Solve 21 and 22 please

Answer:

answer

Cold Front - a zone separating two air masses, of which the cooler, denser mass is advancing and replacing the warmer.

Warm Front - a transition zone between a mass of warm air and the cold air it is replacing.

Stationary Front - a front between warm and cold air masses that is moving very slowly or not at all.

Answer:

the United States and the Soviet Union.

Explanation:

Basically we were in toe to toe with the russians for space explorations like who's gonna get to space first or moon or do such explorations

Answer: 63.9

Explanation:

Answer: C

Explanation:

Zinc is the most active metal among the options.

Ni²⁺ is  most likely to be reduced. Therefore, the correct option is option C among all the given options.

In a half-reaction known as reduction, a chemical species lowers its oxidation number, typically by acquiring electrons. Oxidation, which results in the loss of electrons, makes up the reaction's other half. Redox reactions are formed when reduction and oxidation work together (reduction-oxidation equals redox).

You could think of reduction as the antithesis of oxidation. Oxidation and reduction in some reactions can be thought of as the transfer of oxygen. Here, oxygen is gained by oxidation while it is lost through reduction. Ni²⁺ is  most likely to be reduced.

Therefore, the correct option is option C. Ni²⁺ is  most likely to be reduced.

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Answer:

It works by separating the fuel from the oxygen. The oxygen comes from the air. It is the same oxygen we breathe. Since the oxygen has to be in contact with the fuel, if you can coat the fuel with something that keeps the oxygen away, the fire will go out which is what the fire extinguisher does.

Gravity the dominant force among planets because it acts at long distances.

Gravity is the weakest force as compared to the forces but it is the most dominant force because it has the longest range.

So we can conclude that Gravity the dominant force among planets because it acts at long distances.

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please try to keep questions acedemic related

it does no good for questions like this to be on here when others need help, try to keep your questions..

  - Partained to the particular subject
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no hard feelings, though this question and answer will be deleted by moderators soon so just keep all that in mind ^^

Answer:

Probably stop taking the prescribed durg and contact your pharmacist and your doctor that gave you your prescription asap.

Explanation:

Both of those health professionals will assist the patient in understanding how to go about the next steps for side effect relief.

Answer:

"the energy that is associated with temperature" ✔️

Explanation:

Thermal Energy = Heat

Ex: The sun has thermal energy.

Ex: The oven radiates thermal energy

I hope this helps, you understand!!

The statement describes thermal energy is as

So, option D is correct one

The energy posses by the particles or system due to their temperature is called thermal energy.

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Answer:

261.1 N

Explanation:

Force = mass × acceleration due to gravity

Force is also known as weight. So:

Weight = 70 × 3.73 = 261.1 N

Answer:

v2=40.35L

Explanation:

p1v1/t1=p2v2/t2

v2=t2p1v1/t1p2

v2=984*760*22.4/273.15*1520

v2=40.35 L

If two liquid solutions are mixed together, the solute would be the one with the lower volume while the solvent would be the solution with the higher volume.

The mixing of two liquids requires that one is a solute while the other is a solvent.

Thus, the solution with the higher volume acts as the solvent while the one with the lower volume act as the solute.

For example, a solution made by mixing 25% water with 75% alcohol has water as the solute and alcohol as the solvent.

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almost the same

just different in bond

Answer:

easily forming bonds w/ atoms of other elements and combining w/ oxygen atoms to form new substance

The amount of 0.25 M KI solution is needed is 0.38 L.

Solution is defined as a homogeneous mixture of two or more substances in relative amounts that can be continually altered up to what is known as the limit of solubility.

It can also be defined as a combination of one substance dissolved in another with the same properties throughout.

The solution can be homogenous or heterogenous mixture.

2 KI + Pb(NO3)2 → Pbl₂ + 2 KNO3

As per the reaction

The ratio is KI : Pb(NO3)2 is 1:1

So, we use M1V1 = M2V2

As given, M1 = 0.25 M

                M2 = 0.75 M

                V2 = 0.125 L

So, V1 = M2 V2 / M1

      V1 = 0.75 x 0.125 / 0.25

       V1 = 0.38 L

Thus, the  amount of 0.25 M KI solution is needed is 0.38 L.

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Answer:

35.9 ml

Explanation:

Start with the balanced equation:

3CuCl2(aq)+2Na3PO4(aq)→Cu3(PO4)2(s)+6NaCl(aq)

This tells us that 3 moles of CuCI2 react with 2 moles Na3PO4-

∴  1 mole CuCl2 will react with 2/3 moles Na3PO4

We know that concentration = moles/volume i.e:

c= n/v

∴n=c×v

∴nCuCl2=0.107×91.01000=9.737×10−3

I divided by 1000 to convert ml to L

∴nNa3PO4=9.737×10−3×23=6.491×10−3

v=nc=6.491×10−30.181=35.86×10−3L

∴v=35.86ml

Answer:

NaCl

Explanation:

Answer:

NACL

|•ANSWER,•|.....

hope it helps u.

The compound is ethanol

The answer is  moving left to right across a period the nucleus has a greater pull on the outer electrons and the atomic radii decreases.

The atomic number or nuclear charge number (symbol Z) of a chemical element is the charge number of an atomic nucleus.

Atomic Number (generally ) =  Number of Protons

The atomic number can be used to uniquely identify ordinary chemical elements.

In an ordinary uncharged atom, the atomic number is also equal to the number of electrons.

The atomic number increases moving left to right across a period and subsequently so does the effective nuclear charge.

Therefore, moving left to right across a period the nucleus has a greater pull on the outer electrons and the atomic radii decreases.

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Answer:

A a mountain

Explanation:

this is becuase the two plates are pushing into each other, so all that rock will go where theres the least resistance, up

you can see this when you place your hands (palms down facing each other where the tis touch) on a table or flat surface, if you slowly bring them together ((DONT DO IT HARD OR FAST else u may hurt urself)) your fingertips will begin to want to rise up

the answer is not B becuase:

a canyon is formed when erosion carves into the earth, this oes NOT need to happen at a fault line and deffinitally does not happen n converging plates as shown

the answer is not D becuase:

a ridge is formed when ne plate pushes under the other, pushing that second plate upward, when this happens it forms a chain of mountains, though this is simmilar to the correct answer, the diagram does not show the plates undernieth one another, rather they are pushing against each other

the answer is not C becuase:

a fault is where two plates are moving away from each other, creating a canyon like structure, this is not a canyon however, for it is not formed by erosion, most faults can be found underwater since oceans usually fill in the gap where rock used to be

hope this helps you, sorry if its a lot of reading ^^"

Answers:

1st: 189.6 g/mol

2nd: 0.1357 L

3rd: 1.41 M

Explanation:

Finding Molar Mass:

SnCl2 = Tin(II) Chloride

Tin has a molar mass of 118.71 g/mol

Chloride has a molar mass of 35.453 g/mol

Chloride*2 = 70.906

118.71 + 70.906 ≈ 189.6 g/mol

Finding Liters of Solution:

L = mL/1000

135.7 mL / 1000 = 0.1357

Finding Molarity:

molarity = moles of solute / liters of solution

M = (36.4g /  189.6g) / 0.1357 L = 1.41 M

Hope this helped ;)

Commercial agriculture often leads to water-quality problems as a result of run-offs and agrochemical discharge.

Most commercial agriculture requires the use of agrochemicals and fertilizers.

Agrochemicals such as insecticides and herbicides are poisonous to aquatic biodiversity when run-offs are discharged from farmlands to water bodies.

Fertilizer run-offs into water bodies also cause nutrient enrichment, leading to eutrophication.

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Answer:

n = 0.487⋅mol

Explanation

n=PVRT

=0.4⋅atm×30⋅L0.0821⋅L⋅atm⋅K−

1⋅mol−1×300⋅K

=0.487⋅mol

The average temperature during the ice age was around 46 degrees Fahrenheit although the polar regions were far colder, around 25 degrees Fahrenheit which is colder than the global average.

The monthly mean temperature: It is calculated by adding the daily mean temperatures for each day of the month and dividing the total by the number of days in a month.

The average global temperature during the period known as the Last Glacial Maximum from roughly 23,000 to 19,000 years ago was about 46 degrees Fahrenheit (7.8 degrees Celsius), some 13 degrees Fahrenheit (7 Celsius) colder than 2019, the researchers said.

A team of scientists has nailed down the temperature at the peak of the last ice age, a time known as the ast Glacial Maximum, to about 46 degrees Fahrenheit.

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Explanation:

Oxidation state of Nitrogen in NO is +2

Answer:

+2

Explanation: