The overall equation for the electrolysis of aluminium oxide is:

2Al2O3

4Al + 302

Calculate the mass of oxygen produced when 2000 kg of aluminium oxide is

completely electrolysed.

Relative atomic masses (A):

O = 16

Al = 27

Precipitation is the fall of the condensed product to the ground. The freezing rain occurred because the air above the ground was above freezing.

Freezing rain is the form of precipitation that occurs when the rain droplets freeze upon contacting the ground surfaces. It is composed entirely of liquid water droplets.

Freezing rain occurred because there was not enough time for the water to freeze in a cloud, unlike the snow. Snow is another type of precipitation that forms when the temperature is low in the atmospheric surroundings.

Therefore, option C. the air above the ground surface was above freezing level explains the formation of freezing rain.

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Answer:

Titration is a procedure in which a solution is called the titrant. Whose concentration is known very accurately is dispensed by a burette and reacted with a known volume of another solution of unknown concentration is called the analyte. By measuring the amount of titrant needed to neutralize the analyte, you can determine the concentration of the analyte very accurately.The "end point" of a titration is the point at which the titration is complete, typically when an added indicator solution such as phenolphthalein changes color. The "equivalence point" is closely related to but not necessarily identical with the end point. The equivalence point is the point at which the number of moles (or equivalents) of titrant exactly equals the number of moles (or equivalents) of analyte.Ideally, the end point should exactly equal the equivalence point, but in the real world they are slightly different.

For example, titrate a hydrochloric acid analyte with a sodium hydroxide titrant, using phenolphthalein as an indicator. Phenolphthalein is colorless in acid solutions, and pink in base solutions, but no color change occurs until the pH of the solution reaches about 8.2, well into the basic range.

Titration is a laboratory technique used to determine the concentration of a substance in a solution.

It involves a controlled chemical reaction between a known volume of a solution with a known concentration (the titrant) and the solution with an unknown concentration (the analyte). The process is typically used in acid-base reactions or for various other types of chemical analyses.

Here's a brief overview of the titration process:

Preparation: The solution with the unknown concentration (analyte) is placed in a titration flask, and a few drops of an indicator (a chemical that changes color depending on the pH of the solution) are added to the analyte. The titrant, a solution with a known concentration, is filled in a burette.

Slow addition: The titrant is added slowly from the burette to the analyte solution in the flask. The mixture is swirled gently to ensure proper mixing.

Endpoint detection: The indicator's color change signals the completion of the reaction between the analyte and titrant. This point is called the endpoint. For example, in an acid-base titration, the endpoint is often reached when the solution changes color due to the neutralization reaction.

Volume measurement: The volume of the titrant used to reach the endpoint is recorded. The volume is typically measured with high precision since it is used to calculate the unknown concentration of the analyte.

Calculation: Using stoichiometry and the volume of titrant used, the unknown concentration of the analyte can be determined.

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Filling in the gaps in the excerpt below

Molecules that do not  __Dissociate__________ (or come apart) in solution are called ___Non-electrolyte substances_________ . Most of these substances are covalently bonded __and do not conduct electricity__________ (e.g., glucose, urea, and creatinine). In contrast, a(n) ___Electrolyte_________ is any substance that dissociates in solution to form Salts

Electrolytes are substances that conduct electricity because they readily ionize when placed in a solution. while Non-electrolytes do not readily conduct electricity because they do not dissociate  into ions when placed in a solution.

Hence we can conclude that the answers to your questions are as listed above.

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Answer:

*carboxylic acid

*other groups containing oxygen and nitrogen

* Alkenes and Alkynes

Explanation:

substances containing double ot tripple bonds are called Alkenynes

Answer:

61.994 g

Explanation:

first of all the result is not balanced but here is tje answer anyways

To find the weight we have to add their molar mass

12.011+(15.99×2)+(1.002×2) +15.999=61.994

Answer:Carbon enters the soil through the decomposition of organic material. When plants die or leaves fall off of trees, for example, they fall to the soil

Explanation:

Answer: 0.18 M

Explanation:

Initial molarity, M1 = 0.8 M

Initial olume, V1 = 225 ml

Final volume, V2 = 1000 ml

Final Molarity, M2 = M1V1/V2

= 0.8 x 225/1000

= 0.18 M

Taking into account the definition of Volume to Volume Percentage (% V/V), 61.3548 mL of isopropanol are in a 89.7 mL sample of the rubbing alcohol solution.

Volume to Volume Percentage (% V/V) is a measure of concentration that indicates the volume of solute per 100 volume units of solution.

In other words, the percentage %v/v indicates the volume of solute (in mL) that is dissolved in 100 mL of solution.

The %v/v of a solution is determined by the following expression, which is multiplied by 100 to express it as a percentage:

[tex]v/v=\frac{volume of solute (mL)}{volume of solution(mL)} x100[/tex]

In this case, you know:

Replacing in the definition of %v/v:

[tex]68.4=\frac{volume of solute (mL)}{89.7 mL} x100[/tex]

Solving:

volume of solute= (68.4× 89.7 mL)÷ 100

volume of solute= 61.3548 mL

Finally, 61.3548 mL of isopropanol are in a 89.7 mL sample of the rubbing alcohol solution.

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Answer:

51 579 C

Explanation:

I will assume the PRESSURE remains constant

then

V1 /T1  = V2/T2       T will be in Kelvin

                                25 C =  298.15 K

2.3 l / 298.15 K    =  400 l / T2

solve for T2 = 51852.17 K   = 51579 C

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Answer:

your answer should be 0.57 atm

Answer:How many moles are there of a 2 M solution with a volume of 17.95 liters = 35.9 moles !

Explanation: The formula for calculating the molarity of the solution is expressed as Molarity= mole/volume

Molarity = 2 M

Volume=17.95L

Substitute the given parameters into the formula … and you get

mole=molarity x volume

Mole=2M x 17.95L

Mole=35.9moles

moles of the solution is 35.9 moles

Hope this helps if so mark Brainalist thanks

The  pH refers to the negative logarithm of the hydrogen ion concentration of a solution.

The term pH refers to the negative logarithm of the hydrogen ion concentration of a solution. Let us now solve each question.

a) Since pH = 2.90

[H^+] = Antilog(-2.90) = 1.26 * 10^-3 M

[OH^-] = 1 * 10^-14/ 1.26 * 10^-3 = 7.9 * 10^-12 M

pOH = 14 - 2.90 = 11.1

b) Since pH = 3. 86

[H^+] = Antilog(-3.86) = 1.38 * 10^-4 M

[OH^-] = 1 * 10^-14/ 1.38 * 10^-4 = 7.2 * 10^-11 M

pOH =  14 - 3.86 = 10.14

c)Since pH = 10.81

[H^+] = Antilog(-10.81) = 1.55 * 10^-11 M

[OH^-] = 1 * 10^-14/ 1.55 * 10^-11 = 6.5 * 10^-4 M

pOH = 14 -  10.81 = 3.19

d) Since pH = 4.11

[H^+] = Antilog(-4.11) = 7.8 * 10^-5 M

[OH^-] = 1 * 10^-14/7.8 * 10^-5 = 1.3 * 10^-10M

pOH = 14 - 4.11 = 9.89

e) Since pH = 11.61

[H^+] = Antilog(-11.61) =2.45 * 10^-12 M

[OH^-] = 1 * 10^-14/2.45 * 10^-12 = 4.1 * 10^-3 M

pOH = 14 - 11.61 = 2.39

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Answer:

B

Explanation:

Answer:

I think c is the right answer

Answer

Laws that are used by astronomers to learn about stars indirectly are as given below:-

We need moles of Ca(OH)_2

Molar mass of Ca(OH)_2=74g/mol

Now

Option C

The mass of Ca(OH)₂ in the given solution is approximately 2.78 grams, which corresponds to option C) 2.78 g.

Given: Volume = 1500 mL, Concentration (Molarity) = 0.0250 M, and Compound = Ca(OH)₂ .

First, convert mL to L: Volume = 1500 mL × (1 L / 1000 mL) = 1.5 L.

Use the formula for calculating the number of moles: Moles = Concentration × Volume.

Moles = 0.0250 mol/L × 1.5 L = 0.0375 mol.

The molar mass of Ca(OH)₂  can be calculated:

Ca(OH)₂  molar mass = (1 * atomic mass of Ca) + (2 * atomic mass of O) + (2 * atomic mass of H)

= (1 * 40.08 g/mol) + (2 * 16.00 g/mol) + (2 * 1.01 g/mol)

= 74.09 g/mol.

Now, calculate the mass using the calculated moles and molar mass:

Mass = Moles × Molar mass

Mass = 0.0375 mol × 74.09 g/mol = 2.78 g.

Therefore, the mass of Ca(OH)₂  in the given solution is approximately 2.78 grams, which corresponds to option C) 2.78 g.

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The complete question is:

What mass of Ca(OH)₂ is contained in 1500 mL of 0.0250 M Ca(OH)₂ solution?

A) 1.85 g

B) 2.34 g

C) 2.78 g

D) 3.17 g

The new volume of the air bubble that has an initial volume of 5.0 ml released at the bottom of a lake where the pressure is 3.0 atm is 15mL.

The volume of a given gas can be calculated by using the following formula:

P1V1 = P2V2

Where;

5 × 3 = 1 × V2

15 = V2

V2 = 15mL

Therefore, the new volume of the air bubble that has an initial volume of 5.0 ml released at the bottom of a lake where the pressure is 3.0 atm is 15mL.

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Answer: It will increase

Explanation:

Downy Woodpecker

Reading and Annotating the Question

One way to narrow the choices is to read the question first. While reading the question, annotate for important phrases. I would underline "dead branches and dying trees" and "habit would be most affected."

Reading and Annotating the Chart

Now that we have read the question, it is time to read the chart. While you read, check for words or phrases that relate to the phrases we underlined in the question. When I read the chart I noticed the phrase "decaying trees" under the Downy Woodpecker. Since the Downy Woodpecker depends on decaying trees, they would be heavily affected by the removal of dying trees.

Process of Elimination

To check our answer we can use the process of elimination.

A) We can eliminate the Baltimore Oriole because it relies on "tall trees," not dying trees.

B) The Barn Swallow is also incorrect because they nest "under roofs," which is not affected by the removal of any trees.

D) Finally, the Belted Kingfisher is wrong because they build nests in "tunnels or burrows," which is also unrelated to the removal of trees.

Infrared light can hit the ground after being absorbed by things in the Earth's atmosphere like water vapor, carbon monoxide, methane, and other traces of gases, which absorb the longer wavelengths of outgoing infrared radiation from the Earth's surface. The gases emit infrared radiation down to Earth and out into space.

Answer:

Water vapor, carbon dioxide, methane, and other trace gases in Earth's atmosphere absorb the longer wavelengths of outgoing infrared radiation from Earth's surface. These gases then emit the infrared radiation in all directions, both outward toward space and downward toward Earth.

Explanation:

Answer:

Explanation:

The formula for concentration is C = n/V

Where C represents concentration in mol/L.

n represents moles in mol.

V respresents volume in L.

You have 550 mL, let's convert it to L (1000 mL= 1L)

550 mL / 1000 = 0.55 L

We got V and we need n. We can find n by this formula:

n = m/M

m represents mass in g.

M represents molar mass in g/mol.

We are given grams of iron (II) chloride (FeCl2)

Find the molar mass by the periodic table: 55.85 + (2*35.45) = 126.75 g/mol.

n = (350 g) / (126.75 g/mol) = 2.76134 mol

Back to our first formula: C = n / V

C = (2.76134 mol) / (0.55 L) = 5.0206 mol/L.

to 3 significant digits it's 5.02 mol/L, and that is how you find concentration.

K3N : Mg3N

1 : 1

X : 2,1

n(K3N) = 2,1 mol

M(K3N) = 39×3 + 32

= 149

m= nM

= 2,1 × 149

= 312,9g

Answer:

give off carbon to the air. Giving off carbon allows them to make energy storage molecules.

Explanation:

Trees use energy from the sun to create sugars through a process called photosynthesis and without these sugars as an energy source a tree cannot grow or ultimately survive. A study by Thomas Givnish found that the process of photosynthesis is directly impacted by the amount of sunlight that hits a tree's leave.

Sunlight and Tree Shape – Crandall Park Trees

Answer:

The substances which neutralize the acids of the stomach are called antacids. Acidity in the stomach causes the sensation of heartburn, antacids are taken to relieve this sensation. They are taken orally to suppress the effects of acidity.

The minerals effervesce (produces a bubbling, fizzing reaction) in hydrochloric acid is calcite. The correct option is D, calcite.

Calcite is a mineral that is very hard, and highly reactive.

It is present in many colors, white, yellow, orange, red, green, and blue.

In Ancient Egypt, calcite was used to carve many things, such as bast, alabaster, etc.

Thus, the correct option is D, calcite.

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80 molecules of [tex]NH_{3}[/tex] will be formed if 60 molecules of [tex]N_{2}H_{4}[/tex] decomposes into [tex]N_{2}[/tex] and [tex]NH_{3}[/tex]

The smallest particle of a substance has all of the physical and chemical properties of that substance. Molecules are made up of one or more atoms.

Just balance the reaction:

[tex]3N_{2}H_{4}\to N_{2}+4NH_{3}[/tex]

Now you can see that every 3 molecules of [tex]N_{2}H_{4}[/tex]4 molecules of [tex]NH_{3}[/tex].

For 60molecules of [tex]N_{2}H_{4}[/tex] we scale up these numbers by a factor of 60/3 = 20.

Therefore 4x20 = 80 molecules of  [tex]NH_{3}[/tex] are formed.

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Answer:

The molarity of the solution is

5.1 mol/L

.

The solution is said to be

5.1 molar

.

The shorthand way to indicate molarity is

5.1 M

, which is pronounced

5.1 molar

, and is how it is written on the label of its container.

Explanation:

Molarity (M)

=

moles of solute

liters of solution

The volume of the solution is given in mL. The volume is required to be in liters, so

975 mL

must be converted to liters.

1 L=1000 mL

975

mL

×

1

L

1000

mL

=

0.975 L

Molarity (M)

=

5.0

mol

0.975

L

=

5.1 mol/L

rounded to two significant figures

Answer link

Answer:

3m

Explanation:

Molarity equation = Moles of solute/liters of solution

Plug values in and get 3 :)

I am not sure the units are correct so check those but that should be the answer

Answer: PV = nRT

A gas at STP... This means that the temperature is 0°C and pressure is 1 atm.

R is the gas constant which is 0.08206 L*atm/(K*mol)

Rearranging for volume

V = nRT/P

The temperature and number of moles are held constant. This means that this uses Boyle's Law. (The ideal gas law could be manipulated to give us this result when T and n are held constant.)

PV = k

where k is a constant.

This means that

P₁V₁ = k = P₂V₂

P₁V₁ = P₂V₂

(1 atm) * (1 L) = (2 atm) * V₂

V₂ = 0.5 L

The new volume of the gas is 0.5 L.

Explanation: