The world would be dark without sunlight. Animals, vegetation, and people would not exist. Without other life, there wouldn't be any.
There won't be any light from the Moon. Only because sunlight reflects off of the Moon can we see it. The Moon would vanish as the sunlight that was illuminating it did. The numerous other celestial objects in the sky, such planets, that humans can only see because of the Sun's reflected light, would also fall under this category.
Earth would swiftly become much colder without the Sun's warmth. Fortunately, Earth's ability to retain heat means that humans wouldn't immediately freeze. But life would start getting much harder right away.
Although no one can foresee the future with certainty what will happen, scientists believe that within a week or so, the average worldwide surface temperature would fall below 0 degrees Fahrenheit. You've probably endured temperature like these before during the chilly winter months.
The issue is that the temperature would keep progressively dropping. The average surface temperature of the entire planet might fall much below -100° F in just one year! The world's sea's surface layers would have frozen over by then. Although the deep waters below would be kept liquid for hundreds of thousands of years by the frozen upper layers of the oceans, they would finally freeze as Earth headed toward a stable average global surface temperature of roughly -400° F. Any remaining humans would then be exposed to the severe cosmic radiation that comes from space because the atmosphere would likewise have frozen and dropped to Earth by that time.
All photosynthesis on Earth would cease if the Sun's rays were to disappear. All living things that depend on plants for food, including humans, will eventually perish along with all plants. While some resourceful people might be able to live without the Sun for a few days, weeks, or even years, it would eventually become impossible to sustain life on Earth.
Hence, There will be no life on earth because sun is the ultimate source.
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a mg oh 2 solution has a concentration of 4.0*10^-5 m. calculate the molarity of each ion in solution.
Magnesium hydroxide has a limited solubility in water and is a weak base. In 1.8 x 10E-6 M solution, there are two hydroxide ions (OH-) per formula unit, or the following number of hydroxide ions per liter:
2(1.8 x 10E-6) = 3.6 x 10E-6 .
What is Molarity ?
A chemical species' concentration in a solution, specifically the amount of a solute per unit volume of solution, is measured by its molar concentration. The number of moles per liter, denoted by the unit symbol mol/L or mol/dm3 in SI units, is the most often used unit denoting molarity in chemistry.
Molarity is measured in units of M or mol/L. One molar is used to describe a 1 M solution.
The amount of moles of solute per liter of solution is known as molarity (M).
Molarity is defined as moles of solute per liter of solution. The amount of moles of solute per kilogram of solvent is known as molality (m). Molality is defined as moles of solute/kg of solvent.
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assignment: module 7 1. what are the components of a solution? describe those components. 2. water is a polar solvent and hexane is a nonpolar solvent. which solvent would each of the following most likely be soluble in? a. ethanol (c2h5oh) b. octane (c8h18) c. potassium chloride d. hydrogen peroxide (h2o2)
The components of a solution are solute and solvent, such as solute is the substance that is being dissolved, whereas the solvent is the dissolving medium.
What is polar and non polar solvent?Polar solvents dissolve polar solutes and similarly non-polar solvents dissolve non-polar solutes. Water is a polar solvent and it dissolves salts and other polar molecules but not non-polar molecules such as oil.
a) Ethanol is soluble in both water and hexane.
b) benzene, carbon dioxide, and tetrachloromethane will be soluble in octane since these compounds are nonpolar.
c)Solubility of potassium chloride is maximum in water. Potassium chloride is an ionic solid and water is a polar solvent.
d)Hydrogen peroxide is soluble in water which is a polar.
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Consider the following system at equilibrium where , and , at 1150 k: when 0.23 moles of o 2 are added to the equilibrium system at constant temperature: the value of increases decreases remains the same the value of is greater than is equal to is less than the reaction must run in the forward direction to reestablish equilibrium run in the reverse direction to reestablish equilibrium remain in the current position, since it is already at equilibrium the concentration of will increase decrease remain the same
1. Kc value:
C. remains the same.
2. Qc value:
C. remain the same.
3. The reaction is:
B. Qc < Kc, the reaction will move in the forward direction.
4. The concentration of N2 is:
A. increase.
Whilst the awareness of all of the reactants increases extra molecules or ions interact to form new compounds and the fee of reaction increases. while the attention of a reactant decreases, there are fewer of that molecules or ions present, and the rate of reaction decreases. If the concentration of reactants is multiplied, there are more reactant particles moving collectively.
Calculation:-
Removing product will shift the reaction in the direction of product as per Le chatelier Principle
So, Equilibrium moves to product side
Since temperature is not changing Kc would not change.
B)Since we are removing product and Qc = [product]/[recatant]
Value of Qc will decrease and hence Qc will be less than Kc
C)Since Qc < Kc, the reaction will move in forward direction.
D)O2 is product here and reaction is moving towards product.
So, concentration of O2 would increase.
There could be more collisions and so the reaction charge is multiplied. The higher the awareness of reactants, the faster the fee of a response will be. awareness can be improved by means of dissolving an extra solute in a given extent of a solution this will increase the mass of the solute. awareness may be accelerated by means of permitting some of the solvents to evaporate this decreases the extent of the solution.
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Which characteristic allows a gas to be compressed?
OA. Its particles are in constant contact.
OB. Its particles have little energy.
OC. Its particles are spread far apart.
OD. Its particles have no motion.
Because there is so much empty space between the gas particles, most of a gas' volume is made up of compressible gas molecules, Hence option c is correct. i.e, Its particles are spread far apart.
The greater compressible nature of gases compared to liquids or solids is explained by the kinetic-molecular hypothesis. The average distance between the gas molecules at standard pressure and room temperature is roughly 10 times the diameter of the molecules. Gas particles are pushed closer together when a gas is compressed, such as when the diving tank is then being filled.
There are various uses for compressed gases. Patients with damaged lungs are frequently given oxygen in hospitals to help them breathe better. When a patient is having a major procedure, a compressed gas is usually used to give anesthetic.
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the mass spectrum of gaseous cl which contains isotopes of mass numbers 35 and 37, consists of singly-charged peaks corresponding to m/e values of
The mass spectrum of gaseous cl which contains isotopes of mass numbers 35 and 37, consists of singly-charged peaks corresponding to m/e values is 78 m/z
A mass spectrum is simply the m/z ratios of the ion present in a sample plotted against their intensities and each peak in a mass spectrum show a component of unique m/z in the sample and height of the peak cannot the relative abundance of the various components in the sample and there are two molecular ion peak in the mass spectra of compound containing a single chlorine atom and this is because chlorine exist as two isotopes ³⁵Cl and ³⁷Cl and the mass spectrum of 2 chloropropane has peak at m/z is 78 due to molecular ion containing an atom of ³⁵Cl
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3) Why does the Hydrogen (H) become Helium (He) after a decay? (You may have to look at a Periodic Table to determine this).
A series of nuclear events that transform four protons into the helium nucleus, two positrons, and two neutrinos result in the fusion of hydrogen into helium.
What is decay ?Transformation of one element into another, typically with the emission of additional particles and energy.
There are four types decay as follows;
Beta Decay 2 neutrons and 2 protons were lost. Atomic mass decreases by 4, atomic number decreases by 2.
Alpha Decay A proton is created from one neutron. Atomic number increased by 1.
Particle Emission One proton transforms into a neutron.
Beta Decay A nucleus with a high energy output emits energy and stabilizes.
When two nuclei join together to form one atom, fusion processes take place. Two hydrogen atoms are fused together to create helium in the sun's reaction.
Thus, a series of nuclear events that transform four protons into the helium nucleus, two positrons, and two neutrinos result in the fusion of hydrogen into helium.
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Which is the best argument for why CO2 represents a covalent bond?
a
The difference in electronegativity of the two elements is greater than 1.7.
b
The difference in electronegativity of the two elements is less than 1.7.
c
The difference in electronegativity of the two elements is greater than 1.7 but less than 3.0.
d
The difference in electronegativity of the two elements is zero.
Answer:
B.) The difference in electronegativity of the two elements is less than 1.7.
Explanation:
A difference of less than 2 between atoms leads to covalent bond formation. Electronegativity is the ability of an atom to draw bonding electrons when it is bonded.
We know that in covalent bonding, atoms "share" elections. We also know that in ionic bonding, atoms "take" electrons. If the electronegativity was too great then atoms would no longer share electrons, one would just draw the electron to it. The ideal values to covalently bond, in this case, would be below two.
identify the relationship between (2r,4s)-2-bromo-4-chlorohexane and (2s,4r)-4-bromo-2-chlorohexane.
In the identification of configuration if the priority groups are arranged in a clockwise direction then it is R- configuration if it is anticlockwise then it is S- configuration.
All three isomers are based on a hexane chain or a chain of six carbon atoms. However, isomer 1 has a chlorine atom on the first carbon. So for 1-chlorohexidine one of the hydrogen atoms on carbon number 1 can be removed and replaced with a chlorine atom.
Cyclohexane is an alicyclic hydrocarbon containing a ring of 6 carbon atoms and is the cyclic form of hexane used as a raw material in the manufacture of nylon. Hexane is used as a special solvent and as a cleaning agent to extract edible oils from seeds and vegetables. When hexane is added to water it floats to the surface of the water with no noticeable mixing. The reason why hexane and water do not mix is complicated.
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lobal warming during the 21st century is expected to a. slow the thermohaline circulation of the ocean b. speed up the thermohaline circulation of the ocean c. slow the hydrologic cycle d. have no effect on the thermohaline circulation of the ocean
Accelerate the hydrologic cycle while decreasing the ocean's thermohaline circulation. (Choice b)
A hydrologic event is what?A hydrologic disaster is an incident that results in a major loss of life, material, and environmental harm that is brought on by changes to the hydrologic cycle. A shift in a watershed's typical hydrology due to natural or artificial factors is referred to as an adjustment of the hydrologic cycle.
What consequences does hydrology have?Watershed hydrology has a significant impact on the long-term viability of local ecosystems and the availability of water. Land use change & rising temperatures are two of these causes.
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A 20. 0-gram cube of ice at 0. 00°C i dropped into a calorimeter containing 120. Gram of water at 35. 0°C. The ice eventually melted, and the water reached an equilibrium temperature of 18. 1°C. Baed on thi data, what i the heat of fuion, in joule per gram, of water?
The heat of fusion of water is B. 348 J when 20g ice is dropped into the water at 35°C.
The heat of fusion of water is the amount of heat required to melt one gram of ice at 0.00°C. Since the ice melted in this experiment, we know that the heat of fusion must be greater than or equal to the amount of heat lost by the ice.
The heat lost by the ice can be calculated using the following equation:
Q = mc∆T
where Q is the heat lost by the ice, m is the mass of the ice, c is the specific heat capacity of ice, and ∆T is the change in temperature.
Using the values from the experiment, we have:
Q = (20.0 grams)(2.09 J/g°C)(35.0°C - 18.1°C)
Q = 348 J
Hence the correct option is B.
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which characteristic of a substance is considered a chemical property?its boiling pointits reactivityits densityits conductivity
Reactivity is the right response because it is the only research that causes a chemical change.
Definition of densityDensity definition Density is the measurement of how tightly a substance is packed. It has the same definition as the mass per unit volume. Indicator of density: D or Density Formula: The formula is: = m/V and where's the density, m is the organism's mass, & V is its volume.
What different types of density are there?Absolute density & relative density are the two main types of density. The relative density, or specific gravity, of a substance is defined as its density divided by the thicknesses of a reference material. Water is commonly cited as a source of information.
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Question 1 (1 point)
Which of the following statements correctly describes the relationship between the
reactants and the products of a chemical reaction?
The total mass of the reactants must be less than the total mass of the products.
Products and reactants always have the same physical and chemical states.
Products always have a different physical and chemical state than reactants.
The total mass of the reactants must equal the total mass of the products.
Answer: The total mass of the reactants must equal the total mass of the products.
Explanation: This is because the mass of all reactants is the mass of all products. Remember that escaping gases from products can lessen the mass. But in all, all products have the same mass as the reactants. I hope this helps!
The chemical equation below represents a decomposition reaction.
2KCIO3(s) → 2KCI(s) + 30₂(g)
What is the total number of moles of KCLO 3(s) needed to produce 6 moles of
O₂(g)?
2
3
4
5
In the above chemical equation, the total number of moles needed to produce 6 moles of oxygen is 4 moles (option C).
How to calculate number of moles?Stoichiometry is the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations).
According to this question, pottasium chlorate undergoes decomposition reaction to form pottasium chloride and oxygen as follows:
2KCIO₃(s) → 2KCI(s) + 30₂(g)
Based on the above equation, 2 moles of potassium chlorate produces 3 moles of oxygen.
This means that 6 moles of oxygen will be produced by 12/3 = 4 moles of potassium chlorate.
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when two objects collide, a force is exerted on each object. the two forces are exerted in __________ directions, but they are the ___________ strength.
PLEASE!!!
When two objects collide, a force is exerted on each object. the two forces are exerted in opposite directions, but they are in different strength.
What is force?Force is defined as the physical strength.
By Newton's first law of motion,
A body moving or in rest remains in motion or in rest until or unless no external force exertes on the body.
By newton second law of motion,
the force is directly proportional to the rate of change of momentum.
Mathematically,
F = ma
When a body collide and move backward or change it's path by exerting some amount of force. The force which is exerted on the body is always opposite due to which they move backward.
Thus, we concluded that when two objects collide, a force is exerted on each object. the two forces are exerted in opposite directions, but they are in different strength.
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Draw the electron dot structures for sulfate (SO4 2-) and carbonate (CO3 2-). Sulfur and carbon are the central atoms, respectively.
The Lewis dot structures of the ions have been shown in the image attached.
What is the electron dot structure?The term electron dot structure has to do with the Lewis structure of the compound or the ion. In this structure, what it can show us is the number of atoms that we can find in the ion as well as the number of electrons that can be shown as dots.
If we take a look at the images that have been attached to this answer, they show the Lewis or the electron dot structures of the ions that have been shown as well as the formal charges that the ions are known to carry.
In this case, we can see that the central atom in the carbonate ion is the carbonate atom while the central atom in the sulfate ion is the sulfur atom.
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which term best describes a chemical process in which the tempature increases
Answer:Chemical reactions that release energy are called exothermic. In exothermic reactions, more energy is released when the bonds are formed in the products than is used to break the bonds in the reactants. Chemical reactions that absorb (or use) energy are called endothermic.
Explanation:
is structure is correct due to the total number of bonds and electrons. this structure is incorrect due to the total number of electrons for the involved atoms. this structure is correct due to allowed exceptions to the octet rule for the involved atoms. this structure is incorrect because the octet rule is not fulfilled for all the atoms.
The octet rule refers to the tendency of atoms to prefer to have eight electrons in the valence shell.
There are three violations to the octet rule are odd-electron molecules, electron-deficient molecules, and expanded valence shell molecules.
The octet rule refers to the tendency of atoms to favor to have eight electrons within the valence shell. while atoms have fewer than eight electrons, they tend to react and form greater solid compounds.
The octet rule refers to an crucial precept that the atoms which have bonded percentage eight outer electrons. This honestly method that the atom's valence shell has a resemblance with a noble gas. The octet rule states that the atoms like to have 8 electrons most effective of their complete outer shells.
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Disclaimer:- Your question is incomplete,please see below for the complete question.
H : Cl
A. This structure is correct due to the total number of bonds and electrons.
B. this structure is incorrect due to the total number of electrons for the involved atoms.
C. this structure is correct due to allowed exceptions to the octet rule for the involved atoms.
D. this structure is incorrect because the octet rule is not fulfilled for all the atoms.
One sentence in the article states, “Our eyes are made of nerve tissue, blood vessel tissue, muscle tissue, lens tissue, pupil tissue, and many more types of tissue to make the organ called eyes.” What fact is this detail supporting?
The sentence our eyes are made of nerve tissue, blood vessel tissue, muscle tissue, lens tissue, pupil tissue, and many more types of tissue to make eyes is supported by the interaction of these structures to form an organ.
What is an organ?An organ is a group of different tissues (such as in the case of eye the muscle tissue and nerve tissue ) which work together to play one or more particular roles.
Therefore, with this data, we can see that an organ is a group of tissues that play particular roles in the body.
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assuming that the drug components whose spots you identified dissolved completely when you stirred the tablet with 1:1 ethanol/dichloromethane, what was the solid that remained behind?
It would be starch or any other pill-coating material that was left.
Why is dichloromethane a good solvent for extraction?
Dichloromethane can dissolve a variety of organic compounds, despite the fact that it is not miscible with water. These characteristics make DCM a very powerful solvent in many industrial processes, along with its volatility.
What is dichloromethane used for?
Dichloromethane is a solvent used in the production of food. In aerosol formulations, it is used. It is a blowing agent for ethane foam. used in the production of pharmaceutical products as a solvent.
Why is dichloromethane not a good solvent?
DCM and other organic solvents are hazardous due to their high volatility. As a result, they can quickly evaporate.
It would be starch or any other pill-coating material that was left.
This is because starch binds the tablet together but is an inactive ingredient that would not dissolve in the solvent.
Thus, the solid remained behind starch or any pill-coating substances.
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The heat of vaporization AHv, of ammonia (NH3) is 23.4 kJ/mol. Calculate the change in entropy AS when 23. g of ammonia boils at -33.5 °C.
The change in entropy of ammonia is 132.2 J/K.
Firstly calculating molar entropy by the formula -
∆S = ∆Hv/T, where ∆S is entropy, ∆Hv is heat of vaporization and T is temperature.
∆Hv = 23.4 × 10000
Performing multiplication
∆Hv = 23400 J/mol
T = -33.5 + 273
Performing subtraction
T = 239.5 K
Keep the values in formula to find molar entropy.
Molar ∆S = 23400 ÷ 239.5
Performing division
Molar ∆S = 97.7 J/mol K
∆S = molar ∆S × number of moles
∆S = 97.7 × (23/17)
Performing multiplication and division
∆S = 132.2 J /K
Hence, the entropy is 132.2 J/K.
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a certain substance has a normal boiling point of and a molal boiling point elevation constant . calculate the boiling point of a solution made of of urea dissolved in of . be sure your answer has the correct number of significant digits.
The boiling point of a solution made of 76 g of urea (NH₂)₂CO dissolved in 850 g of X will be 136.5 °C
Normal boiling point (T1) = 134.5 °C
Molal boiling point constant (Kb) = 1.36 °C.Kg.mol⁻¹
Weight of urea = 76 g
weight of X = 850 g or 0.850 Kg
Boiling point (T2) = ?
Calculate the boiling point elevation by using the following equation:
ΔT = Kb × M
M = molality
Calculate the number of moles of urea
number of moles = mass / molar mass
number of moles of urea = 76 g / 60.06 g/mol
number of moles of urea = 1.3 mol
Calculate the molality
molality = moles of solute / mass of solvent (Kg)
molality of urea = 1.3 mol / 0.850 Kg
molality of urea = 1.5 mol/Kg
Now calculate the ΔT
ΔT = 1.36 °C.Kg.mol⁻¹ × 1.5 mol/kg
ΔT = 2.0 °C
Boiling point (T2) will be:
T2 = T1 + ΔT
T2 = 134.5 °C + 2.0 °C
T2 = 136.5 °C
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Yoko and her friends are learning about energy in class. They see a ball sitting on a table. Yoko and her friends have different ideas about the energy of the ball. This is what they said
Who do you most agree with
Yoko: I think the ball has no energy because it is not moving
.Caleb: I think the ball has no energy because no forces are acting on it
Kawasi: I think the ball has energy but less energy than if it was sitting on the ground because it is farther away from Earth’s surface.
Sonia: I think the ball has more energy than if it was sitting on the ground because it is farther away from Earth’s surface
I think the ball has energy but less energy than if it was sitting on the ground because it is farther away from Earth’s surface. Therefore option C is correct.
What is energy ?In order to accomplish labor and to produce heat and light, energy must be transmitted to a body or to a physical systems. Energy is a preserved resource, according to the rule of conservation of energy, energy can only be transformed from one form to another and cannot be generated or destroyed.
Examples of these include, electrical energy, sound energy, chemical energy, nuclear or atomic energy, light energy, heat energy, mechanical energy, gravitational energy, and so on.
Thus, option C is correct.
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1. how many unpaired electrons are in the fluorine atom? this atom is ... a. paramagnetic ... b. diamagnetic fill in the blank 2 ... 2. how many unpaired electrons are in the zinc atom? this atom is ... a. paramagnetic ... b. diamagnetic fill in the blank 4
Number of unpaired electrons present is 1 electron therefore it is paramagnetic in nature. Number of unpaired electrons in zinc is zero therefore it is diamagnetic in nature
The magnetic properties of a compound can be determined from the electronic configuration and the size of the atoms. Because magnetism is generated by the electronic spin. The number of unpaired electrons in a specific compound indicates how magnetic the compound is.
If there are unpaired electrons present in the electronic configuration then the compound is said to be paramagnetic in nature. If the compounds have all paired electrons then the compound is said to be diamagnetic in nature.
In case of Fluorine the atomic number of the atom is 9 so we can see that in the 2p orbital there are 5 electron among which 4 are paired electrons and 1 is unpaired electrons. Hence it is paramagnetic in nature.
Zinc atomic number is 30, and we see that there are no unpaired electrons that are present hence the atom is diamagnetic in nature.
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Distinguish between a covalent bond and an ionic bond
Explanation:
Covalent bonds are formed due to sharing of electrons between two atoms in order to complete their octet, whereas ionic bonds are formed between atoms of metals and non-metals where the metal loses an electron to complete its octet and the non-metal gains that electron to complete its octet.
Learn at brainlyWhat are the 6 basic crystal structures?
Answer:
Isometric, hexagonal, tetragonal, orthorhombic, monoclinic, and triclinic
Explanation:
The 6 basic crystal structures are Isometric, hexagonal, tetragonal, orthorhombic, monoclinic, and triclinic.
What are crystal structures?
Crystal structure is a description of the orderly organisation of atoms, ions, or molecules in a crystalline material in crystallography. Ordered structures produce symmetric patterns that repeat in the principal directions of three-dimensional space in matter due to the intrinsic nature of the constituent particles. The structure's unit cell is basically group of nanoparticles in the substance that makes up this repeating pattern. The unit cell completely mirrors the symmetry and structure of the entire crystal, which is constructed by repetitive translation of the unit cell along its primary axes. The nodes of the Bravais lattice are defined by the translation vectors.
The 6 basic crystal structures are Isometric, hexagonal, tetragonal, orthorhombic, monoclinic, and triclinic.
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What is the change in entropy when 0. 7 m3 of co2 and 0. 3 m3 of n2, each at 1 bar and 25°c, blend to form a gas mixture at the same conditions? assume ideal gases.
change in entropy for CO2 is 83.78 J/[tex]^{o}C[/tex] and for N2 is 121 J/[tex]^{o}C[/tex]
Entropy Change can be defined as the change in the state of disorder or randomness of a thermodynamic system that is associated with the conversion of heat or enthalpy into work. A system with a great degree of disorderliness or randomness has more entropy.
Entropy also describes how much energy is not available to do work. The more disordered a system is higher is the entropy, the less of a system's energy is available to do work.
To calculate the change in entropy;
For CO2:
Moles of CO2 = [tex]10^{5}[/tex] × 0.7 ÷ (R×298) = 234.9/R
ΔS = 234.9 ln (1/0.7) = 83.78
For N2;
Moles of N2 = [tex]10^{5}[/tex] × 0.3 ÷ (R×298) = 100.7/R
ΔS = 100.7 ln (1/0.3) = 121.24
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Why are the noble gases the most stable elements
on the periodic table?
Answer:
They have eight valence electrons, which fill their outer energy level
Explanation:
Noble gases are the least reactive of all elements. This is the most stable arrangement of electrons, so noble gases rarely react with other elements and form compounds.
Answer:
because their valance shell (outermost shell) is completed with the maximum number of electrons
Explanation:
The field of chemistry had incredible advancements in a very short time period, from the mid-1800s to the early 1900s. It was in this time period that the scientific community saw the need for the regulation of the growing number of chemical discoveries. What were the early committees trying to regulate?.
The early committees trying to regulate that how the newly discovered element were named
Before the regulation were applied to the field of chemistry and the element their characteristics and other information related to them were so disorganized that this was causing the progress in the field to slow down so the committees decided to regulate things such as the names of any newly discovered element and any properties it had so that it could be put to use in a more effective way
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liquid hexane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . suppose 40. g of hexane is mixed with 88.6 g of oxygen. calculate the maximum mass of water that could be produced by the chemical reaction. be sure your answer has the correct number of significant digits.
Maximum mass of water produced from the chemical reaction is calculated to be 58.46 gram.
What is chemical reaction?Chemical reaction is a process where one or more substances that is the reactants are converted to one or more different substances that is the products.
2C₆H₁₄ + 19O₂ --> 12CO₂ + 14H₂O
Stoichiometry of hexane to oxygen--> 2:19
number of moles hexane = 40 g / 86.2 g/mol = 0.464 mol
number of moles of oxygen =88.6 g / 32 g/mol = 2.76 mol
If we consider hexane is limiting reactant,
As, 2 moles of hexane reacts with 19 mol of oxygen
therefore, 19/2 x 0.464 = 4.408 mol
As 4.408mol of oxygen is present, which implies O₂ is in excess and therefore hexane is the limiting reactant.
stoichiometry of hexane to water --> 2:14
2 mol of hexane will give 14 mol of water
therefore, 14/2 x 0.464 = 3.248mol
mass of water formed is 3.248 mol x 18.0 g/mol
= 58.46 gram
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In science class, the students planned and conducted an investigation to learn about the density of fresh and salty water. They used two beakers and placed an egg in each. Use the findings to explain how density depends on salinity and apply this idea to elaborate on what type of water rises above the other when a river meets the ocean.
The egg would be found to float on the sea water which is denser but would tend to sink in the fresh water which is less dense.
What is salinity?The term salinity has to do with the amount of salt that is present. A solution is very saline if there is a high concentration of salt in the solution. We know that sea water has a greater density than water. The reason why the density of the sea water is greater than the density of the pure water is that the sea water contains dissolved salts.
Now, we know that given the fact that the sea water is denser than the fresh water, it is easier for an object to sink in the fresh water than it does in the sea water which is denser. This is even observed in ships as there is a greater tendency to remain afloat in sea water than in salt water.
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