Answer:
Explanation:
Nitrogen cycle is one of the important biochemical cycle in nature. The element nitrogen is fixed by the soil bacteria which is available in nature in the form of atmospheric nitrogen. The atmospheric nitrogen is absorbed by the soil bacteria which converts it into forms like nitrates and nitrites which are easily absorbed by the plants. The plants use these forms for the synthesis of amino acids. These amino acids are used by the plants to synthesize their proteins.
The plants and their products are the source of proteins which are the building blocks of human body. The proteins are necessary for building up the muscle mass, renew of hair and skin, repair of injured tissues, defense against the injury, foetal development and others. Hence, nitrogen cycle is important for humans.
Answer:The nitrogen cycle, or n cycle, on Earth, is very important as it provides every living thing with what they need to grow. Humans, animals, even plants. Nitrogen is the most abundant source in the atmosphere. It is also the building block of proteins, nucleic acids like DNA, and a very important component of all life.
Explanation:
Identify the Lewis base in this balanced equation: Fe3+ H2O Fe(H2O)63+
Answer:H20
Explanation:
because it is the base that contributes electrons
Answer : The Lewis-base in this reaction is, water [tex]H_2O[/tex]
Explanation :
According to the Lewis acid-base theory,
Lewis acid : It is a substance that can accepts pairs of electrons to form a covalent bond.
Lewis-base : It is a substance that can donates pairs of electrons to form a covalent bond.
The given balanced equation is:
[tex]Fe^{3+}+6H_2O\rightarrow [Fe(H_2O)_6]^{3+}[/tex]
In this reaction, [tex]Fe^{3+}[/tex] ion is Lewis-acid and [tex]H_2O[/tex] is a Lewis-base. The [tex]H_2O[/tex] donates electrons to [tex]Fe^{3+}[/tex] ion to form [tex][Fe(H_2O)_6]^{3+}[/tex].
Hence, the Lewis-base in this reaction is, water [tex]H_2O[/tex]
what is the [OH-] in a solution with a poh of 3.90
Answer: The hydroxide ion concentration is [tex]1.26\times 10^{-4}M[/tex]
Explanation:
pOH is defined as the negative logarithm of hydroxide ion concentration in the solution.
To calculate the pOH of the reaction, we use the equation:
[tex]pOH=-\log[OH^-][/tex]
where,
[tex]pOH=3.90[/tex]
Putting values in above equation, we get:
[tex]3.90=-\log[OH^-][/tex]
[tex][OH^-]=1.26\times 10^{-4}M[/tex]
Hence, the hydroxide ion concentration is [tex]1.26\times 10^{-4}M[/tex]
Answer: 1.26 x 10 -4
Explanation:
Given pH = 6.75,
Is this acidic, basic or neutral?
How do you know?
Answer:
Acidic.
Explanation:
pH is a logarithmic function of [H+]:
pH = −log[H+]
pH is usually (but not always) between 0 and 14. Knowing the dependence of pH on [H+], we can summarize as follows:
If pH < 7, then the solution is acidic.
If pH = 7, then the solution is neutral.
If pH > 7, then the solution is basic.
Given pH is 6.75 so it is acidic.
What do weather and climate have in common?
A. Both affect average ocean temperatures
B. Both are averages measured over a long period of time
C. Both apply to a certain region
D. Both change day to day
Answer:
Both apply to a certain region
Choice C is correct
Explanation:
Weather refers to the atmospheric conditions of a given place over a short period of time, like a day.
On the other hand, Climate refers to the average climatic conditions of a particular region measured over a long period of time.
Both weather and climate apply to a certain region.
What type of matter is 500 grams of silver combined with gold?
Answer:
A Mixture of two elements
Explanation:
What happens to an atom of sulfur (S) if it loses an electron?
Answer:
An atom becomes anion when it gains or loses electrons. The ions that are formed when an atom loses electrons are positively charged because they have more protons in the nucleus than electrons in the electron cloud.
Explanation:
Please mark brainliest and have a great day!
Answer: Sulfur atom will form a cation on loosing electrons.
Explanation:
There are 3 subatomic particles present in an atom. They are: protons, electrons and neutrons.
Protons carry positive charge, electrons carry negative charge and neutrons does not carry any charge.
Any neutral atom has equal number of protons and electrons.
An ion is formed when atom looses or gain electron.
If an atom gains electrons, it will have more number of electrons than protons. Thus, it will carry negative charge and form an anion.
If an atom looses electrons, it will have less number of electrons than protons. Thus, it will carry positive charge and forms a cation.
It is given that sulfur atom looses an electron. So, this atom will have more number of protons than electrons. Thus, it will form a cation.
Hence, sulfur atom will form a cation on loosing electrons.
what is the specific heat of a substance that absorbs 2.5×10^3 joules of heat when a sample of 1.0 ×10^4g of the substance increases in temperature from 10°c to 70°c?
Answer:
0.004167 J/g°C is the specific heat of a substance.
Explanation:
[tex]Q=m\times c\times \Delta T[/tex]
[tex]Q=m\times c\times (T_{2}-T_1)[/tex]
Where:
Q = heat absorbed(positive) or released (negative)
m = Mass of substance
c = specific heat of a substance
[tex]T_1[/tex] = Initial temperature
[tex]T_2[/tex] = Final temperature
We have:
m = [tex]1.0\times 10^4 g[/tex]
c = ? , [tex]T_1=10^oC,T_2=70^oC[/tex]
Q = [tex]2.5\times 10^3 J[/tex]
[tex]2.5\times 10^3 J=1.0\times 10^4 g\times c\times (70^oC-10^oC)[/tex]
[tex]c=\frac{2.5\times 10^3 J}{1.0\times 10^4 g\times (70^oC-10^oC)}[/tex]
[tex]c=0.004167 J/g^oC[/tex]
0.004167 J/g°C is the specific heat of a substance.
When H+ forms a bond with H2O to form he hulydronium ion H3O+, this bond is called a coordinate covalent bond because ?
Answer:
Because both the bonding electrons come from the oxygen atom.
Explanation:
A coordinate covalent bond is formed when both the bonding electrons are coming from the same atom.
Here in the given situation, when H+ forms a bond with the water molecule [tex] H _ 2 O [/tex] to form the hydronium ion [tex] H _ 3 O + [/tex], then it is referred to as a coordinate covalent bond since both the bonding electrons are coming from the oxygen atom.
Answer:
Both the shared electrons come from single atom
Explanation:
Coordinate covalent bond is a type of bond in which both the shared pair of electrons are come from single bond. Whereas in simple covalent bond, sharing electrons come from both the participant atoms.
Coordinate covalent bond is also called dative bond and the atom which share both the electrons are called donar atom.
For a coordinate covalent atom to from, one participant atom should have lone pair of electron and other atom should be deprived of electrons.
In [tex]H_2O[/tex] molecule, O atom has lone pair of electrons while H+ ions has deficiency of electrons, so O atom shares its lone pair of electrons with H+ ions which results in the formation of coordinate covalent bond and forms [tex]H_3O^+ molecules[/tex].
Which of the following statements is true?
An atom consists of protons, electrons, and neutrons.
An atom consists of protons and neutrons.
An atom consists of electrons bonded to one another.
An atom consists of protons bonded to one another.
Answer:
The first option
Explanation:
Answer:
First Question, A, An atom consists of protons, electrons, and neutrons.
Second Question, B, A nucleus consists of protons and neutrons.
Explanation:
What type of solution is formed if 10 g of kclo3 are dissolved in 100g of water at 30
Answer:
Saturated solution.
Explanation:
Kindly see the attached image, the curve with brown line is for KClO₃, and according to the curve at 30 °C the solubility of KClO₃ per 100 g of water is 10 g.So, 10.0 g of KClO₃ forms a saturated solution.
When 10 g of KClO₃ are dissolved in 100 g of water at 30 degrees Celsius, a saturated solution is likely formed because the solubility of KClO₃ increases with temperature and is sufficient to dissolve this amount at 20 degrees Celsius.
The question is referring to the process of dissolving a chemical compound in water, which is a chemistry topic commonly studied in high school. When 10 g of KClO₃ (potassium chlorate) are dissolved in 100 g of water at 30℃, the type of solution that is formed depends on the solubility of KClO₃ at that temperature. Assuming the question implies 30 degrees Celsius, potassium chlorate has a solubility of about 7 g per 100 mL of water at 20℃. Since solubility generally increases with temperature, it's likely that the 10 g of KClO₃ will fully dissolve in 100 g of water at 30℃ to form a saturated solution. If all the solute dissolves, the solution is known as saturated; if the solute does not fully dissolve, any undissolved solute would result in a supersaturated solution if the excess was initially forced to dissolve under different conditions, or an unsaturated solution if there is still room for more solute to dissolve.
pls help!!
Explain the resonance structures for the nitrate ion, NO3−.
Answer:
Resonance structures for the nitrate ion exist because there are more than one Lewis Structures for this ion.
Explanation:
How many bonds in each nitrate ion?
To answer this question, start by considering how many electrons each atom need for an octet.
Each N atom needs three electrons to achieve an octet.Each O atom need two electrons to achieve an octet.The three O atoms and one N atom in each nitrate ion will need [tex]3\times 2 + 3 = 9[/tex] electrons in total to be stable. However, the ion carries a charge of [tex]-1[/tex]. In other words, atoms in the ion have already acquired one extra electron. Now they need only [tex]9 - 1 = 8[/tex] electrons.
Atoms share electrons by forming bonds. In effect, each chemical bond (a pair of shared electrons) adds two electrons to the bonding atoms. Atoms in the nitrate ion will form [tex]8/2 = 4[/tex] chemical bonds.
However, there are only three bonding position available. One of the three positions will see a double bond while each of the other two will see a single bond. However, the double bond can be at any of the three bonding position. There are thus three possible Lewis Structures. See the sketched. Note that the three structures are interconvertible by moving only the electrons but not any atoms. Hence the name resonance structures.
Keep in mind that in reality, the pi electrons from the double bond are delocalized across all three possible bonding positions. All three N-O bonds are of equal length.
We know we are originated from the combination of elements but where did the elements and compound came from. Where did the proton neutron electron or smallest particle came? Then Does god exists?Plz give me a good reason.
A group of students working in a high school chemistry lab believe they have discovered a new element! How exciting? Upon further testing by scientists (with better equipment), it is found that the new element contains 74 protons and 110 neutrons.
What is the atomic number?
What is the mass number?
Is this a new element? Explain.
Give the name and symbol for this element.
Is it solid, liquid, or gas? Explain
Answer:
Explanation:
Information given about the element:
Number of protons = 74
Number of neutrons = 110
For the atomic number:
Neutral atoms such as this one would have their atomic number to be the same with their number of electrons and protons:
atomic number = number of protons = number of electrons
The atomic number would therefore be 74
For the mass number:
The mass of an atom is centrally concentrated within the tiny nucleus. The mass number is the sum of protons and neutrons in an atom. Protons and neutrons are nuclear particles and are called nucleons:
Mass number = number of protons + number of neutrons = 74+110=184
Is this a new element?
From the peroidic table, tungsten(W) perfectly fits this description of the atom. It has an atomic number of 74 and a mass number of approximately 184. The element is not a new element.
Is it solid, liquid, or gas?
The element is a hard metallic solid. It is a classified as a transition metal on the periodic table. Transition metals have very unique metals and are mostly solids.
Answer:
1) The atomic number of this element is 74, because number of protons = atomic number
2) Mass number of this element is 184
Ar=Z+N=74+110=184
3) It isn't a new element. An element with such atomic and mass numbers exists
4) It is Wolfram. Symbol: W
5) Solid
Sorry if I made mistakes. I started learning English recently
An unknown substance is a white solid at room temperature and has a melting point of 78 °C. Which of the following substances is most likely to be the identity of the unknown sample?
A. Naphthalene, a molecular solid with the formula C10H8
B. Silica, a network solid held together by covalent bonds with the formula SiO2
C. Calcium chloride, an ionic compound with the formula CaCl2
D. Water, an molecular compound with the formula H2O
The unknown solid with melting point of 78 degrees Celsius has been the molecular solid Naphthalene with formula [tex]\rm C_1_0H_8[/tex]. Thus, option A is correct.
Melting point has been defined as the temperature that has been able to transfer the solid to the liquid state.
The melting point has been higher for the substances with strong intermolecular interactions, and lower for weak attractive compounds.
Identity of the unknown sampleThe unknown sample has a melting point of 78 degree Celsius.
The molecular compounds have high melting point with strong intermolecular interactions, and ionic and covalent compounds have low melting point with weak intermolecular interactions.
The melting point of water has been zero degree Celsius.
Thus, the unknown solid with melting point of 78 degrees Celsius has been the molecular solid Naphthalene with formula [tex]\rm C_1_0H_8[/tex].
Thus, option A is correct.
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The most likely identity of the unknown white solid with a melting point of 78 °C is naphthalene, a molecular solid with the formula C10H8, commonly used in mothballs.
Explanation:If the unknown substance is a white solid at room temperature and has a melting point of 78 °C, the most likely candidate from the given options would be naphthalene, which is a molecular solid. This substance has the formula C10H8 and is well-known for its use in mothballs. It has a melting point close to the given temperature, whereas the other given substances have significantly higher melting points and different chemical and physical properties.
SiO2, or silica, is a covalent network solid and CaCl2, or calcium chloride, is an ionic compound. Both have melting points that are much higher than 78 °C. Meanwhile, H2O, water, is a molecular compound that is not a solid at room temperature, as it has a melting point of 0 °C. Therefore, option A, naphthalene, is the most likely identity of the unknown solid.
what are the properties of clay soils? check all that apply
1.is loose
2.retains water
3.drains quickly
4.are fine grained
5.have coarse particles
Answer: 2.retains water, 4. are fine grained
Explanation:
Clay is a kind of soil. It exhibit fine grained particles. It retains the organic matter and inorganic minerals. The ability to retain water is because of fine grained size aggregate of clay. As this kind of soil can retain moisture and exhibit minerals it is suitable for the growth of plants.
write the complete equation for the neutralization reactions that take place when the following water solutions are mixed.
1.) KOH(aq) + HF(aq)
2.) HCl(aq) + LiOH(aq)
3.) H2SO4(aq) + NaOH(aq)
A sample of an unknown compound has a percent composition of 52.14% carbon, 13.13% hydrogen, and 34.73% oxygen. Which compounds could
the sample be?
CH3CH3CH202
C2H5OH
C4H10o2
C4h12o2 and ch3ch3ch2ooh
To determine which compounds an unknown sample could be, based on its percent composition, involves calculating the empirical formula from the given percentages and comparing it with the provided compound options.
Explanation:The question involves determining which compounds an unknown sample could be, based on its percent composition of 52.14% carbon, 13.13% hydrogen, and 34.73% oxygen. This requires an understanding of percent composition and the ability to calculate an empirical formula based on the given percentages. Given the complexity of the sample compositions and potential empirical formulas, it's essential to evaluate each option through stoichiometric calculations and compare their empirical formulas derived from the provided compositions to the actual compounds mentioned.
Explain why HCl (aq) cannot be used to acidify KMnO4 (aq) while ur can be used to acidify K2Cr2O7 (aq).
Answer:
HCL being a strong electrolyte dissociates in water to give H+ and Cl- ions. KMnO4 being a strong oxidising agent oxidises Chloride ion(Cl-) to Cl2. ... Hence more amount of KMnO4 is usedup which results in error in reading. The situation is completely the opposite with K2Cr2O7.
hope this helps
Determine the enthalpy change of the following reaction: 2KClO3 -> 2KCl + 3O2
Given enthalpies:
KClO3: -391.4 kJ/mol
O2: 0 kJ/mol
KCl: -436.7 kJ/mol
Answer:
- 90.6 kJ/mol.
Explanation:
The enthalpy change of the reaction (ΔHrxn) is the difference between the sum of heat of formation of products and reactants.ΔHrxn = ∑ΔHf(products) - ∑ΔHf(reactants)
For the reaction: 2KClO₃ → 2KCl + 3O₂,
∴ ΔHrxn = ∑ΔHf(products) - ∑ΔHf(reactants)
∴ ΔHrxn = [(2*ΔHf(KCl)) + (3*ΔHf(O₂))] - [(2*ΔHf(KClO₃))] = [(2*(- 436.7 kJ/mol)) + (3*(0)] - [(2*(- 391.4 kJ/mol)] = [- 873.4 kJ/mol] - [- 782.8 kJ/mol] = - 90.6 kJ/mol.
The enthalpy change of the reaction 2KClO3 -> 2KCl + 3O2 is calculated by subtracting the sum of the enthalpies of the reactants from the sum of the enthalpies of the products. The calculation results in an enthalpy change of 90.6 kJ, meaning the reaction is endothermic.
Explanation:The enthalpy change of the reaction can be calculated by subtracting the sum of the enthalpies of the reactants from the sum of the enthalpies of the products. This is also known as Hess's law.
In this reaction, the reactants are 2 moles of KClO3 and the products are 2 moles of KCl and 3 moles of O2. Hence, the enthalpy of the reaction can be calculated as follows:
Enthalpy change = [2 * (-391.4 kJ/mol)] - [2 * (-436.7 kJ/mol) + 3 * 0 kJ/mol]
= (-782.8 kJ) - (-873.4 kJ)
= 90.6 kJ
Therefore, the enthalpy change of this reaction is 90.6 kJ. If the enthalpy change is positive, the reaction is endothermic meaning it absorbs heat from the surroundings.
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A potassium ion can combine with several monatomic and polyatomic ions to form compounds.
An example of a potassium compound containing both ionic and covalent bonds is ___, and an example containing only ionic bonds is ___
(plato pre:chemical bonding )
Final answer:
Potassium nitrate (KNO3) contains both ionic and covalent bonds within the compound, while potassium sulfate (K2SO4) is an example of a compound containing only ionic bonds.
Explanation:
An example of a potassium compound containing both ionic and covalent bonds is potassium nitrate (KNO3), and an example containing only ionic bonds is potassium sulfate (K2SO4).
Potassium nitrate is composed of potassium ions (K+) and nitrate ions (NO3−), with the nitrate being a polyatomic ion held together by covalent bonds between nitrogen and oxygen atoms. This compound demonstrates ionic bonding between potassium and nitrate ions, as well as covalent bonding within the nitrate ion itself.
On the other hand, potassium sulfate is made up of potassium ions (K+) and sulfate ions (SO42−). This compound is purely ionic, with the bonds forming from the electrostatic attraction between the positively charged potassium ions and the negatively charged sulfate ions.
Elements that form ionic bonds generally have how many valence electrons? ± 1 or ± 2 ± 2 or ± 3 ± 4 ± 5
Answer:
± 1 or ± 2
Explanation:
Electrovalent bonds are chemical bonds that are established on the premise of transferring electrons between two atoms.
In this bond type, a higly electronegative atom, typically a non-metal receives electrons from an atom with lesser electronegativity, a metal.
To know the number of electrons involved in forming electrovalent bonds, we typically look at the groups of atoms that combines to form the bond.
Metals are found in group I and II on the periodic table. Metals are electropositive and are good electron donors. These metals have 1 and 2 electrons in their valence shell respectively. In like manners, the more electronegative atoms are found in group VI and VII. The elements in these groups are non-metals with high electronegativity and requires just 1 and 2 electrons to complete their octet.
Answer:
± 1 or ± 2
Explanation:
Mercury-203 undergoes beta minus decay. 203 80 Hg → 203 81 Tl + ? The subatomic particle produced is a(n) . 203 80 Hg → 203 81 Tl + 0 -1 e Is this the correct balanced equation? .
Answer:
A negative beta particle
Yes
Explanation:
The incomplete equation of the reaction:
²⁰³₈₀Hg → ²⁰³₈₁Tl + ?
In order to balance nuclear equations, we must conserve the mass number and atomic number.
For the mass number; 203 = 203 + a
a = 0
Atomic number; 80 = 81 + b
b = -1
The unknown has no mass number but an atomic number of -1
This a negative beta particle and it is designated as ⁰₋₁e
Answer:
1) Electron
2) Yes
Absalon adds 1 g of salt to 1 L of room temperature water (25 °C). Then, he starts a timer and observes what happens. He notices that it takes 1 minute for the salt to dissolve. He decides to repeat his experiment, and he adds 1 g of salt to another 1 L of room temperature water (25 °C). After he adds the salt, he starts a timer. But, instead of watching the salt dissolve, he stirs the salt and water with a spoon until it dissolves. He notices that it only takes 30 seconds for the salt to dissolve in his second experiment.
Why does the salt dissolve faster in Absalon's second experiment?
Stirring the salt and water increases the polarity of the water molecules, which causes the ionic bonds of the salt to break.
Stirring the salt and water increases particle motion, which causes more collisions to occur between the water and salt.
Stirring the salt and water increases the surface area of the water, which causes more collisions to occur between the water and salt.
Stirring the salt and water increases the pressure on the solution, which causes the ionic bonds of the salt to break.
Answer:
B
Explanation:
I looked it up and found the answer lol
Answer: Option (b) is the correct answer.
Explanation:
When Absalon stirred the solution which is containing salt in water then there will occur disturbance into solution due to stirring.
As a result, particles will come in motion and hence, they tend to gain more kinetic energy. Due to which there will be more number of collisions between the solute (salt) and solvent (water) particles.
Hence, rate of reaction will increase and because of this salt will readily dissolve into water.
Thus, we can conclude that the salt dissolve faster in Absalon's second experiment because stirring the salt and water increases particle motion, which causes more collisions to occur between the water and salt.
What is a scientific theory?
A. A scientist's guess about how something works
B. The results of an experiment obtained using the scientific method
c. A proven fact that will never change
D. An idea that is backed by data from many sources
The scientific theory is "an idea that is backed by data from many sources".
What is scientific theory?A scientific theory would be a justification for a feature of the natural world as well as the universe that already has undergone repeated testing and confirmation through using established procedures for observation and measurement but also outcome from evaluation.
What is source?The source would be defined as the origin of somebody else.
Therefore, the scientific theory is "an idea that is backed by data from many sources".
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Fission of uranium-235 products energy and ______
A. isotopes of smaller elements
B. isotopes of larger elements C. lighter isotopes of uranium D. heavier isotopes of uranium
Answer:
A
Explanation:
During fission, heavier unstable atoms are split into lighter and more stable atoms with the release of energy. Fission of Uranium-235 produces Barium and Krypton (which are lighter and more stable atoms) and neutrons. Barium has an atomic mass of 141 while that of Krypton is 92.
Answer:
a
Explanation:
As a temperature of a fixed volume of a gas increases, the
pressure will what?
As a temperature of a fixed volume of a gas increases, the
pressure will also “INCREASE”
What is scientific law how does a hypothesis become a law
Answer:
In general, a scientific law is the description of an observed phenomenon. It doesn't explain why the phenomenon exists or what causes it. The explanation of a phenomenon is called a scientific theory. It is a misconception that theories turn into laws with enough research.
Explanation:
Answer:
A scientific law is a description of an observed phenomenon.this is not an explanation of a phenomenon but a description.
Hypothesis becomes a law when they follow a line of reasoning and formulate a theory.then once a theory has been evaluated through a series of testing it becomes a law.
Hope this helps and if it does pls mark as brainliest answer
How does temperature affect the Keq of a reaction?
Answer:
D. Changing the temperature will change Keq.
Explanation:
The equilibrium constant expresses the relationship between the molar concentration of reactants and products. This constant is the Keq. It is temperature dependent and constant at a given temperature.
A change in temperature of an equilibrium system shifts the system to a new equilibrium point. A rise in temperature shifts the equilibrium position to the direction that absorbs heat and vice versa.
In summary, a shift in equilibrium which results from temperature change is actually a change in value of the equilibrium constant.
Answer: D. changing the temperature will change the K eq
Explanation:
How does science use models to gain a better understanding of concepts?
Answer:In science, a model is a representation of an idea, an object or even a process or a system that is used to describe and explain phenomena that cannot be experienced directly. Models are central to what scientists do, both in their research as well as when communicating their explanations.
Explanation:
Can someone help me with 1 to 8 ? I will mark you Brainliest.
Answer:
1. scientist
2. society
3. We can communicate to people across the world in a fraction of a second, our grandparents would've had to pay an extra fee to call anyone outside of the country. We've also made progress in medicine, making diseases like cancer more treatable.
4. Passion, determination, and intelligence.
5. You could ask yourself what factors do the other trees have that the unhealthy tree not have and then create an experiment as to how the variable missing from the unhealthy tree affects plants.
6. Life science was affected by each of these branches.
7. Investigations take a long time because of observations, forming hypothesis, creating an experiment and analyzing the data and then revizing the experiment and the hypothesis. This can take years and cannot be limited to one year.
8. The contributions of these scientists are absolutely still valuable, without these contributions many of the things we know in the modern world wouldn't be known today. Such as the types of organelles and their functions, the periodic table, and the importance of oxygen for human beings.
Explanation: