Many medical pet scans use the isotope 18f, which has a half-life of 1.8 hours. a sample prepared at 10:00 am has an activity of 20 mci. what is the activity at 1:00 pm when the patient is injected?

Answer:

Explanation:

CaCO3 = 1*Ca + 1*C + 3*O

              =1*40 + 1*12 + 3*16

               =40 + 12 + 48

               =100 amu

Answer:

B. with more motion of particles within a substance.

Answer:

B. with more motion of particles within a substance.

Hope this helps!

A 54-year-old client has a cholesterol level of 240 mg/dl (6.2064 mmol/l).  this client would have a high serum concentration of cholesterol.

Individuals or groups seeking professional advice or services, such as lawyers, accountants, advertising agencies, and architects. Those who receive benefits or services from social welfare corporations, government agencies, etc. Someone who is under the patronage of someone other than the customer.

An example client is a student teaching at a university writing center. A terminal or computer is connected to the server. A person receiving help or advice from a professional (lawyer, accountant, social worker, psychiatrist, etc.). A client, used in home and business networks, is any computer hardware or software device that requests access to services provided by a server. A client is usually considered a requesting program or user in a client/server architecture.

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The final temperature of the gas, after absorbing 1300 J of heat and doing 2200 J of work, is approximately 375.45 K.

To find the final temperature (T_final) of the gas, we can use the first law of thermodynamics, which states that the change in internal energy (ΔU) of a system is equal to the heat added (Q) minus the work done (W) by the system:

ΔU = Q - W

Since the gas is ideal and monatomic, the change in internal energy is related to the temperature change (ΔT) through the equation:

ΔU = nC_vΔT

where n is the number of moles and C_v is the molar heat capacity at constant volume.

Rearranging the equations and substituting the given values:

nC_vΔT = Q - W

(5.00 mol)(3/2R)ΔT = 1300 J - 2200 J

(5.00 mol)(3/2)(8.3145 J/(mol⋅K))ΔT = -900 J

Simplifying:

(37.9725 J/K)ΔT = -900 J

ΔT = -900 J / (37.9725 J/K)

ΔT ≈ -23.70 K

Since the initial temperature is 126 °C, we convert it to Kelvin:

T_initial = 126 °C + 273.15 = 399.15 K

Now we can find the final temperature:

T_final = T_initial + ΔT

T_final = 399.15 K - 23.70 K

T_final ≈ 375.45 K

Therefore, the final temperature of the gas is approximately 375.45 K.

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Answer:

8.24 mL

Explanation:

Density can be defined as mass per unit volume, according to the relationship shown in the attached image. Moles (a unit of measurement for small entities) can also be related to mass. Let's look at two formulas which would be useful for answering this question.

\(\boxed{\text{Density}=\frac{\text{Mass}}{\text{Volume}} }\)

\(\boxed{\text{Mole}\times\text{Mr}=\text{Mass (in grams)}}\) , where Mr stands for relative molecular mass

From the periodic table the Mr of nickel is 58.7.

Multiply the number of moles by the Mr:

Mass of Ni

= 1.25(58.7)

= 73.375 g

Calculate the volume of Ni:

Volume

= mass ÷density

= 73.375 ÷8.90

= 8.24 ml (3 s.f.)

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Answer:

59.46 g

Explanation:

To answer this question, the molecular weight of ammonium sulfate must be computed.  To accomplish this, the weights of the individual elements must be noted.
N=14.01\(\frac{g}{mol}\)

H=1.01\(\frac{g}{mol}\)

S=32.07\(\frac{g}{mol}\)

O=16.00\(\frac{g}{mol}\)

To compute the molecular weight:

\(2[14.01\frac{g}{mol}+4(1.01\frac{g}{mol})]+32.07\frac{g}{mol}+4(16.00\frac{g}{mol})=132.14\frac{g}{mol}\)

To calculate the mass:

\(0.45 mol(\frac{132.14g}{1mol})=59.463g\)

Answer:

You can only use bond enthalpies directly if everything you are working with is in the gas state.

Explanation:

If you have one or more liquids present, you need an extra energy term to work out the enthalpy change when you convert from liquid to gas, or vice versa

Of course, bond energies exist for liquids and solids. But we measure it for gas only, because there there is no influence from the solvent. We work at low pressure to be able to use the main hypothesis of perfect gas : one molecule exists as if it were alone, free of the interaction of other molecules. Thus the energy we measure by breaking the molecule is as close to the real bond energy as possible.Hope it helps, and hope it's right !

By using the combined gas law, the volume of the gas is found to be 212.81mL when the pressure and temperature is changed.

The Combined Gas Law combines the provisions of Charles Law, Boyle's Law, and Gay Lussac's Law. According to the Combined Gas Law, a gas pressure x temperature x volume = constant. The combined gas law is essentially a reworking of the ideal gas law, with both n (moles of gas) and R (already constant) remaining constant. It may be used to compute the conditions of the resultant system based on changes in pressure, temperature, or volume.

Given:

P1 = 420 mm Hg

V1 = 500mL

T1 = 20℃ = 20 + 273 = 293K

P2 = 650 mm Hg

T2 = -80℃ = -80 + 273 = 193K

To find:

V2 = ?

Formula:

P1V1 / T1 = P2V2 / T2

Calculations:

V2 = P1V1T2 / T1P2

V2 = 420 x 500 x 193 / 293 x 650

V2 = 212.81mL

Result:

The volume of the gas is found to be 212.81mL

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If a sound wave refracts,It changes its speed and wavelength when it bounces off of a solid surface,It changes its speed and wavelength when it passes through an opening, and It changes direction when it passes from one medium to another. Therefore, option A, C and D are correct.

An important case in which sound waves change form or spread out is called refraction. This phenomenon affects the bending of a sound wave owing to changes in the wave's speed.

Refraction is the reason ocean waves near a shore parallel to the beach and why glass lenses can be used to focus light waves.

If the air above the earth is warmed than that at the surface, sound will be change shape back downward toward the surface by refraction. Sound propagates in all directions from a point source.

Thus, option A, C and D are correct.

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Taking into account the reaction stoichiometry, 2.4041 grams of K₂O can be produced from 2 grams of K and 5 grams of O₂.

In first place, the balanced reaction is:

4 K + O₂ → 2 K₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.

To determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 32 grams of O₂ reacts with 156.4 grams of K, 5 grams of O₂ reacts with how much mass of K?

mass of K= (156.4 grams of K× 5 grams of O₂)÷ 32 grams of O₂

mass of K= 24.4375 grams

But 24.4375 grams of K are not available, 2 grams are available. Since you have less mass than you need to react with 5 grams of O₂, K will be the limiting reagent.

Considering the limiting reagent, the following rule of three can be applied: if by reaction stoichiometry 156.4 grams of K form 188 grams of K₂O, 2 grams of K form how much mass of K₂O?

mass of K₂O= (2 grams of K× 188 grams of K₂O)÷ 156.4 grams of K

mass of K₂O= 2.4041 grams

Then, 2.4041 grams of K₂O can be produced from 2 grams of K and 5 grams of O₂.

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Answer:

(Question) What does the Law of Conservation of Mass state?

(Answer) The total mass of all of the reactants prior to a chemical reaction must equal the total mass of all the products after the reaction.

(Question) If the mass of elements before a chemical reaction is 30 grams, after the chemical reaction, the mass will be __.

(Answer) 30 grams

(Question) 78 g of potassium (K) react with 71 g of chlorine (Cl) to produce potassium chloride. According to the Law of Conservation of Mass, what is the mass of the product (2KCl)?

(Answer) 149 g

(Question) 2 grams of potassium (K) reacts with 5 grams of Oxygen (O). According to the Law of Conservation of Mass, how many grams of potassium oxide (K2O) will be produced?

(Answer) 7

(Question) Which of the following equations demonstrates the Law of Conservation of Mass?

(Answer) CH4+O2→C+2H2O

Explanation:

just finished the quick check. hope this helps UwU

Answer:

Shearing commonly occurs along the edges of tectonic plates, although it may occur in other places as well. Most often it takes place between 10 and 20 kilometers beneath the earth's surface. If the same process occurred at the surface, it would result in fracturing and faulting.

Explanation:

Answer:

Now if u could give us all the questions u got right! lol 8

Explanation:

Answer:

is there an option for silver? if so, silver is the answer.

Answer:

The answer to this question is C; ultraviolet radiation

Explanation:

The the reason for this is because it carries more energy per photon than visible light does. Light travels at a speed of 299,792 kilometers per second (about 186,282 miles per second).

Answer:

a.the air has less thermal energy so that the temperature increases

The potential of a standard hydrogen electrode (SHE) can be calculated using the Nernst equation, that is : E(SHE) = E°(SHE) + (0.0592/n) * log([H₂]/[H⁺]).

Here, [H₂] is the concentration of hydrogen gas, [H⁺] is the concentration of hydrogen ions, E°(SHE) is the standard electrode potential of the SHE (which is 0 V), and n is the number of electrons transferred in the reaction.

Given [H₂] = 2.2 atm and [H⁺] = 0.84 M, and assuming n = 2, we can substitute these values into the Nernst equation to calculate E(SHE).

Hence,  potential of a standard hydrogen electrode (SHE) can be calculated using the Nernst equation as : E(SHE) = E°(SHE) + (0.0592/n) * log([H₂]/[H⁺]).

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Answer:

(simple differences)Biodegradable substances are those that degrades or break down naturally...

Non-biodegradable substances are those that do not degrades easily...

Answer:

Biodegradable substances are those that degrades or break down naturally

Non-biodegradable substances are those that do not degrades easily

Based on the average atomic mass, the abundance of isotope Tl-203 is 40.5%.

If we designate the abundance of Tl-203 as X and the abundance of Tl-205 as Y, we know the following:

X + Y = 1

203 * X + 205 * Y = 204.19

We can solve this in the following manner:

Y = 1 - X

203 * X + 205 * (1 - X) = 204.19

203 * X + 205 - 205 * X = 204.19

205 - 204.19 = 205 * X - 203 * X

0.81 = 2 * X

X = 0.81 / 2

X = 0.405

So the fraction of the lighter isotope (Tl-203) is 0.405 (or 40.5%).

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William's grandfather has dementia . They feed him, bathe him, and care for his daily needs. William and his family are serving as volunteer caregivers.

Dementia is a condition in which a person loses so much of their ability to think, remember, and reason that it makes it hard for them to do things they normally do. Certain individuals with dementia have no control over their feelings, and their characters might change.

Dementia is brought about by harm to synapses. The ability of brain cells to communicate with one another is disrupted as a result of this damage. At the point when synapses can't convey regularly, thinking, conduct and sentiments can be impacted.

There is at present no "fix" for dementia. In fact, there is unlikely to be a single treatment for dementia because it is caused by multiple diseases. Curing diseases that cause dementia, such as Alzheimer's, frontotemporal dementia, and dementia with Lewy bodies, is the goal of research.

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The number of neutrons reduces by one while the number of protons increases in the nucleus, the protons in the nucleus actually decrease by one, the nucleus's neutron count rises by one while the number of protons falls by one.

The center and most significant component of an atom is its nucleus. It is an extremely dense area near the core of an atom that is made up of neutral neutrons and positively charged protons.

(A) Neutron decay into protons and electrons is a necessary step in the emission of a beta particle. The electron that is released as the beta particle is not initially a component of the nucleus. As a result, the number of neutrons reduces by one while the number of protons increases in the nucleus.

(B) The creation of a neutron and positron from a proton occurs during the emission of a positron (b+). The beta positive particle, the positron, which is released, is not initially a component of the nucleus. Therefore, while there are one more neutrons and one less protons in the nucleus, the protons in the nucleus actually decrease by one.

(C) Electron capture refers to the process in which a proton in the nucleus pulls an electron out of the electron cloud. The proton and the caught electron combine to create a neutron. As a result, the nucleus's neutron count rises by one while the number of protons falls by one.

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Explanation:

[Ne] 3s² 3p⁵

Image result for What is the electron configuration of chlorine?

Atomic number: 17

Symbol: Cl

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Argon

Low pressure is usually located near the equator whereas high air pressure is usually located over the  North and South Poles.

Areas in low latitudes close to the equator are alluded to as the tropics. Sunlight hits the Earth’s surface there at a high angle. It is about a 90° point all year round. As a result, the tropics receive more sunlight per unit of surface range than other places on Earth. This causes the arrival, the water, and then the air at the equator to always be warm. At scopes close to the North Pole and the South Pole, sunlight strikes Earth’s surface at a low angle. Sunlight is spread over a larger surface region than within the tropics. This implies that the poles receive exceptionally small energy per unit of the surface zone and so they are cooler. Since that warm air rises and cold air sinks. Warm air is much less denser than cold air. Rising warm air puts less pressure on Earth than cooler air. Air pressure is ordinarily low over the tropics because it is as a rule warm there. Air pressure is as a rule high over colder zones such as the North and South Posts.

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Answer:

320.23g of CH3OH.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

CO(g) + 2H2(g)—> CH3OH(l)

Next, we shall determine the masses of CO and H2 that reacted and the mass of CH3OH produced from the balanced equation. This is illustrated below below:

Molar mass of CO = 12 + 16 = 28g/mol

Mass of CO from the balanced equation = 1 x 28 = 28g

Molar mass of H2 = 2x1 = 2g/mol

Mass of H2 from the balanced equation = 2 x 2= 4g

Molar mass of CH3OH = 12 + (3x1) + 16 + 1 = 32g/mol

Mass of CH3OH from the balanced equation = 1 x 32 = 32g

From the balanced equation above,

28g of CO reacted with 4g of H2 to produce 32g of CH3OH.

Next, we shall determine the the limiting reactant. This is illustrated below:

From the balanced equation above,

28g of CO reacted with 4g of H2.

280.2g of CO will react with =

(280.2 x 4)/28 = 40.03g of H2.

From the calculations made above, we can see that only 40.03g out of 50.5g of H2 is required to react completely with 280.2g of CO.

Therefore, CO is the limiting reactant and H2 is the excess reactant.

Finally, we shall determine the mass of methanol, CH3OH produced from the reaction.

In this case, the limiting reactant will be used because it will give the maximum yield of the reaction since all of it is used up in the reaction. The limiting reactant is CO and the mass of methanol, CH3OH produced can be obtained as follow:

From the balanced equation above,

28g of CO reacted to produce 32g of CH3OH.

Therefore, 280.2g of CO will react to produce = (280.2 x 32)/28 = 320.23g of CH3OH.

Therefore, 320.23g of CH3OH were produced from the reaction.

The cell that has a cell membrane, a nucleus, no chloroplast, and is eukaryotic is an animal cell. Animal cells are one of the major types of eukaryotic cells present in animals, humans, and other organisms.  

Eukaryotic cells are cells that contain a true nucleus enclosed by a nuclear membrane and various other membrane-bound organelles. They are much larger and more complex than prokaryotic cells, which do not have a true nucleus. Below are the characteristics of an animal cell:Cell membrane: A cell membrane is a semipermeable membrane that bthe cell, controls what enters and leaves the cell, and maintains the cell's shape and structure.

Nucleus: A nucleus is a membrane-bound organelle found in most eukaryotic cells that contain genetic material (DNA) that regulates the cell's activities.Chloroplast: Chloroplasts are organelles found in plant cells that contain chlorophyll and are responsible for photosynthesis. However, they are not present in animal cells. Eukaryotic: Eukaryotic cells are cells that contain a true nucleus enclosed by a nuclear membrane and various other membrane-bound organelles. They are much larger and more complex than prokaryotic cells, which do not have a true nucleus. An animal cell is a eukaryotic cell, making it different from prokaryotic cells. Therefore, an animal cell has a cell membrane, a nucleus, no chloroplast, and is eukaryotic.

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Answer:

1/3p0

Explanation:

The combined gas law:

P1V1/T1 = P2V2/T2, where P, V and T are Pressure, Volume, and Temperature.  Temperature must always be in Kelvin.  The subscriopts 1 and 2 are for initial (1) and final (2) conditions.

In this case, temperature is constant (adiabatically). V1 = 2.0L and V2 = 6.0L.  I'll assume P1 = p0.

Rearrange the combined gas law to solve for final pressure, P2:

P1V1/T1 = P2V2/T2

P2 = P1*(V1/V2)*(T2/T1)  [Note how I've arranged the volume and temoperature terms - as ratios.  This helps us understand what the impact of raising or lowering one on the variables will do to the system].

No enter the data:

P2 = P1*(V1/V2)*(T2/T1):  [Since T2 = T1, the (T2/T1) terms cancels to 1.]

P2 = p0*(2.0L/6.0L)*(1)

P2 = (1/3)p0

The final pressure is 1/3 the initial pressure.

Answer: Volcanoes and volcanic activity are responsible for the unusual ecosystems in the highlands.

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Explanation:

Answer:

the equation is balanced

Answer: The chemical term for the form of alcohol found in alcoholic beverages is ethanol, also known as ethyl alcohol or drinking alcohol. Ethanol is a clear, colorless liquid that is the primary ingredient in alcoholic beverages. It is a simple alcohol with the chemical formula C2H5OH, composed of two carbon atoms, six hydrogen atoms, and one oxygen atom. Ethanol is produced by the fermentation of sugars and carbohydrates in grains, fruits, and vegetables, and is also used as a solvent, fuel, and disinfectant.

Explanation:

AgI is less soluble in water than in a solution that contains CN⁻. The above statement is true.

The formation of the soluble complex ions is a vital reaction in the solubility of inorganic salts. The extent of the solubility of the inorganic salts depends on the reaction that leads to the formation of the complex. Many ions that cannot dissolve or are insoluble in water will dissolve in water if complexing agents are present. Cyanide ions CN⁻ can react with AgI in water to form a complex Ag(CN)₂⁻ that is soluble in water. Therefore, if AgI is added to the CN⁻ solution, it will dissolve quickly due to the formation of the soluble complex ion. The formation of the complex ion is essential in making a salt soluble in water.

The complex ion must be more stable than the salt ion it is replacing. Cyanide ions CN- can form a complex ion with AgI, but this complex is more stable than AgI in water.

Therefore, AgI is less soluble in water than in a solution that contains CN⁻.

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Complete statement.

AgI is less soluble in water than in a solution that contains CN⁻. True or false.