The chart shows information gathered as part of the problem-solving process.

2 column chart with 6 rows. Column 1, Category, Students with food allergies, Vegetarian student, Students on other restricted diets, Total number of students needing special diets, Students interested in alternative options, Total number of students at school. Column 2, Number of students, 24, 6, 3, 33, 147, 300.

Based on the chart, what percentage of students at the school need special diets?

33 percent
40 percent
11 percent
20 percent

The valence-shell configuration of the metallic element M in Period 4 is 4s2 4p6.

What is the valence-shell configuration of the metallic element M in Period 4?

The valence-shell configuration refers to the arrangement of electrons in the outermost shell, or valence shell, of an atom. In Period 4, the valence shell of the metallic element M would be the fourth shell, denoted as the 4s and 4p orbitals.

The electron configuration of an element is determined by the position of the element in the periodic table. Since M is in Period 4, we know that it has four electron shells. The valence electrons are those located in the outermost shell, which determine the element's chemical properties and reactivity.

In this case, the valence-shell configuration of M is given as 4s2 4p6, indicating that there are two electrons in the 4s orbital and six electrons in the 4p orbitals. The total number of valence electrons can be calculated as the sum of the electrons in the valence orbitals, which in this case is 8.

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The new pressure of the gas, given that the the gas is taken to a state of volume 5 L and a temperature of 500 °C is 2.94 atm

Let us begin by listing out the given parameters from the question. This is shown below:

Using the combined gas equation as shown below the new pressure of the gas can easily be obtained. Details below:

P₁V₁ / T₁ = P₂V₂ / T₂

(3 × 3) / 473 = (P₂ × 5) / 773

Cross multiply

473 × 5 × P₂ = 3 × 3 × 773

Divide both sides by (473 × 5)

P₂ = (3 × 3 × 773) / (473 × 5)

P₂ = 2.94 atm

Thus, we can conclude the pressure of the gas at the new state is 2.94 atm

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The density of mercury in pounds per cubic inch is 0.49 lb/in³.

Mercury is the only metal that exists in liquid form. The density of mercy is 13.6 g/cm³. It's one of the essential application is in thermometers, especially the ones used in chemistry labs. It is used to measure the temperature of various things. As with the increase in temperature, the mercury present inside the thermometer also increases.

The density of the mercury = 13.6 g/cm³.

1 lb = 2.54 cm

1 lb = 454 g

The density of the mercury in pounds per cubic inch is,

\(13.6 \frac{g}{cm ^{3} } = 13.6 \frac{g}{cm ^{3} } \times \frac{1 \: lb}{454 \: g } \times ({ \frac{2.54}{1 \: in} } ) {}^{3} \)

\(13.6 \frac{g}{cm ^{3} } \times \frac{1 \: lb}{454 \: g } \times ({ \frac{2.54 {}^{3} \: cm ^{3} }{1 ^{3} \: in ^{3} } } )\)

= 0.49 lb/in³

Therefore, the density of mercury in pounds per cubic inch is 0.49 lb/in³.

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Answer:

6.64 x 10^-24  gm

Explanation:

One mole  ( 6.022 x 10^23 atoms)  of Helium = 4.00  gm

4.00 gm / 6.022 x 10^23 = .664 x 10^-23 gm = 6.64 x 10^-24 gm

Answer:

Increasing soil protection by crop residues and plants; adding organic matter to the soil through crop rotations, manures, or crop residues; and careful management of fertilizers, pesticides, tillage equipment, and other elements of the farming system can improve soil quality.

Answer:

Explanation: Over the course of a year, areas near Earth’s equator receive more direct energy from the Sun than areas near Earth’s poles.  Which of the following correctly describes one result of this heating pattern?

I hope it's helpful!!

Answer: four different types!!!!

Explanation:

Photosynthesis is a process of food and energy production by autotrophs. Water and carbon dioxide in the presence of sunlight gives oxygen and sugar.

Photosynthesis is a biochemical reaction that uses organic and inorganic compounds and converts the molecules with the help of biological organs and substances.

The reactant of the process includes atmospheric water vapours, carbon dioxide and the heat and energy from the sun. These reactants are used by plants and some other organisms.

The organism utilizes the reactants and produces molecules of sugar like glucose and by-product oxygen. These molecules are necessary for the metabolic and respiratory processes.

Therefore, option B. \(\rm sunlight + water + carbon\; dioxide \rightarrow oxygen + sugar\) is the correct equation that describes photosynthesis.

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Answer:

The Dog

Explanation:

The more mass something has the more kinetic energy it has in it.

Answer:

c) %5.68×10²⁴

Explanation:

Number atoms=Avogadro's number ₓ number of moles

N= 6.023ₓ 10²³×9.44

N=5.68×10²⁴

Answer:

The three most stable isotopes of hydrogen: protium (A = 1), deuterium (A = 2), and tritium (A = 3).

Protium, the most common isotope of hydrogen, consists of one proton and one electron. ...

A deuterium atom contains one proton, one neutron, and one electron.

Explanation:

An Earth-like exoplanet with active volcanoes and no oceans would have a different atmosphere than that of Earth's. In such a planet, gases like hydrogen and helium will not be as dominant as they are in our solar system.

Rather, the dominant gas in an Earth-like exoplanet's atmosphere with active volcanoes and no oceans would be carbon dioxide. Active volcanoes are a source of carbon dioxide and other greenhouse gases. Therefore, the carbon dioxide that the volcanoes would produce would build up in the planet's atmosphere, increasing its concentration in the atmosphere.

This increase in concentration of carbon dioxide would cause the planet's temperature to rise, making it hotter than Earth. Additionally, the high concentration of carbon dioxide would make the planet's atmosphere denser, resulting in a stronger greenhouse effect. As a result, the planet's surface would be warmer than Earth's.

Therefore, an Earth-like exoplanet with active volcanoes and no oceans would have a carbon dioxide-dominated atmosphere.

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Answer:

Osmosis is the process that describes water moving through a membrane.

I am not sure about the second question.

Explanation:

When a vanadium sample's measured density at room temperature is 6.9 g/cm3, we can infer that there is a 13% inaccuracy in the measurement when compared to the true value of the density (6.1 g/cm3)

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When a vanadium sample's measured density at room temperature is 6.9 g/cm3, we can infer that there is a 13% error in the measurement when compared to the true value of 6.1 g/cm3 (Option C).

Vanadium is found to have a density of 6.9 g/cm3 at room temperature in a laboratory experiment.

Vanadium has a 6.1 g/cm3 density at room temperature, per the literature. The actual value is this.

The following expression can be used to calculate the measurement's percent error.

ε = \(\frac{experimental value - true value }{true value}\)  x 100

Thus when a vanadium sample's measured density at room temperature is 6.9 g/cm3, we can infer that there is a 13% error in the measurement when compared to the true value of 6.1 g/cm3 (Option C).

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Answer: C

Explanation: The evaporation rate depends on the exposed surface of liquid as long as both glasses stay at the same temperature. Since both glasses have the same surface area, they should both evaporate at the same rate.

All of the options listed are required for proposing a valid reaction mechanism. The elementary steps must sum to the overall balanced equation, the steps must be physically reasonable, and the rate law must correlate with the experimental rate law.

To propose a valid reaction mechanism, you should consider the following parameters:

1. Elementary steps sum to overall balanced equation: This ensures that the individual elementary steps add up to form the overall reaction, and the mass and charge are balanced in the process.

2. Physically reasonable elementary steps: The proposed elementary steps should be feasible based on known physical and chemical principles, ensuring that the mechanism is realistic.

3. Correlation of rate law with experimental rate law: The rate law predicted by the proposed mechanism should match the experimentally observed rate law, indicating that the mechanism is consistent with the observed behavior of the reaction.

So, all three parameters are required for proposing a valid reaction mechanism.

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There are different types of Automatic Gain Control (AGC) circuits, which are used to maintain a consistent signal amplitude in electronic devices. The main types of AGC circuits include: linear, nonlinear, Feedforward & Feedback AGC

1. Linear AGC: This type uses a linear voltage-controlled amplifier to control the gain, providing a continuous range of gain adjustments.
2. Nonlinear AGC: This type utilizes a nonlinear voltage-controlled amplifier, resulting in a more rapid gain control response.
3. Feedforward AGC: In this type, the input signal is monitored, and the gain control is adjusted before the signal reaches the amplifier.
4. Feedback AGC: This type uses a feedback loop to measure the output signal and adjust the gain accordingly to maintain a constant output level.
These AGC circuits help in optimizing the performance of various electronic devices by automatically adjusting the signal strength.

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If the hydrogen gas is combusted and produces 645L of water vapor at 400 kelvin and 1.75 atm, 2796.96 g mass of the zinc is produced .

Using the ideal gas law equation:

PV = nRT

n = (PV) / (RT)

= (1.75 atm * 645 L) / (0.0821 atm·L/(mol·K) * 400 K)

= 42.71 moles

the balanced equation for the reaction between zinc and hydrochloric acid:

Zn + 2HCl -> \(ZnCl_{2}\)  + \(H_{2}\)

1 mole of zinc produces 1 mole of hydrogen gas. Therefore, the moles of zinc are also 42.71.

The molar mass of zinc is 65.38 g/mol.

Mass of zinc = moles of zinc * molar mass of zinc

= 42.71 moles * 65.38 g/mol

= 2796.96 g

Therefore, the mass of the zinc is 2796.96 grams.

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The frequency of the wave is found to be 7.05×10¹⁴hertz.

The relation between speed of light, frequency and wavelength is given by,

C= fλ

f=c/λ

f= 3×10⁸/425×10⁻⁹

f=7.05×10¹⁴.

Thus, the frequency of the wave is found to be 7.05×10¹⁴ hertz.

The number of waves that pass a specific place in a given period of time is known as the wave frequency. The hertz (Hz) is the SI unit for wave frequency, and 1 hertz is equivalent to 1 wave crossing a fixed point in 1 second. A wave with a higher frequency has more energy than a wave with a lower frequency of the same amplitude.

A wave’s wavelength is the separation between two adjacent waves’ corresponding points. The Greek letter lambda () is typically used to represent a wave’s length. Wavelength is defined as the product of a wave train’s frequency (f) and speed (v) in a medium.

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Therefore, by measuring the amounts of these isotopes and their decay products in a rock, scientists can calculate its age.

The nuclide that has a half-life of 245,000 years in a sample of uranium-containing rock is thorium-230 (230Th).

Uranium-containing rock is used to date the Earth's age, and thorium-230 is one of the four uranium decay series nuclides that are useful in radiometric dating.

Uranium-238, uranium-235, and lead-207 are the other three nuclides. Thorium-230 has a half-life of 245,000 years, which means that half of the thorium-230 in a sample will decay into other elements in 245,000 years.

The decay series of thorium-230 begins with alpha decay into radium-226, which then undergoes further alpha decay into radon-222 and so on until it reaches lead-206, which is stable.

Uranium-238 decays through a series of alpha and beta decays, eventually producing lead-206, and uranium-235 decays through a similar series, eventually producing lead-207.

Therefore, by measuring the amounts of these isotopes and their decay products in a rock, scientists can calculate its age.

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The volume of the gas at 18.00 ∘C and 0.992 atm is 4.86 L.

To solve this problem, we will use the ideal gas law, which states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.

First, we need to convert the initial temperature to Kelvin by adding 273.15. Therefore, the initial temperature is 287.35 K.

Next, we can calculate the number of moles of gas using the given information. We can rearrange the ideal gas law to solve for n: n = (PV)/(RT). Plugging in the values, we get:

n = (1.50 atm)(3.55 L) / [(0.08206 L·atm/mol·K) (287.35 K)] = 0.194 mol

Now we can use the ideal gas law again to find the final volume. We can rearrange the ideal gas law to solve for V:

V = (nRT)/P

First, we need to convert the final temperature to Kelvin by adding 273.15. Therefore, the final temperature is 291.15 K.

Plugging in the values, we get:

V = (0.194 mol)(0.08206 L·atm/mol·K)(291.15 K) / 0.992 atm = 4.86 L

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Answer:

Nitrogen gas is a homogenous mixture!

Neither a compound nor a combination, nitrogen gas (\(\rm N_2\)) is neither. It is an element.

A pure material made up of just one kind of atom is called an element. When it comes to nitrogen gas, two nitrogen atoms are chemically linked together to form diatomic nitrogen molecules. A compound, on the other hand, is a substance that is created through the chemical fusion of two or more elements in a predetermined ratio. Since there is no chemical link between any other elements and the nitrogen atoms that make up nitrogen gas (\(\rm N_2\)), it is not a complex.

It is crucial to remember that mixes entail the blending of several chemicals, regardless of whether nitrogen gas is homogenous or heterogeneous. Nitrogen gas, on the other hand, is not a mixture either. It is made entirely of identical nitrogen molecules and is a pure material.

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Hello! :)

Noble gases are located in group 8A in the periodic table.

Elements in this group contain 8 valence electrons, making them very stable elements. Some examples of elements in this group include Neon, Argon, and Krypton.

Answer:

mg2+ because it is a very good idea

Answer:

Due to the accumulation of static charges/due to static electricity