The rate of effusion of helium under same conditions as that of ammonia is 4.897 mole/min.
Rate of effusion of ammonia is 0.49 times the effusion of helium.Thus, to find out effusion of helium ,effusion of ammonia is divided by 0.49.
Thus, effusion of helium=effusion of ammonia/0.49
=2.40/0.49
=4.897 mole/min.
What is rate of effusion?Effusion relates to the ability of gas to travel through a small opening.Rate of effusion of a gaseous substance is inversely proportional to square root of it's molar mass.The relationship between molar mass and rate of effusion is called Graham's law.
Effusion rate directly depends on the average velocity with which a particle moves.Higher the velocity of particles,higher is the effusion rate.
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Because of increasing evidence of damage to the ozone layer, chlorofluorocarbon (CFC) production was banned in 1996. However, many older cars still have air conditioners that use CFC-12 (CF2Cl2). These air conditioners are recharged from stockpiled supplies of CFC-12. Suppose that 100 million automobiles each contain 1.0 kg of CFC-12 and leak 24 % of their CFC-12 into the atmosphere per year.
How much chlorine, in kg , is added to the atmosphere each year due to these air conditioners?
The mass of chlorine is 9.9 * 10^6 kg.
Total mass of CFC = M(CFC) * number of cars = 1.0 kg * 1.00 * 10^8
= 1.00 * 10^8 kg
Mass of the leaked CFC ;
% leaked = m(leaked) *100 / m(total)
m(leaked) = o.24 * 1.00 * 10^8 kg
m(leaked) = 2.4 * 10^6 kg
Now no. of moles of CFC:
n(CFC) = m(CFC) / MM(CFC) = 2.4 * 10^9 g / 170.92 g/mol = 0.014 * 10^9 mol
= 1.4 * 10^7 mol
No. of moles of chlorine ;
n(Cl) = n(CFC)*2
= 1.4 * 10^7 mol *2
= 2.8 * 10^7 mol
Now at last the mass of the chlorine :
m(Cl) = n(Cl) * MM(Cl)
= 2.8 * 10^7 mol * 35.453 g/mol
= 99.2 * 10^10 g
Mass of Cl = 9.9 * 10^6 Kg
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The mass of 3 different marbles was determined to
be equal to 19.7 g, 19.21 g, and 18 g. What is the
average mass of the marbles?
determine the formula weight of Nh4f to two decimal places
Formula weight of NH4F is 37.037 g/mol
What is formula weight ?The total of the atomic weights in the empirical formula of the compound is the formula mass, often referred to as formula weight, of a molecule. Atomic mass units are used in the formula for weight (amu)
We will choose the atomic mass of each element in the compound from the periodic table, multiply by the number of atoms, then add the result to determine the formula weight.The total atomic weights of the atoms in a molecule's empirical formula make up the formula mass (formula weight) of that molecule. The average mass of a molecule is determined by combining the atomic weights of all the atoms in the molecule to determine its molecular mass (molecular weight).Learn more about Formulae weight here:
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I know what the answers are, but how to I get to that point? I don’t understand what calculations I should be doing.
Answer:
which question doyou need the answer?
WILL GIVE BRAINLIEST NEED HELP ASAP PLEASE
The recommended calcium intake for teenagers is 1300 mg per day. A glass of milk contains 305 mg of calcium. One glass contains 8 fluid ounces.
One fluid ounce equals 29.6 mL. One Liter contains 1000 mL. How many liters of milk should a teenager drink per day to get the recommended amount
of calcium?
Convert 167 mL/h to units of liters per day. Show the unit analysis by dragging the conversion factors into the unit-factor slots.
On converting 167 mL/h , we get 4.008 L/d
Converting 167 mL/h to units of liters per day
1L=1000mL
1d=24hrs
So 167 mL/1h x1L/1000mLx24h/1d=4008L/1000d
=4.008 L/d
Unit conversion is the process of converting the measurement of a given amount between various units, often by multiplicative conversion factors that alter the value of the measured quantity without altering its effects.Unit conversion is a multi-step procedure that includes rounding, selecting the appropriate number of significant digits, and multiplying or dividing by a numerical factor.The conversion from one unit to another in order to ensure accuracy and prevent measurement misunderstanding.Learn more about unit conversion at:
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Assume the specific heat of the solution is equal to the specific heat of water
When we assume the specific heat of the solution is equal to the specific heat of water ΔHdissolution is 27×10⁻⁵
A calorimeter is a device used for heat measurements necessary for calorimetry
Here given data is 4.79g = KBr and are dissolved in 109.00g water and temperature is 21.08°C and according to calorimeter heat of capacity = 1.84 J/°C
We have to calculate enthalpy of dissolution of KBr = ?
ΔHdissolution = 27×10⁻⁵
KBr+H₂0→KBr ΔH=?
qreaction = -qcal
1.79×1.84(-2.4) = 0.8936 J
1000 = -0.0008936
4.79+109.00 = 522.11 g
qcal = 522.11 g×1.84(-2.4) = -2305 J
qreaction = -qcal = -2305 J
n(KBr) = 4.79/74.55gmol⁻¹ = 0.0642mol
2305/ 0.0642mol = 0.00002787mol⁻¹
= 27×10⁻⁵
ΔHdissolution = 27×10⁻⁵
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See attached. Thank you very much!!! :)
The functional groups that are present the compound is shown in the image is;
HaloalkaneAlkeneAmineWhat is the functional group?The functional group is the atom, group of atoms or bond that is responsible for the chemical reactivity of the members of a particular family of organic compounds. We have to note that there are several families of organic compounds and the reactivity of these families is determined mostly by the kind of functional group that we have in that particular molecule.
Now we have the structure that has been shown in the image attached. We now have to look at the image and determine the kind of functional groups that we have in the molecule. In this case, we are actually looking out for the very points along the chain where a chemical reaction is possible.
We can see that the functional groups that we have here are;
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(objectives & conclusion) why it is necessary to know the different apparatus in the laboratory and how to do it
It is important to know the different apparatus in the laboratory and how to do it because these apparatus are handled carefully, and the experiment is done very carefully to avoid any mistakes.
What is a laboratory?A laboratory is a place where all scientific apparatus and instruments are put and experiments are done. These places are kept safe and hygienic and all experiment is done precisely to get results.
Thus, knowing the various lab equipment and how to utilize it is crucial because errors might happen during experiments because of how carefully this equipment must be handled.
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!!!!PLS HELP IM TIMED!!!!!!
Shonda's car gets an average of 27 miles per gallon. Gas costs $2.25 per gallon and she drives 892 miles to get from Baltimore, MD, to Orlando, FL. What are the conversion factors she could use to calculate the cost of gas to get from Baltimore to Orlando? How much will she spend on gas?
Answer:
74.25
Explanation:
27 miles = 1 gallon
1 mile = 1/27 mile
Distance to cover = 892 miles
We will multiply this number with gallons of gas used for 1 mile.
892 miles = 1/27 * 892
892 miles = 33.04 gallons of gas
Rounding off to nearest whole number;
892 miles = 33 gallons
Cost of one gallon of gas = $2.25
Cost of 33 gallons = 2.25*33 = $74.25
She will spend $74.25 on gas.
pleeeeeaaseeeee heeeelpppp
Answer: I think it's C
Explanation:
Probably wrong. I have a different type of chemistry.
Which of the following quantities is equivalent to 3.7 cm?
A. 3.7×10⁻⁵ km
B. 3.7×10⁵ μm
C. 3.7×10⁻² mm
D. 3.7×10² mm
E. 3.7×10⁻³ m
Answer:
A. 3.7×10^-5 km
Explanation:
Whenever there is scientific notation, you always move the decimal the amount of places that the exponent tells you. For a, you would move the decimal 5 times to the left and the km version will be equivalent to the cm version. I hope this helps!
The quantity is equivalent to 3.7 cm is 3.7×10⁻⁵ km. Therefore, option A is correct.
What do you mean by the scientific notation ?The term scientific notation is defined as a way of writing very large or very small numbers. A number is written in scientific notation when a number between 1 and 10 is multiplied by a power of 10.
For example, 650,000,000 can be written in scientific notation as 6.5 ✕ 10^8.
Scientific notation is used to simplify numbers that are too big.
In the scientific notation, you always displace the decimal the amount of places that the exponent tells you. Then would move the decimal 5 times to the left and the km version will be equivalent to the cm version.
Thus, The quantity is equivalent to 3.7 cm is 3.7×10⁻⁵ km, option A is correct.
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Now i know that each of the 3 main layers of earth has its own features,as follows….
The 3 main layers of earth has its own features, as follows;
The Crust: this is seen as the outer layer and this is where humans as well as animals live and plants develop.The Mantle: is seen as the semi-solid magma layer that is made up of iron, magnesium, as well as silicon.The Core: is known to be centrally made up of solid mass of metal ( and it has an inner core) as well as a liquid mass of iron/nickel (which is the outer core).What is the full meaning of Earth?The earth is known to be a kind of fragmental particles that are made up of different part of the surface of the globe.
Note therefore, The 3 main layers of earth has its own features, as follows;
The Crust: this is seen as the outer layer and this is where humans as well as animals live and plants develop.The Mantle: is seen as the semi-solid magma layer that is made up of iron, magnesium, as well as silicon.The Core: is known to be centrally made up of solid mass of metal ( and it has an inner core) as well as a liquid mass of iron/nickel (which is the outer core).Learn more about core from
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Why iodine has no even number of oxidation state?
Answer:The right answer is they don’t belong with it
Explanation:He didn’t cause
the ph of a 0.04 M Calcium hydroxide is
The pH of a 0.04 M Calcium hydroxide solution is 1.39.
How to calculate pH?pH refers to the degree of alkalinity and acidity of a solution.
It is the quantitative measure of the acidity or basicity of a solution. The term "pH" is used in chemistry to denote the values of the concentration of the hydrogen ion {H+}.
The pH scale runs from 0 to 14 where; a value of seven is considered neutral, less than seven acidic, and greater than seven basic.
To calculate the pH of an aqueous solution, one needs to know the concentration of the hydronium ion in moles per liter (molarity).
The pH of a solution can be calculated as the negative logarithm of a concentration or molarity as follows:
pH = - log {H+}
According to this question, a 0.04 M calcium hydroxide is given. The pH can be calculated as follows:
pH = - log {0.04}
pH = 1.39
Therefore, the pH of a 0.04 M calcium hydroxide solution is 1.39.
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1. Obtain a Bg sample element bag, and weigh it to the nearest 0.01 g. Count all of the Bg atoms (beans).
All of the Bg atoms (beans) are 9.689 atoms
Butyl glycol is a clear, colorless, oily liquid with a unique sweet yet mild odor and has the formula C₆H₁₄O₂ it is a butyl ether of ethylene glycol and is miscible with water and common organic solvents it has been produced industrially for over half a century and is used primarily as a solvent in paints and surface coatings but also in inks and cleaning products.
Here given sample is Bg element bag and weigh = 0.01 g
Bg means butyl glycol atomic mass of butyl glycol is 62.07g/mol
So here to find atom;
0.01/atomic mass×6.02×10²³
0.01/62.07g/mol×6.02×10²³
= 9.698 all atoms of bg (bean)
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The monomers of proteins are called amino acids. Draw the protein amino acid alanine and label the central carbon, the amino functional group, the carboxyl functional group, and the methyl functional group. Be sure to show ALL of the atoms within the molecule (Alanine has the molecular formula C3H7NO2). Draw a second amino acid of your choice (glycine is the simplest amino acid to draw).
A CHM 111 student completing Part B recorded the mass of several pieces of dry metal as
23.7412 g.He obtained a graduated cylinder and recorded an initial water volume of 25.0 mL
upon addition of the metal pieces, the water level rose to 27.1 mL
Calculate the density of the metal in units of grams per milliliter. Report only the numerical portion of your answer (and watch your significant figures!).
The density of the metal in units of grams per milliliter is 11.31 g/mL
What is density?The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as
Density = mass / volume
How to determine the density of the metalThe following data were obtained from the question:
Mass of metal = 23.7412 gVolume of water = 25 mL Volume of water + metal = 27.1 mL Volume of metal = 27.1 – 25 = 2.1 mL Density of metal =?Density = mass / volume
Density of metal = 23.7412 / 2.1
Density of metal = 11.31 g/mL
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What is the volume of a rectangular
object with length 17 cm, width 11 cm,
and height 6 cm?
Answer:
1122 cm cubed
Explanation:
The formula for volume of a rectangle would be length times height times width, so just do 17 * 11 * 6 to get your answer, which should be 1122 with units of cm cubed, or cm^3.
Hope this helps! Let me know if you have any confusion!
7.801x|02 please I need the answers asap
Answer:
795.702
Explanation:
Solid zinc(II) sulfide reacts with aqueous hydrobromic acid (HBr) to form aqueous zinc(II) bromide and dihydrogen sulfide gas.
The equation of the double displacement reaction is:
ZnS (s) + 2 HBr (aq) → ZnBr₂ (aq) + H₂S (g)What type of reaction occurs between solid zinc(II) sulfide reacts with aqueous hydrobromic acid (HBr)?The reaction between solid zinc(II) sulfide reacts with aqueous hydrobromic acid (HBr) is an example of a double displacement reaction.
In the reaction, bromide ion from the hydrobromic acid and the sulfide ion from the zinc sulfide both displace each other from their respective positive ions to form new products. The products formed are aqueous zinc(II) bromide and dihydrogen sulfide gas.
The equation of the double displacement reaction is given below:
ZnS (s) + 2 HBr (aq) → ZnBr₂ (aq) + H₂S (g)
The zinc sulfide exists as a solid whereas the hydrobromic acid is an aqueous solution. The zinc (ii) bromide formed exists as an aqueous solution whereas dihydrogen sulfide is a gas.
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Note that the complete question is given below:
Solid zinc(II) sulfide reacts with aqueous hydrobromic acid (HBr) to form aqueous zinc(II) bromide and dihydrogen sulfide gas.
Express your answer as a chemical equation. Identify all of the phases in your answer.
What is the molecular formula of a compound with the empirical formula SF5 and a formula mass of 254.1 amu?
molecular formula:
What is the molecular formula of a compound with the empirical formula CH2O and a formula mass of 180.156 amu?
molecular formula:
The molecular formula is a notation indicating the number of atoms of each element present in a compound.
The molecular formula of a compound with given empirical formula can be calculated as follows:
molecular formula = (empirical formula)n
The molecular formula of the given compound is as follows:
(SF5)n = 254.1
{32 + 19(5)}n = 254.1
127n = 254.1
n = 2
Molecular formula = (SF5)₂ = S₂F₁0
(CH₂O)n = 180.156 amu
{12 + 2 + 16}n = 180.156
(30)n = 180.156
n = 6
Molecular formula = (CH₂O)₆ = C₆H₁₂O₆
Therefore, the molecular formula of a compound with the empirical formula SF₅ and a formula mass of 254.1 amu is S₂F₁₀. The molecular formula of a compound with the empirical formula CH₂O and a formula mass of 180.156 amu is C₆H₁₂O₆Learn more about molecular formula at: https://brainly.com/question/14425592
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1. How many grams was each person's final serving of 1 burger?
Each person in the group gets two Burgers. (To Solve this Assume 4 persons per VIRTUAL group)
group)
(Key: 1 Pound = 453 grams; **burgers lose approximately 10% of their weight during
cooking.)
As per conversion units, 45.3 grams is each person's final serving of 1 burger.
As 1 burger has a weight of 1 pound which is equal to 453 grams ,and as each burger looses 10% of it's weight while cooking .
So the weight of 1 burger after cooking is,
10/100×453=45.3 g
Thus,each person's final serving of 1 burger is 45.3 grams.
What are conversion units?Conversion units or unit conversion expresses the same property with a different unit of measurement.It is a numerical expression or a number that is used to change one set of units to another.
It usually occurs through multiplicative conversion factors through which the measured quantity is changed without changing it's effects.
There are different conversion systems such as:
1) SI system
2)CGS system
3)MKS system
4) FPS system
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Calculate with full procedure:
a. The number of Fe atoms in 363.2 kg of iron.
R= 3.916 x 1027 Fe atoms
b. The mass of a sample of 1.0 x 1012 atoms of metallic silver.
R= 1.8 x 10-10g Ag
c. The number of Argon atoms in a 5.25 mg Ar sample.
R=7.91 x 1019 atoms
d. The mass of a sample of aluminum that contains the same number of atoms as 35.55 g of zinc.
R= 14.66g Al
Answer:
5.3x1022 atoms
Explanation:
If we were to represent five grams of iron in term of the number of atoms of iron, we would get 5.3x1022 atoms of iron.
Compare the compressibility of gases and liquids. Support your answer by describing the arrangement of particles in gases
and liquids.
The compressibility of gases is more difficult than that of liquids. Because, the intermolecular forces in gases is very less and to compress the diffused gas molecules high pressure have to be applied.
What is compressibility ?Compressibility of a substance is the ability to compress to decrease its volume under high pressure. It is dependent on the intermolecular force in the substance.
In liquids unlike solids there is some space for the particles to move apart and that is why liquid can flow. In the case of gases, this distance between particles is greater and particles are free to spread everywhere. Therefore, the intermolecular attraction is very less in gaseous substances.
To compress the substance, the force of attraction between particles have to be increased and volume have to be decreased. Therefore, it is too difficult to compress gases, in which particles are far apart from each other.
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How would each of the following procedural errors affect the value obtained for the
molar volume of hydrogen gas? Explain your reasoning.
(a) Some bubbles of hydrogen gas remained clinging to the sides of the tube.
(b) Some magnesium metal was left un-reacted at the end of the experiment.
(c) 7 mL of the HC1 were used instead of 5 mL.
Molar volume of hydrogen gas is because 'some bubbles of hydrogen gas remained clinging to the sides of the tube'
The volume occupied by 1 mole of the molecules of a gas at STP i.e. standard temperature and pressure
Here if liquid is not vaporized completely then bubbles of hydrogen gas remained clinging to the sides of the tube and then the condensed vapor in the flask contains the air which is initially occupied before the liquid is heated and when calculating the molar mass of the vapor the moles of air which are initially present are not excluded, so that the molar mass of the vapor would be increase in large value
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An intermediate step in the industrial production of nitric acid involves the reaction of ammonia with oxygen gas to form nitrogen monoxide and water. How many grams of nitrogen monoxide can form by the reaction of 507 g of ammonia and 845 g of oxygen?
g nitrogen monoxide
Taking into account the reaction stoichiometry, 633.75 grams of nitrogen monoxide can form by the reaction of 507 g of ammonia and 845 g of oxygen
Reaction stoichiometryIn first place, the balanced reaction is:
4 NH₃ + 5 O₂ → 4 NO + 6 H₂O
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
NH₃: 4 molesO₂: 5 molesNO: 4 molesH₂O: 6 molesThe molar mass of the compounds is:
NH₃: 17 g/moleO₂: 32 g/moleNO: 30 g/moleH₂O: 18 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
NH₃: 4 moles× 17 g/mole= 68 gramsO₂: 5 moles× 32 g/mole= 160 gramsNO: 4 moles× 30 g/mole= 120 gramsH₂O: 6 moles× 18 g/mole= 108 gramsLimiting reagentThe limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. This means the when the limiting reagent is finished, the chemical reaction will stop.
Limiting reagent in this caseTo determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 68 grams of NH₃ reacts with 160 grams of O₂, 507 grams of NH₃ reacts with how much mass of O₂?
mass of O₂= (507 grams of NH₃×160 grams of O₂)÷ 68 grams of NH₃
mass of O₂= 1,192.94 grams
But 1,192.94 grams of O₂ are not available, 845 grams are available. Since you have less mass than you need to react with 507 grams of NH₃, O₂ will be the limiting reagent.
Mass of nitrogen monoxide formedThe following rule of three can be applied: if by reaction stoichiometry 160 grams of O₂ form 120 grams of NO, 845 grams of O₂ form how much mass of NO?
mass of NO= (845 grams of O₂×120 grams of NO)÷ 160 grams of O₂
mass of NO= 633.75 grams
Finally, 633.75 grams of nitrogen monoxide can form by the reaction of 507 g of ammonia and 845 g of oxygen.
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Question 2 (3 points)
What is the empirical formula for a compound that contain 1.011 g of chromium and 0.467 g of oxygen. ?
Chromium oxide's empirical formula is Cr₂O₃
The simplest whole-number ratio of atoms in a compound is the empirical formula. The proportion of atoms to moles is the same. Our task then is to determine the molar ratio of Cr to O.
Cr's mass is 7.35 g.
10.74 g of chromium oxide are equal to 10.74 g of chromium and 10.74 g of oxygen.
O's mass is 10.74 g - 7.35 g, or 3.39 g.
Moles of Mg = 52.00 g Mg = 0.1413 mol Mg/7.35 g Mg = 1 mol Mg
Moles of O equal 3.39 g O to 1 mol O and 16.00 g O to 0.2119 mol O
For every 3 mol of O, there are 2 mol of Cr.
Chromium oxide's empirical formula is Cr₂O₃.
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A two-step reaction mechanism that has an overall reaction of 2H₂O₂(aq) step and rate law. Step 2: H₂O₂ + Or → H₂O + O₂ + I (fast) Rate = K[H₂O₂][1] 2H₂O(1) + O₂(g) has the following fast Which is the correct rate-determining step given the information in the reaction above? O step 2: H₂O2 + OI→ H₂O + O₂ + 1¯ step 3: 2H₂O2 + 2H₂O + OI™ O step 1: H₂ + O₂ + 1 → H₂O2 + Or O step 1: H₂O2 + H₂O + or S
1. Rate law - A chemical reaction's rate and the concentrations of the reactants involved are correlated by an expression known as the rate law, commonly referred to as the rate equation.
Step (1) is the rate-determining step because it is the slow step, it determines the reaction's overall pace; therefore,
Rate law= K [H₂O₂] [I⁻]
2. order of reaction = second order
The Order of Reaction describes how the rate of a reaction depends on the concentration of each component. As a result, the rate of a first-order reaction depends on the concentration of a single species.
3. First step is the rate determining step because it is the slow step. Slow step determines the rate.
The rate-determining step is the one that establishes the speed (rate) of the complete chemical reaction.
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Your question is incomplete. For missing part refer the image below.
A chemist is called by the highway patrol to identify a clear colorless liquid that was spilled on the freeway. What tests could the chemist do to identify whether the liquid is a mixture or a substance?
A chemist is called by the highway patrol to identify a clear colorless liquid that was spilled on the freeway. The test chemist could do to identify whether the liquid is a mixture or a substance is melting point.
If it is to be identified that whether a liquid is a mixture or a pure substance, testing the melting point is preferably considered.
Melting point is a a range of temperature of a substance from which the first crystal starts melting.
Pure substances have sharp melting point but an impure substance or a mixture melts over a given range of temperature.
By looking at the overall composition, pure substance and mixture can be identified visually but it is quite difficult in case of a clear, colorless liquid.
Therefore, melting points can be used to find out whether a liquid is a mixture or a substance.
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