In the SciShow video above, Hank Green says "Science isn't good or bad. It's only true," then later says "The science doesn't care. It's up to us to decide what we do with it." Do you agree with these statements? Why or why not? Use specific examples to support your answer.


Is the world better off with or without Fritz Haber? Explain your stance. How should we think about the total impact of someone's life?

Answer:

Zn + 2HCl => ZnCl2 + H2

Explanation:

Zn + 2HCl => ZnCl2 + H2

1 Zn +

2 HCl =>

1 ZnCl2 +

1 H2

Answer:

The three essential nutrients needed by organisms are:

Carbohydrates: Carbohydrates are the primary source of energy for the body. They are found in foods like bread, pasta, rice, fruits, and vegetables.

Proteins: Proteins are essential for the growth and repair of tissues in the body. They are found in foods like meat, fish, eggs, dairy products, beans, and nuts.

Fats: Fats are important for energy storage, insulation, and protection of vital organs in the body. They are found in foods like oils, butter, cheese, nuts, and fatty fish.

It is important to note that these three nutrients alone are not enough for a healthy diet. Other important nutrients include vitamins, minerals, and water, which can be obtained from a balanced and varied diet.

With the substance's molar mass in hand, we can use a periodic table or chemical database to look up potential candidates.

We must know the substance's molar mass in order to identify it. By dividing the mass of the sample by the number of moles in the sample, we may determine the molar mass:

Molar mass is equal to the mass of the sample divided by the number of moles.

100 g molar mass = 0.4892767658 mol

204.54 g/mol for the molar mass

With the substance's molar mass in hand, we can use a periodic table or chemical database to look up potential candidates. The substance might be sodium chloride (NaCl), calcium phosphate (Ca3(PO4)2), or many other chemicals with a comparable molar mass, depending on the molar mass.

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As a result, the gas's molar mass is 72.05g/mol. If 0.310 grams of a gas are present at the a temperature of 41.4 degrees and a pressure of 951 mm Hg, the molar mass of the gas is 72.05 g/mol.

The amount of a material measured in moles is multiplied either by mass of a chemical compound to get the molar mass M. MB = m/nB, where m is just the total mass of such a sample of a pure substance & nB is the sum of substance B expressed in moles, is the formula for this equation.

A chemical element or compound's molar mass is calculated by dividing its mass (in grams) by the substance's volume (mol). The standard atomic masses of the constituent atoms (in g/mol) can be added to determine the molar mass of a compound.

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The scientist I have chosen is J.J. Thomson, who made significant contributions to the study of atomic structure in the late 19th and early 20th centuries.

Thomson's most well-known contribution is his discovery of the electron, which he identified as a negatively charged particle present in all atoms. This discovery formed the basis of Thomson's "plum pudding" model of the atom, which proposed that atoms consisted of a positively charged "pudding" with negatively charged electrons scattered throughout.

While this model was eventually disproven, Thomson's discovery of the electron and his work on the measurement of atomic and molecular masses laid the foundation for the modern atomic model. Specifically, Thomson's work on mass spectrometry led to the development of more advanced techniques for determining the masses and properties of atoms and molecules, which are still used in modern research today.

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Explanation:

If there were tides on Jupiter, the moon with the greatest influence on the Jupiter tides would be the moon with the greatest mass and closest distance to Jupiter.

The change in entropy for each reaction is;

1)  -198 J/mol

2) -5 J/mol

3) -148 J/mol

The change in entropy, denoted as ΔS, is a measure of the amount of disorder or randomness in a system before and after a process or reaction. It is defined as the difference between the entropy of the final state and the entropy of the initial state.

The formula for calculating the change in entropy is:

ΔS = S_final - S_initial

where ΔS is the change in entropy, S_final is the entropy of the final state, and S_initial is the entropy of the initial state.

We have that;

1) 2(192.5) - [3(130.58) + 191.50]

= 385 - [391.74 + 191.50]

= -198 J/mol

2) [213.6 + 2(188.83] - [186.3 + 2(205]

= -5 J/mol

3) 2(220) - [2(191.50) + 205]

-148 J/mol

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The strength of the ionic bond is directly dependent upon the quantity of the charges and inversely dependent on the distance between the charged particles. A cation with a 2+ charge will make a stronger ionic bond than a cation with a 1+ charge.

The amount of electrons an atom gains or loses when it forms an ion determines the strength of the ionic charge. An atom becomes positively charged when an electron is lost, and negatively charged when an electron is gained.

The ionic charge increases with the amount of electrons lost or acquired. An ion that has lost two electrons, for instance, will have a higher positive charge than one that has lost only one. Similar to this, an ion with three electrons obtained will have a higher negative charge than one with only one.

The planet you are referring to is not a planet, but a celestial object called a comet. Comets are made up of frozen gas, rock, and dust and can develop a visible "tail" when they get close to the sun due to the heat causing the ice to vaporize and release gas and dust particles.

The measurement of the Earth, Moon, and distance from each other using 1/64 scale is 55600 km that will 1/64 of earths size.

The Moon is just 1/4 the size of Earth, with a diameter of 2,159 miles (3,475 kilometres).

The average distance between the Moon and Earth is 238,000 miles (383,500 km).

Orbit around Earth: It takes the Moon 27.3 Earth days to complete one orbit around our planet.

The Moon rotates on its axis once every 27.3 Earth days.

Surface features include craters, mountain ranges, rilles (long, narrow channels), and lava plains. The enormous, dark areas seen on the Moon's surface are known as maria, or seas. These are, in fact, massive, smooth lava beds. Highlands are brilliant, luminous patches on the Moon's surface.

Around 500 miles (800 kilometres) of the Moon's surface is covered by a solid, rocky crust.

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Answer:

1,915 kilometres above Saturn's surface

The 700 meter's high above Saturn's surface is the Cassini satellite.

What is Saturn?

It is a gas giant with a typical radius that is roughly nine times that of the Earth. Although having only one-eighth the density of the Earth on average, Saturn is nearly 95 times more massive due to its enormous bulk.

The most ambitious planetary space exploration project ever launched is the Cassini mission to Saturn. The Cassini mission, a collaboration between NASA, the European Space Agency (ESA), and the Italian space agency Agenzia Spaziale Italiana (ASI), launched an advanced robotic spacecraft into orbit around the ringed planet.

Therefore, The 700 meter's high above Saturn's surface is the cassini satellite.

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If we have 100 g of O₂,  the mass in  grams of Al₂O₃ will be produced is 477.8 g.

The chemical equation is as follows :

4Al (s) + 3O₂ (g) ==> 2Al₂O₃ (s)

The mass of the O₂  = 100 g

The molar mass of the O₂ = 32 g/mol

The moles of the O₂ = 100 g / 32 g/mol

The moles of the O₂ = 3.125 mol

The 3 moles of the O₂ produces the 2 moles of the Al₂O₃

The moles of the Al₂O₃ = (2/3 ) 3.125

The moles of the Al₂O₃ = 4.687 mol

The mass of the  Al₂O₃ = moles × molar mass

The mass of the Al₂O₃ = 4.687 × 101.96

The mass of the Al₂O₃ = 477.8 g

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The total mass of the reactants equals total mass of the products, means there is no change in mass during a chemical reaction.

This is due to the law of conservation of mass, which states that the total mass of a system does not change regardless of variations in its components. For mass cannot be created or destroyed, rearranged, or only moved.

In chemical reaction, atoms has rearranged itself to form a new molecules, but the total mass remains the same. It is because the total mass of reactants and products is sum of masses of each atom involved.

So, in any chemical reaction, the total mass of reactants and products remains the same because mass is conserved.

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0.5 moles of NH3 will form from the complete reaction of 14.0 g of N2.

Mole is a unit of measurement used to measure the amount of a substance. It is defined as the number of atoms, molecules, ions, or other particles present in a given sample of a substance. The mole is an important concept in chemistry because it allows for direct comparison of the relative amounts of substances in a reaction. It is also used in physics to calculate the number of particles in a given volume. The mole is a base unit in the International System of Units (SI), and its symbol is "mol".

The number of moles of NH3 produced from 14.0 g of N2 can be determined using the following equation:
moles NH3 = (14.0 g N2) / (28.0 g/mol N2) x (1 mol NH3 / 3 mol H2)
moles NH3 = 0.5 mol NH3
Therefore, 0.5 moles of NH3 will form from the complete reaction of 14.0 g of N2.

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Answer: 3045.07 K

Explanation:

T=PV/nR  = 10.00 X 100 / (4.0 X 0.821) =

The number of moles present in the 1.2×10²⁴ molecules of the sample is 2 moles

The number of mole of the sugar in the sample containing 1.2×10²⁴ molecules can be obtained as follow:

From Avogadro's hypothesis,

6.022×10²³ molecules = 1 mole of NaCl

Therefore, we can say that

1.2×10²⁴ molecules = 1.2×10²⁴ / 6.022×10²³

3.011×10²³ molecules = 2 mole of sugar

Thus, the number of mole of sugar present is 2 mole

From the above calculation, we can see that we started with molecules and we ended in moles

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Lead cannot melt at such level, hence it cannot break down into individual atoms or molecules. A change in the bonding of atoms or molecules is referred to as melting.

The metallic connections are broken and the atoms are made more mobile by the energy needed to melt the metal. Atoms have the same kinetic energy as they did as a solid at a particular temperature, such as the melting point.

No, an atom cannot be melted. The three common states of matter no longer hold true when you are dealing with so tiny a piece. Atoms do not alter until by nuclear fission or fusion.

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The answer is (A), Greater growth and activity are seen in plants during Florida's spring season, which is mainly caused by a combination of two environmental factors: longer daylight hours and warmer temperatures.

The Atlas of Florida Vascular Plants estimates that Florida is home to more than 4,200 plant varieties that are not grown in cultivation. Nearly 3,000 of those 4,200 species are regarded as local. The bulk of plants are terrestrial, or land-based.

One of the cheeriest plants you can cultivate in your garden is the coreopsis, the official state flower of Florida. However, plant breeders have been hard at work and you can now find choices with single or double flowers, or blooms in hues of gold, yellow, and even orange, red, and pink.

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The modified circuit can no longer boil water because: "The hot plates use electrical energy to generate heat. When a second load is added, electrical energy from the circuit is now shared between two hot plates.Therefore, the correct option is D.

Electrical energy is a form of energy that results from the movement of charged particles, such as electrons. It is the energy that is transferred when an electric current flows through a conductor, and can be converted into other forms of energy, such as heat, light, or mechanical energy.

When a second load is connected, the circuit's electrical power is now split between two hot plates. Because of this, each hot plate uses less electricity and cannot produce as much heat.Therefore, the correct option is D.

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The question is incomplete, but most probably the complete question is,\

You build a circuit to power a hot plate. The hot plate can quickly heat up and boil a pot full of water. You add a second hot plate to the same circuit. Both plates heat up, but neither plate gets hot enough to boil water. Explain why the modified circuit can no longer boil water. (1 point)

A. The hot plates use electrical energy to generate heat. By adding a second hot plate, you have made an open circuit. This means the path of electricity from the energy source to the hot plates is interrupted.

B. The hot plates use electrical energy to generate heat. If the plates do not generate enough heat to boil water, both loads must be broken.

C. The hot plates use electrical energy to generate heat. If the plates do not generate enough heat to boil water, the energy source of the modified circuit must be broken.

D. The hot plates use electrical energy to generate heat. When a second load is added, electrical energy from the circuit is now shared between two hot plates. This means each hot plate receives less electrical energy and cannot generate as much heat.

To solve this problem, we first need to use stoichiometry to determine the number of moles of O2 produced by the decomposition of 37.25 grams of KCIO3.

From the balanced equation, we know that 2 moles of KCIO3 decompose to produce 3 moles of O2. Therefore, we can use the molar mass of KCIO3 to convert 37.25 grams to moles:

37.25 g KCIO3 x (1 mol KCIO3/ 122.55 g KCIO3) = 0.3032 mol KCIO3

Using the stoichiometry of the balanced equation, we can convert the moles of KCIO3 to moles of O2:

0.3032 mol KCIO3 x (3 mol O2/ 2 mol KCIO3) = 0.4548 mol O2

Now that we know the number of moles of O2 produced, we can use the ideal gas law to calculate the volume of gas produced at the given temperature and pressure.

V = nRT/P

Where:

V = volume of gas (in liters)

n = number of moles of gas

R = ideal gas constant (0.0821 L·atm/K·mol)

T = temperature (in Kelvin)

P = pressure (in atm)

First, we need to convert the temperature to Kelvin:

12.43°C + 273.15 = 285.58 K

Now we can substitute the values into the ideal gas law equation:

V = (0.4548 mol)(0.0821 L·atm/K·mol)(285.58 K)/(941.34 kPa/101.325 kPa/atm)

V = 0.0151 L or 15.1 mL (rounded to three decimal places)

Therefore, 37.25 grams of KCIO3 will produce 15.1 mL of O2 at a temperature of 12.43°C and 941.34 kPa.

In the above question regarding metals and conductors, I is false and II is true (option B).

A conductor is a something that can transmit electricity, heat, light or sound.

Metallic elements or solids are excellent conductors of electricity and heat because their atoms form a matrix through which outside electrons can easily move.

Instead of orbiting their individual atoms, they generate a sea of electrons around the positive nuclei of the interacting metal ions.

Therefore, statement I is false while II is true.

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The periodic chart is a tabular collection of chemical elements arranged according to atomic number, starting with hydrogen and going up to oganesson, which has the greatest atomic number.

In the periodic table, also referred to as the periodic chart of the (chemical) elements, the chemical elements are organised in rows and columns. It is frequently used in physics, chemistry, and other academic fields and is widely recognised as a sign of chemistry.

This is a visual representation of the periodic law, which states that the properties of molecular elements depend approximately periodically on their atomic numbers. There are four roughly rectangular "pieces" that make up the table's top.

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The cost (in dollar) of running your 100 watt light bulb at the time per month is $ 14.4

First, we shall determine the energy consumed per month by the light bulb

E = Pt

E = 0.1 × 720

E = 72 KWh

Finally, we shall determine the cost of running the light bulb. Details below

Cost = energy × Cost per KWh

Cost of running per month = 72 × 0.2

Cost of running per month = $ 14.4

Thus, we can conclude that the cost of running per month is $ 14.4

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A piece of metal weighing 59.047g was heated to 100°C and then put into a 100mL of water. The metal and water were allowed to come to an equilibrium temperature determined to be 27.8°C. 0.40J/g °C is the  specific heat of the metal.

In thermodynamics, the massic heat capacity (also known as massic heat capacity) of a material is indeed the heat capacity of such a sample of both the material divided by that of the mass of the sample (symbol c).

Informally, it refers to the quantity of heat that needs to be added between one unit of a substance's mass in order to raise its temperature by one unit.

m₁ × c₁×(final temperature-T₁) =-(m₂×c₂×(final temperature-T₂)

59.04 × c₁×(27.8-100) =-(100×4.18×(27.8-23.7)

c₁ =0.40J/g °C

Therefore, 0.40J/g °C is the specific heat of the metal.

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The reagent which is completely consumed in a reaction and thereby limits how much product can be formed is called the limiting reagent. Here the limiting reagent is O₂.

The quantity of the product which is actually made compared with the maximum calculated yield is defined as the percent yield. The percent yield is the ratio of the actual yield to the theoretical yield.

% Yield = Actual yield / Theoretical yield × 100

The number of moles (n) = Given mass / Molar mass

'n' of C₂H₄ = 170.9 / 28.05 = 6.09 mol

'n' of O₂ = 64.1 / 31.9 = 1.65 mol

So O₂ is the limiting reactant.

Theoretical yield of CO₂ is:

170.9 × 1 mol / 28 g × 2 mol / 1 × 44/1 = 537.1 g CO₂

%Yield = 64.1 / 537.1 × 100 = 11.93 %

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Your question is complete most probably your full question was:

In an experiment, 170.9 g of C_{2}*H_{4} was reacted with 52.75g of O₂, 64.1 g of C*O_{2} is produced .What is the limiting reagent? ) What is the percent yield of this reaction?

In aquaponics, the ammonia present in water is converted into nitrates which is used by the plants as a nutrients which is a chemical change. When the mass is converted into energy, it increases the temperature of the ecosystem and also the earth surface indicating a physical change.

Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.

There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

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Na2CO3(aq) and H2O are produced by the reactions CO2(aq) + NaOH(aq) and CO2(aq) + 2NaOH(aq). (l) When carbon dioxide is dissolved in a sodium hydroxide aqueous solution,

Definition. In an aqueous solution, liquid water acts as the solvent. In other words, water molecules surround and incorporate the ions and molecules that make up the solute (dissolved) into their network of links. The dissolved organisms then spread out throughout the water.

Water and one or more dissolved substances make up aqueous solutions. In an aqueous solution, solids, gases, or other liquids can all dissolve. For a combination to be taken seriously as a solution, it must be stable.

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