***20 pts***
If you had 3.02 grams of Sodium (Na), how many moles would that be?
ANSWER W STEPS IF NOT REPORTED​

Answer:

because it is a theory

Explanation:

The best explanation for why scientific theories are modified is simply because it is a theory. Theories are created as a set of suppositions that help humanity understand something that would otherwise be unexplainable. Since they are not proven through scientific facts but instead are more of ideas that help further our understanding of a phenomenon, they tend to be modified as new ideas are introduced and others are proven to be false/wrong.

Answer:

Hunds rule is violated here.

Hunds rule : pairing of electrons takes place only if all the orbitals are filled with single electrons each.

Answer:

Mass = 22.725 g

Explanation:

Given data:

Mass of potassium nitrate required = ?

Volume of solution = 3.00 ×10² mL

Molarity of solution = 0.750 M

Solution:

Formula:

Molarity = number of moles of solute / L of solution

Now we will convert the volume into L.

3.00 ×10² mL × 1L  /1000 mL

0.003 ×10² L or 0.3 L

now we will put the values in formula.

0.750 M  = n / 0.3 L

n = 0.750 M × 0.3 L

M = mol/L

n = 0.225 mol

Mass of potassium nitrate:

Mass = number of moles  × molar mass

Mass = 0.225 mol × 101 g/mol

Mass = 22.725 g

Answer:

A represents London dispersion forces, and B represents hydrogen bonding.

Explanation:

The Intermolecular force between two non polar molecules will be weaker London-dispersion forces. The bond between a hydrogen containing molecule with another molecule of an electronegative atom such as O, N etc. is hydrogen bond.

Intermolecular forces are forces between two molecules that bind them together. The force of attraction is generated by sharing of electrons or by donation of electrons.

Non-polar molecules are those with no charge separation. But when two non-polar molecules comes in contact a temporary dipole will create there and they attract each by the opposite charge ends. This type of force is called London dispersion force.

One molecule with a hydrogen atom is able to form a hydrogen bond with an electronegative atom of another molecule due to the electronegativity difference between hydrogen atom and atoms like N, O, F etc.

Therefore, the intermolecular force A is London-dispersion force and B is hydrogen bonding. Hence, option A is correct.

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Answer:

answer: B

Explanation:

becaucse it is B

A bond between a nonmetal and a nonmetal is called a covalent bond. The correct answer is option C.

Covalent bonding occurs when two nonmetal atoms share one or more pairs of electrons in order to achieve a stable electron configuration.

This type of bond is characterized by the sharing of electrons between the atoms, rather than the transfer of electrons as in ionic bonding.

An example of a covalent bond between two nonmetals: The bond between two oxygen atoms in an [tex]\rm O_2[/tex] molecule. In this molecule, the two oxygen atoms share two pairs of electrons to form a stable covalent bond.

Therefore, option C. Covalent bond is a bond between a nonmetal and a nonmetal.

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Answer: sunlight, water, air, habitat, and food.

Explanation: we are all living organisms and we all have our five basic necessities for survival; sunlight, water, air, habitat, and food.

Answer:

B is the answer

Explanation:

Answer:

False.

Explanation:

If the gas is leaving it cannot have higher pressure.

Answer:

The volume of container is 39.14 L.

Explanation:

Given data:

Number of moles of neon = 4.0 mol

Pressure of gas = 2.5 atm

Temperature of gas = 25°C

Volume of container = ?

Solution:

we will use general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

Now we will convert the temperature.

25+273 = 298 K

Now we will put the values in formula.

2.5 atm × V = 4.0 mol × 0.0821 atm.L/ mol.K ×  298 K

V = 97.86 atm.L /2.5 atm

V = 39.14 L

The volume of container is 39.14 L.

Answer:

homogeneous mixture

Explanation:

The correct classification for air is a homogeneous mixture.

Material is referred to as a mixture when two or more chemicals combine without undergoing a chemical reaction.

Heterogeneous and homogeneous mixtures are the two types of mixtures.

While homogeneous mixtures seem consistent throughout, heterogeneous mixtures have clearly discernible components.

A solution, which can be a solid, liquid, or gas, is the most typical kind of homogenous mixture.

Mixtures are composed of two or more different substances that have not been chemically mixed. The following is a list of mixture properties.

Each of the components in a mixture retains its unique features.

Component separation is simple to carry out.

The component's relative weights vary.

The classification for air is 78% nitrogen, 21% oxygen, 0.9% argon, 0.03% carbon dioxide, and 0.07% other gases.

This classification for air has the properties of a homogeneous mixture.

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Answer:

Explanation:

The percentage error of a certain measurement can be found by using the formula

[tex]P(\%) = \frac{error}{actual \: \: number} \times 100\% \\ [/tex]

From the question

actual volume = 4.13 mL

error = 4.13 - 4.09 = 0.04

We have

[tex]p(\%) = \frac{0.04}{4.13} \times 100 \\ = 0.968523002...[/tex]

We have the final answer as

Hope this helps you

Answer:

today, petroleum is mostly used as a source of energy, being rich in combustible carbon in the production of electricity or running some sorts of heat engines. ... Raw petroleum (also known as crude oil) is used in three major ways: Transportation, Electricity Generation, and Material Production.

Explanation:

hope it helps!!!!!!!!!!!!!!!!!!!!!!!!!!

Answer:

Yes

Explanation:

Abstract. The negative ion of hydrogen continues to be important in atomic physics and astrophysics. Correlations between the two electrons are strong alieady in the ground state, the only bound state in this three-body system.

Answer:

homogeneous mixture

Explanation:

A homogeneous mixture and Solution are the physical blend of two or more substances with uniform composition. Thus, options A and C are true.

“Mixture is an act of combining two or more chemical substances that are not chemically linked.”

Types of mixtures –

There are two main types of mixture.

Homogeneous Mixture –

A Homogeneous Mixture is a mixture in which composition is uniform throughout the mixture, and it appears like a single substance.

Example – Air is a homogeneous mixture of gas etc.

Heterogeneous mixture –

A Heterogeneous mixture is a mixture in which composition is not uniform throughout the mixture.

Example – Vegetable soup is a heterogeneous mixture etc.

Solution –

A Solution is a homogeneous mixture of two or more solutes dissolved in a solvent.

Example – Solution of sugar in water etc.

Thus, a homogeneous mixture and solution are the physical blends of two or more substances with uniform composition. Thus, options A and C are true.

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Answer:

When an atom loses electron(s) it will lose some of its negative charge and so becomes positively charged. A positive ion is formed where an atom has more protons than electrons. In the opposite case when an atom gains electron(s) it becomes negatively charged (more electrons than protons).

Explanation:

Answer:

E

Explanation:

Predict the effect of a mutation which limits the production of pigment in hair

The animal would have white hair or hair with no color.

The animal would have light brown hair.

The animal would have black hair.

The animal would have no hair at all.

The animal would have white hair or hair with no color is the effect of a mutation which limits the production of pigment in hair.

Hence, the animal would have white hair or hair with no color is the correct option.

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Answer:

Please find attached a sketch of the heating curve of water at atmospheric pressure ( approximately 101 kPa) as traced from an online source

Explanation:

Given that the pressure at 101 kPa is approximately 1 atmosphere, we have;

The melting point and the boiling point occurs at approximately 0°C and approximately 100°C, respectively;

The melting point and the boiling point experience latent heat, therefore that temperature remains the same, though heat is continuously added

Also, given that the latent heat of vaporization (22.6 × 10⁵ J/kg) is approximately 7 times the latent heat of fusion is (3.33 × 10⁵ J/kg), the length of the plateau representing evaporation would be approximately 7 times longer than the length representing fusion.

The heating curve obtained from an online source for water at atmospheric pressure, is presented in the attached sketch.

Answer: 83.68 J

Explanation:

1 cal=4.184 J

1×20=4.184×20

20cals=83.68 J

Answer:

d

Explanation:educated guess

Answer:

magnesium

Explanation:

magnesium is in Group 2, in the periodic table. this means that it has 2 valence electrons. the less valence electrons an element or atom has, the more reactive. Selenium has 6 valence electrons. as a result, Mg is more reactive

Answer:

Química orgánica

Explanation:

Answer:

boiiiiiiiiiii

Explanation:

The question is incomplete; the complete question is:

Recall all the atomic models you described in task 1. think about the results...

Recall all the atomic models you described in task 1. think about the results each model would predict for rutherford’s gold foil experiment. which atomic models does rutherford’s experimental evidence support? explain why these models are compatible with the experimental results.

the models in task 1 were dalton's, thomson's, rutherford's, and bohr's.

Answer:

Bohr's

Explanation:

Rutherford's theory laid the foundation upon which Bohr's model is founded. Rutherford established the fact that at the center of the atom, there is a nucleus whose radius is smaller than the radius of the atom. This nucleus is positively charged and most of the mass of the atom is concentrated there. Electrons move round this nucleus in orbits.

The experimental evidences of the Bohr's model shows that Rutherford's model was fundamentally correct. However, Bohr's model introduced the idea of quantization of the energy of electrons in an atom. The model went further to explain the spectra lines of the hydrogen atom.

Answer:

What is the kinetic energy of a 2kg rabbit hopping at a speed of 1.25 m/s?1,5625J

Answer:distillation

Explanation:

The process represented by the diagram is chromatography.

Chromatography is a separation technique used to separate components present in a mixture.It makes use of two phases the stationary phase and mobile phase .

Stationary phase is a phase in which the mixture  components to be separated is loaded. Mobile phase is a phase which is run  over the stationary phase so as to enables components of mixtures to separate.

Separation of components is based on the principle that components of mixture which are soluble in mobile phase travel large distances over stationary phase while those which are insoluble or less soluble travel less distances over stationary phase.

For every component which is separated, a Rf value can be calculated which is simply ratio distance traveled by solute divided by distance traveled by solvent front.

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Answer:

Melting: one substance is involved and the liquid and solid are the same material.

To melt something heat is essential.

Dissolving: involves two materials;the resulting solution is a mixture of two substances.

The dissolved substance is still present in the solution even though it cannot be seen.

Explanation:

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Answer:

sun is the energy that powers the water cycle from