The density of the magnetite sample would be 5.2g/cm^3.
What is Density?A body's density is defined as its mass per unit volume. Density is a measurement that compares the amount of matter (denseness) a body has to its volume. It is the degree of consistency of a body measured by the quantity of mass per unit volume. It is the relationship between the mass of the substance or body and the amount of space it takes up. An object with much matter in a certain volume will have a high density.
Density = mass/volume
From the question;
mass = 42g
volume = 8.1cm^3
Density = 42/8.1
Density = 5.2g/cm^3
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What is the number of atoms per unit cell for each metal? enter a number e. G. 1, 2, 3, 4, 5, 6, etc polonium (the first one - pink) manganese (the second - darker grey) silver (the last one - the lighter grey).
Polonium has a simple cubic cell(1 atom), manganese has a body-centered cube(2 atoms) and Silver is a face-centered cubic cell(4 atoms).
In each of the 3 unit cells of the metals, for every corner of the cell, there is 1/8th volume of the sphere. The total volume of the sphere is given by,
Total volume = 1/8th corner of cube x 8 Total Volume
= 1 sphere or atom
Hence, Polonium has only one atom in its cell whereas Manganese has 2 atoms in its cell, one in the corner and one in the center of the cell.
In the case of silver, apart from the corners in each of the faces, there is one hemisphere in each of the faces. There are 6 such faces in the cell. Therefore the number of atoms in silver is given by,
No of atoms in silver = 6 x 1/2 + 8 x 1/8
No of atoms in silver = 4 atoms in each cell.
In conclusion, it can be said that Polonium has a simple cubic cell, Manganese has a body-centered cube and Silver is a face-centered cubic cell.
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how many moles of a gas of molar mass 18.0 g/mol and rms speed 675 m/s does it take to have a total average translational kinetic energy of 42 kj
The number of gas moles of molar mass 18g is 0.010moles.
Molar Mass is 18g and RMS speed 657 m/s , Kinetic energy is 42kj
The mole is a unit of measurement or the starting point for determining how much of a substance is present in a given sample. The Avogadro's constant, or 1 mole, is a quantity that is equal to 6.022 x 1023 particles. These particles can be of any species, e. g atoms, molecules, electrons, protons, neutrons, etc.The Avogadro's constant, 6.022 x 1023, is actually based on the quantity of atoms in 12g of the carbon-12 isotope. Where 12gm is the molar mass of 12C, or in other words, the mass of 1 mole or 6 point022 x 1023 atoms of the 12C isotope of Carbon.[tex]K.E=mv^2/2[/tex]42000=m(675 x 675)/2
m=84000/675²
=0.1843g
To find number of moles -
[tex]n=m/M[/tex]
n=calculated mass/Molar Mass
=0.010 moles
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nuclear decay occurs according to first-order kinetics. a nuclide decays in 3.40 days from 45.0 g to 12.1 g. what is the rate constant for the nuclide?
The rate constant for the nuclide according to first-order kinetics is 0.3863 per day.
Nuclear Decay in First-Order Kinetics:
m(t) = Me∧(-αt)
where m(t) = mass of nuclide after decay at time t;
M = mass of nuclide before decay;
α = rate constant of decay;
t = time for the decay;
What is first-order kinetics?When a fixed percentage of the drug is excreted per unit of time, this is known as first-order kinetics.
For example, The amount of drug in the body has a direct relationship to the rate of removal. The amount of medication eliminated per unit of time increases with concentration. The medication concentration decreases by 50% for each half-life.
Now,
m(t) = Me∧(-αt)
⇒e∧(αt) = M/m(t)
applying ln on both sides;
αt = ln(m/m(t))
α = (ln(m/m(t))/t)
here t= 3.4 days, M = 45 grams, m(t) = 12.1 grams;
dropping these values in the above equation we get,
α = 0.3863 per day;
The rate constant for the nuclide according to first-order kinetics is 0.3863 per day.
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effective nuclear charge equals to the number of?
Answer:
The effective nuclear charge is the net positive charge experienced by valence electrons.
Explanation:
The effective nuclear charge is the net positive charge experienced by valence electrons.
It can be approximated by the equation: Zeff = Z – S
Zeff = the effective nuclear charge
Z = denotes the number of protons existing in the nucleus
S = average amount of density between the nucleus and the electron.
nuclear decay occurs according to first-order kinetics. scandium-43 decays with a rate constant of 0.178 days–1. after 15.0 days, a sample has a mass of 1.73 g. what was the original mass of the sample?
The sample's initial mass is 25.0 g if first-order kinetics is what nuclear decay is said to follow.
explain nuclear power.Nuclear energy is the force that exists in a protons and neutrons, or core. The atoms that make up everything in the universe are minute building blocks, and energy holds the nucleus of each atom together.
What happens in the event of a bombing of a nuclear power plant?A nuclear facility meltdown or explosion might release a significant amount of radioactive material into the atmosphere. Everyone present at the nuclear site would have most certainly been injured or poisoned in the event of an explosion.
Briefing: The following is the expression for the rate rule for first order kinetics:
Where k = rate constant = 0.178 days, t = 2.303/k * log(a/(a - x))
15 days have passed since the sample began, so t 1
a = the reactant's original or initial amount; a - x = the amount left over after the decay process; 1.73g
After plugging in all the values, we get 15=(2.303/0.178) A/1.73 = 10 * log (a/1.73) log (a/1.73) = 15 * 0.178/2.303 ( 15*0.178/2.303)
a = 1.73 * 10^( 2670/2303)\sa = 1.73 * 10^(1.15935736)\sa = 1.73 * 14.433024871\sa = 24.9691330268
Consequently, a weighs about 25 grams.
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Combustion types of chemical reactions number ?
rapid combustion
spontaneous combustion
explosive combustion
how would you design an experiment to find out if table salt woudl form precipitates with lead (ii) nirtate or silver nitrate
In order to design experiment we should initially know how the chemical will react with each other. When sodium chloride reacts with either of the chemicals following reactions takes place:
An inorganic substance having the chemical formula Pb(NO3)2 is lead(II) nitrate. In contrast to the majority of other lead(II) salts, it frequently appears as a colorless crystal or white powder and is soluble in water. Lead chloride and sodium nitrate precipitate are created when sodium chloride solution is introduced to a lead nitrate solution. Lead chloride precipitate is soluble in hot water but insoluble in cold water. If the initial concentrations of silver nitrate and sodium chloride are both quite high, there is a good possibility that the mixture of aqueous AgNO3 and aqueous NaCl compounds will produce a precipitate that is white in color. Therefore, the reaction between AgNO3 and NaCl is precipitation.
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Who is the atom from the other end of town?
Answer:
The Atom is a superhero character from DC Comics. He is a founding member of the Justice League and possesses the ability to shrink himself to subatomic size. In the comics, he is Ray Palmer, a scientist from Ivy Town.
Explanation:
Limestone forms as ocean water evaporates and leaves calcium carbonate behind, which is then deposited on the ocean floor. what type of rock can be formed in this way?
Sedimentary rocks include limestone. When ocean water evaporates, calcium carbonate is left behind, and this is how it forms.
Limestone is one of the most common types of chemical rocks. Limestone is created in the ocean by calcium and bicarbonate ions that erode from the remains of shells, coral, crustaceans, and mollusks. Wave action gradually disintegrates these structures into calcite and other calcium carbonate-based minerals, which accumulate in ocean water. As they are carried from the deep ocean environment to shallow places like lagoons and tidal pools, these solutes have the potential to precipitate to create sediments rich in calcium carbonate. calcium carbonate can precipitate in lagoons to create ooids, which are spherical nodules that stick together to produce oolitic limestone, or limestone.
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if molecules of hydrogen, nitrogen, oxygen and chlorine have the same kinetic energy which molecule will be moving the fastest?
If molecules of hydrogen, nitrogen, oxygen, and chlorine have the same kinetic energy hydrogen molecule will move the fastest.
Kinetic energy will be defined as:
K.E = 1/2mv2
In the above-mentioned equation:
K.E = kinetic energy
m = mass of gas molecules
v = velocity of gas molecules
Gases with smaller particle sizes tend to be traveling quicker at a given temperature, which means that they have a greater speed. Kinetic energy enables gas particles to move at different rates, and these speeds are determined by the size of the gas particle. Hydrogen gas particles are the smallest and hence move at a faster rate, followed by nitrogen gas particles, oxygen gas particles, and chlorine gas particles.
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what is the edge length of a body-centered cubic unit cell made up of atoms that each has a radius of 178 pm ?
The edge length of a body-centered cubic unit cell made up of atoms of radius 178 pm is 411.074 pm.
The body-centered cubic unit cell is defined as an unit cell that has atoms at each of the eight corners of a cube (like the cubic unit cell) plus one atom present in the center of the cube. Each of the corner of atoms is the corner of another cube so the corner atoms are shared among eight unit cells.
Length of body diagonal = r + 2r + r
= 4r
From the cube, body diagonal = √(3) a
∴ 4r = √(3) a
Where:
a: is the edge length
R: is the radius of each atom = 178 pm
By solving equation the equation for "a" we have:
a = 4r/√(3)
⇒ a = (4 × 178)/√(3)
⇒ a = 411.074 pm
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Which material is the limiting ingredient if you have 2 cans of tomatoes, 2 cups green beans, 2 cups pasta, 8 cans of beans, and 12 cups broth
2 cans diced tomatoes
1 cup green beans
1/2 cup pasta
1 can beans
4 cups broth
Based on the recipe for preparing the food, the limiting ingredient is the 2 cans of tomatoes.
What is the recipe for the food?The recipe for the food is given below:
2 cans diced tomatoes1 cup green beans1/2 cup pasta1 can beans4 cups brothHence, 2 cans of diced tomatoes require 1 cup of green beans, 1/2 cup of pasta, 1 can of beans, and 4 of cups broth.
Hence, after, the 2 cans of diced tomatoes are used up, no more food can be prepared.
A limiting reagent or limiting ingredient is used up when cooking, hence, the 2 cans of tomatoes are the limiting ingredient.
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to a 1 l solution of 0.1 m acetic acid solution, 20 g of sodium acetate is dissolved. what is the ph of the solution
The pH of the given solution would be 4.75.
What do you mean by pH?
pH is a measure of the acidity or alkalinity of a solution, usually expressed on a scale from 0 to 14. A pH of 7 is neutral, with solutions below 7 being acidic and solutions above 7 being alkaline.
The pH of the solution can be calculated using the Henderson-Hasselbalch equation:
pH = pKa + log([salt]/[acid])
Where pKa is the -log of the acid dissociation constant (in this case, 4.75 for acetic acid), [salt] is the molar concentration of the salt (in this case, 0.1 M for sodium acetate), and [acid] is the molar concentration of the acid (in this case, 0.1 M for acetic acid).
Plugging in the values, we get
pH = 4.75 + log(0.1/0.1)
pH = 4.75
Therefore, the pH of the solution is 4.75.
What is an acetic acid solution?
An acetic acid solution is a solution made up of acetic acid and water. Acetic acid, also known as ethanoic acid, is an organic acid which is the main component of vinegar. It has a strong, pungent odor and sour taste, and is used in many household products and industrial applications.
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How many joules are required to change 25.02g of liquid Ethanol that is at a temperature of 289.14K to a gas at 351.5K
The amount of joules required to change 25.02g of liquid Ethanol is 3838.2 J or 3.83kJ.
Given,
mass of the ethanol (m) = 25.02g
heat capacity of the ethanol (c) = 2.46
Conversion of Kelvin to Celsius:
C = K - 273.15
C1 = 289.14 - 273.15 => 15.99 C
C2 = 351.5 - 273.15 => 78.35 C
Formula:
H = mcdT
temperature change (dT) = C2 -C1 => 78.35 - 15.99 => 62.36 C
Substituting the values,
H = 25.02 * 2.46 * 32.36
H = 3838.2 J or 3.83kJ
Therefore, the amount of joules required to change 25.02g of liquid Ethanol is 3838.2 J or 3.83kJ.
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How many grams of CO would be required to generate 635 g CO2? Fe2O3 + 3CO → 2Fe + 3CO2 CO: 28.01 g/mol CO2: 44.01 g/mol [?] g CO₂
3 moles or 84.03 g of CO produces 3 moles of or 132 g of CO₂. Thus, the mass of CO required to produce 635 g of CO₂ is 404.23 g.
What is carbon monoxide?Carbon monoxide is an inorganic gas produced from the covalent bonding of carbon with oxygen. When carbon monoxide reacts with metal oxides it produces carbon dioxide.
From the given balanced reaction, 3 moles of CO produces 3 moles of CO₂.
Molar mass of CO = 28.01 g/mol, 3 moles = (28.01 ×3) 84.03 g
molar mass of CO₂ = 44.01 g/mol , 3 moles = 132 g.
Thus, mass of CO required to produce 635 g of CO₂ is :
= (84.03 × 635 g) /132 g = 404.23 g.
Therefore, the mass of CO required to produce 635 g of CO₂ is 404.23 g.
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1. In the equation CH4 + 2O2 ---> CO2 + 2H20, what is the coefficient in 2H20? How is the coefficient used?
2. In the equation CH4 + 2O2 ---> CO2 + 2H20, how is the coefficient in 2O2 used?
(Need answered Asap Please!! )
1. The coefficient in 2H2O means that there are 2 moles of that compound for every 1 mole of CH4 and CO2. If you had 1 mole of CH4 (and enough O2), you would produce 2 moles of H2O. The coefficients describe the ratio of moles in an equation.
2. It's the same for O2. There are 2 moles of O2 for every 1 mole of CH4. When reacting O2 with CH4, you need 2 moles of O2 (which is important if you need to know how much O2 to react with CH4).
Which characteristics would be present in an air mass that develops over the Caribbean Sea near the equator?
What is the correct formula for the product of the combination reaction between calcium metal and oxygen gas?.
Oxygen and calcium react to generate calcium oxide. The chemical made of calcium and oxygen has the formula CaO. This reaction's chemical formula is 2Ca + O2 2CaO.
What are the eight different kinds of chemical reactions?the eight types of chemical reactions that are most frequently encountered are: decomposition reaction, combination reaction, combustion reaction, single displacement reaction, double displacement reaction, precipitation reaction, and redox reaction.
What four traits do chemical reactions have?The evolution of a gas, precipitate formation, color change, temperature change, and state change are significant aspects.
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If the half-life of a radioactive element is 18 days, what percentage of the original sample would be left after 108 days?.
1.56% of the original sample would be left after 108 days.
What are radioactive element?
The atoms that make up radioactive elements have unstable nuclei, and as a means of achieving stability, they emit atomic radiation. Radioactive atoms are converted into another chemical element through radiation emission, which can either make the element stable or radioactive enough to cause additional decay.
Due to the extra nuclear charge present inside of some atomic nuclei, these unstable elements undergo radioactive decay to generate stable nuclei. These substances are referred to as radioactive substances.
Therefore, 1.56% of the original sample would be left after 108 days.
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Ferum + nitric acid =
What does it equals to ????
Answer:
Ferric Nitrate, Nitric oxide and water
Explanation:
Fe + dil. HNO3 gives iron nitrate along with NO . The resulting compounds would be ferric nitrate, nitric oxide, and water.
I hope this helped
Answer:
Ferric Nitrate, Nitric oxide and Water
Explanation:
Fe (NO3)3 , NO, H20
suppose an unknown compound xy has an x-to-y mass ratio of 4.0. if decomposition of compound xy gives 20.0 grams of x, then how many grams of y must form?
An unknown compound is xy has the x-to-y mass of ratio of 4.0. the decomposition of the compound xy will gives 20.0 grams of x, and then will give grams of y form is 5 g.
given that :
x/y = 4
The decomposition of the compound of xy will produces of x is = 20 g
mass of x = 20 g
therefore, x / y = 4
by cross multiplying given equation we get :
x = 4y
y = x / 4
y = 20 / 4
y = 5 g
Thus, the mass of y will produces is given as follows :
y = 5 g.
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Which of these ions is more abundant in the interior of resting neuron that in the fluid surrounding the neuron?A. Cl-B. Ca++C. Na+D. K+
K+ ions is more abundant in the interior of resting neuron that in the fluid surrounding the neuron.
What is a Neuron?
A neuron is a type of cell that is found in the nervous system and is responsible for sending and receiving electrical signals. Neurons are the basic building blocks of the nervous system and are responsible for processing and transmitting information throughout the body.
In neurons, potassium(K) ions are maintained at high concentrations within the cell while sodium ions are maintained at high concentrations outside of the cell. The cell has potassium and sodium leakage channels, which allow the cations to diffuse down their concentration gradients.
Define Potassium?
Potassium is basically a chemical element with the symbol K and atomic number 19. It is a silvery-white, soft, and ductile metal that is part of the alkali metal group. Potassium is an essential mineral for the body, playing a role in muscle contractions, nerve transmission, and the maintenance of a healthy fluid balance. It is also necessary for building and maintaining strong bones.
Therefore, the correct option is Option D.
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when 0.485 g of compound x is burned completely in a bomb calorimeter containing 3000 g of water, a temperature rise of 0.285°c is observed. what is δu of the reaction for the combustion of compound x? the hardware component of the calorimeter has a heat capacity of 3.81 kj/°c. the specific heat of water is 4.184 j/g·°c. the molar mass of compound x is 56.0 g/mol.
The change in internal energy for a molecule at 56 g/mol is discovered to be -539 kJ/mol.
The internal energy change of a reaction is represented by the symbol U. U = Heat of calorimeter + Heat of solution for a reaction in the bomb calorimeter.
Heat capacity = Heat Temperature
For example, 0.48 g compound U = 3.81 0.285 + 4.184 3000 0.28 g compound U = 4.67 kJ
For a molecule at 56 g/mol
U equals energy/mass/moles/one, where U = 4.67/0.48556 and U = 539 kJ/mol.
Since the reaction causes a temperature increase, the internal energy, or -539kJ/mol, is given a negative sign.
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copper IV sulfide formula
Sulfur and copper combine to form the chemical compound copper (IV) sulphide (Cu2S). Cu2S, a chemical, is present.
What happens when CuSO4 and H2S combine?
When H2S gas is introduced to the blue CuSO4 solution, a black copper sulphide precipitate forms, and the sulphuric acid that was created stays in the solution. An illustration of is the response. a mixture reaction
What takes place when copper and H2S interact?
The surface of the copper rod will show signs of the purple-black copper sulphide product that results from the elemental copper reacting with hydrogen sulphide.
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The pic to the right shows you several organs working together including ur lungs, bronchi and trachea (windpipe) this means this pictures shows you an ?
The lungs, bronchi, and trachea seem to be cross-sectioned in the photo (windpipe). The respiratory system supplies oxygen and removes carbon dioxide, a waste product of cellular activity. The trachea transports air from the nose and mouth to the bronchi, which go to the lungs. The lungs exchange gases with the environment via breathing.
What is the respiratory system?Generally, The picture appears to show a cross-section of the human respiratory system, including the lungs, bronchi, and trachea (windpipe). The respiratory system is responsible for bringing oxygen into the body and removing carbon dioxide, a waste product of cellular metabolism.
The trachea is a tube that carries air from the nose and mouth to the bronchi, which are smaller tubes that branch off from the trachea and lead to the lungs.
The lungs are the primary organs of the respiratory system and are responsible for exchanging gases with the environment through the process of breathing.
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What is the difference between changing a subscript in a chemical formula and changing a coefficient?.
Answer:
The chemical formula changes
In a single displacement reaction between al2s3 and li, what products will form and why?.
The products formed during the single displacement reaction between Al₂S₃ and Li are Li₂S₃ and Al.
What are deplacement reactions?
When a more reactive element pushes a less reactive element out of a compound that also contains the less reactive element, a displacement reaction takes place. The less reactive element has undergone a displacement reaction and is now pure and unmixed.
In the reaction of Al₂S₃ and Li the following is observed:
Li+ Al₂S₃ = Li₂S₃ +Al
Lithium displaces aluminium here.
Hence the products formed during the single displacement reaction between Al₂S₃ and Li are Li₂S₃ and Al.
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The element in group 14, period 3, of the periodic table is classified as a
Answer:
metalloid
Explanation:
Silicon. Silicon (symbol Si) is a group 14 metalloid.
if the co2 level in air rises to 0.700% (by volume), what is its partial pressure if the air pressure is 760 mmhg?
The mole fraction of carbon dioxide in the mixture is
P(CO₂) = 0.00004 × 76mmHg
= 0.304mmHg
The key to this problem is the fact that each component of a gas mixture contributes to the total pressure exerted by the mixture in proportion to the number of molecules in the mixture.
Partial pressures of gases are most often expressed as mole fractions.
P(gas) = χ(gas) × P(mixture)
This is the proportional to the number of molecules.
As you know, 1 mole of a substance is exactly 6.022⋅10²³
molecules of that substance. This is known as the Avogadro number Nₐ.
This means that the number of molecules, say x and Avogadro's number
No. can be used to express the number of moles of a gas.
From a mole = Number of Molecules × Nₐ
Now, the percentage composition of a gas mixture is the number of molecules each gas contributes to 100 molecules of the mixture.
In this case, the air must contain 0.04% carbon dioxide. This means that there are 0.04 CO₂ molecules in 100 air molecules.
For example, the number of moles of carbon dioxide in 100 air molecules is ⁿCO² = 0.04 molecules × Nₐ
= 0.04 Nₐ
This air sample is
n (total) = 100 molecules × Nₐ
= 100⋅Nₐ
This means that the mole fraction of carbon dioxide in the mixture is
P(CO₂) = 0.00004 × 76mmHg
= 0.304mmHg
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Which sentence is true of all Brønsted-Lowry bases?
A. They can donate a hydrogen ion.
B. They can accept a hydrogen ion.
C. They can produce hydronium.
D. They are positively charged.
E. They are negatively charged.
Considering the Brønsted-Lowry theory, the correct answer is option B. a base can accept a hydrogen ion.
Brønsted-Lowry theoryIn the Brønsted-Lowry theory, a proton transfer occurs that requires the presence of a proton donor, that is, an acid, and a base that accepts them. In this way, the acid-base reaction is one in which the acid transfers a proton to a base.
Then, according to the Brønsted-Lowry Theory, a base is a substance capable of accepting protons (H⁺) in solution, and an acid is any species capable of donating a proton (H⁺).
SummaryAccording to the Brønsted-Lowry Theory, a base can accept a hydrogen ion.
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