( SCIENCE ! ) In 3–5 sentences, explain the reasons for the differences in daylight and darkness at the North Pole and South Pole on the December solstice.

Answer:

Boron and/or Polonium

Explanation:

In the periodic table, you can see a stair-stepped line starting at Boron (B), atomic number 5, and going all the way down to Polonium (Po), atomic number 84. Except for Germanium (Ge) and Antimony (Sb), all the elements to the left of that line can be classified as metals.

The four pieces of the safety equipment present in each lab is the lab coats, the safety glasses, the disposable gloves, and the eyewash stations.

The four of important safety equipment should be present in the lab are as follows :

These are the safety equipment must be available in each of the lab. The Chemical spill kits contain the special absorbents , that is used to clean the chemicals and the other items for the cleaning up the chemical spills. We should properly clean our hand after the handling the chemicals.

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FiO2 (Fraction of Inspired Oxygen) in the toxic or danger zone is considered above 0.5 or 50%.

FiO2 is the concentration of oxygen that a patient inhales. FiO2 less than 0.21 (21%) is considered room air, and FiO2 more than 0.5 or 50% is considered toxic or dangerous. Oxygen toxicity happens when there's excessive oxygen concentration in the lungs. Oxygen at high concentrations can produce harmful reactive oxygen species that can damage the alveolar-capillary membrane and lead to inflammation and oxidative stress.

Although the use of high FiO2 may be necessary for certain medical conditions, such as respiratory failure or sepsis, the benefits must always be weighed against the potential risks of oxygen toxicity. This is why clinicians monitor oxygen levels and titrate FiO2 to maintain appropriate oxygenation while avoiding toxicity.

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Answer:

answer down here

Explanation:

At the most basic level, all organisms are made of a combination of elements. They contain atoms that combine together to form molecules. In multicellular organisms, such as animals, molecules can interact to form cells that combine to form tissues, which make up organs. ... Often, these atoms combine to form molecules.

Answer:

Well, he needs to take one more electron to have a stable structure. And by doing that the atom will have more electrons than protons and will turn into a negative ion.

Answer:

Hope this helps!

Explanation:

The mass of water H₂O that would be produced from the reaction is 43.2 g

The number of mole can be obtained as by using the ideal gas equation as illustrated below:

n = PV / RT

n = (1.3 × 20) / (0.0821 × 263)

n = 1.2 mole

Balanced equation

2H₂ + O₂ → 2H₂O

From the balanced equation above,

1 mole of O₂ reacted to produce 2 moles of H₂O.

Therefore,

1.2 mole of O₂ will react to produce = 1.2 × 2 = 2.4 moles of H₂O

Mass = mole × molar mass

Mass of H₂O = 2.4 × 18

Mass of H₂O = 43.2 g

Thus, 43.2 g of water were produced from the reaction.

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Answer:

15.6g ofH2O

Explanation:

The answer to your question is:

The definition of the standard atmosphere's unit of pressure is 101325 Pa. It is occasionally used as a standard pressure or a reference pressure. It roughly corresponds to the average atmospheric pressure at sea level on Earth.

Psi: means "Pounds of force per Square Inch of area " an is a unit of pressure.

Atm: means atmosphere and is a unit of pressure defined as 101325 Pa.

kPa: is defined as the force of 1 Newton applied over one square meter.

     ( 101325 Pa = 101.3 kPa)

Then

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The mole fraction of benzoic acid in the solution is 0.855.

What is benzoic acid?

Benzoic acid is a white solid which is a carboxylic acid based on benzene.

The vapor pressure of the benzoic acid solution and the mole fraction of the solute are directly proportional to each other i.e.

Pt = x P°s

Here t = total pressure

s = solvent

Given:

Vapor pressure of diethyl ether = 400.0 torr

Vapor pressure of the solution = 342 torr

Now substituting the values in the formula

342 =   x 400

= 342 / 400

 = 0.855

Thus, the mole fraction of benzoic acid is 0.855

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Answer:

B

Explanation:

Oxidation occurs when an atom molecule or ion loses one or more electrons in a chemical reaction when oxidation occurs the oxidation state of the chemical species increases oxidation doesn't necessarily involve oxygen originally the term was used when oxygen caused electron loss in a reaction hope this helped. :)

An element is oxidized when It has loses one or more electrons in a chemical reaction. Therefore, Option (C) is correct.

The loss of electrons, gain of oxygen or loss of hydrogen will be considered as Oxidation.

The gain of electrons, loss of oxygen or gain or hydrogen will be considered as the Reduction.

Rusting is one of the popular example of oxidation.

Therefore, An element is said to be oxidized when It has lost one or more electrons in a reaction.

Hence , Option (C) is correct.

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Answer: The correct answer is 4.956 * 10^7.

Explanation:

For Electrostatic force,

Given qA =1.2 × 10∧-6 C (Since 1 micron = 10∧-6)

qB=0.92 ×10∧-6 C Since 1 micron = 10∧-6)

r = 4.8m

Electrostatic force = (K×qA×qB)÷r∧2 where K is Coulomb's constant or electrostatic constant =8.98755×10∧9

Therefore Electrostatic energy =(8.98755×10∧9×1.2×0.92×10∧-12)÷4.8∧2

                                                   =0.00043065 N ················ eq1

Now for Gravitational force,

mA=2Kg ,mB=1.5Kg ,r=4.8m,G is Gravitational constant =6.67408 × 10-11 N m2 kg-2

Gravitational force=(G×mA×mB)÷r∧-2

                               =(6.67408 × 10-11 ×2×1.5)÷4.8∧-2

                                 =0.869021875 ×10∧-11 N...............eq2

Ratio of electric and gravitational force between ‘A’ and ‘B’ = eq1÷eq2

                                                                                 =49555714.5785

Electrostatic force occurs due to interaction either between like charges that is either between positive-positive or negative negative charges or between unlike charges like positive-negative. Its strength  depends on the charges and the distance between the charges which decreases as the distance increases.

Gravitational  force occurs due to the fact every particle attracts each and every other particle in the universe. Its strength  depends on the mass  and the distance between the particles which decreases as the distance increases.

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Heat, hydrogen gas, and the corresponding metal hydroxide are produced when alkali metals and water react. This reaction's heat could set fire to the hydrogen or the metal itself, causing an explosion or fire. With water, the heavier alkali metals will react more violently.

In unadulterated water, the particles lose one hydrogen from the H2O structure, in a cycle called separation. As a result, there are only a few hydrogen ions (H+) and residual hydroxyl ions (OH-) in the water. The constant formation and dissociation of a small number of water molecules are in equilibrium.

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Because it requires more energy to create a neutron from a proton than it does to create a proton from a neutron, protons were formed more frequently than neutrons in the early universe. The correct answer is option b.

To find the answer, we need to know more about the early universe.

Thus, we can conclude that, the correct answer is option b.

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Answer:

D- 0.100L

Explanation:

Answer:

hello :3

A cold is a contagious upper respiratory infection that affects your nose, throat, sinuses and trachea (windpipe).

Explanation:

have a nice day :3

There is 1.0 mole of KNO₃ in 500.0 mL of a 2.0 M KNO₃ solution.

To determine the number of moles of KNO₃ in 500.0 mL of a 2.0 M KNO₃ solution, we need to use the equation:

moles = concentration (M) × volume (L)

Since 1 liter is equal to 1000 milliliters, we divide 500.0 mL by 1000 to get 0.5 L.

Next, we substitute the values into the equation:

moles = 2.0 M × 0.5 L

The concentration of 2.0 M indicates that there are 2.0 moles of KNO₃ in 1 liter of the solution. Therefore, multiplying the concentration (2.0 M) by the volume (0.5 L) gives us the number of moles of KNO₃:

moles = 2.0 M × 0.5 L = 1.0 mol

Hence, there is 1.0 mole of KNO3 in 500.0 mL of a 2.0 M KNO₃ solution.

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A potassium atom's ground state electron configuration is 1s2, 2s2, 2p6, 3s2, 3p6, 4s1.

An atom's electron configuration is a picture of how electrons are arranged in relation to orbital shells and subshells. Consequently, this is potassium's electron configuration.

Making Electron Configurations in Writing. Write the energy level (the period) first, then the subshell that needs to be filled, and finally the superscript, which indicates how many electrons are in that subshell. The atomic number, Z, is the sum of all the electrons.

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Answer: that is the answer

Explanation:

a) To solve for the k value in the equation T(t) = 70 + 142ekt, we can use the given information that the coffee temperature at 10 minutes was 110°F.

Substituting t = 10 and T(t) = 110 into the equation, we have:110 = 70 + 142ek(10). Subtracting 70 from both sides, we get: 40 = 142ek(10). Dividing both sides by 142, we have: ek(10) = 40/142. Taking the natural logarithm (ln) of both sides, we get: ln(ek(10)) = ln(40/142). Simplifying, we have: k(10) = ln(40/142). Dividing both sides by 10, we get: k = ln(40/142) / 10. Using a calculator, we find that k ≈ -0.0131. b) To find T(t) at 19.5 minutes, we can substitute t = 19.5 into the equation T(t) = 70 + 142ekt: T(19.5) = 70 + 142e(-0.0131)(19.5) Using a calculator, we can evaluate the expression to find T(19.5) ≈ 99.6°F. a) The decay of Lidocaine can be modeled using the equation L(t) = aekt. Given that the half-life of Lidocaine is about 1.5 hours, we can use this information to solve for the k value. Using the half-life formula, we know that: t1/2 = (ln 2) / k. Substituting t1/2 = 1.5 hours, we have: 1.5 = (ln 2) / k. Solving for k, we get: k = (ln 2) / 1.5. Using a calculator, we find that k ≈ 0.4621. b) The exponential model for Lidocaine decay is given by : L(t) = aekt. c) To find how long it will take for the amount of Lidocaine to reduce to 20 mg, we can substitute L(t) = 20 and solve for t. 20 = 200e0.4621t. Dividing both sides by 200, we have: 0.1 = e0.4621t. Taking the natural logarithm (ln) of both sides, we get: ln(0.1) = 0.4621t. Simplifying, we have: t = ln(0.1) / 0.4621. Using a calculator, we find that t ≈ 2.7 hours. Rounded to the tenths, it will take approximately 2.7 hours for the amount of Lidocaine to reduce to 20 mg.

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The amount of Faradays and moles of electrons are required to produce by electrolysis are calculated thus.

(a) The molar mass of Al is 26.98 g/mol, which means that one mole of Al will require 3 moles of electrons to be produced. To find out the number of Faradays needed to produce 2.70 g of Al, calculate the number of moles of Al:

moles of Al = mass of Al / molar mass of Al

moles of Al = 2.70 g / 26.98 g/mol

moles of Al = 0.100 mol

Faraday's law of electrolysis to calculate the number of Faradays needed:

Faradays = moles of substance / n

n = number of electrons per mole of substance

n for Al is 3, so:

Faradays = 0.100 mol / 3

Faradays = 0.0333 F

Therefore, 0.0333 Faradays are needed to produce 2.70 g of Al.

(b) The molar mass of Mg is 24.31 g/mol, which means that one mole of Mg will require 2 moles of electrons to be produced. To find out the number of Faradays needed to produce 6.0 g of Mg, calculate the number of moles of Mg:

moles of Mg = mass of Mg / molar mass of Mg

moles of Mg = 6.0 g / 24.31 g/mol

moles of Mg = 0.247 mol

Use Faraday's law of electrolysis to calculate the number of Faradays needed:

Faradays = moles of substance / n

n = number of electrons per mole of substance

n for Mg is 2, so:

Faradays = 0.247 mol / 2

Faradays = 0.1235 F

Therefore, 0.1235 Faradays are needed to produce 6.0 g of Mg.

(c) The molar mass of H₂ is 2.02 g/mol, which means that one mole of H₂ will require 2 moles of electrons to be produced. To find out the number of Faradays needed to produce 10 g of H₂, calculate the number of moles of H₂:

moles of H₂ = mass of H₂ / molar mass of H₂

moles of H₂ = 10 g / 2.02 g/mol

moles of H₂ = 4.95 mol

Now use Faraday's law of electrolysis to calculate the number of Faradays needed:

Faradays = moles of substance / n

n = number of electrons per mole of substance

n for H₂ is 2, so:

Faradays = 4.95 mol / 2

Faradays = 2.475 F

Therefore, 2.475 Faradays are needed to produce 10 g of H₂.

(d) The molar mass of Cl₂ is 70.91 g/mol, which means that one mole of Cl₂ will require 2 moles of electrons to be produced. To find out the number of Faradays needed to produce 71 g of Cl₂, calculate the number of moles of Cl₂:

moles of Cl₂ = mass of Cl₂ / molar mass of Cl₂

moles of Cl₂ = 71 g / 70.91 g/mol

2 (a) To produce 27g of Al by electrolysis, calculate the number of moles of Al and then use the equation:

1 mole of Al + 3 moles of e⁻ → 1 mole of Al³⁺

Molar mass of Al = 27 g/mol

Number of moles of Al = 27 g / 27 g/mol = 1 mole

Therefore, 3 moles of electrons are required to produce 1 mole of Al.

To produce 27g of Al:

3 moles of e⁻ / 1 mole of Al × 1 mole of Al = 3 moles of e⁻

So, 3 moles of electrons are required to produce 27g of Al by electrolysis.

(b) To produce 8g of O₂ by electrolysis, calculate the number of moles of O₂ and then use the equation:

2 moles of H₂O + electricity → 2 moles of H₂ + 1 mole of O₂

Molar mass of O₂ = 32 g/mol

Number of moles of O₂ = 8 g / 32 g/mol = 0.25 mole

Therefore, 0.5 moles of electrons are required to produce 0.25 mole of O₂.

To produce 0.25 mole of O₂:

0.5 moles of e⁻ / 1 mole of O₂ × 0.25 mole of O₂ = 0.125 moles of e⁻

So, 0.125 moles of electrons are required to produce 8g of O₂ by electrolysis.

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The mass of aluminum is 181.0 g.

The heat gained by the water is determined from the formula below:

mass of water = 400 g

specific heat capacity of water = 4.18 J/g/°C

temperature change = 58.4 - 25

temperature change = 33.4 °C

Heat gained by water = 400 * 4.18 * 33.4

Heat gained by water = 55844.8 J

Heat gained by water = heat lost by aluminum.

Heat lost by aluminum = 55844.8 J

Specific heat of aluminum = 0.903 J/g/°C

temperature change = 400 - 58.4

temperature change = 341.6 °C

mass of aluminum = 55844.8 /(0.903 * 341.6)

mass of aluminum =  181.0 g

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Answer:

12.46 g

Explanation

the person above me is a slow

Answer:

False

Explanation:

Mass number is the quantity of protons and neutrons within one atom while the atomic mass is the average mass of all isotopes of the element.

Answer:

false :)

Explanation:

During the formation of the ionic compound magnesium sulfide, a magnesium atom donates two electrons to a sulfur atom to make a magnesium ion and a sulfide ion that are then attracted to each other by electrostatic forces.

An ionic bond between two oppositely charged ions that are created as a consequence of the complete transfer of one or more electrons exhibits the electrostatic force of attraction.

An example of an ionic compound is magnesium sulfide formed when a magnesium atom donates two electrons to a sulfur atom to form cations and anions held together by electrostatic forces of attraction.

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A heating curve is a graphical representation of how a substance's temperature changes as it absorbs heat energy.

The x-axis represents the amount of heat energy added, while the y-axis represents the temperature of the substance. The heating curve can be divided into three portions, each representing different changes in the substance's physical state and energy.

At the beginning of the heating curve, particles of the substance have the most kinetic energy when the substance is in its solid state. In this portion, the temperature remains constant as the added heat energy is used to break down the intermolecular forces holding the particles together.

This part of the curve is labeled the "melting point" or "fusion" section.

The next portion of the curve represents the transition from the solid to the liquid state. During this section, the temperature again remains constant as the added heat energy is used to overcome the intermolecular forces and convert the substance to a liquid state. This part of the curve is labeled the "boiling point" or "vaporization" section.

Finally, the last portion of the curve represents the liquid state. In this section, the temperature of the substance begins to increase as the added heat energy is used to increase the kinetic energy of the particles. This portion of the curve is labeled the "condensation" or "freezing" section, depending on whether the substance is being cooled or heated.

Overall, a heating curve is a useful tool for understanding how a substance's energy changes during heating, and how this affects its physical state.

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Answer:

4 hydrogen atoms are needed to C5H8 to saturate it

Explanation: because C5H8 is an alkyne that contains a triple bond or alkene with 2 double bonds.

2 hydrogen atoms are needed to saturate one double bond and 4 hydrogen atoms are needed to fully Saturate a triple bond or two double bonds.

The solutions will be ranked as follows from lowest to highest vapor pressure:

20 g. of glucose C6H12O6 in 100ml h2o

20 g. of sucrose C12H22O11 in 100ml h2o

10 g. of potassium acetate KC2H3O2 in 100ml h2o

The vapor pressure depends on the concentration and nature of the solute. A nonvolatile solute like sugar will decrease the vapor pressure of the solvent, while a volatile solute such as acetate salt , will increase it

Both glucose and sucrose are non-volatile solutes, so they will decrease the vapor pressure of the solvent and thus will have lower vapor pressure than the pure solvent. However, sucrose has a lower molecular weight than glucose which means that it will have a greater effect on the vapor pressure of the solution and thus have a slightly lower vapor pressure.

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Answer:

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question we have

force = 2500 × 5

We have the final answer as

Hope this helps you