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3 years ago

Which equations represent precipitation reactions?

Chemistry

1 answer:

viktelen [127]3 years ago

3 0

In a precipitation reaction, one of the product formed is an insoluble precipitate.

The given reactions can be written with phases included as:

A. $Na_{2}S(aq)+FeBr_{2}(aq)-->2NaBr(aq)+FeS(s)$ : In this reaction one of the product, FeS is insoluble. Therefore, this is a precipitation reaction.

B. $MgSO_{4}(aq)+CaCl_{2}(aq)-->MgCl_{2}(aq)+CaSO_{4}(s)$ : In this reaction, the product $CaSO_{4}$ is a solid(insoluble). So, this is a precipitation reaction too.

C. $LiOH(aq)+NH_{4}I(aq)-->LiI(aq)+NH_{4}OH(aq)$ : In this reaction, both the products are soluble. So this is not a precipitation reaction.

D. $2NaCl(aq)+K_{2}S(aq)-->Na_{2}S(aq)+2KCl(aq)$ : In this reaction, both the products are soluble. So this is not a precipitation reaction.

E. $AgNO_{3}(aq)+NaCl(aq)-->AgCl(s)+NaNO_{3}(aq)$ : In this reaction, the product AgCl is a precipitate. So, it is a precipitation reaction.

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kvv77 [185]

The volume of the granite piece in Cm³ is 12.2 cm³

calculation

volume of granite = (volume of cylinder after placing granite - volume of cylinder before placing granite

= 37.2 ml - 25.0 ml = 12.2 ml

convert ml to Cm³

that is 1 ml = 1 cm³

12.2 ml = ? cm³

by cross multiplication

=(12.2 ml x 1 cm³) / 1 ml = 12.2 cm³

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The reaction below virtually goes to completion because cyanide ion forms very stable complexes with Ni2+ ion:[Ni(H2O)6]2+(aq) +

MAVERICK [17]

Answer:

Option A and D are correct.

Unstable species react rapidly.

Stable species do not react rapidly.

Explanation:

The complete question is attached to this solution.

The more stable a reactant is, the less reactive it will be. A stable reactant has a very stable structure in which it will avoid any perturbations. And for a reaction to occur, the bonds in the reactant must break down to form the products. A stable reactant has very strong bonds that aren't easy to break down, hence, reactions involving very stable reactants do not proceed rapidly.

And the more unstable a reactant specie is, the more rapidly it reacts. This is why the reaction involving the less stable isotope of carbon; Carbon-14 is very rapid. It is the same reason as explained above that is responsible for this. The bond between unstable species are not strong and are easily breakable, thereby leading to a quick reaction.

Hope this Helps!!!

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2 years ago

Determine the molar mass of a compound that has a density of 0.1633 g/L at STP. (show work)

hodyreva [135]

Answer:

M.Mass = 3.66 g/mol

Data Given:

M.Mass = M = ??

Density = d = 0.1633 g/L

Temperature = T = 273.15 K (Standard)

Pressure = P = 1 atm (standard)

Solution:

Let us suppose that the gas is an ideal gas. Therefore, we will apply Ideal Gas equation i.e.

P V = n R T ---- (1)

Also, we know that;

Moles = n = mass / M.Mass

Or, n = m / M

Substituting n in Eq. 1.

P V = m/M R T --- (2)

Rearranging Eq.2 i.e.

P M = m/V R T --- (3)

As,

Mass / Volume = m/V = Density = d

So, Eq. 3 can be written as,

P M = d R T

Solving for M.Mass i.e.

M = d R T / P

Putting values,

M = 0.1633 g/L × 0.08205 L.atm.K⁻¹.mol⁻¹ × 273.15 K / 1 atm

M = 3.66 g/mol

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