Answer:
A) Warmer
Explanation:
it says above 0
how does increasing plant biomas affect atmospheric co2
Plants absorbs the atmospheric carbon dioxide and use it up for photosynthesis. Hence, increasing plant biomass reduces the atmospheric carbon dioxide.
What is photosynthesis?Photosynthesis is a biochemical process by which the plants synthesis glucose and energy in leaves using carbon dioxide and water with the aid of light energy.
The pigment chlorophyll is a photoactive substance which absorbs the light energy. Using carbon dioxide and water plants synthesis glucose and oxygen is released in this reaction.
Therefore, as the plant biomass increases, the intake of carbon dioxide by these plants increases, leading to a reduction in the atmospheric carbon dioxide which is good to decline the effect of global warming also.
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Hi! please help me identify the IUPAC name for the structures
The IUPAC names of the organic compounds would be as follows:
1. Methanol or 1-Methanol
2. Propan-2-ol or 2-Propanol
3. 2-MethylButane
4. 1-Hexanol
5. 1-Heptanol
Naming organic compoundsIn the naming of organic compounds, some fundamental rules come into practice. Some of these rules include:
The longest carbon chain, otherwise known as the parent chain, is considered.The substituents must be identifiedThe parent chain should be named such that the substituents are located on the lowest-numbered carbons. Repeated substituents are named accordingly.Different substituents are named alphabetically and substituents with lower alphabets are considered for the lowest-numbered carbons.Following these rules and more, the name of the organic compounds whose structures are shown in the image would be as follows:
Methanol or 1-MethanolPropan-2-ol or 2-Propanol2-MethylButane1-Hexanol1-HeptanolMore on IUPAC naming can be found here: https://brainly.com/question/16631447
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Given that the vapor pressure of water is 17.54 Torr at 20 °C, calculate the vapor-pressure lowering, AP, of an aqueous solution
that is 1.80 m in sucrose (C₁2H₂₂O₁1).And
calculate the vapor-pressure lowering, AP, of an aqueous solution that is 1.80 m in aluminum chloride. Assume 100%
dissociation for electrolytes.
The vapor-pressure lowering, AP, of an aqueous solution is 2.44Torr.
Mole = [tex]\frac{weight}{molecular weight}[/tex]
In a 1.80m (molal) solution, 1 kilogram of the solvent contains 1.80 moles of the solute (which is water in this case).
Water's molar mass is equal to 2(atomic mass of H) + [2(1)+16] (atomic mass of O).
=18g/mol
The mole of water in 1 kilogram (equivalent to 1000 grams)::
[tex]n_{H_{2} O}[/tex]= [tex]\frac{1000}{18g/mol}[/tex] = 55.56mol
The solute's mole fraction in the 1.80 m solution is as follows::
[tex]x_{solute}[/tex] = [tex]\frac{n_{solute} }{n_{H_{2}O }}[/tex]
⇒[tex]x_{solute} =[/tex] [tex]\frac{1.80}{55.56}[/tex] = 0.032
a. Sucrose is a non-electrolyte, i.e., it does not undergo dissociation in the aqueous solution.
As a result, the Van't Hoff factor for sucrose is = i = 1
The lowering in vapor pressure of the solution, which is 1.80m in sucrose:
=[tex]ix_{solute}p^{0}[/tex]
=(1)(0.032)(17.54)Torr
=(0.56)Torr
b. Aluminum chloride dissociate in water as follows:
[tex]AlCl_{3}[/tex] →[tex]Al^{3+}+ 3Cl^{-}[/tex]
As a result, an aqueous solution containing one aluminum chloride particle yields four more particles.
Thus, i=4
The lowering in vapor pressure is thus:
=[tex]ix_{solute}p^{0}[/tex]
=(4)(0.032)(17.54)Torr
=(2.24)Torr
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2. If a solid dissolves in the liquid, sedimentation and decantation method cannot be used.Why?
Answer:
The answer is if a solid gets dissolved in a liquid then sedimentation and decantation cannot be used because these methods are used to separate an insoluble solid substance but if we add a little sugar or salt it will dissolve in the liquids it is soluble solid making it hard to separate.
Explanation:
I hope this helps
Avogadro's constant is the same as the number of
a. magnesium atoms in 24g of magnesium
b. nitrogen molecules in 14g of nitrogen
c. copper II sulfate formula units in 160g of copper II sulfate
Avogadro's constant is the same as the number of copper II sulfate formula units in 160g of copper II sulfate; option C.
What is Avogadro's constant?Avogadro's constant is a number that describes the number of particles in 1 mole of a substance.
The value of the Avogadro constant is 6.02 * 10²³.
The carbon-12 isotope is used as the standard to define the mole of a substance.
12 grams of the carbon-12 isotope contains the Avogadro number of particles which is equal to 6.02 * 10²³.
Hence, 1 mole of a substance is defined as the amount of a substance that contains as many elementary particles as there are in 12 grams of carbo-12.
Considering the given substances:
a. 24g of magnesium off magnesium contains two moles of magnesium atoms.
b. 14g of nitrogen gas contains 0.5 moles of nitrogen gas molecules
c. 160g of copper (ii) sulfate contains 1 mole of copper (ii) sulfate formula units. Hence, this is equal to the Avogadro constant
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50 POINTS!!! PLS ANSWER FAST In each test, iron(II) sulfate and iron(III) nitrate were combined with the same substance or substances. However, the sulfate and nitrate parts of the compounds didn’t participate in any of the chemical reactions; only the iron ions reacted. Comparing the results for each pair of tests, what can you conclude about the iron(II) and iron(III) ions?
Answer:
In each test, iron(II) sulfate and iron(III) nitrate were combined with the same substance or substances. However, the sulfate and nitrate parts of the compounds didn’t participate in any of the chemical reactions; only the iron ions reacted. Comparing the results for each pair of tests, what can you conclude about the iron(II) and iron(III) ions? i need the answer to it please do this
There are various kind of reaction like combustion reaction, displacement reaction. So to solve this problem we must be knowing the displacement reaction. Displacement reaction is taking place over here
What is displacement reaction?
Displacement reaction is a reaction in which one atom replaces other atom from a molecule on the basis of reactivity strength. The element which on the top of reactivity series displace the element that is lying below to that reactive element
According to our question the balanced equation is
FeSO₄+Zn ZnSO₄+Fe(II)
Fe(NO₃)₂+Zn Zn(NO₃)₂+Fe(II)
In both reaction Zn is more reactive than Fe(II) and Fe(III) that is why Zn replace or displace iron ion from its compound of sulfate and nitrate. Metal displace metals. anions are displaced by anions. So, here metal is displaced by zinc.
Thus we can conclude that zinc is more reactive than iron Fe(II) and Fe(III). Displacement reaction is taking place over here
Hope this helps!
A solution is prepared by dissolving sodium benzoate and benzoic acid in water to give a 9 mmol/litre concentration of each compound. The mixture has a pH of 4.21 at 25oC. Calculate the acid dissociation constant of benzoic acid, Ka.
Hint: pH = pKa + log10 ·[sodium benzoate] / [benzoic acid]
A solution is prepared by dissolving sodium benzoate and benzoic acid in water to give a 9 m mol / liter concentration of each compound. The mixture has a pH of 4.21 at 25 °C. the acid dissociation constant of benzoic acid, Ka is 6.1 × 10⁻⁵.
the pH of solution is given as :
pH = pka + log ( [sodium benzoate / benzoic acid])
4.21 = pka + log 1
pka = 4.21
pka = - log ka
ka = 10^- pka
ka = 6.2 × 10⁻⁵
Thus, A solution is prepared by dissolving sodium benzoate and benzoic acid in water to give a 9 m mol / liter concentration of each compound. The mixture has a pH of 4.21 at 25 °C. the acid dissociation constant of benzoic acid, Ka is 6.1 × 10⁻⁵.
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If you have 37.75 g of S, how many moles does it correspond to?
If we have 37.75 g of S , the number of moles is 1.17 mol.
Given that :
mass of Sulphur , S = 37.75 g
Molar mass of Sulphur , S = 32 g / mol
The number of moles of substances is equals to the ,mass of substance given to the molar mass of that substance.
number of moles = mass / molar mass
number of moles of sulphur = 37.75 g / 32 g / mol
number of moles of sulphur = 1.17 mol
Thus, If we have 37.75 g of S , the number of moles is 1.17 mol.
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How much heat is released during the combustion of 1.39 kg of C5H12?
The heat that is released by the 1.39 Kg of pentane is 58518 kJ.
What is the heat released?We know that the combustion of pentane is an exothermic reaction because heat is released in the process. We have to look to the balanced thermochemical reaction equation for the combustion of pentane.
Given that the number of moles of the pentane that is burnt here = 1.39 * 10^3 g/72 g/mol
= 19.3 moles
Now;
If we require 3032 kJ of energy to burn one mole of pentane
If we have 19.3 moles of pentane then we have;
19.3 moles * 3032 kJ/ 1 mole
= 58518 kJ
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Someone help, I don't understand this please.
Calculate the average atomic mass of magnesium, given the data in the table below. Show your work.
Magnesium - 24 / Mass 23.9850 / Percent Abundance 78.99%
Magnesium - 25 / Mass 24.9859 / Percent Abundance 10.00%
Magnesium - 25 / Mass 25.9825 / Percent Abundance 11.01%
Answer:
24.984466667
Explanation:
add all mass values and divide by amount (3)
Are there substances in the lab that have bonds that are not strictly ionic, covalent, or metallic? Explain your answers.
Metallic bonds occur amid metal atoms. Whereas ionic bonds combine metals with non-metals, metallic bonding fixes several metal atoms.
What determines bond is ionic, covalent, or metallic?An ionic bond is formed by joining a metal and a nonmetal, while a covalent bond is formed by allying two nonmetals. So we check the periodic table to see if our compound is made up of metals or nonmetals, or of two nonmetals.
Covalent compounds are built when two nonmetals react with each other. Since hydrogen is a nonmetal, binary compounds that carry hydrogen are also usually covalent compounds. Metallic elements produced compounds with non-metallic elements with the help of ionic bonds.
So we can conclude that In metals, the electrons leave the outer shells of metal atoms, devise positive metal ions and a 'sea' of delocalized electrons.
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Which of the following alcohols is used in antifreeze?
ethylene glycol
glycerol
ethanol
isopropyl alcohol
Answer:
No entendí porfavor puedes explicarme
Each element is composed of a unique kind of atom.
True or False
Answer:
True.
Explanation:
At 125 °C a gas has a volume of 145 mL. What will the volume be at 25.0 °C ?
If a gas has a volume of 145 mL at 125 °C, then it will have 108.56 mL at 25 °C.
According to Charles’ law, the volume of a gas is directly proportional to the temperature.
Thus, V1/T1=V2/T2 .......(i)
Here, V1 ⇒ initial volume
T1 ⇒ initial temperature in Kelvin
V2 ⇒ final volume
T2 ⇒ final temperature in Kelvin.
In the given question:
V1 = 145mL
T1 = 125°C= (125+273)K= 398K
T2 = 25°C= (25+273)K= 298K
Putting these values in equation (i),
145mL / 398K = V2 / 298K
Solving for V2, we get
V2 = 145mL * 298K /398 K
V2 = 108.56 mL
Therefore, at 25 °C, the gas will have a volume of 108.56 mL.
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Two solutions are prepared by a chemist. One of the solutions is 150.0 ml of a 3.5 x 10¹5 M HNO3.
The other solution is 250.0 ml of a 0.63 M solution of HNO2.
Compare the pH of each solution.
The pH of the solutions are as follows:
a. pH = 4.4
b. pH = 0.2
What is the pH of a solution?The pH of a solution is a measure of the acidity or basicity of a solution.
The pH is defined as the negative logarithm of the hydrogen ion concentration of a substance.
pH = -log [H⁺]
where [H⁺] is the hydrogen ion concentration
The pH of the solutions are as follows:
a. 150.0 ml of a 3.5 x 10⁻⁵ M HNO3.
pH = -log (3.5 x 10⁻⁵)
pH = 4.4
b. 250.0 ml of a 0.63 M solution of HNO2
pH = -log (0.63)
pH = 0.2
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the number of electron dense areas of SeCl6
Using the Valence shell electron pair repulsion theory, there are six electron dense areas in the compound.
What is the valence shell electron pair repulsion theory?According to the valence shell electron pair repulsion theory, the number of electron pairs that surround the valence shell of the central atom of the molecule is the determinant factor of the shape of the molecule.
Thus, the repulsion between the electron pairs would make the compound to assume a certain shape as the electrons would be able to maximize the repulsion that does exists between them.
In this case, we have a compound that have a central tom that is surround be six electron pairs that surround the central atom and they are all bond pairs of electron thus we would have six areas of electron density.
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It's 100 degrees outside today. You forgot your nearly full water bottle in the car when you went into the store. When you return later, you open the water bottle and it makes a "hissing" sound. Explain why this occurs. In your response, discuss what is happening with the water molecules and how thermal energy is changing.
The hissing sound from the water bottle occurred due to increase in thermal energy of the car which is the immediate environment of the water bottle.
What is thermal energy?Thermal energy is defined as the type of energy that expresses the flow of heat through a medium.
When there is increase in heat energy, outside the an enclosed medium such as a car, all the contents within the medium also increases in temperature.
There is also a rise in temperature of water in the water bottle and this causes the water molecules to gain energy, vibrate and collide more often among each other.
The hissing sound occurs due to a rise in pressure of the water occuring due to rise in temperature.
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We are given a solution of 12.0 M HCI and want
to prepare 300 mL of a 0.6 M solution. How
would we prepare it? (300 mL = 0.3 L)
M₁V1=M₂V2
M₁ = ? M
V₁ = ? L
M₂= ? M
V₂ = ? L
V₁ = ? L
The solution of 12.0 M HCl and to prepare 300 mL of a 0.6 M solution , the initial volume is 0.015 L.
given that :
Molarity M1 = 12.0 M
volume V1 = ?
Molarity M2 = 0.6 M
Volume V2 = 300 mL = 0.3 L
The dilution law is given as :
M1 V1 = M2 V2
12.0 × V1 = 0.6 × 0.3 L
V1 = 0.18 / 12
V1 = 0.015 L
Thus, The solution of 12.0 M HCl and to prepare 300 mL of a 0.6 M solution , the initial volume is 0.015 L.
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What makes an element give off a specific color? Please explain.
The elements give off specific color because the energy of shells of different elements are specific.
Electrons when excited jump from a lower energy level to higher energy level. in higher energy level the electron are less stable . so, after some time they return from higher to lower energy level an emit some light of different wavelength of specific colors. The difference in the energy of the shells of the atom are specific. the color of different elements are different because of the light emitted and the wavelength is inversely proportional to energy.
E = hc / λ
Thus, The elements give off specific color because the energy of shells of different elements are specific.
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Given the equation:
C2H6 (g) + O2 (g) → CO2 (g) + H2O (g) (not balanced)
Determine the number of liters of CO2 formed at STP when 891.6 grams of C2H6 is burned in excess oxygen gas.
Your answer should be numerical and neglect units (e.g., if you calculate 3.5L then input 3.5).
The volume of CO₂ produced at STP when 891.6 grams of C2H6 is burned in excess oxygen gas is 1331.4 liters.
What is the volume in liters of CO₂ produced when 891.6 grams of C2H6 is burned in excess oxygen gas?The volume of a gas produced at STP is determined from the mole ratio of the reaction that produces the gas.
The mole ratio of the reaction that produces the gas is obtained from the equation of the reaction.
Considering the given data, the volume of CO₂ produced when 891.6 grams of C2H6 is burned in excess oxygen gas is calculated as follows:
Equation of reaction: 2 C₂H₆ (g) + 7 O₂ (g) → 4 CO₂ (g) + 6 H₂O (g)
2 moles of C₂H₆ when burned in excess oxygen at STP produces 4 moles of CO₂.
The number of moles of C₂H₆ in 891.6 grams is calculated as follows:
Moles = mass / molar mass
The molar mass of C₂H₆ = 30 g/mol
Moles of C₂H₆ in 891.6 g = 891.6 / 30
Moles of C₂H₆ = 29.72 moles
Hence moles of CO₂ produced = 29.72 * 4/2 moles
Volume of 1 mole of CO₂ at STP = 22.4 liters
Volume of CO₂ produced = 29.72 * 4/2 * 22.4
Volume of CO₂produced = 1331.4 liters.
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For electromagnetic radiation with a wavelength of 839.6 nm: (a) What is the frequency of the radiation (in s-1)? (b) What is the energy (in J) of one photon of the radiation? (c) What is the energy (in kJ) of one mole of photons of the radiation?
The frequency of the photon is 3.57 * 10^14 Hz. the energy in joules is 2.4 * 10^-19 J while the energy in kJ/mol is 3.9 * 10^-40 kJ/mol.
What is the energy?The energy of the photon can be obtained by the use of an adaptation of the Plank equation. Let us now use;
E = hc/λ
E = energy
h = Plank Constant
c = Speed of light
λ = wavelength
a)
c = λf
f = c/λ
Substituting values;
f = 3 * 10^8/839.6 * 10^-9
f = 3.57 * 10^14 Hz
b)
E = 6.6 * 10^-34 * 3 * 10^8/ 839.6 * 10^-9
E = 2.4 * 10^-19 J
c)
Energy in kJ/mole
Substituting values;
2.4 * 10^-19 J * 10^3/6.02 * 10^23
= 3.9 * 10^-40 kJ/mol
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Starch and cellulose have similar chemical structures, but differ in the _____.
substituents added to glucose monomers
orientation of bonds between glucose monomers
simple sugar that serves as a monomer
length of the monomer chain
Starch and cellulose have similar chemical structures, but differ in the orientation of bonds between glucose monomers.
Starch is glucose polymer in which repeating unit are connect by alpha bond and all the repeating unit are direct in one direction. starch is present in foods. it is less crystalline.
Cellulose is also a glucose polymer but cellulose units can be rotated around the axis of backbone of glucose polymer. cellulose is natural organic compound. glucose if formed by the combination of carbon, hydrogen , oxygen , .
Thus, Starch and cellulose have similar chemical structures, but differ in the orientation of bonds between glucose monomers
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Can someone help me please
The number of moles of F₂ is 0.453 mol
The grams of F₂ are present is 17.21 g
given that :
pressure P = 5.2 atm
volume V = 2.55 L
temperature T = ( 273 + 83 ) = 356 K
using the gas equation , we get
PV = nRT
n = PV / RT
n = ( 5.2 × 2.55 ) / (0.0821 × 356)
n = 13.26 / 29.22
n = 0.453 mol
the mass of F₂ = moles × molar mas
= 0.453 × 38
= 17.21 g
Thus, The number of moles of F₂ is 0.453 mol
The grams of F₂ are present is 17.21 g
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please help!!!! ⚠️⚠️⚠️⚠️⚠️⚠️⚠️⚠️
Polyatomic ions: [tex]CH_3COO^-[/tex], [tex]NO_3^-[/tex], [tex]NH^+[/tex], [tex]CN^-[/tex], [tex]Li^+[/tex], and [tex]OH^-[/tex]
Monatomic ions: [tex]Ca^{2+[/tex], [tex]O^{2-[/tex], and [tex]Fe^{3+[/tex]
Monoatomic vs Polyatomic IonsIn chemistry, monoatomic ions are ions that consist of only a single type of atom. They are usually positive or negatively charged and are otherwise known as simple ions. Examples include [tex]Ca^{2+[/tex], [tex]O^{2-[/tex], and [tex]Fe^{3+[/tex]
Polyatomic ions, on the other hand, are ions that consist of more than one atom, unlike monoatomic ions. The two or more atoms are covalently bonded and the entire structure behaves like a single chemical entity in reactions. Polyatomic ions are otherwise known as molecular ions.
Examples of polyatomic ions are [tex]CH_3COO^-[/tex], [tex]NO_3^-[/tex], [tex]NH^+[/tex], [tex]CN^-[/tex], [tex]Li^+[/tex], and [tex]OH^-[/tex]
Thus, from the diagram:
Polyatomic ions: [tex]CH_3COO^-[/tex], [tex]NO_3^-[/tex], [tex]NH^+[/tex], [tex]CN^-[/tex], [tex]Li^+[/tex], and [tex]OH^-[/tex]Monatomic ions: [tex]Ca^{2+[/tex], [tex]O^{2-[/tex], and [tex]Fe^{3+[/tex]More on ions can be found here: https://brainly.com/question/14982375
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What order is the typical sequence of events in the scientific method?
The typical sequence of events in the scientific method is to define question , make prediction, collect data, analyze data, Experiment, test hypothesis, draw conclusion , report result.
the following are the steps in the scientific method :
1) first step to define a question for the investigation.
2) Then make prediction : do some research related to the question and the study related theories.
3)collect the data : collect all the data from the research .
4) analyze the data
5) experiments : perform the experiments
6) test the hypothesis: accept or reject hypothesis.
7) draw the conclusion
8) report your result.
Thus , The typical sequence of events in the scientific method is to define question , make prediction, collect data, analyze data, experiments , test hypothesis, draw conclusion , report result.
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What is the coefficient of HCl when the equation is balanced with smallest whole numbers?
MnO2 + HCl → MnCl2 + Cl2 + H2O
3
2
4
8
There are 0.05216 mol ZnSO4 and
0.3609 mol H2O in the sample.
Step 3: Divide each by the smallest number
of moles to get the ratio.
What is the ratio of ZnSO4:H2O?
[?]
mol ZnSO4: [?] mol H2O
The ratio of mol of ZnSO₄ : mol H₂O is 1:7.
Empirical formula- The relative ratios of the various atoms in a compound are given by an empirical formula. The ratios are still valid at the molar level. As a result, H₂O is made up of two hydrogen and one oxygen atoms. Similar to how 2.0 moles of hydrogen and 1.0 mole of oxygen make up 1.0 mole .
Steps to determine Empirical formula-
Determine the masses in Step 1. Step 2: Multiply the grams by the atomic mass to get the number of moles. Step 3: Subtract the smallest number of moles from the total number of moles of each element. Step 4: Make entire numbers out of the numbers.
Given,
0.05216 mol of ZnSO₄
0.3609 mol of H₂O
Here, the smallest number of mole is 0.05216.
Dividing each by the smallest number of moles to get the ratio -
⇒ 0.05216/ 0.05216 = 1
⇒ 0.3609/ 0.05216 = 6.91 ≈ 7
Therefore the mol ratio of ZnSO₄ and H₂O are 1 and 7 respectively.
Hence, 1 mol ZnSO₄ : 7 mol H₂O.
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How many Joules are needed to increase the temperature of 150 g of water from 313K to 338 K?
-18,037.5 are joules are needed to increase the temperature of 150 g of water from 313K to 338 K.
What is joules?
In the International System of Units (SI), a joule is a unit of work or energy equal to the work done by a force of one newton acting through one metre. It is named after the English physicist James Prescott Joule and equals 107 ergs, or about 0.7377 foot-pounds. The joule is equal to one watt-second in electrical terms, which is the amount of energy released in one second by a current of one ampere through a resistance of one ohm.
The distinction between heat and temperature can be difficult to grasp. Heat is essentially the total amount of kinetic energy that a substance's molecules contain, and it is measured in joules (J). Temperature is measured in degrees and is proportional to the average kinetic energy of the individual molecules. When the same quantity of heat is applied to different materials, the temperature rises at varying rates depending on the substance's specific heat capacity. If you know the amount of the substance and its specific heat capacity, you may determine the final temperature.
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A 1.50 g of urea/cholesterol mixture was added to 25.0 mL of water to separate the two compounds. The solid sample collected after filtration is 0.52. What is the % of urea in the sample
Based on the mass of the sample, the percentage mass of urea in the urea/cholesterol mixture is 65.3%.
What is the percentage of urea in the urea/cholesterol mixture?The percentage mass of urea in the urea/cholesterol mixture is determined using the formula below:
Percentage of urea = (mass of urea in sample/mass of sample) * 100%The mass of urea in the sample is obtained using the formula below:
Mass of urea = mass of sample - mass of cholesterolDuring the separation procedure of the mixture, urea which is soluble in water goes into the solvent phase whereas cholesterol is obtained as a solid.
Hence, the 0.52 g solid sample collected is cholesterol.
mass of urea = 1.50 - 0.52
mass of urea = 0.98
Percentage urea = 0.98/1.5 * 100%
Percentage mass of urea = 65.3%
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What is the physical state of strontium at 25 degrees?
Answer:
Strontium is a chemical element with symbol Sr and atomic number 38. Classified as an alkaline earth metal, Strontium is a solid at room temperature.
Explanation: