what is the structure of alcohol?

Answer:

d

Explanation:

k-shell has the greatest binding energy

The combination in Option D , NaCl + HCl  is not a buffer

A buffer is a solution which is added to resist changes in pH when a small amount of acid.

It is generally made of weak base with its conjugated acid ,  weak acid with its conjugated base.

A buffer comes with a defined with a capacity .

Among the given option the solution mixture  which is not a buffer is

NaCl + HCl

as a buffer is not made of a strong acid and its salt.

Therefore Option D is not a buffer.

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Answer:

mass of kI = 74.55 Atomic mass

74.55 g ---> 1 mole

48.9 g --> ?

48.9 / 72

0.7 mole.

In one mole of kI --->

The New Deal program was to help the American economy recover from the Great Depression.

Franklin Delano Roosevelt was an American politician and attorney who served as the 32nd president of the United States from 1933 until his death in 1945.

Roosevelt promised the American people a "New Deal" if he was elected president in 1932. The goal of this New Deal program was to help the American economy to recover from the Great Depression.

Roosevelt's deal was based on providing economic relief to citizens, reforming institutions that failed during the early 1930's, and helping the overall economy to recover. This popular program lead FDR to be elected president 4 times.

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Answer/Explanation:

The boy's muscle energy changes into potential energy due to the height. it then converts into kinetic energy as it goes further upwards into the air.

A catalyst is a substance that increases the rate of a chemical reaction by lowering the activation energy without itself being consumed by the reaction.

Answer:

See below

Explanation:

1 year is how many seconds ?

1 year :

   365 days/ yr   *   24 hours / day  *  60 min/ hour * 60 seconds/ min

      =====  

see how the  'days'  'hours'  'min'    all cancel and you are left with

   'seconds'  / 'year'   ?      = 31 536 000 seconds/year

Answer:

Brainly or Chegg tutors.

Explanation:

Try those!

Answer:

A

Explanation:

because rate of diffusion is inversely proportional to molecular mass

The combination of high molecular mass and low temperature gives the slowest rate of diffusion.The correct option is c.

When it comes to diffusion, the rate at which a gas spreads out depends on its molecular mass and temperature.

Molecular mass refers to the weight of the gas molecules. The larger the molecules, the slower they move and the slower they diffuse. Therefore, gases with higher molecular mass diffuse more slowly than those with lower molecular mass.

Temperature also affects the rate of diffusion. At higher temperatures, gas molecules have more energy and move faster, resulting in a faster diffusion rate. On the other hand, at lower temperatures, gas molecules have less energy and move slower, leading to a slower diffusion rate.

So, when we combine high molecular mass and low temperature, we have both factors working against a fast diffusion rate. The gas molecules are heavy, which slows down their movement, and the low temperature reduces their energy and speed. As a result, this combination gives us the slowest rate of diffusion.

In summary, the combination of high molecular mass and low temperature gives the slowest rate of diffusion.The correct option is C.

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Answer:

I don't know the answer, but I can give options :)

Explanation:

A gas such as carbon monoxide would be most likely to obey the ideal gas law at:

Option 1) High temperatures and low pressure.

Option 2) Low temperatures and high pressure.

Option 3) High temperatures and high pressure.

Option 4) Low temperatures and low pressure.

Answer:

The gas must occupy 0 volume at -273°celcius

Answer:

Π = 21.9 atm

Explanation:

The equation used to find osmotic pressure is:

Π = iMRT

In this formula,

   >> Π = osmotic pressure (atm)

   >> i = van't Hoff factor

   >> M = molarity (M)

   >> R = constant (0.0821 atm*L/mol*K)

   >> T = temperature (K)

Remember, van't Hoff factor is the amount of ions the species (MgCl₂) dissociates into while in solution. MgCl₂ dissociates into 3 ions. These ions are Mg²⁺ and 2 Cl⁻.

The temperature needs to be in Kelvin....

37.0 °C + 273.15 = 310.15 K

You now know the value of all the variables.

Π = iMRT

Π = (3)(0.287 M)(0.0821 atm*L/mol*K)(310.15 K)

Π = 21.9 atm

Answer:

4.22% NaBr

Explanation:

To find the mole fraction of NaBr, you need to (1) determine the mass of the solute (NaBr) and the solvent (H₂O), then (2) convert the mass of the solute and solvent to moles (via the molar masses), and then (3) calculate the mole fraction of NaBr. The final answer should have 3 sig figs to match the sig figs of the given value (20.1%). Because you are given a percent less than 100%, you can assume that the percent (20.1%) is equal to the mass of the solute (20.1 g).

(Step 1)

100% - 20.1 % NaBr = 79.9% H₂O

20.1% NaBr = 20.1 g NaBr

79.9% H₂O = 79.9 g H₂O

(Step 2)

Molar Mass (NaBr): 102.89 g/mol

20.1 g NaBr              1 mole
-------------------  x  ---------------------  =  0.195 mole NaBr
                                102.89 g

Molar Mass (H₂O): 18.016 g/mol

79.9 g H₂O            1 mole
------------------  x  -------------------  =  4.43 moles H₂O
                              18.016 g

(Step 3)

                                          moles of solute      
Mole Fraction =  ----------------------------------------------------   x 100%
                            moles of solute + moles of solvent
                             

                                            0.195 mole NaBr
Mole Fraction =  --------------------------------------------------------  x 100%
                            (0.195 mole NaBr) + (4.43 moles H₂O)

Mole Fraction  =  4.22% NaBr

Answer:

0.0422

Explanation:

Right on Acellus

The temperature scale required for gas law calculations is Kelvin , The temperature of the gas is 363 in Kelvin.

According to Gas law , for a unit mole of ideal gas the product of pressure to volume is equal to the product of Universal Gas Constant and Temperature.

it is written as

PV = RT

It is given that A reaction forms a gas at 90.4 °C.

The temperature scale required for gas law calculation is Kelvin

Temperature in Kelvin = Temperature in degree Celsius +273

Temperature in Kelvin = 90.4 +273

Temperature in Kelvin = 363 K

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Answer:

9.6 mol

Explanation:

Start by writing out the balanced equation of the reaction.

2[tex]H_{2}[/tex] + [tex]O_{2}[/tex] ⇒ 2[tex]H_{2}O[/tex]

Here you will see 2 mol of hydrogen for every 1 mol of oxygen. Using this ratio, you can assume the amount of hydrogen will always be double that of oxygen. In this case, 4.8 * 2 = 9.6

Answer:

6.67 mg/kg     per dose   ( 26.67 mg/kg   per day)

Explanation:

400 mg / 60 kg = 6 2/3  mg/kg  per dose

   per DAY  is  four times this number

Answer:

175K

Explanation:

(-145°F − 32) × 5/9 + 273.15 = 174.817K

174.817 ---> 175 (Rounded to whole number/ ones place)

Answer:

KCl

Explanation:

Ionic compounds are formed between atoms with very different electronegativity (EN) values. The elements with the highest EN values are on the top-right of the periodic table.

Ionic compounds are also generally between a metal and nonmetal. Nonmetals are located in the p-block (the right) of the periodic table and metals are pretty much everywhere else.

That being said, water (H₂O), CO, and CO₂ contain elements that have too similar of EN values to ionically bond.

However, the elements in KCl have different enough EN values to undergo ionic bonding by donating/receiving electrons from each other.

The combustion of the fatty acid called stearic acid has the  the complete equation; C18H36O2(s) + 26O2(g) ------> 18CO2 (g) + 18 H2O(g)

The term combustion has to do with the burning of a substance in air. For organic compounds, we get carbon dioxide and water as the products.

Thus, for the combustion of the fatty acid called stearic acid, the complete equation is; C18H36O2(s) + 26O2(g) ------> 18CO2 (g) + 18 H2O(g)

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The specific heat of the metal object with a mass of 22.7g heated to to temperature of 97.0°C and then transferred to an insulated container containing 84.7 g of water at 20.5 ∘C is 0.815J/g°C

How to calculate specific heat?

The specific heat capacity of a metal can be calculated using the calorimetry equation as follows:

Q = mc∆T

Where;

Q = quantity of heat absorbed

m = mass of substance

c = specific heat capacity

∆T = change in temperature

mc∆T (water) = -mc∆T (metal)

84.7 × 4.18 × 3.8 = - (22.7 × c × -72.7)

1345.375 = 1650.29c

c = 0.815J/g°C

Therefore, the specific heat of the metal object with a mass of 22.7g heated to to temperature of 97.0°C and then transferred to an insulated container containing 84.7 g of water at 20.5 ∘C is 0.815J/g°C.

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The limiting reactant between the reaction of 6 moles of oxygen and 12 moles of mercury is mercury (Hg)

4Hg + O₂ —> 2Hg₂O

From the balanced equation above,

4 moles of Hg reacted with 1 mole of O₂

From the balanced equation above,

4 moles of Hg reacted with 1 mole of O₂

Therefore,

12 moles of Hg will react with = 12 / 4 = 3 moles of O₂

From the above calculation, we can see that only 3 moles of O₂ out of 6 moles given is required to react completely with 12 moles of Hg.

Thus, Hg is the limiting reactant and O₂ is the excess reactant .

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Answer:

8 significant figures

Explanation:

All numbers (that are not zero) are always significant. Because there is a zero at the end of the number after the decimal place, this makes this zero also significant. This zero is significant because it makes the number more precise. Therefore, all of the numbers in this number are significant.

Answer:

There are 8 sig figs

Explanation:

Calculate the normality of 1 Kg of aluminum sulfide in 5000 ml of solution.

Normality comes out to be 8.11

n-factor for [tex]Al_{2}S_{3}[/tex] is 6 and molar mass is 148g

So, on calculating equivalent mass is equal to 24.66g

FORMULAE of Normality (N) = (Mass of the solute) / (Equivalent mass of the solute (E) × Volume of the solution (V)

                                           N=[tex]\frac{1000}{24.66*5}[/tex]

                                          N=8.11

Therefore, normality of 1 kg aluminum sulfide is 8.11

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It is important to record all accidents and breakages that occur in the laboratory to prevent them from happening again.

Laboratory accident is defined as the type of accident that occurs in the laboratory leading to harm.

Example of laboratory accidents include the following:

A record of these type of laboratory accidents would hel prevent it's reoccurrence.

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The standard reaction enthalpy and the standard reaction enthalpy at 400 K for this reaction are equal to 0.35 kJ and 0.000125 kJ respectively.

Mathematically, the Gibbs's free energy for this chemical reaction can be calculated by using this formula:

ΔG° = -RTlnK = ΔH° - TΔS°    ......equation 1.

First of all, we would determine the value of lnK from the given expression at 390 K and 410 K respectively:

lnK = A + B/T + C/T²

lnK = -1.04 - 1088/T + 1.51 × 10⁵/T²    

lnK = -1.04 - 1088/390 + 1.51 × 10⁵/390²

lnK = -1.04 - 2.79 + 0.99

lnK = -2.84.

At T = 410 K, we have:    

lnK' = -1.04 - 1088/410 + 1.51 × 10⁵/410²

lnK' = -1.04 - 2.65 + 0.90

lnK' = -2.79.

For the standard reaction enthalpy, we have:

lnK' - lnK = ΔH°/R(1/T - 1/T')

-2.79 - (-2.84) = ΔH°/8.314(1/390 - 1/410)

-2.79 + 2.84 = ΔH°/8.314(0.00256 - 0.00244)

0.05 = ΔH°/8.314(0.0012)

0.4157 = 0.0012ΔH°

ΔH° = 0.4157/0.0012

ΔH° = 346.42 ≈ 0.35 kJ.

Next, we would determine the Gibbs's free energy at each temperature:

At T = 390 K, we have:

ΔG° = -RTlnK

Δ₁G° = -8.314 × 390 × (-2.84)

Δ₁G° = 9.21 kJ/mol.

At T = 410 K, we have:

Δ₂G° = -8.314 × 410 × 2.79

Δ₂G° = 9.51 kJ/mol.

For the standard reaction enthalpy at 400 K, we have:

ΔG° = ΔH° - TΔS°

9.51 - 9.21 = 0.35 - 400ΔS°

0.30 = 0.35 - 400ΔS°

400ΔS° = 0.35 - 0.30

400ΔS° = 0.05

ΔS° = 0.05/400

ΔS° = 0.000125 kJ.

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Answer:

Option 1

Explanation:

You need to make the number of each type of atom on both sides the same, and this can only be done by changing the coefficients.

Answer:

CH3-CH3 in a compound name is Ethane

Explanation:

hope it will help you

Option (b) is correct.

​​​

          A separation technique called filtration is used to isolate pure chemicals from mixtures of particles, some of which are big enough to be caught by a porous medium.

         The separation of combinations of two or more pure liquids is accomplished through distillation. The components of a liquid mixture are vaporized, then condensed and isolated during the purifying process of distillation.

          Chromatography is the process of separating a mixture by passing it through a medium where the components move at various speeds, either in solution, suspension, or as a vapor (as in gas chromatography).

         The magnetic separation process involves attracting magnetic materials using a magnet to separate the components of mixes. Non-magnetic compounds are separated from magnetic ones using the magnetic separation technique.

From the above separation techniques, we can say that option(b) Distillation a separation process that uses boiling points to separate the component of a mixture is correct.

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