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3 years ago

Which reaction is an example of a precipitation reaction?

Chemistry

2 answers:

DENIUS [597]3 years ago

8 0

Answer: Option (A) is the correct answer.

Explanation:

When two aqueous solutions chemically combine together then there is a possibility that an insoluble solid substance might form. This insoluble substance is known as a precipitate and this type of reaction is known as precipitation reaction.

For example, $FeCl_{3}(aq) + 3KOH(aq) \rightarrow Fe(OH)_{3}(s) + 3KCl(aq)$

Here, $Fe(OH)_{3}(s)$ is the precipitate.

Thus, we can conclude that out of the given options, the reaction $FeCl_{3}(aq) + 3KOH(aq) \rightarrow Fe(OH)_{3}(s) + 3KCl(aq)$ is an example of a precipitation reaction.

Klio2033 [76]3 years ago

3 0

Answer:

(A) FeCl3 (aq) + 3 KOH (aq) → Fe(OH)3 (s) + 3 KCl (aq)

Explanation:

A precipitation reaction happens when a solid (called a precipitate) is formed due the reaction between anions and cations that were previously in aqueous solution.

In B there were no cations or anions that interacted

In C, and D, cations and anions interacted but no solid (precipitate was formed)

In E the cations interacted with a solid and no precipitate was formed.

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Katen [24]

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Explanation:

The formula for velocity of an electron in the nth orbit is given as,

v = 2π2 Kme2 Z / nh

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Z= atomic number

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3 years ago

Explain how water might have two different densities

MrMuchimi

Answer:

I think this is it

Water can have two different densities if it has substances dissolved in it. ... When liquid water freezes it becomes solid water or ice, which is less dense than liquid water. The fact that solid water (ice) is less dense than liquid water is evident in the way ice floats in a glass of water.

Explanation:

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3 years ago

A pound of margarine costs $1.39. What is the cost of a kilogram of margarine

den301095 [7]

Answer:

3.064 $

Solution:

First of all we will find the number of pounds contained by one Kg. Therefore, it is found that,

1 Kilogram = 2.20462 Pounds

Hence, as given,

1 Pound of Margarine costs = 1.39 Dollars

So,

2.20462 Pounds Margarine will cost = X Dollars

Solving for X,

X = (2.20462 Pounds × 1.39 Dollars) ÷ 1 Pound

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3 years ago

A scientist measures the standard enthalpy change for the following reaction to be -17.2 kJ : Ca(OH)2(aq) 2 HCl(aq)CaCl2(s)

elixir [45]

Answer: $\Delta H^{0}=-173.72$ kJ/mol

Explanation: Enthalpy Change is the amount of energy in a reaction - absorption or release - at a constant pressure. So, Standard Enthalpy of Formation is how much energy is necessary to form a substance.

The standard enthalpy of formation of HCl is calculated as:

$\Delta ^{0}=\Sigma H_{products}-\Sigma H_{reactants}$