1.The boiling point of helium is 4 K. When helium boils, what interactions and/or bonds are overcome?
2. The boiling point of hydrogen is 20 K. When hydrogen boils, what interactions and/or bonds are overcome?
3. What interactions and/or bonds are overcome when hydrogen at 30 K is heated to 6000 K?

Answer:

\(2Mg^0 + O_2^0\rightarrow2Mg^{2+}O^{2-}\)

Explanation:

Hello there!

In this case, according to the rules for the oxidation states in chemical reactions, it is possible to realize that lone elements have 0 and since magnesium is in group 2A, it forms the cation Mg⁺² as it loses electrons and oxygen is in group 6A so it forms the anion O⁻²; therefore resulting oxidation numbers are:

\(2Mg^0 + O_2^0\rightarrow2Mg^{2+}O^{2-}\)

Best regards!

The acyl substituent effect in an electrophilic aromatic substitution reaction is deactivating and meta-directing. Therefore, the correct option is (D) deactivating and meta-directing.

An electrophilic aromatic substitution (EAS) reaction is a type of organic reaction that involves the substitution of an aromatic hydrogen atom with an electrophile.

The electrophile attacks the aromatic ring, forming a positively charged intermediate, which is then stabilized by a nearby electron-donating group (if present) or a neighboring double bond. This type of reaction is commonly used in the synthesis of a variety of organic compounds, including pharmaceuticals, dyes, and polymers

To know more about  aromatic substitution here

https://brainly.com/question/14803468

#SPJ4

Answer:

Friction, Ability to work and Inertia all increase.

Answer:

Explanation:

When a flask is dipped in very hot water in a large beaker , the flask expands due to heat gain . As a result , level of water in tube fitted in flask goes down .

After some time , the water inside tube also become hot so it expands  . coefficient of volume expansion of water is more than coefficient of volume expansion of glass . Hence greater expansion takes place in the volume of water . It is due to this fact that water level in tube starts rising after some time of fall .

volume of carbon dioxide is produced in the first minute 0.56 L of CO₂

Salt, carbon dioxide, and water are produced when metal carbonate and an acid react. In order to create calcium chloride (CaCl2), carbon dioxide (CO2), and water, calcium carbonate (CaCO3) combines with hydrochloric acid (HCl) (H2O). We are aware that 22.4 L is the volume occupied by 1 mole of any gas at 0° C and 1 atm pressure.

Thus, 100 g of CaCO₃ produces 22.4 L of CO₂

So, 2.5 g CaCO₃ will form, which equals 100.

56 L of CO (2.5*22.4/100)

= 0.56 L of CO₂

Learn more about carbon dioxide here-

https://brainly.com/question/3049557

#SPJ9

​

Answer:

I'm pretty sure its D

Explanation:

they have uncontrolled growth

The two liquids being measured when obtaining an absorbance spectrum are called the absorbance (A) and the transmittance (T) solutions.

Absorbance is measured using a spectrophotometer or microplate reader, that's an device that shines light of a special wavelength via a sample and measures the quantity of mild that the pattern absorbs.

Absorption spectra (additionally called UV-Vis spectra, absorbance spectra and electronic spectra) display the change in absorbance of a sample as a characteristic of the wavelength of incident light, and are measured the usage of a spectrophotometer.

Definition of absorption spectrum: an electromagnetic spectrum wherein a decrease in depth of radiation at precise wavelengths or ranges of wavelengths characteristic of an soaking up substance is manifested specially as a sample of darkish lines or bands.

Learn more about absorbance spectrum here: https://brainly.com/question/10252035

#SPJ4

If the solvent level in the developing jar is deeper than the origin (spotting line) of the TLC plate, the solvent will dissolve the compounds into the solvent reservoir instead of allowing them to move up the plate by capillary action. Thus, you will not see spots after the plate is developed.

What is Thin Layer Chromatography (TLC)?

To learn more about TLC: https://brainly.com/question/13483325

#SPJ4

Explanation:

................easy ngl

Answer:

for protons going down it is:

(already given)

6

6

8

8

17

17

for neutrons going down it is:

6

7

8

(already given)

10

18

20

for electrons going down it is:

6

6

8

8

(already given)

17

Explanation:

bascially the number of protons is the bottom number to the left and the number of electrons is the same as the number of protons and the number of neutrons is basically the mass number (the top right one) minus the proton number

hope this helps:)

The new pressure, when the temperature is increased from 20°C to 35°C with constant volume and an original pressure of 1.2 atm, is approximately 1.263 atm.

If the temperature of a gas is increased from 20°C to 35°C, and the volume is kept constant, the new pressure can be calculated using the ideal gas law.
Assuming an original pressure of 1.2 atm, the new pressure can be determined.

To find the new pressure, we can use the ideal gas law equation: PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.

First, we need to convert the temperatures to Kelvin.
The original temperature of 20°C is equal to 293 K, and the new temperature of 35°C is equal to 308 K.

Since the volume is constant, we can write the equation as P1/T1 = P2/T2, where P1 is the original pressure, T1 is the original temperature in Kelvin, P2 is the new pressure, and T2 is the new temperature in Kelvin.

Substituting the given values, we have:

(1.2 atm) / (293 K) = P2 / (308 K)

Solving for P2, the new pressure:

P2 = (1.2 atm) * (308 K) / (293 K) ≈ 1.263 atm

Therefore, the new pressure, when the temperature is increased from 20°C to 35°C with constant volume and an original pressure of 1.2 atm, is approximately 1.263 atm.

Learn more about Pressure from the given link:

https://brainly.com/question/28012687

#SPJ11

Answer: 22400

Explanation:

The average atomic mass in amu of x IS 65.48 amu

(64x.49)+(66x.28)+(68x.23)

The aim of this question is to compute the average atomic mass of an unknown element. Now, the three isotopes of an unknown element are x, 64, x, 66, and x 68. Let us calculate the percentage abundance of each isotope in terms of x, which is 64. Isotope is 49 percent and x, 66 percent and x, 68 percent the atomic mass of z, 64 percent is 3.929, and the atomic mass unit of zinc is 66 points. Zinc is an undiscovered element with five isotopes zinc, 64, x, 66, and 68.

Are the most abundant isotopes, so the atomic mass unit of 64 isotopes is 63.929, an atomic mass unit of 66 isotopes is 65.926 and the atomic mass unit of 68 isotopes is 67.924 formula to calculate the average atomic mass percentage abundance of each isotope, that is 49 divided by 100 multiplied with its isotopic abundance It is done for all three isotopes by mass.

(64x.49)+(66x.28)+(68x.23)

An average atomic mass is determined as 65.40701. AMU.

Learn more about average atomic mass here: https://brainly.com/question/2378539

#SPJ4

Answer:

1,3,2

Explanation:

N2 + 3H2-----> 2NH3

The percent composition of Ca in the compound is 42.06%.

The percent composition of Ca in the compound can be calculated using the formula:

% Ca = (mass of Ca/mass of compound) x 100

Given that 17.6 grams of Ca combine completely with 24.2 grams of S to form a compound, we can calculate the mass of the compound as:

mass of compound = mass of Ca + mass of S = 17.6 + 24.2 = 41.8 g

Substituting these values in the formula above, we get:

% Ca = (17.6 / 41.8) x 100 = 42.06%

Therefore, the percent composition of Ca in the compound is 42.06%.

To know more about Percent Composition,

brainly.com/question/11952337

Americium-241 is a radioactive element commonly used in smoke detectors. The radiation it emits ionizes particles in the air, which are then detected by a charged-particle collector, triggering the alarm. The half-life of Americium-241 is 432 years, meaning that after that time, half of the original sample will have decayed. It decays by emitting alpha particles, which are made up of two protons and two neutrons. To determine how many particles are emitted each second by a -gram sample of Americium-241, we need to use the decay constant and Avogadro's number. The result is approximately 2.4 x 10^16 alpha particles per second. Despite being a radioactive element, Americium-241 is used safely in small amounts in smoke detectors for the benefit of public safety.
Hi! Americium-241 (Am-241) is a radioactive element commonly used in smoke detectors due to its ability to emit alpha radiation. The radiation released by Am-241 ionizes air particles, which are then detected by a charged-particle collector within the smoke detector. The half-life of Am-241 is 432.2 years.

To determine the number of particles emitted each second by a specific sample of Am-241, we need to know the mass (in grams) of the sample. Unfortunately, your question did not provide this information. Please provide the mass of the Am-241 sample, and I will be happy to help you calculate the number of particles emitted each second.

To know more about Americium-241 visit

https://brainly.com/question/18559372

#SPJ11

Answer:   A process of cooking food in a pot made from unglazed and natural clay. coddling: Heating food in water kept just below the boiling point.

Explanation:

Answer:

what do you mean?

Explanation:

The molecule shape of SF6 is octahedral.

SF6 is a sulfur hexafluoride molecule, which is composed of a central sulfur atom surrounded by six fluorine atoms. In the SF6 molecule, the sulfur atom is bonded to the six fluorine atoms through strong covalent bonds.

The arrangement of these bonds gives SF6 an octahedral shape, with the six fluorine atoms positioned at the vertices of an imaginary octahedron and the sulfur atom at its center. The octahedral shape of SF6 is due to the symmetrical distribution of electron density around the central sulfur atom, which results in a sp3d2 hybridization state.

In summary, SF6 has an octahedral molecule shape, which is characterized by six equidistant vertices arranged symmetrically around a central atom.

Learn more about hybridization state here:

https://brainly.com/question/30323439

#SPJ4

The first step to answer this question is to assume that the given percents are masses.

Then, convert these masses to moles using the corresponding molar mass:

Divide each result by the least result (1.26mol):

Since not all of these are whole numbers, we have to multiply them times 2:

These numbers are the subscripts of each element in the empirical formula.

It means that the empirical formula of this compound is:

The limiting reagent is 129.8 g of methane which will react completely with 259 g of oxygen, and 159 g of methane is in excess.

To determine the mass of water required to react completely with 1.70 mol of acetylene, we need to first write and balance the chemical equation:

CHCH + 2H2O ⟶ HOCH2CH2OH

From the equation, we can see that 1 mole of acetylene reacts with 2 moles of water. Therefore, 1.70 mol of acetylene would require:

2 mol H2O/mol CHCH × 1.70 mol CHCH = 3.40 mol H2O

To convert mol of water to grams, we need to use the molar mass of water, which is approximately 18.015 g/mol:

3.40 mol H2O × 18.015 g/mol = 61.27 g of water

Therefore, 61.27 g of water would be required to react completely with 1.70 mol of acetylene.

To determine the limiting reagent, we need to first write and balance the chemical equation for the combustion of methane:

CH4 + 2O2 ⟶ CO2 + 2H2O

From the equation, we can see that 1 mole of methane reacts with 2 moles of oxygen. Therefore, we can calculate the moles of methane and oxygen present:

Moles of CH4 = 159 g / (12.01 g/mol + 4(1.01 g/mol)) = 159 g / 16.05 g/mol = 9.91 mol

Moles of O2 = 259 g / 32.00 g/mol = 8.09 mol

To determine the limiting reagent, we need to compare the moles of each reactant present to the stoichiometric ratio in the balanced equation. The reactant that is present in excess will not be completely consumed and therefore, the other reactant will be the limiting reagent.

For methane, the stoichiometric ratio with oxygen is 1:2, which means that 1 mole of methane requires 2 moles of oxygen. Therefore, the maximum number of moles of oxygen that can be consumed is:

2 mol O2/mol CH4 × 9.91 mol CH4 = 19.82 mol O2

Since we only have 8.09 mol of oxygen available, oxygen is the limiting reagent. Therefore, methane is present in excess and some of it will remain unreacted. The amount of methane that will react with the available oxygen can be calculated as:

1 mol CH4/1 mol O2 × 8.09 mol O2 = 8.09 mol CH4

To convert the moles of methane to grams, we can use the molar mass of methane, which is approximately 16.04 g/mol:

8.09 mol CH4 × 16.04 g/mol = 129.8 g CH4

Know more about molar mass here: https://brainly.com/question/22997914

#SPJ4

Answer: Meteorhpayne

Explanation: Correct me if im wrong :(

Prior to the industrial revolution, the previous highest level of CO2 concentration in the atmosphere over the prior 400,000 years was 300 ppm.

Before the Industrial revolution, the carbon dioxide concentration in the atmosphere was lesser as there was not much carbon dioxide waste that was produced. The highest level of carbon dioxide recorded in the air was 300 ppm at that time.

After the industrial revolution, the concentration of carbon dioxide increased. We can see the carbon dioxide concentrations to reach as high as 1.5 trillion tons today. This is because the formation of industries has been increasing since then which produces a lot of waste carbon dioxide.

To learn more about industrial revolution, click here:

https://brainly.com/question/13323062

#SPJ4

The correct option is dissolving ammonium nitrate in water to cool the water.

Among the given options, the example of an exothermic reaction is dissolving ammonium nitrate in water to cool the water.

Exothermic reactions are chemical reactions that release heat energy into the surroundings. As a result, the products have less energy than the reactants. Dissolving ammonium nitrate in water to cool the water is a good example of an exothermic reaction because it releases heat energy and cools down the surrounding water.

When ammonium nitrate dissolves in water, it releases heat, causing the temperature of the water to decrease. The reaction is exothermic because it releases heat to the surroundings. Dissolving sugar in water and melting ice are examples of endothermic reactions because they absorb heat energy from the surroundings.

Therefore, the correct answer is the option of dissolving ammonium nitrate in water to cool the water.

To learn more about exothermic reactions refer - https://brainly.com/question/10373907

#SPJ11

Answer:

Cl2

Explanation:

Bcs in product there is chorine

The gas in question must be neon.

The spectrum can be used to identify a gas. The idea of a spectrum is adapted from the Bohr model of the atom. It stems from the change in the energy level of an electron in the atom.

The gases that could be used in a bulb are; hydrogen, Helium, Neon, Argon, Krypton, Xenon. If we look at the attached chart that shows the maximum wavelength of each gas, we will notice that that of neon is fairly constant and it has the highest number of lines in the spectrum.

Based on the strength of the all the evidences as shown above, the gas in question must be neon.

Learn more about spectrum of  gas:https://brainly.com/question/11837978

#SPJ1

Missing parts;

I NEED HELP ASAP! Compare the spectrum of the unknown gas collected at the bulb company

with the data in your table. Which gas is leaking into the lab? Make a claim

and support your claim with evidence.

The leaking gas is: ___________________________________________

Evidence:

The elements have similar properties to beryllium are magnesium and aluminium.

The term an element is defined as a pure substance that cannot be broken down by any physical or chemical means into simpler substances.

An element is made up of the same kind of atoms. Elements are classified into metals, nonmetals, and metalloids.

Atoms are made up of protons, neutrons, and electrons. Two unusual kinds of atoms can mix to produce a compound.

Magnesium, calcium, strontium, barium, radon are all chemically same to beryllium. Elements in the similar group have the same chemical properties because they have the equal number of valence electrons.

Thus, The two elements with properties most like beryllium are magnesium and aluminium.

To learn more about an element, follow the link;

https://brainly.com/question/13025901

#SPJ5

Explanation:

Plugging into the following equations will give you the answer (the answer is the attached image):

\(pH+pOH=14\)

\(pH=-log_{10}([H^+])\)

\(pOH=-log_{10}([OH^-])\)

\([H^+][OH^-]=10^{-14}\)

\([H^+]=10^{-pH}\)

\([OH^-]=10^{-pOH}\)

Answer:

C

Explanation:

The percent composition of an atom in a molecule gives information regarding the relative amount of mass an atom contributes to a molecule.

Because there are 6 carbon molecules in 2-octene, we will place down 6 carbons. Carbons usually form a backbone, so they will be lay in a flat line. You can then add 3 H on both the Hydrogens at the ending to create symmetry, and keep filling Hydrogen on both sides and try to creat symmetry until you only have 2 H left. Place 1 H above a C and 1 H below a C so the remaining 2 carbons can then double bond to each other and form a complete octet.