A 1.0 × 10⁻⁸ M solution of the HCl have the pH < 7. The value of the pH for HCl is pH = 6.99.
The concentration of the HCl = 1.0 × 10⁻⁸ M
Total [H⁺] = [H⁺] HCl + [H⁺] water
The HCl is the strong acid , so it completely ionizes.
[H⁺] H₂O = X
Total [H⁺] = X + 1.0 × 10⁻⁸
[H⁺] [OH⁻] = 1 × 10⁻¹⁴
X₂ + 10⁻⁸X - 10⁻¹⁴ = 0
X = 9.5 × 10⁻⁸
Total [H⁺] = 9.5 × 10⁻⁸ + 1.0 × 10⁻⁸
= 1.05 × 10⁻⁷
pH = - log [H⁺]
pH = - log [1.05 × 10⁻⁷]
pH = 6.99.
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when magnesium ionizes to form a magnesium ion, electrons from the ______ sublevel are lost.
when magnesium ionizes to form a magnesium ion, electrons from the ______ sublevel are lost.
When magnesium ionizes to form a magnesium ion, electrons from the 3rd energy sublevel (3s) are lost.
In an atom, electrons occupy certain regions called energy levels or electron shells. These energy levels are represented by the principal quantum number (n), with the lowest energy level being n=1 and the highest energy level being n=infinity. Within each energy level, electrons occupy specific sublevels, which are represented by the angular momentum quantum number (l). These sublevels are labeled s, p, d, and f, corresponding to l=0, 1, 2, and 3 respectively. The number of electrons that can occupy each energy level or sublevel is determined by the Pauli Exclusion Principle and Hund's Rule.As an electron moves to a higher energy level, it must gain energy. Conversely, as an electron moves to a lower energy level, it releases energy. This energy can be in the form of electromagnetic radiation, such as light.
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The symbol of a simple unprefixed SI unit has been left off of each measurement in the table below. Fill in the missing unit symbols the height of a typical room ceiling = 3.
the mass of an apple = 250. the minimum mass of an official Major League baseball = 142. how long a typical TV ad lasts = 30.
The missing symbols of the missing SI units are:
the height of a typical room ceiling = 3 mthe mass of an apple = 250 gthe minimum mass of an official Major League baseball = 142 ghow long a typical TV ad lasts = 30 sWhat are the SI units of measurement?The SI units of measurement are units by which measurements of certain properties of objects such as mass, length, etc are taken.
The SI units of measurement are universally accepted units of measurement by scientists in taking measurements of both fundamental and derived quantities.
Seven base units—the second (symbol s, the unit of time), the meter (m, the unit of length), the kilogram (kg, the unit of mass), the ampere (A, the unit of electric current), the kelvin (K, the unit of thermodynamic temperature), the mole (mol, the unit of substance amount), and the candela—make up the SI's coherent system of units of measurement (cd, luminous intensity).
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N-Tosylamido-L-phenylethyl, also called tosyl phenylalanyl chloromethyl ketone, (TPCK) irreversibly inhibits chymotrypsin, and is used as to label the active site histidine residue. The COCH2Cl group is the reactive group that binds to the His residue. Why does chymotrypsin bind TPCK? Trypsin, another serine protease, does not bind TPCK. How could TPCK be modified to enable its recognition by trypsin? Choose the most likely substrate, below.
Chymotrypsin binds TPCK because the COCH2Cl group, also called the tosyl group, is a highly reactive electrophile that can form covalent bonds with the nucleophilic amine group.
The Histidine residues are important for catalysis in proteases. Trypsin, another serine protease, does not bind TPCK, because the active site of trypsin does not have a histidine residue in the same position as chymotrypsin.
To enable TPCK to be recognized by trypsin, the TPCK could be modified to include a group that specifically targets the active site of trypsin. This could be achieved by introducing an electrophile group that can form covalent bonds with the nucleophilic serine residue in the active site of trypsin.
The most likely substrate for trypsin is a protein that has the arginine or lysine amino acids in the P1 position.
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What is the mass of 9.35x10^26 particles of carbon? Carbon has a molar mass of 12.01 g/mol.
The mass of 9.35 x 10^26 particles of carbon is 18.34 grams.
To find the mass of a certain number of particles of a substance, we can use the concept of molar mass. The molar mass of a substance is the mass of one mole of that substance, and it is usually expressed in grams per mole (g/mol). The molar mass of carbon is 12.01 g/mol.
To find the mass of 9.35 x 10^26 particles of carbon, we can use the following equation:
mass = molar mass x number of moles
To find the number of moles we can use Avogadro's number, which is 6.022 x 10^23 particles per mole.
mass = 12.01 g/mol * (9.35 x 10^26 particles / 6.022 x 10^23 particles/mol)
mass = 12.01 g/mol * 1.54 mol
mass = 18.34 g
So the mass of 9.35 x 10^26 particles of carbon is 18.34 grams.
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More water leaves the oceans through evaporation than is added to the oceans through precipitation. Which process keeps ocean water levels from dropping?
A.
evaporation
B.
transpiration
C.
condensation
D.
runoff
The process that keeps ocean water levels from dropping is called A. evaporation.
What is the physical phenomenon of evaporation?The physical phenomenon of evaporation can be defined as the passage of a given compound from a liquid state to a gaseous state which in the case of water is represented by vapor water that condenses and falls into the oceans as precipitation.
Therefore, with this data, we can see that the physical phenomenon of evaporation is able to decrease the level of water in the ocean and this process is directly associated with subsequent precipitation.
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how many atoms are in 1.2 mol of carbon?
The nucleus of a carbon atom consists of six protons and six neutrons, which are encased in a six-electron shell.
How many moles are in carbon?A carbon atom's nucleus is made up of six protons and six neutrons, which are protected by a six-electron shell.
Since a mole represents 6.022 * 1023 by definition, converting moles to atoms is as easy as multiplying the amount of moles by that number.
Avogadro's number of atoms (6.02 1023) can be found in one mole of any substance. We must apply the conversion factor: number of atoms x 1 mole / 6.023 x 1023 atoms in order to convert the number of atoms to the number of moles.
12 grammes of pure carbon-12 weigh exactly one mole, which is equal to 6.022 x 1023 atoms. • Avogadro's Number is the number of particles in one mole.
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The compound CrBr3 is an ionic compound. What are the ions of which it is composed?
Cation formula
_____________
Anion formula
_____________
Answer:
Cation formula: Cr(III)
Anion formula: Br3
Explanation:
Chromium has an oxidation sate of +3. Bromine is -1. One Cr atom will combine with 3 Br atoms to form a neutral molecule.
what information can be obtained by knowing the electronegativity differences between two elements?
Electronegativity differences between two elements shows whether the element will bond together with an ionic bond, a polar bond or a non polar bond.
The term Electronegativity is a measure of the tendency of an atom to attract electrons towards itself. It determines the shared electrons are distributed between the two atoms. The differences in electronegativity shows whether a bond is nonpolar or polar. The electronegativity increases from left to right across a period in the periodic table. It decreases down a group. All Metals tend to be less electronegative elements. It helps to identify the bonds between the atoms in a molecule. It shows how the shared electrons are distributed between the two atoms in a bond.
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Why does the water follow solutes
Answer to Indicate whether each of the following structures has the R or the S configuration: a. CH(CH3)
b. 2 CH;CH
c. CH, CH,
d. Br CH3
The first structure has the R configuration, the second and third structures have the S configuration, and the fourth structure has the R configuration
a. CH(CH3) - In this structure, the chiral carbon is bonded to three different groups so it has the R configuration.
b. 2 CH;CH - In this structure, the chiral carbon is bonded to two different groups so it has the S configuration.
c. CH, CH, - In this structure, the chiral carbon is bonded to two different groups so it has the S configuration.
d. Br CH3 - In this structure, the chiral carbon is bonded to three different groups so it has the R configuration.
The first structure has the R configuration, the second and third structures have the S configuration, and the fourth structure has the R configuration
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This is the liquid part of the paint that holds the pigment so it can be applied to a surface.
Paint has a component known as the binder, which is a liquid that is responsible for holding the pigment particles together and enabling the paint to be applied to a surface.
Without a binder, the pigment would not be able to stick to the surface and would simply fall off or rub off. The binder serves as a "glue" that holds the pigment in place and helps it adhere to the surface. There are various types of binders that can be used in paint, including oil, water, and various synthetic polymers. The choice of binder will depend on the type of paint being used and the desired properties of the finished product.
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Which of these molecules are linear? Check all that apply. XeF2 BeCl2 SF2 NO2-
According to the molecular geometry, XeF₂ and BeCl₂ molecules have linear geometry.
What is molecular geometry?
Molecular geometry can be defined as a three -dimensional arrangement of atoms which constitute the molecule.It includes parameters like bond length,bond angle and torsional angles.
It influences many properties of molecules like reactivity,polarity color,magnetism .The molecular geometry can be determined by various spectroscopic methods and diffraction methods , some of which are infrared,microwave and Raman spectroscopy.
They provide information about geometry by taking into considerations the vibrational and rotational absorbance of a substance.Neutron and electron diffraction techniques provide information about the distance between nuclei and electron density.
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The height of an Evian bottle is approximately 25 cm. If 31.2 x 109 empty water bottles were laid end-to-end around the equator, how many times would the water bottle trail wrap around the globe. The circumference of the earth at the equator is 24,860 miles (1 mile = 1.609 km).(b) How many times would the water bottle trail wrap around the globe if the Evian bottles were laid side-by-side
(a) The water bottle trail would wrap around the globe 15,993,256 times. (b) the water bottle trail would wrap around the globe 19,991,570 times if the bottles were laid side-by-side.
(a) To find out how many times the water bottle trail would wrap around the globe if the bottles were laid end-to-end, we need to divide the circumference of the earth (in the same units as the bottle height) by the height of the bottle.
First, we need to convert the circumference of the Earth from miles to cm.
24,860 miles * 1.609 km/mile * 100 cm/m = 399,831,400 cm
Then, we divide the circumference of the earth by the height of the bottle:
399,831,400 cm / 25 cm/bottle = 15,993,256 bottles.
So, the water bottle trail would wrap around the globe 15,993,256 times.
(b) To find out how many times the water bottle trail would wrap around the globe if the bottles were laid side-by-side, we need to divide the circumference of the earth by the width of the bottle.
Let's assume that 5cm of the bottle space is covered when placed side by side
So the width of the bottle is 25cm-5cm = 20cm
we divide the circumference of the earth by the width of the bottle:
399,831,400 cm / 20 cm/bottle = 19,991,570 bottles.
So, the water bottle trail would wrap around the globe 19,991,570 times if the bottles were laid side-by-side.
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Question- The height of an Evian bottle is approximately 25 cm. If 31.2 x 109 empty water bottles were laid end-to-end around the equator, how many times would the water bottle trail wrap around the globe. The circumference of the earth at the equator is 24,860 miles (1 mile = 1.609 km).(b) How many times would the water bottle trail wrap around the globe if the Evian bottles were laid side-by-side. Assume that 5 cm of the bottle space is covered when placed side by side.
Which best describes what happens to the atoms during the combustion of ethanol? A. The reactant atoms are changed into product atoms. B. Many more atoms are added as the reaction volume grows. C. The reactant atoms are destroyed and new product atoms are formed. D. The atoms rearrange into different molecules but no atoms are destroyed or formed.
The best option which best describes atoms during the combustion of ethanol is that the atoms rearrange into different molecules but no atoms are destroyed or formed and is therefore denoted as option D.
What is Combustion?This is referred to as the process where a substance burns in the presence of oxygen, giving off heat and light in the process.
During combustion of ethanol , the atoms present in it and oxygen are rearranged to form carbon dioxide and water which are regarded as the product of the reaction which is thereby the reason why it was chosen as the correct choice.
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a cell in g2 has 0.8 picograms (pg) of dna. how much dna did that cell have in g1?
0.4 pg of DNA in g1 cell.
A cell in the G1 phase, generally known as diploid, contains 2N( N being the number of chromosomes) of DNA, whereas a cell in the G2 phase contains 4N of DNA(tetraploid). Depending on the cell's replication stage, the DNA content of a cell in the S phase ranges from 2N to 4N.
Each chromosome has a single chromatid, which is made up of a single double- stranded DNA patch, at the G1 phase of the cell cycle. thus, a cell with 12 chromosomes in its normal state will contain 12 DNA motes in G1.
By assembling the needed organelles for mitosis, the alternate growth phase begins to prepare the cells with recently copied DNA for entry into the mitotic phase.
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For official use only (fouo) and controlled unclassified information (cui) may include all of the following except:.
For official use only (fouo) and controlled unclassified information (cui) may include all of the following except Personnel information. The correct answer is B,
Sensitive but Unclassified (SBU), Law Enforcement Sensitive, and For Official Use Only (FOUO) are all subcategories of Controlled Unclassified Information (CUI) (LES). Today, CUI is used more frequently than any of the previous three. For information pertaining to the government, these names are used.
Most governments use the security information classification term "For Official Use only" when referring to information. It is strictly unclassified in the US and used by the Department of Defense to manage requests for controlled Unclassified Information (CUI). Eliminating ineffective and deceptive patchwork among departments of defense agencies is the main goal of this program.
Your question is incomplete but most probably your full question was
For Official Use Only (FOUO) and Controlled Unclassified Information (CUI) may include all of the following except: (circle one) a. Secret information b. Personnel information c. Payroll information d. Sensitive information
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complete the mechanism for the generation of the electrophile used for chlorination in electrophilic aromatic substitution. add curved arrows, bonds, electron pairs, and charges where applicable.
The electrophilic aromatic substitution (EAS) through chlorination mechanism involves the use of a Lewis acid catalyst to transfer a proton from a protonated solvent to the aromatic ring creating an electrophilic carbon atom that reacts with chlorine to form an electrophilic chlorine atom.
Electrophilic aromatic substitution (EAS) is a common method used to introduce a substituent on an aromatic ring. One of the most widely used EAS reactions is the chlorination of an aromatic ring, where a chlorine atom is introduced as a substituent.
The mechanism of this reaction involves the use of a Lewis acid, such as FeCl3 or AlCl3, as a catalyst. The Lewis acid acts as a proton acceptor, allowing for the transfer of a proton from a protonated solvent, such as HCl, to the aromatic ring.
[tex]H_3C-C_6H_5 + HCl + FeCl_3[/tex] → [tex]H_3C-C_6H_5-H^{+} + Cl^{-} + FeCl_2[/tex]
[tex]H_3C-C_6H_5-H^+ + Cl^-[/tex] → [tex]H_3C-C_6H_5-Cl^+[/tex]
The curved arrow points from H+ to C6H5.
This creates an electrophilic carbon atom on the ring, which then reacts with a chlorine atom to form an electrophilic chlorine atom, represented by the structure [tex]H_3C-C_6H_5-Cl^+[/tex] .
This process is a key step in the synthesis of many compounds, including pharmaceuticals and agrochemicals.
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need description of the rocks on table B, read the instructions. I already have the rocks sorted out
Conglomerate is a type of rock that is made up of rounded fragments of rock that are held together by a matrix of finer materials, such as sand or clay. It is typically formed in a shallow marine environment or near the mouth of a river.
Limestone is a sedimentary rock that is composed mostly of calcite, a mineral made up of the remains of marine organisms such as coral and mollusks. It is formed in a variety of environments, including shallow marine, tidal flat, and lagoonal environments.
Basalt is an igneous rock that is formed from the solidification of molten lava. It is characterized by its dense, fine-grained texture and is commonly found in the form of volcanic lava flows or as the cooled top layer of a lava dome.
Trilobite is not a rock; it is a type of fossil that is found in sedimentary rocks such as shale and sandstone. Trilobites were arthropods that lived during the Paleozoic Era, from about 521 to 252 million years ago. They are characterized by their distinctive three-lobed bodies and are known for the many different species that existed during this time period.
What is a rock?A rock is a naturally occurring solid substance composed of one or more minerals, mineraloids, or organic materials. It is typically formed through geological processes such as heat and pressure, and it can be found in a variety of environments on Earth, including on the surface and underground. There are three main types of rocks: igneous, sedimentary, and metamorphic.
Therefore, the correct answers are as given above
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the ionic compound (NH4)2 SO4 is soluble in water True False
True, the ionic compound (NH₄)₂ · SO₄ is soluble in water.
Solubility is a measure of the ability of a substance to dissolve in a solvent. It is the maximum amount of a substance that can be dissolved in a given amount of solvent at a specific temperature and pressure.
(NH₄)₂ · SO₄ is an ionic compound composed of the ions ammonium (NH₄⁺) and sulfate (SO₄⁻²). It is generally considered to be soluble in water.
Ammonium ions and sulfate ions are both highly polar, and are thus able to interact with the polar water molecules to create a stable solution. Additionally, the ammonium ion is a weak base, and it can react with water to form hydroxide ions and ammonia, which also helps to increase the solubility of the compound in water.
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Calculate the amount of heat needed to heat 190.0 g of liquid water from 18 °C to 100°C.
To solve this we must be knowing each and every concept related to Enthalpy. Therefore, the amount of heat needed to heat 190.0 g of liquid water from 18 °C to 100°C is 12,281.6 Joules.
What is Enthalpy?Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have. Mathematically, Enthalpy is directly proportional to specific heat capacity of a substances.
Mathematically,
Enthalpy=mass of solution ×specific heat capacity of solution× Change in temperature.
Q = m × c ×Δt
Mass of water vapor, m = 190.0 g
Change in temperature, Δt = 150°C - 118°C
= 32°C
specific heat capacity of water vapor = 2.02 J/g°C
Amount of heat = 190.0 g × 2.02 J/g°C × 32°C
= 12,281.6 Joules
Therefore, the amount of heat needed to heat 190.0 g of liquid water from 18 °C to 100°C is 12,281.6 Joules.
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select the classification for the following reaction. koh(aq) + hcl(aq) → kcl(aq) + h2o(l) A.None of these choices is correct. B..acid-base C.precipitation D.combination E.redox
The reaction is : KOH + HCl ---> KCl + H₂O is double displacement reaction and it is also the neutralization reaction . So, the correct option is B) acid - base.
The reaction is given below :
KOH + HCl ---> KCl + H₂O
This reaction is the neutralization reaction as well as the double displacement reaction. The neutralization reaction is the reaction in which the acid and base react and produces the salt and the water. This is also called as the acid base reaction.
The double displacement reaction is the reaction in which the reactant ions exchange places and form the new product.
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flexible collodion contains 20% w/w camphor and 30% w/w castor oil. how many grams of each would be contained in 30 g of the mixture?
The mass of each gram of camphor is 5 grams, and the mass of each gram of castor oil is3.33 grams.
The mass chance has been the mass present in 100 grams of result.
The mass of camphor(20 w/ w)
100 grams result = 20 grams camphor
1 gram result = 5 grams camphor.
The mass of Castor oil (30 w/ w)
100 grams result = 30 grams castor oil
1 gram result = 3.33 grams castor oil.
Flexible collodion is a name given to a result of 4 g of nitrocellulose in 100 mL of a admixture of 25 mL of ethanol and 75 mL of ether, with 2 camphor and 3 castor oil(by wt.); the camphor and castor oil conduct the inflexibility. It can be set up in ½ liter bottles in utmost chemical force registers.
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Explain how cobalt chloride papers can be used as humidity detectors
Answer:
Cobalt chloride papers are often used as humidity indicators because they change color in response to the relative humidity of the air. When the air is dry, the cobalt chloride paper is blue or purple. As the air becomes more humid, the paper turns pink or red. The color change is reversible, meaning that the paper will return to its original color as the humidity decreases.
1s22s22p63s23p64s23d2 is the correct electron configuration for which of the following atoms?
Ca
Ti
Ge
Zr
1s²2s²2p⁶3s²3p⁶4s²3d² is the correct electron configuration for Titanium (Ti). the correct answer is B
There are 22 electrons in all, according to the electron arrangement. A neutral atom will contain 22 protons if it has 22 electrons. The element is determined by its atomic number where we know that
The atomic number = number of proton = number electrons
Atomic number 22 corresponds to titanium.
The chemical element titanium has the atomic number 22 and the symbol Ti. It only occurs naturally as an oxide, but it may be reduced to create a beautiful transition metal that has a silver hue, a low density, and a high degree of strength. It is also resistant to corrosion in sea water, aqua regia, and chlorine.
Therefore, The electronic configuration of titanium is 1s²2s²2p⁶3s²3p⁶4s²3d² or [Ar] 3d²4s²
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What do cations like Na^ + do to fulfill the octet rule?
By losing its one valence electron, a neutral sodium atom is likely to achieve an octet in its outermost shell.
Na→ Na⁺ + e−
To distinguish it from the element, the cation produced in this manner, Na+, is referred to as the sodium ion. The sodium ion's outermost shell is the second electron shell, which contains eight electrons.
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The fact that water expands as much as 9% of its volume as it freezes is the basis of
A. oxidization.
B. exfoliation.
C. salt crystal growth.
D. frost wedging.
E. hydrolysis
The fact of expanding of water as much as 9% of its volume as it freezes is the basis of frost wedging.
Water starts to contract as expected after it is cooled to a temperature of roughly 4 degrees Celsius. Once it hits the freezing point, it continues to grow gradually until it freezes and expands by around 9%.
When water fills a fissure, it freezes, expands (8–11% more volume than liquid water), and this process results in frost wedging. An enormous amount of pressure (up to 30,000 pounds per square inch) is applied to the rock by the growing ice, which causes the crack to widen.
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Which of the following describes an energy transformation from electrical energy to thermal energy?
Answer:
A toaster
Explanation:
It uses electrical energy and converts it to heat.
What is a difference between fission and nuclear decay?
Responses
Fission is a slow, natural process that occurs spontaneously, while nuclear decay is a fast and generally human-induced process.
Fission is a slow, natural process that occurs spontaneously, while nuclear decay is a fast and generally human-induced process.
Fission releases particles, while nuclear decay absorbs particles.
Fission releases particles, while nuclear decay absorbs particles.
Fission involves a change in the nucleus of an atom, while nuclear decay does not.
Fission involves a change in the nucleus of an atom, while nuclear decay does not.
Fission results in products of relatively similar masses, while nuclear decay results in products of very different masses.
Answer:
Fission involves the splitting of the nucleus of an atom into smaller nuclei, while nuclear decay involves the emission of particles from the nucleus of an atom without changing its structure. Fission is usually induced by humans, while nuclear decay occurs naturally. Fission releases energy and particles, while nuclear decay only releases particles. Fission results in products of relatively similar masses, while nuclear decay results in products of very different masses.
Answer:
Fission results in products of relatively similar masses, while nuclear decay results in products of very different masses.
Explanation:
If there was no carbon dioxide in the atmosphere what would happen
Answer:
Photosynthesis won't happen
Temperature of earth will increase and sea level will be increased
Weather changes
Some help on this, please? (Didn't know what topic to put it in, apologies)
The way in which soil aeration affects porosity of soil is described below.
What is soil porosity?Soil porosity is the term used to describe the amount of open space or pore space that can be found between particles of soil.
Soil porosity also determines the amount of oxygen that can be found in pore spaces. In addition to water, plants must have oxygen to grow and thrive.
Aeration is the process by which air is circulated through or mixed with a substance such as soil or a liquid.
One of the primary reasons that plants need pore space is because oxygen gets stored in the pores Therefore, soil porosity is influenced by soil aeration.
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