What is the oxidation state of an individual nitrogen atom in nh4oh ? express the oxidation state numerically (e.g., +1)?

Explanation:

When iron reacts with the moisture present in air then an oxide layer tends to develop on the surface of iron. This process is known as rusting of iron.

Chemical formula of rust is [tex]Fe_{2}O_{3}.xH_{2}O[/tex]. This layer of oxide on the surface of iron is orange-brown in color.

This change is a chemical change as a new compound iron oxide has formed in this process of rusting.

Hence, this orange-brown color on the surface of iron helps us to know that rusting has taken place.

The balanced chemical equation has been [tex]\rm 3\;CaCO_3\;\rightarrow\;3\;CaO\;+\;3\;CO_2[/tex].

The balanced equation can be given to follow the law of conservation of mass. with equal  number of atoms of each elements has been present on the product and the reactant side.

The given equation has been written with addition of 3 as a coefficient to the carbon dioxide has been:

[tex]\rm CaCO_3\;\rightarrow\;CaO\;+\;3\;CO_2[/tex]

The number of elements of oxygen on product side has been 6 atoms for carbon dioxide and 1 oxygen atom for calcium oxide. The total oxygen on product side has been 7. The reactant has the presence of 3 oxygen atoms.

The reaction has been balanced with equal atoms on both the sides as:

[tex]\rm 3\;CaCO_3\;\rightarrow\;3\;CaO\;+\;3\;CO_2[/tex]

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Answer:

V = 2.28 L

Explanation:

What volume of pocl3 gas can be produced in theory when 194 g of pcl3 gas reacts with excess oxygen? at STP

1. Determine moles PCl3.

The reaction

2PCl3+O2--------->PClO3

mole =mass/molecular mass

194 grams/137.3334 grams/mole  =

0.102 moles PCl3

2. Get the moles of POCl3 produced from 0.102 moles PCl3.

from the reaction above

2 moles PCl3 produce 2 moles POCl3

PClO3=0.102mole

3. Find the  volume PClO3 using ideal-gas equation: PV = nRT

where:

P = pressure = 1 atm (standard pressure)

V = volume ?

n = moles PClO3 = 0.102 moles PClO3

R = gas constant = 0.08206 L*atm/mol*K

T = temperature = 273.15 K (standard temperature)

(1 atm)*V = (0.102 moles)*(0.08206 L*atm/mol*K)*(273.15 K)

V = 2.28 L

Answer : The molar mass of a gas is, 48.3 g/mole

Solution : Given,

Molar mass of argon gas = 40 g/mole

According to the Graham's law, the rate of effusion of gas is inversely proportional to the square root of the molar mass of gas.

[tex]R\propto \sqrt{\frac{1}{M}}[/tex]

or,

[tex]\frac{R_1}{R_2}=\sqrt{\frac{M_2}{M_1}}[/tex]

where,

[tex]R_1[/tex] = rate of effusion of a gas

[tex]R_2[/tex] = rate of effusion of argon gas

[tex]M_1[/tex] = molar mass of a gas

[tex]M_2[/tex] = molar mass of argon gas

As per question,

[tex]R_1=0.91\times R_2[/tex]

Now put all the given values in the above formula, we get the molar mass of a gas.

[tex]\frac{0.91\times R_2}{R_2}=\sqrt{\frac{40g/mole}{M_1}}[/tex]

[tex]M_1=48.30g/mole[/tex]

Therefore, the molar mass of a gas is, 48.3 g/mole

Answer:

Hemlock poison is your answer

Answer:

2.84 mol

Explanation:

In order to practice sustainable agriculture, less external energy must be used, and renewable energy sources must take their place. To feed a growing world without damaging the ecosystem is the goal of sustainable agriculture. The correct option is C.

Crop rotation, the process of rotating various crops in the same area, helps maintain the soil's health and productivity by creating a mix of nutrients. This may lessen the need for pesticides and fertilizers to kill weeds and insects.

Agriculture that is sustainable generates a lot of food without consuming too many resources or harming the environment. Agriculture develops self-sustaining agricultural and livestock-raising systems that are, like nature, based on natural principles.

Thus the correct option is C.

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Answer;

Ge and As.

Explanation;

Elements Ge and As belong in the same period as krypton.

Each row of the periodic table is called the period.

Elements in each period have the same number of electron shells.

These elements in the same period do not have similar properties- the properties change greatly across every period. Krypton is in period four therefore all the elements in period 4 have four electrons shells.

The correct answer is B. The carrying capacity will decrease and the owl population will decrease.

Explanation:

In ecology, the carrying capacity refers to the number of organisms an ecosystem or area can sustain because it provides water, shelter, food, etc. This carrying capacity decreases due to the destruction of habitat or natural disasters that reduces the resources or habitable area.

This implies, in the case presented, the carrying capacity of the forest will decrease because the resources on in for owls are reduced to half due to housing development. Besides this, it is expected the owl population decreases because with less food, water, and other resources such as trees to nest ess owls will survive and reproduce. Thus, in this case, "the carrying capacity will decrease and the owl population will decrease".

Final answer:

The hydrogen ion concentration [H+] changes by a factor of 10 for each unit change in pH. Therefore, a pH change of 3.20 units results in a 10^3.20 (approximately 1,585-fold) change in [H+].

Explanation:

The pH scale is a logarithmic scale used to measure the acidity or basicity of an aqueous solution. The pH value is calculated by taking the negative logarithm of the hydrogen ion concentration ([H+]). For each unit change in pH, the hydrogen ion concentration changes by a factor of 10.

When considering a pH change of 3.20 units, you calculate the change in hydrogen ion concentration by raising 10 to the power of the pH change. Therefore, for each pH change of 1 unit, the [H+] changes by a factor of 10. Hence, for a change of 3.20 units:

For each pH change of 3.20 units, the [H⁺] concentration changes by a factor of approximately 1584.89.

A change of one unit on the pH scale represents a change in the [H⁺] concentration by a factor of 10. Consequently, a change of two units represents a change in the [H⁺] concentration by a factor of 100. For a change of 3.20 units, the factor is 103.20.

Calculating this, we get:

103.20 = 1584.89

Therefore, the [H⁺] concentration changes by a factor of approximately 1584.89 for a pH change of 3.20 units.

the answer is: in such conditions, oxygen was available in abundance.

The equilibrium concentration of cl2 at 227C is mathematically given as

[Cl2] = 2.4X10^-4 m

Question Parameters:

If a reaction mixture initially contains 0.195 m so2cl2

concentration of cl2 at 227

Generally the equation for the Chemical Reaction  is mathematically given as

SOCl2 ⇄ SO2 +Cl2

Therefore

[tex]K=\frac{ [SO2][Cl2]}{SOCl2}[/tex]

2.99X10^-7 = (X)(X)/(0.195-X)

X = 0.00024 = 2.4 X10^-4

[Cl2] = 2.4X10^-4 m

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The mass of a substance can be determined from the density and volume of the substance. The mass of gasoline with 0.65 g/ml density and 45 L volume is 29.25 Kg.

Density of a substance is the measure of its mass per volume. Thus it is the ratio of its mass to the volume. Density of a substance depends on the temperature, pressure, bond type etc other than mas and volume.

Mass of the substance is the total amount of the substance expressed in g, kg or mg. The mass multiplied by the gravity experienced by the body is called its weight.

Volume of a substance is the total space occupied by the substance. Volume is expressed in cm³, Liter, milliliter etc.

Here the density of the substances is given 0.65 g/ml and volume is 45 liter or 45000 ml. Mass can be calculated by multiplying density with volume.

Mass = density × volume.

         =  0.65 g/ml ×  45000 ml

         = 29250 g

         = 29.25 g.

Hence, mass of the substance is 29.25 g.

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Answer:

39.98 liters

Explanation:

The first you should know:  At STP , 1 mole of any  gas takes up 22.4 Liters of volume.

After, you will find the molecular weight (MW) of N2 with help of a periodic table.

Then N= 14,007 g      

So:  

N2 = 14,007 * 2      

MW =28,014 g/ mol N2  

Now you will start with the data of 50 grams of N2 and you obtain:    

50 g N2  x 1 mol N2    x  22.4 L N2      =  39.98 L at STP                                 28,014 g N2        1 mol N2      

50 g of nitrogen, N₂ has a volume of 40 L at standard temperature and pressure (stp)

We'll begin by calculating the number of mole in 50 g of N₂. This can be obtained as follow:

Mass of N₂ = 50 g

Molar mass of N₂ = 2 × 14 = 28 g/mol

Mole = mass / molar mass

Mole of N₂ = 50 / 28

Finally, we shall obtain the volume occupied by 1.786 mole of N₂ at STP. This can be obtained as follow:

At standard temperature and pressure (STP)

1 mole of N₂ = 22.4 L

Therefore,

1.786 mole of N₂ = 1.786 × 22.4

1.786 mole of N₂ = 40 L

Therefore, 50 g of N₂ occupies 40 L at standard temperature and pressure (STP).

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Answer:

CaCl2

Explanation:

Calcium: Ca

Chloride or chlorine: Cl

Chloride: it is name of chlorine when it has a ion

calcium has a charge of +2 and  Chlorine has a charge of -1

this is a ionic bond, so the charges of the two atoms have to equal or cancel out, so u need two  Chlorine

and then it will be calcium +2 and chloride -2

2-2=0, they are neutral and we are right

CaCl2

its actually answer 2

Answer : Option B) Air

Explanation : As the speed of light depends on the refractive index of the medium; then according to Snell's law (refer the attachment) Air is the medium that would have the longest wavelength amongst the given options.

As the refractive indexes of water is 1.33, glass is 1.5 and diamond 2.42 are much higher than air. Therefore, it will be the medium which will allow maximum light to pass through it easily and hence, will be the medium with longest wavelength.

The correct answer is air.  

The refractive indexes of air, water, glass and diamond are1.0003, 1.33, 1.5 and 2.42 respectively. The refractive index of air is the lowest so it is the medium through which light will travel faster with the longest wavelength. The higher the refractive index the denser the medium and the slower is the speed with which light will travel through this medium.  

a) The rate of particle movement decreases as temperature decreases, causing the atoms and molecules in the liquid to move less energetically.

The atoms and molecules in a liquid are in constant motion. As temperature decreases, the kinetic energy of these particles decreases as well.

This is because temperature is directly related to the average kinetic energy of the particles in a substance. Therefore, as the temperature drops, the particles move more slowly.

Here's a step-by-step explanation:

The decrease in the temperature of a liquid leads to a reduction in the thermal energy provided to the particles.

Kinetic energy, the energy of motion, is directly proportional to temperature, which measures the average kinetic energy of particles, indicating a decrease in temperature.

Particles' movement decreases with less kinetic energy, resulting in slower and slower particles.

The distance between particles may decrease due to stronger attractive forces at lower kinetic energies, but option b (distance increases) is incorrect as particles come closer together as they lose energy.

The attraction between particles decreases with decreased kinetic energy, causing them to pull closer together, contradicting option c.

Particles' potential energy decreases as they move closer in a stable configuration at lower temperatures.

Correct Question:

The atoms and molecules in a liquid are in constant motion. As temperature decreases, what is true of the particles in the liquid?  

a) the rate of particle movement decreases  

b) the distance between the particles increases  

c) the attraction between the particles decreases  

d) the potential energy of the particles increases