How many grams of potassium chloride (KCl) can be dissolved in 68.0g of water at 40°C? Please help.

An elements's emission spectrum determines the electron energy levels and the correct option is option C.

An element's emission spectrum is determined by the specific energy levels of its electrons. When an electron in an atom transitions from a higher energy level to a lower energy level, it releases energy in the form of electromagnetic radiation.

The wavelength and frequency of this emitted light correspond to specific energy differences between the electron energy levels. Each element has a unique arrangement of electron energy levels, leading to a distinct emission spectrum.

By analyzing the emitted light, scientists can identify the element and gain insights into its atomic structure. The size of the sample, mass of the nucleus, and number of protons do not directly determine an element's emission spectrum.

Thus, the ideal selection is option C.

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Answer:

5 grams

Explanation:

Answer:

A. mol/kg

Explanation:

hope it helps .

Answer:

18.76 g of copper II nitrate

Explanation:

Now recall that we must use the formula;

n= CV

Where;

n= number of moles of copper II nitrate solid

C= concentration of copper II nitrate solution

V= volume of copper II nitrate solution

Note that;

n= m/M

Where;

m= mass of solid copper II nitrate

M= molar mass of copper II nitrate

Thus;

m/M= CV

C= 0.05 M

V= 2.00 L

M= 187.56 g/mol

m= the unknown

Substituting values;

m/ 187.56 g/mol = 0.05 M × 2.00 L

m= 0.05 M × 2.00 L × 187.56 g/mol

m= 18.76 g of copper II nitrate

Therefore, 18.76 g of copper II nitrate is required to make 0.05 M solution of copper II nitrate in 2.00 L volume.

Answer: 23927 cups of coffee would be required to fill the world record coffee cup.

Explanation:

Volume of cup of coffee = 318 ml

Volume of largest cup (world record coffee cup) of coffee = 2010 gallon  

Volume of largest cup of coffee in ml = [tex]2010\times 3785.41=7608678ml[/tex]  ( 1 gallon = 3785.41 ml)

To find : Number of cups of coffee to fill world record coffee cup = x

Thus as we know :

[tex]{\text {Number of cups of coffee to fill world record coffee cup}}\times {\text {Volume of cup of coffee}}={\text {Volume of largest cup (world record coffee cup) of coffee}}[/tex]

Putting in the values we get:

[tex]x\times 318ml=7608678ml[/tex]

[tex]x=23927[/tex]

Thus 23927 cups of coffee would be required to fill the world record coffee cup.

Answer:

0.057 L

Explanation:

Data obtained from the question include:

Initial temperature (T1) = 25°C

Initial pressure (P1) = 1 atm

Initial volume (V1) = 10 L

Final temperature (T2) = 25°C

Final pressure = 175 atm

Final volume =.?

From the data obtained from the question, we can see that the temperature is constant. Therefore, we shall apply the Boyle's law equation to determine the new volume of air. This is illustrated below:

P1V1 = P2V2

1 x 10 = 175 x V2

Divide both side by 175

V2 = 10/175

V2 = 0.057 L

Therefore, the volume of air which can be stored when the tank is compressed is 0.057 L

Answer:

yes very much

Explanation:

Answer:no Not really its Neutral

Explanation:

Answer:

The correct answer is C. Hund's rule.

Hund's rule states that for atoms in their ground state, electrons will occupy orbitals of the same energy level one by one before pairing up. This means that when filling the 3p sublevel, phosphorus should have one electron in each of the three 3p orbitals before any of them start pairing up.

However, in reality, sulfur has a lower ionization energy than phosphorus. This means that it is easier to remove an electron from sulfur than from phosphorus. This contradicts the expectation based on Hund's rule.

Therefore, the fact that sulfur has a lower ionization energy than phosphorus provides evidence that Hund's rule is not the only factor governing the electron configuration and ionization energies of elements. Other factors, such as electron-electron repulsion and the stability of half-filled or filled subshells, also play a role.

Answer:

B is the correct option

Explanation:

K= the ratio of product of concentration of products to the product of concentration of reactants raised to power equal to their cofficients.

Answer:

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Explanation:aaaaaaa

Answer:

As a general rule, soluble ionic compounds, strong acids, and strong bases should be written as dissociated ions in the complete ionic equation. Insoluble salts and weak acids are written using the neutral molecular formula since they only dissociate to a very small extent in water.

Explanation:

Answer:

The correct option is;

B. -112 kJ

Explanation:

The parameters given are;

N (g) + O₂ (g) → NO (g) ΔH = 90 kJ/mol

N (g) + O₂ (g) → NO₂ (g) ΔH = 34 kJ/mol

The required chemical reaction is given as follows;

2NO (g) + O₂ (g) → 2NO₂ (g)

Therefore, the heat of formation of 2 moles of NO = 2 × 90 = 180 kJ

The heat of formation of 2 moles of NO₂ = 2 × 34 = 68 kJ

Hence, given that the heat of formation of O₂ at room temperature = 0 kJ/mol, we have;

Change in enthalpy of the chemical reaction = Heat of formation of the products - Heat of formation of the reactants

Change in enthalpy of the chemical reaction = 68 kJ - 180 kJ = -112 kJ

Change in enthalpy of the chemical reaction = -112 kJ.

Answer:

-112

Explanation:

got it right on test

Answer:

The subsrance that increases OH ion concentration.

Explanation:

Answer:

A)P5010

Explanation:

Penta- means 5 and deca/deco- means 10

Answer:

B) BaSO₄ and C) Mg₃(PO₄)₂

Explanation:

We can use the solubility rules to decide which substances are insoluble.

You have probably learned NAG SAG and "Cats Cradle Old People," Sally Said.

I've listed them below.

[tex]\begin{array}{lll}\textbf{Soluble} & \textbf{Insoluble}\\\textbf{N}\text{itrates} &\textbf{C} \text{arbonates }\\ \textbf{A}\text{cetates} & \textbf{C}\text{hromates}\\ \textbf{G}\text{roup 1} & \textbf{O}\text{ hydrOxides}\\ & \textbf{P} \text{hosphates}\\\textbf{S}\text{ulfates} &\textbf{S} \text{ulfites}\\ \textbf{A}\text{mmonium}& \textbf{S}\text{ulfides}\\\textbf{G}\text{roup 17} & \\\end{array}[/tex]

These aids help you remember that:

The salts of Group 1 metals are soluble (Li₂CO₃ and KOH).

Sulfates are usually soluble, except for BaSO₄. Thus, BaSO₄ is insoluble.

Phosphates are insoluble — Mg₃(PO₄)₂

The two insoluble compounds are BaSO₄ and Mg₃(PO₄)₂.

Answer:  Charlotte, because baking causes a chemical change, but melting objects is a non-chemical change.

Explanation: Baking is a chemical change you cant turn it back to what it was before. Its chemical properties have changed. Melting is a physical change. Its chemical properties are still the same it has not changed. It just changed it's physical form but the object is still the object.

Answer:

Charlotte, because baking causes a chemical change, but melting objects is a non-chemical change.

Explanation:

took the quiz on edge

Answer:

The answer is option D.

A weakly basic solution

Hope this helps.

Answer:

Explanation: Apex a weakly acidic solution

Answer:

-1.76201864

Explanation:

0.00325136 - 1.76527 = 1.76201864

The concept of significant figures are mainly used by scientist and engineer to know the significance of digits in a measurement. Therefore, -1.76201 is the value on applying mathematical operation.

Significant figures are the figures that indicate the degree of accuracy of a value. It tells about the precision of a value. It gives an idea about the digits that are necessary to indicate the experimental value.

Rules for counting significant figures are:

Number between 1 to 9 is always significant

Zeroes after a number has got no significance

Zeroes before a number has got no significance

Zeroes between number has got significance

0.00325136 - 1.76527

= -1.76201

Therefore, -1.76201 is the value on applying mathematical operation.

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Amino acid is the type of molecule shown in the image.

Amino acids are small molecules that are the building blocks of proteins.

Amino acids are the smaller component pieces, called monomers, that are joined together to make the longer strand, or polymer, which is a protein.  Amino acids are joined by covalent bonds called peptide bonds to make a polypeptide chain, which eventually creates proteins in our cells.  There are 20 different amino acids in our cells that come together in a unique order to create the proteins organisms need.

Hence, an amino acid is the type of molecule shown in the image.

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Answer:

B.9

Explanation:

Students: 30

Total counts: 21 + ?

3+6+6+4+2 = 21

30-21 = 9

The missing value in the table is 9                                                                                                                                          

Answer:

Since the equation is balanced, So it have same number of oxygen in the  reactants and well as product.

Oxygen in product = 8

Oxygen in reactant = 8

Answer:

Explanation:

i got prove thoooooo

Answer:

b. hydrogen bonding.

Explanation:

Hope it helps.

Answer:

the electron releases engery in the form of light

Explanation:

it's science i don't know how to explain sorry

Answer:c

Explanation:

Answer:

the epigenetic perspective. ... Such variation among organisms with virtually identical chromosomal DNA sequences has largely been attributed to the effects of environment.Explanation:

Answer:

The answer is D

Explanation:

Pls mark as brainliest

Answer:

molar mass of carbon tetrafluoride (CF4) is

(12.01 × 1 ) + ( 4 × 19.00)

= 12.01 + 76

= 88.01u

= 88u

Hope this helps

Answer:

D. The kinetic energy will increase

Explanation:

Answer:

Hello

I think the third one is correct.

Explanation:

Because when we increase the temperature of a gas the increasing give energy to gas molecules.

Good luck.

Answer:

Molecules are speeding up as boiling occurs.

Explanation:

We have three states of matter;solid liquid and gas. Substances are found in these different states of matter according to the degree of energy and velocity of its particles. Highly energetic particles moving at high velocities are found in the gaseous state. Less energetic particles moving at lesser velocities due to intermolecular forces are found in the liquid state while particles with the least degree of freedom are found in the solid state. Solid particles do not translate but can vibrate or rotate about a fixed position.

When a liquid boils, particles at the surface of the liquid acquire sufficient energy and escape the surface of the liquid. This is because, as energy is supplied in the form of heat during boiling, molecules acquire sufficient energy to speed up their molecular motion and escape the liquid surface as vapour.

Molecules are speeding up as boiling occurs is the statement that best describes the process of arrow 1.

Evaporation is a physical process in which matter transforms from a liquid state to a gaseous state. Generally this process occurs when matter is exposed to high amounts of energy.

When a material is exposed to energy, its particles begin to move and speed up until they break their bonds and are released in the form of gas.

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Answer:

Electron=14

Explanation:

Protons = Electron,

that is why the +1 indicates the affinity of loosing an electron.