1. A sample of air has a volume of 140.0 mL at 273 K. To what temperature must the
gas be lowered to reduce its volume to 50.0 mL, at a constant pressure?

Answer:

true

Explanation:

Answer:

Sift the mixture to separate the rock from the iron filings, soil and salt.

You can then use a magnet to separate the iron filings from the salt and soil.

Afterwards, you can pour water into the remaining salt- soil mixture. Salt will dissolve but the soil will remain at the bottom of the water.

If you want to separate the salt from the water, you can boil it till all the water evaporates. The only thing that'd be left in the pan is salt.

Answer:

Its a chemical conducting electricity

Answer:

The pH of pure water is 7, the negative logarithm of 1 X 10-7. A neutral solution is one that is neither acidic nor basic. The hydrogen ion concentration equals the hydroxide ion concentration, and both equal 1 X 10-7 M. In a neutral solution, then, pH = pOH = 7.

Explanation:

The hydrogen ion concentration equals the hydroxide ion concentration, and both equal  to [tex]1 X 10^{-7}[/tex] M. Hence, in a neutral solution, then, pH = pOH = 7.

pH is a quantitative measure of the acidity or basicity of aqueous or other liquid solutions.

pOH is calculated by taking negative logarithm of hydroxide ion concentration.

The pH of pure water is 7, the negative logarithm of [tex]1 X 10^{-7}.[/tex]

A neutral solution is one that is neither acidic nor basic.

The hydrogen ion concentration equals the hydroxide ion concentration, and both are equal to [tex]1 X 10^{-7}[/tex] M.

Hence, in a neutral solution, then, pH = pOH = 7.

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Answer:

yup!

Explanation:

i dont know what else to say.

If 2500 grams of H2SO4 react with excess NH3 according to the illustration, the amount of ammonium sulfate that can be produced would be 3,370.92 grams. If only 3100 grams of ammonium sulfate were produced, the percentage yield would be 91.96%.

From the equation of the reaction:

2NH3(aq) + H2SO4(aq) → (NH4)2SO4(aq)

The mole ratio of H2SO4 and (NH4)2SO4 is 1:1

Mole of 2500 grams H2SO4 = 2500/98 = 25.51 moles

Equivalent mole of (NH4)2SO4 = 25.51 moles

Mass of 25.51 moles (NH4)2SO4 = 25.51 x 132.14 = 3,370.92 grams

If 3100 g of (NH4)2SO4 were actually produced, the percentage yield would be:

Percent yield = 3100/3370.92 x 100 = 91.96%

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Answer: the interactions that are going on with the intermolecular. And depending how much space their is between each particle.

Explanation: Gases behave the least like ideal gases at low temperatures in high pressures because of the interactions that are going on with the intermolecular. And depending how much space their is between each particle. And whether the sizes are compared to small or large spaces are really insignificant.

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They will move backward at a lower speed than the basketball moves forward.

The principle of conservation of linear momentum states that the sum of the initial momentum is equal to sum of final momentum.

Initial momentum = Final momentum

The forward momentum of the basketball = Backward momentum of the person and the chair

Since the mass of the person and the chair is greater than the mass of the basketball, the person and the rolling chair will move backward at a lower speed than the basketball moves forward.

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A 1.50-L vessel is filled with helium at 25.0 °C and 3.04 atm. Under these conditions, the mass of helium is 0.744 g.

An ideal gas is that whose particles have negligible volume and intermolecular forces.

A 1.50 L vessel at 25.0 °C contains He at a pressure of 3.04 atm.

We will use the following expression.

K = °C + 273.15 = 25.0 + 273.15 = 298.2 K

We will use the ideal gas equation.

P × V = n × R × T

n = P × V / R × T

n = 3.04 atm × 1.50 L / (0.0821 atm.L/mol.K) × 298.2 K = 0.186 mol

The molar mass of He is 4.00 g/mol.

0.186 mol × 4.00 g/mol = 0.744 g

A 1.50-L vessel is filled with helium at 25.0 °C and 3.04 atm. Under these conditions, the mass of helium is 0.744 g.

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Explanation:

hello

2K + 2H2O ==》2KOH + H2

Answer:

b. 16 protons, 18 neutrons, and 18 electrons

Explanation:

Things to be remembered

Negative charge on any ionic species indicates gained the electrons

Positive charge on any ionic species indicates lost the electrons

A sulfur atom has 16 protons, 18 neutrons, and 16 electrons, A sulfide ion has a 2– charge which indicates that sulphur has gained two electron from any other atom, ion or species!

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Answer:

95.965 grams

Explanation:

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.

Then you can apply the following rule of three: if 6.023×10²³ molecules are contained in 1 mole of NH₃, then 3.4×10²⁴ molecules are contained in how many moles of NH₃?

amount of moles of NH₃= (3.4×10²⁴ atoms × 1 mole)÷ 6.023×10²³ atoms

amount of moles of NH₃= 5.645 moles

Being the molar mass of NH₃, that is, the amount of mass that a substance contains in one mole, 17 , then the amount of mass that 5.645 moles of the compound contain can be calculated as:

5.645 moles× 17=  95.965 grams

Finally, 95.965 grams of NH₃ are in 3.4×10²⁴ molecules of NH₃.

Answer:

the dendritic cell consumes the pathogen by phagocytosis

The minimum mass of Zinc, Zn that needs to be added to 0.500 g of iodine so that the iodine fully reacts is 0.128 g

Zn + I₂ —> ZnI₂

Molar mass of Zn = 65 g/mol

Mass of Zn from the balanced equation = 1 × 65 = 65 g

Molar mass of I₂ = 127 × 2 = 254 g/mol

Mass of I₂ from the balanced equation = 1 254 = 254 g

SUMMARY

From the balanced equation above,

254 g of I₂ required 65 g of Zn

From the balanced equation above,

254 g of I₂ required 65 g of Zn

Therefore,

0.5 g of I₂ will require = (0.5 × 65) / 254 = 0.128 g of Zn

Thus, the minimum mass of Zn required is 0.128 g

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Answer and Explanation: The answer is false.

Answer:

ion

Explanation:

more protons than electrons

Answer:

The answer is It recognizes specific common pathogens. :)

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Denatured alcohol and isopropyl alcohol are as similar as they as different. They are both used for cleaning and harmful to people if ingested. But isopropyl seems to be more effective than denatured alcohol. Denatured alcohol has been found to be more toxic and can harm our skin. But when it comes to cleaning, denatured alcohol can be used, but should not be used over isopropyl as it can leave behind residue, especially when it comes to electronic devices. Isopropyl, especially 70%, is more effective because it has more water, which can help it dissolve more slowly, penetrate cells, and kill bacteria.

Answer:

55 degrees F - cold water

120 degrees F

the last on I don't know

- Water is known to be the universal solvent because of its ability to dissolve more particles than any other liquid.

- Cohesion is the property of water to attract other molecules. This helps in making solutions that are essential for most life to propagate.

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Answer:

concentration [H_3O^+][H3O+] decreased by 4.46334\sdot10^{-4}M.4.46334⋅10−4M.

Explanation:

pH=−log[H3O+]; [H_3O^+]=10^{-pH};[H3O+]=10−pH;

If pH=3.350;pH=3.350;

[H_3O^+]=10^{-3.35}=4.467\sdot10^{-4}M;[H3O+]=10−3.35=4.467⋅10−4M;

If pH=6.780;pH=6.780;

[H_3O^+]=10^{-6.78}=1.66\sdot10^{-7}M;[H3O+]=10−6.78=1.66⋅10−7M;

4.467\sdot10^{-4}-1.66\sdot10^{-7}=4467\sdot10^{-7}-1.66\sdot10^{-7}=4465.34\sdot10^{-7}=4.467⋅10−4−1.66⋅10−7=4467⋅10−7−1.66⋅10−7=4465.34⋅10−7=

=4.46534\sdot10^{-4}M;=4.46534⋅10−4M;

The positive difference in concentration of [[tex]H_3O^+[/tex]] is [tex]4.46534 X 10^{-4}M[/tex] when NaOH was added to a 7.75 x [tex]10^-3[/tex] M solution of HCl so that the end solution has a pH of 3.500.

It is the measure of how much of a given substance there is mixed with another substance.

pH=−log[[tex]H_3O^+[/tex]]

[[tex]H_3O^+[/tex]]=[tex]10^{-pH}[/tex]

[[tex]H_3O^+[/tex]]=[tex]10^-^p^H[/tex]

If pH=3.350

pH=3.350

[[tex]H_3O^+[/tex]]=[tex]10^{-3.35}[/tex]=[tex]4.467 X 10^{-4}M[/tex]

[[tex]H_3O^+[/tex]]=[tex]10^{-3.35}[/tex]

=[tex]4.467 X 10^{-4}M[/tex]

If pH=6.780

pH=6.780

[[tex]H_3O^+[/tex]]= [tex]10^{-6.78}[/tex]=[tex]1.66 X 10^{-7}M[/tex]

Hence, the positive difference in concentration of [[tex]H_3O^+[/tex]] is[tex]= 4.46534 X 10^{-4}M[/tex]

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[tex]\tt [OH^-]=\sqrt{Kb.M}[/tex]

[OH⁻]=√1.76.10⁻⁵.0.188

[OH⁻]=1.81 x 10⁻³

pOH = 3 - log 1.81

pH = 11 + log 1.81

Based on the mechanism shown above, the correct rate law that is consistent with the sample reaction is [tex]B+D \rightarrow ^{k_{-1}} E+C[/tex].

Rate law can be defined as a chemical equation that is used to relate the initial (forward) chemical reaction rate with respect to the concentrations of both the chemical reactants and constant parameters.

Mathematically, the rate law is given by this formula:

[tex]R = K[A]^x[B]^y[C]^z[/tex]

Where:

Based on the mechanism shown above, the correct rate law that is consistent with the sample reaction is as follows:

                                       [tex]B+D \rightarrow ^{k_{-1}} E+C[/tex]

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The rate of forward reaction equal to the rate of reverse reaction hence  the amount of reactants will never reach zero.

A chemical reaction involves the combnation of two or more species to yiled products. We must know that a point is always reached in a reaction when the rate of forward reaction equal to the rate of reverse reaction hence  the amount of reactants will never reach zero.

Also, if the reaction starts with 0 molecules of reactants and 100 molecules of products, the amount of products will decrease overtime.

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The reaction which shows oxidation and reduction simultaneously is C₆H₁₂O₆(s) + 6O₂(g) → 6CO₂(g) + 6H₂O(l).

Those reaction in which oxidation as well as reduction of substances takes place simultaneously will known as redox reactions.

Above reaction are not the redox reactions as in these reaction oxidation and reduction simultaneously not takes place.

In the above reaction reduction of oxygen takes place as its oxidation state changes from 0 to -2, and at the same time oxidation of carbon takes place as its oxidation state changes from 0 to +4.

Hence correct option is (4).

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Answer:

correct option is (4).

Explanation:

Answer:

11.3 M

Explanation:

Na = 22.989 gm/mole

Cl = 35.45 gm/mole    so Na Cl = 58.439 gm/mole

(19.5 / 58.439 )/ (29.5/1000) = 11.3 M