Answer: A. a sample of liquid benzene at 80ºC and a sample of gaseous benzene at 80ºC
Explanation:
One gram of an acid, HA of unknown molecular mass is dissolved in water and 22.72 cm3 of 0.60 M sodium hydroxide solution added to it in a neutralization reaction. Exactly 7.84 cm3 of 0.530 M HCl was required to neutralize sodium hydroxide by back-titration. i) Write the reaction equations involved in the titration? ii) What is the molecular mass of HA?
Kepler's third law of planetary motion describes the relationship between the
of a planet's orbit and its period,
A. major axis
B. semi-
major axis
C. acceleration
D. velocity
Answer:
B. semi-major axis is the answer, I hope that helps
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:
What determines the chemical properties and physical properties of a mineral?
the specific gravity of the mineral
о
the conditions under which the mineral formed
o the location where it was found
o
the arrangement of the mineral's atoms
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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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
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.
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 structural features do you think contribute to a high thermal conductivity?
HURRY PLEASE!!!!
Answer:
The thermal conductivity of a material is a measure of its ability to conduct heat. It is commonly denoted by k, λ, or κ. Heat transfer occurs at a lower rate in materials of low thermal conductivity than in materials of high thermal conductivity. For instance, metals typically have high thermal conductivity and are very efficient at conducting heat, while the opposite is true for insulating materials like Styrofoam.
Explanation:
got all of the information from the internet
Structural features which contribute to high thermal conductivity are direction of travel of heat ,nature of materials .
How do structural features lead to high thermal conductivity?Thermal conductivity varies greatly according to the structure of material on which it is highly dependent.In anisotropic materials heat flow is greater as the structure is ordered.
According to thermal conductivities, substances are divided to 3 categories like gases, non-metallic solids and metallic solids.Difference in conduction of heat is due to difference in structures .
Gases have low conductivity as their molecules are not tightly packed as those in solids because of which heat transfer is highly dependent on free movement of molecules .In non-metallic solids conductivity is due to vibrations taking place.
Metals have highest thermal conductivity and have both thermal and electrical conductivity.
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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.
How do the coefficients in a balanced equation compare quantities of two
substances?
A. The sum of the coefficients of the reactants equals the sum of the
products.
O B. The ratio of the coefficients equals the ratio of the masses of the
substances.
C. The coefficient of the reactant tells how many product molecules
will form.
D. The ratio of the substances' coefficients equals the ratio of their
number of moles
Answer:
A
Explanation:
The element used most in development of atomic weapons
Answer:
Explanation:
uranium processing.
In an ion the numbers of electrons are...
are the same as the number of protons
not the same as the number of protons
Answer:
Ions. Atoms are neutral; they contain the same number of protons as electrons.
Which statement describes an aluminum (Al) atom?
A) a negatively charged nucleus, surrounded by negatively charged electrons
B) a negatively charged nucleus, surrounded by positively charged electrons
C) a positively charged nucleus, surrounded by negatively charged electrons
D) a positively charged nucleus, surrounded by positively charged electrons
Answer: The phrase which describe an atom is "a positively charged nucleus surrounded by negatively charged electrons". Therefore, the answer is C.
Explanation: Atom is a smallest indivisible particle which is made up of many sub particles. The main sub particles are Protons, Neutrons and Electrons. Protons are positively charged, neutrons doesn't carry any charge hence neutral and electrons are negatively charged. Protons and neutrons are present in nucleus, therefore making the nucleus positively charged, while, electrons revolve around the nucleus in orbit hence being negatively charged particles surrounds the positively charged nucleus.
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 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:
What process powers the movement of the tectonic plates within the upper part of the earth's mantle and
causes the plates to move?
Answer:
The movement of these tectonic plates is likely caused by convection currents in the molten rock in Earth's mantle below the crust. Earthquakes and volcanoes are the short-term results of this tectonic movement.
Explanation:
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:
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
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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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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The process when the more dense plate gets pushed under a less dense plate.
Conduction
Subduction
Answer:
The correct answer is Subduction
Suggest two materials produced from hydrocarbons by the petrochemical industry.
Answer:
The major hydrocarbon products produced from petroleum by refining are: liquefied petroleum gas, gasoline, diesel fuel, kerosene, fuel oil, lubricating oil, and paraffin wax.
Explanation:
hope i helped :)
How many electrons are in Tin's (Sn) highest energy level?
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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Which would have a smaller mass: 3.400 moles of nitrogen or 2.500 moles of magnesium
Answer:
Explanation:
1 mol of N2 = 2 * 14 grams = 28 grams
3.400 moles of N2 = x
x = 3.400 * 28
x = 95.20 grams of Nitrogen
1 mol of magnesium = 24 grams
2.5 moles of magnesium = x Cross multiply
x = 24*2.5
x = 60
The Nitrogen has more mass.
Note: this is a guide on how to do the question. Chemistry has all sorts of periodic tables. Just us the mass numbers in your periodic table.
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.What is the percent mass of potassium chloride in a solution made by adding 25 g of potassium chloride to 70.0 ml of water?
Answer:
26%
Explanation:
The percent mass of potassium chloride in a solution is to be considered as the 26%.
Calculation of the percent mass:Since
mass percent = (mass of solute / total mass of solution ) *100 %
Also,
mass of potassium chloride =25.00g
volume of water= 70.00 ml
Now
mass of solution = mass of solute + mass of solvent
= 25.00 + 70.0
= 95g
Now
mass percent = (mass of solute / total mass of solution ) * 100 %
= (25/95) * 100
= 26.31%
= 26%
Hence, The percent mass of potassium chloride in a solution is to be considered as the 26%.
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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.
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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