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Answer:

because Stefan's nose is so warmer than the ground.

ground have a same temperature like air but nose of human have maybe 32°C.

When solid converts to liquid then heat is required to break the intermolecular forces of attraction between the particles. In this process heat increase but temperature remains the same. Snow that falls on Stefan’s nose melts very quickly because Stefan's nose is so warmer than the ground.

Phase transition is a process in which transition takes place from one state to another of a medium on changing temperature or pressure. Phase transition is a physical process as there is no breaking of old bond and forming of new bonds takes place.

During phase transition temperature remain constant as the extra heat that is given to the system that goes into breaking of intermolecular forces of attraction between the particles. So overall temperature remains same but heat keeps on increasing.

Snow that falls on the ground melts slowly. Snow that falls on Stefan’s nose melts very quickly because Stefan's nose is so warmer than the ground. Ground have a same temperature like air but nose of human may have 32°C.

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Answer:

From the mole ratio of the gases, 10 moles of hydrogen will produce 10 moles of water, and if 10.0 L of hydrogen and 6.0 L of oxygen were used, 10.0 L of water will be produced.

What is the mole ratio of reactants in the formation of water?

The mole ratio of the reactants in the formation of water can be shown from the equation below:

Mole ratio of hydrogen to oxygen is 2:1

10 moles of hydrogen will require 5 moles of oxygen, therefore hydrogen is the limiting reactant.

10 moles of hydrogen will produce 10 moles of water.

1 mole of a gas has a volume of 22.4 L.

If 10.0 L of hydrogen and 6.0 L of oxygen were used, 10.0 L of water will be produced.

Therefore, the volume ratio of gas equals mole ratio of gas

Explanation:

Answer: 192g O2

Explanation:

Balanced equation

S + O2 → SO2

1mol O2 produces 1 mol SO2

6mol O2 required to produce 6 mol SO2

Molar mass O2 = 32g/mol

Mass of 6 mol O2 = 6*32 = 192g O2 required.

Answer:

ii.

Explanation:

Regulating weather patterns

Answer:

Air is a mixture, and the image shows that it is composed of different amounts of the same several pure substances.

Explanation:

water, O2, and carbon dioxide (all mixtures) are made of pure substances like hydrogen, oxygen, and carbon.

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Answer:

primary, secondary and tertiary water treatment.

Explanation:

Answer:

The Theory of Evolution

Explanation:

it had many struggles but think of how we grew I agree with the theory of evolution because it has shown that studies of animals were here before humans

Answer:

John Dalton

Explanation:

John Dalton developed the concept tittle: Dalton Law of Partial Pressure.

The formula is: Pt = Pa + Pb + Pc...... Pn

Answer:

Metals

Explanation:

Filling that table

#Solid in liquid

#solid in a gas

#Gas in a liquid

#Solid in a liquid

#Liquid in gas

Answer:

2 M

Explanation:

molarity = (moles of solute)/(liters of solution)

molarity = 10/5 = 2 M

A decomposition reaction is the breakdown of reactants into two or more products. The concentration of dinitrogen pentoxide after 4 minutes will be 1.63 moles.

The first-order rate constant (k) is the order of the reaction that is the initial rate and is given as 1/s.

The first order is shown as:

[tex]\rm [ln] A = \rm ln [A]_{o} - kt[/tex]

Given,

Initial concentration = 0.013 M

k =  [tex]6.82 \times 10^{-3}\;\rm s^{-1}[/tex]

t = 240 seconds

Substituting values above:

[tex]\begin{aligned} \rm [ln] A &= \rm ln[0.013] - 9 6.82\times 10^{-3} \times 240)\\\\[A] &= \rm e^{ln[0.013]} - (6.82 \times 10^{-3} s^{-1} \times 240 s)\\\\& = 1.6238\end{aligned}[/tex]

Therefore, 1.63 moles will remain after 4 minutes.

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Answer:

Option B

Explanation:

The given alkyl chloride having molecular formula ClCH2CHCl2, have IUPAC name 1,1,2 - trichloride ethane which can be represented in structural formula as shown in Option B, where the right carbon atom receives lower integer in numbering i.e. 1 and on the first carbon atom because it have two Chlorine atoms, and second carbon atom is numbered 2, having one Chlorine substituent on it.

Another reason for option A is incorrect answer, because the number of atoms in molecular formula & number of atoms in structural formula ain't same, in molecular formula there is a -CH2- & a -CH- substituent present, but in option A both the carbon atoms are -CH2- bonded to each other with chloride linkage.

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Answer:

Option B

Explanation:

KOH+NaCl⇒NaOH+KCl

there is no net ionic equation because all compounds dissolves

Answer:

Prevent mining wastes from entering water sources and the air

The initial movement of groundwater into the atmosphere to form clouds is due to evaporation caused by solar radiation.

Evaporation is the process by which a liquid spontaneously turns to vapor as a result of temperature increase.

Ground water moves from the ground to the atmosphere when the radiant heat from the Sun turns liquid water to vapor.

Therefore, the initial movement of groundwater into the atmosphere to form clouds is due to evaporation caused by solar radiation.

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[tex]\tt \dfrac{760~mmHg}{1~atm}\times 0.876~atm=665~mmHg[/tex]

Answer:

A peer-reviewed study by university researchers.

Explanation:

The manufacturer of the car might be interested in making the car look more efficient than it is.

The half-reaction includes either the reduction or the oxidation reaction of the redox reactions. In acidic solution permanganate ion will react with hydrogen ion to yield manganese ion and water.

Redox or oxidation-reduction reactions are the chemical reactions in which the oxidation and the reduction of the chemical species occur simultaneously.

Permanganate (VII) ion is a strong oxidizing agent and gets easily reduced to manganese ion in presence of the hydrogen ion in an acidic solution.

The balanced half-reaction for reduction is shown as,

[tex]\rm MnO_{4}^{-} \; (aq)+ 8H^{+} \; (aq)+ 5e^{-} \rightarrow Mn^{2+} \; (aq)+ 4H_{2}O \; (l)[/tex]

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Answer:

Explanation: pls read what i wrote i don't know if it's correct but i just tried to solve it

Answer:

A. Water changes from a solid to a liquid to a gas.

Explanation:

Answer:

The solubility mainly depends on the composition of solute and solvent (including their pH and the presence of other dissolved substances) as well as on temperature and pressure.

Explanation:

If the density of a gas is 1.2g/l at 745 torr and 20 degree C, then the molar mass of gas is 30 g/mole.

Ideal gas equation gives idea about the behavior of gas at different condition & represented as:

PV = nRT, where

On putting all these value in the above equation, we get moles

n = (745)(1) / (62.36)(293) =  0.04 mole

Molar mass will be calculate by using the below equation:

M = W/n, where

M = 1.2 / 0.04 = 30g/mol

Hence required molar mass of gas is 30g/mol.

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The dissolution of borax in water is a temperature dependent reaction. With the higher temperature, the salt dissolve quickly.

Borax is the hydrate salt of boric acid. It is white and widely used in cleaning and in laundry  detergent.

Borax is a salt that will dissolve in water at almost any temperature, with the exception of steam and ice.

However, as with any salt, the higher the temperature, the faster the salt dissolves, so speed is dependent on temperature. It will dissolve in cold water, but it will take longer.

Thus, the dissolution of borax in water is a temperature dependent reaction.

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#1

Moles of Oxygen =3

Molecules:-

#2

Its because according to law of conservation of mass- Mass is neither created nor destroyed

AS ITS BALANCED SO BOTH SIDES ARE SAME .

HENCE THEY OBEY

[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]

As per the given reaction, we can clearly observe that :

#1. How many Oxygen atoms are there in reactant and product side ?

- The number of Oxygen atoms is same as in reactant Side and product side, that is 6 atoms ~

#2. How does the reaction illustrate the law of conservation of mass ?

- According to law of conservation of mass, mass can neither be created nor be destroyed in a chemical reaction. so the mass of each element on reactant Side should be equal to that in the product side.

Now, let's check out if it's true for the given reaction ~

[tex]\qquad \sf  \dashrightarrow \: 4(27) + 3(32) = 2 \{(2 \sdot27) + (3 \sdot16) \}[/tex]

[tex]\qquad \sf  \dashrightarrow \:108 + 96= 2 \{54+ 48\}[/tex]

[tex]\qquad \sf  \dashrightarrow \:204= 2 \{102\}[/tex]

[tex]\qquad \sf  \dashrightarrow \:204= 204[/tex]

Hence, it's verified ~ that it follows law of conservation of mass ~

Answer:

Each atom has electrons, particles that carry electric charges. Spinning like tops, the electrons circle the nucleus, or core, of an atom. Their movement generates an electric current and causes each electron to act like a microscopic magnet

Explanation:

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