I have homework to do please help.

Molecular weight of KCl = 74.55 g/mol

So, in 74.55 g of KCl = 1 mole of KCl is present

⇒ In 1 g of KCl = 1/74.55 mole of KCl

⇒ In 335.7 g of KCl = 1 x 335.7/74.55 moles of KCl

⇒ In 335.7 g of KCl, 4.503 moles of KCl are present.

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Ionic bonds form between metals and nonmetals.

Ionic bonds, also known as electrovalent bonds, are a type of linkage created in a chemical molecule by the electrostatic attraction of ions with opposing charges. When the valence (outermost) electrons of one atom are permanently transferred to another atom, a bond of this kind is created.

If an atom receives electrons, it becomes a negatively charged ion (anion), but if it loses them, it becomes a positively charged ion (cation).

An ionic bond is essentially the most extreme form of a polar covalent bond, with the latter occurring when electrons are shared unevenly as opposed to fully. Covalent bonds arise when the electronegativities of the two atoms are similar, but ionic bonds often form when there is a large difference. Covalent bond is compared.

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The type of observation the data represent is a quantitative observation.

Quantitative observation can be described as a method of gathering and analyzing data. Quantitative observation  uses numerical data and statistical calculations to measure research and draw conclusions. It usually involves variables with a numerical value.

From the data given above which are in numerical dorm, we can conclude that the observation represented is a quantitative observation.

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Step 1: Let's calculate the quantity in moles of anhydrous barium chloride using the resulted mass after the heating divided by its molar mass (molar mass of BaCl2 is 208.23 g/mol)

so:

8.57/208.23 = 0.04 moles of BaCl2

Step 2: Now let's calculate the quantity in moles of water. But first, we need to calculate the mass of H2O. For this, we just subtract the mass before the heating by the mass after the heating. The water evaporated because of the heat.

mass of H2O = 10.05 - 8.57 = 1.48 g

Now we divide the mass by its molar mass to find the quantity in moles (molar mass of water is 18 g/mol)

1.48/18 = 0.082 moles of H2O

Step 3: Now we determine the number ratio:

0.082/0.04 = 2

So the formula is:

Answer: a. BaCl2 x 2H2O

b. barium chloride dihydrate

Al(s) + H₂SO₄(aq) --> Al₂(SO₄)₃(aq) + H₂(g)

Consider the unbalanced equation above. volume of H₂ (in L) will be produced at 52.0°C and 755 torr if 4.85 g of Al are reacted with 125. mL of 0.140M H₂SO₄ is 6.72 L.

The balanced given equation is :

2Al(s) + 3H₂SO₄(aq) --> Al₂(SO₄)₃(aq) + 3H₂(g)

mass of Al = 4.85 g

no. of moles of Al = mass / molar mass

                              = 4.85 / 26.98

                              = 0.17 mol

2 mole of Al produce 3 mole of  H₂

0.17 moles produced =  0.255 mole of  H₂

using the formula :

PV = nRT

P = 755 torr = 0.99 atm

R = 0.82 L atm / mol K

V = nRT / P

   = (0.25 × 0.082 × 325) / 0.99

  = 6.72 L

Volume of H₂ produced = 6.72 L

Thus, Al(s) + H₂SO₄(aq) --> Al₂(SO₄)₃(aq) + H₂(g)

Consider the unbalanced equation above. volume of H₂ (in L) will be produced at 52.0°C and 755 torr if 4.85 g of Al are reacted with 125. mL of 0.140M H₂SO₄ is 6.72 L.

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Reason : The number of protons in an atom of an element is its atomic number. particle 3 has 5 protons. Thus, its atomic number is 5 .

2)The atom is called an ion when its numbers of electrons are not equal to protons . meaning, an atom can be attracted to another atom.

in this case, particle 1 has protons =4 which is not equal to the 2 number of electrons.

The final volume of the balloon is 547.4 mL.

What is final volume?
The term "Final Volume" refers to the amount of Water Allocation (expressed as a whole number of Megalitres) that was determined in line with section 3.3 and was included in an Offer.

The balloon is filled to a volume of 665.7 mL at a temperature of 24.5°C. The balloon is then cooled

at constant pressure to a temperature of 188.7 K.
The ideal gas law states that PV = nRT, where P is

the pressure, V is the volume,
n is the number of moles,
R is the universal gas constant, and
T is the

temperature. Since the pressure is constant in this problem, we can rearrange the equation to solve for

V2, the final volume of the balloon: V2 = (n/P)RT. Plugging in the given values, we get:
V2 = (n/P)(8.3144621)(188.7)
V2 = 547.4 mL

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Answer:

The sun is a young star because it's composed of many gaseous layers and made up of Hydrogen/Helium and as shown on the graph we can see that's what young stars are made of meaning the sun is just a young star.

Explanation:

The Lewis dot structure for butyl thiol.

Lewis systems, also called Lewis dot formulas, Lewis dot systems, electron dot structures, or Lewis electron dot structures, are diagrams that display the bonding among atoms of a molecule, as well as the lone pairs of electrons that could exist inside the molecule.

A Lewis structure is based totally on the idea of the octet rule, in which atoms share electrons so that each atom has 8 electrons in its outer shell. for example, an oxygen atom has six electrons in its outer shell.

A Lewis shape is a totally simplified representation of the valence shell electrons in a molecule. it is used to expose how the electrons are arranged around man or woman atoms in a molecule. Electrons are shown as "dots" or for bonding electrons as a line between the 2 atoms

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The molarity of H₃PO₄ solution is 0.017 M.

The molarity of a solution is the amount in moles of the solute present in a given volume of solution.

In a titration, the unknown molarity of a given solution can be determined using the formula below:

CaVa / CbVb = Na/Nb

where;

Equation of reaction: 3 NaOH + H₃PO₄ ---> Na₃PO₄ + 3 H₂O

From the data given:

Ca = ?

Va = 20.00 mL

Cb = 0.05 M

Vb = 20.00 mL

Ca = 0.05 * 20 * 1/20 * 3

Ca = 0.017 M

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Answer:the 1 is oxygen 2 is gills the 3 is the heart the 4 is helium the 5 is cellulose

Explanation:

Answer:

The molarity of the solution is 0.99M.

Explanation:

The molaruty if a solution represents the amount of solute moles contained in 1 liter (1000ml) of a solution.

1st) In this case, we have 17.3g of KCl, so we have to use the KCl molar mass (74.5g/mol) to convert grams into moles:

Now we know that there are 0.23 moles of the solute KCl.

2nd) We have 0.23 moles of KCl contained in 231 mL of solution, so to calculate the molarity (moles of solute contained in 1000mL of solution), we can use a mathematical rule of three:

Finally, the molarity of the solution is 0.99M.

Answer: Red

Explanation:

114.05× 10²³ molecules are present in 3.41kg or 3410g of glucose

We know the relationship between no of moles and molar mass:

 n = W / M

where,

n = no of moles = ( ?)

W = Given mass  = (3.41kg)

M = Molar mass = ( molar mass of glucose is 180g)

Convert 3.41kg into grams we get 3.41 × 1000 = 3410g

n = W / M

   = 3410 / 180

   = 18.94 moles

Number of molecules is related to no of moles and Avogadro's number as:

   N = n × NA

where,

N = no of molecules/no of particles/no of atoms = ?

n = no of moles = ( 18.94 moles - found out from above formula )

NA = Avogadro's number = ( 6.022 × 10²³ )

N = n × NA

    = 18.94 × 6.022 × 10²³

   =  114.05× 10²³ molecules

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Assuming that it is at STP (Standard Temperature and Pressure), in these conditions, 1 mol of gas is equal to 22.4 Liters of volume, therefore if we have 80 Liters of H2 gas:

22.4 L = 1 mol

80 L = x moles

x = 3.6 moles of H2 gas

Scientists define energy as the ability to do work.

In physics, power is the quantitative asset this is transferred to a frame or to a physical system, recognizable inside the overall performance of labor and within the form of warmth and light. power is a conserved quantity the regulation of conservation of electricity states that power may be converted in shape, however not created or destroyed.

Strength is defined as the capacity to do paintings, that's the ability to exert pressure inflicting displacement of an object. in spite of this complicated definition, its means is quite simple: energy is simply the pressure that causes matters to move. energy is split into sorts capacity and kinetic.

Power exists in many special forms. Examples of those are mild energy, warmth power, mechanical electricity, gravitational energy, electric energy, sound strength, chemical power, nuclear or atomic strength, and so on. every form may be converted or changed into the opposite form.

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When a negatively charged substance is brought near the ion, the ion will attract the substance because the ion has more protons than electrons.

We define an ion as a specie that either has more negative charges than positive charges, or a specie that has more positive charges than negative charges. In either case, the number of charges that you have in an ion can never be the same, the  number of one type of charge must be greater than the number of the other type of charge.

We can now see that from the table that we have in the question, the number of the positive charges is greater than the number of the negative charges. This implies that what we have is a positive charge and in consonance with the first law of electrostatics, it is going to be attracted by the negative charge.

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The major element found in our bones is calcium.

What are the essential and non-essential elements in the bones?

Animals have significant sites for storing elements in their mineralized tissues, including bone, teeth, antlers, and horns. These tissues contain the essential metals iron (Fe), zinc (Zn), manganese (Mn), and cadmium (Cd), as well as important elements including calcium (Ca), phosphorus (P), magnesium (Mg), and sulfur (S) (Cd). Numerous minerals are necessary for good animal physiology.

The main building block of bones and teeth is calcium. In addition to its function as a second messenger, calcium is critical for muscular action, blood coagulation, and membrane permeability. Calcium and phosphorus are both found in bones and teeth. Additionally, phosphorous is a component of ATP, phospholipids, nucleic acids, and other coenzymes.

Hence, calcium plays an important role in bones and also assists in the resorption of the bone.

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The first step to solve this question is to state the combustion reaction for nonane:

After this, we have to convert the given masses of nonane and oxygen to moles using their molecular masses:

Use the stoichiometric ratio to determine the number of moles of oxygen that react with 0.20 moles of nonane.

From this, we can conclude that the limiting reactant of the reaction is oxygen, which means that we have to base our calculations on the amount of oxygen that reacts. Use the stoichiometric ratio of oxygen to water to find the amount of water produced:

Convert the amount of moles to grams using its molecular mass:

To find the percent yield, divide the actual amount of water produced by the theoretical amount of water produced and multiply by 100:

The percent yield is 16.2%.

The element given in the diagram is molybdenum with symbol Mo and atomic number 42. The number of protons and electron is 42 and the atomic mass is 96.

Number of neutrons is 54. Electrons in the valence shell is 6 and number of electrons in n=3 shell is 18.

Molybdenum is 42nd element in periodic table. It is a transition metal with d4 valence shell. The atomic number of molybdenum is 42. The atomic number is the number of electrons in an atom. Thus number of electrons is 42.

Mass number of Mo is 96 it is the sum of number of protons and neutrons.

For a neutral atom, the number of electrons equal to the number of protons. Thus number of protons is 42.Number of neutrons can be found by substracting proton number from mass number.

number of neutrons = 96 -42 =54.

The electronic configuration of Mo is 2,8,18,13,1. The last 6 electrons are located in 4s and 4d orbitals. Thus number of valence electrons is 6.

The shell n = 3 is M shell. The M shell of Mo contains 18 electrons.

Therefore Molybdenum Mo is 42 nd element with protons, electrons and neutrons 42, 42, 54 respectively and have 6 outer shell electrons and 18 electrons in n=3 shell.

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Answer:

subtract the starting water level from the end water level to find the volume of the object so 65 ml - 30 ml =35 ml or 35cm cubed

Land masses are formed as a result of Tectonic forces.

Tectonic forces regularly arise while tectonic plates merge collectively or pull aside. This displaces Land masses, causing geographical functions and landforms to be created. for example,  tectonic plates pushing collectively ought to cause mountain tiers to form.

Like Lego blocks built on top of one another, big elements of the Earth's continental land loads had been created by way of tens of hundreds of short eruptions or bursts of molten magma that were transferred unexpectedly from the mantle and lower-maximum crust and then injected as huge horizontal sheets into the higher crust.

The phrase tectonic is derived from the Greek phrase tekton, which means “builder.” Tectonic techniques construct landforms in particular by using causing the uplift or subsidence of rock cloth—blocks, layers, or slices of the Earth's crust, molten lavas, or even huge hundreds that consist of the complete crust and uppermost.

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Answer:

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Explanation:

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The periodic table is arranged into rows and columns by the atomic number and valence electrons.

The elements in periodic table arranged that element with same outer electronic configuration placed in same columns.

The formal names for rows in the table are called as periods and the columns in the table are called as groups.

Each element has their own atomic number , which we explained as number of proton of its atom and defined that element.  The elements of the periodic table are arranged in the way of increasing atomic number.

First two groups are s block element , 13 - 18 p block elements, in the middle d block elements are placed and f block elements are placed separately.

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Answer: 5

Balanced Reaction:

[tex]1K_2CO_3 + 1Cu(NO_3)_2[/tex]      ⇒   [tex]2KNO_3 + 1CuCO_3[/tex]

When taking the coefficients we are left with 1 + 1 + 2 + 1 = 5

A chemical equilibrium is a state where the concentrations are not changing, in a closed system. the concentrations do not change not because the reactions are stopped but because the direct and inverse reactions are occurring at the same rate, this ongoing reactions is because it is considered a dynamic system.

La idea principal de este texto es descifrar los mecanismos por los cuales la marihuana puede causar al excitacion de las neuronas y de este modo llevar a cambios en el cerebro. La idea secundaria es comprender el rol de la dopamina como neurotrasmisor. La opinion del autor es que el consumo prolongado de canabis podria estar asociado a daño irreversible.

Las celulas nerviosas (es decir, neuronas) reaccionan de acuerdo a la presencia de neurotrasmisores en el medio extracelular, este es uno de los mecanismos que usa el sistema nervioso para responder a estimulos ambientales.

La marihuana o cannabis posee substancias psicoactivas que se asocian a receptores presentes en las membranas neuronales de modo similar a neurotrasmisores naturales tales como la dopamina.

En conclusión, este estudio trata sobre los efectos de la marihuana como sustancia psicoactiva en el cerebro y del mecanismo de accion de los neurotrasmisores, lo cual se puede asociar a los efectos de esta droga en celulas neuronales.

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a. The limiting reagent is [tex]H_2S[/tex]

b. The mass of the leftover reagent is 32.53 grams.

The limiting reagents or reactants in reactions are reagents that are available in inadequate stoichiometric quantity when compared to other reagents of the same reactions.

From the balanced equation of the illustrated reaction, the stoichiometric mole ratio of the two reactants is 1:1.

Recall that: mole = mass/molar mass

Mole of 49.8 g MgO = 49.8/40.30

                           =  1.2357 moles

Mole of 14.6 g [tex]H_2S[/tex] = 14.6/34.08

                           = 0.4284 moles

Since the mole ratio is supposed to be 1:1, it means  [tex]H_2S[/tex] is stoichiometrically limiting in availability. In other words,  [tex]H_2S[/tex] is the limiting reactant.

The excess reactant is MgO.

Excess moles = 1.2357 - 0.4284

                   = 0.8073 moles

Mass of 0.8073 moles MgO = 0.8073 x 40.30

                             = 32.53 grams.

Thus, the mass of the leftover reagent is 32.53 grams.

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ANSWER

the empirical formula is MgH8O3

EXPLANATION

Given that;

The % composition of Mg is 46.2%

The % composition of H is 7.69%

The % composition composition of O is 46.2%

Assume the mass of the sample is 100g

To find the empirical formula, follow the steps below

Step 1; Find the mass of the elements

For Magnesium

For hydrogen

For oxygen

Step 2; Find the molar mass of the elements

The molar mass of oxygen is 15.999 g/mol

The molar mass of hydrogen is 1.00 g/mol

The molar mass of magnesium is 21.904.305 g/mol

Find the mole of the element

For Mg

For Hydrogen

For Oxygen

Step 3; find the mole ratio

In the above calculations, Mg has the least number of moles. Therefore to find the mole ratio divide the moles by the smallest moles

Therefore, the empirical formula is MgH8O3