6.50×104 +8.70×105
[?]
? ]×10¹ ?

Hydrogen bonding is formed when the partial negative charge at one end of a water molecule is attracted to the partial positive charge of another water molecule

Thus, when the partial negative charge at one end of a water molecule is attracted to the partial positive charge of another water molecule, hydrogen bonding is formed.

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The sum of coefficients when the above-mentioned equation is balanced is 12.

A chemical equation is a symbolic representation of a chemical reaction where reactants are represented on the left, and products on the right.

A chemical equation is said to be balanced when the number of atoms of each element on both sides of the equation is the same.

According to this question, calcium hydroxide reacts with phosphoric acid as follows:

3Ca(OH)₂ + 2H₃PO4 → Ca₃(PO4)₂ + 6H₂O

The sum of the coefficients of the above balanced chemical equation is 3 + 2 + 1 + 6 = 12.

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The [H₃O⁺] of a 0.150 M solution of benzoic acid is 0.00515 M.

Benzoic acid is classified as a weak acid and it dissociates partially when it is dissolved in water. Benzoic acid has chemical formula as C₆H₅COOH and it produce the benzoate anion which is [C₆H₅COO⁻] with a hydronium cation which is [H₃O⁻].

We know that constant Ka = 1.77 x 10⁻⁴

We will write the equilibrium reaction as -

C₆H₅COOH + H₂O    →    H₃O⁺ + C₆H₅COO⁻

0.150 M           x                 x              x

Ka = [H₃O⁺] [C₆H₅COO⁻]

             C₆H₅COOH

1.77 x 10⁻⁴ =    x₂    

                   0.150

We will solve to get the value of x -

x = [H₃O⁺] = 0.00515 M

Therefore, [H₃O⁺] is 0.00515 M.

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2 oxygen ions

Oxygen is a non-metal with an atomic number of 8. The electronic configuraton of the element is given as:

If a an unknown metal with a charge of 4 combines with oxygen, the required reaction will be:

Since oxygen is in group VI of the periodic table and has a oxidation number of -2, to form a neutral compound with charge of +4, this means that 2 oxygen ion will combine with the metal to form a neural compound MO2

According to the Planck's equation,the energy and frequency of blue light are 4.699×10[tex]^-19[/tex] J and 2.363×10⁶ m[tex]^-1[/tex] respectively.

Max Planck discovered the theory which stated that energy is transferred in the form of discrete packs which are called quanta and thus proposed an equation called the Planck's equation which relates energy and frequency of a photon and is given as, E=hcυ or in terms of wavelength it is ,E=hc/λ.

The equation makes use of a constant which is called the Planck's constant and it's value is 6.626×10[tex]^-34[/tex] Js.

In the given problem, energy is calculated as,E=6.626×10[tex]^-34[/tex]×3×10⁸/4.23×10[tex]^-7[/tex]=4.699×10[tex]^-19[/tex] J.

The frequency  of light is calculated as follows,4.699×10[tex]^-19[/tex]/19.878×10[tex]^-26[/tex]=2.363×10⁶ m[tex]^-1[/tex].

Thus , the energy and frequency of blue light are  4.699×10[tex]^-19[/tex] J and 2.363×10⁶ m[tex]^-1[/tex] respectively.

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Explanation:

endothermic because absorbing

energy

H2O is absorbing heat to release hydrogen and oxygen gas. any reaction that requires energy from outside is endothermic.

Answer:

Explanation:

Here, we want to get what will happen when an Atthenius base interacts with water

By definition, an Arrhenius base increases the concentration of hydroxide ions in aqueous solutions

What this simply mean is that when an Arrhenius base comes in contact with water, the solution is expected to have an increase in the concentration of hydroxide ion. This can be measures pH wise and we expect an increase in the pH of the solution from 7

Answer:

False. F-F would be a covalent apolar molecule.

Explanation:

As we have two elements bonded of the same element, in this case, F (fluorine), they would be sharing electrons, making that the bonding is covalent but there are no charges, because they're the same element, so it would be a completely covalent apolar molecule.

1) Set the chemical equation

2) Find out how many moles of HCl react in the solution.

3) Find out how many moles of NaOH reacted with HCl

4) Find out the milliliters of NaOH

There are many legends of the North Star that have been told over the years by different civilizations and of them is a mythical story told about the existence of the star.

It is said that it is a little dot left behind after God created the stars and based on the fact that the dot was not like the other stars as it was almost an afterthought and then it came to the attention of Luminaria who granted the dot its wish and it became a real star like the others and became the Star of Bethlehem.

Hence, it can be seen that the given legend and mythical stories are just one of the many ways humans try to understand the phenomena of astrology and how they attach certain significance to it.

With this in mind, it is very clear to see that the North Star is a special star.

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Explanation

There are said to have two different conditions of a gas.

First condition is STP which means: pressure = 1 atm and temperature (absolute) = 0 °C + 273 = 273 K

-------------

It is said that the temperature remains constant, therefore we can apply Boyle's law which states that the pressure of a gas tends to decrease as the volume of the container increases.

The difference between ionization and dissociation : Ionization breaks ionic bonds, and dissociation breaks covalent bonds.

Ionization breaks the ionic bond into its constituent ions while dissociation is breaking of bond into its simple constituent. Ionization is a irreversible process and dissociation is reversible process. The bond involves in the process of ionization is ionic bond and the bond involved in the process of dissociation is the covalent bond. The compound related to ionization is ionic compound and the compounds related with dissociation is covalent compound.

Thus, The difference between ionization and dissociation :

(A) Ionization breaks ionic bonds, and dissociation breaks covalent bonds.

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When Katarina finds a stain at a crime scene the first thing she should do is to scrape the substance into a plastic bag. That is option B.

A forensic scientist is a professionally trained individual that applies their knowledge in the field of criminology by using evidence found on the crime scene to narrow down a suspect.

When a stain is being noticed by the forensic scientist, the first step should be to secure the stain for further investigation.

To secure the stain, the scientist should scrap the stain into a plastic bag and this should be taken to the laboratory for further evaluation and investigation.

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Explanation:

Titration is a technique used to determine the amount of matter in a sample using a solution of known concentration. In other words, titration is a quantitative chemical analysis. In this process, the sample has its concentration determined through a chemical reaction when it is mixed with another substance. The use of pH indicators in this process is useful to determine the endpoint of the titration, indicating that the entire sample has reacted. Titration is used to accurately determine the amount of a substance, confirm that the concentration described on the label is true or that the amount of a chemical compound is indicated on the package.

Sample weighing: With the solid sample on a watch glass, weigh it on the balance.

Sample dissolution: The sample is transferred to an Erlenmeyer flask with water, where dissolution takes place.

Problem solution: The solution is transferred to a volumetric flask and the volume is made up with water, creating the problem solution.

Aliquot transfer: Remove an aliquot of the problem solution with the aid of a pipette and transfer it to an Erlenmeyer flask.

Titration: To the Erlenmeyer flask, the problem solution (titrated) is added and the solution of known concentration (titrant) is inserted into the burette.

An acid-base indicator is also added to the titrator to indicate when the titration should be stopped due to the color change. The color change indicates the end point or turning point of the titration.

After that, when the color change persists, the volume of titrant used is verified and stoichiometric calculations will help us to discover the concentration of the titrated solution.

Answer:

Step 1 - Sample weighing: With the solid sample on a watch glass, weigh it on the balance.

Step 2 - Sample dissolution: The sample is transferred to an Erlenmeyer flask with water, where dissolution takes place.

Step 3 - Problem solution: The solution is transferred to a volumetric flask and the volume is made up with water, creating the problem solution.

Step 4 - Aliquot transfer: Remove an aliquot of the problem solution with the aid of a pipette and transfer it to an Erlenmeyer flask.

Step 5 - Titration: To the Erlenmeyer flask, the problem solution (titrated - basic solution) is added and the solution of known concentration (titrant - acidic solution) is inserted into the burette.

Step 6 - An acid-base indicator is also added to the titrator to indicate when the titration should be stopped due to the color change. The color change indicates the endpoint or turning point of the titration.

Step 7 - After that, when the color change persists, the volume of titrant used is verified and stoichiometric calculations will help us to discover the concentration of the titrated solution.

To calculate the number of atoms of any compound it is necessary to use the Avogadro constant. This is a constant of proportion between the amount of matter and the number of entities that are linked to that amount. These entities can be atoms, molecules, ions, electrons, protons, neutrons. The value of the Avogrado constant is 6.022 x 10^23 mol^-1.

So to calculate the number of atoms in 275 grams of iron (III) hydroxide:

- First you need to transform grams into moles

- transform moles into atoms/molecule using Avogrado constant.

- To transform 275 grams of Fe(OH)₃ you need to use the molecular mass of Fe(OH)₃ and the following equation: mole = mass/molar mass

Molecular mass of Fe(OH)₃:

Fe - 55.85

O - 16

H - 1

(1x55.85) + (3x16) + (3x1) = 106.86 g/mol

Replace the value in the equation:

mole = 250/106.86

mole = 2.34 mole of Fe(OH)₃

- Now, let's solve the number of molecules of Fe(OH)₃ into 2.34 mole of Fe(OH)₃:

6.022 x 10^23 molecule --- 1 mol

x molecule ---- 2.34 mole

x = 1.41 x 10^24 molecules of Fe(OH)₃

Answer: There are 1.41 x 10^24 molecules of Fe(OH)₃

10.81amu

In order to get the average atomic mass of an element, we need the following parameters:

• Natural Abundance (NA),: The percentage of atoms for an element that is a specific isotope.

• Mass (m) ,of each isotope

For the given element (Boron-10 and Boron-11), the natural abundances are 19.78% and 80.22% respectively.

The atomic masses of Boron-10 and Boron-11 are 10.0129amu and 11.0093amu respectively

The formula for calculating the average atomic mass of the element is expressed as:

Substitute the given parameters into the formula to have:

Simplify the resulting expression to have:

Therefore the average atomic mass of Boron is 10.81amu to two decimal places.

70.0 mL of water was added to 100.0 mL of 0.250 M CaCl₂ solution. Assuming the volumes are additive,  The CaCl₂ concentration in the diluted solution is 0.147 M.

given that :

volume V1 = 100 mL

volume V2 = 100 + 70 = 170 mL

Molarity M1 = 0.250 M

Molarity M2 = ?

using dilution equation we get :

M1 V1 = M2 V2

M2 = ( M1 V1) / V2

M2 = ( 0.250 × 100 ) / 170

M2 = 0.147 M

Therefore , the dilution solution will have 0.147 M

Thus, 70.0 mL of water was added to 100.0 mL of 0.250 M CaCl₂ solution. Assuming the volumes are additive, what is the CaCl₂ concentration in the diluted solution is 0.147 M.

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Answer:

Explanation:

Here, we want to get the molar volume of the gas

At STP, 1 mole of a gas occupies a volume 0f 22.4 dm^3

The conditions at STP are 273K

STP stands for Standard Temperature and Pressure. Nowadays the STP is temperature of 0°C (273.15K) and pressure of 1 bar.

Assuming the gas behaves as an ideal gas, in these conditions the volume of each mol of gas is approximately 22.7 L.

Using rule of three, we can calculate the volume of 0.001 mol of H₂S:

Volume --- Number of moles

x --- 0.001 mol

22.7L --- 1 mol

So, the volume is approximately 0.0227 L.

Answer

wiring

Explanation

Ancient humans did make jewelry, weapons and tools by smoltering ore, however, they did not make wires, hence there was no electricity in many mnay years ago.

The relationship between the number nodes,  the energy level n and the azimuthal quantum number l is (n-l -1) + l. Thus the total number of nodes is n-1.

Node is the region or point in the orbital where the probability of finding an electron is zero. Electrons are revolving around circular paths of fixed energy levels.

The principal quantum number n represents the number of main shells or the energy level of the electrons. Whereas, azimuthal quantum number represents the number of orbitals denoted as l.

The point where there is a probability of finding an electron is called antinode. The total node in an orbital is the sum of number of planar nodes and number of spherical nodes.

Thus total number of nodes =  (n-l-1) + l

                                               = n - 1.

Therefore, the total number of nodes is n-1. For example for n=3 level there will be two nodes.

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Theoretical yield is calculated based on the stoichiometry of the chemical equation. First, we have to find the number of moles of each reactant using the molar mass of each of them. You can find the molar mass using the periodic table: the molar mass of aluminum (Al) is 26.98 g/mol and the molar mass of chlorine gas (Cl2) is 70.8 g/mol:

The next step is to find how many moles of AlCl3 are produced by each reactant. You can see that in the chemical equation, 2 moles of Al produces 2 moles of AlCl3:

And 3 moles of Cl2 produces 2 moles of AlCl3:

You can realize that the maximum, amount of moles that are produced of AlCl3 is 0.367 moles because Cl2 would be the limiting reactant and there is an excess of Al. For this value, we have to find its mass using the molar mass of AlCl3 which is 133.2 g/mol:

The answer would be that the theoretical yield of AlCl3 is 48.88 g.

The first thing will be to finish the reaction that happens in the experiment to the reactional HCl and sodium bicarbonate (NaHCO3). The balanced reaction is the following:

Now, we must determine which is the limiting reactant. To do this we are going to convert all the data they give us to moles.

For HCl we are given the molarity, so the moles will be:

Now the moles of sodium bicarbonate are found using its molar mass:

By stoichiometry, we have that one mole of NaHCO3 reacts with one mole of HCl. We have more moles of NaHCO3 than HCl. Therefore, HCl will be the limiting reactant.

So the reaction will occur according to the number of moles of HCl. Now the ratio between HCl and CO2 gas formed is 1 to 1. For one mole of HCl that reacts, 1 mole of CO2 will be formed.

so, the number

The International System of Units uses the mole (symbol: mol) as the unit of substance amount.

In 5.67 moles of CO2 there exists 249.48 grams of CO2.

Start by dividing the number of atoms by the atomic weight of each component of the compound to convert grams to moles. After that, tally up all of your responses to determine the compound's molar mass. The final step is to calculate the number of moles by dividing the number of grams of the compound by its molar mass.

The International System of Units uses the mole (symbol: mol) as the unit of substance amount. How many elementary entities of a particular substance are present in an object or sample is determined by the quantity of that substance.

Let the equation be

Mass = relative atomic mass × mole number

substitute the values in the above equation, we get

= 5.67 × (12 + 16 + 16)  

= 249.48 g

Therefore, there exists 249.48 grams of CO2 are in 5.67 moles of CO2.

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The balanced chemical equation for 0.1 M barium nitrate and 0.1 M sodium sulfate is -

2 Ba(NO₃)₂ + 2 Na₂SO₄   →   2 Ba(SO₄) + 2 NaNO₃

Balanced chemical equation are the equations having equal amount of reactants and the products formed. The reactants are placed on the left and products are placed on right forming a balanced chemical equation.

When 0.1 M barium nitrate reacts with the 0.1 M sodium sulfate, it gives an insoluble salt of barium sulfate and soluble salt of sodium nitrate as the product. This reaction is a type of precipitation reaction as precipitate is formed in the reaction. It is a double displacement reaction because the sulfate ions replace the nitrate ions to give the product.

Barium sulfate is known to be the most insoluble compound. It is formed as a precipitate.

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If you only have the percent composition of each element in a give compound, you can't determine yet the empirical formular for the compound. The problem is, the percent composition only gives relative numbers for each element. What can be determined is the empirical stochiometry of one element relative to the others.

For example, supose you have a compound with element X and Y, with the percent composition you can determine how much X you have relative to how much Y you have. Say you determine that for each 2 X you have 3 Y, the formula can be X₂Y₃ but it can also be X₄Y₆ or even othre possibilities.

To determine the empirical formula you need to know how many of one of the elements you have in each compound. A common way of getting the empirical formula is to use the percent composition and, in addition, the molar mass of the compound, which will make it possible to get the empirical formula from the relative ratios of each element you have.

Answer:

61.09 grams SmO

Explanation:

To find the number of grams SmO, you need to multiply the moles by the molar mass of SmO. The molar mass is a ratio which represents the mass of SmO per every 1 mole. It is important to arrange the ratio in a way that allows for the cancellation of units (moles should be in the denominator). The final answer should have 4 sig figs like the given value (0.3672 = 4 sig figs).

Atomic Mass (Sm): 150.36 g/mol

Atomic Mass (O): 15.999 g/mol

Molar Mass (SmO): 150.36 g/mol + 15.999 g/mol

Molar Mass (SmO): 166.359 g/mol

 0.3672 moles SmO           166.359 grams
--------------------------------  x  --------------------------  =  61.09 grams SmO
                                                   1 mole

In this question, we have the following reaction:

C2H6 -> C2H4 + H2

As we can see, we had two hydrogen atoms being decomposed from the original molecule, therefore we had 2 bonds being broken, and bond breaking is an endothermic process, because it requires energy in order to occur, therefore we have as the best answer, letter D, or 4th option

Answer:

Bones, teeth, shells, and other hard body parts can be fairly easily preserved as fossils. However, they might become broken, worn, or even dissolved before they are buried by sediment. The soft bodies of organisms, on the other hand, are relatively hard to preserve.

Usually, scientists will collide a large isotope such as Uranium-235 with a neutron. The collision results in several more nuclear fissions, also known as a chain reaction. This results in a HUGE release of energy!

Nuclear fission is a type of nuclear reaction in which a large isotope such as uranium-235b is split into two or more smaller isotopes with the release of large quantities of energy and radiation.

The process of nuclear fission in large isotopes can be initiated by colliding or bombarding these large isotopes with fast-moving neutrons which splits the nucleus of the atom, releasing energy ad more neutrons that will split more atoms of the large isotope, resulting in a chain reaction.

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