Why is it necessary for astronauts on the International Space Station to generate and recycle oxygen?

Question 1 options:

Oxygen provides energy for the station's fuel tanks.


There is not enough oxygen in space to sustain life.


Oxygen protects the space station from radiation.


Oxygen is a by-product of human respiration.

The products benzoin and meso-hydro benzoin melting points are same. Their temperature is 13341 degrees Celsius. Using the melting point method makes it challenging to directly determine. It would be necessary to determine the reaction's end product and then measure the melting point.

The thermal analysis that is most usually used to describe solid crystalline materials is melting point determination. It is used to identify solid crystalline chemicals and to assess their purity in research and development as well as in quality control in different industry areas.

The melting values of the products were between benzoin and meso-hydro benzoin 135 and 137, indicating that the molecule is likely benzoin because they are so similar to benzoin's melting points (135 to 137). Compared to hydroxybenzoic acid, benzoin has a melting point range that is closer to the finished product.

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Explanation

2 FeCl3 + SnF2 => 2 FeF2 + SnCl4

The half-reaction: oxidation

The half-reaction: reduction

Answer: Sn is oxidized and Fe is reduced

The heat absorbed by the solution is 386.9 cal.

First, we need to calculate the heat absorbed by the solution using the formula:

q = m × c × ΔT

Where q is the heat absorbed, m is the mass of the solution, c is the specific heat constant, and ΔT is the change in temperature.

m = 45.4 g

c = 1 cal/g oC

ΔT = 31.5 oC - 23.0 oC = 8.5 oC

Substituting the values in the formula, we get:

q = 45.4 g × 1 cal/g oC × 8.5 oC

q = 386.9 cal

Therefore, the heat absorbed by the solution is 386.9 cal.

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Answer:The law of conservation of mass states that in a chemical reaction mass is neither created nor destroyed. ... The carbon atom changes from a solid structure to a gas but its mass does not change. Similarly, the law of conservation of energy states that the amount of energy is neither created nor destroyed.

Explanation:

Approximately 766.08 grams of oxygen are required to completely react with 240g of C₂H₆.

To determine the amount of oxygen required to completely react with 240g of C₂H₆ (ethane), we need to set up a balanced chemical equation for the combustion of ethane.

The balanced equation for the combustion of ethane is as follows:

C₂H₆ + O₂ → CO₂ + H₂O

From the balanced equation, we can see that the stoichiometric ratio between C₂H₆ and O₂ is 1:3. This means that for every one mole of C₂H₆, three moles of O₂ are required for complete combustion.

To calculate the amount of oxygen required, we need to convert the given mass of C₂H₆ to moles using its molar mass, and then use the stoichiometric ratio to determine the moles of O₂ required. Finally, we can convert the moles of O₂ back to grams using the molar mass of oxygen.

The molar mass of C₂H₆ is calculated as follows:

(2 x atomic mass of carbon) + (6 x atomic mass of hydrogen)

(2 x 12.01 g/mol) + (6 x 1.01 g/mol) = 30.07 g/mol

Now, we can proceed with the calculation:

Calculate the moles of C₂H₆:

moles of C₂H₆ = mass of C₂H₆ / molar mass of C₂H₆

moles of C₂H₆ = 240 g / 30.07 g/mol ≈ 7.98 mol

Determine the moles of O₂ using the stoichiometric ratio:

moles of O₂ = moles of C₂H₆ x (3 moles of O₂ / 1 mole of C₂H₆)

moles of O₂ = 7.98 mol x 3 ≈ 23.94 mol

Convert moles of O₂ to grams:

mass of O₂ = moles of O₂ x molar mass of O₂

mass of O₂ = 23.94 mol x 32.00 g/mol = 766.08 g

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Answer: A

Explanation:

As one increases the other goes in a straight line.  It is called a direct proportionality.  Forms a linear graph.

The number of positive charge units (protons) in the nucleus is defined as the atomic number, which is the single most significant property of an atom. Atomic numbers are typically represented by the symbol Z.

A component of an element is an atom. A specific element only has one kind of atom per atom. Protons, neutrons, and electrons, which are subatomic particles, make up the remainder of an atom. Chemical reactions can result in the combination of elements to create molecules. The number assigned to a chemical element by its atomic number in the periodic system places the elements in ascending order of the number of protons in their nuclei.

The number of positive charge units (protons) in the nucleus is defined as the atomic number, which is the single most significant property of an atom. Atomic numbers are typically represented by the symbol Z.

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Answer:

I believe the correct answer is cold surfaces.

Explanation:

Answer:

C

Explanation:

Answer:

248

Explanation:

Na2 = 23 x 2

S2 = 32 x 2

O3 = 16 x 3

5h20 = 5 x (2+16)

add these and u get 248

Answer: There are two significant figures because any zeros in front of non-zero numbers are not sig figs meaning that only the one and three count.

Answer:

It bonds with the added H+ or OH in solution.

Explanation:

Answer:

A. They both use turbines.

Explanation:

Both are renewable energy sources, obtained when the energy of the wind (in the case of wid power) and the energy of the sea (in the case of hydroelectric power), move the fins of a generator that drives a turbine.

ANSWER

The number of moles of CO2 is 2.69 moles

EXPLANATION

Given that;

The mass of CO2 is 118.6 grams

Follow the steps below

The molar mass of CO2 is 44.01 g/mol

Therefore, the number of moles of CO2 is 2.69 moles

Based on the given information, we can conclude that substance X and substance Y are solids and did not filter through the filter paper into the flask. Option D

Substance Z, on the other hand, is a liquid that passed through the filter paper and collected in the flask.

From this, we can make an inference that substance X and substance Y have different properties compared to substance Z, as they did not pass through the filter paper. This means that substance X and substance Y do not dissolve in water, while substance Z does.

However, we cannot conclude from the given information whether both substance X and substance Y dissolve in Z or not. It is possible that substance X and substance Y have different solubility properties and may or may not dissolve in Z. Therefore, we cannot choose option A or option D.

Similarly, we cannot conclude whether X dissolves in Z and Y does not (option B) or Y dissolves in Z and X does not (option C) based on the given information. Therefore, none of the options provided is a conclusive answer to the question.

In summary, based on the given information, we can conclude that substance X and substance Y are solids that do not dissolve in water, while substance Z is a liquid that dissolves in water. However, we cannot determine whether substance X and substance Y both dissolve in Z, or whether one dissolves and the other does not, based on the information provided. Option D

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The mass of the HBr produced is 71.6 g.

We know that we can be able to obtain the amount of the product that is obtained from the stoichiometry of the reaction. The stoichiometry would try to find the ratio in which the reactants and the products are obtained in the balanced reaction.

Now we know that this reaction is 1:1 as is obvious.

If 1 mole of ethane produces 1 mole of HBr

0.884 also produces 0.884 moles of HBr (this shows that the reaction is 1:1).

Mass of the HBr produced =  0.884 moles  * 81 g/mol

= 71.6 g

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Answer:

Because of pollution and other factors that contain carbon dioxide are warm, and it heats up the air.

Explanation:

Carbon dioxide levels in the Earth's atmosphere have been steadily decreasing. Carbon dioxide has a longer average lifetime in the atmosphere. The warming effect associated with carbon dioxide has remained unchanged

The homologous series that CH₂CH₂ CH₂CH₂ belongs to is alkene.

Homologous series is any series of aliphatic organic compounds whose members differ only in the addition of a CH₂ group.

The members of the homologous series are as follows;

Alkene is an unsaturated, aliphatic hydrocarbon with one or more carbon–carbon double bonds.

According to this question, the above given compound is butene (a member of alkene) because it has four carbon atoms and 8 hydrogen atoms.

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Answer:

A

Explanation:

I had the exact same question on my test and I got it right

Answer:b

Explanation:

Answer:

A

Explanation:

ez l.m.a.o.

The concentration of the NaOH solution required for the reaction given the data is 0.44 M

H₂SO₄ + 2NaOH —> Na₂SO₄ + 2H₂O

From the balanced equation above,

CaVa / CbVb = nA / nB

(0.1 × 22) / (Cb × 10) = 1 / 2

2.2 / (Cb × 10) = 1 / 2

Cross multiply

Cb × 10 = 2.2 × 2

Cb × 10 = 4.4

Divide both side by 10

Cb = 4.4 / 10

Cb = 0.44 M

Thus, the concentration of the NaOH solution is 0.44 M

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Digital road maps are different from paper and road maps in that they allow users to plan routes before a trip, they can be used anywhere in the world, and they can be updated almost immediately. They also show both major and minor roads in a region.

Digital road maps are a type of digital map that is based on GIS data. This data is collected from various sources and is used to create a detailed representation of the real world.  The digital road map allows the user to zoom in and out and to see different levels of detail, depending on their needs. They also allow the user to search for specific locations, find directions, and plan routes before they begin their trip.

On the other hand, paper maps are usually printed on paper and can be difficult to read in low light conditions. They are also limited in the amount of detail that they can show, and they may not always be up-to-date.

Road maps, on the other hand, are a type of map that shows roads and highways in a region. They may include some additional features such as rest areas, gas stations, and other points of interest. Road maps are typically printed on paper and are often used for navigation while driving. They are not as detailed as digital road maps, and they can quickly become outdated as new roads are built.

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Answer:

2.0 L

Explanation:

P1= first pressure 

P2= second pressure 

V1= first volume 

V2= second volume 

P1V1 = P2V2=
(5.7 atm)(350 mL) = (1.0atm)V2

V2= (5.7 atm)(350 mL) / (1.0 atm)=

V2= 1.99500 L = 2.0 L

Answer:

A, B, C, D, and A

Explanation:

hope this helps

Answer:

0.0432 M

Explanation:

To find the new molarity, you need to (1) calculate the number of moles (using the molarity ratio), then (2) calculate the new volume, and then (3) calculate the new molarity. The moles in the first molarity is the same amount in the new molarity. The final answer should have 3 sig figs like the given number with the smallest amount of moles.

(Step 1)

95.00 mL / 1,000 = 0.095 L

Moles:

Molarity = moles / volume

0.157 M = ? moles / 0.095 L

0.0149 = ? moles

(Step 2)

250.0 mL / 1,000 = 0.25 L

New Volume:

0.25 L + 0.095 L = 0.345 L

New Molarity:

Molarity = moles / volume

Molarity = 0.0149 moles / 0.345 L

Molarity = 0.0432 M