One of the regulating services provided by the ecosystem is pollination. Option B.
What are ecosystem services?Ecosystem services are natural processes that are maintained by the ecosystem but which benefit man and mankind.
There are different types of services offered by the ecosystem and that benefit man immensely. These are:
Provisional services: which include food, raw materials, drugs, and so on.Regulating services: including the regulation of important processes such as pollination, decomposition, carbon storage, etc.Cultural service: non-material benefits that man derives from the ecosystem. Such as recreation, music, etc. Supporting services: such as water cycle, nutrient cycle, etc.The ecosystem plays a regulatory role in the pollination of plants for the benefit of mankind. Wind helps to carry pollens from the anther to the stigma of flowers. By doing so, fruits, vegetables, seeds, etc, become available for the use of man.
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Two magnets push away from
each other and do not attract.
What do we know to be true and
what type of force is being
demonstrated?
write 2 or more sentences
When two magnets are repelling each other, the following are true:
They are faced each with similar poles (negative + negative or positive + positive).When two magnets are placed with similar poles, the lines of force are in opposing directions and must repel one another.What are magnets?
A magnet is a substance or item that generates a magnetic field. This magnetic field is invisible, but it is responsible for a magnet's most remarkable property: a force that attracts or repels other ferromagnetic elements such as iron, steel, nickel, cobalt, and so on.
Magnets are classified into three types: perpetual magnets, temporary magnets, and electromagnets. Permanent magnets produce a magnetic field without requiring any external magnetism or electrical power.
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for the titration of 20.00 ml of 0.500 m hcl with 0.500 m naoh: (2.5 pts) a. write the equation for the reaction taking place during the titration: b. calculate the ph before the addition of naoh: c. calculate the ph after the addition of 10.00 ml of 0.500 m naoh: d. calculate the ph after the addition of 20.00 ml of 0.500 m naoh: e. calculate the ph after the addition of 20.20 ml of 0.500 m naoh:
(a) The balanced chemical equation is -
NaoH + Hcl - Nacl + H2O
(b) For the pH before addition of NaoH, we need
pH = log [H+]
= -log [0.5]
=-(-0.3)
=0.3
The pH of the solution before addition of NaoH is 0.3
(c) Mole of NaoH = 0.5 x 10 = 5molar
Mole of Hcl = 0.5 x 20 = 10mili molar
Unreacted moles of Hcl = 10 -5 = 5 moles.
Total volume = 20 +10 = 30 ml
Molarity = 5 moles / 30ml = 0.166
pH = -log (0.166) = 0.77
(d) Moles of NaoH = 20 X 0.5 = 10 milli molar.
Therefore, Hcl consumed = 10 milli mole.
pH of water = [H+] = 10^-7 molar.
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How is the bent geometry related to the trigonal planar geometry?
They are related through the trigonal planar being the electron geometry and bent is the molecular geometry for an element that has two bonds and one lone pair.
What is Geometry?This is referred to as the study of different types of shapes, figures and sizes and is used in various fields such as mathematics, chemistry etc.
In the field of chemistry, there are different types such as trigonal planar and the bent geometry which are related as a result of some shared characteristics which include the following in the subsequent paragraph.
They are related through the trigonal planar being the electron geometry and bent is the molecular geometry for an element that has two bonds and one lone pair and is therefore the correct choice in this scenario.
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Rationalize the order of elution of the two compounds you isolated from the column in this experiment.
Hexane is initially employed as the eluting solvent to remove the bibenzyl. The bibenzyl will be eluted first because the nonpolar molecule is particularly soluble in hexane (a nonpolar solvent) .
What is called a compound?A mixture in chemistry is a material comprised of two or more separate chemical elements mixed together in a certain proportion. Chemical connections that are challenging to break are created when the components interact with one another. These bonds result in the development of atoms sharing or trading electrons.
Is an element a compound?Pure components and compounds can be found in nature. A element is formed up of many elements in a predetermined ratio, as opposed to an element, which is a substance comprised of the same sort of atoms.
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based on a kckck c value of 0.200 and the given data table, what are the equilibrium concentrations of xyxy , xx , and yy , respectively?
The Equilibrium concentrations :
[XY] = 0.268 M
[X] = 0.232 M
[Y] = 0.232 M
Solution:
XY ⇔ X + Y
0.2 + x 0.3-x 0.3 - x
Kc = [X][Y]/[XY]
0.200 = (0.3-x)^2 / 0.2 + x
0.04 + 0.2 x = 0.09 + x^2 - 0.6 x
x^2 - 0.8 x + 0.05 = 0
x = 0.732 or x = 0.0683
Equilibrium concentrations :
[XY] = 0.268 M
[X] = 0.232 M
[Y] = 0.232 M
When both the reactants and products are at concentrations that do not change over time, they are said to be in chemical equilibrium. In this state, the forward reaction rate is equal to the reverse reaction rate. A chemical is said to have equilibrium concentrations when the products and reactants do not change with time.
In other words, chemical equilibrium or equilibrium concentration is the state in which the rate of the forward reaction in a chemical reaction equals the rate of the reverse reaction. Equilibrium is when the rate of the forward reaction equals the rate of the reverse reaction. All extract and product concentrations are constant at equilibrium.
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molecular hydrogen effuses 4.0 times as fast as gas x at the same temperature. what is the molar mass of gas x?
The molar mass of gas x is 2.0g/mol.
Solution:
Molecular hydrogen effuses four times as fast as gas x at the same temperature
Oxygen is diatomic (O2)
Oxygen's molar mass = 32.0 g/mol.
Certain Gas = fast/light and Oxygen = slow/heavy
Set rate expression equal to the molar mass expression
[tex]\frac{4}{1}[/tex] = [tex]\sqrt{\frac{32}{x} }[/tex]
X = 2.0g/mol
Moles do not change with temperature because temperature affects volume, not mass. When a liquid or gas is heated, the molecules move faster, collide and spread. Since the molecules are distributed, they occupy more space. they are less dense. The opposite happens when a liquid or gas cools.
As the kinetic energy of the molecules in the gas increases, an increase in temperature causes the gas to expand, thus increasing in volume. When the same number of gas molecules occupy more volume, the density of air decreases. Volume is simply defined as the amount of space occupied by a three-dimensional solid.
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I do not understand and need help with an explanation please
The heat of combustion for the unknown hydrocarbon when1 mole of an unknown hydrocarbon is burned in a bomb calorimeter and the Calorimeter increases in temperature by 12.19°C is -611.26kJ/mol
What is a bomb calorimeter?A device that is mostly used to measure combustion temperatures. The reaction occurs in a sealed area known as the calorimeter proper, in constant thermal contact with its surroundings (the jacket).
To calculate the heat of combustion we follow the given steps:
Heat released by the combustion =Cp×ΔT=1.929×12.19 kJ=23.51 kJ
Hence, ΔH=−23.51 kJ/g
A unknown hydrocarbon has an empirical formula of CH and a molar mass of 26 g/mol.
So, ΔH combustion=−23.51×26g /mol=−611.26kJ/mol
Hence, ΔH combustion=−15.6×180 kJ/mol=−611.26kJ/mol
ΔH combustion=−611.26kJ/mol
Hence, the heat of combustion for the unknown hydrocarbon when1 mole of an unknown hydrocarbon is burned in a bomb calorimeter and the Calorimeter increases in temperature by 12.19°C is -611.26kJ/mol
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TRUE OR FALSE equilibrium constant (Keq) is the ratio of the mathematical concentration products over reactants.
Answer: True
Explanation: The value of the equilibrium constant indicates whether or not a reaction is favorable. Reactions for which Keq is greater than one are favorable, meaning that the reactants are higher in energy than the products and signifying that energy is released as the reaction proceeds.
how many atoms of sulfur are in 60.0 g of aluminum sulfide, al2s3? molar masses: al: 27.0 g/mol s: 32.1 g/mol
There are [tex]1.77 * 10^{24}[/tex] atoms of sulfur in 60.0 g of aluminum sulfide.
How do you calculate the number of atoms in a gram?
To get the answer in grams, divide the element's relative atomic mass by Avogadro's number. The same method can be used to determine a molecule's mass. Add up all the atomic masses in the chemical formula in this situation and divide by Avogadro's constant.What is the purpose of aluminum sulfide?
Hydrogen sulfide is made with the help of aluminum sulfur. The chemical industry uses it most frequently. It is employed in the production of cathodes. It is used to create structures for nano-networks.To learn more about Aluminum sulfide, follow the link https://brainly.com/question/5390765
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a balloon is partially inflated with 5.00 l of helium at sea level where the atmospheric pressure is 1.00 atm. the balloon ascends to an altitude of 1600 m where the pressure is 0.83 atm. a) what is the volume of the balloon at the higher altitude if the temperature of the helium does not change during the ascent? b) what is the percent increase in volume?
[tex]P 1 V 1 = P 2 V 2[/tex] ..we get [tex]V 2 = 6 . L[/tex] Explanation: [tex]V 2 = P 1 V 1 /P 2[/tex] = [tex]992 X 5.15 /857[/tex] mbar
what is volume and pressure?
Decreasing the volume of a contained gas will increase its pressure, and increasing its volume will decrease its pressure. In fact, if the volume increases by a certain factor, the pressure decreases by the same factor, and vice versa.The relation between volume V pressure P and absolute temperature T of an ideal gas is PV = xT where x is a constant.Boyle found that when the pressure of gas at a constant temperature is increased, the volume of the gas decreases. when the pressure of gas is decreased, the volume increases. this relationship between pressure and volume is called Boyle's law.The equations describing these laws are special cases of the ideal gas law, PV = nRT, where P is the pressure of the gas, V is its volume, n is the number of moles of the gas, T is its kelvin temperature, and R is the ideal (universal) gas constant.Boyle's law is a gas law that states that a gas's pressure and volume are inversely proportional. When the temperature is kept constant, as volume increases, pressure falls and vice versa.The reduction in the volume of the gas means that the molecules are striking the walls more often increasing the pressure, and conversely if the volume increases the distance the molecules must travel to strike the walls increases and they hit the walls less often thus decreasing the pressure.The principal effect of high pressure, observed in all materials, is a reduction in volume and a corresponding shortening of mean interatomic distances.to know more about volume and pressure follow
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boron has two isotopes; boron-10 and boron-11. which is more abundant, given that the atomic mass of boron is 10.81?
Given that boron has an atomic mass of 10.81 amu, which is closer to 11 than 10, boron-11 is more common. This indicates that boron-11 is more prevalent.
What is atomic mass ?The quantity of protons and neutrons in a specific element's nucleus is known as the atomic mass. This number of electrons in an object's nucleus is often indicated by its atomic number. It is an element's typical weight. The mass of the neutrons and protons can be added to determine the isotopes of an atom in an element.
Why do we use atomic mass?The term "atomic mass" refers to the weight of a molecule or atom. To determine the average weight of elements and macromolecules as well as to resolve stoichiometry issues, the number of protons is used.
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How many moles are equal to 4.0 x 1025 atoms of tungsten
The number of moles are equal to 4.0 × 10²⁵ atoms of tungsten is 0.6624 moles.
Mole is the amount of substance that contain the element chemical units present in 12 g of carbon - 12.
given that :
number of present in atoms of tungsten = 4.0 × 10²⁵
1 mole contains = 6.022 × 10²³ atoms
therefore, 4.0 × 10²⁵ atom will contains :
number of moles = 4.0 × 10²⁵ / 6.022 × 10²³
number of moles = 0.6642 moles.
Thus, The number of moles are equal to 4.0 × 10²⁵ atoms of tungsten is 0.6624 moles.
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at 1 atm pressure the heat of sublimation of gallium is 277 kj/mol and the heat of vaporization is 271 kj/mol. how much heat is required to melt 0.500 mol of gallium at 1.00 atm pressure?
At 1 atm pressure the heat of sublimation of gallium is 277 kJ/mol and the heat of vaporization is 271 kJ/mol. heat is required to melt 0.500 mol of gallium at 1.00 atm pressure is 3 kJ.
The data given as follows :
The heat of sublimation of gallium = 277 kJ/mol
The heat of vaporization = 271 kJ/mol
The difference between the heat of sublimation of gallium and the heat of vaporization is given as :
ΔH = heat of sublimation - heat of vaporization
ΔH = 277 kJ/mol - 271 kJ/mol
ΔH = 6 kJ/mol
The heat required = n ΔH
= 0.500 × 6
= 3 kJ
Thus, At 1 atm pressure the heat of sublimation of gallium is 277 kJ/mol and the heat of vaporization is 271 kJ/mol. heat is required to melt 0.500 mol of gallium at 1.00 atm pressure is 3 kJ.
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what is the voilume of a solution that would result by diluting 50.0 mlof 0.101 m naoh to a ocfncentration of 0.0505m
The volume of the solution that would result by diluting 0.1M solution to 0.05M is 100ml.
The molarity of the substance is defined as the number of moles of solute per unit volume of solution in liters.
Hence, if we can write,
Molarity = moles/volume
Moles = molarity x volume
Moles are always constant, so,
initial molarity x initial volume = final molarity x final volume
The initial volume is 50ml and initial molarity is 0.1M, after diluting, the final molarity is 0.05M.
Putting values,
50 x 0.1 = Volume of NaOH after dilution x 0.05
Volume of NaOH after dilution = 100 ml.
So, the volume of the resulting solution after dilution is 100ml.
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determine the volume in ml of a 0.505 m naoh solution required to titrate 40 ml of 0.25 mh2 so4 solution
The volume of required NaOH is 39.6 ml
What is normality?According to the standard definition, normality is expressed as the number of grams or molar equivalents of solute present in one liter of solution. When we say equivalent, this is the number of moles of reactive moieties in the compound.
Base acidity describes the number of ionizable hydroxide groups in the base. NaOH has an ionizable hydroxide group. Hence, the normality of NaOH is 0.5125 N.
For the given case,
N₁V₁ = N₂V₂
Normality = Molarity × Basicity
For H₂SO₄ the basicity is 2
N₂ = 0.25 × 2
= 0.5 N
For NaOH the acidity is 1
N₁ = 0.505 × 1
= 0.505 N
N₁V₁ = N₂V₂
0.505 × V₁ = 0.5 × 40
V₁ = 39.6 ml
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What is the mass in gram of carbon atoms in 4.4g of C3H8 ?
Help ASAP
I'LL MARK BRAINLIEST
Write the balanced neutralization reaction that occurs between h2so4 and koh in aqueous solution. Phases are optional.
The equilibrium equation for the neutralization reaction between H2SO4 and KOH in aqueous solution is
[tex]H_2SO_4 + 2KOH= > K_2SO_4 +H_2O[/tex]
Neutralization is a chemical reaction in which acids and bases react quantitatively with each other. When reacted in water, the neutralization effect works because there is no excess hydrogen or hydroxide ions in the solution.
A neutralization reaction is when an acid and a base react to form a salt with water, and H+ and OH ions mix to form water. Neutralizing strong acids and strong bases results in a pH of 7.
The reaction between an acid and a base is called a neutralization reaction, which can be thought of as a kind of substitution reaction in which the protons of an acid are replaced while being given to another species.
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calculate the theoretical yield of all products when 18.9 grams of lithium phosphate reacts with excess gold (i) acetate
The yield of products formed is:
gold phosphate equals 111.93 grams and the yield of lithium acetate 32.30 grams.
This theoretical yield can be calculated as:
Molar masses of reactants and products that they need. lithium phosphate equals 115.79 grams per mole. Mass of gold phosphate equals 685.87 grams per mole and the molar mass of lithium acetate equals 65.98 grams per mole. Using number of moles and mass of substance produced we can calculate the products formed.
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What is like the mitochondria?
O Excretory system
Digestive system
O Nervous system
O Skeletal System
Answer:
digestive system
.
Explanation:
Chemical bonds contain a form of energy called chemical energy. Forming and breaking chemical bonds during reactions involves changes in energy.
---------------------------------------------------------
Identify if energy is released or absorbed when a chemical bond is broken. Then identify if energy is released or absorbed when a chemical bond is formed.
Explanation:
when a chemical bond is broken, the excess energy that was stored in the bond will be released whereas, for a bond to be formed energy is absorbed.
hope it helps. :)
what is the minimum light-photon energy that can dissociate a hydrogen molecule? express your answer to one significant figure and include the appropriate units.
The lowest energy of a light-photon that may split a hydrogen molecule is 7*10-19J. The energy of a quantum of light is known as a photon. Light is both a wave and a particle, according to its dual nature.
The light-photon or quanta of light are other names for the light particle. The most basic molecule is a hydrogen molecule. Electrostatic forces hold together its two protons and two electrons, which are bound together. The assemblage can exist at various energies, similar to atomic hydrogen. both para- and orthohydrogen. The energy that is equal to the minimum amount of light-photon energy is equal to the bond energy of the hydrogen molecule molecule, according to the energy diagram of hydrogen as a function of atomic separation.
Light photon energy at the minimum is 7*10-19 J.
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A student performed the following steps in an investigation:
1. Add a few drops of red food coloring to 50 mL of water in a beaker.
2. Stir the contents of the beaker using a glass stir rod.
3. Add 20 mL of yellow vegetable oil.
4. Stir the contents of the beaker using a glass stir rod.
5. Leave the beaker undisturbed for 24 hours.
Which of the following statements about the investigation is most accurate?
A The student made a compound out of pure substances and then made a homogeneous mixture.The student made a compound out of pure substances and then made a homogeneous mixture.
B The student made a solution and then a heterogeneous mixture.The student made a solution and then a heterogeneous mixture.
C The student made a homogeneous mixture and then made a pure substance through a chemical reaction.The student made a homogeneous mixture and then made a pure substance through a chemical reaction.
D The student made a heterogenous mixture and then stirred it until it was a homogeneous mixture.The student made a heterogenous mixture and then stirred it until it was a homogeneous mixture.
The statement that is true is that; the student made a solution and then a het---erogeneous mixture.
What is true about the set up?We know that a solution is composed of a substance that dissolves in a solvent. The solution is made when the red coloring is dissolved in the water and then when we add the oil, there is now a layer that is not in phase with the rest of the solution.
The vegetable oil would then tend to separate out of the rest of the solution and then form a het--erogenous mixture. We can be able to have the two of them come together by stirring the mixture for some time.
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what is the ph of a barium hydroxide solution obtained by dissolving 0.10 grams of barium hydroxide in enough water to obtain 250. ml of solution? (mm of ba(oh)2 is 171.3 g/mol)
The pH of a barium hydroxide solution obtained by dissolving 0.10 grams of barium hydroxide in 250ml of water is 17.
When barium hydroxide is dissolved in water, it forms,
Ba(OH)₂ → Ba⁺ + 2OH⁻
the concentration of the hydroxide ion in the solution will be,
Molarity = Moles of solute/volume of solution
Moles of Ba(OH)₂ = 2 moles of OH⁻
So, we can write,
0.10/171.3x2 =Moles of OH⁻
Moles of OH⁻ = 0.000291 moles.
Molarity of OH⁻ solution = 0.000291 x 1000/250
Molarity/concentration of OH⁻ solution = 0.001 mol/L
pH = 14 - p[OH]
p[OH] = log[0.001]
p[OH] = -3
pH = 14+3
pH = 17
So, the pH of the solution is 17.
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why should reflux of the micro-scale reaction be gentle, with the condensation ring remaining close to the surface of the liquid in the test tube?
The reflux of the micro-scale reaction should be gentle because since solvents are present in small quantities, the reaction might dry up and burn.
What is reflux?
Reflux can be analogous to distillation. The condenser is present in reflux. The solvent boils and gets condensed back to the same flask. The equipment for reflux are RB flask, heat source, condenser and a water bath.
In reflux reactions, the micro-scale reactions use very small amount of solvents and reagents as the name suggests. During the reaction some solvent might boil and leave the reaction vessel. Then the solvent molecules condense below. Higher the condensation ring, lesser solvent present in the reaction.
Therefore, during reflux reactions, the reaction might dry up and burn since the solvent condenses and only few molecules of solvent are present in the reaction mixture. So, the reaction needs to be gently done.
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Calculate the potential energy of a statue with a mass of 20 kg while sitting on a table that is 2 m high
Answer:
392.4 J
Explanation:
Potential Energy = m g h = 20 * 9.81 * 2 = 392.4 J
How many atoms thick is graphene?
One atom thick film of carbon known as graphene is 200 times stronger than steel and one hundred times thinner than a sheet of paper.
How thick is a graphene atom?1 atom thick
Pure carbon atoms are arranged in a hexagonal lattice in a single layer to form graphene, which is held together by sp2 bonds. Graphite is composed of layers of graphene. The thinnest material known to exist is graphene, which measures one atom thick (0.345Nm). Actually, it is two-dimensional.
A hexagonal honeycomb lattice securely holds a single layer (monolayer) of carbon atoms together to form graphene. It is an allotrope of carbon with sp2-bonded atoms arranged in a plane and a molecular bond length of 0.142 nanometers.
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what happens when hydrogen peroxide is added to a catalase-positive culture? what is the appearance of the catalase-negative culture when hydrogen peroxide is added?
When hydrogen peroxide is added to catalase positive culture, there is a formation of bubbles of oxygen. When hydrogen peroxide is added to catalase negative culture, there is no formation of bubbles. This is called catalase test.
What is catalase test?
Catalase test determines if the catalase enzyme is present. Catalase enzyme catalyses the release of oxygen gas from hydrogen peroxide, when it is added to it. There is also formation of water by catalase enzyme.
When hydrogen peroxide is added to catalase positive culture, the catalase enzyme in it releases the oxygen gas from hydrogen peroxide in the form of bubbles. In the catalase negative culture, there is no catalase enzyme to release oxygen. This is called catalase test.
Therefore, in the catalase test, if the hydrogen peroxide is added to catalase positive culture there is a formation of bubbles due to the release of oxygen. In the absence of catalase enzyme there is no formation of bubbles due to the absence of oxygen gas.
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30.00 ml of a h2so4 solution with an unknown concentration was titrated to a phenolphthalein endpoint with 44.45 ml of a 0.1489 m naoh solution. what is the concentration of the h2so4 solution?
The concentration of the H2SO4 solution should be 0.1101 M.
Calculation of the concentration:
Since
Volume of H2SO4 = 30.00 mL = 0.030 L
Volume of NaOH= 44.45 mL = 0.04445 L
Concentration of NaOH= 0.1489 M
Now
The balanced equation is
H2SO4 + 2NaOH → Na2SO4 + 2H2O
Now the concentration of the H2SO4 solution is
b*Ca*Va = a*Cb*Vb
here, b = the coefficient of NaOH = 2
Ca = ?
Va = the volume of H2SO4= 30.0 mL = 0.030 L
a = the coefficient of H2SO4 = 1
Cb = the concentration of NaOH = 0.1489 M
Vb = the volume of NaOH = 44.45 mL = 0.04445 L
Now
2*Ca*0.030 = 1* 0.1489* 0.04445
0.060 * Ca = 0.00661
Ca = 0.1101 M
Hence, The concentration of the H2SO4 solution is 0.1101 M.
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A chemist burns isopropyl alcohol (C3H8O) according to the following equation: C3H8O + 3 O2 → 3 CO + 4 H2O If he burns 275 grams of C3H8O in excess oxygen, how many grams of water will be made?
Answer:
329.8g of H2O are produced
Explanation:
You have to do stoichiometry to convert grams of isopropyl alcohol to grams of water.
Convert grams of isopropyl alcohol to moles of isopropyl alcohol (use molar mass of isopropyl alcohol) Convert this to moles of water using molar coefficients Convert moles of water to grams (use molar mass of water)
A student was asked to formulate a hypothesis about what would happen if 100. mL of 0.1 M NaOH(aq) at
25°C was combined with 100. mL of 0.1 M MgCl₂(aq) at 25°C. Which of the following hypotheses indicates
that the student thought a chemical change would occur?
Answer:
There will be the formation of a Common salt (NaCl) and Mg(OH)2 which is a base after the reaction between the two chemicals