Predict the product of the following reaction, then balance the equation.
Mg (s) + O2(g) →

The man can survive in the elevator for approximately 4.34 minutes.

Surface area of a man = 1.7 m^2

Dimensions of elevator = 1 m x 1 m x 2 m

Heat released from Oxygen is 4.83 kcal/litre.

We know that the man needs oxygen to survive. Oxygen makes 20% of air and heat released from Oxygen is 4.83 kcal/litre.Let the volume of the elevator be V = 1 m x 1 m x 2 m = 2 m^3. The volume of air in the elevator will also be 2 m^3.To calculate the volume of oxygen in the air, we need to multiply the volume of air by the percentage of oxygen in the air.20% of 2 m^3 = 0.4 m^3

This is the volume of oxygen in the air. To calculate the mass of oxygen in the air, we need to multiply the volume of oxygen by the density of oxygen.The density of oxygen is 1.429 kg/m^3.Mass of oxygen in the air = Density x Volume= 1.429 kg/m^3 x 0.4 m^3= 0.5716 kg

This is the mass of oxygen available in the elevator for the man to breathe.We know that the man uses oxygen to breathe and releases heat in the process. The heat released from Oxygen is 4.83 kcal/litre. The man needs 5 litres of Oxygen per minute to survive.

Therefore, he will release 4.83 x 5 = 24.15 kcal of heat per minute.To calculate the time the man can survive in the elevator, we need to calculate the total heat in the elevator. The specific heat capacity of air is 1.005 kJ/kg K (or 0.24 kcal/kg K).Therefore, the heat capacity of air in the elevator = mass of air x specific heat capacity x change in temperature= 1.2 kg x 0.24 kcal/kg K x (35°C - 25°C)= 2.88 kcal/°C

The initial temperature of the air is 25°C and the final temperature is 35°C. The total heat in the elevator can be calculated as follows:Total heat = Heat capacity x Change in temperature x mass of air= 2.88 kcal/°C x 10°C x 1.2 kg= 34.56 kcal

Therefore, the man can survive in the elevator for:

Time = Total heat released by man/Total heat in the elevator= 150/34.56= 4.34 minutes (approx)

The man can survive in the elevator for approximately 4.34 minutes.

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Answer:

Warmer air can hold more water vapor than colder air.

Explanation:

Weather can be defined as the atmospheric conditions of a particular area over a short period of time.

The elements of weather include precipitation, wind, temperature, atmospheric pressure, relative humidity, cloud, and wind speed.

Temperature can be defined as a measure of the degree of coldness or hotness of a physical object (body).

On the other hand, humidity refers to the concentration (amount) of water vapor that is present in the air. It is high when there's a lot of water vapor in the air and low when the level of water vapor is small.

The relationship between air temperature and humidity is that warmer air can hold more water vapor than colder air because as the air cools, its molecules move closer together while the molecules move farther apart as the air become hot.

Additionally, at constant humidity, relative humidity is inversely proportional to temperature i.e as the temperature decreases, relative humidity increases.

Answer:

a. pH → 8.12

b. pH → 10.55

c. pH → 8.38

Explanation:

In this excersise, the first two salts come from a strong base and a weak acid, so the anion will make hydrolisis that can help us, to determine pH.

The  NH₄ClO₄ comes from a weak acid and a weak base. This is an special case.

a. KNO₂ →  K⁻  +  NO₂⁻

NO₂⁻  +  H₂O  ⇄  HNO₃  +  OH⁻        Kb = 1.41×10⁻¹¹

Kb = x² / (0.12 - x)

We can avoid the x in denominator because Kb it is a very low value. This expression is reduced to:

[OH⁻] = √(Kb . 0.12)

[OH⁻] = √(1.41×10⁻¹¹ . 0.12)  = 1.30×10⁻⁶ M

- log [OH⁻] = pOH → - log 1.30×10⁻⁶  = 5.88

14 - pOH = pH → 14 - 5.88 = 8.12

b. NaOCl  →  Na⁻  +  OCl⁻

OCl⁻  +  H₂O  ⇄  HClO  +  OH⁻        Kb = 3.33×10⁻⁷

The same as before, we avoid the x in denominator because Kb it is a very low value.

[OH⁻] = √(Kb . 0.37)

[OH⁻] = √(3.33×10⁻⁷ . 0.37)

[OH⁻] = 3.51×10⁻⁴ M

- log 3.51×10⁻⁴ = 3.45 → pOH

14 - 3.45 = 10.55 → pH

c. NH₄ClO₄ → NH₄⁺  +  ClO⁴⁻

Both ions can make hydrolisis in water. Ammonium can give ammonia and the hypochlorite makes hypochlorous acid.

NH₄⁺  +  H₂O  ⇄  NH₃  +  H₃O⁺      Ka = 5.7×10⁻¹⁰

OCl⁻  +  H₂O  ⇄  HClO  +  OH⁻        Kb = 3.33×10⁻⁷

The reduced expression to calculate pH for this sort of salts, is to make the square root of the product between the Ka constant.

As we have Kb for the HClO, we need to determine the Ka

Kw = Ka . Kb   →  Kw/Kb = Ka → 1×10⁻¹⁴ / 3.33×10⁻⁷ = 3×10⁻⁸

[H₃O⁺] = √(5.7×10⁻¹⁰ . 3×10⁻⁸) = 4.14×10⁻⁹ M

- log [H₃O⁺] = pH → - log 4.14×10⁻⁹ = 8.38

As per the calculations of the pH the solutions of 0.12 M KNO2 and 0.37 M NaOCl and the 0.39 M NH4ClO4 web assign have been made with a significant check on the figures.

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Answer:

D because electron is negatively charge around the nucleus

electrons are found outside the nucleus

An atoms is composed of electrons, protons and neutrons. Protons and neutrons are attached within the nucleus whereas electrons are in the cloud around the nucleus. Thus, option D is correct.

Atoms are the basic units of every substance. Atoms are composed of subatomic particles electrons, neutrons and protons.  Protons and neutrons are located inside the nucleus where as electrons are revolving around the nucleus.

The core of an atom is called nucleus. The protons are positively charged and the neutrons are neutral. Electrons are negatively charged particles and they are revolving around the nucleus through circular paths of fixed energy called orbits.

The region where we can find an electron inside an atom is called an orbital. Electrons experience an attractive pull  from the positively charged nucleus and thus electrons are existing in a cloud of electrostatic force around nucleus.  

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Answer:

8.677

⋅

10

8

g

Explanation:

The dissociation equation for weak acid can be written as HB + H2O ⇌ H3O+ + B- and there will be no change in Poh at all.

The correct answer is option D.

When a stress is given to an equilibrium system, the system will move to  offset the stress and reestablish equilibrium, according to Le Chatelier's principle.    In this situation, adding a  bitsy  volume of the weak base B- to the  result will raise the  attention of B- in the  result.

This indicates that the equilibrium will move to the left to  neutralize the rise in B-  attention, performing in a drop in H3O ion  attention.   Because pH measures the  attention of H3O ions in a  result, a reduction in H3O  attention will affect in a rise in pH. As a result, the answer is pH slightly rises; pOH slightly falls.

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Answer:

kinetic energy

Explanation:

Thermal Energy, Temperature, and Heat. Thermal energy is kinetic energy associated with the random motion of atoms and molecules.

Explanation:

I don't no the answer I hope you plzzzzzzzzzzzzzzzzzz tell me the answer

Answer:

Sucrose to is the substrate of the reaction because is a simple sugar( disaccharide) which produce glucose and fructose in the presence of sucrase or when it is hydrolysed.

Answer:

It won't be good.

Explanation:

In the core of the sun, hydrogen is produced by nuclear fusion. when the sun ages, it starts to run out of the hydrogen. when it runs out, nuclear fusion can't generate heat, and then the sun expands, becoming a red giant.

The balanced nuclear equation for the nuclear fission of 235U into 92Kr and 141Ba can be written as follows:

235U + 1n → 92Kr + 141Ba + 2(1n)

In this equation, a neutron (1n) collides with a uranium-235 (235U) nucleus, resulting in the fission of the uranium nucleus. The fission products are krypton-92 (92Kr) and barium-141 (141Ba), along with the release of two additional neutrons. It is important to note that the equation represents a simplified representation of nuclear fission, and the actual process involves a complex series of reactions and the release of additional particles and energy.

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Answer:

Sediment moves from one place to another through the process of erosion. Erosion is the removal and transportation of rock or soil. Erosion can move sediment through water, ice, or wind. Water can wash sediment, such as gravel or pebbles, down from a creek, into a river, and eventually to that river's delta.

Explanation:

Erosion refers to the washing away or the removal of top soils/rocks by agents such as water, wind, etc.

Erosion is the removal of topsoils or rocks by agents of erosions. These agents include water, wind, waves, and ice.

In water/ice erosion, topmost soils or rocks are washed away and deposited somewhere else, usually in or at the mouth of nearby water bodies.

Wind erosion carries soils/rocks and deposits them somewhere else. The deposition accumulates over a period of time to form different landforms.

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Answer:

actually it depends on when and on what you had the finger print it could stay a couple of days, weeks or months and still be considered fresh

Answer:

380

Explanation:

Q=mco

Q is the energy

M is mass

C is specific heat

O is increased in temperature

The mixture contains a concentration of monoprotic acetic acid of

(8.36 M). (0.0083592 mol/1000 mL = 8.36 M) = 0.258 M x 32.40 mL/1000 L.

Monoprotic acids include benzoic acid (C6H5CO2H), acetic acid (CH3CO2H or HOAc), nitric acid (HNO3), and hydrochloric acid (HCl).

H2SO4 and H3PO4 are examples of polyprotic acids that contain two or three hydrogen ions. Although it is alluring to believe that polyprotic acids are more powerful than monoprotic acids since they include several hydrogen ions, this is not the case.

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Answer:

C. Solid in liquid

Explanation:

Seawater is an example of a solid in liquid solution.

Sea water is made up of:

A liquid solution is always made up of a solute being dispersed within the solvent medium.

The solvent is the liquid or fluid medium.

Such solutions are homogeneous because the solute particles are distributed evenly or uniformly in the solvent.

The solute is usually present in smaller amount compared to the solvent.

Answer:

Warm equatorial air rises higher into the atmosphere and migrates toward the poles. This is a low-pressure system. At the same time, cooler, denser air moves over Earth's surface toward the Equator to replace the heated air. ... This happens because Earth's rotation generates what is known as the Coriolis effect

Answer:

in the explanation is my answer

Explanation:

Chemical Energy

Chemical Energy is energy stored in the bonds of atoms and molecules. Batteries, biomass, petroleum, natural gas, and coal are examples of stored chemical energy. Chemical energy is converted to thermal energy when we burn wood in a fireplace or burn gasoline in a car's engine.

Answer:

sugar i believe

Explanation:

According to the ideal gas law, the volume of 4.5 moles a gas that is kept at Standard Atmospheric Pressure (1 atm) and 298 K is 11,149.074 L.

The ideal gas law is a equation which is applicable in a hypothetical state of an ideal gas.It is a combination of Boyle's law, Charle's law,Avogadro's law and Gay-Lussac's law . It is given as, PV=nRT where R= gas constant whose value is 8.314.The law has several limitations.

Substituting the values in the above equation V= 4.5×8.314×298/1=11,149.074 L.

Thus, the volume of 4.5 moles a gas that is kept at Standard Atmospheric Pressure (1 atm) and 298 K is 11,149.074 L.

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The pressure of the hydrogen gas formed is given by its partial pressure at

the given temperature.

The pressure of the hydrogen gas formed is approximately 717.38 mmHg.

Reasons:

The pressure of the hydrogen gas formed is given by the difference

between the vapor pressure of the gas collected and the vapor pressure of

water.

The vapor pressure of water at 24.0 °C is given by the Clausius-Clapeyron

Equation as follows;

\(ln \left(\dfrac{P_2}{P_1} \right) = \dfrac{\Delta H_{vap}}{R} \cdot \left(\dfrac{1}{T_1} - \dfrac{1}{T_2} \right)\)

Where;

P₁ = The partial pressure at temperature, T₁

P₂ = The pressure at temperature, T₂

We get;

\(ln \left(\dfrac{P_2}{23.8 \ mmHg} \right) = \dfrac{44,000 \ J/mol}{8.3145 \ J/(mol \cdot K)} \cdot \left(\dfrac{1}{298 \ K} - \dfrac{1}{297.15 \ K} \right)\)

The pressure of water at 24.0 °C, P₂ ≈ 22.62 mmHg

The vapor pressure of water at 24.0°C is 22.62 mmHg

Therefore;

The pressure of the hydrogen gas formed ≈ 740.0 mmHg - 22.62 mmHg = 717.38 mmHg

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Answer:

The outer core, about 2,200 kilometers (1,367 miles) thick, is mostly composed of liquid iron and nickel. The NiFe alloy of the outer core is very hot, between 4,500° and 5,500° Celsius (8,132° and 9,932° Fahrenheit)

Explanation:

Answer:

Earth's outer core is a fluid layer about 2,400 km thick and composed of mostly iron and nickel that lies above Earth's solid inner core and below its mantle.

Explanation:

Answer: XCl2(aq) + 2 AgNO3(aq) ---> X(NO3)2(aq) + 2 AgCl(s)

Explanation:

Hehe I remembered how...

Answer:

Sublimation is the process from a solid directly into a gas. The particles of a solid absorb enough energy to completely overcome the force of attraction between them. Solid carbon dioxide changes directly to the gaseous state. Therefore the state from soiid and gas can be observed.

Explanation:

Hope this helps! <3

The molar concentration of a 12% sodium chloride solution is approximately 2.05 M.

To determine the molar concentration of a 12% sodium chloride solution, we need to convert the given percentage concentration into molarity.

First, we need to understand that the percentage concentration refers to the mass of the solute (sodium chloride) relative to the total mass of the solution.

In this case, a 12% sodium chloride solution means that there are 12 grams of sodium chloride in 100 grams of the solution.

To convert this into molar concentration, we need to consider the molar mass of sodium chloride, which is 58.5 g/mol.

We can start by calculating the number of moles of sodium chloride in 12 grams:

Moles of sodium chloride = mass of sodium chloride / molar mass of sodium chloride

Moles of sodium chloride = 12 g / 58.5 g/mol = 0.205 moles

Next, we calculate the volume of the solution in liters using the density of the solution. Since the density is not provided, we assume a density of 1 g/mL for simplicity:

Volume of solution = mass of solution / density

Volume of solution = 100 g / 1 g/mL = 100 mL = 0.1 L

Finally, we calculate the molar concentration (Molarity) by dividing the number of moles by the volume in liters:

Molar concentration = moles of solute / volume of solution

Molar concentration = 0.205 moles / 0.1 L = 2.05 M

Therefore, the molar concentration of a 12% sodium chloride solution is approximately 2.05 M.


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Here's the code for the first task using range-based for loop:

c++

Copy code

const int SIZE = 1024;

int foo[SIZE];

int sum = 0;

// initialize foo array with values

for (int i = 0; i < SIZE; i++) {

   foo[i] = i;

}

// sum the values using a range-based for loop

for (int val : foo) {

   sum += val;

}

std::cout << "The sum of the array is: " << sum << std::endl;

Here's the code for the second task using a regular for loop:

c++

Copy code

const int SIZE = 2000;

double foo[SIZE];

double sum = 0.0;

// initialize foo array with values

for (int i = 0; i < SIZE; i++) {

   foo[i] = i * 1.5;

}

// sum the odd elements using a for loop

for (int i = 0; i < SIZE; i++) {

   if (i % 2 != 0) {  // check if the index is odd

       sum += foo[i];

   }

}

std::cout << "The sum of the odd elements in the array is: " << sum << std::endl;

In this example, we first initialize the foo array with some values. Then we iterate over the array using either a range-based for loop or a regular for loop. In the range-based for loop, we use a range-based syntax to iterate over each value in the array. In the regular for loop, we use an index variable to access each element of the array. Inside the loop, we check if the index is odd and add the corresponding value to the sum variable. Finally, we print the result to the console.

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of water can be electrolytically broken down to yield 5 moles or oxygen gas. 1.64x1023 = 1677.72 if 1.64 moles or sodium chloride were produced.

A mole (6.021023 typical particles) of the any gas takes up 22.4L at STP (figure below). A comparison of various gases' molar volumes is shown in the image below. At STP, there exist samples containing helium (He), nitrous (N2), or methane (CH4). Each has a mole content of 1 or 6.02 1023 particles.

1.64x1023 = 1677.72

if 1.64 moles or sodium chloride were produced

One mole of the a material is equivalent to 6,022 x 1023 molecules of that substance.  The Avogadro number, also referred to as the Avogadro constant, is 6.022 x 1023. The definition of a mole can be used to the conversion between mass and particle count.

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Answer: true i think tell me if im wrong

The number of atoms equals 4.6 which are present in a 24.56 g sample of sulfur.

Equation:

The first step in calculating the number of atoms is to determine the number of moles. To get the number of moles in an element or compound, divide the supplied mass by the element or compound's molar mass. The number of atoms in 1 mole of a substance is 6.023 10 23.

The stated mass is 24.56 g M, and the molar mass of sulphur is 32.065 g/mole.

n = m / M

n = 24.56 / 32.065

n=0.76 moles.

The number of atoms in 1 mole of a substance is 6.023 10 23.

Number of atoms for 0.76 moles equals n * Na

number of atoms equals 0.76 moles * 6.023 10 23 atoms

number of atoms equals 4.6

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