a balloon filled with helium has a volume of 36.5 l36.5 l at 295 k.295 k. what volume will the balloon occupy at 263 k

a) The sphere emits thermal radiation at a rate of 139.75 Watts.

b) The sphere absorbs thermal radiation at a rate of 37.66 Watts.

c) The sphere's net rate of energy exchange is 102.09 Watts.

To calculate the rates of thermal radiation emission and absorption, we can use the Stefan-Boltzmann law, which states that the rate of thermal radiation emitted or absorbed by an object is proportional to its surface area, temperature, and the Stefan-Boltzmann constant.

a) The rate of thermal radiation emitted by the sphere can be calculated using the formula:

Emitting Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(temperature^4 - environment\ temperature^4\))

Plugging in the given values:

Emitting Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((32.2 + 273.15)^4 - (82.9 + 273.15)^4)\)

Emitting Rate ≈ 139.75 Watts

b) The rate of thermal radiation absorbed by the sphere can be calculated in a similar way but using the environment temperature as the object's temperature:

Absorbing Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(environment\ temperature^4 - temperature^4\))

Plugging in the given values:

Absorbing Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((82.9 + 273.15)^4 - (32.2 + 273.15)^4)\)

Absorbing Rate ≈ 37.66 Watts

c) The net rate of energy exchange is the difference between the emitting rate and the absorbing rate:

Net Rate = Emitting Rate - Absorbing Rate

Net Rate = 139.75 Watts - 37.66 Watts

Net Rate ≈ 102.09 Watts

Therefore, the sphere emits thermal radiation at a rate of 139.75 Watts, absorbs thermal radiation at a rate of 37.66 Watts, and has a net rate of energy exchange of 102.09 Watts.

Note: The units for all the rates are Watts.

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Answer:

a)Pb(NO3)2+ KI= PbI2+ KNO3

b)PbI2(lead iodide is a yellow crystalline salt)

When animals breathe out, they also emit water vapor into the atmosphere. This is referred to as respiration.

Some of the water that falls to the ground is stored by the earth. Water is excreted by animals through respiration and urine. In animals, the process is known as perspiration or sweating. Evaporation and transpiration convert liquid water into vapor, which rises into the atmosphere as air currents rise. Water vapor, also known as water vapor or aqueous vapor, is the gaseous state of water. It is a type of water in the hydrosphere.

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Answer:

Bacteria

Explanation:

bactiera are single-celled oraganism.

Answer:

bacteria

Explanation: cuz i said so

b. no and d. because adding more energy just makes the water boil faster, the temperature would remain the same.

Cooking food in boiling water using just enough heat to keep the water boiling is already efficient in cooking the food. Turning up the heat would not necessarily make the food cook faster and may even overcook or burn the food. Additionally, the temperature of the water would not increase significantly with added heat, as the boiling point of water is constant.

The use of hot water for cooking is referred to by a number of distinct phrases.

Scalding is done in water that has been heated to about 185 °F (85 °C), typically in a double boiler that transfers the heat of the water from a larger pan to a smaller pan that contains the food, preventing contact between the water and the food.

Simmering, whether in a covered or uncovered pan, is frequently used to create soups, stews, and pot roasts. The simmering point is differently described but generally nearing the boiling temperature.

In blanching, the outer peel of fruits, vegetables, or nutmeats is removed by pouring boiling water over them.

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Incorrect question .

Corrected question- Write the chemical symbol for three different atomic cations that all have 12 electrons.

The number of protons inside the nucleus always remains constant.

∴Chemical symbol of three different atomic cation that have 12 electrons:

Atomic cation is the ion with positive electric charge on it, it means it should have more protons than electrons.

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Al⁺, Si²⁺ ,P³⁺ are the atomic cations with 12 electrons.

∵The nucleus always contains the same number of protons.

∴Three distinct atomic cations with 12 electrons each have the following chemical symbol:

1. Al⁺

2. Si²⁺

3. P³⁺

An ion or atomic cation with a positive electric charge is thought to have more protons than electrons.

• Aluminum (Al) contains 13 electrons, hence Al+ will have = 13 - 1→ 12 electrons (1 electron will be lost for every additional charge).

• Si2+ will have = 14 - 2→ 12 electrons since silicon (Si) has 14 electrons. (+2 charge signifies electron loss of 2);

• Because phosphorus (P) has 15 electrons, P3+ will have 12 electrons because 15-3. (+3 charge indicates that 3 electrons will be lost.)

Hence, Aluminium, Silicon and phosphorus cations have 12 electrons.

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Your question is incorrect. The correct question is -Write the chemical symbols for three different atomic cations that all have 12 electrons.

Explanation:

Hydrogen bonding, present in alcohols but not hydrocarbons, leads to strong intermolecular forces and increases the boiling point significantly.

For example:

Glycerol has 3 OH groups, which lead to a much more extensive hydrogen-bonding network and a higher boiling point compared to the 1 OH or 2 OH in other chains.

The chemical reaction 2(CH3)(CH2)2CH3 + 13O2 is a combustion reaction.


A single replacement reaction is when one element or ion replaces another element or ion in a compound. A double replacement reaction is when two ionic compounds exchange ions to form two new compounds.

The chemical reaction 2(CH3)(CH2)2CH3 + 13O2 is neither a single replacement nor a double replacement reaction. Instead, it is a combustion reaction. Combustion reactions are a type of redox reaction where a fuel reacts with oxygen to produce carbon dioxide and water.

In this reaction, the fuel is 2(CH3)(CH2)2CH3, which is a hydrocarbon known as octane. The oxygen reacts with the octane to produce carbon dioxide (CO2) and water (H2O) according to the balanced chemical equation:

2(CH3)(CH2)2CH3 + 13O2 → 16CO2 + 18H2O

The heat released by this reaction can be harnessed to produce energy, which is why combustion reactions are commonly used to power engines and generate electricity.

In summary, the chemical reaction 2(CH3)(CH2)2CH3 + 13O2 is a combustion reaction, which involves the reaction of a fuel with oxygen to produce carbon dioxide and water.

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Answer:

Hit me with brainlist pls

Explanation:

A equals 6.8 and C is the final answer of the equation so you would subtract the answer from a which gives you 2.6 grams

Answer:

Conductors easily absorb heat and An insulator does not conduct heat well

Explanation:

Answer:

Option C.

Explanation:

The arrangement of electrons in their orbital follows certain rules.

The Hund's rule practically explained how electrons are distributed in their orbitals.

The Hund's rule states that electrons distributed among the orbitals of the same shell singly (without partner) before pairing occurs.

In the filling of these electrons in their orbitals, we fill in the electron without pairing first because electrons tends to repel each other before filling with the opposite spin as shown in the attached photo.

One half-life has passed since the measurement was taken. This implies that the radioactive parent atom has decreased by 50%, and the daughter product has increased by 50%. Answer is option (B) 1.

The parent atom's half-life can be determined by using the equation given below:

Final percentage = (1/2)^n x 100%

where n is the number of half-lives elapsed. After we have rearranged this formula to solve for n, we get:

n = log (final percentage/100%) / log (1/2)

Given the initial ratio of parent to daughter as 25:75, we can assume that 25% of the original parent has remained after n half-lives. As a result, the percentage of the daughter that has been produced is 100 percent minus the percentage of the parent that is remaining.

75 percent = 100% – 25 percent

Let's use this information to determine the number of half-lives that have elapsed:

n = log (75%/100%) / log (1/2)

  = 1

Therefore, one half-life has passed since the measurement was taken. This implies that the radioactive parent atom has decreased by 50%, and the daughter product has increased by 50%.

Answer is option (B) 1.

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0.74 grams

Given the following parameters

Volume of Ca(OH)₂ = 100mL = 0.1L

Molarity of Ca(OH)₂ = 100mM = 0.1M

Determine the moles of Ca(OH)₂

Calculate the mass of Ca(OH)₂

Molar mass of Ca(OH)2 = 20 + (16*2) + (2*1.01)

Molar mass of Ca(OH)2 = 40 +32 + 2.02

Molar mass of Ca(OH)2 = 74.02g/mol

Hence the amount of mass of Ca(OH)2 needed to make 100 ml of a 100mM solution is 0.74 grams

Answer:

the compound that has the smallest ions with the greatest charge

The compound that has the smallest ions with the greatest charge will have the strongest ionic bonds. Therefore, option C is correct.

Ionic compounds can be defined as solids formed by closely packed ions of opposite charge. An Ionic compound is commonly formed when metal combines with non-metal.

In ionic compounds, the ions are held together by ionic bonds. The ions are created by accepting or losing electrons in order to get their nearest noble gas configuration. In a reaction, the metals have a tendency to lose electrons to complete their octet while non-metals will gain electrons to fill their octet.

An ionic bond or electrovalent bond is a type of linkage generated from the electrostatic attraction between oppositely charged ions. Such a bond produces when the valence electrons of one atom are transferred permanently to another.

The more the charge on the ions and the smaller the ions stronger the ionic bond will be formed.

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Answer:

Acceleration

Explanation:

Acceleration doesn't change one moment to the next, and therefore, doesn't count as a force.

The answer option which is not a force is: C. Acceleration.

A force can be defined as a push or pull of an object or physical body, which typically results in a change of motion (acceleration), especially due to the interaction of the object with another.

In Science, the three (3) most common examples of a force include the following:

In conclusion, acceleration is not an example of a force but a change in the rate of velocity of an object with respect to time.

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Answer:“If we’ve covered all of the potential sources, and we know the unique signature of the sand from these different sources, and we find it on a beach somewhere, then we basically know where it came from,” explained Barnard.

Explanation:

Answer:

d: All of the above. Have a nice day!

Answer:

The answer is: All of the above

Explanation:

Based on the calculations, the enthalpy of the overall chemical reaction is equal to: C. -14.3 kJ.

A chemical reaction can be defined as a chemical process that involves the continuous transformation (rearrangement) of the ionic, atomic or molecular structure of a chemical element by breaking down and forming chemical bonds, in order to produce a new chemical compound while new bonds are formed.

A chemical equation can be defined as a group of chemical symbols that is typically used in chemistry to represent the chemical reaction between two (2) or more chemical elements.

Mathematically, an expression for enthalpy of the overall chemical reaction is given by:

ΔHrxn = (n × ΔH₃) + (-n × ΔH₁) + (n × ΔH₂)

Where:

n represents the number of moles.

Substituting the given points into the formula, we have;

ΔHrxn = (2 × ΔH₃) + (-1 × ΔH₁) + (1 × ΔH₂)

ΔHrxn = (2 × (-92.3)) + (-1 × (-74.6)) + (1 × (-95.7))

ΔHrxn = -184.6 + 74.6 + 95.7

ΔHrxn = -14.3 kJ.

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Answer:

2:a-heterogenous

b-homogenous

c-heterogenous

d-heterogenous with water

3:Filtration is used to separate insoluble particles from a solution

Distillation is used to separate liquids with close but different boiling points e.g water and ethanol

Explanation:

2: homogenous mixtures form a uniform layer meaning that a mixture containing more than one layer is heterogenous

The reaction involves the formation of 8 moles of gas (H2S) from solid sulfur and hydrogen gas. This indicates an increase in entropy (ΔS° > 0). Additionally, the reaction is exothermic as energy is released in the form of heat. This means that ΔH° < 0. Using the relationship ΔΔS° = ΔΔH°/T,

we can see that since ΔH° is negative and T (temperature) is positive, the quotient ΔH°/T will also be negative. Therefore, the correct answer is D) ΔΔS° > 0. The reaction involves the combustion of ethanol (C2H5OH) and oxygen gas to form carbon dioxide and water. The number of moles of gas is decreasing as the reactants form fewer moles of gas than the products, indicating a decrease in entropy (ΔS° < 0). Additionally, the reaction is exothermic as energy is released in the form of heat. This means that ΔH° < 0. Using the relationship ΔΔS° = ΔΔH°/T, we can see that since ΔH° is negative and T (temperature) is positive, the quotient ΔH°/T will be negative. Therefore, the correct answer is E) ΔΔS° < 0.

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Answer:

Option b which is n equal to 3

Answer:

it is used for testing the presence of starch in plants

Explanation:

it is the important element

True.

Boron trifluoride (BF3) is a polar molecule because it contains polar covalent bonds and the molecular geometry of the molecule is trigonal planar.

The boron atom has a partial positive charge while the fluorine atoms have a partial negative charge due to the electronegativity difference between them. This creates a net dipole moment in the molecule making it polar.

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The thermometer will read -10°C after about 2.43 minutes.

(a) After four more minutes, the thermometer will read -1°C.

This is because the temperature difference between the room and outdoors is (24 - (-11)) = 35°C.

The thermometer then rises 7°C in one minute, so the thermometer is heated at 7°C/minute, i.e. 35°C in five minutes.

So the temperature of the thermometer after 4 more minutes is 7°C + 7°C + 7°C + 7°C = 28°C, 28°C - 35°C = -7°C, -7°C - 3°C = -10°C.

Thus the reading on the thermometer will be -1°C after four more minutes.

(b) To find out when the thermometer will read -10°C, use the formula:

time = (temperature difference ÷ heating rate) + time to start

       = (-10°C - 7°C) ÷ 7°C/minute + 1 minute

       = -17°C ÷ 7°C/minute + 1 minute≈ -2.43 minutes

Thus, the thermometer will read -10°C after about 2.43 minutes.

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