A solution contains 100 mg/mL of a drug, and the recommended dose is 50 mg/lb. once a day. How much solution would be needed for one dose to be administered to a 20 kg patient?


A. 2.2 L
B. 220 mL
C. 22 L
D. 22 mL

Answer: It is called an ion.

Explanation: When an atom has an unequal amount of protons and electrons, it can form an attraction with another.

More electrons- Negative ion (ANION)

More protons- Positive ion

Equal amount- Neutral

Good luck, hope this helps!

The answer is:

The new volume will be 1 L.

[tex]V_{2}=1L[/tex]

To solve the problem, since we are given the volume and the first and the second pressure, to calculate the new volume, we need to assume that the temperature is constant.

To solve this problem, we need to use Boyle's Law. Boyle's Law establishes when the temperature is kept constant, the pressure and the volume will be proportional.

Boyle's Law equation is:

[tex]P_{1}V_{1}=P_{2}V_{2}[/tex]

So, we are given the information:

[tex]V_{1}=2L\\P_{1}=50kPa\\P_{2}=100kPa[/tex]

Then, isolating the new volume and substituting into the equation, we have:

[tex]P_{1}V_{1}=P_{2}V_{2}[/tex]

[tex]V_{2}=\frac{P_{1}V_{1}}{P_{2}}[/tex]

[tex]V_{2}=\frac{50kPa*2L}{100kPa}=1L[/tex]

Hence, the new volume will be 1 L.

[tex]V_{2}=1L[/tex]

Have a nice day!

Answer:

0.21 M. (2 sig. fig.)

Explanation:

The molarity of a solution is the number of moles of the solute in each liter of the solution. The unit for molarity is M. One M equals to one mole per liter.

How many moles of NaOH in the original solution?

[tex]n = c \cdot V[/tex],

where

[tex]n = c\cdot V = 0.25\;\text{mol}\cdot\textbf{L}^{-1} \times 0.135\;\textbf{L} = 0.03375\;\text{mol}[/tex].

What's the concentration of the diluted solution?

[tex]\displaystyle c = \frac{n}{V}[/tex].

Concentration of the diluted solution:

[tex]\displaystyle c = \frac{n}{V} = \frac{0.03375\;\text{mol}}{0.160\;\textbf{L}} = 0.021\;\text{mol}\cdot\textbf{L}^{-1} = 0.021\;\text{M}[/tex].

The least significant number in the question comes with 2 sig. fig. Keep more sig. fig. than that in calculations but round the final result to 2 sig. fig. Hence the result: 0.021 M.

Answeri think 0.21 M

Explanation:

Answer:

up quark

Explanation:

Answer:

up quark

Explanation:

Answer:

The temperature.

Explanation:

Temperature and kinetic energy are equally proportional.

D. Temperature is the factor based upon which the average kinetic energy of the substance depends upon.

The kinetic theory of gases depicts a gas as countless submicroscopic particles, which are all in steady, fast, arbitrary movement. The haphazardness emerges from the particles' numerous crashes with one another and with the dividers of the holder.  

This theory of gases clarifies the perceptible properties of gases, for example, weight, temperature, thickness, warm conductivity, and volume, by thinking about their atomic synthesis and movement. The hypothesis places that gas weight results from particles' crashes with the dividers of a compartment at various speeds.  

The velocity of the argon atoms has been 414.6155 m/s.

The average velocity of the atom has been the speed possessed by the atom at the certain temperature.

The average velocity of the gas has been given by:

[tex]v=\sqrt{\dfrac{3nRT}{m} }[/tex]

The moles of argon have been, [tex]n=1[/tex]

The Boltzmann constant has been, [tex]R=8.31\;\rm J/mol.K[/tex]

The temperature of gas has been, [tex]T=275\;\rm K[/tex]

The mass of the gas has bee, [tex]m=0.0399\;\rm kg[/tex]

Substitute the values for the velocity, v, of argon atoms as:

[tex]v=\sqrt{\dfrac{3\;\times\;1\;\;\times\;8.13\;\times\; 275}{0.0399} }\\v= \sqrt{171,906.015}\\v= 414.6155\;\rm m/s[/tex]

The velocity of the argon atoms has been 414.6155 m/s.

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The average velocity of argon atoms in a specific condition using a given formula.Therefore 488 m/s is correct.

The average velocity of atoms in 1.00 mol of argon at 275 K can be calculated using the formula:

v_avg = √(8 * k * T / (π * m))

Plugging in the values, we find the average velocity to be approximately 488 m/s.

Answer & Explanation:

Answer:

The material that would most likely slow the flow of electricity is plastic.

Explanation:

Plastic is a conductor. A conductor is something that stop or slows down the flow of electricity.

D. Red and Violet are reflected, Green is absorbed

Leaves of plants are green because chlorophyll pigments absorb red and blue light and reflect green light. The correct answer is B - red and blue are absorbed, and green is reflected.

The color absorbed and reflected by the leaves of most plants can be understood by examining the pigments chlorophyll a and chlorophyll b, which absorb light for photosynthesis. Chlorophyll a absorbs light primarily in the blue-violet and red regions, and chlorophyll b absorbs red-blue light. Both pigments reflect green light, which is why leaves appear green to us. Addition to this, there are carotenoids that absorb light in the blue-green and violet region and reflect longer yellow, red, and orange wavelengths.

The correct answer to the question is B. Red and blue are absorbed; green is reflected. This is because chlorophyll a and b absorb light at blue and red wavelengths, which are essential for photosynthesis, and reflect the green wavelengths that they do not absorb.

Ethanol is the correct answer as it can dissolve both polar and nonpolar solutes due to its polar -OH group and a nonpolar ethyl group.

Among these, ethanol is the solvent that can dissolve both polar and nonpolar substances. Water is a polar solvent and typically dissolves polar or ionic solutes like methanol (CH3OH) and sodium sulfate (Na2SO4), but not nonpolar solutes like octane (C8H18). On the other hand, nonpolar solvents like toluene and hydrocarbon such as heptane (C7H16) would dissolve nonpolar substances like octane (C8H18), but not polar solutes. Ethanol's unique properties allow it to dissolve wide-ranging solutes because it contains a polar -OH group and a nonpolar ethyl group (C2H5-), making it suitable for both polar and nonpolar solutes.

Answer:

Returning passengers back safely to Earth

Explanation:

Answer:

ummmm have no clue

Explanation:

Answer:

Glucose

Explanation:

There are two types of respiration:

1. Aerobic respiration  

2. Anaerobic respiration

Aerobic respiration

It is the breakdown of glucose molecule in the presence of oxygen to yield large amount of energy. Water and carbon dioxide are also produced as a byproduct.

Glucose + oxygen → carbon dioxide + water + 38ATP

Anaerobic Respiration

It is the breakdown of glucose molecule in the absence of oxygen and produce small amount of energy. Alcohol or lactic acid and carbon dioxide are also produced as byproducts.  

Glucose→ lactic acid/alcohol + 2ATP + carbon dioxide

This process use respiratory electron transport chain as electron acceptor instead of oxygen. It is mostly occur in prokaryotes. Its main advantage is that it produce energy (ATP) very quickly as compared to aerobic respiration.  

Steps involve in anaerobic respiration are:

Glycolysis

Glycolysis is the first step of both aerobic and anaerobic respiration. It involve the breakdown of one glucose molecule into pyruvate and 2ATP.

Fermentation

The second step of anaerobic respiration is fermentation. It involve the fermentation of pyruvate into lactic acid or alcohol depending upon the organism in which it is taking place. There is no ATP produced in this step, however carbon dioxide is released.

What he said^

Ninja in resting pose

   -_-

-  I   I-

<       >

-Mr. Anon

Using hydrogen peroxide to bleach hair is affordable and can give great results but only if used well. The following steps will help you bleach your hair safely with hydrogen peroxide: ... Shampoo, rinse and dry your hair. Apply the conditioner; let it stay for a few minutes before you comb it through.

Answer:

1. It's affordable

2. You can control the color

3. You'll be popular (at least in my school you will)

4. It can ruin your hair

5. Spillage on your skin

6. I don't think it's toxic

Explanation:

This is all I can come up with. If I'm able to think of more, I'll edit this.

Answer:

[tex]\boxed{ \text{A double displacement reaction} }[/tex]

Explanation:

In a double displacement reaction, the metal cations change partners with the anions.

3Na₂CO₃(aq)  + 2AlCl₃(aq) ⟶ 6NaCl(aq) + Al₂(CO₃)₃(s)

This is also a precipitation reaction, because the aluminium carbonate is insoluble and precipitates from solution.

Answer: Solid and liquid

Explanation:

An aerosol is a suspension of fine solid particles or liquid droplets, in air or another gas.[1] Aerosols can be natural or anthropogenic. Examples of natural aerosols are fog, dust, forest exudates and geyser steam. Examples of anthropogenic aerosols are haze, particulate air pollutants and smoke.[dubious – discuss][1] The liquid or solid particles have diameters typically <1 μm; larger particles with a significant settling speed make the mixture a suspension, but the distinction is not clear-cut. In general conversation, aerosol usually refers to an aerosol spray that delivers a consumer product from a can or similar container. Other technological applications of aerosols include dispersal of pesticides, medical treatment of respiratory illnesses, and convincing technology.[2] Diseases can also spread by means of small droplets in the breath, also called aerosols (or sometimes bioaerosols).[3]

Aerosol science covers generation and removal of aerosols, technological application of aerosols, effects of aerosols on the environment and people, and other topics.

Aerosols, the atmospheric particles, consist of: D. Solid and liquid

Suspension is a heterogeneous mixture where the solute particles get suspended throughout the bulk of the solvent, then left floating around freely in the medium.

An aerosol is a suspension of fine solid particles or liquid droplets and it is in air or another gas. An aerosol is a gas containing very small particles of a solid or liquid with particle diameters in the range of [tex]10^-9[/tex] to [tex]10^-4[/tex]m.

Aerosols are come from volcanoes, dust storms, fires, vegetation, sea spray, burning of fossil fuels and land use. Primary aerosols are those particles emitted directly into the atmosphere. It is because the different sources of aerosols mix on the earth's surface. Warming aerosols are include black carbon and dark soot. Cooling aerosols include dust, sulfate particles and sea spray.

Aerosols can influence the Earth's climate in two ways. When the sky is clear (devoid of clouds), aerosols can reflect incoming sunlight back to outer space

Therefore aerosols, the atmospheric particles, consist of: Solid and liquid.

Grade:  9

Subject:  chemistry

Chapter:  aerosols

Keywords:   Aerosols, Solid, liquid, Water, the atmospheric particles

Answer:

The second choice, or flammability.

Explanation:

The flammability of something is how easy it is for it to burn or ignite.

Answer:

The Answer in flammability

Explanation:

Both fire and the fire starter are chemicals therefore its B.

Answer:

First ionization of lithium:

[tex]\text{Li}\;(g)\to \text{Li}^{+} \; (g) + \text{e}^{-}[/tex].

Second ionization of lithium:

[tex]\text{Li}^{+}\;(g) \to\text{Li}^{2+} \;(g) + \text{e}^{-}[/tex].

Explanation:

The ionization energy of an element is the energy required to remove the outermost electron from an atom or ion of the element in gaseous state. (Refer to your textbook for a more precise definition.) Some features of the equation:

First Ionization Energy of Li:

Second Ionization Energy of Li:

The first ionization energy of lithium is represented by the equation: Li(g) -> Li+(g) + e-, with an energy of +54.4 eV. The second ionization energy is represented by the equation: Li+(g) -> Li2+(g) + e-, with an energy of 30.6 eV. These equations demonstrate the process of ionization.

The ionization energy of an element is the energy required to remove an electron from a gaseous atom or ion. The first ionization energy of lithium is represented by the equation: Li(g) -> Li+(g) + e-, the energy required for this process is +54.4 eV.

The second ionization energy refers to the energy required to remove the second electron. For lithium, the second ionization energy is represented by the equation: Li+(g) -> Li2+(g) + e-, the energy needed for ionizing the second electron is 30.6 eV.

The equations represent the processes which occur when the first ionization and the second ionization energies of lithium are measured.

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Answer:

Position D

Explanation:

One fourth of the Moon will be visible from Earth when the Moon is in position D. The reason why this is the right position is that the Moon will be in a position where the majority of its surface that is lighted by the Sun is facing the Sun. On the other hand, the angle is just right that about one quarter of the lighted part of the Moon is also facing the Earth. This will result in a perception from the Earth's view point that the Moon is lighted at one quarter of its surface.

Answer:

The missing coefficient is 2

Neutralization

Explanation:

Mg(OH)₂ + H₂SO₄ ⟶ MgSO₄ + _____H₂O

Let us use alphabets a,b, c and d to represent the coefficients of the compounds in the given equation:

aMg(OH)₂ + bH₂SO₄ ⟶ cMgSO₄ + ___d__H₂O

In balancing chemical equations, we must bear in mind that they must obey the law of conservation of mass. We can use two approach in balancing a reaction.

We can inspect the individual atoms to check if they are balanced. We can also do this by using a simple mathematical method.

For the given reaction:

                        aMg(OH)₂ + bH₂SO₄ ⟶ cMgSO₄ + ___d__H₂O

For Mg:

          a = c                                (i)

For O:

        2a + 4b = 4c + d                (ii)

For H:

       2a + 2b =  2d                       (iii)

For S:

         b = c                                   (iv)

If a = 1, then c = 1, b = 1

we can then use either equation (ii) or (iii) to solve for the unknown "d":

         2a + 4b = 4c + d

Making the d the subject of the equation:

        d = 2a + 4b - 4c

        d = 2(1) + 4(1) - 4(1)

        d = 2 + 4 - 4

        d = 2

The missing coefficient is 2 and the complete equation is given as:

                       Mg(OH)₂ + H₂SO₄ ⟶ MgSO₄ + 2H₂O

The reaction is a neutralization process. In neutralization, an acid and a base react together to produce salt and water. As we can see, Mg(OH)₂ combines with H₂SO₄ to produce salt and water.

The balanced equation is Mg(OH)₂ + H₂SO₄ ⟶ MgSO₄ + 2H₂O. The reaction is a neutralization reaction. Therefore, the correct option is option B.

An equation per a chemical reaction is said to be balanced if both the reactants or the products have the same number of atoms and total charge for each component of the reaction. In other words, each side of the reaction have an equal balance of mass and charge. It is typical to balance chemical formulas for both mass plus charge in aqueous solutions. Equal numbers and types of atoms are produced on both halves of the equation when balancing for mass.

aMg(OH)₂ + bH₂SO₄ ⟶ cMgSO₄ + dH₂O

For Mg

a = c                              

For O

2a + 4b = 4c + d    

For H

2a + 2b =  2d    

For S

b = c        

If a = 1, then c = 1, b = 1

2a + 4b = 4c + d

d = 2a + 4b - 4c

d = 2(1) + 4(1) - 4(1)

d = 2 + 4 - 4

d = 2

the balanced equation is Mg(OH)₂ + H₂SO₄ ⟶ MgSO₄ + 2H₂O

The reaction is a neutralization reaction

Therefore, the correct option is option B.

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Answer:  B.  Tornado

Explanation:  A tornado is a violent rotating column of air extending from a thunderstorm to the ground. The most violent tornadoes are capable of tremendous destruction with wind speeds of up to 300 mph. They can destroy large buildings, uproot trees and hurl vehicles hundreds of yards. They can also drive straw into trees.

Severe weather that doesn't serve as intense tropical storm is B:

tornado.

Therefore, option B is correct.

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Answer:

1. Evaporation

2. Condensation

3. Precipitation

4. Runoff

Explanation:

The water cycle shows how water moves on the earth as it passes through different phases.

Water on land is stored in oceans, rivers and other water bodies. This water coupled with those in plants and animals are turned into vapor through EVAPORATION. Evaporation facilitates the movement of water on the surface into the atmosphere.

In the atmosphere, the vapor condenses on dust particles found up there. The vapors forms a nuclei around the dust particles and water condenses at the saturated vapor pressure. This forms cloud.

As the water collects more and more, gravity forces the water to fall in form of PRECIPITATION. The precipitation can be in form of snow or rainfall.

When precipitation occurs, they move on the surface as SURFACE RUNOFFS. Some of the runoff goes back into oceans and rivers. Others infiltrates into the ground and collects in the ground water pool under the subsurface. Subsurface water can also get into into other water bodies when the water table coincides with the steam level.

The water in these bodies can then go into the cycle again. The sun is the source of energy for this process.

The water cycle consists of four main steps including evaporation/sublimation, condensation/precipitation, subsurface water flow, and surface runoff/snowmelt, representing a continuous movement of water on, above, and below the surface of the Earth.

According to the water cycle diagram: 1 corresponds to evaporation/sublimation, where water from the oceans turns into water vapor, due to the sun's energy. 2 represents condensation or precipitation, which takes place when the water vapor cools down and forms clouds, eventually falling as rain or snow. 3 stands for subsurface water flow - the movement of water underground, within the soil, which occurs after the water infiltrates the soil. Lastly, 4 is related to surface runoff/snowmelt - when excess water from rain, meltwater, or other sources flows on the Earth's surface and returns to the oceans completing the cycle.

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Answer:

Explanation: so a combustion occurs when we react a substance with oxygen .you commonly call this "burning'' .therefore combustion will always include oxygen in the equation and the product will include carbon dioxide and give off water vapours

Therefore the general equation for a complete combustion reaction would be

Fuel + O2 ------ CO2 + H2O

I'm not sure if this is the right one because there are 3 choices haha...

So it's either

1. Sound

2. Mechanical

3. Low frequency

Answer:

K = 9.4 *10^5

The reaction favor product formation

Explanation:

Equilibrium constant of a chemical reaction is the value of its reaction quotient at chemical equilibrium. Also it is defined as the ratio of the product of concentration of products to the product of concentration of reactants each term raised to power equal their stochiometric coefficients.  

so, for the reaction,

The equilibrium constant can be expressed as following:

[tex]K_{eq}=\frac{[H_2S]^2}{H_2]^2\times [S_2]}[/tex]

where  concentration of reactants and products is expressed in molarity Molarity=(no of moles/ Volume L)

So,

[H₂] = (0.50 mol / 1 L) = 0.50 M

[S₂] = (0.02 mol / 1 L) = 0.020 M

[H₂S] = (68.5 mol / 1 L) = 68.5 M

∴ K_{eq}=\frac{[68.5]^2}{0.50]^2\times [0.020]}=9.4*10^5

As the value of K is greater than 1, the reaction favor product formation.

Answer:

No, it is not balanced.

The balanced equation is: Zn(OH)₂ + 2NaOH → Na₂ZnO₂ + 2H₂O.

Explanation:

The no. of Na atoms in reactants side is 1 but in products side is 2.

The no. of H atoms in reactants side is 3 but in product side is 2.

So, the equation is not balanced.

Zn(OH)₂ + 2NaOH → Na₂ZnO₂ + 2H₂O.

Zn (1), O (4), H (4), and Na (2).

Carbon–oxygen bond. A carbon–oxygen bond is a polar covalent bond between carbon and oxygen. Oxygen has 6 valence electrons and prefers to either share two electrons in bonding with carbon, leaving the 4 nonbonding electrons in 2 lone pairs :O: or to share two pairs of electrons to form the carbonyl functional group.

The type of bond that forms between carbon and oxygen is a covalent bond.

Covalent bonding involves the sharing of electrons between atoms. In the case of carbon and oxygen, both atoms can achieve a more stable electron configuration by sharing electrons.

Carbon has four valence electrons, and oxygen has six valence electrons. When carbon and oxygen atoms come together, they can share two electrons to form a double bond.

In this arrangement, carbon shares two electrons with oxygen, and oxygen shares two electrons with carbon. This sharing of electrons allows both atoms to achieve a full outer electron shell, satisfying the octet rule.

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Answer:

Kelvin

Explanation:

Final answer:

Charles's law requires temperatures to be in Kelvin, the absolute temperature scale, to accurately describe the relationship between a gas's volume and its temperature at constant pressure.

Explanation:

This gas law works only if the temperature is recorded in Kelvin units. Specifically, the gas law referred to here is Charles's law, which establishes a direct relationship between the volume of a gas and its temperature, given constant pressure and amount of gas. Kelvin is the absolute temperature scale used in this context because it starts at absolute zero, the theoretical point at which a gas would have no volume. To convert Celsius to Kelvin, the formula K = °C + 273 is used, ensuring that temperatures are in the appropriate scale for these calculations. Charles's law, along with others like Boyle's law, forms the foundation of our understanding of gas behavior under various conditions.

Answer:

0.98 g of H₂

Explanation:

the balanced equation for the reaction is

Mg + 2HCl ---> MgCl₂ + H₂

molar ratio of Mg to H₂ is 1:1

number of Mg moles reacted = 12 g/ 24.3 g/mol = 0.49 mol

according to molar ratio

when 1 mol of Mg reacts 1 mol of H₂ is formed

therefore when 0.49 mol of Mg reacts - 0.49 mol of H₂ forms

therefore mass of H₂ formed = 0.49 mol x 2 g/mol = 0.98 g

mass of H₂ formed is 0.98 g

Approximately 0.988 grams of H2 will be produced from 12 grams of Mg according to the equation provided. This is calculated by first converting the mass of Mg to moles, then using the stoichiometric relationship to find the moles of H2, and finally converting moles of H2 back to grams.

To solve this problem, you need to know that in the balanced chemical equation, the coefficients of the reactants and the products represent the mole ratios in which they react and form. In the provided equation, 'Mg + 2HCl → MgCl2 + H2', there is a 1:1 ratio between Mg and H2. So, we first convert grams of Mg into moles using its molar mass. The molar mass of Mg is approximately 24.305 grams per mole. Therefore, the amount of moles of Mg we have is 12g (amount given) divided by 24.305g/mol (molar mass of Mg) which is approximately 0.494 moles of Mg.

Since Mg and H2 are in a 1:1 ratio, we also have approximately 0.494 moles of H2. To convert the moles of H2 to grams, we multiply by its molar mass (about 2 grams per mole). So, the mass of H2 produced is 0.494 moles times 2g/mol which equals approximately 0.988 grams of H2.

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Answer:

question 1:

The right choice is  → c. KNO₃

question 2:

The right choice is  → c. 784 mm Hg

Explanation:

===============================================================

question 1:

From the figure, the solubility of the different salts at 90 °C is:

NaCl:

It is 40 g per 100 g water.

KBr:

It is 100 g per 100 g water.

KNO₃:

It is about 240 g per 100 g water.

NaClO₃:

It is about 220 g per 100 g water.

∴ The most soluble salt in water at 90°C is KNO₃.

So, the right choice is

→ c. KNO₃

===============================================================

question 2:

We can use the general law of ideal gas: PV = nRT.

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R is the general gas constant,

T is the temperature of the gas in K.

If n and T are constant, and have two different values of P and V:

P₁ * V₁= P₂ * V₂

from the given data :

P₁ = 3060 mm Hg

V₁ = 0.520 L.

V₂ = 2.03 L.

∴ P₂ = [P₁ * V₁] / V₂ = [3060 mm Hg  * 0.520 L] / 2.03 L = 783.84 mm Hg

      ≅ 784 mm Hg

So, the right choice is

→ c. 784 mm Hg

===============================================================