The absorbance value at a selected wavelength for the absorbance spectra of each of the solutions can be determined by using Beer's law.
What is Beer's law?
According to Beer's rule, the absorbance is inversely proportional to the concentration of the absorbing substance at constant route length. When an is a constant that depends on the medium, the absorbing substance, and the light's wavelength, and b is the path length, C is the concentration (solvent and other components).
The absorbance value for each spectrum is calculated at a certain wavelength. In general, it is desirable to choose a wavelength where the absorbance is at its highest because this will reduce the measurement's relative inaccuracy. The next step is to create a Beer's Law plot showing absorbance vs. concentration.
Hence using the Beer's law we can easily calculate the absorbance value at a selected wavelength for the absorbance spectra of each of the solutions that we prepare.
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Determine the pressure change when a constant volume of gas at 1.50 atm is heated from 295 K to 305 K.
a
1.45 atm
b
1.55 atm
c
1.03 atm
d
2.46 atm
There are so many laws for ideal gas at constant temperature , at constant pressure, the law at constant volume is called Gay-Lussac's law. The pressure calculated is 1.555atm.
What is Gay-Lussac's law?According to this law, pressure is directly proportional to temperature. This gas law is valid only to ideal gas not on the vanderwaal gas. Since it is mentioned in the question that volume is constant we can apply Gay-Lussac's law over here.
Mathematically
[tex]P_{1} T_{2} =P_{2} T_{1}[/tex]
[tex]P_{1}[/tex]= 1.50 atm
[tex]T_{1}[/tex]=295 K
[tex]T_{2}[/tex]= 305 K
Substituting all values given in the question
[tex]P_{2}[/tex]= (1.50 atm×305 K)÷295 K
=1.555atm
Thus the pressure is 1.555atm
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What wull help to determine the outward shape of a crystal?
The dimensions of a crystal's surfaces (also referred to as "faces"), edges, and angles between them all play a role in determining its shape.
The distinctive external shape of a single crystal or crystal group is known as a crystal habit in mineralogy. A crystal's habit depends on its crystallographic form and growth circumstances, which typically results in irregularities because there isn't much room in the crystallizing medium (commonly in rocks). Habit, a characteristic closely related to crystal shape, includes the size and shape of the crystal faces, the way in which different forms combine, the degree to which they are each developed, and the way in which different crystals coexist. Therefore, habit is the distinctive appearance that a mineral can have.
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What is an orbital?
please use sentences and really explain^^
Answer:-
an orbital road
Explanation:-
orbital, in chemistry and physics, a mathematical expression, called a wave function, that describes properties characteristic of no more than two electrons in the vicinity of an atomic nucleus or of a system of nuclei as in a molecule.
Related Topics:- g-orbital p-orbital f-orbital over...
Subjects Of Study:- atomic model line spectrum
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https://www.britannica.com/science/orbital
Answer:
An orbital, also called electron shell, is the path around which the electrons orbit the nucleus of the atom. It has a capacity of 2 electrons in the first orbital, and 8 in the rest. The number of orbitals in an atom can help us find out the period number of that atom.
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Which of the following is true regarding crystalline proteins?
A) Many crystallized enzyme proteins remain catalytically active
B) The diffractive pattern observed during X-ray exposure to the crystal can be used to calculate the electron density map of the crystalline protein.
C) The larger region indicating electron density with in the electron density map, the more accurate the structure determination.
D) A and B are true. E) A, B, and C are true.
The crystallization makes the protein active. The diffractive pattern observed during X-ray exposure to the crystal can be used to calculate the electron density map of the crystalline protein. this makes option D correct.
Proteins are complex amino acids. They are long chain or structure made up of amino acids. Proteins are of different types, globular protein which are soluble and fiber like protein which are insoluble. Hair, skin,muscles are fiber like proteins. Egg albumin and egg white are gobular proteins. Protein may vary from structure to structure. Some are primary structured, some are secondary, some are tertiary or some are Tetranary.
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what are the steps of the election process in order )?
There are 9 steps of the election process Call for Nominations, Preliminary Reviews, Ballot Petition Rules, Nominee Interviews, Committee Meeting, Slate of Candidates Announcement, Voting Opens etc..
Request for Nominations
The nomination process is made public by the Academy.
introductory reviews
Candidates are required to submit biographical sketches that contain digital images, films they have recorded themselves, and curriculum vitae or resumes.
Election Petition Rules
Check out the requirements for adding a petitioner to the general election ballot.
interviewing nominees
Virtual meetings with the Nominating Committee are held.
Commission Meeting
The Nominating Committee meets in late fall to review the materials submitted by candidates, taking into account which positions are open on the ballot, and evaluating key personal, interpersonal, and demonstrated leadership skills as they relate to the qualifications and skill set needs for each position.
Release of the Candidate Slate
Announcing candidates for posts includes posting supporting information online, in the Academy's electronic weekly newsletter, and on social media, including images, self-recorded films, biographical sketches, and answers to questions posed by the Nominating Committee.
Voting begins
Members take part in computerised voting during the month of February for the national Academy elections.
Announcing the results of the election
Following the tallying of all votes and the notification of candidates, the Academy informs members of the election results.
Review of the election and nomination processes
The process for nomination and election is assessed at each stage. The Nominating Committee, the Academy, and the applicants are all asked for their opinions.
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How does the angle of a butterfly affect the lift force of the wing?
Answer: Higher and longer glide experience.
Explanation:
chose one part of the earth system water-air,rock or life and describe how other parts might be effected if the first part were removed
One part of the earth system water-air, rock or life and describe how other parts might be effected if the first part were removed then the biosphere which contain all planet living organism and in the atmosphere which contain all planet air
Earth system is the earth interacting with physical, chemical as well as biological and the sphere are so closely connected that a change in one sphere often result in change one or more of other sphere and events that occur in one component eventually affect the other and the components are geosphere is the ability to live in certain places whereas hydrosphere is the ability to use water whereas atmosphere impacting the temperature and ability to breath and also the water-air, rock in that one is missing so it will definitely affect the other
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1
For this question, choose THREE answers. Which of the following compounds would have a chemical
name that ends in "-ide"?
A Na₂S
B Al2(CO3)3
C CO2
DAIP
E Na₂SO4
The compounds that would end in "-ide" are;
1) Na₂S
2) CO2
3) AIP
What is the name of the compounds?We know that chemical compounds can be identified by the name of the compound. Also, the name of the compound reflects the kind of species that we have in the compound. The task that we have here is that we need to find out the three compounds that would have the ending "-ide" in their names.
We have to know that the names of chemical compounds are often chosen by the International Union of Pure and Applied Chemistry (IUPAC). These rules are revised from time to time and are thus updated in order to help us to identify compounds.
It is important to note that the compounds whose names are most likely to end in the term "-ide" would be the binary compounds that are composed of the metals and the non metals.
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in general, how do the periodic properties of the d-block elements compare with those of the main - group elements?
The periodic properties of the d-block elements differ from the main group elements in that they are less sensitive and less reactive.
The periodic table is divided into blocks; s-block, p-block, f-block, and d-block. The d-block elements are also known as transition metals.
The s and p-block elements are known as the main group elements. Compared to these, the d-block elements have some different properties because of their partially filled d-orbitals.
However, the d-block elements still have many similar properties. These elements can still displace hydrogen from dilute acid and some of them can react with water under appropriate conditions.
The first row of these transition metals are found to be more reactive than the second and third row. However, they are not as reactive as the s-block and p-block elements.
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what mass of CaO, in grams, are formed when 10 grams of Ca reacts with 5 grams of O2
I was asking about this earlier
Please help me with this
The chloroplasts of the plant is the point where carbon dioxide does react with water and the products are sugars and oxygen.
How does the plant cell produce oxygen?We know that the plant obtains its energy form the sun. The sun is called the primary producer in the eco system. This is because the energy from the sun is trapped by the chloroplast of the plants.
Let us note that the chloroplast contains the chlorophyll which is the colored pigment that absorbs the light from the sun. This light that is absorbed from the sun acts a catalyst in a complex reaction in which the carbon dioxide combines with water to form sugars and oxygen.
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Explain how the sun releases enormus amounts of heat energy
why is refrigeration a considered short-term method of storing bacteria
Refrigerator is considered to be best for storing bacteria because the Low temperature of refrigerator reduces the metabolic activity of the bacteria which increases the life time of bacteria.
The bacteria are cultured and grown on the glass plates and then we store them in the fridge. As we know, specific bacteria are hard to culture.
Because of the low temperature, the metabolic activity of the bacteria decreases. This way the we don't have to culture the bacteria again and again and a number of experiments can be performed on the bacteria in a short interval of time which is beneficial for the research oriented purposes.
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a 99.0 ml sample of 1.00 m naoh is mixed with 49.5 ml of 1.00 m h2so4 in a large styrofoam coffee cup; the cup is fitted with a lid through which passes a calibrated thermometer. the temperature of each solution before mixing is 23.00 °c. after adding the naoh solution to the coffee cup and stirring the mixed solutions with the thermometer, the maximum temperature measured is 31.50 °c. assume that the density of the mixed solutions is 1.00 g/ml, that the specific heat of the mixed solutions is 4.18 j/(g·°c), and that no heat is lost to the surroundings.
A 99.0 ml sample of 1.00 m NaOH is mixed with 49.5 ml of 1.00 m H₂SO₄ in a large styrofoam coffee cup; the cup is fitted with a lid through which passes a calibrated thermometer. The temperature of each solution before mixing is 23.00 °c. after adding the NaOH solution to the coffee cup and stirring the mixed solutions with the thermometer, the maximum temperature measured is 31.50 °c. Assuming that the density of the mixed solutions is 1.00 g/ml, that the specific heat of the mixed solutions is 4.18 j/(g·°c), and that no heat is lost to the surroundings, the enthalpy of reaction is found to be 10.6 x 10⁻² kJ/mol.
The enthalpy change of the reaction can be calculated by using the mass of solution, temperature change, and specific heat of water when sodium hydroxide and sulfuric acid reacts.
The balanced chemical equation for the reaction is given as,
H₂SO₄(aq) + 2 NaOH(aq) → Na₂SO₄(aq) + 2H₂O(l)
We know that,
volume of solution is 49.5 mL + 99.0 mL = 148.5 mL
Heat of the reaction can be given as - q = mcΔT
Mass of the solution, m = 148.5 x 1 g = 148.5 g
1 mL
Specific heat, c = 4.18 J /g°C
Temperature change, ΔT = 31.50°C - 23.00°C = 8.5°C
Substituting values in equation,
q = 148.5 g x 4.18 J/g°C x 8.5°C = 5276.20 J
Now we will find moles,
Moles of NaOH = 0.99 mL x 1.00 M = 0.99 mol naOH
Moles of H₂SO₄ = 49.5 mL x 1.00 M = 49.5 mol H₂SO₄
Enthalpy of the reaction will be -
Enthalpy = 5276.20 J = 10.6 x 10⁻² kJ/mol
49.5 mol
Hence, the enthalpy is 10.6 x 10⁻² kJ/mol
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HELP ASAP (25 points!!!)
Option c is correct which says both beryllium and chlorine form covalent bonds.
What are covalent bonds?
When the bonds between the atoms are formed via the mutual sharing of electrons are called covalent bonds.
The bonding between the beryllium chloride is covalent due to the following reasons:
• The beryllium atom has an ionization energy of 900kj/mol which is quite high. Therefore, it can not form cations which are necessary for ionic bonding.
• The beryllium atom has two electrons in its orbitals to share with chlorine atoms electrons.
Hence, this way the bonding between them is covalent and the correct answer is option c.
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The decomposition
of dimethyl ether, (CH3)20, at 510°C is a first-order process with a
rate constant of 6.8 x 10+ s¹:
(a) If the initial pressure of (CH3)20, is 135 torr, what is its pressure after 1420 s?
(CH3)2O, (g) → CH, (g) + Hz (g)+CO(g)
(b) Calculate the half-life ?
If the initial pressure of (CH3)20, is 135 torr, the final pressure after 1420s is 51.4torr .the half life is 1019s.
We know ,
For the 1st order reaction we have the reaction in terms of pressure is
Pₓ = P₀ e⁻kt
lnPₓ = lnP₀ - kt
kt = lnP₀ -lnPₓ = 2.303log P₀/Pₓ
t = (2.303/k) logP₀/Pₓ
Where ,
k = rate constant = 6.8×10⁻4 s⁻1
P₀ = initial pressure = 135torr
Pₓ= final pressure
t = time taken = 1420s
putting the values in the places of the symbol ,
1420 =( 2.303 / 6.8 ×10⁻4 ) log 135/Pₓ
1420 = (2.303×10^4/6.8 ) ×log 135/Pₓ
(1420×6.8 / 2.303×10^4) = log 135/Pₓ
0.41928 = log 135/Pₓ
135/Pₓ = 10^0.41928 = 2.6259
Pₓ = 135/2.6259 = 51.4 torr
Hence , the final pressure after 1420s is 51.4torr .
b) the half life formula is given by ,
T1/2 = 0.693/k = 0.693 / 6.8×10⁻4 = 0.1019×10^4 =1019s
Hence , the half life is 1019s .
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what evidence is there that joule had a exceptional education
Evidence is there that joule had a exceptional education are :
Joule was educated at home with private tutors. When he was child , his father hired leading scientist as the great scientist john Dalton to be his teacher. when he was young he had taken brewery and missed out university. other than this joule had exceptional education. They were taught chemistry , physics the scientific method. he study to continue in home based laboratory. in this laboratory he performed experiments before and after work. Joule gave relationship between heat , electricity and mechanical work but it was widely ignored but later on Thomson recognized joule's work .
Thus, Joule had a exceptional education .
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Would a flash flood along a normally dry river valley be a dangerous event? Please explain.
Flash flood along a normally dry river valley be a dangerous event densely populated area also river valley are so dangerous for flash flood
Flash flood is the move at very fast speed and can roll bounders also tear out tree and destroy building and destroy bridges also and wall of water can rich height 10 to 20 feet and and flash flood are so dangerous in the densely populated area as well as river valley it is so high risk for flash flood and flash flood is the more common in the area where dry climate and rocky terrain are seen because there is lack of soil and vegetation allow torrential rain to flow overland rather than infiltrate into the ground
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1
2.
If you inherited the same amount of money ($7,900,000) as Lizzie Borden (if you don't
know who this is, it's okay), what would you do and why?
Answer:
I would save and invest it.
Explanation:
2Fe(s) + 3S(s) ----> Fe2S3(s)
Using this equation calculate the number of moles of iron needed to react with 2.75 moles of Sulfur.
The number of moles of iron needed to react with 2.75 moles of Sulfur 1.83 moles of iron.
Multiply the number of moles known by the stoichiometric ratio of the unknown and known to determine the number of moles required for the reaction. Balance chemical reactions. Take the ratio of the product stoichiometric coefficient to the reactant stoichiometric coefficient.
Multiply the ratio obtained in step two by the number of moles of reactants indicated. Multiply the atomic weight of each element from the periodic table by the number of atoms of that element present in the compound. Add them all up and put the units of grams/mole after the number. For many but not all problems atomic and molar masses can simply be rounded to the nearest 0.1 g/mol.
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write a scientific explanation about conduction(a type of heat transfer) in CER Form please......
The scientific explanation about conduction is; heat transfer by conduction is the process by which heat flows from region of higher temperature to another region of lower temperature without the bulk movement of the particles of the substance.
What is heat transfer by conduction?Conduction heat transfer is the transfer of heat by means of molecular excitement within a material without bulk motion of the mater.
Heat transfer by conduction allows heat to be transferred from a region of higher temperature, to another region of lower temperature without the bulk or entire movement of the particles of the substance.
Thus, we can conclude that conduction, a method of heat transfer occurs as a result of temperature difference between two bodies.
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Clyde clumsy was directed to weights 50.0g mass on the balance.after diligently goofing off for 10 minutes he quickly weighed the object and reported it as 45.8 g .what was Clyde’s prevent error
The preventable error of Clyde Clumsy is 4.2 g.
What are errors?In measurements, errors refer to differences between the true measurement of an object and the measured value of the object.
The error in measurements can be mathematically expressed as:
Error = True value - measured value.
The amount of error in measurement without taking the sign (positive or negative) into consideration is known as absolute error.
In the case of Clyde, the true weight of the object in question is 50.0 g. Clyde weighed it as 45.8 g instead. The error in Clyde's measurement can be calculated as:
True value = 50.0 g
Measured value = 45.8 g
Error = 50.0 - 45.8
= 4.2 g.
In other words, the error in Clyde's measurement is 4.2 g.
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Keeping pollutants from getting into the water system is better than cleaning the water up after it is polluted. Question 4 options: True False
Keeping pollutants from getting into the water system is better than cleaning the water up after it is polluted this statement is false
Water pollutant means it is the contamination of water sources by substances which make the water unusable for drinking as well as cooking, cleaning, swimming and other activities so the given statement are false because if we do not pollute the water system then there is no need for cleanup the water system that's why the keeping pollutant from getting into the water is better
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In an acid-base neutralization titration, where the end point is a neutral solution, the unknown concentration of the receiving solution can be calculated because...
- the concentration of he acid solution must match the concentration of the basic solution
- the volume of the acidic solution must match the volume of the basic solution
- moles of H3O+ ions donated by the acid must match the moles of the OH- ions donated by the base
- volume of the titrant must be half of the solution formed from the titration
Please explain the answer, I'm very confused T^T
Thank you all so much!
In an acid-base neutralization titration, where the end point is a neutral solution, the unknown concentration of the receiving solution can be calculated because the concentration of he acid solution must match the concentration of the basic solution
Neutralization is a chemical reaction where an acid and a base react with each other in equimolar amount and acid base neutralization titration is based on acid base in quantitatively measurement and that's why it is called as acid base neutralization titration
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The white granite of the idaho batholith near boise, idaho, contains dark gray xenoliths of metamorphic material. Which is older? how do you know?.
Xenoliths are pieces of rock trapped in another rock that are older than white granite due to the principle of inclusion.
What is the principle of inclusion?The principle of inclusion states that rock included in another rock should always be older than the inclusion rock and therefore ti can be used to estimate the age of different types of rocks.
Therefore, with this data, we can see that the principle of inclusion is used to estimate the age of rock and it is based on the layer of different types of rocks
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A piece of solid ni metal is put into an aqueous solution of znso4. write the net ionic equation for any single-replacement redox reaction that may be predicted. (use the solubility rules provided in the owl preparation page to determine the solubility of compounds.)
Ni(s)+ 2H⁺(aq) → Ni²⁺(aq)+ H₂(g)
What do understand by redox reaction?
Redox reactions are oxidation-reduction chemical processes in which the oxidation states of the reactants change. Redox is a shortened version of reduction-oxidation. Two distinct processes—a reduction process and an oxidation process—can be used to describe all redox reactions.
Ni(aq) + e⁻ → Ni(s) ; E⁰ = -0.23 v
H⁺(aq) + e⁻ → H ; E⁰ = -0.00 v
So, the equation when Ni metal is put into an aqueous solution of HCl,
Ni(s)+ 2HCl(aq) → NiCl₂(aq)+ H₂(g)
Therefore, net ionic reaction is:
Hence, Ni(s)+ 2H⁺(aq) → Ni²⁺(aq)+ H₂(g)
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5. What would be the overall charge of a substance that contains 15 protons, 18 electrons, and 16neutrons?a. +15b. -18C. +3d. -3
Explanation:
We have to find the overall charge of a substance that contains 15 protons, 18 electrons and 16 neutrons.
A proton is a subatomic particle that we can find in the nucleus of an atom. Its charge is +1.
An electron is a subatomic particle that we can find around the nucleus and its charge is opposite to the one of the proton. Its charge is -1.
A neutron is a subatomic particle that can be found in the nucleus and has no charge, so its charge is 0.
charge of p+ = +1 charge of n° = 0 charge of e- = -1
Our element has 15 protons, 18 electrons and 16 neutrons, the overall charge will be.
overall charge = 15 * (+1) + 18 * (-1) + 16 * (0)
overall charge = -3
Answer: d. -3
a sample of gas occupies 12 l under a pressure of 1.3 atm. what would the resulting valume be if the pressure were increased to 3.9 atm if the temperature did not change?
Considering the Boyle's law, the resulting volume if the pressure were increased to 3.9 atm and the temperature did not change is 4 L.
Boyle's lawAs the volume increases, the particles (atoms or molecules) of the gas take longer to reach the walls of the container and therefore collide less times per unit of time against them. This means that the pressure will be lower because it represents the frequency of shocks of the gas against the walls. In this way, pressure and volume are related, determining Boyle's law that says:
"The volume occupied by a given mass of gas at constant temperature is inversely proportional to the pressure"
Boyle's law is expressed mathematically as:
P×V=k
Considering an initial state 1 and a final state 2, the following holds:
P₁×V₁=P₂×V₂
Resulting volumeIn this case, you know:
P₁= 1.3 atmV₁= 12 LP₂= 3.9 atmV₂= ?Replacing in the Boyle's law:
1.3 atm× 12 L=3.9 atm× V₂
Solving:
(1.3 atm× 12 L)÷3.9 atm= V₂
4 L= V₂
The new volume will be 4 L.
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a 1.000 g sample of decane, c10h22 is ignited inside a bomb calorimeter. the temperature rises from 20.0 deg c to 78.8 deg c. given that the heat capacity of the calorimeter is 810.0 j/c, what is the internal energy, du, of the reaction in kj/mol?
-6.78x[tex]10^{3}[/tex] kj /mol is the correct answer
What is the internal energy?
Rising temperature and changes in state or phase from solid to liquid and liquid to gas cause a rise in internal energy. Planetary bodies can be viewed as a fusion of heat engines and heat reservoirs
Internal drive U is the sum of the kinetic energy brought about by the motion of molecules and the potential energy brought about by the vibrational motion and electric energy of atoms. The energy contained in every chemical link is often referred to as internal energy. From a microscopic perspective, the internal energy can take on a variety of shapes. For any substance or chemical attraction between molecules.
Mol of decane = mass/ molar mass
= 1/142.29
1/142.29 mol gives internal energy =810.1 x58.8
So1 mol gives 810.1 x58.8x1/142.29 internal energy
so internal energy changes = 810.1 x58.8x1/142.29
-6.78x[tex]10^{3}[/tex] kj /mol
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What does it mean that a homogeneous mixture has a single phase
the components are mixed are uniformly distributed throughout the mixture, then that type of mixtures is known as a homogenous mixture.
What distinguishes homogenous and heterogeneous?In most technical applications, homogeneous refers to a system's qualities being constant throughout the entire system, while heterogeneous (sometimes called inhomogeneous) refers to a system's properties changing within it. Any system with two phases, such as ice and water, is referred to as heterogeneous.
A combination is considered homogeneous when the ingredients are thoroughly combined and dispersed across the entire mixture. These mixes are homogeneous throughout and include only one phase of substance.
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