas configuration. Moreover, carbon does not participate in ionic bonding so it does not gain electrons to attain the noble gas configuration.
However, carbon participates in covalent bonding where it is covalently bonded to four other chemical species using its four outermost electrons. Carbon forms covalent bonds in which four electrons are shared with other chemical species.
If you have a volume of 10 mL and a mass of 100 kg, what is the density?
Describe how you would draw a diagram that shows the electric field between two particles that attract each other.
Answer:
Since the particles attract each other, I would draw one positive (+) charge close to one negative (–) charge. To show the electric field, I would draw lines coming out in all directions from each charge. Then I would add arrows pointing away from the + charge and pointing toward the – charge. Finally, I would connect the lines coming from the + charge to the ones going toward the – charge to make the loops of the electric field.
Explanation:
this is definitely the right answer my teacher accidently gave me the answer
your welcome
According to the forces of attraction, the diagram representing the electric field between two particles that attract each other is drawn showing two unlike poles towards towards each other.
What are forces of attraction?Forces of attraction is a force by which atoms in a molecule combine. it is basically an attractive force in nature. It can act between an ion and an atom as well.It varies for different states of matter that is solids, liquids and gases.
The forces of attraction are maximum in solids as the molecules present in solid are tightly held while it is minimum in gases as the molecules are far apart . The forces of attraction in liquids is intermediate of solids and gases.
The physical properties such as melting point, boiling point, density are all dependent on forces of attraction which exists in the substances.
Learn more about forces of attraction,here:
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#SPJ2
Hydrogen + Nitrogen
Ammonia
Answer:
Ammonia, NH3, is a chemical compound composed of one nitrogen atom and three hydrogen atoms.
Explanation:
i hope this will help you :)
Answer:
3H2 + N2 ---> 2NH3
Explanation:
3H2 + N2 ---> 2NH3
Hydrogen + Nitrogen Ammonia
The solubility of Z is 60 g/ 100 g water at 20 °C. How many grams of solution are produced when a saturated solution is prepared using 300 grams of water at the same temperature? a 240 b 180 c 120 d 480
Answer:
Saturated solution = 180 gram
Explanation:
Given:
Solubility of Z = 60 g / 100 g water
Given temperature = 20°C
Amount of water = 300 grams
Find:
Saturated solution
Computation:
Saturated solution = [Solubility of Z] × Amount of water
Saturated solution = [60 g / 100 g] × 300 grams
Saturated solution = [0.6] × 300 grams
Saturated solution = 180 gram
help me help ASAP please help and explain what this means helllllllp with this
what does this mean: the Ohhh difference is that matter has rearranged into different compounds.
Answer:
In my world, the term ASAP usually means “I need it now,” or, “As quickly as you can,” and sometimes even, “Drop everything you're doing and do this right now.” But if I'm asking someone to complete a task via e-mail, G-chat or a Post-It note, the urgency behind my “ASAP” can't be heard.
Explanation:
I hope it helps you please mark me as brainlist. Bye
Answer:
Explanation:
Hhh
You have been assigned to prepare 50.0 mL of a 3.0 %(v/v) solution in a volumetric flask from a 20.0% (v/v) Red Food Coloring (RFC) stock solution provided. Use the equation below to calculate the amount in (mL) of the RFC stock solution to prepare your assigned % solution.
Answer:
7.5mL of the stock solution
Explanation:
A stock solution is a concentrated solution that is used to make another more diluted solution.
In the problem, the RFC solution is 20% (v/v). That means contains 20mL of RFC in 100mL of solution.
Yo need to prepare 50.0mL of a 3.0% (v/v), solution (3mL of RFC in 100mL of solution). That means you need:
50.0mL solution × (3mL RFC / 100mL solution) = 1.5mL of RFC. These RFC must come from the stock solution
As your stock solution contains 20mL of RFC per 100mL of solution, you will need:
1.5mL RFC × (100mL stock / 20mL RFC) =
7.5mL of the stock solutionYou are on an island and need freshwater to drink. Which process could you
use to separate the salt from ocean water and provide freshwater for
drinking?
O A. Distillation
B. Chromatography
C. Filtering
O D. Freezing
Answer:
A
Explanation:
The reason it is distillation is due to the fact that we can use distillation to heat the ocean water. As water has a lower boiling point than the salt solution, it evaporates and the salt stays behind.
The quantum numbers of six electrons are given bellow .Arrange them in order to increasing energies. (a) n= 4,l =2, m= -2, s= -1/2 (b) n=3, l=2, m=1, s=+1/2 © n=4, l=1, m = 0, s=+1/2 (d) n=3, l=2, m= -2, s= -1/2 (e) n=3,l=1, m = -1, s =+1/2 (f) n=4, l=1, m=0, s = +1/2
Answer:
e< d< b< c=f< a
Explanation:
Quantum numbers refers to values that exactly describe the energy of electrons within an atom or a molecule. Electrons are known to possess a set of four quantum numbers used in describing the energy state of such electron. These quantum numbers are solutions to the Schrödinger wave equation for the hydrogen atom.
In describing any electron within the atom, the relevant set of four quantum numbers are: principal quantum number (n), orbital, azimuthal, subsidiary or angular momentum quantum number (l), magnetic quantum number (ml), and spin quantum number (ms).
In the arrangement above, the electrons are arranged in order of increasing energy. Each arrangement of quantum numbers corresponds to a particular energy state of the electron.
When a catalyst is added to a reversible reaction in equilibrium state the value of equilibrium constant
Explanation:
The value of equilibrium constant doesn't change when a catalyst is added.
Equilibrium constant depends on Concentration of reactants , Pressure and Temperature.
A suitable catalyst can improve the reaction rate. A catalyst is a material that increases the rate of a chemical reaction, but in the end, it remains unchanged chemically. It offers a lower energy alternative reaction path.
The balance of forwarding and reverse reaction rates is equal for a reversible reaction. In the presence of a catalyst, both reaction rates accelerate and expect the users to weigh more quickly.It is important to remember that adding a catalyst has no impact at all on the final balance of said reaction, which is faster.Learn more:
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Name the 2 fractions of petroleum which are used as fuel. Explain.
Answer: kerosene, coal
Explanation:
These are renewable resources obtained from petroleum, kerosene was used in olden times to light the lamps and are still used today for lighting purposes. Coal was used in trains to produce steam( steam powered trains).
Answer:
Fuel Oil and Kerosene Oil are used as fuel. They are an important part of our life. Kerosene Oil is primarily used in the laboratory. Fuel Oil is used in power stations.
what is the chemical test to differentiate ethanol from ethanoic acid
Answer:
We can distinguish between ethanol and ethanoic acid by reacting them with a metallic carbonate like Na2CO3 or a bicarbonate like NaHCO3 ....... ethanoic acid reacts to give to give CO2 and no reaction takes place in case of ethanol.
what is the name of the process used in the industrial preparation of tetraoxosulphate VI acid
Answer:
haaaaaaaaaaaaaaaaaaaaaa
Answer:
Contact process
Explanation:
commercially,tetraoxosulphate Vl acid is prepared by the contact process
zinc is very essential element for human body, why? give reason.
Answer: Function
Explanation: Zinc is found in cells throughout the body.
It is needed for the body's defensive (immune) system to properly work.
It plays a role in cell division, cell growth, wound healing, and the breakdown of carbohydrates.
what's sodium chromate formula without subscript
Answer:
Na2CrO4
Explanation:
it cannot be without subscript
8. What is the name of this compound?
CH3
CH3-C-Br
CH₃
sec-butyl bromide
tert-butyl bromide
isopropyl bromide
isobutyl bromide
Answer:
tert-butyl bromide
Explanation:
sec-butyl bromide
CH3 -CH-CH2-CH3
Br
tert-butyl bromide
CH3
CH3-C- Br
CH3
isopropyl bromide
CH3
CH3-CH-Br
isobutyl bromide
CH3
CH3-CH-CH2-Br
Which objects will most likely float
Dr. Tate and Dr. Ramirez are observing the effects of a type of solar activity that has reached the planet Jupiter. What solar activity are they observing? a.solar flares b.sunspots c.prominences d. solar winds
Answer:
d. solar winds
Explanation:
Dr. Tate and Dr. Ramirez are observing solar winds coming from the sun. Solar winds occurs naturally in which the particles such as electrons and photons releases from the surface of the sun into the space. These solar winds moves in the solar system and interact with planets of the solar system. Dr. Tate and Dr. Ramirez are the two well known scientist observing the effects of solar winds that has reached the planet Jupiter.
Boiling point of water at 750 mmHg is 99.63⁰C. How much sucrose is to be added to 500 g of water such that it boils at 100⁰C. Kb for water 0.52 K Kg mol-1
Answer:
121.67 g is to be added to 500 g of water
Explanation:
Given that:
Pressure = 750 mmHg
Temperature T₁= 99.63⁰C = (273 + 99.63 ) = 372.63K
mass of water = 500 g
Temperature T₂ = 100⁰C = ( 273 + 100) K = 373 K
where;
Kb for water 0.52 K Kg mol-1
For sucrose; C₁₂ H₂₂ O₁₁
Molar mass = ( 12 × 12 )+ ( 1 × 22 ) + ( 16 × 11 )
Molar mass = 342 g/mol
ΔT = T₂ - T₁
ΔT = (373 - 372.63)K
ΔT = 0.37 K
∴ the amount of sucrose to be added to 500 g of water is:
[tex]= \dfrac{0.37\times 342 \times 500}{0.52 \times 1000 }[/tex]
[tex]= \dfrac{6327}{52}[/tex]
= 121.67 g
Thus; 121.67 g is to be added to 500 g of water
how many hydrogen atoms do you have four molecules of glucoes
Molecules of glucose (blood sugar) contain 6 carbon atoms, 12 hydrogen atoms, and 6 oxygen atoms.
Hope this helped :)
An aqueous solution of glucose (MM = 180.2 g/mol) has a molality of 2.27 m and a density of 1.20 g/mL. What is the molarity of glucose in the solution?
**Any help would be greatly appreciated!**
Answer:
Molarity of the glucose solution = 2.72 mol/L
Explanation:
Molality of a solution is defined as the number of moles of solute per kilogram of solvent.
Therefore , a 2.27 molal solution of glucose contains 2.27 moles of glucose in 1 Kg of solvent
Density of solution = 1.20 g/mL
The volume occupied by 1 Kg or 1000 g solution = mass/density
Volume of 1000 g solution = 1000 g/1.20 g/ml = 833.3 mL
Number of moles of glucose present in the solution = 2.27 moles
Molarity = number of moles / volume(L)
volume of solution in litres = 883.3/1000 = 0.8333 L
Molarity = 2.27 moles /0.8333 l = 2.72 mol/L
Therefore, molarity of the glucose solution = 2.72 mol/L
The molarity of the glucose in the solution has been 2.72 mol/L.
Molality can be defined as the moles of the solute per kg of solvent.
The molality of glucose solution = 2.27 m
2.27 moles of glucose in 1000 grams of water.
Density has been the mass per unit volume. The density can be expressed as:
Density = [tex]\rm \dfrac{Mass}{Volume}[/tex]
The density of the given glucose solution = 1.20 g/ml
The volume of 1000 grams of water has been:
Volume = [tex]\rm \dfrac{Mass}{Density}[/tex]
Volume of 1000 grams water = [tex]\rm \dfrac{1000\;g}{1.20\;g/ml}[/tex]
Volume of 1000 g water = 833.3 ml
The molarity can be defined as the mass of solute per liter of the solution.
Molarity = [tex]\rm moles\;\times\;\dfrac{1000}{Volume\;(ml)}[/tex] ......(i)
The moles of glucose in the 833.3 ml solution have been 2.27 mol.
Substituting the values in equation (i):
Molarity = 2.27 mol [tex]\rm \times\;\dfrac{1000}{833.3\;ml}[/tex]
Molarity = 2.72 mol/L.
The molarity of the glucose in the solution has been 2.72 mol/L.
For more information about the molarity of the solution, refer to the link:
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What marine province contains deep ocean trenches that form along convergent plate boundaries as a result of subduction?
A. Mid-ocean ridge
B. Deep ocean basin
C. Abyssal plain
. Continental margin
Answer:
A.Mid ocean ridge i think
Explanation:
your answer is B my guy
What molecule can form hydrogen bonds with others like it A. CF4 B. HCL C. CO2 D. NH3
Answer:
D. NH3
Explanation:
Hydrogen bonding exists only between hydrogen atoms, and is one of the strongest intramolecular forces. So you eliminate your choices down to B and D. HCl can't form Hydrogen bonding because of electron density and electronegativity but NH3 can, so your answer would be D.
Valency of Chlorine is 1. Why?
Answer:
Valency of Chlorine is 1 because it needs 1 electron to complete its octet (a shell of eight electrons). Valency is defined as "The combining power of an element" and Since, chlorine needs 1 electron to complete its valence shell, Its valency is 1.
Fredo’s spaceship takes him to the very edge of known space. There, gravity has no effect at all. Fredo takes a baseball and tosses it into space. What will most likely happen to the ball? It will not move at all. It will return to Fredo’s spaceship. It will eventually stop moving. It will continue moving in a straight line.
Answer:
D. It will continue moving in a straight line.
Explanation:
When Fredo takes a ball and tosses it into space, the ball will move upward infinitely.
Gravity is the downward force that acts on an object.
Without gravity, or without the effect of gravity, an object will continue to move in its path with the original direction applied to it.
Answer:
D
Explanation:
I took the test
1 Cup of Boiling Water
WAPHS Swimming Pool
(100 °C)
or
(25 °C)
• What is the difference between thermal energy and
temperature?
aterials
Enosh
Odates
ades
stery
endance
mbers
• The boiling water has a much higher temperature... What
does that mean?
nferences
enuity Ele
enuity se
sela
• Which has more thermal energy? Why?
Note Cla
Learnir
9
1 Mop
Answer:
Side photo
A small still is separating propane and butane at 135 °C, and initially contains 10 kg moles of a mixture whose composition is x = 0.3 (x = mole fraction butane). Additional mixture (x = 0.3) is fed at the rate of 5 kg mole/hr. The total volume of the liquid in the still is constant, and the concentration of the vapor from the still (xp) is related to x, as follows: Xp = How long will it take for X, to change from 0.3 to 0.35.
Answer: A swimming pool at 40°C is at a lower temperature than a cup of tea at 90°C. However, the swimming pool contains a lot more water. Therefore, the pool has more thermal energy than the cup of tea even though the tea is hotter than the water in the pool.
Explanation: Heat and Temperature do not mean the same thing. ... A swimming pool at 40°C is at a lower temperature than a cup of tea at 90°C. However, the swimming pool contains a lot more water. Therefore, the pool has more thermal energy than the cup of tea even though the tea is hotter than the water in the pool.
Calculate the mass of 2.50 mol of CH,OH(1). Show your work. Use the appropriate
number of significant digits in your final answer.
Help please
Answer:
80.1 grams
Explanation:
Find the molar mass of CH3OH first by using the periodic table values.
12.011 g/mol C + (1.008*3 g/mol H) + 15.999g/mol O + 1.008 g/mol H
=32.042 so that is the molar mass
Now that you have 2.50 moles of CH3OH, you can calculate the mass in g
2.50molCH3OH * (32.042g CH3OH / 1 mol CH3OH) = 80.105
32.042g / 1 mol is the same as 32.042 g/mol
Since there are 3 sig figs in the problem (2.50 has 3 sig figs), you round to 80.1 g CH3OH