Answer:
Adhesion and cohesion are both attractive forces which mainly take place in liquids.( THIER SIMILIARITY)
Adhesion is a force of attraction between molecules of different substances while cohesion is a force of attraction between molecules of the same substances. ( THIER DIFFERENCE)
Explanation:
ADHESION AND COHESION:
Adhesion is the property of a substance that allows it bind to other molecules other than itself while cohesion is that property that allows a substance bind to its own molecules. Adhesion and cohesion are both attractive forces that exist between molecules, however, they differ in whether the attraction is to a different molecule or the same molecule. Water is a molecule with excellent adhesive and cohesive properties as it can bind to itself effectively and form bonds with other molecules as well.Therefore;
Adhesion and cohesion are both similar in the sense that they are both attractive forces. Adhesion and cohesion are different in the sense that adhesion involves attraction to unlike molecules while cohesion is attraction to like molecules.Learn more at: https://brainly.com/question/1641876?referrer=searchResults
What is a bifurcation?
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A division into two branchesAny place where one thing divides into two.\(\rule{70mm}{2.2pt}\)\(\sf{\:мѕнαcкεя\: ♪...}\)
How many kilograms of oseltamivir would be needed to treat all the people in a city with a population of 400000 people if each person consumes two oseltamivir capsules a day for 5 days? Express your answer to one significant figures and include the appropriate units.
Oseltamivir, C16H28N2O4, is a drug that is used to treat influenza. The preparation of oseltamivir begins with the extraction of shikimic acid from the seedpods of star anise. From 2.6 g of star anise, 0.13 g of shikimic acid can be obtained and used to produce one capsule containing 75 mg of oseltamivir. The usual adult dosage for treatment of influenza is two capsules of oseltamivir daily for 5 days.
Answer:
300 kg
Explanation:
The number of people in the city, p = 400,000
The number of capsules of oseltamivir each person consumes per day, n = 2 capsules
The number of days each person consumes the oseltamivir capsules, t = 5 days
The mass of oseltamivir in each capsule, m = 75 mg
The mass of oseltamivir needed to treat all the people in the city, M, is given as follows;
M = n·t·m·p
∴ M (in milligrams) = (2 × 5 × 75 × 400,000) mg = 300,000,000 mg
1,000,000 mg = 1 kg
∴ 300,000,000 mg = 300 kg
The mass of oseltamivir needed to treat all the people in the city, M = 300 kg
You dissolve 0.66 g of potassium chloride (KCl) in 700 ml of water.What is the molarity of the solution?(From the periodic table: 1 mol K = 39.10 g; 1 mol Cl = 35.453 g)=Enter the value rounded to three decimal places with no units
Answer
0.009 mol/L
Explanation
Given:
Mass of KCl = 0.66 g
Volume of water = 700 mL = 0.7 L
From the periodic table: 1 mol K = 39.10 g; 1 mol Cl = 35.453 g
What to find:
The molarity of the solution
Step-by-step solution:
The formula to calculate molarity is:
\(\text{Molarity }=\frac{Mole}{Volume\text{ in L}}\)The first step is to calculate the molar mass of KCl
KCl = Mass of 1 mol K + Mass of 1 mol Cl
KCl = 39.10 g + 35.453 g
KCl = 74.553 g
So the molar mass of KCl = 74.553 g/mol
The next step is to determine the number of moles of KCl in 0.66g of KCl:
\(\text{Mole }=\frac{Mass}{Molar\text{ mass}}=\frac{0.66\text{ g}}{74.553\text{ g/mol}}=8.852762464\times10^{-3}mol\)Put the values of mole and volume into the molarity formula above to determine the molarity of the solution:
\(\begin{gathered} \text{Molarity }=\frac{8.852762464\times10^{-3}\text{ mol}}{0.7\text{ L}}=0.00885276molL^{-1} \\ To\text{ thr}ee\text{ decimal places,} \\ \text{Molarity }=0.009\text{ }molL^{-1} \end{gathered}\)The molarity is 0.009 mol/L
The balmer series of lines for the hydrogen atom are found only in the visible region of the spectrum.a. Trueb. False
True. The Balmer series of lines for the hydrogen atom are found only in the visible region of the spectrum.
The Balmer series of lines for the hydrogen atom are found in the visible region of the spectrum because of the specific energy levels that the electrons must be in to emit the visible light that makes up the series [1]. When an electron moves from a higher energy level to a lower energy level, it releases a photon of light with a specific wavelength that is determined by the energy difference between the two levels. This is known as an emission line and the Balmer series is composed of the emission lines that are seen in the visible spectrum.
The Balmer series of lines are the result of electrons transitioning from the n=3 to n=2 energy levels, n=4 to n=2, n=5 to n=2, and n=6 to n=2. Each of these transitions produces a photon of light with a specific wavelength. The exact wavelengths of the Balmer series lines are determined by the Rydberg formula, which uses the atomic mass and the Rydberg constant to calculate the energy levels of the hydrogen atom.
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In your own words, write a definition for the term periodic.
Answer: The definition of periodic is something that is recurring at regular intervals, or happens from time to time. An example of periodic is a person's birthday happening once each year.
hope this helps y❣️
please answer asap!
Which statement about the energy involved in nuclear binding energy is true?
a.It is the name given to the combination of strong and weak nuclear forces.
b.It is the energy that holds atoms together in a molecule.
c.It is the energy that binds the nucleus to the rest of the atom.
d.It is created when particles drift far apart.
It is the name given to the combination of strong and weak nuclear forces.
What is the true statement?We know that the nucleus of the atom is the place that houses the greatest amount of energy. We could obtain the highest energy by ripping open the nucleus of an atom. There is a huge energy that holds the particles in the nucleus together and this called the nuclear binding energy.
This energy must also be required to break the nucleus as is the case in the operation of the atomic bond and in nuclear reactors. The true statement about the nuclear energy is that; It is the name given to the combination of strong and weak nuclear forces.
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How many atoms in 98.2 g of He?
19. Who was the first female astronomer
A.Aristotle
B.En Hedu’Anna
C.Archimedes
D.Plato
Answer: A.En Hedu'Anna
Answer:
En Hedu’Anna!
Explanation:
pH = 10.88
what is the OH-
Answer:
The pH of a solution is defined as the negative logarithm (base 10) of the concentration of hydrogen ions [H+]. The concentration of hydroxide ions [OH-] can be calculated using the equation Kw = [H+][OH-], where Kw is the ion product constant for water, which is equal to 1.0 × 10^-14 at 25°C.
To find the [OH-] of a solution with pH 10.88, we first find the [H+]:
pH = -log[H+]
10.88 = -log[H+]
[H+] = 10^(-10.88) = 1.4 × 10^(-11) M
Now we can calculate the [OH-]:
Kw = [H+][OH-]
1.0 × 10^-14 = (1.4 × 10^-11)[OH-]
[OH-] = (1.0 × 10^-14) / (1.4 × 10^-11) = 7.1 × 10^-4 M
Therefore, the [OH-] of the solution is 7.1 × 10^-4 M.
Explanation:
what element is 1s2 2s22p6 3s23p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f10
The given electronic configuration is that of an element named dysprosium.
What is electronic configuration?Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
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How do you check the correct temperature of food?.
Utilizing a food thermometer is the best way to determine when your food is prepared.
Using food thermometers to analyze Get the greatest flavor out of food by cooking it to a safe temperature, avoiding overcooking, and Safely handle and store food.
You've probably heard that chicken is done when the inside is not pink and that hamburgers are ready when their juices run clear. Well, it can be challenging to evaluate those standards sometimes. Utilizing a food thermometer is the best way to determine when your meal is prepared. You won't be able to be assured that dangerous bacteria have been eliminated from your food until it reaches a specific temperature.
Hence, food thermometer ensure optimum cooking of food.
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2 CO + O2= CO2
balance or not?
Answer:
No, The equation is not balanced
The correct ans is
2CO+O2=2CO2
Answer:
No equation is not balanced.2 CO+O2=2CO2
What is metal ? Where does it coke from ?
Answer:
Most pure metals, like aluminium, silver and copper, come from the Earth's crust. They are found in ores – solid materials called minerals, usually occurring in rock, from which the pure metal has to be extracted. The properties of pure metals can be improved by mixing them with other metals to make alloys.a metal is an element that readily forms positive ions (cations) and has metallic bonds
coke is a strong stimulant made from coca leaves
3.00g of glucose was burned in an excess of oxygen in bomb calorimeter with metal holder ("bomb") heat capacity of 2.21 kJ/oC. And 1.2kg of water where water has a specific heat capacity of 4.184 kJ/kgoC. The temp change upon combustion of glucose and oxygen was 19.0 0C to 25. 50C.Calculate the heat evolved from the combustion of 1.00 mol of glucose.
Answer:
THE HEAT EVOLVED FROM THE COMBUSTION OF 1 MOLE OF GLUCOSE IS - 2819.7 KJ/MOL OR -2.82 * 10^3 KJ/MOL OF HEAT.
Explanation:
Write out the variables given:
Mass of glucose = 3 g
Heat capacity of bomb calorimeter = 2.21 kJ /°C
Mass of water = 1.2 kg
Specific Heat capacity of water = 4.184 kJ/kg °C
Change in temperature = ( 25.50 °C - 19.0 °C ) = 6.5 °C
To calculate the heat evolved from the combustion of 1 mole of glucose, we do the following:
Equation for the reaction:
C6H1206 (s) + 6 02 (g)--------> 6 CO2 (g) + 6 H20 (l)
Calculate the total heat capacity involved in the system:
Heat capacity (Ctotal) = Heat capacity of the bomb calorimeter + heat capacity of water
Ctotal = 2.21 kJ/°C + (1.2 * 4.184 kJ/kg°C)
Ctotal = 7.2308 kJ°C
Next is to calculate the heat absoorbed by the calorimeter and water
Heat = Heat capacity (Ctotal) * change in temperature
Heat = 7.23 kJ/°C * 6.5 °C
Heat = 46.995 kJ
Hence, the amount of heat evolved when 3g of glucose was involved is 46.995 kJ
Since 1 mole of glucose reacts with 6 moles of oxygen to produce 6 moles of carbon dioxide and water respectively, then the amount of heat needed for the combustion of 1 mole of glucose is:
1 mole of glucose = (12 *6 + 1 * 12+ 16 *6) = 180 g/mol
From 3 g of glucose producing 46.995 kJ of heat
180 g of glucose will produce (180 * 46.995 / 3) kJ of heat
= 2819.7 kJ/mol of heat.
In conclusion, from the combustion of 1 mole of glucose, -2819.7 kJ/ mol of heat is evolved, since the heat was evolved or liberated.
g sio2 is a(n) covalent network solid. ki is a(n) -- solid. ti is a(n) -- solid. c6h12o6 is a(n) -- solid.
The kinds of the solids are;
SiO2 - Covalent network solid
C6H12O6 - Covalent solid
KI - Ionic solid
What is a covalent network solid?
A covalent network solid, often referred to as a network covalent solid or just a network solid, is a category of solid material in which the atoms that make up the material are strongly covalently linked to one another, forming an extended three-dimensional network structure.
Covalent network solids are kept together by a dense network of covalent bonds, as opposed to molecular or ionic solids, which are held together by weaker intermolecular forces or ionic interactions, respectively.
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a chemist fills a reaction vessel with aluminum hydroxide solid, aluminum aqueous solution, and hydroxide aqueous solution at a temperature of . under these conditions, calculate the reaction free energy for the following chemical reaction: use the thermodynamic information in the aleks data tab. round your answer to the nearest kilojoule.
the closest kilojoule is 168.12 kJ for G°.
Gibbs Free Energy: What is it?
Gibbs Free Energy, at any moment, is defined as the system's enthalpy less the product of the reaction's entropy and temperature, or:
ΔG° = ΔH° - T.ΔS°
Internal heat that exists in the system is referred to as enthalpy. It is determined by:
H° is equal to H°product - H°reagent.
Enthalpy Formation is used Table:
ΔH°= [3*(-299.9)+(-524.7)] - (-1277) (-1277)
ΔH°= 62,6kJ
The level of disorder in a system is measured by entropy. It's located by:
S = Products - Reagents - S
Calculating:
ΔS°= (-321.7) + 3(-10.8)-0\sΔS°= (-354.1) (-354.1)
J
Therefore, Gibbs Free energy will be as follows: G = H - T.
ΔS°\sΔG° = 62600 - [298.(-354.1)]
ΔG° = 168121.8J
To the closest kJ, please:
ΔG° = 168.12 kJ
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The half-life of Strontium-90 is 28.79 years. If a sample contains 120mg, how many mg will remain after 140 years? mg
Approximately 5.28 mg will remain after 140 years is the answer.
The half-life is the time required for half of the atoms in a sample to decay. The exponential decay formula is used to find the amount remaining after a given amount of time for a radioactive substance. We can use the half-life formula to solve the given problem by using the given information: half-life of Strontium-90 is 28.79 years.
Given information:
Half-life of Strontium-90 = 28.79 years
Initial amount of sample = 120 mg
Time = 140 years
We can use the half-life formula to solve the given problem, which is:
A = A0(1/2)^(t/T)
Where:
A0 = Initial amount of sample A = Amount of sample left after t years
T = Half-life of the substance t = Time passed
Substitute the given values in the formula.
A = 120(1/2)^(140/28.79)
A = 120(1/2)^4.86
A = 120(0.044)
A ≈ 5.28 mg
Therefore, approximately 5.28 mg will remain after 140 years.
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What do you think the scientific question is for the
boiling water experiment
Answer:
Scientific Question: ... I will boil water and add a substance like salt to see if the boiling point increases.
Which of the following is an electrical insulator? and explain why is that the correct answer
a. copper
b. rubber
c. aluminum
d. iron
Answer: yo ngl I honestly dont know sry
Explanation:
Answer:
B.sorry the answer is rubber and copper is an example of conductor
Explain whether the molecular orbitals linked to H+ are more
affected by oxygen or nitrogen when NO-ions react with H+ ions to
form chemical bonds.
(It means HON or HNO)
The molecular orbitals linked to H+ are more affected by nitrogen (N) rather than oxygen (O) when NO- ions react with H+ ions to form chemical bonds, resulting in the formation of HNO.
In the formation of chemical bonds, the reactivity and bonding characteristics are determined by the electronic configuration and orbital interactions of the atoms involved. In the case of NO- reacting with H+, we consider the electronic configurations of oxygen (O) and nitrogen (N) atoms.
Oxygen has six valence electrons and belongs to Group 16 of the periodic table. Its electronic configuration is 1s² 2s² 2p⁴. When forming bonds, oxygen typically accepts two electrons to achieve a stable octet configuration.
Nitrogen has five valence electrons and belongs to Group 15. Its electronic configuration is 1s² 2s² 2p³. Nitrogen typically needs to gain three electrons or share three pairs of electrons to achieve a stable octet configuration.
In the case of NO-, the oxygen atom carries a negative charge (O-), making it more electron-rich than nitrogen.
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What happens to the chemical composition of a substance when it reaches its melting point?.
When a substance reaches its melting point, its chemical composition doesn't change. A sense retains its identity even when it undergoes physical changes like melting or boiling. The melting point of a substance refers to the temperature at which it changes from a solid to a liquid state.
The melting point is a characteristic property of a substance, which is dependent on various factors such as pressure and purity.Generally, as a solid substance is heated, its particles absorb heat energy and vibrate more vigorously. As a result, the attractive forces between the particles weaken, causing the substance to become less rigid and ultimately melt into a liquid.However, the chemical bonds that hold the atoms together within a molecule don't break when a substance melts. For example, when ice melts, it changes from a solid state to a liquid state, but its chemical composition remains the same. Ice is composed of water molecules that are held together by hydrogen bonds, and these bonds don't break when the ice melts into water. In conclusion, the chemical composition of a substance remains the same even when it reaches its melting point.
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Lars is balancing equations with his study group. he is unsure about one equation because each member of the study group came up with a different answer. which is the proper way to balance the equation ca(oh)2 h3po4 → ca3(po4)2 h2o? ca(oh)2 h3po4 → ca3(po4)2 6h2o 3ca(oh)2 2h3po4 → ca3(po4)2 6h2o 3ca(oh)2 2h3po4 → ca3(po4)2 3h2o ca(oh)2 2h3po4 → ca3(po4)2 6h2o
The proper way to balancing the given equation is 3Ca(OH)₂+2H₃PO₄→Ca₃(PO₄)₂ +6H₂O
What is balanced equation?Balanced equations are those reactions in which each atom of reactants and products are present in same quantity on both sides of the equation.
Given chemical reaction is:
Ca(OH)₂ + H₃PO₄ → Ca₃(PO₄)₂ + H₂O
Let we discuss each given reaction to get the perfectly balanced equation:
Ca(OH)₂ + H₃PO₄ → Ca₃(PO₄)₂ + 6H₂OIn the above reaction number of hydrogens, calcium as well as of oxygens are not equal so that it is an unbalanced equation.
3Ca(OH)₂ + 2H₃PO₄ → Ca₃(PO₄)₂ + 6H₂OIn the above equation all atoms are present in equal amount on both sides of the reaction, so that it is a balanced equation.
3Ca(OH)₂ + 2H₃PO₄ → Ca₃(PO₄)₂ + 3H₂OIn the above reaction number of oxygen and hydrogen atoms are not equal so that the given equation is an unbalanced one.
Ca(OH)₂ + 2H₃PO₄ → Ca₃(PO₄)₂ + 6H₂OIn the above freaction all atoms are unequal so that given equation is an unbalanced equation.
Hence balanced equation is 3Ca(OH)₂ + 2H₃PO₄ → Ca₃(PO₄)₂ + 6H₂O.
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The structure shown is an example of what kind of polymer? Question 10 options: A) Polyamine B) Polyester C) Polyalkane D) Nylon
Answer:
Examples of natural condensation polymers include cellulose, starch, and polypeptide chains of proteins. Several synthetic condensation polymers discussed include nylon, kevlar, polyester, Bakelite, Melamine, polycarbonates, polyurethanes, epoxies
Explanation:
The amount of heat needed to raise the temperature of 1 gram of a substance by 1°C describes
A.specific heat.
B.heat.
C,enthalpy.
D.calorimetry.
True or False? If the statement is true, write true.If it is false, write false, and change the sentence to make it true! One mole of any gas, at 1 atm of pressure and 0°C, occupies a volume of 44.0 liters.
False. At 1 atm of pressure and 0°C (273.15 K), one mole of an ideal gas takes up 22.4 litres of space rather than 44.0 litres.
Is 22.4 l equivalent to the volume that one mole of any gas occupies at 0 C and 1 atm pressure?0oC (273.15K) and 1atm of pressure are considered standard temperature and pressure (STP). A mole (6.021023 typical particles) of any gas takes up 22.4L at STP .
What size gas, at one atmosphere of pressure, is one mole?A perfect gas has a volume of 22.41 L/mol at STP. 22.4 L is the least significant and most easily recalled chemical number.
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A refrigeration lubricant made from refined crude oil and used only with cfcs and hcfcs describes _____ lubricants.
A refrigeration lubricant made from refined crude oil and used only with CFCs and HCFCs describes Mineral Oil (MO) lubricants.
What is the role of Mineral Oil?
Due to its capacity to aid in reducing water loss from skin and keeping it moisturized, mineral oil is a highly purified, lightweight ingredient used in baby lotions, cold creams, ointments, and many other cosmetic and personal care products.
It does not clog pores because the highly refined, pure mineral oil used in cosmetic and skincare products is non-comedogenic.
Due to its relatively low likelihood of creating a skin reaction or spoiling in hot, humid regions, mineral oil is a component of products for use on sensitive skin because it is also an inert, stable substance.
It's also crucial to remember that the "crude" mineral oil is not the same as the highly refined, pure mineral oil used in cosmetics and personal care products.
Hence, the correct answer is mineral oil.
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How much pressure would 0. 5 moles of gas exert if it were heated to 293 K and trapped in a 2-liter bottle?
1 atm
6 atm (the right answer but why)
3 atm
12 atm
Answer:
Given
Number of moles = 0.5
Temperature = 293 K
Volume in which gas is trapped = 2 litre
From ideal gas law,
PV = nRT
where R is the universal gas constant, R = 0.08206 L.atm/mol
So putting the value in the ideal gas equation,
P *(2) = (0.5)*(0.08206 )(293)
P = (0.5)*(0.08206 )(293)/(2)
P = 12.02179/2
P = 6.01 atm ≈ 6.0 atm (approx)
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7. Calculate the percent composition of ZnSO4.
% composition = Ar/Mr x 100%
MM (molar mass) ZnSO₄ = 161 g/mol
AM (atomic mass) Zn = 65.38 g/mol
% Zn = 65.38/161 x 100% = 40.6%
AM (atomic mass) S = 32 g/mol
% Zn = 32/161 x 100% = 19.9%
AM (atomic mass) O = 16 g/mol
% Zn = 4.16/161 x 100% = 39.6%
estimate the h-cl bond energy in hcl(g), using tabulated bond energies (linked on toolbar) for the remaining bonds. h-cl bond energy
Estimated H-Cl bond energy: Approximately 431 kJ/mol
The H-Cl bond energy can be estimated by subtracting the sum of the bond energies of the constituent atoms from the bond energy of the HCl molecule. The bond energy values for H-H, Cl-Cl, and H-Cl bonds are required for this calculation.
The H-H bond energy is around 436 kJ/mol, while the Cl-Cl bond energy is approximately 242 kJ/mol. Subtracting these values from the known bond energy of HCl, which is approximately 299 kJ/mol, gives us an estimate of the H-Cl bond energy.
H-Cl bond energy ≈ HCl bond energy - H-H bond energy - Cl-Cl bond energy
≈ 299 kJ/mol - 436 kJ/mol - 242 kJ/mol
≈ -379 kJ/mol
The negative value suggests that this estimate is not accurate. However, this discrepancy arises because bond energies are typically defined as the amount of energy required to break a bond, rather than the energy released when forming a bond. By reversing the sign, we obtain a positive value for the estimated H-Cl bond energy, which is approximately 431 kJ/mol.
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A group of scientists in Alaska notices that not only have atmospheric CO2 levels increased at their sampling site but so too have methane levels. What could account for this increase in methane levels
Answer:
The release of methane from thawed permafrost.
Explanation:
The complete question is
A group of scientists in Alaska notices that not only have atmospheric CO2 levels increased at their sampling site but so too have methane levels. What could account for this increase in methane levels?
- None of the answer options is correct.
- The release of methane from thawed permafrost.
-A decrease in beef production near the researchers' sampling area.
-The melting of permafrost accompanied by the thawing of methane-producing bacteria.
-The failure of rice paddies to be established in Alaska, given its climate.
Permafrost regions like the arctic circle hold a large supply supply of methane in their soils and their seas. Ordinarily, this methane should be gradually released naturally over a long period of time, but the effects of global warming is making these permafrost to thaw at a much faster rate, accelerating the release of methane into the atmosphere. The dark side is that methane is about 80 times more deadly when compared to CO2 in its contribution to the green house effect on earth.