A student observed a sperm cell using a microscope at magnification of x400 and sperm cell image measured 22 mm long then the actual size is = 55 μm.
What is microscope and magnification?A simple microscope produces an image of the object upon which the microscope is focused whereas magnification is the ability to make small objects seem larger such as making a microscopic organism also visible. Ability to distinguish two objects from each other is called as resolution
As we know that, 1 mm = 1000 μm.
So, 22mm = 22000 μm
Magnification of x400 given
We can calculate, Actual size = image size / magnification.
= 22000/400
Actual size = 55 μm
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which compound has the shortest carbon-carbon bond length? which compound has the shortest carbon-carbon bond length? ch2ch2 ch3ch3 hcch all bond lengths are the same.
Out of all the compounds - ch2ch2 (Ethylene), ch3ch3 (Ethane)and hcch the compound with the shortest bond length is hcch (Ethyne)
Bond length is the equilibrium distance between the nuclei of two groups or atoms that are bonded to each other.
Bond length depends upon bond strength and is inversely proportional to it, therefore longer the length of bond, less the bond strength.
CH3-CH3 is Ethane, the C-C bond is a single bond.
CH2=CH2 is Ethylene, the C-C bond is a double bond.
CHCH is Ethyne, the C-C bond is a triple bond.
As we know, Bond length and bond strength gets shorter and stronger as the number of bonds between the two atoms increases. Here single bond has the largest bond length and triple has the shortest bond length.
So, in order of C-C bond length (longest to shortest) you have ethane > ethylene > ethyne
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what term is commonly used to describe foods that are grown with little or no use of synthetic chemicals?
Organic food is the term that is commonly used to describe foods that are grown with little or no use of synthetic chemicals.
How is organic food grown?Organic food is food grown by farmers and farmers according to organic farming practices.Organic farming practices include using organic pesticides, limiting the use of synthetic products, avoiding irradiation, promoting ecological balance and conserving biodiversity.Organic foods have many advantages because they are nutritious, not contaminated with synthetic chemicals such as growth hormones, and not genetically modified.Organic foods include fresh produce, meats, dairy products, and processed foods such as crackers, beverages, and frozen foods.What is organic farming?Organic farming in India is an agricultural process that uses organic fertilizers and pesticides made from animal or vegetable waste. This agriculture began to respond to environmental problems caused by chemical pesticides and synthetic fertilizers. A new agricultural system that restores, maintains and improves the balance of ecosystems.
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Consider the hydrocarbon with chemical formula C₁0H8; this compound is an...
alkyne.
alkane.
alkene.
aromatic.
Please help :)
C₁OH₈ formula is an alkene hydrocarbon in the nature of its existence.
What are hydrocarbons?
The only two types of atoms that make up all of an organic complex called a hydrocarbon are carbon and hydrogen. The majority of the time, hydrocarbons are colourless gases with hardly detectable odours. Alkanes, alkenes, alkynes, and aromatic hydrocarbons are the four subcategories that are generally used to classify hydrocarbons. These compounds can have relatively simple structures or relatively complex structures.
The study of hydrocarbons can shed light on other functional groups' chemical composition and behaviour. Liquefied petroleum gas, which is derived from hydrocarbons like propane and butane, is also employed as a source of fuel for commercial reasons (LPG). One of the most basic aromatic hydrocarbons, benzene, is used as the starting point for the creation of numeroubrainly.com/question/17578846s synthetic medications.
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:
A. What is Newton's First Law of Motion?
B. Do objects move by themselves? Why or why not?
Answer:
A:
Newton's First Law of Motion is the law of inertia. It states that an object at rest will remain at rest, and an object in motion will remain in motion, unless acted upon by an unbalanced force.
B:
No, objects do not move by themselves. They require a force to move them.
Explanation:
What frequency is a wave with a wavelength of 1km?
The frequency of wavelength of 1km 299792.458 Hz.
These molecules already react to the inward motion of the loudspeaker membrane moving toward the source. Frequency and wavelength are inversely proportional to each other. The wave with the greatest frequency has the shortest wavelength. Twice the frequency means one-half the wavelength. For this reason, the wavelength ratio is the inverse of the frequency ratio.
calculation:-
C= wavelength × frequency
frequency = 3 × 10⁸/ 1000 Hz
= 299792.458 Hz.
= 3 ×10⁵ Hz
Based on such a model, we found that mass is not an intrinsic property of the particle. Instead, mass is basically a measure of particle energy. The relations between energy and mass can be directly derived based on the wave properties of the particle. Waves are one of the ways in which energy may be transferred between stores. Waves can be described as oscillations or vibrations about a resting position.
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The frequency of a wavelength of 1km is
299792.458 Hz.
during step 2 of the reaction aqueous hydrochloric acid was added dropwise to the solution of the intermediate salt, sodium benzoate. we add hydrochloric acid for different reasons. state these two reasons. what would happen if we skipped this step?
Two reasons for dropwise addition of HCl:
To isolate the organic acid from dilute aqueous base solutionTo maintain the overall pH of the system.What is sodium benzoate?Sodium benzoate, the sodium salt of benzoic acid is widely used as a food preservative and pickling agent. It is a white crystalline chemical with the formula C₆H₅COONa. Although used as a food preservative, it is generally recognized as safe and can be used as an antibacterial agent and flavoring agent in food at a maximum usage of 0.1%. It is also generally recognized as safe (GRAS) when used as a preservative in animal feed.
For the specific case of your question:
Addition of concentrated hydrochloric acid protonates the sodium salt of the organic acid to produce the organic acid. Organic acids are not soluble in aqueous solutions, they precipitate in solution and can be collected by filtration.
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What chemical reaction has almost the same products and reactants as cellular respiration but reversed?.
Answer: Rusting Photosynthesis
Explanation: Hope this helps
. an organic compound containing c, h, and o was analyzed by combustion. 6.237 g of the compound yielded 8.845 g carbon dioxide and 5.438 g of water. find the empirical formula of the compound. c
The empirical formula of the compound is CH3O
What is Combustion ?
Combustion is an exothermic, high-temperature redox chemical reaction between a fuel (reductant) and an oxidant (usually oxygen in the atmosphere), producing oxidized, often gaseous, gases in a mixture called smoke. A shaped product is produced. Combustion does not always lead to fire, as the flame is only visible when the substance undergoing combustion is vaporized, but when this occurs, the flame is a characteristic indicator of the reaction. Activation energy must be overcome to initiate combustion (for example, by starting a fire using a lit match), but the heat of the flame provides enough energy to make the reaction self-sustaining can provide.
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Which object will have the smallest change in motion when an equal force is applied?
8 kg circle
6 kg square
4 kg triangle
5 kg rectangle
The object will have the smallest change in motion when an equal force is applied is 8kg circle.
What is force?A force is described as an influence that can change the motion of an object.
A force can cause an object with mass to change its velocity or to change its acceleration. Force can also be described intuitively as a push or a pull. A force has both magnitude and direction, making it a vector quantity.
The object will have the smallest change in motion when an equal force is applied is 8kg circle because according to Newton's second law which states that the rate of change of momentum of an object is directly proportional to the net force acting on it, provided that the mass of the body is kept constant.
This means that as mass increases, force will increase. However, if acceleration is negative, then force will just increase by the same amount in the opposite direction.
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what is the temperature of 0.43 mol of xe gas contained in a 2.65 l container at 3.77 atm? question 7 options:
The temperature of 0.43 mol of xe gas contained in a 2.65 l container is 2.79 K.
An ideal gas is a theoretical gas composed of many randomly transferring factor particles that aren't difficult to interparticle interactions. the best gasoline idea is beneficial because it obeys the precise gas law, a simplified equation of country, and is amenable to evaluation under statistical mechanics.
Volume is a degree of occupied three-dimensional space. it's far more frequently quantified numerically the usage of SI-derived gadgets or by way of diverse imperial gadgets. The definition of length is interrelated with the extent.
An ideal gas is described as one for which both the extent of molecules and forces between the molecules are so small that they have got no effect on the behavior of the gas. The real gas that acts almost like a really perfect gasoline is helium. that is due to the fact helium, in contrast to maximum gases, exists as an unmarried atom, which makes the van der Waals dispersion forces as low as viable
Using the ideal gas equation:-
Given;
PV = nRT
T = PV/nR
= 3.77 × 2.65 / 0.43 × 8.314
= 2.79 K
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What is the empirical formula of a compound containing 60. 0% sulfur and 40. 0% oxygen by mass?.
How many moles is 1.2
×
1023 atoms of Ne?
Answer:
the answer would be 7.584*10^23
what is the main safety hazard of tmscl in this lab, and what precautions should you take when handling tmscl?
The main safety hazards of trimethylsilyl chloride (tmscl) in the lab are,
It could cause severe eye burns.
It is harmful if absorbed through the skin. It could cause severe burns.
It may be harmful if swallowed. Causes severe digestive tract burns.
It may be harmful if inhaled. Causes chemical burns to the respiratory tract.
Prolonged or repeated skin contact may cause dermatitis.
Trimethylsilyl chloride, commonly referred to as chlorotrimethylsilane, is a silyl halide (organosilicon chemical) with the formula (CH3)3SiCl. It is also referred to as Me3SiCl or TMSCl. It is a volatile, colorless liquid that is stable when there is no water present. It has many applications in organic chemistry.
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what is the relationship between the concentration of a solution and the amount of transmitted light through the solution?
Relationship between the concentration of a solution and the amount of transmitted light through the solution is directly proportional to the molar concentration of solution
Concentration is the amount solute that has been dissolved in a given amount of solvent or solution and the percentage of light by the colored solution can be detected and converted to absorbance of light and this is directly proportional and the absorbance is directly proportional to the concentration of the substances and the higher the concentration the higher its absorbance and this is because the proportion of light that get absorbed is affected by the number of molecule that it interact with it
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which french chemist noticed that uranium salts could fog photographic plates, even without being exposed to sunlight?
In March 1896 Antione Henri Becquerel (French chemist) discovered that the uranium mixture would introduce radiation even if it was not exposed to an exposed light.
UraniumHenri Becquerel made a chemical compound of the element Uranium (potassium uranyl sulfuric acid crystals) and produced a light glow around it. This compound is then placed on a dry photographic plate wrapped in thin black paper. It turns out that this light causes sensitivity to the dry plate photo
In 1896, Becquerel accidentally discovered radioactivity while observing the phosphorescence of uranium salts, a discovery by Wilhelm Rontgen. X-rays used a cathode-ray tube to produce X-rays. Becquerel wondered whether X-rays could not be produced by exposing ordinary sunlight to non-metallic substances. Coincidentally, Becquerel also discovered for the first time that this new type of radiation would be transmitted by any uranium chemistries. Since the radiation did not depend in any way on the chemical form of the uranium, Becquerel realized that the radioactivity was not of chemical origin, but had to be from the uranium atoms themselves.
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write two uses of echoes
Echo: When a sound wave is created in the air, some of it is reflected back to the listener while some of it is absorbed after hitting a reflector. Echo is the name for this reflected sound.
Utilizations for Echo:
1. Bats use the echolocation method to find their way because they are unable to see with their eyes. Bats can determine whether an object is in front of a sound by listening to how it is reflected. It uses this method when hunting its prey.
2. This method is also employed to determine undersea distance and ocean depth.
3. Estimating the separation between hills and mountains is also helpful.
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Which two steps are in the wrong order for scientific method? Ask a question, make a hypothesis, test hypothesis, draw conclusions, analyze results, communicate results.
Answer:
draw conclusions and analyze results
how do the minerals differ from one another how are they alike?
Minerals are similar as they always have a specific chemical structure throughout the entire mineral and are all solids at normal temperatures while they can be different due to their physical properties.
What is a mineral?Minerals are naturally occurring solid substances. They can be made from a single element (like gold) or from a combination of elements (Sodium and Chlorine). The Earth is made up of thousands of different minerals.
Types of MineralsMinerals are often divided into two groups: silicates and non-silicates. Silicates are minerals that contain silicon and oxygen.
The rest of the minerals are classified into a group called non-silicates.
Some important non-silicate minerals include:
Carbonates - Carbonates contain carbonate (CO3) combined with some other element.Halides - Halides contain a halogen element as the main element. Oxides - Oxides are minerals where the main element is oxygen. Sulfides - Sulfides contain sulfur and one or more metals or semi-metals. Other elements such as copper, gold, diamond, graphite, and sulfur can be classified as a third group of minerals.Characteristics of MineralsSolid - All minerals are solids at normal temperatures on Earth.Natural occurrence - Minerals occur in nature. Inorganic - Minerals don't come from plants, animals, or other living organisms.Fixed chemical structure - Specific minerals will always have the same chemical formula and the same combination of elements. Minerals also are generally formed with a crystal structure.In conclusion, minerals are very similar to each other but also differ in their physical properties even if they all exist in the form of crystals.
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what mass of silver chloride can be produced from 1.11 l of a 0.156 m solution of silver nitrate? express your answer with the appropriate units.
The mass of silver chloride produced is 24.79g.
Given,
volume = 1.11 L
Molarity = 0.156 M
First, convert molarity to moles by multiplying by the volume:
0.156 M AgNO3 = (0.156 moles AgNO3)/1 L x 1.11 L = 0.173 moles AgNO3
We are only interested in AgCl, not AgNO3. We convert moles of silver nitrate to moles of silver chloride using the balanced equation. This is a 1:1 conversion:
0.173 moles AgNO3 x (1 mole AgCl)/(1 mole AgNO3) = 0.173 moles AgCl
To get mass from moles, we multiply by the molar mass:
0.173 moles AgCl x (143.32 g/mol) = 24.79 g AgCl
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What is the reaction for this equation? FeClz +
Na3PO4 →
Fe3(PO4)2
+
NaCl
The balanced chemical equation for the reaction FeCl2 + Na3PO4 -----> Fe3(PO4)2 + NaCl is 3FeCl2 + 2Na3PO4 ------> 6NaCl + Fe3(PO4)2.
What is a balanced chemical equation?
Balanced chemical equation is the equation of a reaction in which both reactant and product sides are equal in the number of atoms or molecules. The total charges on both the sides should be equal.
The given reaction can be made into balanced chemical equation by counting the number of atoms on both the sides. If the atoms of a particular element is less on either sides then multiply the whole molecule by a number which balances the number of atoms on the either sides of the reaction.
Therefore, the balanced chemical equation of FeCl2 + Na3PO4 -----> Fe3(PO4)2 + NaCl can be written as 3FeCl2 + 2Na3PO4 ------> 6NaCl + Fe3(PO4)2.
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Listed in the Item Bank are some important labels for sections of the image below. Match each label to the corresponding area it identifies in the image.
Silicon, Arsenic and Antimony
Can exchange electrons with each other to form ionic compounds
May have no luster
Tin, Calcium and Potassium
Hydrogen, Oxygen and Chlorine
Can be electrical conductors
Comprised of atoms
The corresponding match for each element is as follows:
Silicon, Arsenic, and Antimony - Metalloids
Can exchange electrons with each other to form ionic compounds _ Metals and non-metals
May have no luster - Metalloids and Non-metals
Tin, Calcium, and Potassium - Metals
Hydrogen, Oxygen, and Chlorine - Non-meatals
Can be electrical conductors - Metals and metalloids
Comprised of atoms - all
What are the properties of metals, metalloids and non-metals?The elements can be classified into three;
metalsmetalloids, andnon-metalsEach of these classes of elements has its own unique properties. The properties of the three classes of elements include the following:
Metals - metals are hard and mostly solid substances with luster. They are good conductors of heat and electricity. Metals form ionic compounds with non-metals by exchanging their electrons. Examples are calcium, sodium, copper
Metalloids - they are mostly solid substances that are intermediate conductors of heat and electricity. They may have no luster. Examples are Silicon, Arsenic, and Antimony.
Non-metals - non-metals are soft and mostly gaseous substances with no luster. They are poor conductors of heat and electricity. Non-metals form ionic compounds with metals by exchanging their electrons.
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what is the solubility of ca(oh)2 (s) in water, given that the ksp is 6.5 x 10-6. molar mass of ca(oh)2 is 74.09 g/mol. g
8.7M Is the solubility of Ca(oh)2 in water at a given Ksp of 6.5 .10-6 and molar mass of 74.09g/mol.
Solubility is defined as the amount of the substance dissolved in a given amount of solvent at a certain temperature.
Ca(OH)2 à Ca2+ + 2OH-
Ksp = 6.5 .10-6
Molar mass= 74.09 g/mol
Ksp is solubility product constant which describes the equilibrium between a solid and its ion in solution.
Ksp=[Ca2+] [OH2-]
6.5 .10-6 = S. (74.09g/mol +S)
6.5 .10-6 = S .( 74.09M)
S = 6.5 .10-6 /74.09 M
= 8.7 M
So, the solubility of Ca(OH)2 is 8.7M.
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The dosage for penicillin for infants is 7.2mg per kg of body weight. Determine the dosage in grams. Please help!!
If you take 0.0072 grams, you should Penicillin dose for newborns is 7.2 mg per kilogram of body weight.
Why would someone use penicillin?Infections brought on by bacteria are treated with penicillins. By eradicating the germs or stopping their growth, they function. Penicillins are available in numerous varieties. Different infections are treated with each differently.
Does penicillin work on any bacteria?To treat staphylococcal and streptococcal bacterial infections, penicillin is a common antibiotic that is administered. Penicillin is a member of the antibiotic class known as beta-lactams, whose members all work by preventing the growth of bacterial cells, which eventually results in bacterial eradication.
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describe the relationship between the colors that we see with our eyes and the colors of light that the dye molecules absorb most strongly
The relationship between the colors that we see with our eyes and the colors of light that the dye molecules absorb most strongly is because of its wavelength
When a molecule interact with light and energy is absorbed and the molecule is said to be excited and the transition occurs which take the molecule from an initial state to a higher energy state and if wavelength of light from a certain region of the spectrum are absorbed by a material then the material will appear to be the complementary color and if violet light with wavelength of 400nm is absorbed then the material will look yellow and if the material absorbs blue then the orange color are seen
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how long did your addition of the acid mixture take? how much ethanol did you use for the recrystallization? what did your nitroacetanilide crystals look like? how long did you dry the final solid before taking the mass and melting point?
Recrystallization ; 25 mL of solvent are needed at 100 oC to dissolve 100 mg of the chemical. 75 mg of the chemical will precipitate at 0 oC while 25 mg will remain in solution.
what did your nitroacetanilide crystals look like? how long did you dry the final solid before taking the mass and melting point?The chemical compound para nitroacetanilide, commonly known as 4-nitroacetanilide, is a nitroacetanilide derivative made from acetanilide and a nitrating combination. A trace of ortho product also forms along with the para product.
Through nitration, the chemical molecule p-nitroacetanilide is created from acetanilide. P-nitroacetanilide is created when acetanilide is treated with a nitrating mixture, which is a combination of nitric acid and sulfuric acid. O-nitroacetanilide is also generated as a small byproduct along with p-nitroacetanilide. It is quite simple to separate p-nitroacetanilide through crystallization since o-nitroacetanilide is highly soluble in alcohol.
Because ethanol is endlessly cosoluble with water and has high dissolving properties for many organics, ethanol and water mixtures are frequently utilized. Many organic compounds' solubilities can be drastically and quickly decreased by the addition of water, which can cause crystallization.
The solution may become too diluted for crystals to form if you add too much solvent. The flask needs to be gently cooled, first at room temperature and then in cold water. Impurities will be captured by a hastily formed crystal's lattice. Smaller crystals will be produced as a result.
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1. A sample of a pure substance has a mass of 18 g and a volume of 2 cm) Find the density of
the sample.
an atom of hydrogen consists of an electron of mass in circular orbit at uniform speed v. the orbital radius is
An electron of mass travelling in a circular orbit with a constant speed of v makes up a hydrogen atom. The orbital radius is 5*10^- 11 meters. The lepton particle family's first generation includes electrons.
In a hydrogen atom, the electron orbits the nucleus in a circle with a radius of 5*10^- 11 metres. It lasts for 1.5*10^16 seconds. The electron motion is accompanied by a current (electromagnetic charge: 1.6*10^19 C).
The electron is a subatomic particle with the symbol e or and an electric charge of one elementarily negative charge of hydrogen atom. Because they are thought to be elementary particles and do not have any known components or substructure, electrons are part of the first generation of the lepton particle family.
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Plant and animal cells are very similar, but they also contain certain differences. how are plant and animal cells different? choose three correct answers.
The plants and animal cells are different because:
-Vacuoles are much larger in plant cells than in animal cells because they hold more water to stay upright
-Plant cells have cell walls to provide a stronger external structure and animal cells do not.
-Special organelles called chloroplasts are found in plant cells and not in animal cells to allow them to produce their own food.
In the field of biology, cells can be described as the building blocks from which all life forms on Earth are built.
Plant cells have chloroplast through which light energy can be trapped. This light energy is used by plants to make their own food. The animal cells lack chloroplast because they do not make their own food.
Plants cells have the cell wall as the outermost covering whereas animal cells do not have a cell wall. The outermost covering of the animal cells is the cell membrane only.
A plant cell has a single, large vacuole in the middle of the cell that is used for maintaining turgidity and storing water. Animal cells do not have smaller and numerous vacuoles.
Although a part of your question is missing, you might be referring to this question:
Plant and animal cells are very similar, but they also contain certain differences. how are plant and animal cells different? choose three correct answers.
Vacuoles are much larger in plant cells than in animal cells because they hold more water to stay upright
Animal cells contain a nucleus and plant cells do not
Plant cells have cell walls to provide a stronger external structure and animal cells do not.
Plant and animal cells are both completely the same and they have no differences.
Special organelles called chloroplasts are found in plant cells and not in animal cells to allow them to produce their own food.
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if you were asked to design a metal support bracket for a shelf, which of the strengths studied in this lab would you use to determine the design strength? why might you use a safety factor? explain your reasoning.
The safety factor describes how much more robust a system is than is necessary for the load that is intended.
The shape, dimensions, and holes of a metal support bracket determine its strength. Static loading, bracket material Designing a metal support bracket that is strong depends on the metal's thickness and profile. Thus, strength is determined by shape, size, and holes. The bracket's material not only determines its strength, but it also has the ability to withstand rusting. Static loading examines the amount of load the bracket can support before deflection to evaluate the strength. utilising the safety factor .
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The figure below shows a sealed balloon containing helium.
The balloon is squashed so its volume decreases.
No helium enters or leaves the balloon.
What happens to the density of the helium in the balloon?
When a sealed balloon containing Helium is squashed so its volume decreases, and no helium enters or leaves the balloon the density of the Helium in the balloon increases.
What is the explanation for the above?Note that the expression or equation for density is:
Density = Mass/ Volume
But we know that the mass of the Helium Atom is Constant.
Lets assume that is is 1,
Hence,
Density = 1/V
Hence, if V reduces, D increases creating an inverse relationship.
Note that the term density refers to how much space an item or substance occupies (its volume) in proportion to the amount of matter in that thing or substance (its mass). Density may also be defined as the quantity of mass per unit of volume.
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