If the half-life of a drug degrading as a first-order reaction is 12hrs, how many days will it take until only 12.5% of the initial concentration remains?

Answer:

Explanation:

To solve this problem, we can use the ideal gas law, which relates the pressure, volume, temperature, and number of moles of a gas:

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 initial temperature of 25 °C to Kelvin:

T1 = 25 °C + 273.15 = 298.15 K

Then, we can use the initial conditions to find the number of moles of gas:

n = PV/RT1

where we can assume that the pressure is atmospheric pressure (1 atm) and R is the ideal gas constant (0.0821 L·atm/mol·K).

n = (1 atm)(0.5 L)/(0.0821 L·atm/mol·K)(298.15 K) = 0.0204 mol

Next, we can use the final temperature of 54 °C (327.15 K) to find the final volume:

V2 = nRT2/P

V2 = (0.0204 mol)(0.0821 L·atm/mol·K)(327.15 K)/(1 atm) = 0.551 L

Finally, we can subtract the initial volume from the final volume to find the potential volume increase:

ΔV = V2 - V1 = 0.551 L - 0.5 L = 0.051 L

Therefore, if the aerosol can is heated to 54 °C, the potential volume of the gas contained in the can would increase by approximately 0.051 L. However, this increase in volume would cause a corresponding increase in pressure, which could lead to an explosion if the can is not designed to withstand the increased pressure.

Answer:Covalent bonds tend to form between metals and nonmetals.

Explanation:

Answer:

Forgery cases in California are indeed difficult for a prosecutor to prove in court. ... It is also true that these cases are legally complex and may involve multiple documents, multiple victims, and hold serious felony penalties.

Answer:

A-Pacific Ocean

B-Arctic Ocean

C-Atlantic Ocean

D-Indian Ocean

E-Southern Ocean

Explanation:

got it right on edge 2020!!

Answer:

other guy is 100% correct

Explanation:

The energy differences and corresponding wavelengths depend on the energy levels involved in each transition. So, without specific energy levels, it's not possible to provide a definitive ranking.

In a hydrogen atom, electron transitions occur when an electron moves from one energy level to another. Each transition is associated with the emission of electromagnetic radiation, which can be characterized by its wavelength.

To rank the electron transitions in terms of the longest to shortest wavelength of radiation emitted, we need to consider the energy levels involved in each transition. The energy levels in a hydrogen atom are labeled with whole numbers, with the lowest energy level being labeled as n=1.

Here's a step-by-step explanation to determine the order of the electron transitions:

1. Identify the energy levels involved in each transition. The transitions are labeled using the notation n1 to n2, where n1 and n2 represent the initial and final energy levels, respectively.

2. Recall that the energy of an electron in a hydrogen atom is given by the equation E = -13.6/n^2, where n is the principal quantum number representing the energy level.

3. Calculate the difference in energy between the initial and final energy levels for each transition by subtracting the energy of the initial level from the energy of the final level.

4. The energy difference corresponds to the energy of the emitted radiation, which is directly related to the wavelength. A higher energy difference corresponds to shorter wavelengths, while a lower energy difference corresponds to longer wavelengths.

5. Arrange the transitions in order from the longest wavelength (top) to the shortest wavelength (bottom) based on their energy differences. The transition with the largest energy difference will emit radiation with the shortest wavelength, while the transition with the smallest energy difference will emit radiation with the longest wavelength.

Remember, the energy differences and corresponding wavelengths depend on the energy levels involved in each transition. So, without specific energy levels, it's not possible to provide a definitive ranking. However, if you provide the energy levels for the transitions, I can assist you in determining the order.

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Answer:

P2 = 4.76 atm

Explanation:

Given:

T1 = 235K. P1 = 3.80 atm

T2 = 298K. P2 = ?

Here, we use Gay-Lussac's law:

P1/T1 = P2/T2

Solving for P2, we get

P2 = (T2/T1)P1

= (298K/238K)(3.80 atm)

= 4.76 atm

Answer:

The answer is in my attachment

Explanation:

hope this helped!

To determine the limiting reactant and the amount of excess reactant remaining, we need to compare the amount of each reactant with their respective stoichiometric coefficients in the balanced chemical equation.

The balanced equation for the reaction between carbon monoxide (CO) and oxygen (O2) to form carbon dioxide (CO2) is:

2 CO + O2 -> 2 CO2

First, we need to convert the given masses of CO and O2 to moles.

Moles of CO = mass / molar mass = 11.2 g / 28.01 g/mol = 0.399 mol

Moles of O2 = mass / molar mass = 9.69 g / 32.00 g/mol = 0.303 mol

Next, we compare the mole ratios between CO and O2 in the balanced equation. The ratio is 2:1, which means that 2 moles of CO react with 1 mole of O2.

From the given amounts, we have less O2 (0.303 mol) compared to the stoichiometric requirement of 2 moles for every 2 moles of CO. Therefore, O2 is the limiting reactant.

To determine the amount of excess reactant remaining, we need to calculate the amount of CO that would have reacted with the limiting amount of O2.

Using the stoichiometry, we can find the amount of CO required to react with 0.303 mol of O2:

Required moles of CO = (0.303 mol O2) × (2 mol CO / 1 mol O2) = 0.606 mol CO

Since we initially had 0.399 mol of CO, the excess amount of CO is:

Excess moles of CO = 0.399 mol CO - 0.606 mol CO = -0.207 mol CO

The negative value indicates that there is no excess CO remaining. Therefore, the amount of excess CO remaining after the reaction is complete is 0 grams.

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Answer:

B. 96.12 g

Explanation:

To solve this question we must convert each reactant to moles. Using the balanced equation we can find limiting reactant. With moles of limiting reactant we can find the moles of methanol and its mass:

Moles CO -Molar mass: 28.01g/mol-

140.1g CO * (1mol / 28.01g) = 5.0 moles CO

Moles H2 -Molar mass: 2.01g/mol-

12.12g * (1mol / 2.01g) = 6.03 moles H2

For a complete reaction of 5.0 moles of CO are required:

5.0moles CO * (2mol H2 / 1mol CO) = 10.0 moles of H2 are required

As there are just 6.03 moles, H2 is limiting reactant.

The moles of methanol produced are:

6.03 moles H2 * (1mol CH3OH / 2mol H2) = 3.015 moles CH2OH

Mass CH3OH -Molar mass32.04g/mol-:

3.015 moles CH2OH * (32.04g/mol) =

96.6g CH3OH ≈ B. 96.12 g

The actual concentration of the standardized KOH solution (x) in the equation above to find the concentration of the unknown HCl solution.

In order to determine the concentration of the unknown hydrochloric acid (HCl) solution, we'll first need to know the concentration and volume of the standardized potassium hydroxide (KOH) solution used for titration. Since the volume of KOH used to fully react with the HCl is given (21.27 mL), let's assume the concentration of KOH to be "x" mol/L.
The balanced chemical equation for the reaction between KOH and HCl is:
KOH (aq) + HCl (aq) → KCl (aq) + H₂O (l)
From this equation, we can see that the mole ratio between KOH and HCl is 1:1.
To determine the concentration of the unknown HCl solution, we'll need to use the following equation for titration:
(C₁)(V₁) = (C₂)(V₂)
Where C₁ and V₁ are the concentration and volume of KOH, and C₂ and V₂ are the concentration and volume of HCl, respectively.
Let's plug in the given values and solve for the unknown concentration of HCl (C₂):
(x mol/L)(21.27 mL) = (C₂)(20.00 mL)
C₂ = (x mol/L)(21.27 mL) / 20.00 mL
Now, you'll need to substitute the actual concentration of the standardized KOH solution (x) in the equation above to find the concentration of the unknown HCl solution.

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The reabsorption of sodium under the influence of aldosterone occurs primarily in the distal convoluted tubule.

The distal convoluted tubule (DCT) is a brief nephron segment, interposed among the macula densa and amassing duct. even though it is brief, it plays a key position in regulating the extracellular fluid volume and electrolyte homeostasis.

Sodium absorption by means of the distal tubule is mediated with the aid of the hormone aldosterone. Aldosterone increases sodium reabsorption. Sodium and chloride (salt) reabsorption is likewise mediated with the aid of a collection of kinases known as WNK kinases.

The distal convoluted tubule (DCT) is a part of the kidney nephron between the loop of Henle and the gathering duct system. It's miles partially chargeable for the regulation of potassium, sodium, calcium, and pH. it's far the primary website for the kidneys' hormone primarily based regulation of calcium (Ca).

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The sample volume of propane, a component of lp gas at STP, is 37.12L.

The combined gas law combines the principles of Gay-Lussac, Boyle, and Charles.

According to the combined gas equation, P1×V1/T1 = P2×V2/T2

Assuming the gas is an ideal gas will help us solve this problem. We can then apply the combined gas equation, P1×V1/T1 = P2×V2/T2.

Where,

P1 = initial pressure of the gas = 922 torr = 1.213 atm

P2 = final pressure of the gas at STP = 1 atm

V1 = initial volume of the gas = 35.3 L

V2 = at STP final volume of the gas  =?

T1 = initial temperature of the gas = 315 K

T2 = final temperature of the gas at STP = 273 K

By using the following equation and putting the given values, we obtain:

P1×V1/T1 = P2×V2/T2

Hence, V2 = P1×V1×T2 / T1×P2

V2 = 1.213×35.3×273 / 315×760

Therefore, the volume of the gas at STP is, 37.12 L

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The percent of heat radiation reflected by the different types of surfaces that Earth has (i.e snow, rock, forest, etc.) can be quantified or measured as Albedo.

Albedo is the percentage of sunlight that is reflected off of a surface. The higher the albedo, the more reflective the surface is. Different surfaces have different albedos. For example, fresh snow has a high albedo, while a forest has a low albedo.

The albedo of a surface can have a big impact on the climate. If a surface has a high albedo, it will reflect more heat and stay cooler. If a surface has a low albedo, it will absorb more heat and become warmer.

You can measure the albedo of a surface with a simple device called an albedometer. By measuring the amount of sunlight that is reflected off of a surface, you can calculate the albedo.

Surfaces with a high albedo are important in helping to regulate the Earth’s climate. They help keep the Earth cool by reflecting back sunlight.

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NO₂ , SO₃ and CO are covalent compounds and LiCl is ionic in nature.

The definition of an ionic compound is chemical compound composed of ions which is held together by electrostatic forces i.e. held together by ionic bonds. They are formed by ions of opposite charge. The compound is neutral but it consists of a positively and negatively charged cations and anions.

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Answer:

Explanation:

a) 202.4 g

b) 185.24 m

c) 0.13 dm

d) 6.91 L

e)0.0546 mol

f) 2.7 s

g) 42kg

h) 0

i) -0.11 g

j) -0.34 mL

Answer: B: a solvent

Explanation: I hope this helps!

Answer:

B

Explanation: hoped this helped!!!

Answer:

it is c no cap

Explanation: C

We can make use of the fact that the total pressure of the mixture is the same as the sum of the partial pressure of all the gases in the container. As a result, 400 kPa is the third gas' partial pressure.

The overall pressure exerted by a mixture of gases is equal to the sum of the partial pressures of each of the constituent gases, according to Dalton's law of partial pressures. The partial pressure is the pressure that each gas would have if it occupied the same volume of the mixture at the same temperature on its own.

Mathematically, this can be stated as:

P_total = P_1 + P_2 + P_3

When we plug these figures into the formula, we get:

800 kPa = 100 kPa + 300 kPa + P_3

When we simplify this equation, we obtain:

800 kPa = 400 kPa + P_3

By taking away 400 kPa from both sides, we arrive at:

P_3 = 400 kPa

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Answer:

Water is a remarkable substance, and its unique properties are largely due to the presence of polar covalent bonds and hydrogen bonds in its structure. These characteristics play a crucial role in the physical and chemical properties of water, making it essential for life as we know it.

Explanation:

The polar covalent bonds in water arise from the unequal sharing of electrons between oxygen and hydrogen atoms. This results in the oxygen atom having a partial negative charge (δ-) and the hydrogen atoms having partial positive charges (δ+). These charges create polarity within the water molecule, leading to the formation of hydrogen bonds.

Hydrogen bonds occur when the partially positive hydrogen atom of one water molecule is attracted to the partially negative oxygen atom of another water molecule. These hydrogen bonds are relatively weak individually, but when present in large numbers, they contribute to the cohesion, surface tension, and high boiling point of water.

The importance of these bonds is manifold. The cohesion between water molecules due to hydrogen bonding enables water to form droplets, have a high surface tension, and flow freely, facilitating transport within organisms and in the environment. Additionally, hydrogen bonding leads to the high specific heat capacity and heat of vaporization of water, making it an effective regulator of temperature in living organisms and ensuring stable environmental conditions.

Furthermore, hydrogen bonds play a crucial role in the unique properties of water as a solvent. The polar nature of water allows it to dissolve a wide range of substances, including ionic compounds and polar molecules, facilitating various biological processes such as nutrient transport and chemical reactions in cells.

While picking up a buret, an unknown solution left by a previous solution drips onto your hand - Gloves

While pulling an empty beaker off the shelf at the beginning of lab, it slips out of your hand onto the floor - Closed-toe shoes

While checking on a stirring solution, the solution splashes up towards your face - Goggles

While transferring a solution from a flask to a beaker, the solution accidentally spills down the front of the lab bench - Lab coat

Explanation:

So, according to the question. the matches will be:

While picking up a buret, an unknown solution left by a previous solution drips onto your hand - Gloves

While pulling an empty beaker off the shelf at the beginning of lab, it slips out of your hand onto the floor - Closed-toe shoes

While checking on a stirring solution, the solution splashes up towards your face - Goggles

While transferring a solution from a flask to a beaker, the solution accidentally spills down the front of the lab bench - Lab coat

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To balance a chemical equation, both sides should have equal mass, or in other words both sides should have same number of atoms as to follow the conservation of mass rule.

P + O₂ = P₄O₆

LHS:

Number of Phosphorus atoms = 1 atom

Number of Oxygen atoms = 2 atoms

RHS:

Number of Phosphorous atoms = 4 atoms

Number of Oxygen atoms = 6 atoms

Also since P₄O₆ has the most number of atoms we will make the LHS equalize to P₄O₆.

Difference between Phosphorous atoms in LHS to RHS = 3

Since phosphorous is a monatomic we need 3 phosphorous atoms extra

Difference between Oxygen atoms is LHS to RHS = 4

But Oxygen is diatomic, so we need 4/2 = 2 Oxygen molecules

Now lets see if it is balanced

P + 3P + O₂ + 2O₂ -------> P₄O₆

               4P + 3O₂ ------>  P₄O₆

LHS:

Phosphorous atoms = 4 atoms

Oxygen atoms = 3 × 2 = 6 atoms

RHS:

Phosphorous atoms = 4 atoms

Oxygen atoms = 6 atoms

LHS = RHS

Therefore the balanced equation is 4P + 3O₂ =  P₄O₆

Happy to help :)

If you need more explanation or help in any other question, feel free to ask

10,000 lbm/hr is the mass flow rate of the stream as a whole. Benzene (C6H6) and toluene are two organic substances that enter a separation column (C7H8).

The correct option is d.

In order to make polystyrene, benzene, a colorless liquid with a distinct odor, is primarily used. It is incredibly toxic, a known carcinogen, and leukemia has been related to exposure to it.

Benzene is a typical chemical used in industry.

internal combustion engines are fuelled by a derived mixture of highly combustible liquid hydrocarbons. The vast bulk of gasoline is used in automobile engines. infrastructure for blending as well as refining petroleum products.

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​Nucleotide . A nucleotide is made up of a sugar molecule (ribose in RNA or deoxyribose in DNA) linked to a phosphate group and a nitrogenous base Two strands make up a DNA molecule.

Adenine (A), cytosine (C), guanine (G), and thymine are the bases utilized in DNA (T). Nitrogenous base: A nitrogen-containing molecule with the chemical characteristics of a base. Adenine (A), guanine (G), thymine (T), and cytosine are the nitrogenous bases found in DNA (C). With one exception, the nitrogenous bases of RNA are the same: adenine (A), guanine (G), uracil (U), and cytosine (C). The DNA molecule is a nucleotide polymer. A nitrogenous base, a five-carbon sugar (deoxyribose), and a phosphate group make up each nucleotide. DNA has four nitrogenous bases, two purines (adenine and guanine), and two pyrimidines (cytosine and thymine). Two strands make up a DNA molecule.

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Answer:

Number of bacteria in 100 gallons 757082.4×10⁴.

Explanation:

Given data:

Number of bacteria in one drop of water = 2×10⁴

Number of bacteria in 100 gallons = ?

Solution:

It is given that one drop of water is equal to the 1mL.

Now we will calculate the number of milliliters in 100 gallons.

1 gallons = 3785 mL

100× 3785.412 mL = 378541.2 mL

Now we will calculate the number of bacteria in 378541.2 mL or 100 gallons.

378541.2 mL × 2×10⁴ bacteria

757082.4×10⁴ bacteria

Ethanol.

Formula: C2H5OH

Molar mass: 46.07 g/mol

Density: 789 kg/m³

Answer:

Mass of lead = 89.7 g

Explanation:

Given data:

Volume of lead = 7.91 cm³

Density of lead = 11.34 g/cm³

Mass of lead =  ?

Solution:

Formula:

d = m/v

d = density

m = mass

v = volume

Now we will put the values in formula.

11.34 g/cm³ = m/7.91 cm³

m = 11.34 g/cm³ × 7.91 cm³

m = 89.7 g

Answer:

C stay away from trees, water, and tall objects.

Explanation:

took the quiz and got it right :)

A person trapped outside during a thunderstorm should stay away from the following:

This is defined as a rain shower during which you hear thunder with a corresponding lightning.

It is best to avoid trees, water, and tall objects during thunderstorms to prevent accidents and death.

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Answer:

The balloon will expand

Explanation:

Steam needs more space than the equivalent wt amount of liquid

Answer:

Mostly, the molecule has a planar geometry allows free rotation of bonds. The chemical structure of the compound could be given as below. Urea Formula Molecular Mass. This molecule is generally available in final products of proteins of metabolism of humans and animals. Its main existence can be felt in the urine of humans that is formed

Explanation:

the molecular formula of urea is CH4ON2 if the %by mass of 02 atoms is one mole of urea molecule is 26.66%