Choose ALL the answers that apply.

Sound _____.

travels in transverse waves
requires a medium to travel through
travels most slowly through solids
speeds up when temperature is increased
is changed into electrical impulses by the cochlea

polyvinyl chloride is the monomer that is polymerized to create PVC (also known as chloroethene). A colourless gas called vinyl chloride is created when chlorine and ethylene combine.

PVC is a synthetic polymer that finds extensive use in numerous construction and industrial processes. It is a thermoplastic substance that is simple to extrude or mould into different sizes and forms. Vinyl chloride, which serves as the monomer for PVC, is polymerized using a free radical mechanism to create long chains of PVC molecules. PVC is a common material for pipes, cables, flooring, roofing, and other building materials because of its strong resistance to chemicals, weathering, and impact. Nonetheless, there is continuing research into creating more environmentally friendly substitutes because PVC production and disposal can have a negative influence on the environment.

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The pressure inside the container is 6.7 atm that can be calculated using ideal gas law.

The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).

We have the ideal gas equation: P x V = n x R x T

Here, P (pressure, atm), V (volume, L), n (mole, mol), R (ideal gas constant, 0.082), T (temperature, Kelvin). Since the container is evacuated and then sealed, the volume of the body of gas is the volume of the container.

So we can calculate the pressure by

P = n x R x T / V

where as,

n = 41.1 g / 44 g/mol = 0.934 mol

Hence P = 0.934 x 0.082 x 298 / 3.4 L = 6.7 atm

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Answer:

true

Explanation:

Solid, liquid and gases are the only three States of matter

Answer:

-1, -2

Explanation:

West is left south is down east is right

The statements  'The precision is a measure of the spread of expected values for a given measurement .'  does not accurately describe the precision of a measurement .

Precision refers to how close measurements of the same item are to each other . Precision is independent of accuracy . That means it is possible to be very precise but not very accurate, and it is also possible to be accurate without being precise . The best quality scientific observations are both accurate and precise .

It is also define in one term as the quality or state of being precise .

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Answer:

D

Explanation:

D because scientists study cells to know how to help people when they are sick

hope this helps (it might be wrong)

A kiln is a specialized oven used in ceramic art to harden clay objects to a temperature that causes irreversible chemical changes in the clay, resulting in a permanent transformation of the material into ceramics.

What is a kiln and how is it used in ceramic art?

A kiln is a specialized oven used in ceramic art to harden clay objects to a temperature that causes irreversible chemical changes in the clay, resulting in a permanent transformation of the material into ceramics.

The temperature required for this transformation depends on the type of clay being used and the desired final product, but it typically ranges from around 1,000 to 1,400 degrees Celsius (1,800 to 2,550 degrees Fahrenheit). Kilns can be used for a variety of ceramic techniques, including firing, glazing, and decorating clay objects.

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Answer:

Option A. LR = N2O4, 45.7g N2 formed

Explanation:

The balanced equation for the reaction is given below:

N2O4(l) + 2N2H4(l) → 3N2(g) + 4H2O(g)

Next, we shall determine the masses of N2O4 and N2H4 that reacted and mass of N2 produced from the balanced equation. This is illustrated below:

Molar mass of N2O4 = 92.02 g/mol

Mass of N2O4 from the balanced equation = 1 x 92.02 = 92.02 g

Molar mass of N2H4 = 32.05 g/mol

Mass of N2H4 from the balanced equation = 2 x 32.05 = 64.1g

Molar mass of N2 = 2x14.01 = 28.02g/mol

Mass of N2 from the balanced equation = 3 x 28.02 = 84.06g

Summary:

From the balanced equation above,

92.02g of N2O4 reacted with 64.1g of N2H4 to produce 84.06g of N2.

Next, we shall determine the limiting reactant. This can be obtained as follow:

From the balanced equation above,

92.02g of N2O4 reacted with 64.1g of N2H4.

Therefore, 50g of N2O4 will react with = (50 x 64.1)/92.02 = 34.83g of N2H4.

From the calculations made above, we can see that only 34.83g out 45g of N2H4 is required to react completely with 50g of N2O4.

Therefore, N2O4 is the limiting reactant and N2H4 is the excess reactant.

Finally, we shall determine the mass of N2 produced from the reaction.

In this case the limiting reactant will be used as it will produce the maximum yield of N2 since all of it is used up in the reaction.

The limiting reactant is N2O4 and the mass N2 produced can be obtained as illustrated below:

From the balanced equation above,

92.02g of N2O4 reacted to produce 84.06g of N2.

Therefore 50g of N2O4 will react to produce = (50 x 84.06)/92.02 = 45.7g of N2.

Therefore, 45.7g of N2 were produced from the reaction.

At the end of the day,

The limiting reactant is N2O4 and 45.7g of N2 were produced from the reaction.

Answer:

\(m_{mixture}=52g\)

Explanation:

Hello.

In this case, since your mixture is composed by sugar and water, its mass turns out:

\(m_{mixture}=m_{sugar}+m_{water}\)

Whereas the mass of sugar is 2 g and the mass of water is 50 g, therefore, the result is:

\(m_{mixture}=2g+50g\\\\m_{mixture}=52g\)

Best regards.

The volume units that are greater than one liter are kiloliter and megaliter. Kiloliter is equal to 1,000 liters, and megaliter is equal to 1,000,000 liters.

The other volume units listed are smaller than one liter. Milliliter is equal to one-thousandth of a liter, centiliter is equal to one-hundredth of a liter, deciliter is equal to one-tenth of a liter, and nanoliter is equal to one-billionth of a liter.

Knowing the conversions between these volume units is essential in science and everyday life, as they are used to measure the volumes of liquids and gases in different contexts.

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The measure of the length of events and the duration of intervals between events is time.

The duration of events or the gaps between them can be measured, compared, or even ordered using time. The lengthy period of time that the Earth's geologic history takes up is known as geologic time. Starting at the beginning of the Archean Eon  formal geologic time runs until the present. Geology is defined as the "Science of the Earth."

Geology is the fundamental Earth science that examines how the earth created, its structure and composition, and the various forces acting on it. It is sometimes known as geoscience or earth science.

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Answer:

c

Explanation:

When the temperature in a room increases from 25°C to 33°C gallium changes from a solid to a liquid

In a lab, methane and nitrogen are cooled from -170°C to -200°C  The methane freezes and the nitrogen condenses

When gold is heated to 2,856°C it changes from a liquid to a gas

Temperature is the degree of hotness or coldness of an object

Here according to the given data

To know if gallium is solid liquids or gas we should know the melting point of gallium when temperature in a room increases from 25°C to 33°C then gallium changes from a solid to a liquid

Here boiling point of nitrogen is  - 195.8 you know that at - 170°C it is a gas and freezing point of nitrogen is - 210°C you know that at - 200°C it is liquid so nitrogen passed from gas to liquids which is described by condensation process that's why in a lab, methane and nitrogen are cooled from -170°C to -200°C the methane freezes and the nitrogen is condenses

Boiling point is the substances that can also be defined as the temperature at which the vapor pressure of the liquid is equal to the prevailing atmospheric pressure and boiling point of gold is 2,856°C and this means that when gold is heated to 2,856 °C further heat added is used to convert the liquid gold to gas so when gold is heated to 2,856°C it changes from a liquid to a gas

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The mass of 3.40 x 10^35 formula units of KCL is 4.20 * 10^13.

The empirical formula of an ionic or covalent network solid compound that is used as a separate entity for stoichiometric calculations is known as a formula unit in chemistry. It is also the ionic compound with the lowest whole number ratio of ions.

As we know,1 mole = 6.02 x 1023 molecules.

1 = (1 mole)/(6.02x1023 molecules)

So, (3.40x10^35 molecules KCL)*(1 mole KCL)/(6.02x1023 molecules KCL)

5.647 *10^11 moles Na2SO4

Molar mass of KCL = 74.55 g/mol

Mass of KCL will be =  5.647 *10^11  * 74.55

Hence, mass of KCL = 4.20 * 10^13

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Answer:

Division by zero is undefined because there is no other number to divide it by.

Explanation:

Unlike 2/2, 2/0 doesn't have anything to divide the 2 by which makes it undefined and impossible to solve.

The division by zero is undefined​, because whatever response we may give, we will then have to concur that the answer times 0 = 1, which is illogical because anything multiplied by zero is zero.

Since any attempt at definition results in a contradiction, the outcome of a division by zero cannot be defined. a=r*b. r*0=a. (1) (1) But because r*0=0 for all r, there is no solution to the equation unless a=0 (1).

Again, mathematicians have left zero divided by zero as an open problem because they are both equally valid and, to be honest, neither of them is consistent with the rest of mathematics.

Mathematically, it is impossible to divide a number by zero, just as in this illustration. Or, at the very least, there isn't currently a means to do that. Numerous attempts have been made to figure out how to divide by zero, as mathematicians are constantly looking for solutions to intriguing mathematical issues.

Thus, The division by zero is undefined​, because whatever response we may give, we will then have to concur that the answer times 0 = 1.

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Answer: There is a very large percentage of C-12.

Explanation:

The atomic mass is must closer to that of C-12 than of C-13, meaning that there is a much larger percentage of C-12.

We can see here that the catalytic cycle for the hydrogenation of alkenes using Wilkinson's catalyst involves several steps.

Here's an overview of the catalytic cycle, including the necessary details:

i. Chemical structure of the catalyst:

Wilkinson's catalyst, also known as chloridotris(triphenylphosphine)rhodium(I), has the following chemical structure: [RhCl(PPh3)3]

ii. Molecular geometry of the catalyst:

The Wilkinson's catalyst has a trigonal bipyramidal geometry around the rhodium center. The three triphenylphosphine (PPh3) ligands occupy equatorial positions, while the chloride (Cl) ligand occupies an axial position.

iii. Type of reactions involved:

The catalytic cycle involves several reactions, including:

iv. Starting material, reagent, and solvent:

The starting material is an alkene, and the reagent is Wilkinson's catalyst ([RhCl(PPh3)3]). The reaction is typically carried out in a suitable solvent, such as dichloromethane (CH2Cl2) or tetrahydrofuran (THF).

v. Major and minor end-products:

The major end-product of the hydrogenation reaction is the fully saturated alkane, resulting from the addition of hydrogen across the double bond. The minor end-product may include cis- or trans-configured alkanes if the original alkene substrate possesses geometric isomers.

vi. Intermediates:

The intermediates in the catalytic cycle include:

These intermediates play a crucial role in facilitating the hydrogenation reaction and enabling the catalytic cycle to proceed.

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true______________________

The empirical formula of the compound is C₂H₁₆S₂N₃O.

The moles of each element is as follows::

For CO₂:

Carbon (C) has a molar mass of 12.01 g/mol.

Oxygen (O) has a molar mass of 16.00 g/mol.

Moles of C in CO₂ = 2.08 g / 12.01 g/mol = 0.173 moles

Moles of O in CO₂ = 2.08 g / 16.00 g/mol = 0.130 moles

For H₂O:

Hydrogen (H) has a molar mass of 1.01 g/mol.

Oxygen (O) has a molar mass of 16.00 g/mol.

Moles of H in H₂O = 1.28 g / 1.01 g/mol = 1.27 moles

Moles of O in H₂O = 1.28 g / 16.00 g/mol = 0.080 moles

For SO₃:

Sulfur (S) has a molar mass of 32.06 g/mol.

Oxygen (O) has a molar mass of 16.00 g/mol.

Moles of S in SO₃ = 4.77 g / 32.06 g/mol = 0.149 moles

Moles of O in SO₃ = 4.77 g / 16.00 g/mol = 0.298 moles

For HNO₃:

Hydrogen (H) has a molar mass of 1.01 g/mol.

Nitrogen (N) has a molar mass of 14.01 g/mol.

Oxygen (O) has a molar mass of 16.00 g/mol.

Moles of H in HNO₃ = 3.48 g / 1.01 g/mol = 3.45 moles

Moles of N in HNO₃ = 3.48 g / 14.01 g/mol = 0.248 moles

Moles of O in HNO₃ = 3.48 g / 16.00 g/mol = 0.217 moles

The simplest whole-number ratio of the elements will be:

Carbon: 0.173 moles / 0.080 moles ≈ 2.16

Hydrogen: 1.27 moles / 0.080 moles ≈ 15.88

Sulfur: 0.149 moles / 0.080 moles ≈ 1.86

Nitrogen: 0.248 moles / 0.080 moles ≈ 3.10

Oxygen: 0.080 moles / 0.080 moles = 1

Therefore, the empirical formula is C₂H₁₆S₂N₃O.

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Answer:

Unsuccessful completion of this stage can result in an inability to trust, and therefore an sense of fear about the inconsistent world. It may result in anxiety, heightened insecurities, and an over feeling of mistrust in the world around them.

Hope this helps!

Answer: Unsuccessful completion of this stage can result in an inability to trust, and therefore an sense of fear about the inconsistent world. It may result in anxiety, heightened insecurities, and an over feeling of mistrust in the world around them.

Explanation:

The information provided tells us that the peptide sequence contains a histidine residue at some position.

This information indicates that the peptide sequence contains a histidine residue, which is covalently modified by FDNB to form 2,4-dinitrophenylhistidine. The fact that the histidine residue is modified by FDNB suggests that it is in the free amino form, rather than being part of an amide or guanidino group.

This is because FDNB reacts with free amino groups, but not with amido or guanidino groups. The presence of a histidine residue in the peptide sequence can provide information about the functional and structural properties of the peptide, as histidine is known to play important roles in protein structure and function.

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The heat made by a mixture of gases is less than that produced by solitary gases of hydrogen or oxygen.

The property becomes a solution of a homogeneous mixture. Some of the effects of gas mixtures are easy to control. if we know the composition of the gases in the mix. In gas mixtures, all components in the gas phase can be used separately. The atmosphere is a mixture of different gases. The part, usually present in solution, first has to be atomized in a flame. Premixed combustion flame, a mixture of fuel and oxidant gas, and diffusion. compared to liquid streams, is relatively simple because the bulk characterization of a single phase is implicit. However, when gas. The heat produced by a mixture of gases is less than that produced by solitary gases. of hydrogen or oxygen.

so we can conclude that the flame appears yellow if there are impurities in the air whereas a pure hydrogen gas flame will not produce any smoke.

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Nuclear Fission

Nuclear fission, subdivision of a heavy atomic nucleus, such as that of uranium or plutonium, into two fragments of roughly equal mass. The process is accompanied by the release of a large amount of energy. In nuclear fission the nucleus of an atom breaks up into two lighter nuclei.

Nuclear fission is a process where the nucleus of an atom is split into two or more smaller nuclei, known as fission products. The fission of heavy elements is an exothermic reaction, and huge amounts of energy are released in the process.

Answer:

double replacement

Explanation:

The density of metal will be "0.469 g/mL".

The given values in the question are:

Now,

The density of metal will be:

→ \(Density = \frac{Mass}{Volume}\)

By substituting the given values, we get

→               \(= \frac{1.5}{3.2}\)

→               \(=0.469 \ g/mL\)

Thus the above is the appropriate answer.

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The density of the metal is 0.47 g/mL

The density of an object is defined as the mass of the object per unit volume of the object.

With the above formula, we can obtain the density of the metal. This is illustrated below:

Volume of metal = change in volume of water = 3.2 mL

Mass of metal = 1.5 g

Density = mass / volume

Density = 1.5 / 3.2

Therefore, the density of the metal is 0.47 g/mL

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Answer:

Explanation:

An element with 70 protons and a mass of 170 would be considered radioactive.

In general, an element with an atomic number (number of protons) greater than 82 tends to be radioactive. Since the element in question has 70 protons, which is less than 82, it does not fall into the category of naturally radioactive elements. However, it is important to note that the stability of an element also depends on the balance between protons and neutrons in the nucleus. Without information about the number of neutrons in the nucleus, we cannot determine the stability of this specific element definitively.

Answer:

7x-2(3-4)-2

Pls help

Explanation:

Answer:

100% sure about that....just believe me

Hope u the best and hope that helps