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Artyom0805 [142]
3 years ago
9

Which list of atomic model descriptions represents the order of historical development

Chemistry
1 answer:
Ilya [14]3 years ago
5 0

Answer:

percocets

Explanation:

deals wit pain help with healing

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The partial pressures of the gases in a mixture are 0.255 atm 0, 3.24 atm Ny,
katovenus [111]
<h3>Answer:</h3>

4.945 atm

<h3>Explanation:</h3>
  • Based on Dalton's law of Partial pressure, the total pressure of a mixture of gases is equivalent to the sum of individual partial pressures of the gases in the mixture.
  • That is;

Pt = P1+P2+P3+P4+............+ Pn

In this case;

Partial pressure of Oxygen, P(O) = 0.255 atm

Partial pressure of N, P(N) = 3.24 atm

Partial pressure of Ar, P(Ar) = 1.45 atm

Therefore;

P(total) = P(O) + P(N) + P(Ar)

           = 0.255 atm + 3.24 atm + 1.45 atm

           = 4.945 atm

Therefore, the total pressure of the mixture is 4.945 atm

6 0
4 years ago
The test tube that contained the calcium metal was probably the most difficult of the test tubes to clean. Why was aqueous HCl u
natita [175]

Answer:

The HCl will dissolve the calcium readily

Explanation:

HCl will react with d calcium, dissolving it to produce Hydrogen gas

6 0
3 years ago
Given that the freezing point depression constant for water is 1.86°c kg/mol, calculate the change in freezing point for a 0.907
melamori03 [73]

Answer : The correct answer for change in freezing point = 1.69 ° C

Freezing point depression :

It is defined as depression in freezing point of solvent when volatile or non volatile solute is added .

SO when any solute is added freezing point of solution is less than freezing point of pure solvent . This depression in freezing point is directly proportional to molal concentration of solute .

It can be expressed as :

ΔTf = Freezing point of pure solvent - freezing point of solution = i* kf * m

Where : ΔTf = change in freezing point (°C)

i = Von't Hoff factor

kf =molal freezing point depression constant of solvent.\frac{^0 C}{m}

m = molality of solute (m or \frac{mol}{Kg} )

Given : kf = 1.86 \frac{^0 C*Kg}{mol}

m = 0.907 \frac{mol}{Kg} )

Von't Hoff factor for non volatile solute is always = 1 .Since the sugar is non volatile solute , so i = 1

Plugging value in expression :

ΔTf = 1* 1.86 \frac{^0 C*Kg}{mol} * 0.907\frac{mol}{Kg} )

ΔTf = 1.69 ° C

Hence change in freezing point = 1.69 °C

5 0
3 years ago
The equation X + Y yields 
masha68 [24]
Most likely the equation yields a new compound XY. This is a synthesis reaction. <span>Synthesis reaction is a reaction where two or more substances combine to form a new compound. It is a reaction which releases energy in the form of heat and light. Therefore, it is an exothermic reaction.</span>
6 0
4 years ago
Calculate the pH of a solution that has [H3O+]=4.3 x 10^-5 M
Neko [114]

Answer:

pH = 4.4

Explanation:

pH = -log[H₃O⁺]

     = -log(4.3 × 10⁻⁵)

pH = 4.37 = 4.4

I'm actually learning this in my chemistry class right now lol. Hope this helps though. :)

6 0
3 years ago
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