4 Fe(s) + 3 O2(g) → 2 Fe2O3(s) How many grams of oxygen gas, O2(g), are needed to react completely with 17.86 grams of iron?

The molecular geometry of CF4 is tetrahedral because it has all fluorine atoms in the surrounding.

Answer:

P2S5

Explanation:

This answer is pretty much asking for two numbers that are mutually prime and have a ratio of 0.25 to 0.625
0.25 = 1/4
0.625 = 5/8

the ratio of 0.25 to 0.625 would thus equal 1/4:5/8 which is 0.4
So, two numbers that are mutually prime and divide to 0.4
Set up the equation:
x/y = 0.4 where x is the moles of red phosphorus and y is the moles of sulfur.
With some trial and error, it's easy to find out that 2 and 5 are the solutions.
Since x = 2 and y = 5, the subscripts for the PxSy compounds are found.
P2S5 would be the empirical formula

Anything around us that can be physically seen and touched are matter. Matter can be solid, liquid or gas. To solve this question we need to know the all properties of liquid so option D is correct option.

Matter is a substance that has some mass and can occupy some volume. Matter that is given is liquid which has property that it occupies the volume of container in which it is kept.

There is a law called conservation of mass, mass can never be destroyed. To change and color of liquid  we need to heat up the liquid and that we are not doing over here.

Thus option D is correct option.

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Boiling point of Alcl3 would be highest .

As, i of Na2S= 3

2) i of NaNO3= 2

3) i of Alcl3= 4

4) i of Sucrose= 1 (As it doesn't show any kind of dissociation)

5) i of Mg(clo4)2= 3

Although we're assuming water as the solvent, boiling point elevation also depends on the solute concentration and the number of particles the solute breaks down into. The total number of particles in solution affects aggregative qualities like boiling point elevation. Here, water is the solvent. As a result, the boiling point of all solutions will be elevated above the boiling point of water.

Boiling point  van't hoff factor.

The Van't Hoff factor is the ratio of a substance's mass concentration to the concentration of the particles it dissolves into. How much a substance associates or dissociates in a solution is determined by the Van't Hoff factor.

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When lithium chloride, LiCl, dissolves in water, it forms lithium ions, [tex]Li^{+}[/tex], in aqueous solution with water, [tex]H_{2}O[/tex].

Water has a higher solubility for lithium chloride than non-polar solvents. The LiCl crystal is destroyed as a result of the interactions between the ions and the polar water molecules, and the hydrogen bonding structure of the H2O molecules in the liquid water is also disrupted, allowing the ions to be incorporated among the water molecules.

The ions in the crystal lattice would not be attracted to non-polar molecules very strongly. LiCl would continue to be in the crystal structure while the non-polar molecules would continue to be attracted to one another by the weak London force.

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The equation of line u, given that it is parallel to line t is:

y = –17x – 113

We know that the equation of straight line is given as

y = mx + c

Where

First, we shall determine the slope of line u. This can be obtained as follow:

y = –17x – 2

Comparing y = mx + c with y = –17x – 2,

The slope (m₁) = –17

Recall,

The slope of parallel lines are equal.

Thus,

The slope of line u, is given as:

m₂ = m₁ = –17

Finally, we shall obtain the equation of line u as follow:

y – y₁ = m₂(x – x₁)

y – 6 = –17(x – 7)

Clear bracket

y – 6 = –17x – 119

Rearrange

y = –17x – 119 + 6

y = –17x – 113

Thus, the equation of line u is y = –17x – 113

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Answer:

Equation of line is given as y = mx + c, where m is the gradient and c is the y-intercept.

Parallel lines have the same gradient so gradient of line u is -17.

Equation of line u is y = -17x + c

Substitute (7,6) into the equation to find c.

6 = -17(7) + c

c = 125

Hence, equation of line u is y = -17x + 125.

The formula should be MNO₃ because the valency of the metal and the nitrate ion both is 1 and thus the formula will be MN0₃.

Cold water causes a strong reaction between all alkali metals. Each time a reaction occurs, hydrogen gas is released along with the metal hydroxide. As you move down the group, the reaction gets faster and more violent. This demonstrates that as you move below Group 1, the alkali metals' reactivity rises.

Chlorides are created when any of the group 1 metals interact with chlorine. At room temperature, the chlorides are all white solids that dissolve to create a neutral solution. As you move down the group, the reactions get more forceful.

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Answer:

State Function: A system will be said to have a state function when its properties are independent of the path followed to carry out the state and it is fixated on a particular state.

Examples of state function are Pressure, Temperature, Mass, Volume & all the thermodynamics quantity (H, G, A, U, S).

A quantity which depends on the path followed is known as a path function. In thermodynamics, there are only two path functions: work and heat.

Exact differential: The differential of a state function for an infinitesimally small change in its property is called an exact differential.

Mathematically say phi is a function of x and y,

[tex] \phi \: = f(x, y)[/tex]

The overall change in phi i.e. dΦ will be,

[tex]d \phi \: = ( \frac{∂ \phi}{∂x})_ydx + ( \frac{∂ \phi}{∂y})_xdy[/tex]

let,

[tex]( \frac{ ∂\phi}{∂x})_y = m,( \frac{∂ \phi}{∂y})_x = n[/tex]

if Φ is a state function of x and y then,

[tex]( \frac{ ∂m}{∂y})_x =( \frac{ ∂n}{∂x})_y[/tex]

Cross reciprocality theorem.

substituting the value of m & n,

[tex][\frac{ ∂}{∂y}( \frac{ ∂\phi}{∂x})_y]_x =[ \frac{ ∂}{∂x}( \frac{ ∂\phi}{∂y})_x]_y[/tex]

Simplifying,

[tex] \frac{ {∂}^{2} \phi }{∂y \cdot ∂x} = \frac{ {∂}^{2} \phi }{∂x \cdot ∂y}[/tex]

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Explanation:

For this question, we need to know that:

Magnesium is Mg

Silver Nitrate is AgNO3

So the complete and balanced reaction is:

Mg + 2 AgNO3 → Mg(NO3)2 + 2 Ag

Also, we need to know that is it a single replacement equation.

Single replacement reactions are those that occur between a compound substance (made up of more than one chemical element) and a simple substance (made up of only one type of chemical element), giving rise to another simple substance and another compound.

Generically, we have:

A + CD → AC + D

This is the case of this reaction.

Answer:

Determine the reaction type

Single replacement.

Finish the word equation

Magnesium + Silver Nitrate → Magnesium nitrate + silver

Write a balanced chemical reaction

Mg + 2 AgNO3 → Mg(NO3)2 + 2 Ag

For single replacement state the transfer of electrons

Electrons are transferred from magnesium to silver.

Answer

The density of the oil in kilograms per liter is 0.78775

Explanation

Note: 1 gallon = 3.78541 liters

1 pound = 0.453592 kilogram

Given:

The gallons (volume) of crude oil = 3.24 x 10⁷ gallons

The mass of the crude oil = 2.13 x 10⁸ pounds

Conversion:

The volume in liters of 3.24 x 10⁷ gallons of crude oil will be

Also, the mass in kilograms of 2.13 x 10⁸ pounds of crude oil will be

Now, we shall use the formula below to calculate the density

Calcium carbonate deposits in heating elements can be eliminated by way of cleansing these with an acid (like vinegar or lemon juice). This acid will react with the calcium carbonate to provide salt, water, and carbon dioxide gas.

Calcium carbonate is a nutritional supplement used whilst the amount of calcium taken in the weight loss plan is not enough. Calcium is needed via the frame for healthful bones, muscle groups, anxious devices, and the heart. Calcium carbonate also is used as an antacid to relieve heartburn, acid indigestion, and a disillusioned stomach.

Calcium carbonate is the salt of a sturdy base (due to the presence of the calcium ion) and a vulnerable acid (because of the presence of the carbonate ion, generally derived from carbonic acid). consequently, this salt is mildly basic in nature.

Calcium carbonate reacts with water that is saturated with carbon dioxide to shape the soluble calcium bicarbonate. This response is essential in the erosion of carbonate rock, forming caverns, and results in difficult water in lots of regions.

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The total pressure would be 1189 atm.

What is pressure?

pressure is the force applied perpendicular to the surface of an object per unit area over which that force is distributed .

Sol-the reaction is -

4C3H5(NO3)3--->6N2+O2+12CO2+10H2O

As we have the volume of TNT .we must know the density to find out the mass and then, apply molar mass to calculate mole.

TNT density = 1.654 g/mL

Density = mass / volume

1.654 g/mL = TNT mass / 50mL

1.654 g/mL . 50mL = TNT mass → 82.7 g

Mass / Molar mass = Mol → 82.7 g / 227.1 g/m = 0.364 mole

Now, we can calculate all the mole for the formed gases.

4 mole of TNT produce 6 mole N₂ ___ 1 mol O₂ __ 12 mole dioxide __ 10 mole of water

0.364 mole of TNT will produce:

- (0.364  . 6) /4 = 0.546 mole of produced nitrogen

- (0.364 . 1) /4 =  0.091 mole of produced oxygen

- (0.364 . 12) /4 = 1.092 mole of produced dioxide

0.364 . 10) /4 = 0.91 mole of produced vapour of water.

Total mole = 0.564 + 0.091 + 1.092 + 0.91 = 2.657 mole

Let's apply the Ideal Gases Law to find the total pressure, at STP

In STP, pressure is 1 atm for 1 mole at 273K, in a volume of 22.4 mL

But we have a volume of 50mL, and we have 2.657 total mole

Don't forget to convert 50 mL to L, cause the units for R

50 mL = 0.050L

P . 0.050L = 2.657 mol . 0.082L.atm/mol.K . 273K

P = (2.657 mol . 0.082L.atm/mol.K . 273K) / 0.050L

Thus

P=1189 atm

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Answer:

Rights

Explanation:

Every human has their rights such as those stated. These rights are what is protected by law.

Answer:

I believe the answers are "granulosa cells" and "zona pellucida"

In sexual reproduction in humans, the sperm  penetrate the oocyte using acrosomal enzymes. It must penetrate both the granulosa cells and zona pellucida.

Sexual reproduction is a type of reproduction where the offsprings are produced by the combination of genetic material of two individuals which are of different sexes.

It is the dominant form of reproduction in living beings. Here, the genetic information is stored in chromosomes which are present in the nucleus of reproductive cells which are called gametes.Gametes fuse to form a diploid zygote.Zygote then develops into a new living being.

Because of sexual reproduction variations in living beings are possible because of reshuffling of genetic material. Here, haploid gametes form diploid zygotes except in case of bacteria.

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To see the total number of atoms of an element we need to multiply stoichiometry of that element to the number that is written on the foot of that element. Thus the balanced equation is

NaNO₂(aq)+AgNO₃(s)→NaNO₃(aq)+AgNO₂(s)

Balanced equation is the one in which the total number of atoms of a species on reactant side is equal to the total number of atoms on product side

The unbalanced equation is

NaNO₂(aq)+AgNO₃(s)→NaNO₃(aq)+AgNO₂(s)

Sodium atoms on reactant and product side is 1

Silver atoms on reactant and product side is 1

Nitrogen atoms on reactant side and product side is 2

Oxygen atom on reactant side and product side is 5

Thus the balanced reaction is

NaNO₂(aq)+AgNO₃(s)→NaNO₃(aq)+AgNO₂(s)

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Answer:

Explanation:

Here, we want to get the number of regular strength pills of ibuprofen

To get this,we firstly need to get the number of moles

We can get this by dividing this value by the number of molecules in 1 mole which is:

Mathematically, we have this as:

From earlier calcuations, 1 pill of regular strength ibuprofen contains 0.000963 moles

The number of pills that will contain overall 0.00291 moles will be:

Answer:

The cup of hot chocolate.

Explanation:

Thermal energy is measured based on the amount of kinetic energy in an object. Thus, concluding that the cup of hot chocolate contains more kinetic energy than the cup of cold chocolate milk.

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Prior to and following the summer solstice, the sun angle is high and there are the most daylight minutes. The amount of daylight gets less as the sun starts to descend in the sky.

The North Pole is tilted farther toward the sun on the June solstice than any other day of the year. As a result, the Northern Hemisphere will have its longest day and shortest night on June 21.

According to the Gregorian calendar, the June solstice is the solstice on Earth and takes place every year between June 20 and June 22. The June solstice is the summer solstice in the Northern Hemisphere and the winter solstice in the Southern Hemisphere. The northern solstice is another name for it.

Midsummer, also known as the summer solstice, is the time of year when a planet's rotational axis, or geographic pole, in either its northern or southern hemisphere, is most inclined toward the star it orbits. The Earth's maximum axial tilt toward the Sun is 23.44° on the summer solstice.

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The percent abundance of the second isotope of lithium that has a mass of 7.016004 and abundance of 92.41% is 6.465.

Isotopes are any of two or more forms of an element where the atoms have the same number of protons, but a different number of neutrons within their nuclei.

Thus, isotopes have the same atomic number but a different mass number.

The relative abundance of the isotope of an element is the percentage of atoms with a specific atomic mass found in a naturally occurring sample of an element.

According to this question, an isotope of lithium has a relative abundance of 92.41%. This means that the percentage abundance is calculated as follows:

92.41% × 7.016004 = 6.465amu

Therefore, 6.465 is the percentage abundance of the lithium isotope.

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Answer

n = 2, l = 0, ml = +2, ms = -1/2

n = 3, l = 1, ml = +1, ms = +1/2

Explanation

In atoms, there are a total of four quantum numbers namely;

The principal quantum number (n), n = 1, 2, 3, ....

The orbital angular momentum quantum number (l), for n = 3, l = (n - 1) = 0, 1, 2, The magnetic quantum number (ml), for l = 2, ml = (-l, 0, +l) = -2, -1, 0, +1, +2, and The electron spin quantum number (ms), ms = -1/2, +1/2

Therefore, the following sets of quantum numbers contains an error among the given sets:

n = 2, l = 0, ml = +2, ms = -1/2

n = 3, l = 1, ml = +1, ms = +1/2

The kilocalories of the 170KJ energy value = 40.6 kcal

Carbohydrate is defined as the major class of nutrients in food and food products that are organic macromolecule which are capable of giving body energy when broken down to its smallest unit called glucose.

The functions of carbohydrates in the body include the following:

For every 10 g of carbohydrates that is being consumed, 170 kilojoules of energy is obtained.

To convert 170 kilojoules to kilocalories;

1 kilocalorie = 4.184 kilojoules

X kcal = 170 kJ

make X kcal the subject of formula,

X kcal = 170/4.184

X kcal = 40.6 kilo calories.

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Carbocation intermediate in an electrophilic addition reaction of HCl with two different alkenes and the structural formulas for both of the alkenes are 1,3 dimethyl butene

Carbocation is the molecule in which the carbon has the positive charge and three bond and it is an organic molecule, an intermediate, that forms as a result of the loss of two valence electrons, normally shared electrons, from a carbon atom that already has four bonds

Here given diagram is attached and is a carbocation intermediate in an electrophilic addition reaction of HCl with two different alkene and then two alkenes are form which is 1,3 dimethyl butene and given below the structure formula for 1,3 dimethyl butene

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The 107 moles of electrons are needed to produce 53.5 mol of solid zinc.

The electron is a subatomic particle that contains a negative elementary charge. The electron's mass is approximate 1/1836th that of the proton and has an intrinsic angular momentum of a half-integer value. No two electrons can have the same quantum state.

An electron is bounded to the nucleus of an atom by the attractive Coulomb force. If the number of electrons differs from the nucleus's electrical charge is known as an ion. Each orbital has a unique set of quantum numbers that exist around the nucleus of an atom.

Solid zinc can be formed by chemical reactions:

Zn²⁺  +  2e⁻   →  Zn (s)

One mole of zinc is produced when two moles of electrons are accepted by one mole of zinc ions

One mole of solid zinc is produced from electrons = 2 moles

The 53.5 mol of zinc will be produced from electrons = 2 × 53.5 = 107 mol

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Using the Linus Pauling electronic configuration rules, we can see that the total number of possible electrons in the orbital 3d is:

1s2 2s2 2p6 3s2 3p6 4s2 3d10, therefore the maximum amount if 10 electrons according to the rules of electronic configuration

Answer:

NO2 has sp2 hybridization in the traditional sense.

Explanation:

Single electron orbitals are often pure, unhybridized p-orbitals, such those seen in the methyl free radical.

However, when the central atom is joined to strongly electronegative atoms or groups, the single electron orbital is said to be hybridized. It happens as a result of the core atom's decreasing electron density, which draws in odd electron orbital density and reduces the size of the odd electron orbital. As a result, the odd-electron orbital takes on some "s" character and becomes hybridized.

ClO2, ClO3, and CF3 are sp3 hybridized for the same reason.

The pH of the solution can be obtained as 13.13.

The pH is the negative logarithm of thee concentration of the hydrogen ions that is present in the solution.

The Number of moles of sodium hydroxide = 20.7/1000 L * 0.10 M

= 2.07 * 10^-3 moles

Number of moles of acetic acid = 60.5/1000 * 0.21 M

= 1.27 * 10^-2 moles

Since the reaction is 1:1. the sodium hydroxide is in excess.

Number of moles of excess hydroxide = 1.27 * 10^-2 moles - 2.07 * 10^-3 moles = 0.011 moles

Total volume = 20.7 mL + 60.5 mL = 81.2 mL or 0.0812 L

Concentration of excess hydroxide ions = 0.011 moles/0.0812 L

= 0.135 M

pOH = -log(0.135 M)

= 0.87

pH = 14 - 0.87

= 13.13

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Solution A and B are BASIC

Using the formula below to determine the concentration of the hydroxonium ion;

Determine the pH

This shows that the solution A is BASIC since the pH is greater than 7

For solution B

Determine the pH

This shows that the solution B is BASIC since the pH is greater than 7

For the solution C

Determine the pH of the solution C

Since the pH of the soution C is less than 7, hence the solution C is ACIDIC

The pH of a 0.49 M solution of hydrocyanic acid is 0.31.

pH is a figure expressing the acidity or alkalinity of a solution on a logarithmic scale on which 7 is neutral, lower values are more acid and higher values more alkaline.

The pH of a solution can be calculated using the following equation or expression:

pH = - log {H⁺}

According to this question, a 0.49 M solution of hydrocyanic acid. The pH can be calculated as follows:

pH = - log {0.49}

pH = 0.31

Therefore, 0.31 is the pH of the solution.

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The energy released as heat when a typical table sugar cube of mass 1.5 g is burned in air is 24.78 KJ energy.

Energy is defined as the quantitative property that is transferred to a body or physical system and is visible in the performance of work as well as in the form of heat and light.

A. Table sugar is sucrose.

According to the data, its molecular formula is C12H22O11 and its molecular weight is 342 g when 1 mole of sucrose gives 5650 KJ/mole energy on combustion. 1.5 g equals 0.00438 moles of energy is 24.78 KJ.

B. According to Newton's laws, 25% of the above released energy is used for work, which equals 6.19 KJ.

6.19 KJ = 6190 joules

U= mgh

U= ENERGY = WORK

m = mass of the object here mass of a normal adult

g = gravity =9.8 m/s2

h = height in meters

The height that can be climbed based on the above data is = 12.63m.

C. When 1 mole of glucose gives 2805 KJ/mole energy on combustion, its molecular formula  is C6H12O6

Molecular weight is 180 g.

2.5 g equates to 0.0138 moles producing 38.95 kJ of energy.

D. 25% of the previously released energy is used for work, which means

According to Newton's laws, 9.73kJ is used.

9.73 KJ = 9730 joules

U= mgh

U= ENERGY = WORK

m = mass of the object here mass of a normal adult

g = gravity =9.8 m/s2

h = height in meters

Height = 19.85m based on the above data

Thus, the energy released as heat when a typical table sugar cube of mass 1.5 g is burned in air is 24.78 KJ energy.

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Answer:

Below

Explanation:

Br and I: Similar chemical properties

Cl and Se: Nonmetals

Dy and Es: Inner transition metals

Ca-39 and Ca-38: Isotopes

Bronze and pewter: Alloys

Al2+ and S2-: Ions