The process due to which a solid directly changes into its vapours.
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The balanced half-reaction equation is [tex]MnO_4^- + 4H^+ --- > MnO_2 + 2H_2O + 3e^-[/tex]

The term redox reaction has to do with a reaction in which there is a loss or gain of electrons. In this reaction, one specie accepts electrons while another species loses electrons.

The balanced half-reaction equation in acid is;

[tex]MnO_4^- + 4H^+ --- > MnO_2 + 2H_2O + 3e^-[/tex]

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Answer:

Total partial pressure, Pt = 821 mm Hg

Partial pressure of Helium, P1 = 105 mm Hg

Partial pressure of Nitrogen, P2 = 312 mm Hg

Partial pressure of Oxygen, P3 = ? mm Hg

According to Dalton's law of Partial pressures,

Pt = P1 + P2 + P3

So, P3 = 404 mm Hg

Answer:here:

Explanation:helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and oganesson (Og).

Answer:

absorb heat from the sun

Explanation:

Greenhouse gases are specific type of gases that possess the ability to trap and emit heat/thermal energy in the atmosphere. They are able to do this because of their structure. Examples of greenhouse gases are carbon dioxide (CO2), methane (CH4), chlorofluorocarbon (CFC) etc and are mostly produced via anthropogenic activities.

Greenhouse gases are therefore, produced both artificially (by burning fossil fuels) and naturally and functions to absorb heat from the atmospheric surroundings.

Answer:

balenced.

Explanation:

An ecosystem where all organisms have niches and habitats will be balanced.

An ecosystem consists of all the organisms and the physical environment with which they interact.

Niche describes the role an organism plays in a community. A species' niche encompasses both the physical and environmental conditions it requires and the interactions it has with other species.

Habitat is the area and resources used by a particular species.

A balanced ecosystem represents a sustainable habitat of interdependent animals, plants, and microorganisms and their environment.

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The answer is the specific heat of the gold is 0.129 J/gC .

It is an experimental method that allows one to calculate the heat change in a chemical process.

Calorimeter is just a reaction vessel. It could be a foam cup, a soda can, or a commercially available bomb calorimeter

Where q represents the heat change in the reaction, the calorimeter and the water. Since you are only measuring temperature, you will need to calculate the heat using it.

The change in heat of the gold is given by:

[tex]\rm q_{gold} = m c_{gold}\Delta T[/tex]

[tex]=78 \times c_{p}\times (175-38.18)[/tex]

The change in heat of the water is given by:

[tex]\rm q_{water} = mc_{p}\Delta T[/tex]

m is the mass of water in the calorimeter in grams,

and delta T is the change in temperature.

where [tex]\rm c_{p}[/tex] is the specific heat of water, which is 4.184 J/gC

mass of water =  25 g of water.

Temperature T₁ = 25°C

Final Temperature = 38.18 °C

Difference between temperature = 13.18 °C

[tex]\rm q_{water} = 25 \times 4.18\times 13.18[/tex]

For a Foam Cup Calorimeter

[tex]\rm q_{water} = q_{cal}\\\\\\\rm 25\times4.18\times13.318 = 78 \times c_{p}\times (175-38.18)\\\\\\On \;solving\; this \;we \;get \;c_{p} = 0.129[/tex]

Therefore the  the specific heat of the gold is 0.129 J/gC

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The cation part is named first in an ionic compound and the anionic part is named with the suffix of ate, id etc. The name of the ionic compound Pb (NO₃)₂ is lead nitrate.

Ionic compounds are formed between metals and nonmetals. Metals are electron rich and can easily lose electrons to form  positively charged ions called cations.

Non-metals with electron-deficiency will gain electron from the metals and acquires a negative charge to form anions. The electrostatic force of this negative clouds and positive cloud from the cation is called ionic bonding.

For ionic compounds, the cation or metals are named first. Pb is a metal with two valence electrons and NO₃ group has a negative charge. Thus, Pb donates its two electrons each to each nitrate groups and the anionic part nitrate is named last.

Therefore, the compound name is lead nitrate.

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pH is the potential of the hydrogen in the aqueous solution. The pH of the hydrosulfuric acid is 0.6.

pH is the hydrogen or the hydronium ion concentration in the aqueous solution. The formula to calculate pH is given as,

[tex]\rm pH = \rm - log [H^{+}][/tex]

Since hydrosulfuric acid is diprotic the concentration of the hydrogen ion will be:

[tex]\begin{aligned} \rm [H^{+}] &= 2 \times 0. 571 \;\rm M \\\\&= 1.142\end{aligned}[/tex]

Now, pH is calculated as:

[tex]\begin{aligned} \rm pH &= \rm - log [H^{+}]\\\\&= \rm - log [1.142]\\\\&= 0.06\end{aligned}[/tex]

Therefore, 0.6 is the pH of the hydrosulfuric acid solution.

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Answer:

There are 5! goodluck,

Explanation:

Endothermic reactions are those in which heat is absorbed from the surroundings.

They are reactions in which heat is absorbed from the surrounding, making the reaction vessels become colder.

It is unlike exothermic reactions in which heat is released into the surrounding, making the reaction vessel to be warmer.

For endothermic reactions, the enthalpy change is always positive because heat is absorbed. It is however negative for exothermic reactions because heat is evolved.

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Answer:

B. 6CO2 + 12H2O + energy =  C6H12O6 + 6O2 + 6H2O

Explanation:

Answer: D. Alga

Explanation:

Answer:

c

Explanation:

its the only one with a downside to solar and wind.

Answer:

-268.42 C  DEGREES

Explanation:

P1/T1 = P2/T2

63 / (25+273.15) =   1 / T2

T2 =  4.73 K   = -268.42

The compound as shown  corresponds to the compound 1-ethyne.

The term hydrocarbon refers to a compound that is composed of only hydrogen and carbon. A hydrocarbon may be an alkane, alkene, alkyne or aromatic compound.

Looking at the structure of the compound as shown, the structure corresponds to the compound 1-ethyne.

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Answer:

D.

Explanation:

I took the test

Zinc nitrate has 1 molecule of zinc (Zn), 2 molecules of nitrogen (N) and 6 molecules of oxygen (O).

Calculate the molecular mass of zinc nitrate by adding the molecular weights for all molecules in the compound.

Here are the molecular weights for each element:

Zn=65.38 g/mol

N=14.01 g/mol

O=16.00 g/mol

The molecular weight of zinc nitrate is then: 1*(65.38)+2*(14.01)+6*(16.00)=189.40 g/mol.

Using a conversion formula to calculate moles of zinc nitrate:

163.97gZn(NO

3

​

)

2

​

∗

189.40gZn(NO

3

​

)

2

​

1molZn(NO

3

​

)

2

​

​

=0.866molZn(NO

3

​

)

2

​

There are 0.866 moles of zinc nitrate.

Note: These numbers may vary slightly due to the source of the molecular weight data and the number of decimal places used.

Answer:

46.8% should be. correct, I'm not fully sure though. : )

The mass percentage of the carbon in the caffeine C₈H₁₀N₄O₂ is equal to 49.48 %.

The mass percentage formula can be expressed by mass of the each element in one mole of the compound divided by the molar mass of the compound.

The mass percentage of one component in any compound can be calculated as follows:

Mass percent = (Mass of an element one mole of the compound)/(Molar mass of compound) ×100

Given, the chemical formula of the compound caffeine is C₈H₁₀N₄O₂.

The molar mass of the caffeine, C₈H₁₀N₄O₂ = 194 g/mol

We know that the atomic mass of carbon (C) = 12 g/mol

The mass of the carbon in caffeine = 8 × 12 = 108 g/mol

The mass percent of carbon = (108/194) × 100 = 49.48 %

Therefore, the mass percentage of carbon in caffeine is equal to 49.48 %.

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The conditions of temperature and pressure in which a gas least soluble in water is low pressure and high temperature.

The amount of dissolved gas in a liquid is proportional to its partial pressure above the liquid, according to Henry's law.

From this law it is clear that:

But if the temperature of the liquid decreases then the solubility of the gas also increases.

Hence at low pressure and high temperature, gas is least soluble.

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Answer:

the petrochemical industry

Explanation:

"Petrochemicals are the chemical products obtained from petroleum by refining. Some chemical compounds made from petroleum are also obtained from other fossil fuels, such as coal or natural gas, or renewable sources such as maize, palm fruit or sugar cane." - Textbook excerpt

in order to get quality of water

Approximately 0.36 grams of Cu are produced because copper (II) chloride acts as a limiting reactant.

A representation of a chemical reaction using symbols of the elements to indicate the amount of substance, usually in moles, of each reactant and product.

Based on the balanced equation of reaction and the reacting masses, approximately 0.36 grams of Cu are produced because copper (II) chloride acts as a limiting reactant.

The amount of copper produced is determined from the balanced equation of the reaction.

The equation of the reaction is given below:

3 CuCl₂ + 2 Al → 2 AlCl₃ + 3 Cu

molar mass of CuCl₂ = 132 g/mol

molar mass of Al = 27.0 g

molar mass of Cu = 64.0 g

moles of aluminium in 0.50 g = 0.50 / 27 = 0.018 moles

moles of CuCl₂ in 0.75 g = 0.75/132 = 0.00568 moles

Therefore, CuCl₂ is the limiting reactant

3 moles of CuCl₂ produces 3 moles of Cu

0.00568 moles of CuCl₂ will produce 0.00568 moles of Cu

Mass of 0.005  moles of Cu = 0.00568 * 64 = 0.36 g of Cu

Therefore, approximately 0.36 grams of Cu are produced because copper (II) chloride acts as a limiting reactant.

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The base is the species that accept hydrogen, and the acids donate hydrogen ions. Dihydrogen phosphite acts as a base and hydrosulfide sulfanide act as an acid.

Acids are molecules or chemical species that can donate a proton or a hydrogen ion to another chemical species.

Bases are the ions or molecules that accept a proton or hydrogen ion and release a hydroxide ion.

The acid and base relationship is shown as,

[tex]\rm H2PO_{3}^{-} + HS^{-} \leftrightarrows S^{-} + H_{3}PO_{3}[/tex]

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Answer:

37.7%

Explanation:

58% of 65 is 37.7%

0.13 atm pressure is required to contain 0.644 grams of nitrogen gas ([tex]N_{2}[/tex]) in a 4.2 L container at a temperature of 20 degrees Celsius.

The ideal gas equation, pV = nRT, is an equation used to calculate either the pressure, volume, temperature or number of moles of a gas. The terms are: p = pressure, in pascals (Pa). V = volume, in [tex]m^3[/tex].

Calculating moles of [tex]N_{2}[/tex]:

Moles = [tex]\frac{Given mass}{ molar mass}[/tex]

Moles = [tex]\frac{0.644 }{ 28}[/tex]

Moles = 0.023

Now, using the Ideal Gas Law;

PV=nRT

We can rearrange to solve for pressure:

P=nRT/V

P is pressure, n is the number of moles (0.023), R is a constant (0.08206 L*atm/mol*K), T is the temperature in Kelvin (293.15K) and V is volume, 4.2 L.

So, plugging in;

P=[tex]\frac{(\;0.023\;mol)(0.08206\;L*\;atm\;/\;mol\;*\;K)(\;293.15\;K)}{(\;4.2\; L)}[/tex]

P=0.1317 atm

Hence, 0.13 atm pressure is required to contain 0.644 grams of nitrogen gas ([tex]N_{2}[/tex]) in a 4.2 L container at a temperature of 20 degrees Celsius.

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A NaCl solution of 350 mL volume and a concentration of 0.277 M will contain 5.67 grams of the salt.

Recall that:

Mole = molarity x volume.

Also:

Mass = mole x molar mass

Hence;

Mole of 350 mL, 0.277 NaCl = 0.350 x 0.277 = 0.097 moles

Mass of 0.097 moles NaCl = 0.097 x 58.44 = 5.67 grams

Thus, a 350 mL, 0.277 M NaCl solution will contain 5.67 grams of the salt.

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751/760 x 1 atm = 0.988 atm

If spin is not included, there are 4 different waves functions correspond to the first excited level n = 2 for hydrogen.

In quantum mechanics, a wave function is a variable quantity that mathematically describes a particle's wave characteristics.

The probability of a particle being present at a given point in space and time is related to the value of the particle's wave function.

Thus, there are 4 different waves functions correspond to the first excited level n = 2 for hydrogen.

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Answer:

9.35 × 10⁵

Explanation:

( 6.50 × 10⁴ ) + ( 8.70 × 10⁵ ) = 935,000

935,000 = 9.35 × 10⁵