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3 years ago

Help me due tomorrow :,)

Chemistry

1 answer:

lesya [120]3 years ago

3 0

Zinc displaces copper

It means

Zinc is more reactive than copper

Zinc+Copper sulphate--> Zinc sulphate+Copper

No reaction because

Magnesium is more reactive than zinc

Reaction occurs

Iron is more reactive than copper
Magnesium is more reactive than iron

Order:-

Cu<Fe<Zn<Mg

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A movable piston traps 0.205 moles of an ideal gas in a vertical cylinder. If the piston slides without friction in the cylinder

Mazyrski [523]

Answer : The work done on the gas will be, 418.4 J

Explanation :

First we have to calculate the volume at 270°C.

$PV_1=nRT$

where,

P = pressure of gas = 1 atm

$V_1$ = volume of gas = ?

T = temperature of gas = $270^oC=273+270=543K$

n = number of moles of gas = 0.205 mol

R = gas constant = 0.0821 L.atm/mol.K

Now put all the given values in the ideal gas equation, we get:

$(1atm)\times V_1=0.205mol\times 0.0821L.atm/mol.K\times 543K$

$V_1=9.12L$

Now we have to calculate the volume at 24°C.

$PV_2=nRT$

where,

P = pressure of gas = 1 atm

$V_2$ = volume of gas = ?

T = temperature of gas = $24^oC=273+24=297K$

n = number of moles of gas = 0.205 mol

R = gas constant = 0.0821 L.atm/mol.K

Now put all the given values in the ideal gas equation, we get:

$(1atm)\times V_2=0.205mol\times 0.0821L.atm/mol.K\times 297K$

$V_2=4.99L$

Now we have to calculate the work done.

Formula used :

$w=-p\Delta V\\\\w=-p(V_2-V_1)$

where,

w = work done

p = pressure of the gas = 1 atm

$V_1$ = initial volume = 9.12 L

$V_2$ = final volume = 4.99 L

Now put all the given values in the above formula, we get:

$w=-p(V_2-V_1)$

$w=-(1atm)\times (4.99-9.12)L$

$w=4.13L.artm=4.13\times 101.3J=418.4J$

conversion used : (1 L.atm = 101.3 J)

Therefore, the work done on the gas will be, 418.4 J

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3 years ago

How many hydrogen atoms Is needed for C2H2 to become saturated

Phoenix [80]

It needs four hydrogen atoms

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3 years ago

The equilibrium-constant expression for a reaction written in one direction is the __________ of the one for the reaction writte

VLD [36.1K]

Answer:

reciprocal

Explanation:

The equilibrium constant for an equilibrium reaction is the ratio of the equilibrium constant for the forward reaction, Kf, to the equilibrium constant for the reverse reaction, Kr:

For A ⇄ B

The forward reaction is: A → B, with rate constant is Kf = K₁ and
The reverse reaction is: B → A, with rate constant Kr = K₂

$K_{eq}=\dfrac{K_f}{K_r}=\dfrac{K_1}{K_2}$

When you write the reaction in the other reaction, the forward and the reverse reaction are exchanged:

For B ⇄ A

The forward reaction is B → A, with rate constant Kf = K₂
The reverse reaction is A → B, with rate constant Kr = K₁

$K'_{eq}=\dfrac{K_f}{K_r}=\dfrac{K_2}{K_1}$

As you see:

$K'_{eq}=\dfrac{1}{K_{eq}}$

Thus, the equilibrium-constant expression for a reaction written in one direction is the  reciprocal___ of the one for the reaction written for the reverse direction.

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4 years ago

Which term describes this reaction?

castortr0y [4]

Answer:Biopolymer: the monomeric amino acids are linked through an

amide bond (the carboxylic acids of one AA with the α-amino

group of a second)

Explanation:

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3 years ago

What is most misleading about the contour map shown below?

Verizon [17]

Answer: The contour interval is inconsistent.

Explanation: I just too the test and this is the correct answer.

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4 years ago