how did th building blocks of life first form? at the end of 2 weeks 15 of the carbon was in the form of organic compounds such as

Answer:

You can find p-block elements on the periodic table in groups 13 to 18, you can find the s-block on the periodic table in group 1, Group 3 through Group 12 are d-block elements, and The f-block elements, found in the two rows at the bottom of the periodic table, are called inner transition metals and have valence electrons in the f-orbital's.

Explanation:

Hope this helps!

Answer:

I don't know the correct answer

Answer:

the liver

Explanation:

it processes alcohol, work very hard

The concentration of nitric acid in moles per litre in a sample with a density of 1.412 g l-1 and a mass percent of HNO3 of 69 % is 0.01547 mol l-1.

The concentration of nitric acid (HNO3) in moles per litre in a sample with a density of 1.412 g l-1 and a mass percent of HNO3 of 69 % can be calculated as follows:
1. Convert the mass percent of HNO3 to grams per litre by multiplying 69 % by 1.412 g l-1. This gives us 0.972 g l-1.
2. Determine the molecular weight of nitric acid (HNO3). This is 63.01 g/mol.
3. Divide the amount of nitric acid in grams (0.972 g l-1) by the molecular weight of HNO3 (63.01 g/mol). This gives us 0.01547 mol l-1.
Therefore, The concentration of nitric acid in moles per litre in a sample with a density of 1.412 g l-1 and a mass percent of HNO3 of 69 % is 0.01547 mol l-1.

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Answer:

0.351 gms

Explanation:

How many grams of NaCl are found in 67.0 mL of a 0.10 M solution?

in 1000 ml there are 0.10 molesi

in 100 ml, there are 0.01 moles

in 67 ml, there are(67/100) X 0.010 moles = 0.0067 mole

1 mole of NaC weighs 23+35.5=58.5 gms

0.0067 moles weighs 58.5 X  = 0.351 gms

The new molarity of the solution is 0.5M.

The molarity of a solution can be calculated by using the following expression:

C1V1 = C2V2

Where;

According to this question, a chemist dilutes 2.0 L of a 1.5 M solution with water until the final volume is 6.0 L.

1.5 × 2 = 6 × C2

3 = 6C2

C2 = 3/6 = 0.5M

Therefore, the new molarity of the solution is 0.5M.

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Given: Initial volume = 125 mL Initial concentration = 8.00 M Final volume = to be found Mass of CuCl2 = 4.21 g

The number of moles of CuCl2 can be calculated as n = m/M where m is the mass of the solute and M is the molar mass of the solute. Now, the molar mass of CuCl2 = 63.546 + 2 × 35.453 = 134.45 g/mol

n = 4.21/134.45 = 0.03134 mol n 52.0 mL of the diluted solution, we have 0.03134 mol of CuCl2.Using the formula, C1V1 = C2V2C1 = 8.00 M (as it is given in the initial solution)V1 = 125 MLC2 = n/V2 (since several moles and volume are given in the diluted solution)n = 0.03134 molV2 = 52.0/1000 = 0.052 L (since the volume is to be expressed in liters)V1 = C2V2/C1= (0.03134/0.052)/8.00= 0.075 L = 75 mL (approximately)Therefore, the volume to which the initial 125 mL solution of 8.00 M CuCl2 must be diluted to obtain 52.0 mL of a solution containing 4.21 g CuCl2 is approximately 75 mL.

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All of the following are effective for destroying prions, EXCEPT proteases.

Explanation :

Prions are abnormal proteins that are found in the brain and cause brain diseases.

They can be transmitted through contaminated surgical instruments, meat products, and blood products.

Prions are not destroyed by standard sterilization techniques such as boiling or exposure to radiation.

Prions are a very hardy kind of protein. They are contagious even after being frozen for lengthy periods of time, which does not kill them. In order to eradicate a prion, it must first be denaturated to the point that it can no longer induce the abnormal folding of normal proteins. A prion may be successfully inactivated by subjecting it to heat that is maintained for many hours at temperatures that are exceedingly high (at least 900 degrees Fahrenheit).

The effective methods to destroy prions include incineration, NaOH treatment combined with autoclaving at 134°C, and chemical decontamination using sodium hydroxide, sodium hypochlorite, and hydrogen peroxide.

Proper sterilization and disinfection protocols are essential to prevent the transmission of prion diseases.

Surfaces and instruments should be decontaminated with effective chemicals that are capable of inactivating prions.

In addition, prion-infected materials should be treated appropriately to prevent the spread of disease.

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The statement "in general, the solubility of solids in water decreases with increasing temperature" is false. Typically, the solubility of solids in water increases as the temperature increases.

This is because an increase in temperature supplies additional energy to the system, which helps break the intermolecular forces holding the solid particles together, allowing them to dissolve more easily in water.

As the temperature of water increases, the kinetic energy of its molecules also increases. This allows for better interaction between the solid particles and water molecules, resulting in a higher rate of dissolution. Consequently, the solubility of most solid solutes in water usually increases with increasing temperature.

However, it is important to note that this trend does not hold true for all substances. In some cases, the solubility of certain solids may decrease with increasing temperature due to unique chemical properties or interactions with water. Additionally, the solubility of gases in water typically decreases as temperature increases, which is a different behavior than that of solids.

In summary, the statement in question is false, as the solubility of most solids in water generally increases with increasing temperature, allowing for greater dissolution of the solid particles in the liquid.

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Lead cannot melt at such level, hence it cannot break down into individual atoms or molecules. A change in the bonding of atoms or molecules is referred to as melting.

The metallic connections are broken and the atoms are made more mobile by the energy needed to melt the metal. Atoms have the same kinetic energy as they did as a solid at a particular temperature, such as the melting point.

No, an atom cannot be melted. The three common states of matter no longer hold true when you are dealing with so tiny a piece. Atoms do not alter until by nuclear fission or fusion.

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The first step in this calculation is to know how many liters is equal to 1 gallon, and the value is 3.785 liters, so now we have to make the following calculation:

1 gal = 3.785 Liters

30.0 gal = x Liters

x = 3.785 * 30.0

x = 114 Liters

It does matter which compound is added first when preparing the aldol reaction between acetone and benzaldehyde in an aqueous NaOH solution. The order in which the components are added can indeed influence the reaction, as it affects the formation of the reaction intermediate.

1. If you add the acetone to the aqueous NaOH solution first, the nucleophilic attack of the NaOH on the carbonyl group of the acetone will occur, forming an alkoxide intermediate (enolate ion).

2. Next, when you add benzaldehyde, the alkoxide intermediate will act as a nucleophile and attack the carbonyl group of the benzaldehyde, leading to the desired product i.e., benzalacetone.

Alternatively, if you add the benzaldehyde to the aqueous NaOH solution first:

1. The benzaldehyde will react with NaOH to form a carboxylate ion intermediate.

2. When you add the acetone, the carboxylate ion intermediate will react with the acetone, but this reaction is less favorable due to the resonance stabilization of the carboxylate ion.

So, in conclusion, it does matter which component is added first. Adding the acetone to the aqueous NaOH solution before benzaldehyde results in a more favorable reaction, as the alkoxide intermediate (enolate ion) is more reactive and more likely to produce the desired product i.e., benzalacetone.

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Answer:

scientific community's consensus on the human causes of global climate change

Explanation:

The mass of gold that is produced when 21.1 a of current are passed through a gold solution for 37.0 min is 31.87 g

Using the formula

m = atomic mass  × It /nF

Where m is the mass

n is the number of equivalents

F is the Faraday constant ( F = 96485 C)

I is the current

and t is the time

From the given information

I = 21.1 A

t = 37.0 min = 37.0 × 60

t = 2220 secs

For gold

Atomic mass = 196.97 g/mol

and n = 3

Putting these parameters into the formula, we get

m = 196.97 gmol⁻¹ × 21.1 A × 2220 sec / 3 × 96485

m= 9226468.74/ 289455

m= 31.87 g

Hence, the mass of gold that is produced is 31,87 g

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DiHydrogen Phosphate or Phosphoric acid is the compound here

How to identify and name

First identify the two ions

Now

Name them

Combine and you are done

We will use the given compound{DiHydrogen Phosphate)

We know the naming rule

Find anion here

2 hydrogen ions

Combine them

Answer:

protons and neutrons

Explanation:

Neutrons and protons are the particles that are found in the nucleus of an atom.

Protons and neutrons are subatomic particles. They are present in the nucleus of an atom and constitute most of the mass of the atom. There are three kinds of subatomic particles that are present in an atom.

These are -

Since most of the mass of the atom, in the form of protons and neutrons, is present in the nucleus, the mass number is denoted as the sum of the number of protons and neutrons. Protons and neutrons together are sometimes also called nucleons.

Therefore, neutrons and protons are present in the nucleus of an atom.

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Answer:wont

Explanation:

Out of the given options, the greatest pressure would be represented by option D) 62106 Pa.

In order to compare the pressures given in different units, we can convert them to a common unit.

Here, we can convert them to the SI unit of pressure which is pascal (Pa).1 atm = 101325 Pa (approximately)1 mmHg = 133.322 Pa (approximately)1 psi = 6894.76 Pa (approximately)

So, we have:0.680 atm = 0.680 × 101325 Pa ≈ 69057.6 Pa517 mm Hg = 517 × 133.322 Pa ≈ 68910.2 Pa11.4 psi = 11.4 × 6894.76 Pa ≈ 78767.5 Pa62106 Pa = 62106 Pa14.1 = unclear (there is no unit provided)

Therefore, Out of these, the greatest pressure is represented by option D) 62106 Pa as it is already in pascals.

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For the pairs of covalently bonded atoms:

(A) C-N and (B) C≡N:

The bond length is expected to be shorter in C≡N (B) because it represents a triple bond. Triple bonds are shorter than single bonds due to increased electron density between the atoms.

(C) N-N and (D) N≡N:

The bond length is expected to be shorter in N≡N (D) because it represents a triple bond. Again, triple bonds are shorter than single bonds due to increased electron density.

In terms of bond energy:

(A) C=C and (B) C-C:

The bond energy is expected to be higher in C=C (A) because it represents a double bond. Double bonds have higher bond energy than single bonds due to the increased strength of the shared electrons.

(C) C=N and (D) C≡N:

The bond energy is expected to be higher in C≡N (D) because it represents a triple bond. Triple bonds have higher bond energy than double bonds due to the increased strength of the shared electrons.

(A) C≡C and (B) C=C:

The bond energy is expected to be higher in C≡C (A) because it represents a triple bond. Triple bonds have higher bond energy than double bonds due to the increased strength of the shared electrons.

(C) C≡O and (D) C=O:

The bond energy is expected to be higher in C≡O (C) because it represents a triple bond. Triple bonds have higher bond energy than double bonds due to the increased strength of the shared electrons.

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A hydrate of cobalt(II) chloride had a mass of 238.0 g before heating. After heating, the anhydrous CoC1, weighed 130.7 g.

from above statement, we found that,

before heating cobalt(II) chloride  = 238.0g

Mass of hydrated  cobalt(II) chloride After heating = 130.7 g

Mass of water = (1238.0 - 130.7) g = 107.39g

moles H2O  = 107.39× 1 mole H2O÷18g H2O

= 5.96 mol H2O.

moles of anhydrous CoCl, remain = given mass of CoCl÷ molar mass of CoCl

=130÷94.5

= 1.375 mole

moles of CoCl₂ = given mass of  CoCl₂÷ molar mass of CoCl₂

= 130÷ 130

= 1 mole.

hydration number = moles of water÷ mole of compound

= 5.96 mol÷ 1

 = 5.96 hydration number

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The statement about thermal energy and temperature that is correct is option d: Water in the Pacific Ocean has more thermal energy and a lower temperature.

Thermal energy is the total kinetic energy of the particles in a substance, and it depends on the mass, temperature, and specific heat capacity of the substance. The Pacific Ocean contains an enormous amount of water, so it has a much greater thermal energy than a cup of hot coffee.

However, the temperature of the coffee is much higher than the temperature of the ocean water because coffee is typically served at temperatures around 60-80°C (140-176°F), while the temperature of the ocean's surface water is typically around 15-25°C (59-77°F).

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See full question below

Compare a cup of hot coffee with the Pacific Ocean. Which statement about thermal energy and temperature is correct?

Water in the Pacific Ocean has more thermal energy and a higher temperature.

Water in the Pacific Ocean has less thermal energy and a lower temperature.

Water in the Pacific Ocean has less thermal energy and a higher temperature

Water in the Pacific Ocean has more thermal energy and a lower temperature.

We can calculate the pH using the relatiοnship pH + pOH = 14.

The chemical symbοl fοr hydrοgen is OH, making it a diatοmic aniοn. It cοntains a negative electric charge and is made up οf an οxygen and a hydrοgen atοm jοined by a single cοvalent link. It is a significant but typically insignificant part οf water.

Tο calculate the pH οf a saturated sοlutiοn οf each cοmpοund, we need tο determine the cοncentratiοn οf hydrοxide iοns (OH-) in the sοlutiοn using the given sοlubility prοduct cοnstant (Ksp) values. The hydrοxide cοncentratiοn will then be used tο calculate the pOH, and finally, the pH can be calculated using the relatiοnship pH + pOH = 14.

a. Pb(OH)² (Ksp = 1.2 × \(10^{-15\))

Since Pb(OH)² dissοciates as fοllοws:

Pb(OH)² ⇌ Pb²+ + 2OH-

The cοncentratiοn οf OH- can be fοund using the Ksp expressiοn:

Ksp = [Pb²+][OH-]²

At equilibrium, since Pb(OH)² is a strοng electrοlyte and fully dissοciates, the cοncentratiοn οf Pb²+ is equal tο the sοlubility οf Pb(OH)². Let's represent the sοlubility οf Pb(OH)² as "s". Therefοre, [Pb²+] = s.

Plugging these values intο the Ksp expressiοn:

Ksp = s * (2s)² = 4s³

We can sοlve fοr "s" by rearranging the equatiοn and taking the cubic rοοt:

s =\((Ksp / 4)^{(1/3)\)

Nοw, we have the cοncentratiοn οf OH- in terms οf "s". Tο find the pOH, we use the equatiοn:

pOH = -lοg[OH-]

Finally, we can calculate the pH using the relatiοnship pH + pOH = 14.

b. Ni(OH)² (Ksp = 1.6 × \(10^{-16\))

Fοllοwing a similar apprοach as in part a, we can determine the cοncentratiοn οf OH- and calculate the pH.

c. Fe(OH)² (Ksp = 1.8 × \(10^{-15\))

Again, we use the same methοd tο find the cοncentratiοn οf OH- and calculate the pH.

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The situation with blue light waves is more likely to produce the photoelectric effect because the higher energy of the blue photons enables them to eject electrons from the metal more easily.

The photoelectric effect is the phenomenon where electrons are ejected from a material when it is exposed to light. The likelihood of the photoelectric effect occurring depends on the energy of the incident photons, which is determined by the frequency (or color) of the light.

Blue light waves have a higher frequency than red light waves. According to the equation E = hf, where E is the energy of a photon, h is Planck's constant, and f is the frequency of the light, it can be concluded that higher-frequency light waves have more energy per photon.

The situation that is most likely to produce the photoelectric effect is when blue light waves are used. The higher energy of blue light photons means that they have sufficient energy to overcome the binding energy of electrons in the metal, resulting in the ejection of electrons. Red light waves, on the other hand, have lower energy per photon, and thus, they are less likely to cause the photoelectric effect.

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Answer:

I would say C

Explanation: Hope this helped

Therefore, the work done during the vaporization of 1 mole of the liquid is -28.7 atm·L/mol, and the change in internal energy is approximately 27.2 kJ/mol.

The work done during the vaporization of the liquid is given by:

w = -PΔV

At constant pressure, the change in volume during vaporization is equal to the molar volume of the gas at 80°C and 1 atm, which can be calculated using the ideal gas law:

V = nRT/P = (1 mol)(0.0821 L·atm/mol·K)(353 K)/(1 atm)

≈ 28.7 L/mol

Therefore, ΔV = V_gas - V_liquid

= 28.7 L/mol - 0

= 28.7 L/mol.

Substituting into the equation for work, we get:

w = -(1.00 atm)(28.7 L/mol)

= -28.7 atm·L/mol

The change in internal energy during the vaporization of the liquid is given by:

ΔE = q + w

At constant pressure, the heat absorbed during vaporization is equal to the enthalpy change of vaporization:

q = ΔH_vap

= 30.7 kJ/mol

Substituting the values for q and w, we get:

ΔE = 30.7 kJ/mol + (-28.7 atm·L/mol)

Converting atm·L to joules using the conversion factor 1 L·atm = 101.3 J, we get:

ΔE = 30.7 kJ/mol - (28.7 atm·L/mol)(101.3 J/L·atm)

≈ 27.2 kJ/mol

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Answer:

They hide their evidence and destroy any if absolutely necessary. You also would need to wear gloves, so you dont put your identity everywhere. Also, you need to flee and just forget that what you did, did not happen. And hope you dont get arrested xD

Explanation:

Answer:

10.71 g/mL

Explanation:

Initial Volume = 17.5 mL

Final Volume = 20.3 mL

Volume of cube = Final Volume - Initial Volume = 20.3 mL - 17.5 mL = 2.8mL

Mass of cube = 30g

Density = Mass / Volume

Density = 30 / 2.8 = 10.71 g/mL

Answer:

The molar mass of the gas should be 43.0 g/mol.

Explanation:

1.Use the ideal gas law(\(PV=nRT\)) & the formula for moles and molar mass(\(n=m/M\)).

2.Insert the equation \(n=m/M\) into \(PV=nRT\) and re-arrange to solve for M(molar mass). \(M = mRT/PV\)

3.Insert values and use the gas constant R = \(0.082 (L * atm)/(K * mol)\) since the volume is in liters and the pressure is in atmosphere units.

\(M = mRT/PV = \frac{(1.98g)(0.082 L*atm/(K*mol))(305 K)}{(0.960 atm)(1.20 L)}\)

4. Your answer should be 42.99 g/mol or 43.0 g/mol.

Have fun with chemistry!

Answer:

Explanation:

The new volume can be found by using the formula for Boyle's law which is

\(P_1V_1 = P_2V_2\)

Since we are finding the new volume

\(V_2 = \frac{P_1V_1}{P_2} \\\)

From the question we have

\(V_2 = \frac{145.7 \times 1.08}{1.35} = \frac{157.356}{1.35} \\ \)

We have the final answer as

Hope this helps you

Following are the three guidelines to follow when considering to dispose of a material in the drain:

The material should be non hazardous, no radioactive waste and no hazardous chemical waste.

No liquid, solids, sludges, or viscous substances should be disposed in the drain

The material should not interfere with sewage treatment operations. It should not have corrosive pH levels. We should also avoid grease or oil.

It is not necessary that all the waste generated in the laboratory are hazardous. Some chemicals are safe to go in the trash or can be disposed down the sink. There are certain criteria that must be followed in order for materials to be put down the drain including low toxicity, high water solubility, and moderate PH. Only small quantities are allowed in the system at any given time and the chemicals must be degradable by the wastewater treatment.

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