Sulfur exists in the form of [tex]S_8[/tex] which occurs as ring structure.
The molecule that represents elemental sulfur in its most prevalent form, a cyclic or ring-like structure made up of eight sulfur atoms, has the chemical formula S8. The S8 ring, which is made up of alternating single and triple covalent connections between the sulfur atoms, is a stable and largely inert structure.
The S8 ring can adopt several conformations since it is sufficiently flexible to rotate thanks to its solitary covalent bond. The S8 ring is a moderately stable molecule that is kept together by van der Waals and covalent forces in both the solid and liquid states. It is a crucial component of numerous minerals and organic compounds found in nature and is employed in a number of commercial and agricultural processes.
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The actual volume of molecules of gas is negligible as compared to the total volume of gas since:
a A large volume is occupied by empty spaces
b A fewer number of molecules are present
c Both A and B
d None of the above
The actual volume of molecules of gas is negligible as compared to the total volume of gas since C. Both A and B.
The Ideal Gas LawThe actual volume of molecules of gas is negligible as compared to the total volume of gas because the majority of the gas is made up of empty spaces. The gas is composed of discrete particles, or molecules, that are separated by a tremendous amount of empty space, and the number of molecules present is incredibly small compared to the total volume of the gas. When a gas is confined to a container, the number of molecules within the container is fixed, and the volume of the container is also fixed. However, the spacing between the molecules is not fixed and can be manipulated. Since the total volume of the container remains the same, but the spacing between the molecules can be changed, the actual volume of molecules present is negligible as compared to the total volume of the gas.This phenomenon is known as the Ideal Gas Law, and it states that the pressure of a confined gas is directly proportional to its temperature and inversely proportional to its volume. The greater the temperature, the more energy the molecules have and, consequently, the closer they are to each other. This means that the actual volume of molecules present is much smaller than the total volume of the gas.Therefore, the actual volume of molecules of gas is negligible as compared to the total volume of gas because the majority of the gas is made up of empty spaces and the number of molecules present is much smaller than the total volume of the gas.
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if the proton would not hit one of the plates, what would be the magnitude of its vertical displacement as it exits the region between the plates?
The magnitude of vertical displacement is 2.73×10−6m as it exits the region between the plates.
The electron narrowly escapes impacting the top plate as it travels between the charged plates and feels an upward pull.
Due to its slower acceleration and higher mass, the proton won't hit any plates.
To calculate the vertical displacement as the object exits the plates, we once more use the kinematic equations.
The electron feels a force upward as it passes between the charged plates and narrowly avoids striking the top plate. It just misses the to plate by a small amount as it moves higher.
The distance it travels in the y-direction is 0.005m.
Time of flight is t=0.0200m1.60×106ms−1 =1.25zz10−8s
the initial y-velocity is zero.
so, 0.005m=12a(1.25×10−8s)2
or, a=6.40×1013ms−2
But also a=Fm= eEme
E= (9.1×10−31kg)(6.40×1013ms−2)1.60×10−19C =364NC−1
The proton will accelerate less and miss the plates since it is more massive. We once more utilise the kinematic equation to determine the vertical displacement when it occurs for the plates.
y=12at2=12eEmp(1.25×10−8s) =2.73×10−6m
The proton won't collide with a plate because, despite the fact that the electric force felt by the proton and electrons is identical, the electric force produces a smaller acceleration that is significantly greater than g, making it plausible to disregard gravity.
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Complete question is:
If the proton would not hit one of the plates, what would be the magnitude of its vertical displacement as it exits the region between the plates?
When a 15. 0 g ring aborb 35. 0 J of heat, it temperature increae by 10 degree celiu. The ring i mot likely made of?
Answer:
Gold in a wedding ring
Explanation:
I think this is the answer. Im sorry if its wrong
How many molecules are in 2. 50 moles of o2?.
There are 1.5055 x10²⁴ molecules in 2. 5 mol of O₂
Multiply the number of moles by the Avogadro constant to get the total number of atoms or molecules in a sample. The equation reads as follows:
number of molecule= moles x avogadro's number
An equal amount of different gases measured at the same pressure and temperature each have the same number of molecules, and one mole of material has 6.022x10²³ atoms.
number of molecule= moles x avogadro's number
number of molecule= 2. 5 mol x 6.022x10²³
number of molecule= 1.5055 x10²⁴
Therefore, there are 1.5055 x10²⁴ molecules in 2. 5 mol of O₂
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how many chlorine atoms are in the compound fe2cl3
There are three chlorine atoms in each FeCl3 molecule. In terms of the total number of atoms in the molecule ferric chloride, there are four. chlorine atoms are in the compound fe2cl3.
Chlorine atoms molecules are made up of two atoms (Cl2). Except for the lighter noble gases, chlorine interacts with practically all elements to form chlorides; those of most metals are ionic crystals, whilst those of semimetals and nonmetals are mostly molecular. Chlorine has an atomic mass of 35.45 and an atomic number of 17, implying that one atom of chlorine has 17 protons, 17 electrons, and 18 neutrons. Chlorine, being a member of the Periodic Table's halogen family, is particularly reactive with metals and creates salts. When the element chlorine (a halogen) obtains an electron or when a molecule such as hydrogen chloride is dissolved in water or other polar solvents, it is produced. Sodium chloride and other chloride salts are frequently extremely soluble.
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The positively charged center in an atom is called as:A. NucleusB. NeutronsC. ProtonsD. Electrons
The positively charged center in an atom is called as Nucleus. It is made up of positively charged protons and neutral sub-atomic particle called as neutrons.
What is meant by protons ?
Every atom has a proton, a subatomic particle, in its nucleus.The particle possesses an electrical charge that is positive and opposite to the electron's.A subatomic particle with a negative charge is an electron. A subatomic particle having a positive charge is called a proton.The strong nuclear force holds protons together in the nucleus of an atom. A particular subatomic particle with no charge is the neutron.Although protons were once thought of as elementary particles, the Standard Model of particle physics now recognizes them as composite particles made up of three valence quarks, and they are grouped alongside neutrons as hadrons.To learn more about protons refer to
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Is C2Cl4 a nonpolar molecule?.
A nonpolar compound is tetrachloroethylene (C2Cl4). Each of the C-Cl bonds in C2Cl4 has a dipole moment, but as the molecule is planar symmetrical, it has no net dipole moment.
Tetrachloroethene, a NON-polar, fully symmetrical molecule similar to C2Cl4, is used to DRY CLEAN clothing because it draws non-polar grease stains that polar water molecules are unable to properly remove. The technique of dry cleaning is NOT at all dry (C₂Cl₄ is a liquid).
Since there is not a significant difference in electronegativity between carbon and hydrogen, the majority of hydrocarbons are non-polar in nature. A covalent link holds the atoms of carbon and hydrogen together. C₂H₄ is non-polar by nature because of this. C₂H₄ is hence non-polar.
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What is a reason WHY Jörg Wiedenmann put corals into warm water in his lab?
Most reef-building corals contain photosynthetic cells, called zooxanthellae, that live in their tissues.
WHY Jörg Wiedenmann put corals into warm water in his lab?
Corals get their food from algae living in their tissues or by capturing and digesting prey. Most reef-building corals have a unique partnership with tiny algae called zooxanthellae. The algae live within the coral polyps, using sunlight to make sugar for energy.Heat stress can lead to the loss of algae that live in symbiosis with corals, resulting in a white appearance (bleaching) and, potentially, the loss of reefs.Not all corals live in warm water – in fact, over half of all known coral species are found in cold, deep, and dark waters. Dense fields of Lophelia pertusa, a common deep-sea reef-building coral, found on the Blake Plateau knolls.To learn more about coral refers to;
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the questiojn is need answere please
The one case that the surroundings do work on the system is q = -17 KJ, w = + 58 kJ. The correct option is A.
What is work done in a system?As work is negative, it indicates that the system is doing the work because when the system works, energy is expended and volume rises.
If the work is constructive, the system is being worked on because it is absorbing energy and its volume is decreasing.
Work = Force Distance is the formula for calculating work. The joule (J), sometimes known as the Newton meter (N m), is the SI unit for work.
Therefore, the correct option is A. q = -17 KJ, w = + 58 kJ.
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a molecule composed of a metal atom and a nonmetal atom
A molecule composed of a metal atom and a nonmetal atom is known to be an 'ionic compound'.
Ionic compounds are usually formed when a metal reacts with a nonmetal. An ionic compound is formed between metal atoms and non-metal atoms, where the atom of metal loses an electron to complete its octet, and the atom of non-metal gains that electron to complete its octet. The resulting ionic compound has a stiff, strong, and frequently crystalline solid bond structure. The most common example of an ionic compound is NaCl (sodium chloride).
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AE=mcAT
AT=(Tr-T)
c=Specific Heat
AE= Heat Energy / Heat Gain or Loss
The specific heat of water is 4.2 J/g°C. If you have 10 g of what how much energy has to be lost to lower the
temperature from 25°C to 10°C?
-49.2 J
O-630 J
1 point
-1,470 J
O-10,500 J
Δt = 25°C - 10°C = 15°C
c = 4.2 J g^-1 °C^-1
m = 10 g
Heat energy required
= mcΔt
= 10×4.2×15
= 630 Joules
if gold’s density is 19.32 g/mL, how much would a 0.0333L sample weigh in grams?
A 0.0333-liter sample of gold would weigh 0.64326 grams.
This is calculated by multiplying the density of gold by the volume of the sample.
the density of gold = 19.32g/ml
the volume of the sample = 0.0333 L
sample weight = the density of gold × the volume of the sample
which is 19.32g/ml × 0.0333 L = 0.64326
In chemistry, density is a measure of the mass of a substance per unit of volume. It is typically represented by the Greek symbol "rho" (ρ) and is typically measured in units of grams per milliliter (g/mL) or grams per cubic centimeter (g/cm^3). A substance's density can be calculated by dividing its mass by its volume.
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.
2. 79.836 g of a compound are analyzed. The compound is composed of 70% of iron and 30%
oxygen. What is the empirical formula of the new compound?
a. Moles of Iron-
b. Moles of Oxygen-
c. Mole ratio-
d. Empirical formula-
e.Molar mass of compound-
The empirical formula of the new compound is:
a. Moles of Iron ⇒ 0.99b. Moles of Oxygen ⇒ 23.9c. Mole ratio ⇒ 2 : 3d. Empirical formula ⇒ Fe₂O₃.e. Molar mass of the compound ⇒ Fe = 55.9 g and O = 23.9 gThe empirical formula is the chemical formula of a compound that shows the type of atom and the simplest ratio of the number of atoms in the compound. The ratio of the moles of atoms is the same as the ratio of their index numbers in the compound.
mass of compound = 79.836 g,
then the mass of Fe = 70% x 79.836 g = 55.9 g
mass of O = 30% x 79.836 g = 23.9 g
nFe : nO = mass Fe/ArFe : mass O/ArO
nFe : nO = 55.9 g/56 : 23.9 g/16
nFe : nO = 0.99 : 1.4
nFe : nO = 1 : 1.5
nFe : nO = 2 : 3
So, the empirical formula of the compound is Fe₂O₃.
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using a ph meter, you find the ph of an unknown solution to be 8.0. how would you describe this solution?
This solution is basic, meaning that it has a pH greater than 7.0. This means that there are more hydroxide (OH-) ions than hydrogen (H+) ions in the solution, creating an alkaline solution.
What is alkaline?Alkaline is a term used to describe a substance with a pH greater than 7. Alkaline substances are considered basic, as opposed to acidic substances which have a pH of less than 7. Baking powder, milk of magnesia, and soap are examples of common alkaline compounds. Alkaline solutions are used in a variety of industries, such as food processing, chemical manufacturing, and pharmaceuticals. Alkaline solutions can be used to neutralize acidic substances, adjust pH levels, and increase the solubility of certain compounds. Additionally, alkaline solutions can be used to remove odors, stains, and grease from surfaces. Alkaline solutions can also be used in water treatment plants to reduce acidity levels and increase the effectiveness of chlorine.
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whats a hypothesis for viscosity
Answer:
Explanation:
A hypothesis for viscosity could be that the viscosity of a fluid is directly proportional to its temperature. This means that as the temperature of a fluid increases, its viscosity will decrease, and as the temperature decreases, its viscosity will increase.
draw the structure of the organic product or products formed in the reaction.
H2C=CH-CH=CH-CH2-Mg-Br + D2O------ H2C=CH-CH=CH-CH2-D + DO- Mg-Br, H2C=CH-CH=CH-CH2-Mg- Br is Grignard reagent , it is highly polar in nature so it is highly reactive.
mecanism
H2C=CH-CH=CH-CH2-Mg- Br is Grignard reagent , it is highly polar in nature so it is highly reactive .
H2C=CH-CH=CH -CH2-Mg-Br------ H2C=CH-CH=CH -CH2- + Mg+-Br
H2C=CH-CH=CH -CH2- that intermediate show resonance so become more product.
H2C=CH-CH=CH -CH2- <-----> H2C=CH-CH--CH=CH2 <-----> -CH2-CH=CH-CH=CH2
So two product possible
D2O----- OD- + D+
product1- H2C=CH-CH=CH2 -CH2- + D+---- .H2C=CH-CH=CH-CH2-D major product
product2- H2C=CH-CH--CH=CH2 + D+----- H2C=CH-CHD-CH=CH2
step-2 Mg+-Br + OD----- DO- Mg-Br
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The complete question is:
draw the structure of the organic product or products formed in the reaction.
What is the formula for velocity Mcq?.
Answer:
The correct formula is v = x/t. Average velocity is total change in displacement divided by total change in time. v = dx/dt is the formula for instantaneous velocity. 3.
Explanation:
(◕ᴗ◕✿)(◕ᴗ◕✿)(◕ᴗ◕✿)
Which is the larger particle. Na (a) or Na+ (b)
The larger particle is Na (a) and not Na+ (b).
What is an atomic particle?All matter consists of atoms that contain a nucleus and orbiting electrons. The nucleus consists of two kinds of atomic particles called protons and neutrons, collectively known as nucleons.
The protons has a mass of 1.67 × 10−27 kg and a positive electronic charge of 1.6 × 10−19 coulombs (C).
So from the question, The atomic number of Na is 10 and electrons' count is also 10. The atomic number of Na+ is 10 and electrons' count is 9.
This means that In Na+, the same effective nuclear charge is acting on less number of electrons compared to Na. so, the attraction will be more.
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how many atoms are contained in 1 mole of hydrogen molecule
The number of atoms contained in 1 mole of the hydrogen molecule is 12.044 x 10^23.
The International System of Units uses the mole as the unit of material quantity. How many elementary entities of a particular substance are present in an object or sample is determined by the quantity of that material. It is specified that the mole contains exactly 6.022 × 10^23 elementary entities.
The molecular formula for hydrogen is H2. So there are two atoms in the molecule of hydrogen. One mole of hydrogen molecule contains 6.022x10^23 hydrogen molecules.
This number 6.022×10^23 is called Avagardo Number. This is a constant value. Since there are two hydrogen atoms in a hydrogen molecule hence, one mole of H2 molecule contains (2 x 6.022 x 10^23 = 12.044 x 10^23) atoms.
Therefore, The number of atoms contained in 1 mole of the hydrogen molecule is 12.044 x 10^23.
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how do silica tetrahedra bond in silicate minerals?
Quartz silica tetrahedra (SiO2) are linked in a "perfect" three-dimensional framework. Each tetrahedron is connected to four other tetrahedra (with one oxygen shared at each corner),
The silicon-to-oxygen ratio is one-to-one. The silicon atom's outer shell includes four electrons. Each of the four electrons in the silica tetrahedra is shared with one of the four oxygen atoms that are linked. In turn, each oxygen atom shares one of the six electrons in its outer shell. Two single chains of silica tetrahedra join together by sharing the third oxygen in alternating tetrahedra to produce an atomic structure. A kind of silicate mineral in which silica tetrahedra are arranged hexagonally. The quartz silica tetrahedra (SiO2) are connected in a "perfect" arrangement. Framework in three dimensions. Each tetrahedron is connected to four other tetrahedra (with one oxygen shared at each corner),
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Help me Please!!!!!!!!
In order to heat 7.40g of water to a higher temperature, 526.35 joules of heat energy are needed.
How is heat energy measured and calculated?Q = m•C•ΔT, Where Q is the amount of heat that is transported to or from the item, m is the object's mass, C is the material's specific heat capacity, and T is the change in temperature that results as a result.
7.40g of water needs 526.35 joules of heat energy to reach the desired temperature.
According to the following formula, the amount of energy is expressed:
The specific heat of water is 4.184 J/g0C and its mass is 7.40 grams.
In the formula, replace the specified parameters with:
In order to heat 7.40g of water to a higher temperature, 526.35 joules of heat energy are needed.
In order to heat 7.40g of water to a higher temperature, 526.35 joules of heat energy are needed.
The complete question is,
The temperature of 7.40g of water must be raised from 29.0 OC to 46.0 OC. Calculate the joules of heat energy needed to do so. 4.184 J/gOC for water's specific heat.
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The 400.0g of water requires 526.35 joules of heat energy.
What is heat energy?The formula,
Q = m•C•T, where Q is the amount of heat transported to or from the item, m is the mass of the object, C is the specific heat capacity of the material, and T is the temperature change as a result.
To reach the desired temperature, 400.0g of water requires 526.35 joules of heat energy.
The amount of energy is expressed using the following formula:
Water has a specific heat of 0.664 J/g0C and a mass of 400.0 grams.
Replace the specified parameters in the formula with:
526.35 joules of heat energy are required to heat 400.0 g of water to a higher temperature.
526.35 joules of heat energy are required to heat 400.0g of water to a higher temperature.
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How much energy do data centers consume?.
According to recent surveys, data centers worldwide consume up to 3 percent of all electrical energy generated worldwide.
Data centers are responsible for a significant portion of the world’s energy consumption. This number is expected to grow as the demand for data storage and compute power continues to increase.
Data centers also need a steady supply of cooling to keep the equipment running efficiently, adding additional strain on the energy grid.
To make the most of this energy, data centers are increasingly turning to renewable energy sources such as solar and wind, as well as cutting-edge technologies such as artificial intelligence and machine learning to reduce consumption.
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chemically, the three layers of the Earth's interior, stated in order from center to surface, are the(1)
The three layers of the Earth's interior, stated in order from center to surface, are the core, mantle and the crust.
What is Earth?
Earth is the planet we live on, one of eight planets in our solar system and the only known place in the universe to support life. Earth is the third planet from the sun, after Mercury and Venus and before Mars. It is about 150 million kilometers (about 93 million miles) from the sun. This distance, called an astronomical unit (AU), is a standard unit of measurement in astronomy. Earth is one AU from the sun.
The planet Jupiter is about 5.2 AU from the sun—about 778 million kilometers (483.5 million miles). Earth is the largest and most massive of the rocky inner planets, although it is dwarfed by the gas giants beyond the Asteroid Belt.
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Hello can someone please help with this it on Construction Notes and Bill Nye. HELP PLEASE
1. A suspension __________________________ is a structure.
2. Tension is the push / pull on an object, for example a rope (circle one).
3. Just about__________________________ is a structure.
4. Structures have form and__________________________.
5. The force of weight in __________________________ and domes is spread out.
6. Bowls, stadiums, and The Capitol are examples of__________________________.
7. Hammers and other tools are / are not structures (circle one).
8. Structures need support / relief to keep them up (circle one).
9. The part of a flag that is in tension is the_________________________.
10. ____________________ bricks make good structures.
The answers are:
A suspension bridge is a structure.Tension is the pull on an object, for example a rope.Just about everything is a structure.Structures have form and function.The force of weight in arches and domes is spread out.Bowls, stadiums, and The Capitol are examples of domes.Hammers and other tools are not structures.Structures need support to keep them up.The part of a flag that is in tension is the rope.Solid bricks make good structures.What are the statements about?A suspension bridge is a type of structure that is supported by cables or chains that are attached to towers. The cables or chains are under tension and the roadway is suspended from them. Suspension bridges are typically used to span large distances, such as over rivers or valleys.
Tension is the pull on an object, for example a rope. It is a force that tries to stretch or elongate an object. In the context of structures, tension is an important factor that engineers need to consider when designing and building structures.
Therefore, Just about everything can be considered a structure if it has a form and serves a purpose. A structure can be a man-made object such as a building, bridge, or dam, or a natural feature such as a mountain or a cave.
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help mi plssneed it now
The molar mass of a material is its mass expressed in grams per mole of the chemical.
What is meant by molar mass?The ratio between a sample's mass and its substance content is known as the molar mass of a chemical compound in chemistry. A substance's molar mass is a bulk attribute rather than a molecular one.
A substance's molar mass is its mass in grams per mole of the chemical. A mole is the measurement of the quantity of atoms, molecules, or ions in a substance.
You may determine the mass of 1 mole of a compound by looking at its molar mass. In other words, it provides the amount of grams in a substance per mole. As a result, molar mass is measured in grams/mole.
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What is the minimum temperature required for pork in hot holding?
Pork must be held in hot holding at a minimum temperature of 135°F.
Between 42°F and 134°F, food is deemed to be in the "Danger Zone". The microorganisms that cause food related disease grow swiftly in food stored in the "Danger Zone" temperature range. Foods that are kept hot must always be kept at 135 degrees or higher.
The recommended storage temperature for hot meals is 135 degrees Fahrenheit or higher. Here are some suggestions for keeping hot meals safe: Never reheat food in a hot holding appliance. Food should be cooked to a safe temperature before being stored. Aseptic canning, also known as high-temperature-short-time (HTST) processing, is the process of filling presterilized containers with a sterile, cooled product and sealing them in a sterile environment with a sterile cover.
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If 2g of zinc granule wa reacted to evolve hydrogen ga which come to completion after 5min. Calculate the rate of reaction in ghr-1
The chemical reaction is occurring at a rate of 25 g/hr.
The pace at which a chemical reaction occurs is known as the reaction rate or rate of reaction. It is proportional to the rise in product concentration per unit time and the fall in reactant concentration per unit time. Reaction times can differ wildly.
The term "rate of reaction" describes how quickly reactants are consumed or how quickly products are produced.
Consequently, the following is the formula for the rate of reaction:
- Time taken/Mass of Reactant Used Up Determines Reaction Rate...
(1)
Reactant mass used up=2g
It took 5 minutes.
The minutes to hours conversion is as follows:
t(hour)=5 min × 1 hour / 60 min equals 0.08 hours
Equation (1) should be changed by substituting the following values:
rate of reaction = 0.2g / 0.08 hours
As a result, the chemical reaction's rate is 25 g/hr.
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Complete Question -
If 2g of zinc granules was reacted with excess dilute HCl to evolve hydrogen gas which came to completion after 5 minutes. Calculate the rate of the chemical reaction in g/hr. Please please please answer quickly
Why do we not just calibrate the gas thermometer at absolute zero? - Waiting for equilibrium at absolute zero would take much more time than is available - Measuring absolute zero requires liquid deuterium for coolant which is expensive - Absolute zero cannot practically be produced in any lab setting - Condensation of water vapor in the lab would raise the temperature
We do not just calibrate the gas thermometer at absolute zero because absolute zero cannot practically produced in o any lab setting.
Reason -
In order to cool a substance to absolute zero (-243-15°C), an unlimited amount of work would be required to remove the heat from it. Therefore, it is essentially impossible to create an environment with an absolute zero temperature.
Because absolute zero cannot effectively be manufactured in any lab setting, we cannot calibrate our thermometer at that temperature due to letter C. Since we cannot create absolute zero,
a thermodynamic system has its lowest energy at absolute zero degrees Celsius. It is equivalent to 459.67 degrees Fahrenheit and 273.15 degrees Celsius, respectively, on the thermometer.
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When magnesium (mg) metal is burned in the presence of oxygen (o2), magnesium oxide (mgo) is produced. The properties of magnesium oxide are different than the individual properties of magnesium and oxygen because magnesium oxide is.
Magnesium oxide (MgO) is created as a Compound when magnesium (Mg) metal is burnt in the presence of oxygen (O2).
Describe a compound.A compound is a chemical that is created when two or more other substances are combined. When substances interact, they generate compounds by forming bonds and joining together. Fixed ratios are used to blend the chemical components.
Magnesium oxide is a chemical that is created when magnesium (metal) and oxygen (O) are united. In this combination, the proportions of magnesium and oxygen are equivalent. These elements' various traits came together to create this compound property.
The total number of atoms in a compound's molecule is indicated by the molecular formula.
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Is dissolving a chemical change or physical change?
Dissolving a substance is considered a physical change.
When a substance dissolves in a solvent, the particles of the substance are dispersed throughout the solvent and become evenly distributed, but the chemical composition of the substance does not change. The dissolved substance retains its chemical properties and can be separated from the solvent by physical means such as evaporation or distillation.
A chemical change, on the other hand, involves a change in the chemical composition or properties of a substance. It typically involves the formation of new substances, the breaking or making of chemical bonds, and the release or absorption of energy. Examples of chemical changes include combustion, rusting, and acid-base neutralization.
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