Which of the following receives their energy from the sun's light to generate a sugar source for cellular respiration?
Phototrophs
Lithotrophs
Chemotrophs
Heterotrophs

It will take approximately 49,580 years for 80% of the plutonium-239 isotope to decay.

To determine the time required for 80% of the plutonium-239 isotope to decay, we can use the concept of half-life. The half-life of a radioactive isotope is the time it takes for half of the initial amount of the isotope to decay.

Given that the half-life of plutonium-239 is 24,360 years, we can calculate the number of half-lives required for 80% decay. Since each half-life reduces the amount of the isotope by half, we need to find how many times we need to divide 10 g (the initial amount) by 2 to reach 80% of the original amount.

Let's calculate:

Initial amount = 10 g

Amount after one half-life = 10 g / 2 = 5 g

Amount after two half-lives = 5 g / 2 = 2.5 g

Amount after three half-lives = 2.5 g / 2 = 1.25 g

Amount after four half-lives = 1.25 g / 2 = 0.625 g

We can see that after four half-lives, the amount remaining is less than 20% of the initial amount. Since each half-life is 24,360 years, the time required for four half-lives is approximately 97,440 years. Therefore, it will take approximately 49,580 years (97,440 years - 47,880 years) for 80% of the plutonium-239 isotope to decay.

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Answer:

gas and liquid

Explanation:

right?

Answer:2

Explanation:

Answer:

2

Explanation:

Answer:

when there is high pressure and low temperature then the solubility of a gas will be greatest.

Answer:

B

Explanation:

edg 2021

Answer/Explanation:

quantum of energy is important because the energy of a particle, and also how long it has had that energy, with infinite precision. Quantum, in physics, discrete natural unit, or packet, of energy, charge, angular momentum, or other physical property. the term also applicable to quanta of other forms of electromagnetic energy such as X - rays and gamma rays.

The single replacement reaction is that in which one element is substituted for another element but in the same compound.

A single replacement reaction is also known as a single displacement reaction. The single replacement reaction is defined as the reaction in which one element is substituted for another element in a compound. In the beginning, the starting element is always will be pure metal, such as pure zinc metal.

Identification:

We can determine the single replacement reaction when one element replaces another element in the same compound. This kind of reaction is represented by: A + BC → B + AC.

Determination:

The single replacement reaction can be determined when a less reactive element can be replaced by a more reactive element in a compound.

So we can conclude that one element is replaced by another element in the single replacement reaction.

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Answer:

Last Column is:

Explanation:

98  ,   7.8   ,   371    and     0.98

\(\huge\green{\boxed{\fcolorbox{red}{black}{ \orange{QUESTION} }}}\)

what is difference about scientist thinking and common peoples thinking and what is logical thinking

\( \huge\mathbb{\red A \pink{N}\purple{S} \blue{W} \orange{ER}}\)

\( \orange{\underline{\huge{\bold{\textit{\green{\bf{DIFFERENCE}}}}}}} \)

\( \orange{\underline{\huge{\bold{\textit{\green{\bf{BETWEEN}}}}}}} \)

SCIENTIST THINKING and COMMON PEOPLES THINKING:-

\(\blue{SCIENTIST\: \: \: THINKING-> }\)

They believe in asking questions to themselves and try to find there answers by themselves with help of there observation with large number of observation sometimes they also provide a hypothesis.

They use always use critical thinking which helps one to think and solve one situation beyond its memory. this helps to find new ideas

They use inductive reasoning or deductive reasoning to develop a hypothesis deriving most logically from available data.

\( \orange{COMMON \: \: PEOPLES \: \: THINKING-> }\)

They believe easily on what other told them to believe. common people relay on the answer of the experts or scientists then researching on the topic themselves

Critical thinking is rare in Common public thinking bez in our daily routine we believe on what we read and hear.

logical thinking is found rare in common public as they didn't think about the logic of what is happening in day to day life .

\(\bold{\green{Part 2:- What \: Is \: Logical \: Thinking}}\)

It the way of thinking in which we check about the logic of the what is happening around u

In this type of Thinking a person finds reasons and causes of each and every observation

This helps in new law formation and helps in finding the solution of each and every problem.

With the logical thinking one uses feedback in positive way and try to solve that.

This type of thinking our lines become short and clear . this helps us to give perfect answer for each and everything.

Answer:

Unbalanced

Explanation:

\(\text{Fe}(\text{NO}_3)}_3+ \text{NaOH} \rightarrow \text{Fe(OH)}_3 + \text{NaNO}_3\\\\\text{Balanced reaction:}\\\\\text{Fe}(\text{NO}_3)}_3+ 3\text{NaOH} \rightarrow \text{Fe(OH)}_3 + 3\text{NaNO}_3\)

a) Cross-over temperature for SO3(g) + H2O(g) → H2SO4(l) is approximately 735 K or 462°C.(b) The reactions NO2(g) ⇌ NO(g) + 1/2 O2(g) . and (c)  MnO2(s) + 2 CO(g) → 2 CO2(g) + Mn(s) are always spontaneous at all temperatures physically possible.

(a) The spontaneity of a reaction can be determined by the Gibbs free energy change (ΔG) which is related to the equilibrium constant (K) of the reaction through the equation: ΔG = -RTlnK, where R is the gas constant and T is the temperature in Kelvin.

For the reaction SO3(g) + H2O(g) → H2SO4(l), the equilibrium constant K is approximately 4.6 x 10² at 298 K. To calculate the cross-over temperature, we can set ΔG to zero (since the reaction will be spontaneous when ΔG is negative) and solve for T:

0 = -RTlnK

T = -ΔG/ (R lnK) = -(-2.7 x 10⁴ J/mol) / (8.314 J/mol/K x ln 4.6 x 10²)

T ≈ 735 K or 462°C

Therefore, the cross-over temperature for this reaction is approximately 735 K or 462°C.

(b) For the reaction NO2(g) ⇌ NO(g) + 1/2 O2(g), the equilibrium constant K is approximately 6.2 x 10⁻³ at 298 K. To calculate the cross-over temperature, we again set ΔG to zero and solve for T:

0 = -RTlnK

T = -ΔG/ (R lnK) = -0 / (8.314 J/mol/K x ln 6.2 x 10⁻³)

T = 0 K

Since the temperature cannot be negative, this reaction is always spontaneous at all temperatures physically possible.

(c) For the reaction MnO2(s) + 2 CO(g) → 2 CO2(g) + Mn(s), the ΔG value is negative under standard conditions (298 K and 1 atm pressure), indicating that the reaction is spontaneous at this temperature. Therefore, the reaction will be spontaneous at all temperatures physically possible.

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The volume of the balloon in the freezer is approximately 1.77 L.The ideal gas law is PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is temperature.

Since pressure is constant, we can use the combined gas law to solve the problem.The combined gas law is

P1V1/T1 = P2V2/T2,

where P1 and T1 are the initial pressure and temperature, and P2 and T2 are the final pressure and temperature. Let's start with the initial state of the balloon:

V1 = 2.00 L T1

= 32.0 °C + 273.15 K

= 305.15 K

Now let's find the final volume of the balloon when it's in the freezer:

V2 = P1V1T2/T1P1

= constant

T2 = -3.6 °C + 273.15 K

= 269.55 K

Now we can plug in the values and solve for V2:

V2 = P1V1T2/T1

= (1 atm)(2.00 L)(269.55 K)/(305.15 K)

≈ 1.77 L

Therefore, the volume of the balloon in the freezer is approximately 1.77 L.

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Answer:

Carbon is released back into the atmosphere when organisms die, volcanoes erupt and even when fossils are buried

Answer:

K Only

Explanation:

Pretty sure that we only use Kelvin Scale in gas laws as it provides us with the absolute temperature, this is because in gas laws we are also concerned with motion of particles i.e. kinetic energy and we only use kelvin because 0K means 0 kinetic energy (we cannot do the same using other units)

Answer:

B

Explanation:

Approximately 12.45 grams of solid silver chromate will precipitate when 150 mL of 0.500 M silver nitrate solution is added to excess potassium chromate.

To determine the number of moles of AgNO3 present in 150 mL of a 0.500 M AgNO3 solution, we can use the formula:

moles = concentration × volume

Given:

Concentration of AgNO3 solution = 0.500 M

Volume of AgNO3 solution = 150 mL

First, we need to convert the volume from milliliters (mL) to liters (L) since the concentration is given in moles per liter (M).

1 L = 1000 mL

Therefore, the volume of the AgNO3 solution in liters is:

150 mL × (1 L / 1000 mL) = 0.150 L

Now we can calculate the moles of AgNO3 using the formula:

moles = concentration × volume

moles = 0.500 M × 0.150 L

moles = 0.075 mol

So, there are 0.075 moles of AgNO3 present in 150 mL of the 0.500 M AgNO3 solution.

Now, let's proceed to determine how many grams of solid silver chromate (Ag2CrO4) will precipitate when the AgNO3 solution reacts with excess potassium chromate (K2CrO4).

From the balanced chemical equation:

2AgNO3(aq) + K2CrO4(aq) → Ag2CrO4(s) + 2KNO3(aq)

We can see that the molar ratio between AgNO3 and Ag2CrO4 is 2:1. Therefore, for every 2 moles of AgNO3, we will form 1 mole of Ag2CrO4.

Since we have 0.075 moles of AgNO3, we can calculate the moles of Ag2CrO4 formed:

moles of Ag2CrO4 = 0.075 mol / 2 = 0.0375 mol

To determine the mass of Ag2CrO4, we need to multiply the moles by its molar mass. The molar mass of Ag2CrO4 is calculated by summing the atomic masses of each element in the compound:

Ag2CrO4 = 2(Ag) + 1(Cr) + 4(O) = 2(107.87 g/mol) + 1(52.00 g/mol) + 4(16.00 g/mol) = 331.87 g/mol

mass of Ag2CrO4 = moles of Ag2CrO4 × molar mass of Ag2CrO4

mass of Ag2CrO4 = 0.0375 mol × 331.87 g/mol = 12.45 g

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Answer:

Magnesium Mg act as anode

Explanation:

Because its reduction potential is much less than zinc

Answer: C. Mg(s)

Explanation:

Answer:

sound energy

Explanation:

Answer:

Chemical energy

Explanation:

Answer:

Sink

Explanation:

For a substance to float in water, it must be less dense than water. The density of water is 1 g/cm^3. To find the density of the substance, we can do mass/volume, which in this case is 25g/7cm^3. We see that \(25/7 > 1\), so the substance would sink.

Answer:

6

Explanation:

if there is 10n and the friction is 4n on the table then it is 6n.

i hope this helps you! :)

The mass percent of isopropanol in the solution is 42.2%.

To calculate the mass percent of isopropanol, we need to first calculate the total mass of the solution.

Mass of isopropanol = volume of isopropanol * density of isopropanol = 450.0 ml * 0.7860 g/ml = 353.7 g

Mass of water = volume of water * density of water = 617.5 ml * 1.000 g/ml = 617.5 g

Total mass of solution = mass of isopropanol + mass of water = 971.2 g

Mass percent of isopropanol = (mass of isopropanol / total mass of solution) * 100% = (353.7 g / 971.2 g) * 100% = 42.2%

Therefore, the mass percent of isopropanol in the solution is 42.2%.

In summary, we can find the mass percent of isopropanol in a solution by dividing the mass of isopropanol by the total mass of the solution, and then multiplying by 100%. In this problem, we first calculated the mass of isopropanol and water using their respective densities and volumes, then added them together to find the total mass of the solution. Finally, we applied the formula to find the mass percent of isopropanol.

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The following substances can behave as Bronsted-Lowry acids in aqueous solution: HNO₃ and  NH₄+

The correct answer is a and b.

The Bronsted-Lowry acid theory is a chemical theory that explains acids and bases and their reactions. It defines acids as proton donors and bases as proton acceptors.

According to the definition provided by Bronsted–Lowry, an acid is a proton (H+) donor, while a base is a proton acceptor. At the point when a Brønsted-Lowry corrosive loses a proton, a form base is shaped. Similarly, a conjugate acid is produced when a Bronsted–Lowry base acquires a proton.

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Assuming the sun's energy is radiated uniformly in all directions,  the total power is (π \(r . ^{2}\) * σ\(R^{2} T^{4}\))/\(r^{2}\)

According to Stefan's law, if the sun were a perfect blackbody, its energy output per second would be:

P=σA\(T^{4\left \ }\)

(Where P is energy radiated per second and A is the area of the sun.)

⇒P=σ×4π\(R^{2} T^{4}\).............(1)

Assuming r>>r., the strength of this power at the earth's surface is

I= P/4π\(r^{2}\)

​⇒I= σ×4π\(R^{2} T^{4}\)/4π\(r^{2}\)

(Inserting the value obtained from equation (1))

⇒I= σ\(R^{2} T^{2}\)/\(r^{2}\)

Due to its great distance from the sun, the earth only receives a small portion of the energy that is radiated. The earth can be visualized as a little disc with a radius equal to that of the planet.

The disc's surface area is \(r .^{2}\) hence the earth's total radiant energy as received is:

PE=π\(r. ^{2}\)×I

P E = (π \(r . ^{2}\) * σ\(R^{2} T^{4}\))/\(r^{2}\)

Assuming the sun's energy is radiated uniformly in all directions,  the total power is (π \(r . ^{2}\) * σ\(R^{2} T^{4}\))/\(r^{2}\)

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Answer:D-when explaining and documenting their work

Explanation:I took the k-12 test and got it right!:) Hope this helps!!!!

Scientists can engage in various activities in various sequences. It can be best explained by documenting and explaining their work. Thus, option D is correct.

The scientific method has been a series of events that uses observed phenomena to conduct research by testing the hypothesis that raises the question. It conducts the experiment and reaches the results to conclude the findings.

In various scientific sequences, scientists can be engaged at a time similar to explaining and documenting the work involves representation of the proper rationale and its deep and thorough explanation so to justify the hypothesis and its accountability.

Therefore, option D. the explanation and documentation are the various activities involved in different sequences.

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Answer:

1.0 more acidic and 2.0 more acidic

Explanation:

5.5-4.5=1.0

6.5-4.5=2.0

If the temperature increases, then the concentration of sodium hydroxide (NaOH) will decrease because the equilibrium will shift in the backward direction.

Sodium hydroxide is an ionic compound consisting of Na⁺ and OH⁻. It is also called as caustic soda. It is an inorganic compound with chemical formula NaOH.

When NaOH dissolve in water it is exothermic in nature. As the temperature increases, the equilibrium will shift in the backward direction.Therefore,as to nullify the effect of increased temperature. It will decrease the solubility of NaOH in water.

Thus, If the temperature increases, then the concentration of sodium hydroxide (NaOH) will decrease.

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Based on the information given, the mole should be considered a base unit in the SI system because it serves as a universally accepted measure of the amount or quantity of substances.

The mole of a substance is the amount of a substance that contains as many elementary particles as there are in 12 g of carbon-12.

12 g of carbon-12 contains the Avogadro number of particles which equals 6.02 * 10²³ particles.

Hence, a mole of a substance is the amount of that substance that contains  6.02 * 10²³ elementary particles of that substance.

SI units refer to units of measurement that are universally accepted for measuring the properties of quantities of objects.

Some SI unit values include:

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