Write any four properties of fullerence (c60)
[tex]{ \boxed{ \blue{ \sf{properties \: of \: fullerence}}}}[/tex]
• Man made allotrope of carbon obtained from graphite which when treated with [tex]CS_{2}[/tex]
• sp² hybridised.
• Dark shining and conducts electricity.
• It has 20 hexagonal and 12 pentagonal.
If 2.5 ggiven off? of KCLO3 were heated in a test tube, how many grams of oxygen gas should be
Answer:
1.46878825 g O_3
Explanation:
the balanced equation is:
2 KClO_3 = 2 KCl + 3 O_2
using stoichiometry, you can find the amount of O_2 produced from 2.5 g KClO_3
2.5 g KClO_3 x (1 mol / 122.55 g KClO_3) x (3 mol O_3 / 2 mol KClO_3) x (48 g O_3 / 1 mol O_3) = 1.46878825 g O_3
Calculate the molecular formula for a compound whose empirical formula is CH2O and molar mass is 150.0 g/mol.
Step 1: Calculate the molar mass for the empirical formula.
What is the molar mass of CH2O?
(C=12.01 amu, H=1.01 amu, O=16.00 amu) [?] g/mol CH₂O
The molecular formula is (CH2O)5 when the scale factor is 5 and the empirical formula is CH2O.
Considering the question given above, the following data were obtained:
Empirical formula = CH₂O
Molar mass of compound = 150 g/mol
Scaling factor (n) =?
Empirical formula × n = molar mass
[CH₂O]n = 150
[12 + (2×1) + 16]n = 150
[12 + 2 + 16]n = 150
30n = 150
Divide both sides by 30
n = 5
Therefore, the scaling factor is 5
A scale factor is a ratio between corresponding measurements of an object and a representation of that object.In chemistry, the empirical formula of a chemical compound is the simplest whole-number ratio of atoms present in a compound. .Learn more about empirical formula at:
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A periods number on the periodic table corresponds to the number of:_____.
Explanation:
highest principal quantum number of the elements in the period
A periods number on the periodic table corresponds to the number of principal quantum number.
What does principal quantum number signify?
The orbit or shell in which an electron is placed in relation to the atom's nucleus is described by its primary quantum number.
The letter n designates this level.Energy levels, subshells, and atomic orbitals can all be used to describe the configuration of electrons surrounding an atom's nucleus.The total number of shells in which electrons are found in an atom is equal to the row, or period, number that an element occupies on the periodic table. The periodic table's period (or row) to which an atom belongs is represented by the greatest energy level number (1–7) for its electrons.Hence, Each period in the periodic table corresponds to a principal energy level.
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The rock sample on the left is basalt, a type of igneous rock. Heat and intense
pressure changed the basalt into blueschist, a type of metamorphic rock.
Which characteristics of the rock sample changed?
The rock sample on the left is basalt, a type of igneous rock. Heat and intense pressure changed the basalt into blueschist, a type of metamorphic rock glaucophane schist
Blueschist facies is determined by the particular temprature and pressure condition required to metamorphose basalt to form blueschist and felsic rock and pelitic sediment which are subjected to blueschist facies condition will form different mineral assemblages then metamorphosed and blueschist facies rock are generally formed in subduction zones where oceanic crust is being stuffed into a trench that will become true blueschist once they were pressure cooked and also called glaucophane schist and is a metavolcanic rock that with similar composition at high pressure and low temprature
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steric number of benzene
The hybridization of benzene is sp² hybridizes the benzene is combination of carbon and hydrogen . the steric number of benzene of central atom carbon is 3.
The formula for the count of steric number is given as :
steric number = number of the lone pairs on the central metal atom + the number of atom bonded with the central atom. The benzene contain the 6 carbon atom an the 6 hydrogen atom. the central atom here is carbon. the benzene have 12 sigma bonds and 3 pi bond mean double bond. The total number of covalent bond is 15.
Thus, The hybridization of benzene is sp² hybridizes the benzene is combination of carbon and hydrogen . the steric number of benzene of central atom carbon is 3.
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In two or more comeplete sentences explain how to ballance the chemical equation and classify its reaction type.___ P4+ O2---->___ P2O3
Answer:
Put a coefficient of 2 in front of P4. Then a coefficient of 6 in front of O2. Then a coefficient of 4 in front of P2O3.
Explanation:
This is a synthesis reaction because of the two different atoms form a compound
A sample of ideal gas is in a sealed container. The pressure of the gas is 735 torr , and the temperature is 6 ∘C . If the temperature changes to 74 ∘C with no change in volume or amount of gas, what is the new pressure, P2 , of the gas inside the container?
Express your answer with the appropriate units.
The final pressure of the gas is 914 torr. This is obtained by the use of the ideal gas equation and its parameters.
What is the ne pressure?The ideal gases are those kind of gases to which we can be able to apply the ideal conditions. Let us recall that the laws of the ideal gas pertains to the gases that are in the ideal condition. This implies that the gases are at a low pressure and a high temperature.
Now we have that;
Initial pressure P1 = 735 torr
Final pressure of the gas P2 = ??
Initial temperature of the gas T1 = 6 ∘C or 279 K
Final temperature of the gas T2 = 74 ∘C or 347 K
Then by the use of the formula;
P1/T1 = P2/T2
P1T2 = P2T1
P2 = P1T2/T1
P2 = 735 * 347 /279
P2 = 914 torr
The pressure that the gas would have at the end of the process is 914 torr.
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SC.8.P
2. Construct Arguments Suppose you are a
construction worker. You use aluminum for a
window frame, copper for wiring, and iron for
nails. Use the properties of these materials to
justify their specific uses.
The aluminum use for a window frame , copper for wiring and iron for nail because of they are malleable , ductile, good conductor of electricity and high energy efficiency.
The aluminum is used for window because aluminum is malleable and the aluminum have high energy efficiency. The copper is used as for the wiring because the copper is the good conductor of the electricity. The iron is use for the nail because iron is hard and have the tendency to resist the corrosion.
Thus, The aluminum use for a window frame , copper for wiring and iron for nail because of they are malleable , ductile , good conductor of electricity and high energy efficiency.
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A 32.9 L sample of a gas at constant pressure increases in temperature from 25C to 45C. Should the volume increase or decrease?
If the temperature of the sample of gas changes from 25°C to 45°C, the volume of the gas will increase.
What is Charles's law?Charles's law is the gas law stating that the density of an ideal gas is inversely proportional to its temperature at constant pressure.
In other words, the law states the volume of a gas is directly proportional to the temperature of the gas. The equation is given as follows:
V₁/T₁ = V₂/T₂
Where;
V₁ and T₁ are the initial volume and temperatureV₂ and T₂ are the final volume and temperature respectively.According to this question, a sample of a gas at constant pressure increases in temperature from 25°C to 45°C. This means that as the temperature increases, the volume also increases.
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Conservation of matter article questions
The Law of conservation of mass states that option C: matter is neither created nor destroyed.
What is the law of conservation of matter?Physical and chemical changes can cause matter to transform into different forms, but no matter what happens, matter is always conserved. There is no creation or destruction of matter; the amount of matter is the same before and after the transformation.
The principle of matter conservation. argues that matter cannot be generated or destroyed during a chemical reaction. The same number of atoms exist before and after the alterations even though the matter may shift from one form to another. reactant.
Therefore, According to the principle of mass conservation, neither chemical processes nor physical changes can create or destroy mass in an isolated system. The mass of the products and reactants of a chemical reaction must be equal, in accordance with the law of conservation of mass.
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See full question below
1. Multiple-choice
Q.
Conservation of matter article questions
Law of conservation of mass states that
answer choices
matter is created
matter is destroyed
matter is neither created nor destroyed
matter does not change
what is the energy of light having a frequency of (1.68x10^14)?
Answer:
1.11 x 10⁻¹⁹ J
Explanation:
To calculate the energy of the light, you need to use one of Einstein's equations:
E = hf
In this equation,
-----> E = energy (J)
-----> h = Planck's Constant (6.626 x 10⁻³⁴ J·s)
-----> f = frequency (Hz)
You can plug the constant and given value into the equation and solve for "E". The final answer should have 3 sig figs like the given value.
E = hf <----- Einstein's equation
E = (6.626 x 10⁻³⁴ J·s)(1.68 x 10¹⁴ Hz) <----- Insert values
E = 1.11 x 10⁻¹⁹ J <----- Multiply
Answer options:
electric current
mass
candela
second
Kelvin
amount of a substance
volume
meter
Explanation:
time ➟ second
temperature ➟ Kelvin
ampere ➟ electric current
luminous intensity ➟ candela
mole ➟ amount of a substance
liter ➟ volume
length ➟ meter
Answer:
Explanation:
Kilogramm → mass
Ampere → electric current
Mole → amount of a substance
Liter → volume
5.57 moles of O2 react with H₂ to form H2O. How many moles of H₂ are consumed in
the process?
The number of moles of H₂ consumed in the process is 11.14 moles.
How to calculate number of moles?Stoichiometry is the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions.
The number of moles of a product or reactant can be calculated as follows:
The reaction between oxygen and hydrogen to give water is as follows:
2H₂ + O₂ = 2H₂O
Based on the above equation, 2 moles of hydrogen reacts with 1 mole of oxygen.
Hence, 5.57 moles of oxygen will react with 11.14 moles of hydrogen.
Therefore, 11.14 moles of hydrogen will be produced by 5.57 moles of oxygen.
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Which radioactive sample would contain the greatest remaining mass of the radioactive isotope over 10 years: 2.0 grams of Au-198; 2.0 grams of K-42; 4.0 grams of P-32; or 4.0 grams of Co-60? Why?
The radioactive sample that would contain the greatest remaining mass of the radioactive isotope over 10 years is 4.0 grams of Co-60 because it has the longest half-life.
How does the half-life of an isotope of an element affect the number of particles remaining over a given period of time?The half-life of an isotope of an element is directly related to the number of particles remaining over a given period of time. The longer the half-life of an isotope of an element, the greater the number of particles of that element that remain over a given period of time.
The half-life of the given atoms os given below:
Half-life of Au-198 is 2,607 days
Half-life of K-42 is 12.32 hours
Half-life of P-32 is 14.3 days
Half-life of Co-60 is 5.3 years.
Hence, Co-60 has the longest half-life.
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A 22.46 gram sample of cobalt is heated in the presence of excess bromine. A metal bromide is formed with a mass of 113.8 g. Determine the empirical formula of the metal bromide.
Enter the elements in the order Co, Br
empirical formula =
The empirical formula of the metal bromide, given that 22.46 grams sample of cobalt is heated in the presence of excess bromine is CoBr₃
How do I determine the empirical formula of the metal bromide?We'll begin by obtaining the mass of bromine in the compound. This can be obtained as follow:
Mass of cobalt = 22.46 gramsMass of metal bromide = 113.8 gramsMass of bromine =?Mass of bromine = (Mass of metal bromide) - (Mass of cobalt)
Mass of bromine = 113.8 - 22.46
Mass of bromine = 91.34 grams
Finally, we shall determine the empirical formula of the metal bromide. Details below:
Mass of cobalt (Co) = 22.46 gramsMass of bromine (Br) = 91.34 gramsEmpirical formula =?Divide by their molar mass
Co = 22.46 / 58.9 = 0.381
Br = 91.34 / 79.9 = 1.143
Divide by the smallest
Co = 0.381 / 0.381 = 1
Br = 1.143 / 0.381 = 3
Thus, we can conclude that the empirical formula of the metal bromide is CoBr₃
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Given the following chemical rxn for potassium chloride mixed with sodium hydroxide:
0.25 mol KCl is mixed with 0.25 mol NaOH in a calorimeter, the temperature of
3.33 x 102 g of the solution increases from 27.0°C to 35.5°C. The specific heat of the solution
(water) is 1.00 cal/g°C.
Calculate the quantity of energy (Q= ms x AT, x SH,) evolved in the reaction:
9(A).- AT, =
(show your calculations, print neatly)
9(B).-Q=
(show your calculations, print neatly)
The quantity of heat energy evolved in the reaction, given that 0.25 mole of KCl is mixed with 0.25 mole of NaOH in a calorimeter is 2830.5 calories
How do I determine the quantity of heat evolved?To obtain the heat energy evolved, we shall begin by obtaining change in the temperature of the water. This is obtained as follow:
Initial temperature (T₁) = 27 °CFinal temperature (T₂) = 35.5 °CChange in temperature (ΔT) =?ΔT = T₂ - T₁
ΔT = 35.5 - 27
ΔT = 8.5 °C
Finally, we shall determine the quantity of heat energy evolved in the reaction. Details below
Mass of water (M) = 3.33×10² gChange in temperature (ΔT) = 8.5 °CSpecific heat capacity of solution (C) = 1 Cal/gºC Quantity of heat energy (Q) =?Q = MCΔT
Q = 3.33×10² × 1 × 8.5
Q = 2830.5 calories
Thus, the quantity of heat energy evolved is 2830.5 calories
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A sample of gas with an initial volume of 29.1 Lat
a pressure of 719 mm Hg and a temperature of
306 K is compressed to a volume of 14.1 L and
warmed to a temperature of 372 K.
The pressure is 6.215mmHg
Pressure is force per unit area of surface
Here given data is
Initial volume V₁ = 29.1 L
Initial temprature T₁ = 306 K
Initial pressure P₁ = 719 mm Hg
Final volume V₂ = 4.1 L
Final temprature T₂ = 372 K
Final pressure P₂ = ?
We have to find final pressure = ?
So the formula is
P₁V₁/T₁ = P₂V₂/T₂
719 mm Hg×29.1 L/ 306 K = P₂×4.1 L/372 K
68.37 = P₂×0.011
P₂ = 68.37/0.011
P₂ = 6.215mmHg
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Tricarbon Octasulfide: How many carbons?
* Tricarbon Octasulfide: How many carbons
The Tricarbon Octasulfide: number of carbons is 3.
The tricarbon octasulfide is C₃S₈. The tricabon octasulfide contains three carbons in the molecular formula. carbon is the element with the chemical symbol C is place in the group 14 and the period second in the periodic table. the atomic number of carbon is six. tri carbon is an inorganic compound with the chemical formula C₃ having three carbon atoms. carbon is used as the fuel in the form of coal , methane . carbon is a non metal and the state of carbon is solid state at room temperature.
Thus, The Tricarbon Octasulfide: number of carbons is 3.
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Which two bones make up the jaw?
Explanation:
The lower jaw (mandible), which also shapes the lower face and chin, supports the bottom row of teeth. The bone that moves when the mouth opens and shuts is this one. The upper jaw's (maxilla) function is to support the nose, hold the upper teeth, and shape the middle of the face.
What is the coefficient of H2O when the following equation is properly balanced with the smallest set of whole numbers? ____C2H5OH(l) + ____O2(g) → ____CO2(g) + ____H2O(l)
Answer:
3
Explanation:
at first try balancing the carbon first. At first multiply 2 with CO2, that produces 2 carbon and 8 oxygen. On reactant side we have 3 Oxygen. Now look at Hydrogen. There are 6 hydrogen atoms on the reactant side. So you need to multiply 3 with H20 to be 6 hydrogen atoms as 3*2 = 6.
Final reaction: C2H5OH + 3O2 ------> 2CO2 + 3H2O
Explain, using the terms "energy state" "electrons" and "light" how the colors of a flame test are produced .
The terms "energy state" "electrons" and "light" colors of a flame test are produced is because excitement of electron caused by the increased temprature
The color observed during the flame test result from the excitement of the electron caused by the increased temprature and the electron jumps from their ground state to a higher energy level and as they return to their ground state they emit visible light and the flame test is an analytical procedure used in chemistry to detect the presence of certain element and primarily metal ion and based on each element characteristics emission spectrum the color of flames in general also depend on temprature and oxygen and it sees the different color in the flame
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This element is in Period 3 and Group 16. write the element symbol!!
In Period 3 and Group 16, Sulfur is present and has the element symbol is ''S''.
What is Sulfur and its properties?Sulfur is a chemical element having the symbol S and its atomic number 16 and belongs to group 16. It is abundant around the world and nonmetallic under normal conditions. Sulfur element is used in the vulcanization of black rubber such as a fungicide and black gunpowder. Most element of sulfur is used in the production of acid known as sulfuric acid, which is the most important chemical produced by civilizations of the west.
Element of sulfur is lowly toxic to people but ingesting too much sulfur may cause a burning effect or diarrhea. Breathing in sulfur dust can damage the airways or cause coughing. It can irritate to the skin and eyes of a person.
So we can conclude that Sulfur is the element that is located in Period 3 and Group 16.
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Explain why the arrangement of molecules affect the compressibility of the different states of matter.
How does the arrangement of the molecules differ in each state of matter?
Particles in a: gas is well separated with no regular arrangement. liquid are close together with no regular arrangement. solid are tightly packed, usually in a regular pattern.
How will you differentiate the compressibility of the three phases of matter?
Compressibility: It is the property of matter in which its volume is decreased by applying force.
Fluidity: Matter can flow. Filled a gas container: On filling, a gas takes the shape of the container. Shape: Having definite boundaries.Thus, different states of matter are affected by the arrangement of molecules.
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You have 3.6 moles of C2H4O3 and excess O2. How many moles of O2 are required?
The number of moles of O₂ required to react with 3.6 moles of C₂H₄O₃ is 5.4 moles
How do I determine the mole of O₂ required?First, let us observed the balanced equation, to what we can obtain. This is shown below
2C₂H₄O₃ + 3O₂ -> 4CO₂ + 4H₂O
From the balanced equation above,
2 moles of C₂H₄O₃ reacted with 3 moles of O₂
With the above information from the balanced equation, we can determine the number of moles of O₂ required to react with 3.6 moles of C₂H₄O₃. This can be obtained as follow:
From the balanced equation above,
2 moles of C₂H₄O₃ reacted with 3 moles of O₂
Therefore,
3.6 moles of C₂H₄O₃ will react with = (3.6 × 3) / 2 = 5.4 moles of O₂
Thus, number of mole of O₂ required is 5.4 moles
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Repeat these steps for a Carbon-14 nucleus. Describe the similarities and differences you see.
Explanation:
Explanation:
Nucleons can be either protons or neutrons contained in an atom, and since Carbon-14, has a mass number of 14, it is evident that it contains 14 nucleons, as the mass number of an element is the sum of the protons and neutrons of an element
Between Chlorine and Aluminum which ones electrons would be closer to the nucleus ? Explain your answer.
Answer:Electrons that are closer to the nucleus are in filled orbitals and are called core electrons. Valence electrons are farthest from the positive charge
Explanation:
How many atoms of calcium are present in 83.4 g of calcium?
Answer:
1.25*10^24 atoms with sig figs
Explanation:
To find the number of atoms, an easy way to do this would be to convert the mass to the number of moles, then convert moles to the number of atoms.
There are 40.08 grams of calcium per mole, so 83.4 grams of calcium would have 83.4/40.08 moles of calcium, or about 2.081 moles of calcium
Each mole of something contains about 6.022*10^23 of that something, so 2.081 moles of calcium atoms would equal 2.081 *(6.022*10^23) atoms. 2.081 *(6.022*10^23) equals 1.25*10^24, so there would be 1.25 * 10^24 atoms in 83.4 grams of calcium
Calculate the volume (in milliliters) occupied by a 0.327g sample of CO2 gas at 22.5°C and 755 Torr.
The volume (in milliliters) occupied by a 0.327 g sample of CO₂ gas at 22.5 °C and 755 Torr is 0.115 L.
The ideal gas equation is given as :
P V = n RT
where,
P = pressure = 755 torr = 0.99 atm
V = volume
n = moles
R = gas constant = 0.0821 atm L / mol K
T = temperature = 273 + 22.5 = 295.5 K
mass of CO₂ = 0.327 g
molar mass of CO₂ = 44 g
number of moles of CO₂ = mass / molar mass
= 0.327 / 44
= 0.0047 mol
P V = n R T
V = (n RT) / P
V = ( 0.0047 × 0.0821 × 295.5 ) / 0.99
V = 0.115 L
Thus, The volume (in milliliters) occupied by a 0.327 g sample of CO₂ gas at 22.5 °C and 755 Torr is 0.115 L.
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what is the color of the solution after the endpoint is reached at a ph of 8?
The color of the solution after reaching a pH of 8 is pink.
In the process of titration of acetic acid with aqueous NaOH, phenolphthalein is used as an indicator. Phenolphthalein is nearly colorless in acidic solutions, but it turns the solution into pink at a pH of 8.
As you titrate vinegar, we can observe that the pink color is more persistent as we add more base. When a faint pink color persists for at least 30 seconds, we can understand that the endpoint has been reached.
The pH scale ranges between 0 - 14, if the pH is below 7 it indicates acidic, if it is exactly 7 then it indicates neutral and if it is greater than 7 it indicates a base.
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