admin

Chemistry High School

A fellow student does not understand why air is a mixture. Write a brief explanation about why air is a mixture, whether it is homogeneous or heterogeneous, and how it can be separated.

2 months ago

Solution 1

Guest #6877713

2 months ago

Air is a mixture because it consists of oxygen nitrogen and co2 it is therefore a homogenous mixture or solution and it can be seperated by a process know fractional distillation of liquid air. This is aprocess that converts air into a liquid form and then allows itto be portioned out

Solution 2

Guest #6877714

2 months ago

Air is a mixture because it consists of many different molecules (e.g. oxygen, nitrogen) however these different molecules are not chemically bonded to each other, they are simply circulating in the same space altogether. Generally, the different gases can be separated from the mixture by cooling air to a temperature below zero (not sure quiet what, about 180 degrees I think) so that the mixture is liquid. The liquid mixture is then passed through into a fractionating tower and gradually heated up- this process is called fractional distillation, and essentially the different substances in the liquid air mixture are separated and collected off as they all boil off at separate boiling temperatures as the mixture is gradually heated.

Not quite sure what you mean by the homogeneous/ heterogeneous part, but I'm sure someone else will have the answer. Hope this somewhat helps!

📚 Related Questions

Question

The hypothetical elements shown here (figures a–d) do not include hydrogen or helium. Which element would you expect to bond covalently with an oxygen atom to form a two-atom molecule?

Solution 1

Sulfur is the element which can bond covalently with an oxygen atom to form a two-atom molecule.

What is element?

A chemical element is a material that cannot be degraded chemically. Although chemical processes do not modify atoms, nuclear reactions can produce new elements.

Elements are classified based on the number of protons they have. An element's atoms all have the same amount of protons, but differing numbers of electrons as well as neutrons. Ions are formed by altering the electron-to-proton ratio, whereas isotopes are formed by changing the amount of neutrons. Sulfur is the element which can bond covalently with an oxygen atom to form a two-atom molecule.

Therefore, Sulfur is the element which can bond covalently with an oxygen atom to form a two-atom molecule.

To learn more about element, here:

brainly.com/question/28223007

#SPJ6

Solution 2

Answer:

Explanation:

Question

In general how are word equations written to describe chemical equations

Solution 1

chemicals reacting are written on the left, what is formed is written on the right after the = sign

eg Copper + oxygen = copper oxide.
Hope this helps , mark as brainliest and say thanks THANKS..

Question

Which statement describes a general property of bases? They taste sour. They turn blue litmus red. They conduct an electric current in a solution. The concentration of H+ is greater than concentration of OH- .

Solution 1

The correct answer is "They conduct an electric current in a solution. "

Acids taste sour, and they turn blue litmus paper red. Also acids such as HCl when dissociates in water it releases H⁺ ions. Thus in an acid the concentration of H⁺ is greater than OH⁻.

HCl + H₂O -> H⁺ + Cl⁻

A base such as NaOH will dissociate in water to form Na⁺ and OH⁻. The ions of an aqueous solution of base will conduct electricity.

NaOH + H₂O -> Na⁺ + OH⁻

Solution 2

Hello there.

Which statement describes a general property of bases?

They conduct an electric current in a solution.

Question

Please help!! A good scientific experiment has the following characteristics: 1. It answers a testable question. 2. It answers a well-defined question. 3. It is systematic. 4. It is controlled. For each of these four characteristics, explain in your own words what it means, and what would likely happen if an experiment did not have that characteristic.

Solution 1

1. You can't test something that you don't have the means to find the answer. For example: You can't test how mustard effects cell growth if you have no way of seeing the cells.
2. The question you are trying to answer should be understandable so people know exactly what it is you are trying to answer.
3. It has a process and the steps are easy to follow so it can be replicated accurately for the purpose of further research.
4. It is done in a way that makes sure no unexpected things cause change to the outcome. It's like when you're trying to find what you're allergic. You don't eat a bunch of foods and wait for a reaction, you eat one thing at a time so that way you're not missing any factors.

Does that make sense?

Question

What is the volume of 53.0g of nitrogen dioxide gas at STP? Answer in units of L.

Solution 1

The volume of 53.0g of nitrogen dioxide gas at STP is 6.78 mol.

What is nitrogen dioxide ?

Chemically, nitrogen dioxide has the formula NO₂. It belongs to a group of nitrogen oxides. Millions of tons of nitric acid are produced annually for use largely in fertilizer manufacture, with NO₂ serving as an intermediary in this process. As the temperature rises, the gas turns reddish-brown.

Nitrogen dioxide is created when reactions between nitrogen oxide (NO) and other nitrogen oxides (NOx) and other airborne molecules occur. The burning of fossil fuels (coal, gas, and oil), particularly the fuel used in automobiles, is the largest source of nitrogen dioxide originating from human activity.

We have the number of moles of gas ( n ), by multiplying the given mass by the inverse of the molar mass of nitrogen gas, which exists in diatomic form given by

n = ( 53g ) × 128.02mol/g

= 6.78 mol

Thus, The volume of 53.0g of nitrogen dioxide gas at STP is 6.78 mol.

To learn more about nitrogen dioxide, follow the link;

brainly.com/question/1467765

#SPJ1

Question

Most water vapor enters earths atmosphere by the process of

Solution 1

Sublimation;When anything solid turns into a gas without first becoming liquid, When the surface layer of snow or ice turns into fog or steam without melting,

Question

If the pressure of the gas in a 2.31 L balloon is 0.12 ATM and the volume increases to 7.14 L what will be the final pressure of the air within the balloon? Assume the temperature remains constant

Solution 1

We can use the ideal gas equation which is expressed as PV = nRT. At a constant temperature and number of moles of the gas the product of PV is equal to some constant. At another set of condition of temperature, the constant is still the same. Calculations are as follows:

P1V1 =P2V2

P2 = P1 x V1 / V2

P2 = 0.12 x 2.31 / 7.14

P2 = 0.04 atm

Solution 2

Answer: 0.04 atm

Explanation:

Boyle's Law: This law states that pressure is inversely proportional to the volume of the gas at constant temperature and number of moles.

$P\propto \frac{1}{V}$ (At constant temperature and number of moles)

$P_1V_1=P_2V_2$

where,

$P_1$ = initial pressure of gas = 0.12 atm

$P_2$ = final pressure of gas = ?

$V_1$ = initial volume of gas = $2.31 L$

$V_2$ = final volume of gas = 7.14 L

$0.12\times 2.31=P_2\times 7.14$

$P_2=0.04atm$

Therefore, the final pressure of the air within the balloon is 0.04 atm.

Question

An industrial chemist is studying a sample of an unknown metal. Describe two ways he could change the metal physically and two ways he could change the metal chemically to try to identify it.

Solution 1

Answer:

Some of the physical changes used by the industrial chemist in order to identify it is by scratching it with other metals in order to find the hardness of it. Trying to deform it in order to find the malleability, and to heat it and measure the temperature in order to find the melting point.

Some of the chemical changes used by the industrial chemist in order to identify it is by inserting it in water to observe that whether it reacts with it or not, if the reaction is violent, then the metal belongs to either group I or group II. The other method is to insert it in acids of distinct strength and to observe its reaction. The metals belonging to the second group react briskly with acids. The other metals react gradually with acids and others are almost inert.

Solution 2

Answer:

Explanation:

Question

The vapor pressure of ethanol at 25°C is 7.828 kPa . Calculate the vapor pressure in atm .

Solution 1

First you get 7.83 kPa = 7.83 * 10^4 Pa Then convert it to atm by using the relation 1 Pa = 9.8692 * 10^-6 atm, this gives you 7.83 kPa = 7.83 * 10^4 * 9.8692 * 10^-6 atm = 77.275836 * 10^-2 atm = 0.77275836 atm Now round to three significant digits, = 0.773 atm

Question

What happens when you swallow acid

Solution 1

Some of the symptoms from swallowing hydrochloric acid:

-Abdominal pain
-Breathing difficulty due to swelling of throat
-Chest pain
-Drooling
-Fever
-Mouth pain
-Rapid drop in blood pressure
-Throat pain
-Vomiting blood

Solution 2

It would depend on the type of acid.. If you were to swallow Hydrochloric Acid you would likely have very bad pain in your abdominal, difficulty breathing, bad chest pain, fever, bad pain in your mouth, pain in your throat, and it's also possible to be vomiting blood.

📂 Subjects

Mathematics 2647929

History 842281

English 748681

Biology 586256

Social Studies 406852

Chemistry 368373

Business 348603

Physics 324927

Health 199835

Spanish 130075

Geography 112100

Computers and Technology 106146

Arts 77164

Advanced Placement (AP) 23675

World Languages 23213

French 22589

Engineering 19607

Law 17108

Medicine 13966

SAT 10987

German 3389

🔢 Grades

High School 3423409

Middle School 2092250

College 1518097