Answers
Advances in modern agriculture allow today's farmers to grow in ways that are measurably more sustainable. These practices help farmers retain topsoil and reduce erosion, conserve water in multiple ways, reduce emissions, protect pollinators, and protect natural resources by using farmland more efficiently. Industrialized agriculture is highly concentrated and mechanized, relying on chemical inputs like fertilizers, pesticides and non-therapeutic antibiotics. Agriculture often places significant pressure on natural resources and the environment.
Related Questions
The human body contains many elements from the periodic table. It is mostly composed of oxygen and carbon, but trace
elements also have a significant role. The table gives the mass, in kilograms, of some elements found in the human body, based
on a 70.0 kg person.
Atomic number
Element
Mass (kg)
8
oxygen
45.2
6
carbon
12.6
1
hydrogen
7.0
7
nitrogen
2.2
20
calcium
1.3
15
phosphorus
0.78
19
potassium
0.25
16
sulfur
0.18
others
0.60
total
70,0
Potassium makes up what fraction of the mass of the human body?
Answers
From the question given above, the following data were obtained:
Oxygen = 45.2 Kg
Carbon = 12.6 Kg
Hydrogen = 7 Kg
Nitrogen = 2 Kg
Calcium = 1.3 Kg
Phosphorus = 0.78 Kg
Potassium = 0.25 Kg
Sulphur = 0.18 Kg
Others = 0.60 Kg
Total = 70 Kg
Fraction of potassium =?We can obtain the fraction of potassium of the mass of the body as follow:
Potassium = 0.25 Kg
Total = 70 Kg
Fraction of potassium =?Fraction of potassium = mass of potassium / Total
Fraction of potassium = 0.25 / 70
Fraction of potassium = 1/280Therefore, the fraction of potassium in the body is 1/280
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Stoichiometry DBA
1. 33 grams of Calcium Sulfate reacts with 28 grams of Aluminum Phosphate to form Calcium
phosphate and Aluminum Sulfate
Write balanced equation here -
2. Which of the two reactants will limit the production of Calcium Phosphate. Show work here.
3. How much of the Aluminum Sulfate would be produced? Show work here. 4. 44 grams of Zinc Nitrate reacts with 59 grams of Iron(III) Hydroxide to form Zinc Hydroxide
and Iron(III) Nitrate.
Write balanced equation here -
5. Which of the two reactants will limit the production of Iron(III) Nitrate . Show work here.
6. How much excess reactant will you have left over?
Answers
Answer:
Ca3(PO4)2..... the formula for Calcium phosphateYou are baking cookies in the oven.
If the system is your cookies, is the system exothermic or endothermic?
O a Exothermic
Ob Endothermic
Answers
What is the name of Earth's home galaxy?
The Milky Way
The Elliptical
The Spiral Way
The Irregular
100 points
Answers
Answer:
The Milky Way
Explanation:
Answer:
Your answer is the Milky WAy!
Brainliest?
Give the formula of Plaster of Paris And some of its uses..
:))
Answers
10. When dissolved in water, most Group 1 metal salts can be described as
strong electrolytes.
strong acids.
weak electrolytes.
A
B
C
D
non-electrolytes.
(1)
Answers
When dissolved in water, most Group 1 metal salts can be described as strong electrolytes.
When Group 1 metal salts are dissolved in water, they can be described as strong electrolytes. This is because Group 1 metals, such as lithium (Li), sodium (Na), potassium (K), and so on, readily lose their outermost valence electron to form positive ions (cations). These cations then dissociate completely in water, separating from the anions to which they were originally bonded.
The dissociation of Group 1 metal salts in water results in the formation of positively charged metal ions and negatively charged non-metal ions (anions). These ions are free to move and conduct electric current, making the solution a good conductor of electricity. The complete dissociation of Group 1 metal salts in water and the presence of freely moving ions make them strong electrolytes.
Strong electrolytes are substances that ionize completely or almost completely in solution, producing a high concentration of ions. This is in contrast to weak electrolytes, which only partially ionize and produce a lower concentration of ions.
In summary, when Group 1 metal salts are dissolved in water, they form strong electrolytes due to their ability to dissociate completely into ions, leading to a high concentration of freely moving ions in the solution, thus enabling efficient electrical conductivity.
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If 0.089 grams of KI is dissolved in 500g of H2O, what is the concentration of the resulting solution in parts per million?
Answers
Answer:
The concentration of the resulting solution in parts per million is 177.97
Explanation:
Parts per million (ppm), is a unit of measure for concentration that refers to the number of units of the substance per million units of the set.
The concentration in parts per million expressed in mass / mass is calculated by dividing the mass of the solute (ms) by the mass of the solution (md, sum of the mass of the solute and the mass of the solvent), both expressed in the same unit and multiplied by 10⁶ (1 million).
\(ppm=\frac{ms}{md} *10^{6}\)
So, being:
ms: 0.089 grams of KImd: 0.089 grams of KI + 500 grams of H₂O= 500.089 gramsReplacing:
\(ppm=\frac{0.089 grams}{500.089 grams}*10^{6}\)
ppm= 177.97
The concentration of the resulting solution in parts per million is 177.97
Q 1 The pie graph shows the abundance of the two kinds of silver atoms found in nature. The more abundant isotope has an atomic mass of a little less than 107, but the average atomic mass of silver on the periodic table is about 107.9. Explain why it is higher.
Answers
It is higher because The atomic mass 107.9 represents the average of both isotopes present with their abundance taken into account.
What should you know about the atomic mass of the isotope?The average atomic mass of an element is calculated by taking the weighted average of the atomic masses of its isotopes, where the weights are the relative abundances of the isotopes.
Evn though the more abundant isotope of silver has an atomic mass of less than 107, the presence of a heavier isotope of silver, though less abundant, contributes to increase the average atomic mass to about 107.9.
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why does lead exist in a higher amount in brown algae than plankton?
Answers
Lead levels in plankton and algae are high, mostly as a result of environmental pollution brought on by human activity. While it is true that some brown algae species have the ability to accumulate heavy metals like lead.
Plankton and algae have high levels of lead, mostly as a result of environmental contamination brought on by human activities including mining, industrial operations, and the burning of fossil fuels.
Due to the fact that plankton and algae take up trace quantities of lead from the surrounding water, their tissues contain greater concentrations of the metal.
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What does a chemical reaction tell us?
Answers
Answer:
A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products. The properties of the products are different from those of the reactants.
I hope this helps.
THIS IS SIENCE BUT THEY DIDNT HAVE A SCIENCE OPTION!!!
I need this right now btw .
“ DNA is a nucleic acid. Where is DNA primarily found in an animal cell? “
Answers
Answer:DNA, along with RNA and proteins, is one of the three major macromolecules that are essential for life. Most of the DNA is located in the nucleus, although a small amount can be found in mitochondria (mitochondrial DNA). Within the nucleus of eukaryotic cells, DNA is organized into structures called chromosomes.
Explanation: science
which among the materials have a varying amount of components are they compounds or mixtures
Answers
Answer:
Matter can be broken down into two Zalo categories: pure substances and mixtures. Pure substances are further broken down into elements and compounds. Mixtures are physically combined structures that can be separated into their original components.
The following two organic compounds are structural isomers to each other. Carefully identify and justify the structural isomers type (skeletal, functional, or positional) with their common molecular formula
Answers
Structural isomers are molecules with the same molecular formula but with different structural formulae. This means that they have the same number and types of atoms, but they are arranged differently. The following two organic compounds are structural isomers of each other.
Carefully identify and justify the structural isomers type (skeletal, functional, or positional) with their common molecular formula.Common molecular formula: C6H14Structural isomers:(i) Hexane: Hexane is a straight-chain alkane with six carbon atoms and no double bonds or rings. The carbon atoms are linked together in a linear or straight-chain configuration in the skeletal isomer. The skeletal isomer differs in terms of the arrangement of atoms in its molecule. This indicates that it is a skeletal isomer.(ii) 2-methylpentane: It is a branched-chain alkane with six carbon atoms and no double bonds or rings. It differs from the first molecule in terms of the location of a methyl group on the second carbon of the five-carbon chain, rather than a straight six-carbon chain. This difference is due to a change in the positioning of the carbon atoms in the molecule. As a result, it is a positional isomer, as it differs by the position of the functional group or substituent. Therefore, the skeletal and positional isomerism types are present between these two compounds.For such more question on molecular
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HELP Which type of light is stored energy?
A. Kinetic
B. Potential
C. Thermal
D. Field
Answers
Answer:
B
Explanation:
Answer:
Potential
Explanation:
Please help me
*science *
Answers
Answer: Solar energy
Explanation:
Solar energy because it has more clear and sunny skys
Hello there!
An alternative energy source that is best for Coalville is wind energy.
The first two options, solar power and hydroelectric power aren't very good options since solar power requires lots of sun and they only receive 70 days of sun. While, hydroelectric power isn't a good choice either since it is a small stream meaning very little water and not big enough to build a dam on.
Therefore, wind energy is the best idea since high wind speeds are good to spin the wind turbines. The faster the wind the more energy is produced. Coalville has an average windspeed of 20 mph which is quite fast so that will the best option.
A photon of red light has wavelength 750 nm, a photon of
green light has wavelength 615 nm and a photon of violet light
has wavelength 420 nm. Which of the following radiations
has/have higher frequency?
Answers
Answer:
violet light
Explanation: ck12 says so
Which physical property allows iron to be easily separated from most other materials
Answers
The physical property that allows iron to be easily separated from most other materials is magnetism.
Metals that naturally attract magnets are known as ferromagnetic metals. These magnets tend to firmly stick to these metals. For example when you rub a piece of iron along a magnet the north seeking poles of the atoms get lined up in one direction. This causes a force to build up a force and this force creates a magnetic field. This is how a piece of iron becomes a magnet.
To explain the magnetism of iron we can take example iron present in sand, it was seen that the iron filings are attracted to the magnet and the sand is not. This allowed us to separate the iron filings from the sand.
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What would you expect to observe when Br2 reacts with 2-butyne?
Answers
Answer:
I expect to observe a change in colour from reddish brown to a colourless solution
Explanation:
Bromine (Br2) attacks the electron rich carbon-carbon triple bond in but-2-yne, an alkyne to form an initial product 2, 3 dibromobut-2-ene; which reacts with excess bromine to form a final product 2,2,3,3 -tetrabromobutane.
The reaction occurs in two steps. On approaching but-2-yne, bromine molecule becomes polarised forming an induced dipole containing a bromonium ion.
Br - Br → Br+ - Br-
The bromonium ion (Br+) formed then attacks the carbon - carbon triple bond to form the initial product
2,3- dibromobut-2-ene
CH2-C≡C-CH2 + Br+ →
CH2 - CBr =CBr-CH2
(2,3- dibromobut-2-ene)
Which in the presence of excess bromine gives the final product
2,2,3,3 - tetrabromobutane.
CH2 - CBr =CBr-CH2 + Br2 →
CH3 -CBr2-CBr2 - CH3
2,2,3,3 - tetrabromobutane.
A visible change in colour from the reddish-brown colour of Bromine to a colourless solution is observed during the reaction.
An obligation to do something or control over or care for someone.
Answers
Answer: a responsibilty
Explanation:
An obligation to do something or control over or care for someone. The word suitable for it is "responsibility".
An obligation is a duty or responsibility to do anything that is required by law, custom, or moral standards.
Responsibility is an obligation to do something or control over or care for someone. It is a duty or task that one is required to undertake.
Responsibility can be of different forms, such as personal, social, or professional.
Personal responsibility refers to the responsibility that an individual has for their own actions and decisions.
Social responsibility refers to the responsibility that an individual or organization has to act in the best interest of society.
Professional responsibility refers to the responsibility that individuals have to perform their job duties to the best of their ability.
Therefore, the term most suits for the given statement is "responsibility".
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A certain second-order reaction (B products) has a rate constant of 1.45x10^-3 M^-1•s^-1 at 27°C and an initial half-life of 228 s. What is the concentration of the reactant B after one half-life?
Answers
The concentration of reactant B after one half-life is equal to 1.512M.
What is the second-order reaction?A reaction is said to be a second-order reaction when the overall order of the reaction is equal to two. Suppose the reaction can be represented as follows:
A + A → P
The rate of second-order reactions can also be written as r = kA²
The term k'' is the rate constant for the second-order reaction and the unit of the reaction rate (r) is moles per liter per second (molL⁻¹s⁻¹) and the unit of the second-order rate constant is M⁻¹s⁻¹.
The half-life of the second-order reaction is:
\(t_{\frac{1}{2} } = \frac{1}{B_oK}\)
where B₀ is the initial concentration of reactant B.
Given the rate constant of the 2nd order reaction, k = 1.45× 10⁻³M⁻¹s⁻¹
The half-life of the reaction, \(t_{\frac{1}{2} } = 228 sec\)
B₀ = 1/ (1.45× 10⁻³) × 228
B₀ = 3.025M
The concentration of the reactant B after one half-life = B₀/2 = 1.512 M
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lonic Formulas - Problems
Which of the following would form a +2 ion? Select all that apply.
atom A
atom B
atom C
atom D
atom E
A
B
C
D
E
2
He
10
Ne
18
Ar
36
Kr
Xe
86
Rn
Submit your answer
Answers
Atom B would form an ion that has a charge that can be designated as + 2.
What is an ion?An ion is an atom or molecule that has gained or lost one or more electrons, resulting in a net electric charge. Atoms typically have an equal number of electrons and protons, which gives them a neutral charge.
We can see that atom B belongs to group 2 of the periodic table and that the atoms that we find in this group are able to loose two electrons and thus they would form an ion that has a charge of + 2.
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The sun, the moon, the stars, the earth all are made up of 4) Symbol 2) Mixture 3) Matter 1) Material
Answers
The sun, the moon, the stars, the earth all are made up of matter.
Matter refers to anything that has mass and occupies space. It is the substance that makes up all physical objects in the universe, including both living and non-living things. Matter can exist in different states, namely solid, liquid, and gas, depending on the arrangement and movement of its particles. Matter is composed of atoms, which are the smallest units of matter that retain the chemical properties of an element. Atoms combine to form molecules, which can be made up of one or more different types of atoms bonded together. These molecules then come together to form different substances.
The properties of matter, such as its density, color, texture, and ability to conduct heat or electricity, are determined by the composition, arrangement, and interactions of its particles. Matter can undergo physical and chemical changes, including phase transitions (such as melting, freezing, and vaporization) and chemical reactions, where substances can be transformed into new substances with different properties. It is important to note that matter also includes forms that are not directly visible to the eye, such as subatomic particles
The sun, the moon, the stars, and the Earth are all made up of matter. Matter refers to anything that has mass and occupies space. It is composed of atoms and molecules, which are the building blocks of all substances. While symbols can represent or signify various concepts or objects, they are not physical entities made up of matter. A mixture is a combination of two or more substances, but it does not encompass celestial bodies like the sun, moon, stars, or Earth. Material is a more general term that can refer to various physical substances, but it does not specifically indicate the composition or nature of celestial bodies.
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Classify the substances according to the strongest solute-solvent interaction that will occur between the given substances and water during dissolution
Answers
FeBr₃: Ion-Dipole Forces
Iron (III) bromide is a soluble salt in water. When dissolved it will from its ions (Fe+3 and Br-). So the strongest solute-solvent interaction between it and water is Ion-Dipole forces.
AlCl₃: ?
HF: Hydrogen Bonding
HF can interact with water producing Hydrogen Bonding.
Ethanol: Hydrogen Bonding
Presents dipole-dipole forces, hydrogen bonding and London Dispersion Forces. Dipole-dipole because of the oxygen and hydrogen bonding because of the OH.
What are the charges of the ions in an ionic compound containing cobalt(III) and fluoride ions?
Write the formula for the compound.
Answers
The charge on the ions in an ionic compound containing cobalt(III) and fluoride ions is Co³⁺ and F⁻¹ and the formula of the compound is CoF₃.
Ionic compounds are a type of chemical compound where the oppositely-charged ions of a metal and a nonmetal are attracted to each other to form an ionic bond.
The compound formed from the bonded ions will have very different properties from the elements that make up the compound.
While atoms are neutral because they have an equal number of protons and electrons, ions have a net charge and result when an atom loses or gains electrons.
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moves.
whats the meaning
Speed ?
and the
meaning of
of Motion?
Hurry I have 15 minutes please help
Answers
Answer:
Speed: The rate at which someone or something is able to move or operate. Motion: The action or process of moving or being moved.
Explanation:
I pretty much explained it in the answer, have a good one!
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What is the number of molecules of NO, which contains 16 gm of oxygen. 14
Answers
To find the number of molecules of NO that contains 16 g of oxygen, we need to first calculate the number of moles of oxygen in 16 g of oxygen. Using the atomic weight of oxygen (16 g/mol), we can calculate:
moles of O = mass of O / atomic weight of O = 16 g / 16 g/mol = 1 mol
Next, we need to determine the number of moles of NO that contains 1 mol of oxygen. From the molecular formula of NO, we can see that 1 mol of NO contains 1 mol of oxygen. Therefore, the number of moles of NO that contains 1 mol of oxygen is also 1 mol.
Finally, we can use Avogadro's number to convert the number of moles of NO to the number of molecules of NO. Avogadro's number is approximately 6.02 x 10^23 molecules/mol. Therefore, the number of molecules of NO that contains 16 g of oxygen is:
number of molecules of NO = number of moles of NO x Avogadro's number
number of molecules of NO = 1 mol x 6.02 x 10^23 molecules/mol
number of molecules of NO = 6.02 x 10^23 molecules
Therefore, there are approximately 6.02 x 10^23 molecules of NO that contain 16 g of oxygen.
Write a scientific explanation on how food from plants provide energy for body processes.
Claim:
Evidence:
Reasoning:
Answers
Answer:
Explanation:
Which activity removes a large amount of alcohol from the body
Answers
Which activity removes a large amount of alcohol from the body? After alcohol has been consumed and reaches the bloodstream, up to 10% of the alcohol is disposed of through the urine, and 80% to 90% by oxidation in the liver. The average drinker eliminates about 2/3 of a standard drink unit (a shot) per hour.
The question is a 3 part question. I need help with the calculations. Thank youPART A
Answers
Answer: 30.6g of KClO3 corresponds to 0.249 moles of this compound.
Explanation:
The question requires us to calculate the number of moles that correspond to 30.6 g of potassium chlorate (KClO3).
To determine the number of moles of KClO3, first we need to calculate the molar mass of this compound.
Considering the atomic masses given by the question (K = 39.1 g/mo, Cl = 35.4 g/mol and O = 16.0 g/mol), we can calculate the molar mass of KClO3 as:
\(molar\text{ mass KClO}_3=1\times39.1+1\times35.4+3\times16.0=122.5g/mol\)Therefore, the molar mass of KClO3 is 122.5 g/mol.
Next, we need to convert the mass given, 30.6g, to the number of moles, using the molar mass of KClO3:
\(number\text{ of moles = 30.6g KClO}_3\times\frac{1}{122.5g/mol\text{ KClO}_3}=0.249mol\text{ KClO}_3\)Therefore, 30.6g of KClO3 corresponds to 0.249 moles of this compound.
4. The volume of a liquid sample is measured as 15.43 L. We need to know the volume in
mL.
3.
b.
What conversion factor would be used in the calculation?
Calculate the volume in mL.
Answers
Conversion factor used to convert volume is 1L = 1000 mL.
15.43L = 15430mL
The same attribute is expressed using a unit conversion but in a different unit of measurement. For instance, time can be expressed in minutes rather than hours, and distance can be expressed in kilometers, feet, or any other measurement unit instead of miles. Measurements are frequently offered in one set of units, like feet, but are required in another set, like chains. A conversion factor is a mathematical equation that facilitates an equal exchange of feet for chains.
A conversion factor is a number that is used to multiply or divide one set of units into another. If a conversion is required, it must be done using the correct conversion factor to get an identical value.
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