Answer:
2.12g/mol
Explanation: quick maths
1. Which common material is a polyamide that is melted and then spun into strong fibers?
A) polyethylene
B) rubber
C)nylon
D)cellulose
Answer:
C
Explanation:
Hope it helps!
What is thermoplastics?
Answer:
A thermoplastic is any plastic material with a low melting point that becomes molten when heated, solid when cooled, and can be re-melted or molded after cooling. The curing process is completely reversible, and doing so will not compromise the material's physical integrity.
Credit to:https://www.fastradius.com/resources/thermoplastics-thermosets/#:~:text=A%20thermoplastic%20is%20any%20plastic,compromise%20the%20material's%20physical%20integrity.
Explanation:
b. Sugar and salt are both white, crystalline powders that dissolve in water. If you were given an unknown sample that contained one or both of these solids, how could you determine what your unknown sample contained (without tasting it)? (2 points)
We can distinguish between sugar and salt without tasting but using some chemical tests. Adding silver nitrate to the solution will produce a white precipitate if chloride is present in it. Similarly if the solution is dehydrates the brown colored solid remains indicates the presence of sugar.
What is qualitative analysis ?Qualitative analysis are used to test the quality or identity of a sample or compound. The samples are treated with other compounds to test for the anions or cations present in them.
For sugar, we can use sulphuric acid testing or boiling. Just boil the solution to test whether it gives a brown dehydrate.
Similarly we can check for chloride ions if salt is present. Add some silver nitrate to the sample. If it produces a white precipitate, it contains salt. The formed precipitate is silver chloride.
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For the reaction, a 0.9621 g sample of an unknown aqueous hydrogen peroxide solution required 11.07 mL of 0.0200 M KMnO4. Calculate the mass percent peroxide (to two decimal places) in the unknown sample. The molar mass of H_{2}O_{2}
A 0.9621 g sample, whose mass percent of hydrogen peroxide is 1.17% requires 11.07 mL of 0.0200 M KMnO₄ to react completely.
Let's consider the balanced equation for the reaction between H₂O₂ and KMnO₄.
2 KMnO₄ + 3 H₂O₂ → 3 O₂ + 2 MnO₂ + 2 KOH + 2 H₂O
11.07 mL of 0.0200 M KMnO₄ react. We can calculate the reacting mass of H₂O₂ considering that:
The molar ratio of KMnO₄ to H₂O₂ is 2:3.The molar mass of H₂O₂ is 34.01 g/mol.[tex]0.01107L\ KMnO_4 \times \frac{0.0200mol KMnO_4}{1L\ KMnO_4} \times \frac{3molH_2O_2}{2molKMnO_4} \times \frac{34.01gH_2O_2}{1molH_2O_2} =0.0113gH_2O_2[/tex]
0.0113 g of H₂O₂ are in 0.9621 g of the sample. The mass percent of H₂O₂ in the sample is:
[tex]\% H_2O_2 = \frac{0.0113g}{0.9621g} \times 100\% = 1.17\%[/tex]
A 0.9621 g sample, whose mass percent of hydrogen peroxide is 1.17% requires 11.07 mL of 0.0200 M KMnO₄ to react completely.
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The element used most in development of atomic weapons
Answer:
Explanation:
uranium processing.
Which of the following correctly identifies the intermolecular force represented by A and compared its strength relative to the intermolecular force represented by B
A represents hydrogen bonding, which is weaker than the force represented by B correctly identifies the intermolecular force represented by A and compared its strength relative to the intermolecular force represented by B. Therefore, option B is correct.
What is intermolecular force ?Intermolecular forces, such as electromagnetic forces of attraction or repulsion that act between atoms and other kinds of nearby particles, such as atoms or ions, mediate interactions between molecules.
The forces that draw molecules together are known as intermolecular forces. These forces are crucial because they enable chemists to ascertain a substance's state, melting point, boiling temperature, and other physical characteristics. The higher the melting and boiling temperatures are, the stronger the intermolecular forces are.
The strength of the London force will differ greatly if the molecules have highly different molar masses (by a factor of 2 or more).
Thus, option B is correct.
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your question is incomplete, probably the question was Which of the following correctly identifies the intermolecular force represented by A and compared its strength relative to the intermolecular force represented by B A represents London dispersion forces, which are weaker than the force represented by B. A represents hydrogen bonding, which is weaker than the force represented by B. A represents London dispersion forces, which are stronger than the force represented by B. A represents hydrogen bonding, which is stronger than the force represented by B.
Koja od navedenih atomskih orbitala nije moguća? a) 2d b) 3s c) 4p d) 5f
Answer:
2d
Explanation:
2d nije moguće. moguće je samo 3d do 7d. provjeri periodni sustav!
ako ne razumiješ, obrati mi pažnju
BRAINLIEST PLEASE HELP!!!
Which of the following best describes the fusion of hydrogen into helium?
Question 2 options:
4 H combine to form 2 He
6 H combine to form 2 He which combine to form 2 H and 1 He
1 He combines to form 2 H which combine to form 2 He and 6 H
2 H combine to for He
How does the density of salt water differ from that of freshwater
Answer:
denser than freshwater due to the sodium chloride dissolved in it.
Explanation:
t. This means that a specific volume of salt water is heaver than the same volume of freshwater. ... While colder water is denser, when water freezes into ice, it becomes less dense and floats on the surface
what shows the substance at the highest temperature?
Answer:
needs more information
Explanation:
We need more information (like picture options / etc), but a substance at it's highest temperature will have the most movement in it's molecules. Depending on the substance, it may be in a gas or plasma form (free moving molecules).
Hope this helps, have a nice day! :D
What do these two changes have in common?
Please help me !!!!!!!!!!!!!!!!!!!!!!
Answer:
sure ill help you
Explanation:
state three properties of oxygen
Answer:
Color : Colorless.
Phase : Gas. ...
Odor : Oxygen is an odorless gas.
Taste : A tasteless gas.
Conductivity : A poor conductor of heat and electricity.
Solubility : Slightly soluble in water, alcohol and some other common liquids.
Density : It is denser than air.
Explanation:
Suppose that 25.0 mL of 0.440 M sodium chloride is added to 25.0 mL of 0.320 M silver nitrate. How many moles of silver chloride precipitate? What would be the concentrations of each of the ions in the reaction mixture after the reaction?
The number of moles of silver chloride that will precipitate is 0.008 mole
From the question,
We are to determine the number of moles of silver chloride that will precipitate
First,
We will write a balanced chemical equation for the reaction
The balanced chemical equation for the reaction is
NaCl + AgNO₃ → AgCl + NaNO₃
This means
1 mole of sodium chloride reacts with 1 mole of silver nitrate to produce 1 mole of silver chloride and 1 mole of sodium nitrate
Now, we will determine the number of moles of each reactant present
For sodium chloride (NaCl)Concentration = 0.440 M
Volume = 25.0 mL = 0.025 L
Using the formula
Number of moles = Concentration × Volume
∴ Number of moles of NaCl present = 0.440 × 0.025
Number of moles of NaCl present = 0.011 mole
For silver nitrate (NaNO₃)Concentration = 0.320 M
Volume = 25.0 mL = 0.025 L
∴ Number of moles of NaNO₃ present = 0.320 × 0.025
Number of moles of NaNO₃ present = 0.008 mole
From the balanced chemical equation,
1 mole of sodium chloride reacts with 1 mole of silver nitrate to produce 1 mole of silver chloride
Then,
0.008 mole of sodium chloride will react with the 0.008 mole of silver nitrate to produce 0.008 mole of silver chloride
∴ 0.008 mole of silver chloride will be produced
Hence, the number of moles of silver chloride that will precipitate is 0.008 mole
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what are two ways to increase thermal energy are
If 6 electrons are available to fill five empty 6d atomic orbitals, how will the electrons be distributed in the five orbitals?
one electron in each orbital
two electrons in 3 orbitals and none in the other 2
two electrons in one orbital and one electron in the other four
six electrons cannot fill five empty 6d atomic orbitals
Answer:
Option C
Explanation:
According to Hund's rule
pairing of electrons occur first in lower energy orbitals then in orbitals having higher energy.d subshell has 5 orbitals.
so first these 5 get filled.The. one will be added to first one.A __________ compound is a cyclic compound in which one or more of the ring atoms is an atom other than carbon. g
Answer:
heterocyclic compound
Explanation: by the fact that some or all of the atoms in their molecules are joined in rings containing at least one atom of an element other than carbon
Using the name of the ionic compound, select the appropriate chemical formula. Use the periodic table
that has been provided. Click here to access the common polyatomic ion sheet.
Sodium acetate
a. NaC2H302
b. SC2H302
c. Na2C2H302
Answer:
A
Explanation:
Abcd
The chemical formula for sodium acetate is NaCH₃COO.
What is the chemical formula?A symbolic representation of the chemical composition of an element or a compound is its chemical formula. The chemical formula helps in providing information about the elements that make up the molecules of a compound. It also represents the ratio in which the atoms of these elements combine to form such molecules.
For example, H₂O, which is the chemical formula for water, shows that there are two hydrogen atoms combined with one oxygen atom to form one molecule of water.
For writing a chemical formula, it is important that there is knowledge of the symbols of the elements that are present in the compound. The formula of the radicals should be known along with the valency of the elements in that compound.
Therefore, the chemical formula for sodium acetate is NaCH₃COO.
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A 20.0-L nickel container was charged with 0.833 atm of xenon gas and 1.28 atm of fluorine gas at 400°C. The xenon and fluorine react to form xenon tetrafluoride. What mass (g) of xenon tetrafluoride can be produced assuming 100% yield?
Answer:
A 20.0 L
20.0
L
nickel container was charged with 0.500 atm
0.500
a
t
m
of xenon gas and 1.50 atm
1.50
a
t
m
of fluorine gas at 400 ∘C
400
∘
C
. The xenon and fluorine react to form xenon tetrafluoride. What mass of xenon tetrafluoride can be produced assuming 100%
100
%
yield?
Explanation:
How many electrons are in Tin's (Sn) highest energy level?
1. Name three obstacles that Mendeleev faced in his life?
Answer:
was difficult to place isotopes of elements as they have the same chemical properties but different atomic masses. It was not possible to predict how many elements could be discovered between two heavy elements as the rise in atomic mass is not uniform.
The three obstacles that Mendeleev faced in his life include the following:
He found it difficult to place isotopes of elements in a group He found it difficult to fit some elements in the periodic table.He had marital problems which made him practice bigamy.Who was Mendeleev?Mendeleev was of Russian region and was instrumental in the formation of
the periodic law and table. He faced several challenges such as marital
issues and also in the formulation of the periodic table as it became
ambiguous for him.
He couldn't fit in some elements on the table due to differences in the order
of atomic masses .
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3CH4 and C3H12 have the same number and kind of elements. How are they different?
3CH4 refers to three molecules of a compound and C3H12 refers to only one molecule of a compound.
3CH4 and C3H12 are actually different molecules though they contain the same number and types of atoms. Recall that both of them are hydrocarbons hence they contain only hydrogen and carbon.
3CH4 refers to three molecules of methane while C3H12 refers to one molecule of diphenyl methane. Hence 3CH4 refers to three molecules of a compound and C3H12 refers to only one molecule of a compound.
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Which of the following statements is true?
All physical properties depend on how much material you have.
Some physical properties, like mass, volume, and density, depend on how much material you have.
The density of a material may differ as it changes state.
Changing the state of a material from solid to gas, for example, generally makes the material more dense.
Answer:
Es la tercera por qué cuando el material varía va cambiando de estado
Explanation:
The volume of a gas varies inversely as the pressure upon it. The volume of a gas is 1600 cm3 under a pressure of 4 kg/2. What will be its volume under a pressure of 640 kg/cm2?
Answer:
10cm3
v ∞ 1\p
by introducing a constant k
v = k\p
making k subject of the formula
k= vp
k= 1600×4
k=6400
to find the second volume
k=vp
6400=v×640
v=6400\640
v=10cm3
What is the molecular geometry about the antimony atom in the structure below?
[Image description: A Sb atom is singly bound to five Fatoms. There is one electron pair on Sb. Each Fhas
three electron pairs. The molecule as a 2- charge.]
720
FF
Answer:
Square Pyramidal.
Explanation:
Because the Sb atom has six electron domains (five bounded and one unbounded), its electron domain geometry is octahedral.
Because one electron domain is unbounded, its molecular geometry is square pyramidal.
pls help 25 pts
Describe the energy levels in the quantum mechanical model of the atom. How does the spacing change as the energy levels get further from the nucleus?
Answer:
In the quantum-mechanical model of an atom, electrons in the same atom that have the same principal quantum number (n) or principal energy level are said to occupy an electron shell of the atom. Orbitals define regions in space where you are likely to find electrons.
The process when the more dense plate gets pushed under a less dense plate.
Conduction
Subduction
Answer:
The correct answer is Subduction
I need to solve #5 and #6
Answer:
hello
Explanation
sup
help please thank you so muchhh
³
hope it helps!correct me if I'm wrong
What amino acid covalently bind transport and store ammonia
Answer:
Which amino acid bind ammonia?
Ammonia is loaded via glutamine synthetase by the reaction, NH3 + glutamate → glutamine. It occurs in nearly all tissues of the body.
