HELP ME !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Explanation

To find the molar mass of sulfur dihydride, you will need to find the sum of all the atomic masses making up sulfur dihydride.

sulfur dihydride is H2S.

Atomic mass of H = 1,00784 u

Atomic mass of S = 32,065 u

Molar mass = (1.00784 x 2) + 32,065 = 34.081 g/mol

Answer

34.081 g/mol

Explanation:

density = mass/volume so volume = mass/density = 40/4.30

They cannot be divided and still keep the properties of the element; option D.

The elephant have the greatest mass; option A

Atoms are the smallest particle of an element that can take part in a chemical reaction.

Atoms of the same element have the same atomic number or the same number of protons.

Atoms of elements cannot be divided and still keep the properties of the element.

The atoms of calcium, gold, argon, iodine will have the following features in common: they cannot be divided and still keep the properties of the element; option D.

Mass of a substance is the amount of matter present in that substance.

The elephant will have the greatest mass of the other animals.

In conclusion, atoms are the smallest particle of a substance that can take part in a reaction.

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\(\boxed{\sf Molarity=\dfrac{Moles}{Vol\:in\:L}}\)

Moles of CaCO_3:-

Come to formula stated first

\(\\ \tt\Rrightarrow Volume=\dfrac{Moles}{Molarity}\)

\(\\ \tt\Rrightarrow volume=\dfrac{0.008}{0.4}\)

\(\\ \tt\Rrightarrow volume=0.02\ell=20m\ell\)

75.83 grams of KNO3 are required to prepare a 0.50 M solution in 1.50 L of water.

To prepare a 0.50 M solution of KNO3 in 1.50 L of water, we can determine the amount of KNO3 required by using the formula:

Molarity (M) = moles of solute / liters of solution

Rearranging the formula, we can calculate the number of moles of KNO3:

moles of KNO3 = Molarity x liters of solution

Given the values, we find:

moles of KNO3 = 0.50 M x 1.50 L = 0.75 moles

To find the mass of KNO3 needed, we need to use its molar mass:

molar mass of KNO3 = 101.10 g/mol

Therefore, the mass of KNO3 required is:

mass of KNO3 = moles of KNO3 x molar mass of KNO3

Substituting the values, we obtain:

mass of KNO3 = 0.75 moles x 101.10 g/mol = 75.83 g

Hence, to prepare a 0.50 M solution in 1.50 L of water, you would need 75.83 grams of KNO3.

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Answer:

I dont get what you need help with

Explanation:

Answer:

i dont get what your supposed to do either

Answer:

A. Temperature or Pressure

Explanation:

Explanation:

1. cryolite

2. cell

3. bauxite

4.

5.

6.

7.

8.

9. replaced

this is all I know. I'm sorry I could not answer all

The correct answer is increases, increases.

Solid, liquid, and gas solubility:

Changes in pressure hardly ever affect the solubility of solids or liquids. However, gases are highly reliant on the system's pressure. Liquids and gases combine to generate solutions.

The solubility of the molecule increases as the number of hydroxyl groups increases since there will be more hydrogen bonding as a result.

As the number of carbon atoms rises, alcohol's solubility decreases since the carbon chain is hydrophobic by nature. The hydrophobic group expands as the molecule's polarity decreases. As a molecule's polarity rises, its solubility gradually declines.

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The element that is most likely to pair with beryllium in a 1:1 relationship based on valence electron trends would be Se ( 6 valence electrons ). That is option A.

Valence electron is defined as the electron of an atom that is located at the outermost shell which takes part in formation of chemical bonding during a chemical reaction.

The number of Valence electron of the element beryllium = 2

The number of Valence electron of the selenium = 6

Therefore, both beryllium and selenium can form a chemical bond in a 1:1 relationship based on valence electron trends as both will complete their outer most shell into 8 electrons.

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The answer is e. Y (yttrium) has the smallest number of unpaired electrons in the ground state, with zero unpaired electrons.

Fe2 (iron) has four unpaired electrons, Pd4 (palladium) has two unpaired electrons, Cr3 (chromium) has three unpaired electrons, and Tc4 (technetium) has four unpaired electrons.

Based on the given options, element Y (yttrium) has the smallest number of unpaired electrons in its ground state.

Yttrium (Y) has an atomic number of 39, which corresponds to an electron configuration of [Kr] 5s² 4d¹. In this configuration, Y has only one unpaired electron. In comparison, the other options have more unpaired electrons in their ground states.

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The answer is e. Y (yttrium) has the smallest number of unpaired electrons in the ground state, with zero unpaired electrons.

Fe2 (iron) has four unpaired electrons, Pd4 (palladium) has two unpaired electrons, Cr3 (chromium) has three unpaired electrons, and Tc4 (technetium) has four unpaired electrons.

Based on the given options, element Y (yttrium) has the smallest number of unpaired electrons in its ground state.

Yttrium (Y) has an atomic number of 39, which corresponds to an electron configuration of [Kr] 5s² 4d¹. In this configuration, Y has only one unpaired electron. In comparison, the other options have more unpaired electrons in their ground states.

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Answer:

°C÷5= (°F-32)÷9

Explanation:

Just apply the given formula above. Substitute 175 in place of °F then solve the equation

The temperature of 175 °Fahrenheit in degrees Celsius is 79.4 °Celsius.

Temperature is the degree to which a thing is hot or cold. Temperature is a measure of a system's average kinetic energy. As particles in a substance travel faster, their kinetic energy increases, raising the temperature of the system. Heat is defined as the energy exchanged when two bodies of differing temperatures come into contact. Temperature is a quantity that indicates a body's thermal condition (i.e., the degree of hotness or coldness of the body). When two bodies of differing temperatures come into touch, it defines the direction of heat transfer.

Here,

The temperature of hot water in degrees Celsius can be calculated by using the formula:

C = (F - 32) * (5/9)

where C is the temperature in degrees Celsius and F is the temperature in degrees Fahrenheit.

Plugging in the given temperature of 175 ∘F, we get:

C = (175 - 32) * (5/9)

C = 143 * (5/9)

C = 79.44∘C

So, the temperature of the hot water in degrees Celsius is approximately 79.44 ∘C.

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Answer:

C , They taste sour

Answer:

They taste sour

Explanation:

I know it's late but i couldnt help it i just took the test

A polymer-based material can be characterized using various techniques and instruments.

Here's how to determine whether the polymer is a thermoset, the amount of filler present in it, what the filler is, and the quantity of antioxidants and UV absorbents present:

1. To determine if the polymer is a thermoset, heat it. Thermosets don't melt, but thermoplastics do.

2. To determine the amount of filler in the polymer, weigh a sample of the polymer and then burn it. The residue will be the filler. Subtract the residue's mass from the polymer's initial weight to determine the filler's weight.

3. To determine what filler is present, observe the residue after burning.

4. UV absorbents can be detected using UV-Vis Spectroscopy, while antioxidants can be determined using FTIR Spectroscopy.

5. To determine if the material has dye or pigment coloring, use colorimetry to measure its color, then compare it to the reference color of the polymer. If the color is different, it has dye or pigment coloring.

6. The polymer's thermoset can be identified using Differential Scanning Calorimetry (DSC) to examine the melting temperature, which is unique to each thermoset.

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Since this is a single replacement reaction, the equation for the reaction is:

\(\text{Mg}+\text{H}_{2}\text{SO}_{4} \longrightarrow \text{MgSO}_{4}+\text{H}_{2}\)

From this, we know that for every mole of magnesium consumed, 1 mole of hydrogen is produced.

The atomic mass of magnesium is 24.305 g/mol, so 72 grams of magnesium is 72/24.305 = 2.9623534252211 moles.

This means we need to find the mass of 2.9623534252211 moles of hydrogen.

Hydrogen has an atomic mass of 1.00794 g/mol, so doubling this to get the formula mass of of \(\text{H}_{2}\), we get 2.01588 g/mol, which his a mass of:

(2.01588)(2.9623534252211). which is about 5.97 g

The change in internal energy for the system is -19.8 kJ.

To calculate the change in internal energy (ΔU) for the system, we need to consider the heat transferred (q) and the work done (w) by the system.

q = -35.8 kJ (negative value indicates heat being given off by the system)

ΔV = 16 L - 8 L = 8 L (change in volume)

P = 2 atm (constant pressure)

To calculate the work done (w), we can use the equation w = -PΔV, where P is the pressure and ΔV is the change in volume. Substituting the given values, we have:

w = -(2 atm)(8 L) = -16 L·atm

The change in internal energy (ΔU) is calculated using the equation ΔU = q - w. Substituting the given values:

ΔU = (-35.8 kJ) - (-16 L·atm) = -35.8 kJ + 16 L·atm

Now we can calculate the change in internal energy:

ΔU = -35.8 kJ + 16 L·atm = -19.8 kJ

Therefore, the change in internal energy for the system is -19.8 kJ. The negative sign indicates that the internal energy of the system has decreased as it gave off heat and did work in expanding against the constant pressure.

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Answer:

The K type thermocouple is used in the test to measure the temperature, especially in the burning chamber..

Two thermometers need to be used during the smoking process. One thermometer measures the air temperature of the smoker. The other thermometer is used to monitor the food product temperature..

Explanation:

Hope it helps you..

J-just correct me if I'm wrong, okay?..(;ŏ﹏ŏ)

B-but..

Y-your welcome in advance!!..

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Answer:

3NH4OH +  H3PO4  -----> (NH4)3PO4 +  3H2O

Explanation:

L.H.S

3NH4OH +  H3PO4

R.H.S

(NH4)3PO4 +  3H2O

Answer:

1.57694 L

Explanation:

To convert from mL to L, you simply divide the value by 1000.

Answer:

Cilindros graduados

Explanation:

Son una herramienta de medición primaria para el volumen de un líquido, y tiene varias marcas hacia arriba y hacia abajo a lo largo del contenedor con incrementos específicos. Los cilindros graduados vienen en muchos tamaños; entre más pequeños sean de diámetro, más específicas serán las mediciones de volumen. Al leer el volumen de un cilindro graduado, notarán que el líquido parece tener una muesca; el líquido alrededor de los bordes será más alto que el líquido en el centro, inclinándose hacia abajo como los lados de un trampolín cuando alguien está parado en el medio. Esto se llama el menisco. Alineen el punto más bajo del menisco con la marca más cercana, manteniendo el nivel del cilindro para leer correctamente el volumen.

Answer:

Explanation:

Water is called the "universal solvent" because it is capable of dissolving more substances than any other liquidIt is water's chemical composition and physical attributes that make it such an excellent solvent. Water molecules have a polar arrangement of oxygen and hydrogen atoms—one side (hydrogen) has a positive electrical charge and the other side (oxygen) had a negative charge. This allows the water molecule to become attracted to many other different types of molecules. Water can become so heavily attracted to a different compound, like salt (NaCl), that it can disrupt the attractive forces that hold the sodium and chloride in the salt compound together and, thus, dissolve it.

If the half-life for carbon-14 is 5730 years, then it will take 11,460 years to complete die of this sample.

Half life period is a time of decay in which concentration of reactant is left half of its initial concentration, means half of the reactant will convert into product.

Total time of decay will be calculated as:

T = (t)ⁿ, where

t = half life time = 5730 years

n = number of half lives = 2 (given)

On putting values, we get

T = (5730)² = 11,460 years

Hence required time for decay is 11,460 years.

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Answer:

The first part is 5 and the second part is 28,650

Answer:

\( \huge{ \boxed{1.213 \: \text{moles}}}\)

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\( \bold{n = \frac{N}{L}} \\ \)

where

From the question

N = 7.30 × 10²³ NaCl molecules

\(n = \frac{7.30 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{7.30}{6.02} \\ = 1.2126\)

We have the final answer as

Carbon dioxide molecules can absorb and emit infrared radiation, and they are one of the most abundant constituents of Earth's atmosphere.

Thus, the correct options are:d) Are one of the most abundant constituents of Earth's atmospheree) Can move in many ways, thus absorbing and emitting infrared radiation

Carbon dioxide is a trace gas present in the Earth's atmosphere. It's a vital component of Earth's carbon cycle, which helps to regulate Earth's temperature and support life as we know it. Carbon dioxide molecules are one of the most common gases in the atmosphere, accounting for around 0.04% of the Earth's atmosphere.

The greenhouse effect is caused by carbon dioxide, methane, and other greenhouse gases. When the Sun's energy reaches the Earth's surface, it is absorbed and then radiated back into space as infrared radiation. Greenhouse gases absorb this radiation and trap it in the atmosphere, which causes the Earth's temperature to rise and the climate to change.

Carbon dioxide molecules are capable of absorbing and emitting infrared radiation due to their molecular structure, which consists of one carbon atom and two oxygen atoms. This property of carbon dioxide is the main reason it's classified as a greenhouse gas.

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To calculate the equilibrium constant (K) for this reaction, you can use the equation: K = [C]^c [D]^d / [A]^a [B]^b


To find the initial concentration of [A], divide the number of moles (0.0461 moles) by the volume of the container (1.00 liter). The initial concentration of [A] is 0.0461 M. Similarly, for [B], divide the number of moles (0.0697 moles) by the volume of the container (1.00 liter). The initial concentration of [B] is 0.0697 M. Now we have all the necessary information to calculate the equilibrium constant. Since we don't have the balanced chemical equation, I will assume a general equation:

aA + bB ⇌ cC + dD
Using the given information, we have:
[A] = 0.0461 M
[B] = 0.0697 M
[C] = 0.0191 M
Plugging in the values, the equilibrium constant (K) can be calculated as: K = (0.0191^c) / (0.0461^a * 0.0697^b)

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The effective nuclear charge (Zeff) felt by an electron in the 3s orbital of Na can be estimated using the formula Zeff = Z - S, where Z is the atomic number and S is the screening constant. For Na, Z is 11 and the screening constant for the 3s orbital is approximately 1.69.

Therefore, Zeff would be approximately 9.31. This means that the electron in the 3s orbital of Na would experience an effective nuclear charge of 9.31, which is less than the full nuclear charge of 11 due to the shielding effect of the other electrons in the atom.
The approximate effective nuclear charge (Zeff) felt by an electron in the 3s orbital of sodium (Na) can be determined using Slater's rules. Sodium has an atomic number (Z) of 11, which means it has 11 electrons. For the 3s electron, we consider the shielding effect from the inner (1s and 2s) and same-level (3s and 3p) electrons.

According to Slater's rules, the 1s and 2s electrons contribute 1.0 and the 3s and 3p electrons contribute 0.35 each to the shielding effect. Since there are 2 inner electrons (1s²) and 8 same-level electrons (2s² 2p⁶), the shielding effect is calculated as (2x1.0) + (8x0.35) = 4.8.

Finally, the Zeff is estimated by subtracting the shielding effect from the atomic number: Zeff = Z - shielding = 11 - 4.8 = 6.2. So, the approximate Zeff felt by an electron in the 3s orbital of Na is 6.2.

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Increasing the volume of the solution decreases the concentration of the hydrogen ions which subsequently increases the pH;  hence, increasing volume will increase the pH.

Higher is the concentration of H plus ions, more acidic is the solution and  lower the concentration of H plus ions, the less acidic is the solution. Basic strength of a solution depends on the concentration of OH minus ions.

When an acid and alkali react together, they produce salt and water. Acid + alkali → salt + water . As you know, water is neutral, so the acid alkali come together to neutralize each other to make pH 7.

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Answer

moles = 5.81 mol

Explanation

Given:

Volume = 144 L

AT SATP

1 mole = 24.4651 L

Solution:

1 mole = 24.4651 L

x mole = 144 L

x = 144/24.4651

x = 5.8 mol

Answer:

the answer is oxygen and carbon dioxide

After the solutions are mixed, a white precipitate of calcium oxalate will form, while the Li+ and Cl- ions will remain in the resulting solution.

When the solutions of CaCl2 and Li2C2O4 are mixed, a double displacement reaction occurs. The calcium ions (Ca2+) from CaCl2 react with the oxalate ions (C2O42-) from Li2C2O4 to form a precipitate of calcium oxalate (CaC2O4) according to the following equation:

CaCl2 + Li2C2O4 → CaC2O4 + 2 LiCl

Since calcium oxalate is insoluble in water, it will form a solid precipitate. The precipitate will appear as a white, finely divided solid in the solution. The remaining ions, Li+ and Cl-, will stay in the solution.

Therefore, after the solutions are mixed, a white precipitate of calcium oxalate will form, while the Li+ and Cl- ions will remain in the resulting solution.

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