If an airplane is traveling 500mi/hr how far can it travel in 4 hours

It will take 33 years for a 40-mg sample to decay to a mass of 30.4 mg.

Tο calculate the time it takes fοr a sample οf strοntium-90 tο decay frοm 40 mg tο 30.4 mg, we can use the cοncept οf half-life

Using the half-life formula:

\(\rm A=A_02^{-t/h}\), where

A = resulting amount after time t = 39.6 mg

Ao = initial amount = 90 mg

t = decay time

h = half-life of substance= 28 yrs

Now putting the values into the formula, we get

\($ \rm 39.6=90\times2^{-t/28}\)

\($ \rm 2^{-t/28}=\frac{39.6}{90}=\frac{2.2}{5}\)

Taking logarithm both sides

\($ \rm ln(2^{-t/28})=ln(\frac{2.2}{5})\)

\($ \rm \frac{-t}{28}ln(2)=ln(0.44)\)

\($ \rm t=\frac{-28ln(0.44)}{ln(2)}\)

t = 33.16389

t ≈ 33years

Thus, it will take 33 years for a 40-mg sample to decay to a mass of 30.4 mg.

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Answer:

Option b which is n equal to 3

However, generally speaking, chloride concentrations in surrounding watersheds can be a concern for aquatic life and the ecosystem.

Concentration refers to the amount of a substance present in a given volume or mass of another substance. It can be expressed in different units, such as mass per volume (e.g., mg/L), moles per volume (e.g., mM), or percentage (%). Concentration is often used to describe solutions, but it can also be used for gases and solids.

Here,

High chloride levels can impact water quality, harm aquatic organisms, and affect the overall health of a watershed. The EPA has established water quality standards for chloride in surface waters to protect aquatic life and human health. The specific concentrations that are considered a concern can vary depending on the location and other factors. It is important to regularly monitor chloride levels in watersheds and take action if they are found to be above safe levels.

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PbCrO4 (s) ↔ \(Pb^{+2}\) (aq) + \(Cr_{4} ^{2}\)- (aq).

Ksp = [\(Pn^{+2}\) (aq)][\(Cr_{4}^{2}\)- (aq)]

7.8 × 10-7 = 0.00055 × [\(Cr_{4}^{2-}\) (aq)]

[\(Cr_{4} ^{2-}\) (aq)] = 1.42 ×\(10^{-3}\) M

What is concentration ?

Concentration in chemistry refers to the quantity of a material in a certain area. The ratio of the solute in a solution to the solvent or whole solution is another way to define concentration. In order to express concentration, mass per unit volume is typically used. The solute concentration can, however, alternatively be stated in moles or volumetric units. Concentration may be expressed as per unit mass rather than volume. Although concentration is typically used to describe chemical solutions, it may be computed for any mixture. Mathematically, concentration is calculated by dividing the mass, moles, or volume of the solute by the mass, moles, or volume of the solution (or, less commonly, the solvent).

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The concentration need to be for a precipitate to occur is 1.42 × 10⁻³ M

The chemical reaction as

PbCrO4 (s) ↔ Pb²⁺  + Cr₄²⁻

Ksp = (Pb²⁺) (Cr₄²⁻)

7.8 × 10-7 = 0.00055 × Cr₄²⁻

Cr₄²⁻ = 1.42 × 10⁻³ M

Hence the concentration for a precipitate to occur is 1.42 × 10⁻³M

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The percentage yield is the same as the theoretical yield. We got it equal to 2.137, which is equal to 85%.

Calculate percentage yield of final product: [Co(NH3)5ONO]Cl2?

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Answer:

A solution in which the maximum amount of solvent has been dissolved. Any more solute added will sit as crystals on the bottom of the container.

Explanation:

Answer:

Migrating farther into the sea

Explanation:

Answer:

Migrating farther into the sea

Explanation:

I aced the test

Answer:

Calcium

Explanation:

It has similar properties as Magnesium (Mg) and Strontium (Sr)

The Atomic number of Calcium (Ca) is 20

The Atomic number of Krypton is 36

The Atomic number of Magnesium is 12

12 < 20 < 36

The higher the boiling point lower will be the vapor pressure. Thus, the correct order of vapor pressure is \(H_{2}O\) < \(CHCL_{2}\) < \(CS_{2}\).

The boiling factor of a substance is the temperature at which the vapor strain of a liquid equals the stress surrounding the liquid and the liquid modifications right into a vapor. The boiling point of a liquid varies depending on the encompassing environmental stress.

The boiling point for any material is the temperature point at which the fabric transforms into the gas segment in the liquid phase. This happens at a hundred ranges centigrade for water. The boiling point of a pure substance is the temperature at which the substance transitions from a liquid to the gaseous segment. At this point, the vapor stress of the liquid is equal to the implemented stress of the liquid. The boiling point at a strain of 1 ecosystem is known as the regular boiling factor.

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When you drop the three objects into a glass of water, the piece of styrofoam will float, the oak will sink, and the gold ring will sink as well.

The reason for this is that the density of the object determines whether it will float or sink. Density is the amount of mass in a given volume, so if an object is more dense than the liquid it is in, it will sink. On the other hand, if the object is less dense than the liquid, it will float.

Styrofoam is made up of mostly air, which makes it less dense than water, so it floats. Oak, however, is more dense than water, so it sinks. Gold is a dense metal, so it also sinks. This principle is important in understanding buoyancy, which is the force that causes objects to float or sink in a fluid. Understanding density and buoyancy is important in various fields, including engineering and physics.

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As the reaction between the two gases proceeds, the volume of the container will decrease due to the formation of a new gas, XY, which takes up less space than the two gases combined.

In a closed system, the decrease in volume is accompanied by an increase in pressure, as the molecules of XY have less space to move around in than the molecules of X and Y.

This is because the increased pressure will cause the molecules to move faster, thereby increasing the kinetic energy of the system. This increase in temperature will cause the reaction to speed up, leading to more molecules of XY being formed. As the reaction continues, the pressure, temperature, and volume will continue to change in a dynamic equilibrium until all the reactants are used up.

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Answer:

Ionic compound

Explanation:

Lithium gives away an electron and Bromine takes an electron

Hope this helps! :)

Answer:

3.60

Explanation:

To calculate the pH of any solution, use the formula;

pH= -log[ concentration ] and for this case take pH= -log[H3O+]

= -log[2.5x10^-4]

therefore pH= 3.60

The idea of pH mainly applies in the determination of the nature of various solutions to the used in the chemical analysis. The correct pH must be determined in order to get accurate results. Ionic equillibria mostly involves the calculations involving pH which is normally obtained after determination of equilibrium concentrations.

The moles of ammonia present in a 2.860 g sample of ammonia has a molar mass of 17.030 g/mol. Then, the Number of Moles is 0.2 moles.

Ammonia :

Ammonia is an inorganic compound of nitrogen and hydrogen with the chemical formula NH3. A stable binary hydride and the simplest source of hydrogenation, ammonia is a colorless gas with a distinct, pungent odor. Biologically, it is a common nitrogen waste, especially among aquatic organisms, and contributes significantly to the nutrient needs of terrestrial organisms, serving as a precursor to 45% of the world's food and fertilizers.

Molar Mass:

In chemistry, the molar mass (M) of a compound is defined as the ratio between the mass of a sample of that compound and the amount of the substance (measured in moles). Molar mass is a volumetric, not molecular, property of a substance. Molar mass is the average of many instances of a compound that often differ in mass due to the presence of isotopes. Most commonly, molar mass is calculated from standard atomic weights, so it is global average and is a function of the relative isotopic abundance of Earth's constituent atoms. Molar mass is suitable for converting the mass of a substance and the amount of a substance into a mass quantity.

Now,

Given:

Weight in grams, w = 2.860 g

Molar mass, m = 17.030 g/mol

We know,

Number of Moles = Weight(w) / Mole Mass (m)

    ⇒                    n   =  2.860/ 17.030

 By substituting the values,

    ⇒                    n   = 0.1679

                         ≈ n   = 0.2 moles.            

Thus, the response above is right.

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Answer:

even though the particles of a liquid are moving, they are attracted to each other so they don't spread far apart to become a gas.

Explanation:

"but some do when they evaporate"

In liquids, the particles are allowed to move freely rather than the solid. The gaseous particles can move more freely than liquids.

In liquids, the particles are placed randomly and thus are allowed to move freely but they do not become a gas as liquids are slightly less compressible than gases.  Even though the particles of a liquid are moving, they are attracted to each other so they don't just spread far apart to become a gas.

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Freezing temperature is the temperature at which a liquid turns into a solid. For different liquids or substances the freezing temperature will be different.

In the case of water the freezing point is 0° Celsius. When you convert the 0° Celsius into Fahrenheit, it is 32° Fahrenheit.

At this temperature the water will turn into ice. But we have consider this also that the freezing temperature of other substances can be different.

When we consider other liquids or substances, we can see for example ethanol (alcohol) have the freezing temperature of -114° Celsius (-173° Fahrenheit). Freezing temperature of mercury is -38° Celsius (-37° Fahrenheit).

To convert from Celsius to Fahrenheit,

C = 5/9 (F - 32)

F = (9/5 × C) + 32

C ⇒ Temperature in Celsius.

F ⇒ Temperature in Fahrenheit.

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The correct option from the given statements concerning mixtures is (d) more than one correct response.

The statement (a) "The composition of a homogeneous mixture cannot vary" is incorrect as the composition of a homogeneous mixture can vary. For example, a mixture of salt and water is homogeneous and its composition can vary depending on the amount of salt and water mixed in it.

The statement (b) "A homogeneous mixture can have components present in two physical states" is correct. Homogeneous mixtures are mixtures that are uniform throughout their composition, meaning that there is no visible difference between the components of the mixture. For example, a mixture of ethanol and water is homogeneous and its components are present in two physical states (liquid and liquid).

The statement (c) "A heterogeneous mixture containing only one phase is an impossibility" is incorrect. A heterogeneous mixture is a mixture where the components are not evenly distributed and the mixture has different visible regions or phases. However, it is possible for a heterogeneous mixture to contain only one phase. For example, a mixture of oil and water is heterogeneous but can have only one phase.

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Answer:

Hello

Explanation:

Common salt is obtained from sea-water by the process of evaporation. Sea water is trapped in large, shallow pools and allowed to stand there. The sun's heat evaporates the water slowly and common salt is left behind.

This impure common salt obtained has impurities and is hence purified to obtain pure common salt by recrystallization.

Answer:

hey, I hope this helps

Explanation:

salts can broadly be said as the product formed from neutralizing an acid, where a metal atom or positively charged radical replaced one or more of the acid's hydrogen atom

The volume of dry hydrogen gas at standard atmospheric pressure (which is typically defined as 1 atm or 101.325 kPa) depends on the number of moles of hydrogen gas present. The ideal gas law, PV = nRT, relates the pressure (P), volume (V), number of moles (n), and temperature (T) of an ideal gas. Assuming standard temperature and pressure (0°C and 1 atm), one mole of any ideal gas occupies a volume of 22.4 L. Therefore, to find the volume of dry hydrogen gas at standard atmospheric pressure, we need to know how many moles of hydrogen gas we have.

For example, if we have 1 mole of dry hydrogen gas at standard atmospheric pressure, the volume would be 22.4 L. If we have 0.5 moles of dry hydrogen gas, the volume would be 11.2 L. And so on.

Answer:

Option a. is correct.

Explanation:

Gas exchange refers to the the elimination of carbon dioxide from the bloodstream to the lungs and delivery of oxygen from the lungs to the bloodstream. The actual gas exchange happens in the lungs between the alveoli and capillaries (a network of tiny blood vessels). Capillaries are located in the walls of the alveoli.

Answer:

the correct answer is lost of jobs,higher taxes, and elimination of tourist activities

Explanation:

hope you have a blessed day:)

Answer:

the correct answer is lost of jobs,higher taxes, and elimination of tourist activities

Explanation:

thank you for the answer i hope EVERYONE has A BLESSED DAY!!!!!!!!!!!!!!!!!!!!!!

DNA is found mainly in the nucleus of the cell, while Ribonucleic Acid RNA is found mainly in the cytoplasm of the cell although it is usually synthesized in the nucleus.

The time taken to deposits one mole of silver if a current of 6 ampere is passed through the silver trioxonitrate solution is 16083 seconds or 283 minutes.

Electrolysis is the process of converting electrical energy into chemical energy.  If current is passed between two electrodes which are immerse in an electrolyte solution, the metal which is reduced will deposited at the cathode.

The weight of the deposited metal w related with its equivalent weight z, current I and time t is :

w = zIt /96500.

One mole of silver is 108 g. Its equivalent weight also be 108 g Thus the time t is calculated as follows:

108 g = 108 × 6 × t /96500

      t = 96500/6

        = 160835 seconds or 268 minutes.

Hence, the time taken to deposits one mole of silver in this electrolysis is 268 minutes.

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Answer:

Carbon

Explanation:

The way to identify an element is by looking at the number of protons the atom has.  Every element has its own atomic number.  This atom has 6 protons.  If you look at the periodic table, you can see that the atom with the atomic number of 6 is carbon.

As the atom has six protons in it's nucleus, the atom is a form of  element of carbon.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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Answer:

Ye,,it is true that Mars is bigger than mercury.

Explanation:

Actually,Mercury is the smallest planet in the solar system.

Answer:

may be the first one is a producer

Answer:

2nd law

Explanation:

newtons second law states that the force F acting on a body is equal to the mass m of the body multiplied by the acceleration a of its center of mass.

I'm pretty sure we have the same class (I go to FL), because I have the same problem, and it was assigned the day you posted this, so I can't give a full answer but important things would be conducting electricity, solubility, flexibility, shape, and geometries. Sorry I can't be of more help!