HELP ASAP! 20 POINTS

Answer:

Polymers are long chain molecules that occur naturally in living things and can also be made by chemical processes in industry. Plastics are polymers, so polymers can be extremely useful.

Explanation:

Answer:

The correct answers are

Particles are dissolved

and light beam passes through invisibility

Explanation:

Odyssey

This is a Charles' Law problem: V1/T1 = V2/T2. As the temperature of a fixed mass of gas decreases at a constant pressure, the volume of the gas should also decrease proportionally.

To use Charles' Law, the temperature must be in Kelvin (x °C = x + 273.15 K). We want to solve Charles' Law for V2, which we can obtain by rearranging the equation into V2 = V1T2/T1. Given V1 = 25 L, T1 = 1200 °C (1473.15 K), and T2 = 25 °C (298.15 K):

V2 = (25 L)(298.15 K)/(1473.15 K) = 5.1 L.  

The volume of this gas will be "5.1 L".

Given:

             [tex]= 1473 \ K[/tex]

             [tex]= 298 \ K[/tex]

As we know,

→ [tex]\frac{V_1}{V_2} = \frac{T_1}{T_2}[/tex]

By substituting the values, we get

→ [tex]\frac{25 \ L}{V_2} = \frac{1473 \ K}{293 \ K}[/tex]

→    [tex]V_2 = \frac{25\times 298}{1473} \ L[/tex]

→         [tex]= 5.1 \ L[/tex]

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Answer:

I answered this in your recent post of this question.

Explanation:

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You know the number of moles of Mg that react: 6 moles.

You don't know (yet) how many moles of Mg₃N₂ are produced when 6 moles of Mg react.

The coefficients of each substance in the chemical equation tells us the molar ratio between the substances. The coefficient of Mg is 3, and the coefficient of Mg₃N₂ is 1 (coefficients of 1 are implied and omitted). So, for every 3 moles of Mg that react, 1 mole of Mg₃N₂ is produced.

We can use the proportion set up in the image to calculate the number of moles of Mg₃N₂ produced. In the first fraction, the green-boxed numerator should be our known number of moles of Mg, that is, 6 moles Mg. In the second fraction, we insert our molar ratio. Since we want the product of these two fractions to have the units "moles Mg₃N₂," the numerator in the second fraction should be 1 mole Mg₃N₂ and the denominator should be 3 moles Mg.

Our setup should look like this:

[tex]\frac{\textrm{6 moles Mg}}{1} \times \frac{\textrm{1 mole }\mathrm{Mg_3N_2}}{{\textrm{3 moles Mg}}} = \textrm{2 moles }\mathrm{Mg_3N_2}.[/tex]

Indeed, 2 moles of Mg₃N₂ are produced.

Answer:

2 moles of Mg₃N₂ are produced.

Explanation:

Answer:

An acidic solution has a high concentration of hydrogen ions (H +start superscript, plus, end superscript), greater than that of pure water.

The acidic solution indicates the highest concentration of hydrogen or the proton ion in the solution.

Acidity is the measure of the hydrogen ion in the solution by the pH scale and gives the acidic or basic characteristics to the solution.

The concentration of the hydronium or the hydroxide in the solution is a way to determine the acidic basic nature and the pH and pOH of the solution.

Therefore, in an acidic solution hydrogen ions are in the greatest concentration.

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Answer: 0.071 moles of excess reactant [tex](O_2)[/tex] will be left over.

Explanation:

To calculate the moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}[/tex]

a) moles of [tex]NO[/tex]

[tex]\text{Number of moles}=\frac{21.6g}{30.01g/mol}=0.720moles[/tex]

b) moles of [tex]O_2[/tex]

[tex]\text{Number of moles}=\frac{13.8g}{32g/mol}=0.431moles[/tex]

[tex]2NO(g)+O_2(g)\rightarrow 2NO_2(g)[/tex]

According to stoichiometry :

2 moles of [tex]NO[/tex] require 1 mole of [tex]O_2[/tex]

Thus 0.720 moles of  [tex]NO[/tex] require=[tex]\frac{1}{2}\times 0.720=0.360moles[/tex] of [tex]O_2[/tex]

Thus [tex]NO[/tex] is the limiting reagent as it limits the formation of product and [tex]O_2[/tex] is the excess regaent.

moles of [tex]O_2[/tex] left = (0.431-0.360) = 0.071 moles

Answer:

remote

Explanation:

i hope it helps

Answer:

Option D

Explanation:

As we know at

PV = nRT

at STP,

Pressure is  1 atm and temperature is 273 K

[tex]\frac{P_2}{P_1} = \frac{T_2}{T_1} \\P_2 = 1*(428 )/273\\P_2 = 1.567[/tex]

Hence, option D is correct

Answer:

Heat is the flow of thermal energy between two objects of different temperature whereas the thermal energy tells about how much is the transfer of energy due to temperature difference between two bodies. Hence thermal energy in transit gives heat

Explanation:

Forces are given many names, such as push, pull, thrust, lift, weight, friction, and tension. Traditionally, forces have been grouped into several categories and given names relating to their source, how they are transmitted, or their effects. The most important of these categories are discussed in this section, together with some interesting applications. Further examples of forces are discussed later in this text.

Answer:

Turning the lights off when they're not needed.

Answer:

1.2 x 10>24 (2.0)(6.022 x 10>23)

Explanation:

How many formula units are in 2.0 moles of Fe(NO3)2?

Mole measure the number of elementary entities of a given substance that are present in a given sample. 12.044×10²³ formula units are in 2 moles of Fe(NO₃)₂.

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number. Mole is inversely proportional to molar mass.

Mathematically,

Mole of Fe(NO₃)₂. =given number of atoms of Fe(NO₃)₂.÷ 6.022×10²³(Avogadro number)

mole of Fe(NO₃)₂= 2moles

Substituting the values

2=number of atoms of Fe(NO₃)₂.÷ 6.022×10²³

Number of atoms of Fe(NO₃)₂.=2×6.022×10²³

Number of atoms of Fe(NO₃)₂.=12.044×10²³

Therefore, 12.044×10²³ formula units are in 2 moles of Fe(NO₃)₂.

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Answer:

D. ms=+1/2.

Explanation:

Hello there!

In this case, since the quantum numbers are known as:

* Principal quantum number (n) which cannot be zero. The allowed values of n are therefore 1, 2, 3, 4, and so on.

* Angular quantum number (l) is able to be any integer between 0 and n-1. If n = 2, for example, l can be either 0 or 1.

* Magnetic quantum number (m) is able to be any integer between -l and +l. If l = 3, m can be either -3, -2, -1, 0, +1, +2 or +3.

* Spin Quantum Number (ms): ms = +½ or -½. Accounts for the orientation of the spin axis of an electron as it is able to spin in only one of two directions.

Thus, since the fourth quantum number is ms, spin, we infer that the answer is D. ms=+1/2 because it represents the positive spin on 2s^2.

Best regards!

Answer: ms = +1/2

Explanation: a pex

Answer:

1325 L

Explanation:

For this excersise we assume gasoline as an octane.

The combustion is:

2C₈H₁₈  +  25 O₂ →  16 CO₂  +  18H₂O

2 moles of octane react to 25 moles of oxygen, according to stoichiometry.

If we have 4 moles of gasoline, we need (4 . 25)/2 = 50 moles of oxygen.

We can apply the Ideal Gases Law to solve this.

We convert T° to Absolute Value

35°C + 273 = 308K

P . V = n . R . T

V = (n . R . T) / P → (50 mol . 0.082 mol.K/L.atm . 308K) / 0.953 atm

Volume = 1325 L

Answer:

D. 1 = gamma; 2 = alpha, 3 = beta

Explanation:

I apologize if this answer is late, but I got answered the question right on my "Types of Radioactive Decay" quiz :)

Hope this is helpful for others! :D

Based on the table, the type of radiation belong from 1 is the gamma rays, from 2 is the aplha rays and from 3 is the beta rays.

During the radioactive decay process, some amount of energy is released in the form of particles and that radiations will known as alpha rays, beta rays and gamma rays.

Hence 1 is the gamma rays, 2 is the aplha rays and 3 is the beta rays.

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Answer:

increase thickness of insulation

Explanation:

don't increase amount of heating because that's difficult and not efficient.

don't increase surface area of walls because that makes heat be lost quicker.

don't increase windows because windows lose heat worse than walls.

increase thickness of insulation because it's the most effiecient and effective method of keeping heat.

Answer:

My - Mercury

Very- Venus

Excited- Earth

Mother- Mars

Just- Jupiter

Served- Saturn

Us- Uranus

Nachos- Neptune

Explanation:

Mark me Brainliest?

Answer:

My very encouraging made just us nachos

Explanation:

My stands for Mercury

Very stands for venus

Encouraging- Earth

made- Mars

just- Jupiter

Us- Uranus

Nachos- Neptune

Answer:

Explanation:

A titration in general is used to determine the concentration of something with a solution of known solution. For acid, a base solution of known concentration is added slowly. The end-point is determined by using a pH indicator. When the acid is neutralized at the end, note the amount of base solution used and the strength of acid can be calculated.

Note that the quantity of base solution utilised and the acid strength can be estimated after the acid has been neutralised.

Titration is a method of chemical analysis where the quantity of a sample's constituents is established by adding a precisely measured amount of something else with which the component that is wanted will react in a specific, known proportion.

A burette, which is essentially a long, graded measurement tube with a stopper and a tube for injection at its bottom end, is used to gradually administer a standard solution of titrating reagent, and titrant, to a specified concentration. When the point of equal value is achieved, the addition is terminated. Note that the quantity of base solution utilised and the acid strength can be estimated after the acid has been neutralised.

Therefore, note that the quantity of base solution utilised and the acid strength can be estimated after the acid has been neutralised.

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Explanation:

1.All living organisms are composed of one or more cells

2. The cell is the basic unit of structure and organisation in organisms

3.Cells arise from pre-existing cells

Answer:

non independantly

Explanation:

Answer: It does not react with water, but reacts with most acids. It combines with oxygen at room temperature to form chromium oxide. Chromium oxide forms a thin layer on the surface of the metal, protecting it from further corrosion (rusting).

Explanation:

Answer:

I would say A but I'm not sure

When tin metal is placed into a solution of nickel (II) iodide then nothing will occur.

Reactivity series of the metals tells about the increasing or decreasing orders of the reactivity of the metals.

According to the reactivity series, reactivity of nickel metal is more than the tin metal. So, if we add tin metal in the solution of nickel (II) iodide then no reaction occurs. Because the reactivity of tin is less as compare to nickel metal so it is not possible for tin to replace the nickel metal and get dissolve.

Hence, option (C) is correct i.e. nothing.

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Answer/Explanation:

The greenhouse effect is a natural process that warms the Earth's surface. When the Sun's energy reaches the Earth's atmosphere, some of it is reflected back to space and the rest is absorbed and re-radiated by greenhouse gases.

Earth's surface warms up in the sunlight. At night, Earth's surface cools, releasing heat back into the air. But some of the heat is trapped by the greenhouse gases in the atmosphere. That's what keeps our Earth a warm and cozy 58 degrees Fahrenheit (14 degrees Celsius), on average.

Answer:

A

Explanation:

Thats the correct anwers

Answer:

2.5 billion years

Explanation:

Answer:

The Drip, The Gucci, The Swag, and The OG

Explanation:

Answer:

captures energy from the sun

Explanation:

Answer:

☁️Chlorophyll captures energy from the sun. ☁️