The wood in my house is crumbling. *

Problem

Hypothesis

Law

Theory

Answer:

1. EF = PSCl₃; 2. MF = PSCl₃  

Explanation:

1. Empirical formula

The empirical formula is the simplest whole-number ratio of atoms in a compound.

The ratio of atoms is the same as the ratio of moles.

So, our first job is to calculate the molar ratio of P:S:Cl.

Assume 100 g of the compound.

(a) Calculate the mass of each element.

Then we have 18.28 g P, 18.93 g S, and 67.28 g Cl.

(b) Calculate the moles of each element

\(\text{Moles of P} = \text{18.28 g C} \times \dfrac{\text{1 mol P}}{\text{30.97 g P}} = \text{0.5902 mol P}\\\\\text{Moles of S} = \text{18.93 g S} \times \dfrac{\text{1 mol S}}{\text{32.06 g S }} = \text{0.5905 mol S}\\\\\text{Moles of Cl} = \text{62.78 g Cl} \times \dfrac{\text{1 mol Cl}}{\text{35.45 g Cl }} = \text{1.771 mol Cl}\)

(c) Calculate the molar ratio of the elements

Divide each number by the smallest number of moles

P:S:Cl = 0.5902:0.5905:1.898 = 1:1.000:3.000 ≈ 1:1:3

(d) Write the empirical formula

EF = PSCl₃

The empirical formula for this compound is PSCl₃.

2. Molecular formula

(a) Calculate the ratio of the molecular and empirical formula masses

n = (169.4 u)/(169.40 u) = 1.000 ≈ 1

(b) Calculate the molecular formula

MF = (EF)ₙ = (EF)₁ = PSCl₃

The molecular formula for this compound is PSCl₃.

From the calculation, the compound is MgSO4.2H2O.

A hydrated salt is a salt that contains molecules of the water of crystallization.

a) Percentage of the water of crystallization =  3.211 g  - 2.539g/ 3.211 g * 100/1 = 21%

b) Number of moles of water of crystallization = 3.211 g  - 2.539g/ 18 g/mol =

0.037 moles

c) Number of moles of anhydrous salt =  2.539g/120 g/mol = 0.021 moles

Number of moles of hydrated salt = 3.211 g/120 + 18x

Hence;

0.021 = 3.211 /120 + 18x

0.021(120 + 18x) =  3.211

2.52 +  0.378x = 3.211

0.378x  = 3.211  - 2.52

x = 3.211  - 2.52/ 0.378

x = 2

Hence the compound is MgSO4.2H2O

Learn more about hydrated salt:https://brainly.com/question/5586505

#SPJ1

Answer:

E = 5.69x10⁻²⁸m

Explanation:

To solve this question we neeed to convert the wavelength in meters to energy in joules using the equation:

E = hc / λ

Where E is energy in joules, h is Planck's constant = 6.626x10⁻³⁴Js

c is light constant = 3.0x10⁸m/s

And λ is wavelength in meters = 349m

Replacing:

E = 6.626x10⁻³⁴Js*3.0x10⁸m/s / 349m

E = 5.69x10⁻²⁸m

The energy of the wavelength at which the local AM radio station is broadcasting is: A. \(5.69 \times 10^{-19}\;J\)

Given the following data:

Scientific data:

To calculate the energy of the wavelength at which the local AM radio station is broadcasting, we would apply Einstein's equation for photon energy:

Mathematically, Einstein's equation for photon energy is given by the formula:

\(E=\frac{hv}{\lambda}\)

Where:

Substituting the given parameters into the formula, we have;

\(E=\frac{6.626 \times 10^{-34}\times 3 \times 10^8}{3.49 \times 10^{-7}}\\\\E=\frac{1.99 \times 10^{-25}}{3.49 \times 10^{-7}} \\\\E=5.69 \times 10^{-19}\;Joules\)

Read more on wavelength here: https://brainly.com/question/14593563

Answer:

a.2.55e-7

b.6830

Explanation:

Answer:

The answer is 76.36 torr

Explanation:

using P1V1=P2V2

Since temperature did not change

P2=P1V1/V2

P2=262×21/75

P2=73.36 torr

Answer:

B

Explanation:

Atoms of different elements have different atomic structures because they contain different numbers of protons and electrons. Here the given atomic models represent Beryllium, Be, and boron, B. The correct option is D.

An atomic model refers to the structure of an atom which comprises of a nucleus at the centre in which the protons and neutrons are present. The positively charged particles are called protons, negatively charged particles are called electrons whereas neutrons are neutral.

The number of protons or electrons in atom is known as the atomic number. The sum of number of protons and neutrons is called the mass number. Neutral atoms have equal numbers of protons and electrons.

Here 'Be' atom has 4 protons and hence its atomic number is 4, similarly 'B' atom has 5 protons and its atomic number is 5.

Thus the correct option is D.

To know more about atomic models, visit;

https://brainly.com/question/19719692

#SPJ2

The gas law that is calculated with the pressure and volume variables at a constant temperature is Boyle's Law. Boyle's Law states that the pressure (P) of a gas is inversely proportional to its volume (V) when temperature (T) is held constant.

Mathematically, it is expressed as P₁V₁ = P₂V₂, where P₁ and V₁ represent the initial pressure and volume, and P₂ and V₂ represent the final pressure and volume.According to Boyle's Law, if the volume of a gas is reduced while keeping the temperature constant, the pressure will increase proportionally.

Similarly, if the volume is increased, the pressure will decrease. This relationship holds as long as the temperature remains constant throughout the process. Boyle's Law is one of the fundamental gas laws and provides insights into the behavior of gases under changing pressure and volume conditions at a constant temperature.

For more such questions on gas law

https://brainly.com/question/30233942

#SPJ11

Answer:

7.93 × 10⁻¹³ km/s

Explanation:

Step 1: Given data

Rate of growth of the fingernails (r): 2.50 cm/year

Step 2: Convert "r" from cm/year to km/year

We will use the following conversion factors.

\(\frac{2.50cm}{year} \times \frac{1m}{100cm} \times \frac{1km}{1000m} = 2.50 \times 10^{-5} km/year\)

Step 3: Convert "r" from km/year to km/s

We will use the following conversion factors.

\(\frac{2.50 \times 10^{-5} km}{year} \times \frac{1year}{365day} \times \frac{1day}{24h} \times \frac{1h}{60min} \times \frac{1min}{60s} = 7.93 \times 10^{-13} km/s\)

2.50 cm/year is equal to 7.93 × 10⁻¹³ kilometers/second.

Perch, frog, pigeon, and other species evolution would not have arisen prior to the derived shared trait of jaws and after the common ancestor.

The development of jaws in the bodies of our ancestors was a critical phase in the evolution of vertebrates, including humans. The earliest jawed vertebrates, called gnathostomes, descended from jawless fish and appeared in the fossil record around 420 million years ago.

Rats and people are both warm-blooded creatures that give birth to live children; both have similar organs, such as hearts and livers; both have comparable neurological systems; both employ comparable hormones to regulate body functions.

To know more about evolution visit:-

https://brainly.com/question/13484097

#SPJ1

Answer:

Molecular formula for the organic compound is:  C₉H₁₈O₃

Explanation:

We determine the combustion reaction:

CₓHₓOₓ  +  O₂  →  CO₂  +  H₂O

We don't know the subscrip of the organic compound, that's why we put x.

Notice we have C in the compound and in CO₂. Let's find out the mass of C.  1 mol of CO₂ contains 1 mol of C

Then (7.950 g /44g/mol) of CO₂ may contain ?

(7.950 g /44g/mol) represents the moles of dioxide → 0.181 moles of C

These moles came from the mass of the organic compound, the 3.498 g.

So now, we can know the subscript for C.

If 3.498 g of the compound contain 0.181 moles of C

174.27 g of the compound may contain (174.27 .  0.181)/ 3.498 = 9

Let's do the same for the H.

1 mol of water contain 2 moles of H

(3.255 g /18 g/mol) of water, may contain  ?

3.255 g /18 g/mol = 0.181 moles . 2 = 0.362 moles of H

These moles came from the mass of the organic compound, the 3.498 g.

Let's find out the subscript for H

If 3.498 g of the compound contain 0.362 moles of H

174.27 g of the compound may contain (174.27 .  0.362)/ 3.498 = 18

Organic compound is C₉H₁₈Oₓ. If the molar mass is 174.27 g we can easily determine the moles of O

12 g/mol . 9 + 1 g/mol . 18 + 16 g/mol . X = 174.27 g/mol

(174.27 g/mol - 12 g/mol . 9 - 1 g/mol . 18 ) / 16 = 3

Molecular formula for the organic compound is:  C₉H₁₈O₃.  Therefore the complete combustion reaction is:

C₉H₁₈O₃  +  12O₂  →  9CO₂  +  9H₂O

Answer:

The formal charge on P would be 0 for this structure.

Explanation:

oyegen and hydrogen

4 oxegens

Answer:

Oxygen

Explanation:

Answer:

50 lbs

Explanation:

the mass would still be the same but you woulddivide the weight in half due to gravity

Answer:

50

Explanation:

On Earth => 100 lbs and x gravity

On Planet A=> ? lbs and x/2 gravity

? = 100/2

? = 50

Hope this helps ^-^

If one of the elements is a metal and the other is a nonmetal, they will most likely form an ionic bond. Monatomic cations and anions make up these kinds of ionic compounds.

The reactivity of an atom—or propensity to establish chemical interactions with other atoms—depends on the amount of electrons in its outermost shell.

The number of protons in a particular atom, which is an element's smallest building block, is how an element is defined. A compound, on the other hand, is made up of different atoms, and the smallest component of a compound is a molecule.

To know more about ionic compounds visit:-

brainly.com/question/3222171

#SPJ1

(E, E)-3,5-octadiene, molecular formula is C8H14, molecular weight is 110.20,(3E,5E)-octa-3,5-diene is its IUPAC name.

What is IUPAC?

The International Union of Pure and Applied Chemistry (IUPAC) is a global federation of National Adhering Organizations dedicated to the progress of the chemical sciences, particularly through the creation of nomenclature and terminology. It is an International Science Council member (ISC).

What is the Molecular formula?

A molecule is made up of two or more atoms that have joined together chemically. A molecular formula is the chemical representation of a molecular compound that lists the types and quantities of atoms that make up each molecule.

Hence, the structure of the compound (E, E)-3,5-octadiene is in the image attached. The image is from Pubchem, National library of medicine (NCBI).

To know more about Molecular formula, check out:

https://brainly.com/question/23948807

#SPJ9

When the grain size is reduced to 0.160 pm, the strength of mild steel is 1851 MPa.There are a number of variables that can affect mild steel's strength, including the grain size, which is controllable.

We may use the above information to determine the constants in the Hall-Petch equation: The strength of mild steel at grain size d1 = 17.43 pm is 1 = 232.9 MPa. Mild steel has a strength of 2 = 874.2 MPa when the grain size is d2 = 0.80 um (or 800 nm). This is the formula for the Hall-Petch equation: = o + Kd(-1/2). We can use the following equation to determine K: K = (σ2 - σ1)(d2^(1/2) - d1^(1/2))^(-1) (-1) When the values are plugged in, we get the following result: K = (874.2 - 232.9)(800(1/2) - 17.43(1/2))(-1) = 276.3 MPa um(1/2) We can use the following equation to determine o: σo = σ1 - Kd1^(-1/2) Plugging in the numbers yields the following result: o = 232.9 - 276.3(17.43(-1/2)) = 62.28 MPa. The Hall-Petch equation's constants are K = 276.3 MPa um(1/2) and o = 62.28 MPa. Hence, the power of the  yield strength of mild steel at 0.160 pm grain size is 1851 MPa.

Learn more about mild steel here:

https://brainly.com/question/30036139

#SPJ4

Taking into account the Scientific notation, 2.36×10⁻²÷ 8.4×10² results 2.8×10⁻⁵.

The scientific notation is a quick way to represent a number using powers of base 10. This notation is used to be able to express very large or very small numbers very easily.

The numbers are written as a product:

a×10ⁿ

where:

To divide numbers in scientific notation, you must first divide the numbers that are not powers of 10, that is, the numbers a. And then you divide the powers of ten by subtracting the exponents.

In this case, you have to divide 2.36×10⁻²÷ 8.4×10².

So, first of all, dividing 2.36 and 8.4 you get:

2.36÷ 8.4= 0.28

And subtracting the powers of both scientific numbers we get:

(-2) - (2)= -4

So, the scientific number obtained is:

0.28×10⁻⁴

Now convert 0.28 to scientific notation by moving the decimal point one place to the right and multiplying by 10⁻¹, which groups to the power of 10⁻⁴ using the Associative Property of Multiplication. This is:

2.8×10⁻¹×10⁻⁴

To multiply the powers of 10 you must add the exponents:

2.8×10⁻¹⁺⁽⁻⁴⁾=  2.8×10⁻¹⁻⁴= 2.8×10⁻⁵

Finally, 2.36×10⁻²÷ 8.4×10² results 2.8×10⁻⁵.

Learn more about scientific notation:
https://brainly.com/question/4353892

Answer:

First Question: in order to better explain what is happening during a phenomenon

Second Question: show beginning, middle and end if it fits the phenomenon; use zoom in bubbles to show the unobservable

Third Question: the type of material used to create the model

Explanation:

First Question: You would not revise a model to "cover up evidence," that's scientifically immoral and should not be done, and showing off to other scientists is not the point of revising something.

Second Question: You should use more than one color to differentiate different parts of the model, but don't overwhelm it with color. There should be some labels in the model, so some writing is necessary.

Third Question: Inaccurate color representation does not technically limit a model unless color scheme is important, so this could be an answer, but not likely. A messy model limits a model because it makes it hard to read. Approximating shapes is a limitation because it portrays an incorrect representation of what system the model is of. The type of material used to create the model is most likely the right answer.

Answer: Photosynthesis

Explanation:

The process of photosynthesis is used to help make food for plants. The inputs are sunlight, water (H2O), and carbon dioxide (CO2). Then the outputs are glucose (C6H12O6) which is food, and oxygen (O2) is released.

I hope this helps :)

Answer:anode

Explanation:This oxide is called rust. This rust flakes off from the surface of iron to expose the fresh metal surface for oxidation. In corrosion, iron metal acts as an anode in a galvanic cell.

Answer: 15.7 liters

Explanation: reaction is 2H2 + O2. -> 2H2O

Because all substance still are gases, volumes in

STP conditions are proportional to amount of moles.

Amount of water is same as Hydrogen. Also volume is same.

Answer:

water energy yes y *jjjjjjjjjj

Answer:

steam particles

Explanation:

If we sum the molar masses of the elements, we find that the molar mass of the compound C₅₅H₇₂N₄O₅ is 869.31 g/mol.

The molar mass is the mass in grams of 1 mole of a substance.

To calculate the molar mass of a compound, we need to sum the molar masses of the elements that form it, which can be found in the periodic table.

M(C₅₅H₇₂N₄O₅) = 55 M(C) + 72 M(H) + 4 M(N) + 5 (O)

M(C₅₅H₇₂N₄O₅) = 55 (12.01 g/mol) + 72 (1.01 g/mol) + 4 (14.01 g/mol) + 5 (16.00 g/mol) = 869.31 g/mol

There is a mistake in the question. The original question is:

C₅₅H₇₂N₄O₅, what is the molar mass?

Learn more about molar mass here: https://brainly.com/question/21334167

#SPJ1

Answer:

h

Explanation:

Image 1

1) There is more proton repulsion in Uranium than in Barium

2) Barium experiences a stronger force holding the nucleons together

3) The repulsion of the neutrons in Uranium makes the nuclide unstable

4) The higher the atomic number, the more likely that the nucleus is radioactive.

5) U-238 has 146 neutrons

6) U - 235 has 143 neutrons

Image 2;

1) You can minimize background radiation by limiting your outdoor exposure.

2) Cosmic radiation is the most difficult to avoid.

The natural radiation that is constantly present in the environment is known as background radiation.

It includes internal radiation found in all living things as well as cosmic radiation, which originates from the sun and stars and terrestrial radiation, which originates from the Earth.

We know that the repulsion of the protons in the Uranium nucleus is more than that of the barium nucleus because there are more neutrons in the Uranium nucleus. It is this repulsion that makes Uranium unstable.

Learn more about background radiation:https://brainly.com/question/30416668

#SPJ1

Answer:

Scandium

Explanation:

scandium is 3 across and 4 down in the periodic table, starting from the left.

The claim that the supplement helps a person lose weight, helps curb appetite to snack less, raises levels of serotonin to make a person feel less hungry, blocks new fat from forming, and increases metabolism to have more energy and burn existing fat, were not proven to be correct in this study.

The data that led me  to that conclusion is:

All the claims made by the product, except reducing visceral fat, were not proven to be correct in this study.

The type of testing data would you need to see in support of those claims to believe they were true is:

When you see a product advertised on social media, you should be skeptical of the claims made by the product, especially if it seems too good to be true. Look for products that have been studied and the data is readily available, avoid products that make claims that seem too good to be true, and be wary of products that are marketed as "miracle cures" or that are marketed as cures for serious diseases or illnesses. Additionally, you can check if the product has been approved by the FDA and if it has any certifications or awards from reputable organizations.

Learn more about Data testing from

https://brainly.com/question/17399396

#SPJ1

Answer:

3.48 x 1013 N2 molecules

step-by-step explanation:

Lets set up our equation first

P = 1.00 x 10-6 mm Hg T = 0.0° C + 273 = 273 K

We are given the V = 985 mL ,

R = 0.0821 L·atm/mol·K

Now use the ldeal gas law, but we are solving n, amount of substanvce

PV = nRT, we will change this equation to ;

n = PV/RT

n = 1.00 x 10-6 mm x 1 atm/760 mm x 985 mL x 1 L/103

mL/

(0.0821 L·atm/mol·K x 273 K) = 5.78 x 10-11 moles N2

nmolecules = 5.78 x 10-11 moles N2 x 6.02 x 1023 N2 molecules/1 mol N2

The ground state electronic configuration for silicon is 1s² 2s² 2p⁶ 3s² 3p².

The electronic configuration is given to each and every element of the periodic table and with the help of this configuration by counting the number of electrons in the series we can predict the position of the element in the periodic table in ground state.

Every element of periodic table have his own electronic configuration

but for exited state it can change on the basis of removal of electrons.

Therefore, the electronic configuration of silicon at ground state will be 1s² 2s² 2p⁶ 3s² 3p².

Learn more about electronic  , here:

https://brainly.com/question/5624100

#SPJ1

Solution :

Let, intensity at distance 3 m from the acoustic source is \(I_o\).

We need to find the distance d where the intensity is \(\dfrac{I_o}{2}\).

Now, we know intensity is inversely proportional to square of distance between the source.

\(\dfrac{I_o}{\dfrac{I_o}{2}} = \dfrac{d^2}{3^2}\\\\d^2 = 18 \\\\d = 3\sqrt{2}\ m\)

Therefore, intensity will be halved at a distance of \(3\sqrt{2}\ m\).