the hybridization of the nitrogen atom in the cation nh2 is: sp2

The very light weight of carbon tube makes it far more stronger than steel.

Aside the fact that carbon fibre has more strength than its respective steel, its durability is also an important property which makes it of better use. This implies that it can be used over a long period of time.

However, the great advantage it has over steel or any other metal is that it is very cheap to produce or manufacture.

Carbon is a chemical element found in the group 4 of the periodic table. It has atomic number of 6, valence electrons of 4, proton number of 6, neutron number of 6 and has 6 electrons.

In conclusion, carbon fibre is more stronger than steel in all characteristics including its safety.

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The statement describe the transfer of heat is : the ice cubes gains the heat energy and the water looses the heat energy.

The law of mass of conservation mass states that mass neither be created or nor be destroyed. The law of mass of conservation energy states that the heat energy in the isolated system should de constant. if the one thing is loose the energy then the other in will gains the energy in an isolated system. according to the conditions the ice cube is at lower energy .

Thus the ice cube will gains the the heat energy that the water looses the heat energy.

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The molality of acetonitrile in water is 9.84 mol/kg.

Molality is an expression of the amount of solute dissolved in a solvent, which is measured in moles per kilogram. Molality is calculated by dividing the moles of the solute by the mass of the solvent, in kilograms.

In this case, the moles of the solute (acetonitrile) can be calculated by multiplying the volume (130.0 mL) with the density (0.7766 g/mL) and dividing it by its molar mass (41.05 g/mol).

moles of acetonitrile = (130.0 mL)(0.7766 g/mL) / (41.05 g/mol) = 2.459 mol

The mass of the solvent (water) can be calculated by multiplying its volume (250.0 mL) with its density (1.000 g/mL).

mass of water = (250.0 mL) (1.000 g/mL) = 250 g

Thus, the molality of acetonitrile in water is:

molality = (2.459 mol) / (250 g)(1 kg/1000 g) = 9.84 mol/kg.

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The volume of the gas is 1.27 L at a temperature is 47°C and the pressure is 5.0 atm. Therefore, option (B) is correct.

The ideal gas equation is described as the equation of the state of a perfect gas. The ideal gas equation is the product of the pressure and volume of one-mole gas is equal to the multiplication of the absolute temperature and gas constant.

The mathematical equation for a perfect gas is as follows:

PV = nRT

where n is the moles of an ideal gas, P is the pressure of the gas,  V is the volume, and R is the universal gas constant.

Given, the initial volume of the gas, V₁ = 2.0 L

The initial temperature of the gas, T₁ =  27° C = 300.15 K

The initial pressure of the gas, P₁ = 3.0 atm

The final temperature of the gas, T₂ =  47° C = 320.15 K

The initial pressure of the gas, P₂ = 5.0 atm

We know that for an ideal gas:

\(\frac{P_1V_1}{T_1} =\frac{P_2V_2}{T_2}\)

\(V_2=\frac{P_1V_1T_2}{T_1P_2}\)

\(V_2= \frac{3.0\times2.0\times320.15}{5.0\times 300.15}\)

\(V_2= 1.27 L\)

Therefore, the volume of the gas in its final state is equal to 1.27 L when the gas is heated to 47ºC and compressed to 5.0 atm.

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Answer:

negative charge

Explanation:

An anion has more electrons than protons, consequently giving it a net negative charge.

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The change described in the process of reconstituting frozen orange juice is a physical change. A physical change refers to a transformation that affects one or more physical properties of a substance, such as its size, shape, or state, without altering its chemical composition.

Adding water to frozen orange juice to reconstitute it causes a change in its volume, but it does not create new substances or cause a chemical reaction. Therefore, it is considered a physical change. Other examples of physical changes include cutting an apple, melting ice, and boiling water.

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Answer:

Explanation:

Aliphatic compounds are those hydrocarbons that are the open chain compounds and also closed chains. Aromatic compounds are those who have only a closed chain structure. They can be saturated as well as unsaturated where the system can be open as well as closed chain.

Answer:

Water serves to suspend the red blood cells to carry oxygen to the cells. It is the solvent for the electrolytes and nutrients needed by the cells, and also the solvent to carry waste material away from the cells. With water as the solvent, osmotic pressure acts to transport the needed water into cells.

Explanation:

Answer:

2.67761514 moles

Explanation:

0.075kg equates to 75g.

This means that the car emits 75g of CO per km.

dividing 75g by the molar mass of CO (28.01g/mol) we get 2.67761514 moles

Answer:

H2S

Explanation:

The gas with the smallest molar mass diffuses the fastest (assuming that the holes are the same size and that gasses act ideally).
Find the molar mass of each of the gasses, and then compare.
CO2 = 12 + 16 + 16 = 32 + 12 = 44
HCl = 35.45 + 1 = 36.45
H2S = 1 + 1 + 32 = 34
NO2 = 14 + 16 + 16 =  32 + 14 = 46
Therefor, H2S diffuses the fastest, then HCl, then CO2, and finally NO2

As a general rule of thumb, compounds that involve a metal binding with either a non-metal or a semi-metal will display ionic bonding. Compounds that are composed of only non-metals or semi-metals with non-metals will display covalent bonding and will be classified as molecular compounds.

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The oxygen atom forms a double bond with the carbon atom, which involves sharing two pairs of electrons. However, since the carbon atom is also bonded to two other atoms.

To further explain, a double bond involves sharing four electrons between two atoms, with two of the electrons coming from each atom's valence shell. In the case of the propanal molecule, the oxygen atom has six valence electrons and needs two more to complete its octet, while the carbon atom has four valence electrons and needs four more to complete its octet.

In propanal (also known as propionaldehyde), the oxygen atom forms a double bond with the carbon atom. A double bond consists of two pairs of shared electrons. Therefore, the total number of pairs of electrons shared between these atoms is 2.

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The  two pairs of electrons shared between the oxygen atom and the carbon atom in a propanal molecule.

We can look at the structure of propanal. Propanal has the chemical formula C3H6O, with a carbonyl group (C=O) located on the second carbon atom. In this carbonyl group, the oxygen atom is double-bonded to the carbon atom. Double bonds involve the sharing of two pairs of electrons between atoms. Therefore, in a propanal molecule, the oxygen and carbon atoms share two pairs of electrons.
There are two pairs of electrons shared between the oxygen and carbon atoms in a propanal molecule, due to the double bond in the carbonyl group.

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Answer:

The bowling ball is red, has stripes, and has 3 finger holes.

Answer:

The shape of the bowling ball is round. The color of the bowling ball is red. The bowling ball is hard. The bowling ball is smooth.

Explanation: Hope I helped

There are 3.6132 × 1026 14C nuclei in the average adult human body.

The number of 14C nuclei that are there in the average adult human body .

We know that the average adult human mass is 70 kg. And about 12% of human body mass is carbon.Therefore, the mass of carbon in the human body is 12% of 70 kg = (12/100) × 70 kg = 8.4 kgWe need to find the number of 14C nuclei in the human body.

The atomic mass of 14C is different from that of 12C. So, first, we will find the mass of 14C.

The atomic mass of 12C is 12 u. The atomic mass of 14C is 14 u. This means that the mass of 14C is 14/12 times that of 12C. We can write this as:m(14C) = (14/12) × m(12C)

Where m(14C) is the mass of 14C and m(12C) is the mass of 12C. The mass of 12C in 1 mole of carbon is 12 g/mol.So, the mass of 14C in 1 mole of carbon is (14/12) × 12 g/mol = 14 g/mol

The number of moles of 14C in 8.4 kg of carbon can be calculated as follows:

Number of moles = mass/molar mass= 8400 g/14 g/mol= 600 mol

We know that 1 mole of any substance contains Avogadro's number of particles.

Avogadro's number is 6.022 × 1023.

Therefore, 600 mol of 14C contains:

6.022 × 1023 × 600 = 3.6132 × 1026 14C nuclei

Therefore, there are 3.6132 × 1026 14C nuclei in the average adult human body.

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The temperature at which 37 g of both copper(II) sulfate and potassium chloride dissolve in 100 g of water is approximately 38 ⁰C.

The solubility of a substance is its ability to be dissolved in water.

The solubility of 37 g of Copper (II) sulfate is determined from the solubility curve of Copper (II) sulfate.

The solubility of 37 g of potassium chloride is determined from the solubility of potassium chloride.

Thus, from the solubility charts, the temperature at which 37 g of both copper(II) sulfate and potassium chloride dissolve in 100 g of water is approximately 38 ⁰C.

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Answer:

2C5H12O+15O2→10CO2+12H2O

Explanation:

To prove the Law of Conservation of Mass, this equation is not balanced. To balance it, you need to show the work to find out how to balance it. To do that, You look at the C’s first and question are they balanced? They aren’t so you add a CO2 and continue that process until it’s balanced for each element.

Answer: in 25 yards there is 75 feet. Witch is the same to say that 25 yards is 75 feet.

Explanation:

Answer:

25yd is bigger

Explanation:

Answer:

wind

pollution free no use of resources

Wind resource produces the most energy for the smallest amount of resources. Hence option 5 is correct.

Resources are defined as a type of physical substance, like land, air, or water, that people value and require. A resource can be classified as renewable or nonrenewable based on whether it can replace itself at the rate it is used up or whether it has a finite supply. When people cherish natural resources, they become resources themselves.

Renewable energy sources like sun and wind don't consume fuel and emit no greenhouse gases. They are much more efficient at converting energy into electricity, producing less waste and cost-saving results. With 83% of the world's electricity coming from renewable sources, hydroelectric energy is by far the most common.

Thus, wind resource produces the most energy for the smallest amount of resources. Hence option 5 is correct.

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Answer:

A. 2.71 V

Explanation:

The standard reduction potential, E° of the metals are as follows:

Mg²⁺ + 2e⁻ ⇌  Mg; E° = -2.372

Cu²⁺ + 2e⁻ ⇌  Cu; E° = +0.337

Since magnesium has the the lower E°, it will serve as the anode in the electrolytic cell while copper will serve as the cathode.

At the anode; Mg ⇌  Mg²⁺ + 2e⁻, E° = -2.372

At the cathode; Cu²⁺ + 2e⁻ ⇌  Cu, E° = +0.337

EMF of the cell = E° cathode - E° anode = 0.337 - (-2.372) = 2.71 V

Therefore, EMF of the cell is 2.71 V

Answer:-2.71 is the correct answer

Explanation:

A P E X

Answer:

Dmitri Mendeleev

Explanation:

Dmitri Mendeleev a Russian Chemist arranged elements on the periodic table according to their atomic mass. He used this arrangement to predict some of the properties of the missing element.

Answer:311

∘

C

Explanation:

The idea here is that the volume and the temperature of a gas have a direct relationship when the pressure and the number of moles of gas are being kept constant

→

this is known as Charles' Law.

A very important thing to remember is that the temperature of the gas must be expressed in Kelvin. In other words, you must always work with the absolute temperature of a gas.

So, start by converting the temperature of the gas to Kelvin by using

T

[

K

]

=

t

[

∘

C

]

+

273.15

−−−−−−−−−−−−−−−−−−−−

You will have

T

=

166

∘

C

+

273.15

=

439.15 K

The volume of the gas will increase as temperature increases and decrease as temperature decreases. Mathematically, this can be written as

V

1

T

1

=

V

2

T

2

−−−−−−−−−

Here

V

1

and

T

1

represent the volume and the temperature of the gas at an initial state

V

2

and

T

2

represent the volume and the temperature of the gas at a final state

Rearrange the equation to solve for

T

2

V

1

T

1

=

V

2

T

2

⇒

T

2

=

V

2

V

1

⋅

T

1

Plug in your values to find

T

2

=

913

mL

686

mL

⋅

439.15 K

=

584.47 K

Finally, convert this to degrees Celsius

t

[

∘

C

]

=

584.47 K

−

273.15

=

311

∘

C

−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−

The answer is rounded to three sig figs.

Explanation:

Answer:

the answer is c). transverse wave

The balanced reaction equation is; \(2C_{3} H_8}O + 9O_{2} ------- > 6CO_{2} + 8H_{2} O\)

We know that a reaction is said to occur when atoms are combined. The combination of atoms would be represented by a reaction equation. The reaction equation is said to be balanced when the number of atoms of  each of the elements on the reactants side is equal to the number of atoms on the products side.

We would now look at the reaction so as to ensures that all the atoms on the reactant side is the same as the number of atoms on the products side.

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Answer:

Explanation:

B I got it right

Answer:

B. The ball will gain kinetic energy, and the racket will lose kinetic

energy

Explanation:

The onset of helium burning at the core of a star normally begins with a process called helium flash.

This occurs when the helium in the core becomes dense enough and hot enough to undergo nuclear fusion. The temperature needed for helium fusion is much higher than that required for hydrogen fusion, so helium burning only occurs in the very central regions of stars that have exhausted their hydrogen fuel.

                                 During the helium flash, the core rapidly heats up and expands, which causes a rapid increase in the fusion rate and the production of large amounts of energy. This energy is then transported outwards, causing the outer layers of the star to expand and cool, resulting in a brief but intense phase of stellar evolution known as the asymptotic giant branch (AGB) phase.
                                The onset of helium burning at the core of a star normally begins with the process called the "triple-alpha process." In the triple-alpha process, three helium nuclei, also known as alpha particles, combine to form a carbon nucleus. This fusion process occurs when the star has exhausted its hydrogen fuel in the core and has reached a high enough temperature and pressure for helium burning to begin.

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Electrolyte:

The substance that conducts electricity is known as an electrolyte.

Explanation :

For example, strong and weak acids and bases, as well as salts, are examples of electrolytes. In contrast, nonelectrolytes are substances that do not conduct electricity.

Strong electrolyte: Strong electrolytes fully dissociate in solution to produce ions.

For example, all ionic compounds are strong electrolytes, and acids such as hydrochloric acid and nitric acid are strong electrolytes.

Weak electrolyte: Weak electrolytes only partially ionize in solution, resulting in a few ions and a few molecules in solution.

For example, weak acids like acetic acid are weak electrolytes.

Nonelectrolyte: Nonelectrolytes don't conduct electricity in solution because they don't produce ions. For example, sugar and ethanol are both nonelectrolytes.

The following are the identifications of each substance as a strong electrolyte, weak electrolyte, or nonelectrolyte:

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Answer:

positive

Explanation:

Explanation:

A proton has positive charge ...

Answer:

dense and humid

Explanation: