SOMEONE HELP ME PLS!!!!

Answer:

Ghawar field   location-Saudi Arabia

Burgan Field   location-Kuwait

Ahvaz field      location-Iran

Upper Zakum Oil Field   Location-Abu Dhabi UAE

Explanation:

I learned this yesterday :D

Answer:

volume= 1.77dL

first you'll find the moles using

Moles= Mass/Molar mass

After that you'll find the volume using

Molarity= Moles/Volume

Answer:

Al2O3

Explanation:

Al2O3 has an ionic bond because the bonds between them are very strong

*sorry I can't give a full explanation.*

g = 9.8 m/s²

w = m*g

Weight of cat: 55 N = m*9.8

m = 5.61 kg

Weight of dog: 110 N = m*9.8

m = 11.22 kg

There is gravitational potential energy (GPE) acting on the cat since it's at the very top.

GPE of cat = m*g*h = 5.61*9.8*2 = 109.96 J

GPE of dog = m*g*h = 11.22*9.8*0 = 0 J (it's 0 m height because it's on the floor instead of in the tree)

But, if the dog was also 2 m up in the tree, its GPE would be 219.91 J.

As you can see, it's GRAVITATIONAL potential energy is bigger than the cat because it weighs more. Generally, if you were just trying to find the force which is w = m*g (since weight is a force), you would see that the bigger the mass, the bigger the force, and gravity stays the same.

Hope this helped

First, we define density as:

Density = mass/volume;

We focus first on the volume of air in the room.

Volume:

We have the measurements of where the air is.

We calculate the volume with these measurements, but first, we change the units to L:

1 inch = 2.54 cm

1 L = 10^3 cm^3

1 ft = 12 inch

Now,

11.0 ft x (12 in/1 ft) x (2.54 cm/1 in) = 335.28 cm

12.0 ft = 365.76 cm

10.0 ft = 304.8 cm

Therefore, the volume of the room = 335.28 cm x 365.76 cm x 304.8 cm

Volume = 37378237.5 cm^3 x (1 L/10^3cm^3) = 374 x 10^2 L

From the Density equation, we clear the mass:

Density x volume = mass (g)

1.19 g/L x 374x10^2 L = 445x10^2 g x (1 kg/1000 g) = 44.5 kg

Answer: 44.5 kg

Isopentane, commonly known as methyl butane or 2-methylbutane, is an alkane with a branched chain and five carbon atoms. Its chemical formula is C 5H 12 or CH(CH).

At normal temperature and pressure, isopentane is a highly flammable and volatile liquid. Additionally, under normal circumstances, it is the least dense liquid. [Reference needed] Isopentane has a standard boiling point that is only a few degrees above room temperature, therefore on a warm day, it will easily boil and evaporate. To achieve a liquid bath temperature of 160 °C, isopentane and liquid nitrogen are frequently utilized. Isopentane is a substantial component of natural gasoline, however, it normally only makes up 1% or less of natural gas.

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One mole of an ideal monatomic gas initially at 300 K and a pressure of 15 atm expands to a final pressure of 1 atm. The expansion can occur via any one of four different paths: 1. isothermal and reversible, 2. isothermal and irreversible, 3. adiabatic reversible, and 4. adiabatic irreversible.

In irreversible processes, the expansion occurs against an external pressure of 1 atm. For each case, we can calculate the values of q, w, ΔU, and ΔH using the following equations:

1. Isothermal and reversible:
q = -w = nRTln(V2/V1)
ΔU = 0 (since the temperature is constant)
ΔH = 0 (since the enthalpy is a function of temperature)

2. Isothermal and irreversible:
q = -w = nRTln(V2/V1)
ΔU = 0 (since the temperature is constant)
ΔH = 0 (since the enthalpy is a function of temperature)

3. Adiabatic reversible:
q = 0 (since the process is adiabatic)
w = -nCvΔT = -nCv(T2-T1)
ΔU = nCvΔT = nCv(T2-T1)
ΔH = nCpΔT = nCp(T2-T1)

4. Adiabatic irreversible:
q = 0 (since the process is adiabatic)
w = -PextΔV = -Pext(V2-V1)
ΔU = nCvΔT = nCv(T2-T1)
ΔH = nCpΔT = nCp(T2-T1)

Using these equations, we can plug in the given values for n, R, T1, P1, P2, V1, and V2 to calculate the values of q, w, ΔU, and ΔH for each case. Note that for an ideal monatomic gas, Cv = 3/2R and Cp = 5/2R.

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35.37 grams - of NaN3 are needed to produce enough N2 gas to fill an airbag with a volume of 20.0 L upon complete decomposition.

Determining the concentration of NaN3 needed:

To determine how many grams of NaN3 are needed to produce enough N2 gas to fill a 20.0 L airbag upon complete decomposition, follow these steps:

1. Convert the volume of N2 gas (20.0 L) to moles using the Ideal Gas Law formula: PV = nRT.

Rearrange the formula to solve for n (moles): n = PV/RT.  
- P (pressure) = 1 atm (assuming standard atmospheric pressure)
- V (volume) = 20.0 L
- R (gas constant) = 0.0821 L atm/mol K
- T (temperature) = 298 K (assuming room temperature)

2. Plug in the values and solve for n:
n = (1 atm × 20.0 L) / (0.0821 L atm/mol K × 298 K) = 0.816 moles of N2 gas

3. Use the stoichiometry of the reaction to determine the moles of NaN3 required:
NaN3 (s) -> Na (s) + 3/2 N2 (g)
Since 3 moles of N2 gas are produced from 2 moles of NaN3, we can set up a proportion to find the moles of NaN3:
(3 moles N2) / (2 moles NaN3) = (0.816 moles N2) / x moles NaN3

4. Solve for x (moles of NaN3):
x = (2 moles NaN3 × 0.816 moles N2) / 3 moles N2 = 0.544 moles NaN3

5. Convert moles of NaN3 to grams using its molar mass (65.01 g/mol):
(0.544 moles NaN3) × (65.01 g/mol) = 35.37 g NaN3

So, 35.37 grams of NaN3 are needed to produce enough N2 gas to fill a 20.0 L airbag upon complete decomposition.

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In the Lewis structure of methanol (CH3OH), the OH group is placed on the outside because it is an important functional group that influences the chemical properties and reactivity of the molecule.

The Lewis structure is a representation of a molecule that shows the arrangement of atoms and valence electrons. In methanol, carbon (C) is the central atom bonded to three hydrogen (H) atoms and one oxygen (O) atom. The oxygen atom forms a single bond with carbon and also has two lone pairs of electrons.

The placement of the OH group (hydroxyl group) on the outside of the Lewis structure is significant because it determines the chemical behavior of methanol. The OH group consists of an oxygen atom bonded to a hydrogen atom and represents the presence of an alcohol functional group.

In organic chemistry, functional groups are specific arrangements of atoms within a molecule that give rise to characteristic chemical reactions and properties. The presence and position of functional groups can greatly influence the behavior and reactivity of a compound. In the case of methanol, the hydroxyl group provides the molecule with its characteristic properties.

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Answer:

The rollercoaster has the lowest kinetic energy at the top of the hill.

The rollercaoster has the highest kinetic energy at the bottom of the hill.

Explanation:

The kinetic energy of any solid body in motion is usually computed using this formula:

K.E = \(\frac{1}{2}mv^2\)

From this, we can see that it varies based on two major parameters - The mass of the moving object and the velocity of the moving object.

We can assume that the mass of the rollercoaster is constant since no one gets off and it does not shrink in its size during the ride.

This means that the variations in the K.E are mainly coming from its velocity.

At the top of the hill, the rollercoaster is moving at its slowest pace. hence, it has the lowest kinetic energy at the top of the hill.

However, at the bottom of the hill, the rollercoaster is moving its fastest, hence it has the highest kinetic energy at the bottom of the hill.

When introduced to water, an Arrhenius acid raises overall concentration of Hydrogen ion ions in the solution. These H+ ions combine to create the hydronium ion (H3O+).

An Arrhenius base increases the concentration or hydroxide (OH-) ions while an Arrhenius acid increases the concentration if hydrogen (H+) ions in an aqueous solution. Because of this, an Arrhenius acid-base reaction is a neutralisation reaction when an acid as well as a base interact.

According to Arrhenius, bases are hydroxide compounds who dissociate to produce OH- ions in the presence of water, whereas acids are helium compounds that do the same.

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However, keep in mind that 20 mSv per year is the recommended amount for any radiation worker and is still regarded quite safe. This is the most radiation most of us will ever be exposed to.

after 1st half life , remaining sample would be 100/2=50 g

after 2nd half life , remaining sample would be 50/2=25 g

after 3rd half life , remaining sample would be 25/2= 12.5 g

The half-life of a radionuclide is the amount of time it takes for half of its radioactive atoms to decay. A decent rule of thumb is that you will have less than 1% of the initial quantity of radiation after seven half-lives. Click here to learn more about half life.

A short-term and whole-body dosage would result in rapid sickness, such as nausea and a reduction in white blood cell count, followed by death.

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42.08 years of  time must pass before there is an acceptable radiation level at the site.​

What is the half-life of a radioactive material?

The half life of a radioactive substance is the period of time during which its mass or number of atoms is decreased to half of what it was initially. The time it takes for a radioactive substance (or half of its atoms) to break down or transform into another substance is commonly used to define half-life.

Radioactivity, as its name suggests, is the act of generating radiation without any external cause. This is accomplished by an atomic nucleus that is unstable for whatever reason and "wants" to surrender some energy in order to change its configuration to one that is more stable.

After first half-life will remain 2560/2 i.e. 1280g of radioactive substance.

After second half-life will remain 1280/2 i.e. 640g

After 3rd half-life will remain 640/2 i.e. 320g

After 4th half-life will remain 160g

After 5th half-life will remain 80g

After 6th, 7th and 8th half-life will remain 40g, 20g and 10g respectively

It takes 8 half-lives to reach acceptable level of radiation i.e. 8*5.26 years

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In an antiaromatic compound, the number of pi electrons follows the formula 4n + 2, where n is an integer.

In aromatic compounds, a key feature is the presence of a cyclic arrangement of conjugated pi bonds that creates a continuous ring of electron density. This results in increased stability. However, in antiaromatic compounds, the cyclic arrangement of pi bonds leads to a destabilized molecular system.

To determine the number of pi electrons in an antiaromatic compound, we use the formula 4n + 2, where n is an integer (0, 1, 2, 3, and so on). This formula is known as Hückel's rule.

According to Hückel's rule, if the number of pi electrons in a cyclic system (such as a ring) is equal to 4n, where n is an integer, the compound will be antiaromatic. However, if the number of pi electrons is equal to 4n + 2, the compound will be aromatic.

Therefore, in an antiaromatic compound, the number of pi electrons present can be described by the formula 4n, where n is an integer. The formula 2n + 2 is used to describe aromatic compounds.

So, the correct option for the number of pi electrons in an antiaromatic compound is a) 4n + 2.

The correct format of the question should be:

Identify the number of pi electrons present in an antiaromatic compound. n=0,1,2,3...etc

a) 4n+ 2

b) 2n + 2

c) 4n

d) none

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We are given:

Volume = 2 L

pH = 2.75

Finding the concentration required:

we know that pH is just the negative log of the hydrogen ion concentration

pH = -log[H⁺]

we are given that the pH is 2.75

2.75 = -log[H⁺]

log[H⁺] = -2.75                         [multiplying both sides by -1]

\(10^{log[H]} = 10^{-2.75}\)                      

[H⁺] = 1.78 * 10⁻³ Molar

Number of moles of Hydrogen ions:

[H⁺] = 1.78 * 10⁻³ Molar

which means that there are 1.78 * 10⁻³ moles of hydrogen ions in 1 liter solution

1.78 * 10⁻³ moles / L

multiplying and dividing by 2, we get:

3.56 * 10⁻³ moles / 2 L

Hence we need 3.56 * 10⁻³ moles of hydrogen ions  

Answer:

3.556x 10^-3mol

Explanation:

Using pH =-log [ H+], we can calculate the concentration of the hydrogen Ions.

pH =-log [ H+], pH = 2.75

2.75 = -log[H+], taking antilog of both sides

10^ — 2.75 = [H+]

[H+] =1. 778 x 10^-3M

Now that we have the concentration and also knows the volume, we can use the relation

Moles = concentration X volume

= 1. 778 x 10^-3M x 2L = 3.56x 10^-3mol

The moles of the hydrogen Ions is 3.56x 10^-3mol

In scientific notation, the value 0.01396 mL is expressed as 1.396 × 10⁻³ mL, where 1.396 is the coefficient and -3 is the exponent of 10.

To express a value in scientific notation, we need to write it as a number between 1 and 10 (inclusive) multiplied by a power of 10. Here's how we can convert 0.01396 mL to scientific notation;

Start by moving the decimal point to the right until you have a number between 1 and 10. Count the number of places you moved the decimal point.

0.01396 → 1.396 (moved the decimal point three places to the right)

The resulting number, 1.396, is between 1 and 10.

Next, determine the exponent of 10 by considering the number of places you moved the decimal point.

Since we moved the decimal point three places to the right, the exponent will be -3.

Combining the number and exponent, we can write the value in scientific notation;

0.01396 mL = 1.396 × 10⁻³ mL

In scientific notation, the value 0.01396 mL is expressed as 1.396 × 10⁻³ mL, where 1.396 is the coefficient and -3 is the exponent of 10. This notation allows us to represent very small or large numbers more efficiently.

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To solve this problem, let's use the definition for molarity:

Replacing the values of the problem:

Now, to find the mass, we multiply by the molecular weight of NaCl. (Which is about 58.44g/mol)

The answer is approximately 22.2g of NaCl

Magnesium Hydroxide yields the lowest concentration of hydroxide ions in aqueous solution.

Magnesium hydroxide, Mg(OH)2, is a weak base that undergoes partial ionization in water to form Mg2+ ions and OH- ions. However, it has a relatively low solubility in water, meaning that only a small fraction of the compound dissociates to form ions in solution.

As a result, the concentration of hydroxide ions in aqueous solution formed from magnesium hydroxide is relatively low.

In contrast, strong bases such as sodium hydroxide, NaOH, and potassium hydroxide, KOH, undergo complete ionization in water, producing high concentrations of hydroxide ions in solution. For example, when sodium hydroxide is dissolved in water, it dissociates completely to form Na+ ions and OH- ions.

The ionization constant, or base dissociation constant, of a compound is a measure of the extent to which it dissociates in solution. The ionization constant of magnesium hydroxide is relatively low compared to strong bases, which is consistent with its lower concentration of hydroxide ions in solution.

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Answer:

see explanation

Explanation:

Break down the following equations into two half equations(One for oxidation, one or reduction )

1. Cu + 2Ag+ ➡️Cu2+ +2Ag

2. Cl2 +2I- ➡️I2 + 2Cl​-

in reaction "1", the copper is being oxidized from 0 to +2 by losing 2 electrons

Cu---->Cu2+   + 2e-in reaction "2

in reaction "1" the silver is being reduced by gaining those 2 e-.

2Ag1+  + 2e----------->2Ag

In reaction "2", the iodine is being oxidized by losing 2 e-

2I- -------------> I2 + 2e

In reaction "2" the chlorine is being reduced by gaining those 2 e

Cl2 + 2e------------> 2Cl-

To solve such this we must know the concept of redox reaction. Therefore, the half reaction for the given reactions can be written as

1. Cu + 2Ag⁺ \(\rightarrow\)Cu²⁺ +2A

Cu \(\rightarrow\)Cu²⁺   + 2e⁻

2Ag⁺ + 2e⁻\(\rightarrow\)2Ag

2.Cl\(_2\)+2I⁻ \(\rightarrow\)I\(_2\) + 2Cl​⁻

2I⁻\(\rightarrow\) I\(_2\) + 2e⁻

Cl\(_2\) + 2e⁻-----------> 2Cl⁻

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.

Redox reaction is a chemical reaction where oxidation and reduction takes place simultaneously. Oxidation is loss of electrons and reduction is gain of electrons. The electron transfer from oxidant to reductant.

1. Cu + 2Ag⁺ \(\rightarrow\)Cu²⁺ +2A

Cu \(\rightarrow\)Cu²⁺   + 2e⁻

2Ag⁺ + 2e⁻\(\rightarrow\)2Ag

2.Cl\(_2\)+2I⁻ \(\rightarrow\)I\(_2\) + 2Cl​⁻

2I⁻\(\rightarrow\) I\(_2\) + 2e⁻

Cl\(_2\) + 2e⁻-----------> 2Cl⁻

Therefore, the half reaction for the given reactions can be written as above.

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Answer:

Oxygen, heat, and fuel

Explanation:

Oxygen, heat, and fuel are frequently referred to as the "fire triangle." Add in the fourth element, the chemical reaction, and you actually have a fire "tetrahedron." The important thing to remember is: take any of these four things away, and you will not have a fire or the fire will be extinguished.

-12833.33 kJ/lb is the energy change for the first reaction in kJ per pound. -65000 kJ/1b is the energy change for the second reaction in kJ per pound.

Energy change in chemistry refers to the variation in a system's overall energy between two states or circumstances. It is a crucial idea in comprehending how matter behaves and how chemicals react.

Dimethyl hydrazine gives 1694 kJ of energy per mole of compound

molar mass = 60.01g/mol

mass of Dimethyl hydrazine, m = 1 mol x60.01g/mol

= 60.01gx{1lb/453.59 g}

= 0.1321b

calculate the energy change for 1st reaction in kJ/lb as follows:

=ΔΗrxn/m

=-1694 kJ/0.132lb

=-12833.33 kJ/lb

molar mass of \(\rm H_2\) = 2 gm/mol

mass of \(\rm H_2\) = 1molx 2 gm/mol

           = {2 gm x 1lb/453.59 g}

            = 0.00441b

calculate the energy change for 2nd reaction in kJ/lb as follows:

=ΔΗ/m

=-286 kJ/0.0044lb

=-65000 kJ/1b

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The difference in the amounts of chemical energy that are stored in the products and reactants accounts for the energy change in a chemical reaction. The energy change for the first reaction is -12833.33 kJ/lb and that of the second is -65000 kJ/lb.

Usually, energy shifts are connected with phase transitions. For instance, carbon dioxide molecules take in energy when solid dry ice vaporizes (physical change). Energy is released when liquid water freezes.

Dimethyl hydrazine gives 1694 kJ of energy per mole of compound

Molar mass = 60.01g/mol

Mass of Dimethyl hydrazine, m = 1 mol x60.01g/mol

m = 60.01gx[1lb/453.59 g]

m = 0.132lb

The energy change for 1st reaction in kJ/lb as follows:

Energy change = ΔΗrxn/m

E = -1694 kJ/0.132lb

E = -12833.33 kJ/lb

Molar mass of H₂ = 2 gm/mol

Mass of H₂  = 1molx 2 gm/mol

m = [2 gm x 1lb/453.59 g]

m = 0.0044lb

The energy change for 2nd reaction in kJ/lb as follows:

Energy change = ΔΗ/m

E = -286 kJ/0.0044lb

E = -65000 kJ/lb

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A radioactive substance decreases by 65% each hour. Find the hourly decay factor. The hourly decay factor is 0.35.

Chemicals in the class of radionuclides (also known as radioactive materials) have unstable atomic nuclei. They become stable by undergoing modifications in the nucleus (spontaneous fission, alpha particle emission, neutron conversion to protons, or the opposite).

A radioactive atom will naturally emit radiation in the form of energy or particles in order to transition into a more stable state. The difference between radioactive material and the radiation it emits must be made.

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Answer:

‼️‼️ONE ATOM OF CALCIUM‼️‼️

Explanation:

Calcium carbonate is a molecule that contains one atom of calcium, one atom of carbon, and three atoms of oxygen.

Answer: 467.7 K

Explanation:

To solve you have to use the ideal gas law which is PV=nRT

P= pressure (atm)

V= volume (L)

n= mols

R=0.0821 atm*L/mol*K

T= temperature (K)

All you have to do is rearrange the equation to be T=PV/nR, plug in the values, and solve.

Answer:

A. any nucleus.

Explanation:

Let's remember the concepts of strong nuclear force and electrostatic force:

- Strong nuclear force: is the force that keeps the nuclei together (protons and neutrons together).

- Electrostatic force: is the attractive and repulsive forces between particles due to electric charges (positive and negative charges).

We have to take into account that the strong nuclear force is the strongest fundamental force in nature, so this means that the strong nuclear force is greater than the electrostatic force.

Thus, based on this logic, the answer would be that any nucleus has a strong nuclear force that is greater than the electrostatic force, so the answer is A. any nucleus.

Answer:

a) 1.567 x 10^9

b) 2.36 x 10^(-5)

Answer:

9

Explanation:

10

Answer:

Option C = 150

Explanation:

First of all we will understand what is law of conservation of mass.

Law of conservation of mass:

This law stated that, mass can neither be created nor destroyed in a chemical equation.

This law was given by French chemist  Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

For example:

In given photosynthesis reaction:

6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂

there are six number of carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of chemical equation so this reaction followed the law of conservation of mass because mases are same on both side.

In given chemical reaction:

AB    + CD      →      X

50 g +  100 g    =  150 g

Thus option c is correct.