an aerosol spray can with a volume of 2 l contains 0.5 mol of propane (c3h8) as a propellant. what is the pressure of the gas in the can at 300k?

The maximum mass of titanium that can be obtained from 500 tonnes of titanium(IV) chloride in this reaction is 24,000 tonnes.

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The number of atoms in 5.90 mol of calcium (Ca) is 3.54 x 10²⁴ atoms.

To calculate the number of atoms in 5.90 mol of calcium (Ca), we use Avogadro's constant which is defined as the number of particles in one mole of a substance. Its value is 6.02 x 10²³ particles/mol.

Avogadro's number is used to relate the number of particles (atoms, molecules, ions) in a substance to the number of moles. Therefore, the number of atoms in 5.90 mol of calcium is given as;

Number of particles (atoms) of calcium = n × NA= 5.90 mol × 6.02 x 10²³

particles/mol= 3.54 x 10²⁴ atoms

Therefore, the number of atoms in 5.90 mol of calcium is 3.54 x 10²⁴ atoms.

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Answer:

Life could not exist on Earth without trees because they produce most of the oxygen that humans and wildlife breathe. Trees absorb carbon dioxide from the atmosphere and release oxygen using the process of photosynthesis.

Answer:

i dont know

Explanation:

Answer:

Large-scale natural disasters

Explanation:

The emergency situation that rescue workers could be in that would make it difficult for them to get energy to their electrical devices is "Large-scale natural disasters"

Large-scale natural disasters are very destructive and devastating. Their impact and effect can range from destruction of infrastructures, properties, social amenities and even ecosystems. When such disasters break out, they destroy things and which leads to difficulty in accessing certain amenities. Rescue workers even find it difficult to access energy for their electrical devices - because there is power outage.

Some of these large-scale natural disasters are earthquakes, tornadoes, hurricanes, floods, etc.

Answer: C. Silicon

A solid-state rectifier is primarily made of silicon, which is a semiconductor material. Silicon is used in the manufacturing of rectifiers because it has unique electrical properties that make it ideal for this purpose. When impurities, such as boron or phosphorus, are added to silicon, it becomes a better conductor of electricity in certain areas, creating a p-n junction. This p-n junction is the basis of the diode, which is the fundamental building block of the rectifier. Therefore, silicon is the primary material used in the construction of solid-state rectifiers.

The most commonly used substance in the production of solid-state rectifiers is (D) Silicon.

A solid-state rectifier is an electronic device that is primarily used to convert AC (alternating current) to DC (direct current) by using semiconductor materials.

Silicon is a widely used semiconductor material that has excellent electrical properties. It is highly conductive and has a stable electrical response. It is readily available and affordable. The process of manufacturing solid-state rectifiers involves doping silicon with impurities to create a PN junction. The PN junction is a critical component of a solid-state rectifier, as it allows the device to act as a one-way valve that only permits the flow of current in one direction.

Iron and aluminum are not commonly used in the production of solid-state rectifiers because they do not have the electrical properties required to function as semiconductor materials. Arsenic is a semiconductor material that is sometimes used in the production of solid-state rectifiers, but it is not as widely used as silicon due to its high toxicity.

In conclusion, solid-state rectifiers are primarily made of silicon, which is an affordable, widely available, and highly conductive semiconductor material that is used to create the PN junction required for the device to function as a one-way valve.

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Answer:

Hard water is water that has high mineral content, Soft water is free from dissolved salts of such metals as calcium, iron, or magnesium

Explanation:

The source in smoke detectors, which is Americium-241, emits alpha particles. These alpha particles are detected by the detectors in the smoke alarm and trigger an alarm to sound when smoke enters the detector.

So, in a typical home with multiple smoke detectors, you would expect the source to emit radioactive alpha particles. Smoke detectors utilize the radioactive decay of Americium-241, which emits alpha radiation. Alpha radiation is suitable for smoke detectors because it has low penetration and can be easily disrupted by smoke particles, triggering the alarm. The sensors are designed to sense changes in radiation levels due to smoke, ensuring safety in a typical home. Alpha particles are positively charged particles consisting of two protons and two neutrons. They are emitted during radioactive decay and have low penetrating power, being stopped by a few centimeters of air or a sheet of paper. Alpha decay is commonly observed in heavy nuclei such as uranium.

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The number of protons is 29, the number of neutrons is 36 and the number of electrons is 29 in \(X_{65}^{29}\).

To determine the number of protons, neutrons, and electrons in an atom, you need the atomic number (Z) and the mass number (A) of the element.

In the case of \(X_{65}^{29}\), the atomic number (Z) is 29, which corresponds to the number of protons in the nucleus of the atom. The total of protons and neutrons is represented by the mass number (A), which is 65.

Number of protons = Atomic number (Z) = 29

Number of neutrons
\(= Mass number (A) - Number of protons\)
= 65 - 29 = 36

When an atom is neutral, the number of electrons and protons in the atom are equal. So, in this case, there are 29 electrons.

Therefore, there are 29 protons, 36 neutrons, and 29 electrons in a nucleus.

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Answer:

secondary consumer

Explanation:

The salt water food web begins with producers (plants, algae, phytoplankton) that create food from sunlight, and continues with primary consumers (zooplankton) that eat the producers, followed by secondary consumers (shrimp, crustaceans, small fish) that eat the primary consumers, then tertiary consumers

Answer:

The octet rule is a chemical rule of thumb that reflects the observation that main group elements tend to bond in such a way that each atom has eight electrons in its valence shell, giving it the same electronic configuration as a noble gas.

Explanation:

The fizzing of a soft drink is primarily caused by the release of dissolved carbon dioxide gas.

When a can of soft drink is pressurized, the carbon dioxide gas is forced to stay dissolved in the liquid. When the can is opened, the pressure is released, causing the carbon dioxide to come out of solution and form bubbles.

At higher altitudes, such as the peak of Mt. Everest, the atmospheric pressure is lower compared to sea level. This lower pressure allows the dissolved carbon dioxide gas in the soft drink to escape more easily. When the can is opened, the lower external pressure allows the gas to rapidly come out of solution, resulting in a more pronounced fizzing effect.

Therefore, due to the difference in atmospheric pressure, opening a can of soft drink at the peak of Mt. Everest would lead to a more significant fizzing compared to opening it at sea level.

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At STP, a mole of pure gas is closest in size to a marble. As a tiny, solid material, a gram of gas at the STP is considerably smaller than a marble. D is the correct response.

At Standard Pressure and Temperature, 22.4 L of any gas will be required to hold 1 mole (STP). The Ideal Gas Law and a balanced chemical equation can be used to determine the amount or mass of gas consumed or created in a chemical process. In other words, the gas that has the greatest number of molecules of a certain gas at a given temperature will occupy the largest volume.

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Question: From the following items, which is closest in size to one mole of gas at STP?

A) A car

B) An elephant

C) A microwave

D) A marble

It takes approximately 100.704 years (since 1964) until only 9 percent of the original amount of radioactive strontium-90 absorbed remains.

The half-life of radioactive strontium-90 is given as 29 years, which means that every 29 years, the amount of radioactive strontium-90 is reduced by half.

To find the number of years it takes until only 9 percent of the original amount remains, we can set up the following equation:

(0.5)^(t/h) = 0.09

Where:

t represents the number of years since 1964 (the initial time),

h represents the half-life of 29 years, and

0.09 represents 9 percent.

Let's solve for t:

(0.5)^(t/29) = 0.09

Taking the natural logarithm (ln) of both sides:

ln[(0.5)^(t/29)] = ln(0.09)

Using the logarithmic property: ln(a^b) = b × ln(a):

(t/29) × ln(0.5) = ln(0.09)

Dividing both sides by ln(0.5):

t/29 = ln(0.09) / ln(0.5)

t = 29 × (ln(0.09) / ln(0.5))

Using a calculator, we can find the value of t:

t = 29 × (-2.40794561 / -0.69314718)

t = 100.704

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Answer: The products will be copper and oxygen.

Explanation: Copper electorde is an active electrode so it constantly takes part in the electrolysis. Cathode is a pure copper negative electrode and anode is a impure copper positive electrode. So the copper present in the solution, along with the copper present in the anode will come off and go to the cathode. As a result, cathode gains copper. And the remaining impurities settle down in the bottom.

In the anode, oxygen will be given off because according to the order of discharge, if SO4 is present then the ions will stay in the solution and oxygen will be released. So at the end, solution of SO4 and H2O will be remaining while copper and oxygen is extracted.

The half equations are-

Cathode: Cu2+ + 2e- = Cu

Anode: Cu + 2e- = Cu2+

Something you might not know: The solution in electrolysis turns blue when copper goes to the cathode. So copper electrodes are also used in electroplating.

The total charge that flows while the battery is being charged is approximately 193,939.39 Coulombs.

To calculate the total charge that flows while the battery is being charged, we can use the relationship between electrical energy, potential difference, and charge.

The electrical energy (E) stored in the battery is given as 64 mega Jules (64 MJ). The potential difference (V) provided by the battery is 330 volts. We know that the energy (E) is equal to the product of the potential difference (V) and the charge (Q):

E = V * Q

Since the charging process is 100% efficient, all the electrical energy supplied is stored in the battery. Therefore, we can rearrange the equation to solve for the charge (Q):

Q = E / V

Substituting the given values, we have:

Q = 64 MJ / 330 V

To perform the calculation, we need to convert mega Jules (MJ) to joules (J) since the SI unit of energy is joules. One mega Joule is equal to 1 million joules:

Q = (64 * 10^6 J) / 330 V

Calculating the division:

Q ≈ 193,939.39 Coulombs

Therefore, the total charge that flows while the battery is being charged is approximately 193,939.39 Coulombs.

This value represents the quantity of electric charge transferred during the charging process, and it indicates the amount of electricity that enters the battery.

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The coefficients in front of each reactant and product allow us to predict how much reactants are required to form a given amount of products.

Reactants are converted to products and the process is symbolized by a chemical equation. For example  (Fe) and  (S) combine to form iron sulfide Fe(s) + S(s) → FeS(s) The plus sign indicates that iron reacts with sulfur.

Therefore, chemical equation is a mathematical expression of the chemical reaction which represents the product formation from the reactants. In an equation the reactants are written on the left-hand side and the products are written on the right-hand side demonstrated by one-headed.

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Answer: there are 12 atoms of carbon. An example of an element is iron and an example of a compound is NaCl (salt)

Explanation:

The reaction you provided, C2H6(g) → C2H2(g) + 2H2(g), involves the decomposition of ethane (C2H6) into acetylene (C2H2) and hydrogen gas (H2).

To calculate ΔH for this reaction using Hess's Law, we need to consider a series of reactions for which the enthalpy changes (ΔH) are known.

First, we can consider the combustion of ethane, which is an exothermic reaction:

C2H6(g) + 7/2O2(g) → 2CO2(g) + 3H2O(g) ΔH1

Next, we can consider the combustion of acetylene, which is also exothermic:

C2H2(g) + 5/2O2(g) → 2CO2(g) + H2O(g) ΔH2

Lastly, we can consider the combustion of hydrogen gas, which is exothermic as well:

H2(g) + 1/2O2(g) → H2O(g) ΔH3

To obtain the target reaction, we can subtract the known reactions in such a way that the reactants on one side cancel out with the products on the other side. In this case, we need to reverse the second reaction and multiply the third reaction by 2:

2CO2(g) + H2O(g) → C2H2(g) + 5/2O2(g) -ΔH2

2H2O(g) → 2H2(g) + O2(g) 2ΔH3

By adding these reactions together, the intermediate products and reactants cancel out, leaving us with the desired reaction:

C2H6(g) → C2H2(g) + 2H2(g)

The enthalpy change for the desired reaction, ΔH, is the sum of the enthalpy changes for the individual reactions. Therefore:

ΔH = ΔH1 + (-ΔH2) + 2ΔH3

By substituting the known values of ΔH1, ΔH2, and ΔH3, you can calculate the value of ΔH for the reaction using Hess's Law.

In summary, Hess's Law allows us to calculate the enthalpy change for a desired reaction by manipulating known reactions with known enthalpy changes.

By canceling out intermediate products and reactants, we can arrive at the desired reaction and determine its enthalpy change.

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Answer:

Yes, A  toothpick can be a good model for showing the strength and brittleness of salt as It will break and splinter just like salt.

What are the properties of  salt ?

Salts are ionic in nature due to the presence of ions.

They are brittle, hard and crystalline solids.

Salt is white, odorless and it has a salty taste.

Toothpick will break and splinter just like salt, exclamation, because it breaks easy and if we use a hammer on a tooth pick its gonna break and splinter just like salt.

Therefore , A  toothpick can be a good model for showing the strength and brittleness of salt as It will break and splinter just like salt.

Explanation: hope this helps

Answer:

The heat released when the temperature of 60 g of water decreases from 75 degrees Celsius to 27 degrees Celsius is -12,049.92 J.

Explanation:

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is the amount of heat that a body absorbs or releases without any changes in its physical state or phase change. Sensible heat is measured by the expression:

Q = c * m * ΔT

Where Q is the heat exchanged by a body of mass m, constituted by a substance of specific heat c and where ΔT is the variation in temperature.

In this case:

Replacing:

Q= 4.184 \(\frac{J}{g*C}\) *60 g* (-48 C)

Q= -12,049.92 J

The heat released when the temperature of 60 g of water decreases from 75 degrees Celsius to 27 degrees Celsius is -12,049.92 J.

Answer:

2

Explanation:

cause it is what it is :> mark me brainlest

Answer:

A-two

Explanation:

The balanced reaction equation is;

CoBr4 + Al2(SO4)3 → Co(SO4)2 + AlBr3

When we look at an equation, we can tell if the equation is balanced when we look at the number of the atoms that we have on the both sides of the reaction equation such as the one that we have above.

The number of atoms of each element on the reactant side and the number of atoms of each element on the product side must match in order for the chemical reaction equation to be balanced. This is accomplished by changing the coefficients in front of the reactants' chemical formulae.

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Note that the total number of kilojoules required to boil 100 Grams of water at 100°C and 1 atmosphere is 2.26kJ.

The heat of vaporization for water at its boiling point of 100°C is 2260J g-1. This indicates that in order to transform 1 g of water at 100°C to 1 g of steam at 100°C, the water must absorb 2260 J of heat.

Hence, since we are dealing with Kilojoules,

1 Joules = 0.001 Kilojoule; hence,

2260 joules = 2.26kJ

Kilojoules are the units of energy that humans obtain from food and drink (kJ). A calorie is a metric word for energy. Kilojoules and calories are interchangeable terms. A calorie is equal to four kilojoules. Calories may be readily converted to kilojoules and vice versa.

A kiloJoule (kJ) is 1000 Joules, and a megaJoule (MJ) is one million Joules. A related unit is the Watt, which is a power unit. Energy units can be converted to power units by multiplying them by seconds [s], hours [h], or years [yr].

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Answer:

No

Explanation:

No, this is an addition reaction

HC≡CH + 2H-H ----> H3C - CH3

Answer:

Speed =Distance /Time =1000/360=2.78m/s

The molecular version of oxygen is O2. The mass of an oxygen atom is 16 g/mol. The molar mass of oxygen is 32 g/mole (2 x 16). A mole of oxygen will therefore weigh 32 grams.

Experiments on white mice that had been fasted showed that they consumed an average of 37.5 liters of oxygen per kilogram of body weight per day while quiet, comfortable, and awake.

More oxygen is consumed by the smaller mouse per gram per hour. Reduced animals have a smaller surface area to volume ratio, which makes them more susceptible to heat loss to the environment per unit of time. As a result, smaller animals have a different rate of oxygen consumption than larger animals.

This is due to the fact that small animals' higher metabolic rates necessitate increased oxygen delivery to bodily tissues. Additionally, because the surface area to volume ratio is higher in smaller animals, more heat is lost from them

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The number of protons and the number of neutrons determine an  element’s atomic mass: mass number = protons + neutrons.

Atoms of each element contain a characteristic number of protons. In fact, the number of protons determines what atom we are looking at (e.g., all atoms with six protons are carbon atoms); the number of protons in an atom is called the atomic number. In contrast, the number of neutrons for a given element can vary. Forms of the same atom that differ only in their number of neutrons are called isotopes. Together, the number of protons and the number of neutrons determine an element’s mass number: mass number = protons + neutrons. If you want to calculate how many neutrons an atom has, you can simply subtract the number of protons, or atomic number, from the mass number. A property closely related to an atom’s mass number is its atomic mass. The atomic mass of a single atom is simply its total mass and is typically expressed in atomic mass units or amu. By definition, an atom of carbon with six neutrons, carbon-12, has an atomic mass of 12 amu. Other atoms don’t generally have round-number atomic masses for reasons that are a little beyond the scope of this article. In general, though, an atom's atomic mass will be very close to its mass number, but will have some deviation in the decimal places. Since an element’s isotopes have different atomic masses, scientists may also determine the relative atomic mass—sometimes called the atomic weight—for an element. The relative atomic mass is an average of the atomic masses of all the different isotopes in a sample, with each isotope's contribution to the average determined by how big a fraction of the sample it makes up. The relative atomic masses given in periodic table entries—like the one for hydrogen, below—are calculated for all the naturally occurring isotopes of each element, weighted by the abundance of those isotopes on earth. Extraterrestrial objects, like asteroids or meteors, might have very different isotope abundances.

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