what is the concentration, in m/v percent, of a solution prepared from 50. g nacl and 2.5 l of water?

Answer:

A

Explanation:

In the scientific name limus polyphemus which the species is the classification group for polyphemus

Answer: The mass density is 1166.36 \(kg/m^{3}\).

Explanation:

Given: Weight of sample in air \((F_{air})\) = 500 N

Weight of sample in alcohol \((F_{alc})\) = 200 N

Specific gravity = 0.7 = \(0.7 \times 1000 = 700 kg/m^{3}\)

Formula used to calculate Buoyant force is as follows.

\(F_{B} = F_{air} - F_{alc}\\= 500 - 200 \\= 300 N\)

Hence, volume of the material is calculated as follows.

\(V = \frac{F_{B}}{\rho \times g}\)

where,

\(F_{B}\) = Buoyant force

\(\rho\) = specific gravity

g = acceleration due to gravity = 9.81

Substitute the values into above formula.

\(V = \frac{F_{B}}{\rho \times g}\\= \frac{300}{700 \times 9.81}\\= \frac{300}{6867}\\= 0.0437 m^{3}\)

Now, mass of the material is calculated as follows.

\(mass = \frac{F_{air}}{g}\\= \frac{500 N}{9.81}\\= 50.97 kg\)

Therefore, density of the material or mass density is as follows.

\(Density = \frac{mass}{volume}\\= \frac{50.97 kg}{0.0437 m^{3}}\\= 1166.36 kg/m^{3}\)

Thus, we can conclude that the mass density is 1166.36 \(kg/m^{3}\).

It expected to assume tetrahedral in shape.

Tetrahedral molecules are those in which the central atom has four bonds and no lone pairs. The atoms bonded to the central atom are located at the four corners of a tetrahedron, and there are 109.5° angles between them.

A common example of a tetrahedral structure is methane, which contains four hydrogen atoms around the carbon atom. The nitrogen atom at the centre of the ammonium ion is surrounded by four hydrogen atoms.

The carbon atoms are organised tetrahedrally in a diamond. With a C-C-C bond angle of 109.5 degrees, each carbon atom is joined to four more carbon atoms at a distance of 1.544 x 10⁻¹⁰metres. It produces an endless network of atoms and has a robust, hard three-dimensional structure.

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The molecule of the sort ML₄ consists of four single bonds and no lone pairs.The structure is it expected to assume is  tetrahedral

What is meant by tetrahedral structure?

Tetrahedral may be a molecular shape that occurs when there are four bonds and no lone pairs in the molecule's central atom. The atoms bonded to the central atom are located at the four corners of a tetrahedron, with 109.5° angles between them.

What is a Molecule?

A molecule may be a particle made up of two or more atoms that are chemically bonded together; the number of atomic nuclei making up a molecule is a determinate number. for instance , HCl(g) may be a molecule made of one hydrogen atom bonded to one chlorine atom.

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Answer:

20.0 g H2 x 1 mole H2/2g = 10.0 moles

moles NH3 = 10.0 mol H2 x 2 mol NH3/3 mol H2=6.67 moles

mass NH3 = 6.67 moles x 17g/mol = 113 grams

Answer: The correct option is A. The moon's orbit around Earth

Explanation: Newtons first law of motion says that an object in motion will always remain in motion and an object in erst will always stay at rest untill an external force acts upon it. This law is also called law of inertia which is the property of a body to resist any change in its state of rest or motion. Since moon is also revolving around the earth so it is in motion always and it continues its motion.

Answer:

the moon’s orbit around Earth

Explanation:

Answer:

Chemical bonds hold molecules together and create temporary connections that are essential to life.

Explanation:

Chemical Bonding refers to the formation of a chemical bond between two or more atoms, molecules, or ions to give rise to a chemical compound. These chemical bonds are what keep the atoms together in the resulting compound.

Answer:

Chemical bonds hold molecules together and create temporary connections that are essential to life.

Explanation :

A chemical bond is a lasting attraction between atoms, ions or molecules that enables the formation of chemical compounds. The bond may result from the electrostatic force between oppositely charged ions as in ionic bonds or through the sharing of electrons as in covalent bonds.

Answer:

347.4 (19.3 mole)

Explanation:

CH4 + 2O2 = CO2 + 2H2O

1(mole) - 9.65(mole)

2(mole) - x ⇒x = 9.65*2=19.3

m=n*M ⇒ m= 19.3*(1*2+16)= 19.3*18=347.4(g)

A 1.26 g sample of He gas has a pressure of 0.123 arm and a volume of 32.6 L, then the temperature of the gas is -117.7 degree C.

Temperature of any gas will be calculated by using the ideal gas equation as:

PV = nRT, where

P = pressure of gas = 0.123 atm

V = volume of gas = 32.6 L

R = universal gas constant = 0.082 L.atm / K.mol

T = temperature of gas = ?

n is moles of He gas and will be calculated as:

n = W/M, where

W = given mass = 1.26g

M = molar mass = 4 g/mol

n = 1.26 / 4 = 0.315 moles

On putting values we get,

T = (0.123)(32.6) / (0.315)(0.082)

T = 155.41 K = 155.41 - 273.15 = -117.7 degree C

Hence required temperature of the helium sample is -117.7 degree C.

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Answer:

The car is carrying a volume of air that is moving at 80 mph relative to the ground. But inside the car itself, the air not moving very much. If you take the windshield out and drive a 80 mph you will smash the fly onto the back window.

Explanation:

.

Answer:

B and C which are the same

Explanation:

neutral ph which ranges about from 0 to 7 it is about where water is

The answer is most likely D

Each F atom has a formal charge of 0 and the I atom has a formal charge of +2. The overall charge on IF₅ is 0.

The Lewis structure of IF₅ is, I; 7 valence electrons, F; 7 valence electrons each (5 F atoms)

Total valence electrons = 7 + 5(7) = 42

We place I at the center and connect it with the 5 F atoms using a single bond. This uses 6 valence electrons. We then place the remaining 36 electrons as lone pairs on the F atoms, giving each F atom a full octet. The Lewis structure is;

  F      F

  |      |

F--I--F--F--F

  |  

  F

To determine the formal charge on each atom, we use the formula;

Formal charge = valence electrons-lone pair electrons - 1/2(bonding electrons)

Valence electrons for I = 7

Lone pair electrons on I = 0

Bonding electrons on I = 5 x 2 = 10

Formal charge on I = 7 - 0 - 1/2(10) = +2

Valence electrons for F = 7

Lone pair electrons on F = 6

Bonding electrons on F = 1 x 2 = 2

Formal charge on F = 7 - 6 - 1/2(2)

= 0

Therefore , the charge of each atom in IF₅ is zero (0).

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Answer:

grams

Explanation:

With grams, you can calculate the mass of something. Centimeters would just give you the volume, which doesn't indicate how much matter makes up an object.

Answer:

Yes its vinegar

Explanation:

Actually \( \bold{\red {C_2H_4O_2}} \) is the formula for acetic acid which is found in vinegar.

Aluminum oxide (Al2O3) is a chemical compound that occurs naturally. It is also known as alumina and is one of the most important oxides of aluminum. It occurs in different forms, including ruby and sapphire gems, as well as aluminum metal production.

In Al2O3, the ratio of aluminum to oxygen is 2:3. The empirical formula of aluminum oxide is also the same, Al2O3.What is Aluminum oxide (Al2O3)?Aluminum oxide, Al2O3, is a chemical compound that is widely used. Al2O3 is a white powder that is amphoteric, which means it dissolves in both acids and bases. It's made up of aluminum and oxygen atoms that are combined in a 2:3 ratio.

It is a relatively inert substance with a high melting point, making it useful for many applications. In addition, Al2O3 is commonly used as a filler, catalyst, or abrasive in a variety of applications.What are the properties of Al2O3?The following are the properties of Aluminum oxide (Al2O3):It is a white to nearly white crystalline powder that is odorless and tasteless in appearance.

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Answer:

IR radiation results in vibrational excitation of the bonds in a compound.

Answer:

The answer would be meniscus.

If iron metal is added to a solution of copper (ii) nitrate then a balanced chemical equation can be represented as;

\(Fe + Cu(NO_{3} )_{2} ---- > Fe(NO_{3}) _{2} + Cu\)

If iron metal is added to a solution of copper (ii) nitrate then a replacement reaction will take place.

A replacement reaction can be described as a reaction in which elements switch places in compounds. This type of reaction generally involves ions. In a replacement reaction, the more reactive elements replace the less reactive elements. A single replacement reaction takes place if one element replaces another element in one compound.

In this case, copper of copper (ii) nitrate is replaced by iron to give the product of iron (iii) nitrate and copper

Hence the chemical reaction, in this case, can be given as;

\(Fe + Cu(NO_{3} )_{2} ---- > Fe(NO_{3}) _{2} + Cu\)

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0.3 moles of Oxygen is excess reactant (reagent) when yield is 100% .

NO =5.6 moles

O2= 3.1 moles

2NO + O2 --> 2NO2 the chemical reaction.

the ratio of NO and O2 is 2:1

therefore for 5.6 moles of NO, 2.8 moles of Oxygen(O2) is required. So 3.1moles - 2.8 moles = 0.3 moles

The reactant in a chemical reaction that is present in a quantity that is larger than what is required to fully react with the limiting yield is known as the excess reactant. The substance(s) still present after a chemical reaction has reached equilibrium in yield are the reactant(s). Subtract the mass of excess reagent eaten from the total mass of excess reagent provided to determine the quantity of yield that is still present. Reactants in a chemical reaction are referred to as excess reagents if they are still present after the reaction is complete.

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Answer:

89-91=1 the answer is 1molar mass

40 J work is done by a system on its environment when an ideal gas is maintained at a constant pressure.

The volume of the gas particles is quite small. The gasses are of similar size and do not interact with one another through intermolecular (attraction or repulsion). The motion of the air molecules is consistent with the Newtonian laws of motion. Perfect elastic conflicts occurred between gas particle pairs with no energy being lost.

Given that the effort performed by the outside environment is described as

W = PΔV

Here, we are aware of

P = 200 N/m²

ΔV = 0.2 m³

now that we will

W = PΔV

W = 200 N/m² (0.2m³)

W = 40 J

Therefore, the external atmosphere will exert 40 J of work.

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Answer:

AlCl3

Explanation:

reaction between aluminium and chlorine will give aluminium chloride

i dont know man they're weird

Cepheid variables and RR Lyrae stars are both pulsating stars that astronomers use as standard candles to measure cosmic distances.

However, Cepheids are brighter and have longer periods than RR Lyrae stars. This means that they can be seen farther away and used to measure distances to more distant galaxies than RR Lyrae stars. In fact, a typical Cepheid variable is about 100 times brighter than a typical RR Lyrae star. This means that Cepheids can be used to measure distances up to tens of millions of light-years, while RR Lyrae stars are only useful for distances within our own galaxy and nearby galaxies. The use of Cepheids as distance-measuring tools has been crucial for the study of the large-scale structure and evolution of the universe.

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The steric strain occurs when parts of molecules are too close together and their electron clouds repel each other. Molecules with steric strain are less stable than those without strain.

Steric strain arises from the repulsion between electron clouds of atoms or groups within a molecule. This repulsion occurs when atoms or groups are positioned too close to each other, causing their electron clouds to overlap and experience repulsive forces.

To alleviate steric strain, molecules tend to adopt conformations or orientations where atoms or groups are spread out or positioned in different directions, minimizing the overlap of electron clouds and reducing the repulsive forces. By doing so, the molecule achieves a more stable configuration.

Molecules with significant steric strain are generally less stable compared to molecules without strain. The presence of steric strain can impact various properties of the molecule, such as its reactivity, conformational flexibility, and overall stability.

In summary, steric strain occurs when parts of molecules are too close together, their electron clouds repel each other, and molecules with steric strain are less stable than those without strain.

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Answer:

THE 3 third one

Explanation:

A solution of HNO₃ with a hydrogen ion content of 0.65 M has a pH of 0.19.

Nitric acid (HNO₃) is a useful chemical that is employed in the production of fertilisers, dyes, drugs, and explosives. This acid's pH is required to calculate. A pH of less than 7 is acidic. Nitric acid's hydrogen ion concentration of 0.65 M has to be used to calculate the pH. The formula for the calculation of pH is given below:

pH = -log[H⁺] [H⁺] is equal to 0.65 M

pH can be computed using this formula:

pH = -log[H⁺]

pH = -log[0.65]

pH = 0.187

pH=0.19

Hence, the pH of a HNO₃ solution having a hydrogen ion concentration of 0.65 M is 0.19.

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The balanced chemical equation between strong base and weak acid is represented as follows:

NaOH(aq)+ CH3COOH(aq)-----> CH3COONa(aq) + H2O(l)

When an acid reacts with a base, a salt is formed along with the formation of water, and this reaction is termed as neutralization reaction.

When a weak acid and a strong base are mixed, they react according to the following net-ionic equation: HA(aq) + OH⁻(aq) → A⁻(aq) + H₂O(l).

The balanced chemical equation between strong base and weak acid is represented as follows:

NaOH(aq)+ CH3COOH(aq)-----> CH3COONa(aq) + H2O(l)

Here, sodium hydroxide (NaOH) is a strong base and acetic acid (CH3COOH) is a weak acid.

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