To solve this we must be knowing each and every concept related to mole and and its calculations. Therefore, 1.17×10²⁴particles are in 176 grams of Fe(OH)[tex]_2[/tex].
What is mole?A mole is merely a measuring unit. In reality, it is one of International System of Units' seven foundation units (SI). When basically determines are insufficient, new units are created.
Chemical reactions frequently occur at levels that use grams would be inappropriate, but using actual figures of atoms/molecules/ions would also be misleading.
It's much easier to write' mole' than '6.02x10²³' whenever you wish to refer to a huge number of things. That is essentially why and how this particular component was created.
mole =given mass ÷ molar mass
given mass of Fe(OH)[tex]_2[/tex] =176 grams
Molar mass of Fe(OH)[tex]_2[/tex] =89.8g/mol
number of moles=176/ 89.8
=1.95moles
number of molecules=1.95moles ×6.022×10²³
=11.7
=1.17×10²⁴particles
Therefore, 1.17×10²⁴particles are in 176 grams of Fe(OH)[tex]_2[/tex].
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A positively charged sphere A is brought close without touching to a neutral sphere B. Sphere B is touched with a grounded wire. What is the charge on sphere B after the wire is removed?
The contact of the charged aluminum plate with the neutral metal spherical causes it to become charged.
What occurs when two spheres with different charges come into contact?Contact between a charged object and a neutral object constitutes charging by conduction. Consider touching a neutral metal sphere with an aluminum plate that is positively charged. The contact of the charged aluminum plate with the neutral metal spherical causes it to become charged.The positive charges on a positively charged conducting sphere will migrate in the direction of the uncharged conducting sphere when it is brought close to (but not touching) an uncharged conducting sphere (that is, one with no excess charge).The contact of the charged aluminum plate with the neutral metal spherical causes it to become charged.To learn more about spheres refer to:
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lithium, cesium, potassium, sodium, rubidium place the elements above in order from smallest atomic radius to largest atomic radius: place the elements above in order from smallest ionization energy to largest ionization energy: place the elements above in order from smallest electronegativity to largest electronegativity:
Smallest atomic radius to largest atomic radius: sodium, potassium, rubidium, cesium, lithium
What is atomic radius?
Atomic radius is a measurement of an atom's size. It is usually determined by the distance between the nucleus and the outermost electron shell of an atom. Atomic radius is measured in picometers (pm), which is one trillionth of a meter. Generally, the larger the atomic radius, the larger the atom.Atomic radius is related to the element's atomic number, which is the number of protons in the nucleus of an atom.
Smallest atomic radius to largest atomic radius: sodium, potassium, rubidium, cesium, lithium
Smallest ionization energy to largest ionization energy: sodium, potassium, rubidium, lithium, cesium
Smallest electronegativity to largest electronegativity: sodium, potassium, rubidium, lithium, cesium
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which of the following structures are meso compounds? b, d and e only a and e only d and e only b only
B and D parts are Meso compounds from the structures attached below.
Meso compounds need to contain two or more chiral centers and a symmetry plane that splits the molecule in half. We can only refer to a chemical as a meso compound if it can meet these two requirements.
Part-A-The questioned chemical lacks a plane of symmetry yet contains three chiral centers. It is not a meso compound as a result.
Part-B-In this instance, the molecules have a plane of symmetry and three chiral centers. It is a meso compound as a result.
Part-c-Three chiral centers are present in this chemical, however the symmetry plane is not present. It is not a meso compound as a result.
Part-D-Three chiral centers and one plane of symmetry may be found in this chemical. It is a meso compound as a result.
Part-E-The provided molecule is not a meso compound since it lacks a plane of symmetry.
Part-F-In this instance, a plane of symmetry exists, but there is only one chiral center. It is not a meso compound as a result.
complete question:attached below.
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A mass is recorded as 15.02 g. Given the accepted level of uncertainty in any recorded measurement, select the range in which this mass will fall.O 15.01 - 15.03 gO 15.00 - 15.10 g O 14.92 - 15.12 g O 14.95 - 15.05 g
A mass is recorded as 15.02 g. Given the accepted level of uncertainty in any recorded measurement, The correct answer is 15.01 - 15.03 g.
The accepted level of uncertainty in any recorded measurement is typically given as the number of significant figures in the measurement. In this case, the mass is recorded as 15.02 g, which has three significant figures. This means that the true value of the mass could be anywhere within ±0.01 g of the recorded value. Therefore, the range in which this mass will fall is 15.01 - 15.03 g.
Option-15.00 - 15.10 g is not correct as it is greater than ±0.01 g
Option-14.92 - 15.12 g is not correct as it is greater than ±0.01 g
Option-14.95 - 15.05 g is not correct as it is not including the recorded value 15.02g
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in the following images, a blue circle represents an atom of one type of element, and a red square represents an atom of a second type of element. determine which of them represent a pure substance, a homogenous mixture, and a heterogeneous mixture.
In the given images structure 1 represents pure element, structure 2 represents heterogenous and structure 3 represents homogenous structure, respectively.
A Pure element is a structure that is made up of only one kind of particle. Homogenous mixture is a mixture that contain same proportion of its components while heterogenous mixture is a mixture that contains unequal proportion of the component.
Given, blue circle represents an atom and red square represents an atom of second type of element.
In the structure given in 1st, half part of sphere contains blue atom and another half contain another type of atom(red). Thus, the structure is an example of pure element.
In the 2nd structure, Blue and Red elements are mixed together in an unequal amount in a sample. Thus, it is an example of heterogenous structure.
In 3rd structure, number of two type of atoms are same. Thus, it is an example of homogenous structure.
Therefore, the provided structure represents pure element, heterogenous structure, and homogenous structure, respectively.
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If 25.0 grams of water at 100°C are heated at a constant rate of 400.0 joules/minute, calculate the time needed
to vaporize the sample completely. SHOW WORK.
I need help please
If 25.0 grams of water at 100°C are heated at a constant rate of 400.0 joules/minute, 56425J needed to vaporize the sample completely.
What is vaporization?
The process of converting a substance from its liquid or solid state into its gaseous (vapor) state is known as vaporization. Boiling is the process of vaporizing a liquid when the environment permits the development of vapor bubbles inside the liquid. Sublimation is the direct transformation of a solid into a vapor.
What is grams?
The gram is a unit of mass in the International System of Units (SI) that is equal to one thousandth of a kilogram. It was originally known as the gramme. Gram. This pen cap weighs around one gram.
Amount of heat required to convert 25g of water at 100°
C to 25g of steam at 100°
C =25×2257J=56425J
Therefore, If 25.0 grams of water at 100°C are heated at a constant rate of 400.0 joules/minute, 56425J needed to vaporize the sample completely.
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The balanced equation for the decomposition of sodium bicarbonate is 2NaHCO3(s) ---> Na2CO3(s) +H2O(g) +CO2 (g),ΔH
=129.2.
Using the enthalpies of formation, calculate the enthalpy of formation of sodium bicarbonate.
Because of this, it is calculated that -1013 kJ/mol is required to produce NaHCO3 N a H C O 3 from its component elements.
How does sodium bicarbonate decompose according to a balanced equation?The balanced reaction for sodium bicarbonate, NaHCO3, which decomposes when heated to create carbon dioxide, CO2, is 2 NaHCO3(s) Na2CO3(s) + H2O(l) + CO2. Baking soda, also known as sodium bicarbonate, is used for a variety of things, including doughnuts and quick breads, where it acts as a leavener.Because of this, it is calculated that -1013 kJ/mol is required to produce NaHCO3 N a H C O 3 from its component elements.For baked items, we typically use sodium bicarbonate (NaHCO3) (N a H C O 3). Sodium carbonate (Na2CO3), carbon dioxide, and water are the products of heating baking soda.To learn more about sodium bicarbonate refer to:
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at low temperatures and high pressures ethen gas, c2h4, does not behave like an ideal gas. use chemical principles to explain why this is.
At low temperature and high pressure Ethane gas doesn't not behave like Ideal gas because of its larger molecular size.
Ideal gas is a theoretical gas composed of many randomly moving particles. Ideal gases are called as hypothetical gases which do not exist in nature. Gases exhibit ideal behavior at certain conditions. Ideal gases are assumed to have no interactions among the molecules. The volume of the gases is negligible with respect to the total volume. At low temperature and high pressures the molecules of a gas are very close at each other such that the volume of the gas molecules become significant. The interactions between the atoms become strong enough to affect their properties.
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Solid phosphorus and chlorine gas react to form solid phosphorus pentachloride. Suppose you have 9.0 mol of P and 2.0 of Cl2 in a reactor. Calculate the largest amount of PCl5 that could be produced. Round your answer to the nearest 0.1 mol.
Solid phosphorus and chlorine gas react to form solid phosphorus pentachloride. the largest amount of PCl5 that could be produced is 0.5 mol.
The balanced equation for the reaction of solid phosphorus and chlorine gas to form solid phosphorus pentachloride (PCl5) is:
P4 + 10Cl2 -> 4PCl5We know that we have 9.0 moles of P and 2.0 moles of Cl2 in a reactor. To calculate the largest amount of PCl5 that could be produced, we need to use the limiting reagent. The limiting reagent is the reactant that will be completely consumed before the other reactant.To find the limiting reagent, we can find the ratio of reactant to product for each reactant. For P: 4 moles P/4 moles PCl5 = 1
For Cl2: 10 moles Cl2/4 moles PCl5 = 2.5
The limiting reagent is the reactant with the lowest ratio. In this case, Cl2 is the limiting reagent as it is the reactant that limits the amount of product.So we know that 2.0 moles of Cl2 are present and that 10 moles of Cl2 are required for every 4 moles of PCl5 formed.
2 moles of Cl2 = 0.5 moles of PCl5. Therefore, the largest amount of PCl5 that could be produced is 0.5 mol.
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pure semiconductor materials are mixed with impurities to form p or n type materials. a p type material is .
P or N type materials are created by combining pure semiconductor materials with impurities. When an impurity is combined with three valence electrons to give the compound a net positive charge, a P type material is created.
the components, ingredients, or materials from which something is formed or may be made. (2): material that possesses distinguishing characteristics that allow for categorization. sticky substance Any substance used to create an object is referred to as a material. Different materials include clay, glass, paper, wax, air, water, and chalk. Matter is the basis of all materials. Metals, polymers, and ceramics are the three main categories of materials. Steel, fabric, and ceramics are a few examples of them. These classes often have quite distinct origins, traits, and uses. Undoubtedly, materials have a bigger role in our society than we know. Almost every aspect of our everyday lives—including communication, response, shelter, clothing, and food production—is impacted by materials.
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DA chemistry lab requires students to
identify chemical compounds by using
various tests. Each student is given
samples of three different compounds,
labeled A, B, and C. Each student is also
given a list of seven possible compounds.
If a student does not perform the tests and
randomly chooses three from the list, what
is the probability that he guesses all three
correctly?
Answer:
The chance of guessing the first one is 1/9. Second is 1/8. Third is 1/7.
Total is 1/9 x 1/8 x 1/7 = 1/504
Explanation:
In each of the following pairs, circle the species with the higher ionization energy: a) Li or Cs b)Cl^- or Ar c) Ca or Br d) Na^+ or Ne e) B or Be
Circle the species with the greater ionisation energy in each of the pairings below: (a) Li, (b) Ar, (c) Br, (d) Ne, (e) Be. Ionization potential, also known as ionisation energy.
The amount of energy needed in physics and chemistry to take one electron out of a single atom or molecule. Ionization energy is the quantity of energy needed to dislodge the most loosely bound electrons from the outermost shell of an isolated gaseous atom of an element. The amount of energy needed to ionise an isolated gaseous atom is known as the ionisation energy. More energy is needed to free this outermost electron from the nucleus the more securely it is bonded. Ionization energy is often measured in electronvolts (eV) or joules in physics (J). The energy required to ionise a mole of atoms or molecules is given in chemistry as kilojoules per mole (kJ/mol) or kilocalories per mole (kcal/mol), respectively.
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Why don't atoms collapse if they are mostly empty space?
Atoms don't even collapse in a vacuum. Because atoms are completely packed with scattered electrons, they are unable to contract. If the majority of an atom's surface area were empty space.
We could make atoms smaller. There is no empty space within an atom. Atoms are completely filled with widely spaced out electrons, making it difficult for them to contract. Electrons are located in the area termed the electron cloud that surrounds the nucleus of an atom. The set of primary particles that comprise an atom includes many other particles than the electron. Like other elementary particles, electrons can collide with other particles and, when they are diffracted, exhibit wavelike characteristics.
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Consider the previous question again. If 3 moles of MgCl2 are put in a Liter of water then which of the following statements is TRUE? (Mark all that are TRUE...there may be more than one).a. The solution would have a molarity of 1 b. The solution would have a molarity of 3 c. The solution would have an osmolarity of 3 d. The solution would have an osmolarity of 6 e. The solution would have a molarity of 6 f. The solution would have a molarity of 1.5 g. The solution would have an osmolarity of 1.5 h. The solution would have an osmolarity of 9
If 3 moles of MgCl₂ are put in the liter of the water then the true statement are :
d) True
e) True
f) True
g) True
h) True
The true statements are given below if the 3 moles of MgCl₂ are put in the liter of the water :
d) The solution would have an osmolarity of 6
e) The solution would have a molarity of 6
f) The solution would have a molarity of 1.5
g) The solution would have an osmolarity of 1.5
h) The solution would have an osmolarity of 9
The molarity can be calculated by the following formula :
Molarity = moles / volumes in L
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A chemist adds 215.0 mL of a 3.0 mol/L sodium nitrate (NaNO3) solution to a reaction flask. Calculate the mass in grams of sodium nitrate the chemist has added to the flask. Round your answer to 2 significant digits. x10 X S
The chemist added 6.44 g of sodium nitrate to the reaction flask by adding 215.0 mL of a 3.0 mol/L sodium nitrate solution.
when we are dealing with a solution, the concentration is usually measured in molarity (mol/L) which is the number of moles of solute (the substance being dissolved) per liter of solvent (the essence doing the dissolving). In this case, the solution is 3.0 mol/L, which means there are 3.0 moles of sodium nitrate in every liter of solution.
The volume of the solution added to the reaction flask is 215 mL, equivalent to 0.215 L.
By multiplying the concentration (3.0 mol/L) by the volume (0.215 L) we get the number of moles of solute in the solution.
In this case, 3.0 x 0.215 = 0.645 moles of sodium nitrate
The molar mass of sodium nitrate is 84.99 g/mol, which is the mass of one mole of the substance. By multiplying the number of moles of sodium nitrate by its molar mass, we can find the mass of sodium nitrate added to the flask.
0.645 moles x 84.99 g/mol = 54.79 g.
So, in summary, the chemist added 6.44 g of sodium nitrate to the reaction flask by adding 215.0 mL of a 3.0 mol/L sodium nitrate solution.
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a mixture containing equal numbers of moles of ethyl acetate and butyl acetate was separated using distillation. based on the diagrams, which of the following identifies the substance that would be initially present in higher concentration in the distillate and correctly explains why that occurs?
The substance that would be initially present in higher concentration in the distillate is the component with the lower boiling point.
During distillation, a mixture is heated, and the components of the mixture vaporize at different temperatures. The component with the lower boiling point will vaporize at a lower temperature than the component with the higher boiling point. When the vapor is condensed, it will be in the form of a liquid that contains a higher concentration of the component that had a lower boiling point.In the case of a mixture containing equal numbers of moles of ethyl acetate and butyl acetate, Ethyl acetate has a boiling point of 77°C while Butyl acetate has a boiling point of 126°C. Therefore, Ethyl acetate would be the component that would be initially present in higher concentration in the distillate because it has a lower boiling point than butyl acetate and will vaporize at a lower temperature.
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_BaCl2 + _K3N → _Ba3N2 + _KCl
How many moles of BaCl2 do you need to react with 5.3 moles of K3N?
a
12.5 mol
b
18.0 mol
c
3.53 mol
d
7.95 mol
According to the balanced chemical equation and stoichiometry, 7.95 moles of barium chloride will react with 5.3 moles of K₃N.
What is stoichiometry?It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.
As per the chemical equation, 3 moles of barium chloride give 2 moles of potassium nitride , thus 5.3 moles of potassium nitride will give 3×5.3 /2=7.95 moles .
Thus , 7.95 moles of barium chloride will react with 5.3 moles of K₃N.
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a chemist is trying to get two substances to react, but he is unsuccessful. he knows that the two substances should react with one another. which of the following could he do to possibly get the substances to react? (select all that apply)
It's possible that the substances will react to form the product when the substance is heated. The kinetic energy of a substance will increase when heated. Therefore, choice E is the right one.
What is a Chemical reaction?A chemical reaction is the process by which one or more reactants are changed into products, which are new substances. Depending on the reactants, the substances are either chemical elements or compounds.
Since an increase in temperature typically speeds up a reaction by raising the average kinetic energy of the reactant molecules in a solution, heating the solution will cause the formation of product. This will increase the frequency at which different substances in a solution collide, which will cause products to form.
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Complete question:
A chemist is trying to get two substances to react, but he is unsuccessful. He knows that the two substances should react with one another. Which of the following could he do to possibly get the substances to react? (Select all that apply)
a
increase the concentration of one of the substances
b
crush up one of the substances
c
decrease the concentration of one of the substances
d
cool the substances
e
heat the substances
Can anyone help me out here? I'm really struggling
Answer:
Explanation: Cl2 + 2NaBr ------ 2Nacl+Br2
3H2+N2--------2NH3
2Na+Br2-----2NaBr
Cucl2+H2S----cuS+2Hcl
2Hgo+Cl2-----2Hgcl+O2
C+2H2-----CH4
Number of electrons in element F-
Answer:
10
Explanation:
Fluorine has 9 electrons but now it is in its ionic state and the charge is -1 which means it gained one more electron to make it ten
Give the name of the ion with 13 protons and 10 electrons
Answer:
Explanation:
aluminum
Answer: The aluminum ion
Explanation:
Chemistry final
HELP!!!!HELPP please
1) Shown in the image attached
2) Shown in the image attached
3)
a) Copper II sulfate
b) Aluminum chloride
c) Barium nitride
d) Iron III oxide
e) Lithium fluoride
4) Shown in the image attached
What are isotopes?We know that isotopes are the atoms that have the same atomic number but note the same mass number. The models of the isotope Lithium -8 is shown in the image attached.
The orbital diagram shows the arrangement of the elements that are in the atom. The orbital diagrams of nitrogen is shown in the image attached.
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given below are two statements : one is labelled as assertion a and the other is labelled as reason r. assertion a : dacron is an example of polyester polymer. reason r : dacron is made up of ethylene glycol and terephthalic acid monomers. in the light of the above statements, choose the most appropriate answer from the options given below.: Both A and R are correct but R is NOT the correct explanation of A.
B
A is correct but R is not correct
C
Both A and R are correct and R is the correct explanation of A.
D
A is not correct but R is correc
C Both A and R are correct and R is the correct explanation of A. r. assertion a dacron is an example of polyester polymer. reason r dacron is made up of ethylene glycol and terephthalic acid monomers.
in the light of the above statements, Dacron or terylene (a polyester) is created by the condensation polymerization of ethylene glycol and terephthalic acid with the removal of the water molecule.one is labelled as assertion a and the other is labelled as reason r. assertion a : dacron is an example of polyester polymer. reason r : dacron is made up of ethylene glycol and terephthalic acid monomers. The reaction occurs at 420 - 460 K temperature with zinc acetate and antimony trioxide as catalysts. Dacron, commonly known as Terylene, is a polymer made by polymerizing ethylene glycol and terephthalic acid. erylene is a polyester that is also known as Dacron. It is created by the condensation of ethylene glycol with p-terephthalic acid (1,4-benzene dicarboxylic acid). As a result, condensation polymerization will occur.
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in his atomic theory, dalton proposed that all atoms of a given element are identical. which of the following observations provides the best evidence that the proposal is incorrect?
In his atomic theory, Dalton postulated that every atom of a specific element is identical. Given that CuCu's mass spectrum has two peaks, one at 63 amu and the other at 65 amu, option b is correct.
A scientific theory addressing the composition of matter was put forth by English physicist and chemist John Dalton in 1808. It asserted that the fundamental units of matter are minute, indivisible particles known as "atoms." The number of protons in the nucleus of a pure substance, or chemical element, comprised exclusively of one species of atoms, is known. Chemical elements, as opposed to chemical compounds, cannot be reduced through any chemical process to less complicated molecules.
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The complete question is -
a) The mass spectrum of CuCu has a peak at 123amu and another peak at 26amu.
b) The mass spectrum of CuCu has a peak at 63amu and another peak at 65amu.
c)The mass spectrum of CuCu has a peak at 89amu and another peak at 69amu.
The proposed rate-determining step for a reaction is2 NO2(g) → NO3(g)+NO(g)The graph above shows the distribution of energies for NO2(g) molecules at two temperatures. Based on the graph, which of the following statements best explains why the rates of disappearance of NO2(g) are different at temperature 2 and temperature 1 ?Pilihan jawabanNO2(g) is consumed at a faster rate at temperature 2 because more molecules possess energies at or above the minimum energy required for a collision to lead to a reaction compared to temperature 1.NO2(g) is consumed at a faster rate at temperature 2 because the molecules have a wider range of energies allowing for a better orientation during a collision compared to temperature 1.Fewer NO2(g) molecules have a relatively high energy at temperature 1, which favors collisions between molecules rather than between the molecules and the container, leading to a faster rate of disappearance compared to temperature 2.More NO2(g) molecules have a relatively low energy at temperature 1, which increases the number of effective collisions taking place and the rate of disappearance compared to temperature 2.
NO2(g) When compared to temperature 1, NO2(g) is burned at a quicker pace at temperature 2 because more molecules have energies at or above the minimum energy.
necessary for a collision to result in a reaction.A reaction's suggested rate-determining step is2NO2(g) + NO3(g) (g)The graph above depicts the energy distribution for NO2(g) molecules at two temperatures. According to the graph, NO2(g)NO2(g) is burned at a quicker rate at temperature 2 because more molecules have energies equal to or greater than the minimum energy necessary for a collision to result in a reaction at temperature 1. The first step in balancing a chemical equation is to identify your reactants and products. Remember, your reactants are on the left side of your equation. The products
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Calculate how many grams of Aluminum are needed to produce 21.6 grams of Aluminum oxide (Al2O3).
4Al + 3O2 → 2Al2O3
a
11.43 g Al
b
26.982 g Al
c
5.71 g Al
d
132 g Al
Answer: A. 11.43 g Al
Explanation:
To solve this problem, we need to use the process of dimensional analysis, which essentially turns all of the values into fractions that will cancel out units. We always start by using what we are given and then set up the units so that everything cancels besides what we need to solve for.
given Al2O3 g * (1molAl2O3/mass Al2O3 for periodic table) * (Al mole ratio from balanced equation / Al2O3 mole ratio from the balanced equation) * ( Al mass from periodic table / 1 mol Al)
Now, I will plug all values in and solve.
21.6 gAl2O3 * (1molAl2O3/ 101.96 g Al2O3) * (4 mol Al / 2 mol Al2O3) * (26.98 g Al / 1 mol Al)
Now, multiply across the numerator and denominator separately and then proceed with division.
11.43 g Al
Hope this helps!
What type of radioactive decay is illustrated by the following nuclear equation? N ->0 + e positron emission b. alpha decay beta decay gamma production helium emission wnar nroni Search
A nuclear equation can be used to represent alpha decay. If the total numbers of protons and neutrons on both sides of the arrow are equal, the equation is balanced.
While all radioactive decay poses a threat to life, alpha decay poses the least threat. beta decay The transformation of the uranium-238 nucleus into the thorium-234 nucleus is an illustration of this decay. Half-lives are another unit used to express the rate of nuclear decay. A particular isotope's half-life is the amount of time it takes for its radioactivity to decay by half. A radioisotope having a half-life of 14 days will have had half of its atoms decay within that time frame. For instance, after generating intermediates like Uranium-234, Thorium-230, and Lead-206, the decay chain that starts with Uranium-238 ends in Lead-206.
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Question:
Define the following terms associated with titration:
A) Standard solution
B) Endpoint
C) Indicator
Titration
Chemical titrations are reactions performed to determine some property of a solution. In a titration experiment, there are two solutions. In one solution a property is known, and that property is used to discover something about the other solution. Often, a preset volume of the known solution is required to bring about a certain change in the unknown solution.
A titration is a method where the concentration of an unknown solution is ascertained by comparing it to a solution of known concentration.
What is the term titration?Titration is a method of chemical analysis where the amount of a sample's ingredient is determined by adding an exact known amount of a different substance to the measured sample, which the desired constituent reacts with in a specific, known proportion.
An acid-base titration involves gradually adding an unknown base to an acid solution with a known concentration (a standard solution) (or vice versa). To the base, you add a few drops of indicator solution. When the base has been neutralized (when [H+] Equals [OH-]), the indicator's color will change to indicate this. A substance's color changing due to a chemical reaction is an indicator. The pH affects the color of an acid-base indicator, such as phenolphthalein. It is also used redox indicators.
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Classify the following molecular views as representing either a physical change or a chemical change.
Changes in Chemistry:
In chemistry, there is a change in the identity of a substance only if there is a combination of one substance with any other substance. This cause the occurrence due to chemical synthesis.
The statement "In chemistry, there is a change in the identity of a substance only if there is a combination of one substance with any other substance. This cause the occurrence due to chemical synthesis" describes a chemical change.
A chemical change is a change in which one or more substances are transformed into one or more different substances through chemical reactions. This is characterized by a change in the chemical properties or composition of a substance. The statement "In chemistry, there is a change in the identity of a substance only if there is a combination of one substance with any other substance. This cause the occurrence due to chemical synthesis" describes a chemical change because it highlights that in order for a change to be considered chemical, it must involve a combination of two or more substances forming a new substance through a chemical reaction. This new substance will have different properties and characteristics than the original substances, thus a change in the identity of a substance. Examples of chemical changes are combustion, rusting, photosynthesis, and digestion.
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N2 + 3H2 → 2NH3
How many moles of N2 do you need to react with 10.5 moles of H2?
a
3.5 mol
b
31.5 mol
c
15 mol
d
9 mol
According to the stoichiometry of the given chemical reaction, 3.5 moles of nitrogen will react with 10.5 moles of hydrogen.
What is stoichiometry?It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.
According to the given chemical reaction, 1 mole of nitrogen reacts with 3 moles of hydrogen , thus, 10.5 moles of hydrogen will require 10.5/3=3.5 moles.
Thus,3.5 moles of nitrogen will react with 10.5 moles of hydrogen.
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