The total resistance in this circuit is

ohms.

The battery voltmeter should read

volts.

Answer:

B location A will experience water scarcity because plastic absorbs

Explanation:

Answer: I believe its D

Explanation:

Im doing the science test rn

Answer: It will move down

Explanation: Since there is an unbalanced force on the object its motion is directed on the side with the greatest amount of force.

Final answer:

With a net force of 5N downward, the object will accelerate downward.

Explanation:

If one force on an object is exerted 5N upward and another force is 10N downward, we can calculate the net force to determine the object's motion. By subtracting the upward force from the downward force, we get a net force of 10N - 5N = 5N downward. Since the net force is downward, the object will accelerate in the downward direction according to Newton's Second Law of Motion, assuming no other forces are acting on the object.

Answer:

Its c.

Explanation:

When the density and temperature at the core of the gravitationally collapsing nebula reaches values when nuclear fusion is triggered and sustained, that marks the birth of the star.

‘ you don’t likeee me dasss fineee kk byeee’

Answer:

B

Explanation:

Answer:1. A.   2.C    3.true

Explanation:

Answer:

d.electrons

Explanation:

Answer:

Sweating

Explanation:

When you sweat, you lose water that your body needs to function.

Sweating because running in a hot day you can sweat 3-4 liters of fluid per hour

The correct characteristics of medusae are: swim freely, have tentacles, mouths open downward.

Medusae are the free-swimming, jellyfish-like form of certain aquatic animals, typically found in the phylum Cnidaria. They are characterized by their ability to swim freely in the water, which distinguishes them from the sessile, or immobile, polyps that are another life stage of cnidarians. Medusae have tentacles that hang down from their bell-shaped bodies, which they use to capture prey. These tentacles are often equipped with stinging cells called nematocysts that help to immobilize their prey. The mouth of the medusa is located on the underside of the body, facing downward, and leads to a gastrovascular cavity where digestion takes place.

To summarize, the following are the characteristics of medusae:

- Swim freely: Medusae are capable of locomotion and can move through the water column.

- Have tentacles: They possess tentacles that extend from their bodies, which are used for capturing food.

- Mouths open downward: The mouth is situated on the ventral side of the medusa, facing downward, which is suitable for bringing captured prey into the gastrovascular cavity for digestion.

The other options listed do not accurately describe medusae:

- Are sessile: This is incorrect because medusae are free-swimming, not immobile.

- Lack tentacles: This is incorrect because tentacles are a defining feature of medusae.

- Mouths open upward: This is incorrect because the mouth of a medusa opens downward.

Answer:

3. V = 0.2673 L

4. V = 2.4314 L

5. V = 0.262 L

6. V = 2.224 L

Explanation:

3. assuming ideal gas:

∴ R = 0.082 atm.L/K.mol

∴ V1 = 225 L

∴ T1 = 175 K

∴ P1 = 150 KPa = 1.48038 atm

⇒ n = RT/PV

⇒ n = ((0.082 atm.L/K.mol)(175 K))/((1.48038 atm)(225 L))

⇒ n = 0.043 mol

∴ T2 = 112 K

∴ P2 = P1 = 150 KPa = 1.48038 atm

⇒ V2 = RT2n/P2

⇒ V2 = ((0.082 atm.L/K.mol)(112 K)(0.043 mol))/(1.48038 atm)

⇒ V2 = 0.2673 L

4. gas is heated at a constant pressure

∴ T1 = 180 K

∴ P = 1 atm

∴ V1 = 44.8 L

⇒ n = RT/PV

⇒ n = ((0.082 atm.L/K.mol)(180 K))/((1 atm)(44.8 L))

⇒ n = 0.3295 mol

∴ T2 = 90 K

⇒ V2 = RT2n/P

⇒ V2 = ((0.082 atm.L/K.mol)(90 K)(0.3295 mol))/(1 atm)

⇒ V2 = 2.4314 L

5.  V1 = 200 L

∴ P1 = 50 KPa = 0.4935 atm

∴ T1 = 271 K

⇒ n = RT/PV

⇒ n = ((0.082 atm.L/K.mol)(271 K))/((0.4935 atm)(200 L))

⇒ n = 0.2251 mol

∴ P2 = 100 Kpa = 0.9869 atm

∴ T2 = 14 K

⇒ V2 = RT2n/P2

⇒ V2 = ((0.082 atm.L/K.mol)(14 K)(0.2251 mol))/(0.9869 atm)

⇒ V2 = 0.262 L

6.a)  ∴ V1 = 24.6 L

∴ P1 = 10 atm

∴ T1 = 25°C = 298 K

⇒ n = RT/PV

⇒ n = ((0.082 atm.L/K.mol)(298 K))/((10 atm)(24.6 L))

⇒ n = 0.0993 mol

∴ T2 = 273 K

∴ P2 = 101.3 KPa = 0.9997 atm

⇒ V2 = RT2n/P2

⇒ V2 = ((0.082 atm.L/K.mol)(273 K)(0.0993 mol))/(0.9997 atm)

⇒ V2 = 2.224 L

The volume of a gas at different temperatures while keeping pressure constant can be calculated using Gay-Lussac's law. For the first question, we use the initial volume and temperature to find the final volume when the temperature changes to 112 K, while pressure remains constant.

The volume of a gas at different temperatures and pressures, while some variables are kept constant, can be calculated using the combined gas law when both temperature and pressure change, or Gay-Lussac's law when only temperature changes and pressure stays constant, or Boyle's law when only pressure changes and temperature stays constant.

For the first question: The initial conditions are a volume of 225 L at a temperature of 175 K, and we're asked to find the final volume at 112 K while keeping pressure constant.

Using Gay-Lussac's law: V1/T1 = V2/T2, we rearrange to solve for V2:

V2 = V1 * T2/T1

V2 = 225 L * 112 K/175 K

After performing the calculation, you find the new volume at 112 K.

Answer:

0.33M

Explanation:

Molarity is asking, in Laymens terms:

"If I took a litre of this stuff, how much stuff is gonna be in it?"

Diving deeper, we use litres instead of millilitres or nanolitres because that's usually what we're working with. We use moles rather than mass because mass varies; different substances have different molar masses, so describing something in g/L makes no sense if you're comparing two different solutions.

Anyway, go find the number of moles:

n=m/mm

n=27g/342.34g/mol

n=0.078870mol

The next question you've gotta ask yourself is:

What if I had a litre of it?

V = 0.2366L

M=n/V

M=0.078870mol/0.2366L

M=0.33M

The molarity of the Dr. Pepper made with imperial cane sugar is 0.334 M. This is calculated by first converting the mass of sugar into moles and the volume of water from mL to L, and then using these values in the molarity equation.

To calculate the molarity of a solution, we can use the formula: Molarity (M) = moles of solute/liters of solution. To apply this to your question, we first need to convert the mass of cane sugar (C12H22O11) into moles. The molecular weight of cane sugar (C12H22O11) is approximately 342.3 g/mol. Therefore, 27 g of sugar is approximately equal to 0.0789 moles.

Next, we need to convert the volume of water from mL to L. Hence, 236.6 mL is equal to 0.2366 L. Now, we can use these values in our molarity equation: M = 0.0789 moles/ 0.2366 L = 0.334 M. Therefore, the molarity of the Dr. Pepper made with imperial cane sugar is around 0.334 M.

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This is an example of "Skyscrapers".

Explanation:

Answer:

its sum about the engernier proces

Explanation:

just did i on apex

C. Tripling the length and reducing the radius by a factor of 2 is the change to a pipe would increase the conductance by a factor of 12.

Explanation:

As we know that the resistance is directly proportional to the length of the pipe and it is inversely proportional to the cross sectional area of the pipe.

So it is represented as,

R∝ l /A [ area is radius square]

So k is the proportionality constant used.

R = kl/A

Conductance is the inverse of resistance, so it is given as,

C= 1/R.

R₁ = kl₁ / A₁

R₂ = kl₂/A₂

R₂/R₁ = 1/12 [∵ conductance is the inverse of resistance]

        = l₂A₁ / l₁A₂

If we chose l₁/l₂= 3 and A₂/A₁= 4 So R₂/R₁= 1/3×4 = 1/12

So tripling the length and reducing the radius by a factor of 2 would increase the conductance by a factor of 12.

Answer:

Reducing the length by a factor of  1/3 and doubling the radius.

Explanation:

this is correct answer, my assignment says

The final pressure will be 405.3 kilopascals.

According to the Boyle's Law, the pressure of the gas is inversely proportional to the volume of the gas as the temperature of the gas remains constant.

So,PV = Constant.

Here in this question, the volume of the container is halved.

Let the Pressure of the gas initially be P1 and final pressure be P2. Volume of gas initially be V

So, according to Boyle's Law,

P₁V₁ = P₂V₂PP.

So, [tex]2 \times V[/tex] = P₂[tex]\frac V2[/tex].

So, P2 = 4 atm.

1atm = 101.325 kilo pascals.

So, 4 atm = [tex]4\times101.325[/tex] kilopascals. = 405.3 kilopascals.

Answer: Option D. There is no net change to the system.

Explanation:

chromium(VI) oxide

chromium(IV) oxide

chromium(IIl) oxide

chromium(ll) oxide

CrO-

CrO2-

CrO3-

Cr2O3-​

Answer:

A single quantity that measures the ionization energy of the valence electrons of an electron. Where a is number of electrons in s subshell and Is is Ionization energy of that subshell. AVEE measures two important qualities: 1.

Explanation:

Final answer:

The AVEE measures the average velocity (Vav) and displacement (Ax), which are essential in the context of work done by an electric force in a uniform electric field.

Explanation:

The AVEE, referring to the average electric potential energy, is used to measure two main quantities in physics: average velocity (Vav) and displacement (Ax). The average electric potential energy (AVEE) is involved when considering the work done by the electric force in moving a charge from one point to another, particularly in a uniform electric field. The concept of AVEE is essential in understanding how charges interact within an electric field. The equation AV = APE and APE = qAV help underline the relationship between the average electric potential energy and these measured quantities.

Answer:

                     127.15 °C

Explanation:

                    Gay-Lussac's law states that the pressure of a given mass of gas directly proportional to the absolute temperature of the gas at constant volume.

Mathematically,

                                           P₁ / T₁  =  P₂ / T₂   -----(1)

Data Given:

                  Initial Pressure  =  P₁  =  1 atm (assumed)

                  Initial Temperature  =  T₁  = -73°C =  200.15 K

                  Final Pressure  =  P₂  =  2 atm (doubled)

                  Final Temperature  =  T₂  =  ????

Solving equation 1 for T₂,

                                           T₂  =  P₂ × T₁ / P₁

Putting these values;

                                           T₂  =  2 atm × 200.15 K / 1 atm

                                           T₂  =  400.3 K

Or,

                                           T₂  =  127.15 °C

Conclusion:

                  By doubling the pressure results in increase in temperature.

The final temperature of the gas, when its pressure is doubled and volume held constant, increases from -73°C to 127°C.

To determine the final temperature of a gas when its pressure is doubled and volume remains constant, we use the Ideal Gas Law which can be expressed as PV = nRT.

Given the initial temperature (T1) is -73°C, which converts to 200 K (273 - 73), and the initial pressure (P1) is doubled to P₂= 2P₁, the formula becomes:

To find T₂ isolate T₂:

Thus, the final temperature of the gas in degrees Kelvin is 400 K.

To convert back to degrees Celsius, subtract 273:

The final temperature of the gas is 127°C.

Answer:

                        5.68 mol of CO₂

Explanation:

                    Mole is a chemical unit used to determine the amount of a substance also referred as chemical amount.  Also, it represents 6.022 × 10²³ of an entity. For example, 1 mole of Magnesium metals contains 6.022 × 10²³ atoms.

Mole is given as,

                                         Moles = Mass / M.Mass

This equation shows that when the mass of a substance is given then one can calculate its moles by dividing its mass by M.Mass or Atomic Mass.

As we know the M.Mass of CO₂ is 44.01 g/mol therefore, the moles are calculated as,

Moles  =  250 g / 44.01 g/mol

Moles  =  5.68 mol of CO₂

Answer: The number of moles of [tex]NaCl[/tex] produced will be, 3.61 moles.

Explanation : Given,

Mass of [tex]Na[/tex] = 83.0 g

Molar mass of [tex]Na[/tex] = 23 g/mol

First we have to calculate the moles of [tex]Na[/tex]

[tex]\text{Moles of }Na=\frac{\text{Given mass }Na}{\text{Molar mass }Na}[/tex]

[tex]\text{Moles of }Na=\frac{83.0g}{23g/mol}=3.61mol[/tex]

Now we have to calculate the moles of [tex]NaCl[/tex]

The balanced chemical equation is:

[tex]2Na+Cl_2\rightarrow 2NaCl[/tex]

From the reaction, we conclude that

As, 2 mole of [tex]Na[/tex] react to give 2 mole of [tex]NaCl[/tex]

So, 3.61 mole of [tex]Na[/tex] react to give 3.61 mole of [tex]NaCl[/tex]

Therefore, the number of moles of [tex]NaCl[/tex] produced will be, 3.61 moles.

Answer:

2.57

Explanation:

Answer:

                    Charge on Phosphate is -3 (PO₄³⁻)

Explanation:

                     Ions or polyatomic ions are formed when an atom or molecule loses or gains electron(s) respectively.

Example:

              Formation of ions.

                           Na  →  Na⁺  +  e⁻ (Na loses one electron)

                           Cl₂  +  2 e⁻  →  2 Cl⁻ (Cl gains electron)

In polyatomic ions a charge is present on a molecule which has either two or more atoms.

Example:

               CO₃²⁻ , SO₄⁻ , NH₄⁺ e.t.c.

In statement the  K₃PO₄ polyatomic ionic compound. It is made up of three K⁺ ions and one Phosphate ion (PO₄ˣ⁻) ion.

As we know K belongs to group 1 metals so it has one valence electron and thus, forms a cation of +1 charge. So, for a neutral polyatomic ionic compound the overall charge on K₃PO₄ should be zero. Hence,

                                         K (3) + PO₄ (X)  =  0

Or,

                                         +3 + X = 0

Or,

                                         X  =  0 - 3

                                         X  =  -3

Therefore, the charge on phosphate is -3.

The charge of phosphate in K3PO4 is -3.

The charge of phosphate in K3PO4 can be determined using the table provided. From the table, we can see that K+ has a charge of +1. Since there are three K+ ions in K3PO4, their total charge is +3. So, the charge of phosphate in K3PO4 is -3.

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The correct option is D.

The heat of vaporization is defined as the amount of heat needed to turn 1g of a liquid into a vapor, without a rise in the temperature of the liquid.

That is, water has a high heat of vaporization, the amount of energy needed to change one gram of a liquid substance to gas at a constant temperature. Water's heat of vaporization is around 540 cal/g at 100 °C, water's boiling point.

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Answer: 90 g O2

Explanation: soution attached:

Balance first the chemical equation

CH4 + O2 => CO2 +2H2O

Convert mass of CH4 to moles

Use the mole ratio of CH4 and O2 from the balanced equation.

Convert moles of O2 to mass using the molar mass of O2.

Answer:

Among the different types of scientific knowledge  hypotheses are likely to be modified or discarded most frequently. Long ago in the 1600's scientists discarded the phlogiston theory because the new evidence didnt support it.

Explanation:

Hypothesis is the assumption of something possible or impossible to draw a consequence and is provisionally established as the basis for an investigation and which can confirm or deny its validity. For this reason, within scientific research, hypotheses are so important and so changeable that they are modified or discarded more frequently within scientific knowledge.

Based on a work by Johann Joachim Becher, the German scientist Georg Ernst Stahl created the phlogiston theory that said combustion occurred with certain materials because they had an “element” or a common flammable principle that was released at the time of burning . This theory was abandoned because there was no evidence, even through scientific experiments, to prove that this theory is true.

Hypotheses are likely to be modified or discarded most frequently in scientific knowledge. Phlogiston theory was discarded due to evidence contradicting its predictions.

Among the different types of scientific knowledge, hypotheses are likely to be modified or discarded most frequently. Long ago, in the 1600s, scientists discarded the phlogiston theory because evidence contradicted the predictions made by the theory. Phlogiston theory proposed that a substance called phlogiston was released during combustion, but experiments showed that substances gained weight instead of losing weight during combustion.

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Answer:

Molality of the solution :  0.630 M

Mass of the KBr (solute) = x grams

Mass of the solvents : 86.0 - x grams

Mass of the solute = 6.001 grams

Mass of the solvent = 86.0 - x grams = 86.0 - 6.001 g = 79.999 grams

Explanation:

A 0.510m aqueous solution of KBr has a total mass of 67.0g. The masses of solute and solvent are 3.833g and 63.167 g.

The two main elements of a solution are a solute and a solvent. The solute is a substance that dissolves. The former dissolves in the solvent, which has that property. In other terms, the solvent is the dissolving media, and the solute is the stuff that is dissolved.

The solute, which is present in a solution in a smaller quantity than the solvent, is the substance that dissolves in the solvent. The term "solvent" refers to the substance that dissolves the solute in a solution; it is more abundant than the solvent.

Greater than the solvent is the boiling point. That is less than the solute's level.

Solute as a solid, liquid, or gas. Solvent is primarily liquid, but it can also be gaseous.

The qualities of the solute determine its solubility. The solvent's characteristics affect how something dissolves.

let the mass of solute be x g

mass of solvent= (67- x) g

Molality = [tex]\frac{x X 1000}{119(67-x)}[/tex]

solving for x:

x = 3.833g

67 - x = 63.167 g

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Answer:

The answer is D. H+ increases in solution.

Explanation:

One water molecule gains a hydrogen and therefore takes on a positive charge, while the other water molecule loses a hydrogen atom and therefore becomes negatively charged.

More information:

(https://www2.nau.edu/lrm22/lessons/acids_and_bases/acids_and_bases.html#:~:text=One%20water%20molecule%20gains%20a,and%20it%20makes%20things%20acidic.)

Answer:

Lead carbonate is not reacted with sulphuric acid in the formation of carbon dioxide because lead is insoluble in water. The reason is that lead is non polar substance and water is polar solvent means it makes positive and negative poles. Only polar solute dissolve in polar solvent and non polar solute dissolve in non polar solvent. So that's why lead carbonate do not dissolve in water and makes a layer on the water.

Explanation:

Answer: D

Explanation:

it says so on google

Answer:  pH = 7.36. The pKa of H2PO4− is 7.21.

Explanation:

The air pressure on the beach in Hawaii is greater than on top of Mauna Kea due to the greater altitude of Mauna Kea, which has less atmospheric mass above it exerting force. The atmospheric pressure is more substantial at sea level, where the complete atmosphere is overhead. Despite the large force exerted by air pressure when sunbathing on the beach, equal pressure inside the body allows one to easily stand up.

The air pressure on the beach in Hawaii is greater than the pressure on top of Mauna Kea due to differences in altitude. Atmospheric pressure decreases with altitude because the density of air molecules decreases as you go higher in the atmosphere; there are fewer air molecules above a given area exerting less force. At sea level, the pressure is at its highest because the full column of the atmosphere is above that point. In contrast, at the peak of Mauna Kea, which is 4.2 kilometers high, the column of air above it is significantly shorter, resulting in a lower pressure.

When lying on the beach sunbathing, the large force of atmospheric pressure, which is roughly equal to 10 tons, is exerted over the entire surface area of your body. However, because this pressure is exerted uniformly in all directions, your body's internal pressure, which is adjusted to the external atmospheric pressure, allows you to stand up without being crushed.