A student compares a sample of isooctane with some petrol. the student found that the isooctane boiled at 99°C while the petrol boiled between 45 and 95°C. which of these is a puse Substance? Explain ur answer. ​

Answers

Answer 1

Answer:

The isooctane

Explanation:

A pure substance is, according to Wikipedia, "a chemical substance is a form of matter having constant chemical composition and characteristic properties." That's a lot of words, but we just need to focus on some of them: "constant... characteristic properties." The properties of a pure substance always stay the same, no matter what.

The boiling point of a substance is one of its properties. It looks like the petrol boils at different points, between 45 and 95°C. The isooctane, on the other hand, boils consistently at 99°C. So, we can infer that the isooctane is the pure substance.

Hopefully that was helpful! If you need more questions answered, let me know. :)


Related Questions

Why is it important to possess fundamental research skills in pursuing your study?

Answers

Answer:

Research Skills enable people to identify a problem, collect informational resources that can help address the problem, evaluate these resources for quality and relevance and come up with an effective solution to the problem.

Explanation:

It is important because it might increase you critical thinking skills and it's much more easy for you to collect data. It also helps you analyze information from different sources off the internet.

There is 200 grams of water on a stove. The water is currently 25 C. How much energy in joules must be used to raise the water to 90 C?

Answers

Answer:

q

=

64 kJ this is answer. .

đơn chất nào sau đây tác dụng với dung dịch axit sunfuric loãng sinh ra khí ?
a đồng
b cacbon
c nhôm
d lưu huỳnh

Answers

Answer:

C. Al

Explanation:

2Al+ 3H2SO4(l)------> Al2(SO4)3+ 3H2

Look at the Recording station detector on the upper left side of the Gizmo. What happens when the seismic waves hit the recording station?

Answers

Answer:

I don’t know what recording station you’re referring to but, When seismic waves reach the seismograph, a graphical record, or seismogram, is produced

Explanation:

The seismic waves hitting the recording station has been resulted in the seismograph, that has been evident of the earthquake.

The seismic wave has been the radiation, with the result of the movement of the earth surface. The movement has been result in the earthquake.

The intensity of the earthquake has been measured by seismograph on the Richter scale. The seismic wave results in the movement of the leads to the production of the seismograph.

The seismic waves hitting the recording station has been resulted in the seismograph, that has been evident of the earthquake.

For more information about earthquake, refer to the link:

https://brainly.com/question/1296104

Which are effects of long-term exposure to mustard gas? Select all that apply. One, some, or all responses may be correct.

Answers

The effects of long-term exposure to mustard gas causes mortality and chronic respiratory disease.

Exposure to mustard gas in the long term can result in mortality from influenza, pneumonia as well as chronic breathing disease. Exposure for long term leads to respiratory complications and septic shock. Extensive breathing in the environment of mustard gas can cause chronic respiratory disease, respiratory infections or death.

Extensive eye exposure to this gas can cause permanent blindness. Exposure to mustard gas may also increase the chances of lung and respiratory cancer so we can conclude that mustard gas is lethal and can cause a number of diseases in a person who is exposed to it.

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Do all particles pass right through the atoms undeflected?​

Answers

AnswereYs

Explanatioynt:Yes


9) What is the final pressure in the container shown below after the valve is opened and the gases are allowed
to flow? (The gases do not act)
0
4.00 am
3.00


NE
2.00 am
2.00 L

Answers

A 3.00-L container with O₂ at 4.00 atm is connected to a 2.00-L container with Ne at 2.00 atm, resulting in a final pressure of 3.20 atm in the container.

We have 2 containers connected by a valve.

One container has a volume of 3.00 L and contains O₂ at 4.00 atm. The other container has a volume of 2.00 L and contains Ne at 2.00 atm.

When the valve is opened, the total volume is the sum of the 2 containers.

[tex]V_2 = 3.00 L + 2.00 L = 5.00 L[/tex]

Assuming constant temperature and ideal behavior, we can calculate the final pressure of each gas using Boyle's law.

O₂

[tex]P_1 \times V_1 = P_2 \times V_2\\\\P_2 = \frac{P_1 \times V_1}{V_2} = \frac{4.00atm \times 3.00L}{5.00L} = 2.40atm[/tex]

Ne

[tex]P_1 \times V_1 = P_2 \times V_2\\\\P_2 = \frac{P_1 \times V_1}{V_2} = \frac{2.00atm \times 2.00L}{5.00L} = 0.800atm[/tex]

The final pressure in the container will be the sum of the final pressures of the gases.

[tex]P = 2.40 atm + 0.800 atm = 3.20 atm[/tex]

A 3.00-L container with O₂ at 4.00 atm is connected to a 2.00-L container with Ne at 2.00 atm, resulting in a final pressure of 3.20 atm in the container.

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Which of the following correctly completes the statement?
Cations are always _____ than the parent atom and anions are always _____ than the parent atom.

Answers

Answer: smaller, larger

Explanation:

Cations are always {smaller} than the parent atom. Anions are always {larger} than the parent atom.

Cations are always smaller than the parent atom, and anions are always greater than the parent atom.

What is parent atom ?

The term "parent atom" refers to an atom that has not yet undergone any chemical transformation. A parent atom is one that is discovered in its initial state.

Because they contain fewer electrons while maintaining the same nuclear charge, cations are always smaller than their parent atoms. Because the protons in the nucleus are holding the remaining electrons more tightly, their radii are less than those of the parent atoms. In the case of anion, this is the opposite.

Due to variations in electron-electron repulsion, the ionic radii of cations and anions are always less or bigger than the parent atom, respectively. The trends in ionic radius follow those in atomic size.

Thus, Cations are always smaller than the parent atom, and anions are always greater than the parent atom.

To learn more about parent atom, follow the link;

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#SPJ6

Word Equation for Magnesium reacting with Iron Chloride

Answers

Answer:

3Mg+2FeCl3------------3MgCl2+ 3Fe

Who know the answers for both of these or know were to get them from

Answers

Answer:

kdkekejdjejeneneenendjenejekeke do do do do do do d

Answer:

go ahead bro

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Sulphuric acid (H2SO4) is titrated against 25.00cm3 of 0.200 mol/dm3 Sodium hydroxide solution (NaOH). It is found that 23.20 cm3 of sulphuric acid is required for neutralization. Calculate the concentration of Sulphuric acid

Answers

My answer,
Approximately 0.108 mol dm^-3

Explanations,
1. Make the balance chemical equation
2. Convert the 25 cm^3 to 0.025 dm^3 by multiplying 25 with 10^-3 (or 25 / 1000)
3. Concentration is equal to = moles of substance over volume of solution
4. Calculate how many number of moles present in 0.025dm^3 of sulphuric acid.

Mole = concentration x volume
^ rearranged from conc = mole/volume

Mole = 0.200 x 0.025 = 0.005 mol

5. Use the balance chemical equation ad mole ratio. In this case,

H2SO4 + 2NaOH —> 2H2O + Na2(SO4)

Thus the ratio between Sulphuric acid and Sodium Hydroxide is 1:2

Hence, the mole of H2SO4 is 0.005/2 = 0.0025 mol

6. Calculate the concentration of the sulphuric acid by using conc. = mole/volume

Hence the answer is 0.0025/(23.20 x 10^-3) = 0.108 mol dm^-3 rounded off at the 3 Sigfigs

I hope u understand sorry for any mistakes done.

What’s boiling/melting point

Answers

Answer:

Melting point is the temperature at which solid and liquid phases of a substance are in equilibrium.

Boiling point is the temperature at which its vapour pressure is equal to the external pressure.

Answer:

melting point is the temperature at which a solid changes into a liquid.  

boiling point, temperature at which the pressure exerted by the surroundings upon a liquid is equaled by the pressure

Explanation:

What does it mean for a unit to be "derived"?

Answers

Answer:

you differentiate to find the derivative

Explanation:

Answer:

A derived unit is a unit that results from a mathematical combination of SI base units.

OR

A unit of measurement obtained by multiplication or division of the base units of a system without the introduction of numerical factors.

Explanation:

i dont know if that answered your question

THIS IS DUE LIKE REALLY SOON I RLLY NEED HELP :,)

Answers

double displacement

How might a molecule have a very strong molecular dipole?

Answers

Answer:

When you make the electronegativities of A(Positive partial charge) and C (Negative Partial charge) less and have B with a strong electronegativity to create a very strong molecular dipole. ... Both molecules possess strong molecular dipoles.

I need help with this

Answers

1. 26
2. 115
THIS IS TO REACH 20 CHARACTERS
1. 26
2. 115

I hope this helps:)

suitable electrolytes for fuel cells​

Answers

Answer:

Alkaline fuel cells use an alkaline electrolyte such as potassium hydroxide or an alkaline membrane that conducts hydroxide ions rather than protons.

Explanation:

OR USE GATORADE AND POWERADE. BE A MAN.

can anyone tell me "what are the exceptions of law of reciprocal proportions??"​

Answers

The law states that if two different elements combine separately with a fixed mass of a third element, the ratio of the masses in which they combine are either the same or are in simple multiple ratio of the masses in which they combine with each other .

balance CHCl3 + O2 = CO2 + H2O + Cl2

Answers

Answer:

2CHCl3 + 5/2 O2 => 2CO2 + H20 + 3Cl2

Explanation:

Left Hand Side(LHS)

We have CHCl3 and O2

Right Hand Side(RHS)

We have CO2, H2O and Cl2

Balancing

To make sure that they have same values, put 2 before CHCl3 giving 2CHCl3 and 3 on Cl2(RHS) for chlorine gas giving 3Cl2

H2O remains the same

Before CO2 put 2 giving 2CO2

To make sure that oxygen is balanced put 5/2 before it. This gives 5/2 O2 (2 cancels out don't worry)

Combining all;

2CHCl3 + 5/2 O2 => 2CO2 + H20 + 3Cl2

I hope this helps. Have a nice studies.

Kinda confused on this. i need some help.​

Answers

Balancing chemical equations is like a small puzzle. The ultimate goal is to end up with the same number of atoms on both sides of the arrow.

To start, check to make sure it isn’t already balanced. If coefficients aren’t present, it’s assumed to be one. In this case, there’s just one aluminum on both sides, but the right hand side has one more fluorine than the left. This means that we’ll have to change the coefficients to make them match. Since we can’t multiply the two fluorines to make three with a whole number, we have to change this one and the one in front of the aluminum fluoride. Let’s put a 3 in front of F2 and a 2 in front of AlF3. So far, we have:

Al + 3F2 -> 2AlF3

Check the number of fluorines; sure enough, we have six on both sides. However, we’ve imbalanced the aluminums by balancing the fluorines. The fix is easy, though; change the coefficient from one to two in front of the aluminum to make them match. The result is therefore:

2Al + 3F2 -> 2AlF3

Check your element totals again; sure enough, they’re all balanced. This is the balanced chemical equation.

Hope this helps!

What is the mass of 1,300 cm of gasoline? The density of gasoline is 0.67 g/cm.

Answers

Answer:

Volume x Density = Mass of a substance

1300 x 0.67 = 871

The mass is 871 (unit)

carbon reduction process is not applied for extraction of alkali metal . why ?​

Answers

Answer:

The alkali metals are the highly electropositive metals. Highly electropositive metals cannot be extraction carbon reduction process, because these metals do not react with carbon

Explanation:

how many moles are present in 10.0 grams of sodium hydroxide

Answers

Answer:

0.25

Explanation:

no.of moles =10/40

What causes streams to form?
O absorption
O precipitation
O glaciers
O lakes

Answers

Answer: essay the answer is B: precipitation

Explanation:

the basic fact that determines molecular shapes is that

Answers

Answer:

The shape of a molecule is mostly determined by repulsion among the pairs of electrons around a central atom.

How many grams of hydrogen are needed to fully react 621. 9 grams of nitrogen gas.

Answers

Answer:

9 grams of nitrogen gas

Explanation:

Don't really understand the question

Answers

Answer:

Did they mean those diagrams are the salt or what?

A chemist who frequently carries out a complex experiment is
likely to have high:
a. Precision, but low accuracy
b. Precision
c.Accuracy, but low precision
d.Accuracy

Answers

Answer:

c.

Explanation:

This is because the chemist will get the average of the experiment from multiple attempts but not precision because the experiment is complex rather than simple.

The chemist will most likely have high accuracy, but low precision. A

chemist who has been performing experiments frequently will be accurate

when taking the required measurements for the experiment due to the

frequency.

Precision however won't be affected because precision deals with how

close his results from the experiment are. The complexity of the

experiment and the different variables used makes him likely to have low

precision.

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When a substance is heated ,the kinetic energy of its molecules

Answers

Answer:

When a substance is heated ,the kinetic energy of its molecules also increase.

Explanation:

K.E is directly proportional to T

how long does it take to rehydrate after being dehydrated

Answers

Answer:

up to 120 minutes to digest water and rehydrate your body

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