What is the formula for sodium selenide?

Okay, let's solve this step-by-step:

* We are given that the initial volume of the gas is 1.75 L at 1 atm pressure

* We want to know the pressure if the volume increases to 16.60 L

* According to Boyle's Law: Pressure x Volume = Constant

* Since the initial pressure is 1 atm and volume is 1.75 L, the constant is:

1 atm x 1.75 L = 1.75 atm*L

* When the volume increases to 16.60 L, plugging into Boyle's Law:

P x 16.60 L = 1.75 atm*L

* Solving for P (pressure):

P = 1.75 atm*L / 16.60 L

P = 0.105 atm

Therefore, the pressure of the 1.75 L of disulfur monoxide gas if it occupied a volume of 16.60 L would be 0.105 atm.

The main use of hexane is as a solvent to extract edible oils from seed and vegetable crops. Hexane are used as solvents for contact cement, varnishes, and inks.

Hexanes are mostly used as a solvent. It is used to extract edible oils from seeds and vegetables and as a cleaning agent. The high levels of hexane causes mild central nervous system effects it includes dizziness, slight nausea, and headache etc.

In the construction industry, the hexane is an effective chemical which is use as the strongest organic solvents. It dissolves chemical material which allows the objects to bind together to form a strong force.

Thus,  Hexane are used as solvents for contact cement, varnishes, and inks.

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The periodicity and patterns displayed by the earlier versions of the periodic table played a critical role in driving the discovery of new elements, and the periodic table remains an essential tool for organizing and understanding the properties of the known elements today.

The chemical elements are arranged in rows and columns in the periodic table, sometimes referred to as the periodic table of the elements.

The Russian chemist Dmitri Mendeleev's periodic table, which he developed in 1869 and which established the periodic law as the dependence of chemical properties on atomic mass, was the first to be widely acknowledged.

Mendeleev's periodic table had gaps because not all elements were known at the time; however, he was able to forecast some of the missing elements' properties using the periodic law.

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Answer: true

Explanation: An atom does of a positively charged nucleus, surrounded by one or more negatively charged particles called electrons. The positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. Protons and neutrons have nearly equal masses, but in a way they DO differ in charge.

Answer:

Explanation:

When a soap is used in hard water, a solid substance we call  This is because charged calcium and magnesium particles called ions present in the water react with soap to form an insoluble substance.

Answer:

n-nonane

Explanation:

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Answer:

Is there a question?

Explanation:

Answer:

How do amoeba respire.

Define Diffusion.

Answer:

A small amount of chemical splashes in Frank's eye. What should happen next? Frank should go to the eyewash station while his lab partner tells the teacher what happened.

Explanation:

Brainlist

In the given reaction, the limiting reactant is C₆H₆ (benzene).

To determine the limiting reactant as well as calculate the mass of HCl produced, compare the moles of each reactant.

The number of moles for each reactant:

Molar mass of Cl₂ = 35.5 g/mol + 35.5 g/mol = 71 g/mol

Moles of Cl₂ = mass of Cl₂ / molar mass of Cl₂

                     = 45 g / 71 g/mol

                     = 0.634 moles of Cl₂

Molar mass of C₆H₆ (benzene) = 12 g/mol + 6(1 g/mol) = 78 g/mol

Moles of C₆H₆ = mass of C₆H₆ / molar mass of C₆H₆

                        = 45 g / 78 g/mol = 0.577 moles of C₆H₆

Determine the stoichiometry between Cl₂ and HCl:

Cl₂ + C₆H₆ → C₆H₅Cl + HCl

Here, we can see that 1 mole of Cl₂ produces 1 mole of HCl.

Thus, the limiting reactant is C₆H₆ (benzene).

Calculate the mass of HCl produced:

Molar mass of HCl = 1 g/mol + 35.5 g/mol = 36.5 g/mol

Moles of HCl produced = moles of C₆H₆ = 0.577 moles

Mass of HCl produced = moles of HCl produced × molar mass of HCl

Mass of HCl produced = 0.577 moles × 36.5 g/mol

                                     ≈ 21.04 g

Therefore, approximately 21.04 grams of HCl will be produced.

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Answer:

Volume = 3.4 L

Explanation:

In order to calculate the volume of CO₂ produced when 15.2 g of CaCO₃ is heated, we need to first write out the balanced equation of the thermal decomposition of CaCO₃:

CaCO₃ (s) + [Heat] ⇒ CaO (s) + CO₂ (g)

Now, let's calculate the number of moles in 15.2 g CaCO₃:

mole no. = \(\mathrm{\frac{mass}{molar \ mass}}\)

                 = \(\frac{15.2}{40.1 + 12 + (16 \times 3)}\)

                 = 0.1518 moles

From the balanced equation above, we can see that the stoichiometric molar ratios of CaCO₃ and CO₂ are equal. Therefore, the number of moles of CO₂ produced is also 0.1518 moles.

Hence, from the formula for the number of moles of a gas, we can calculate the volume of  CO₂:

mole no. = \(\mathrm{\frac{Volume \ in \ L}{22.4}}\)

⇒ \(0.1518 = \mathrm{\frac{Volume}{22.4}}\)

⇒ Volume = 0.1518 × 22.4

                 = 3.4 L

Therefore, if 15.2 g of CaCO₃ is heated, 3.4 L of CO₂ is produced at STP.

The concentration of H₂SO₄ solution is equal to 0.0480 M.

A neutralization reaction is described as a chemical reaction where acid and base react to produce respective salt and water. When a strong acid reacts with a strong base then the salt can be neutral.

When H₂SO₄ (a strong acid) reacts with NaOH, the resulting salt is Na₂SO₃  and water.

H₂SO₄  +  2 NaOH   →   Na₂SO₄  +   2H₂O

Given, the concentration of NaOH = 0.146 M

The volume of the NaOH = 14.85 ml = 0.01485 L

The number of moles of NaOH, n = M × V = 0.146 × 0.01485 = 0.00216 M

The volume of the  H₂SO₄ = 22.55 ml = 0.02255 L

The number of moles of  H₂SO₄, n = 0.00216/2 = 0.00108 mol

The concentration of H₂SO₄ =0.00108/0.02255 = 0.0480 M

Therefore, the molarity of  H₂SO₄ is 0.0480 M.

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Answer:

Cellular respiration

Explanation:

Fermentation is a mechanism in anaerobic respiration(breaking down glucose in the absence of oxygen). Examples are lactic acid fermentation is humans, Alcohol fermentation in yeast.

Cellular respiration sums up both anaerobic and aerobic(with oxygen)

Metabolism is just breaking down food molecules chemically into their simplest forms (monomers). These monomers then undergo cellular respiration to produce ATP

Answer:

The question wants you to determine the energy that the incoming photon must have in order to allow the electron that absorbs it to jump from

n

i

=

2

to

n

f

=

6

.

A good starting point here will be to calculate the energy of the photon emitted when the electron falls from

n

i

=

6

to

n

f

=

2

by using the Rydberg equation.

1

λ

=

R

⋅

(

1

n

2

f

−

1

n

2

i

)

Here

λ

si the wavelength of the emittted photon

R

is the Rydberg constant, equal to

1.097

⋅

10

7

m

−

1

Plug in your values to find

1

λ

=

1.097

⋅

10

7

.

m

−

1

⋅

(

1

2

2

−

1

6

2

)

1

λ

=

2.4378

⋅

10

6

.

m

−

1

This means that you have

λ

=

4.10

⋅

10

−

7

.

m

So, you know that when an electron falls from

n

i

=

6

to

n

f

=

2

, a photon of wavelength

410 nm

is emitted. This implies that in order for the electron to jump from

n

i

=

2

to

n

f

=

6

, it must absorb a photon of the same wavelength.

We have that The isotope of copper with the atomic mass of the isotope copper 62.930 amu is Cu 63

From the question we are told

the atomic mass of the isotope copper-__ is 62.930 amu

Generally

Copper is the 29th element of the the periodic table with an atomic mass of 29.

Copper as an elementt has 2 stable isotopes which are

Cu 63

Cu 65

Therefore

The isotope of copper with the atomic mass of the isotope copper 62.930 amu is Cu 63

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Answer:

3.34 x 1023 atoms

Explanation:

Answer:

Tetrahedral

Bent

Explanation:

A molecule in sp3 hybridization is ordinarily expected to exhibit tetrahedral electron domain geometry. This implies that it has four electron domains.

We were specifically informed in the question that two lone pairs are present. Remember that lone pairs distort the molecular geometry away from the expected geometry based on VSEPR  theory.

Therefore, the bond angle of the molecule is <<109.5 degrees and its molecular geometry is bent (e.g water)

Answer:

arthropod

Explanation:

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Answer:

 .24 mg

Explanation:

The mineral contains .016 % silicon

mass of the mineral = 1.5 kg

mass of silicon = 1.5 x .016 %

= 1.5 x .016 / 100

= 24 x 10⁻⁵ kg

= 24 x 10⁻² mg

= .24 mg .

A 1.60 g calcium supplement that contains 37.8% Ca by mass, contains 1.51 g of CaCO₃.

We want to calculate the mass of CaCO₃ in a 1.60 g supplement. We need to consider the following relationships.

\(1.60gSup \times \frac{37.8gCa}{100gSup} \times \frac{1molCa}{40.08gCa} \times \frac{1molCaCO_3}{1molCa} \times \frac{100.09gCaCO_3}{1molCaCO_3} = 1.51gCaCO_3\)

A 1.60 g calcium supplement that contains 37.8% Ca by mass, contains 1.51 g of CaCO₃.

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A 1.60 g calcium supplement contains 37.8% Ca by mass. The calcium is present in the supplement as CaCO₃(s) (molar mass 100.09 g/mol). How many grams of CaCO₃(s) are in the calcium supplement?

(b) This question is incomplete. To determine how many moles of CuSO4 are present in the impure sample, however. The following formula may be applied

moles = mass of CuSO₄  in impure sample ÷ molar mass of CuSO₄

(c) This question is also incomplete. , to calculate the mass percentage of CuSO₄ present in the impure sample of CuSO₄, the formulato be  used is :

Mass percentage of CuSO₄ =mass of CuSO₄ present in the impure sample divide by mass of impure CuSO₄ × 100

Since the actual mass of the CuSO4 contained in the impure sample had to be determined before determining the number of moles, the mass of the impure sample must also be measured.

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Answer:

Two positive aspects of using methane recapture systems are able to generate significant electricity. Another benefit is that the process of anaerobic digestion creates heat that can be used to warm buildings where animals are kept

Answer:  The correct answer is;

Two positive aspects of using methane recapture systems include lowering the impact on greenhouse gasses and the production of energy. Methane is a very potent greenhouse gas that is contributing to global warming. As a result, the recapturing process reduces the methane impacts of global warming by reclaiming and reusing the gas for other purposes. Recaptured methane can be stored and used to generate electricity or used as fuel to power updated vehicles and other engines on the farm. The overall benefits from this combination are reducing impacts causing global warming and lower the cost of electricity or fuel on the farm.

Explanation:  This answer has been confirmed correct.

The combustion of wood results in the generation of new substances such as carbon dioxide gas, water vapor, ash, and so on. Some compounds do not completely burn or do not react at all, resulting in the formation of fire ash.

When we burn wood, it transforms into ashes, a new material, and the process is irreversible, resulting in a chemical shift. No new material is generated while chopping the wood into little pieces. It is a bodily transformation. When two colorless liquids are put together, the creation of a solid precipitate indicates the presence of a chemical reaction. When a colorless solution of lead(II) nitrate is added to a colorless solution of potassium iodide, an immediate yellow solid known as a precipitate is formed. Dense hardwood species, such as maple and oak, contain more energy, burn hotter and slower, and release more heat, resulting in longer-lasting fires and coal beds. Because softwoods are less thick than hardwoods, they burn quicker in short-lived flames.

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Answer:

May be its correct bro

Explanation:

take it easy

Answer:

A ---->gamma ray

Explanation:

Gamma rays have the highest frequencies among all electromagnetic waves and therefore have the shortest wavelengths.

Answer:

hello hope this helps :)

a pure substance consists only of one element or one compound. a mixture consists of two or more different substances, not chemically joined together.

Explanation:

Answer:

28.6

Explanation:

Step 1: Write the balanced reaction at equilibrium

CO(g) + Cl₂(g) ⟺ COCl₂(g)

Step 2: Calculate the equilibrium partial pressure (in atm) of phosgene?

We will use the expression for the pressure equilibrium constant (Kp)

Kp = pCOCl₂ / pCO × pCl₂

pCOCl₂ = Kp × pCO × pCl₂

pCOCl₂ = 1.49 × 10⁸ × 4.38 × 10⁻⁴ × 4.38 × 10⁻⁴ = 28.6