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Gala2k [10]
4 years ago
13

How is precipitation useful in our daily lives?

Chemistry
1 answer:
Alex73 [517]4 years ago
3 0

Answer:

The precipitation reaction is the double displacement reaction in which  two ionic bonds combine forming up insoluble salts.

Precipitation reaction can be used in our daily life in events such as in waste water treatment. When a contaminant forms an insoluble solid, then we can use this reaction to precipitate out the contaminated ions.

The rings which form in the bathtubs are also an example of the precipitation reactions.

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An aqueous solution of sodium sulfide is allowed to react with an aqueous solution of magnesium chloride.
olya-2409 [2.1K]

Answer : The correct option is, (b) 2Na^+

Explanation :

Complete ionic equation : In complete ionic equation, all the substance that are strong electrolyte and present in an aqueous are represented in the form of ions.

Net ionic equation : In the net ionic equations, we are not include the spectator ions in the equations.

Spectator ions : The ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides.

The balanced molecular equation will be,

Na_2S(aq)+MgCl_2(aq)\rightarrow 2NaCl(aq)+MgS(s)

The complete ionic equation in separated aqueous solution will be,

2Na^+(aq)+S^{2-}(aq)+Mg^{2+}(aq)+2Cl^{-}(aq)\rightarrow 2Na^+(aq)+2Cl^{-}(aq)+MgS(s)

In this equation the species Na^+\text{ and }Cl^{-} are the spectator ions.

Hence, the complete ionic equation contains specie is 2Na^+

4 0
3 years ago
If the accepted value for the mass of an object is 20.0g and the student found that the mass of the object was 20.5g what is the
NikAS [45]

Answer:

Results

The percent error between 20 and 20.5 is 2.5%

Explanation:

Percent Error = | (20.5 − 20) / 20 | × 100 = | (0.5) / 20 | × 100 = | 0.025 | × 100 = 2.5% (three decimal places)Percent Error = 2.5%

3 0
3 years ago
g 32.53 g of a solid is heated to 100.oC and added to 50.0 g of water in a coffee cup calorimeter and the contents are allowed t
Radda [10]

Answer:

0.886 J/g.°C

Explanation:

Step 1: Calculate the heat absorbed by the water

We will use the following expression

Q = c × m × ΔT

where,

  • Q: heat
  • c: specific heat capacity
  • m: mass
  • ΔT: change in the temperature

Q(water) = c(water) × m(water) × ΔT(water)

Q(water) = 4.184 J/g.°C × 50.0 g × (34.4 °C - 25.36 °C) = 1.89 × 10³ J

According to the law of conservation of energy, the sum of the energy lost by the solid and the energy absorbed by the water is zero.

Q(water) + Q(solid) = 0

Q(solid) = -Q(water) =  -1.89 × 10³ J

Step 2: Calculate the specific heat capacity of the solid

We will use the following expression.

Q(solid) = c(solid) × m(solid) × ΔT(solid)

c(solid) = Q(solid) / m(solid) × ΔT(solid)

c(solid) = (-1.89 × 10³ J) / 32.53 g × (34.4 °C - 100. °C) = 0.886 J/g.°C

8 0
3 years ago
Which of the following most likely requires intermolecular forces?
Shtirlitz [24]

Answer: The intermolecular forces increase with increasing polarization of bonds. Boiling point increases with molecular weight, and with surface area. The three major types of intermolecular interactions are dipole–dipole interactions, London dispersion forces (these two are often referred to collectively as van der Waals forces), and hydrogen bonds. Intermolecular forces are much weaker than the intramolecular forces of attraction but are important because they determine the physical properties of molecules like their boiling point, melting point, density, and enthalpies of fusion and vaporization.In order from strongest to weakest, the intermolecular forces given in the answer choices are: ion-dipole, hydrogen bonding, dipole-dipole, and Van der Waals forces. Ionic bonding is stronger than any of the given intermolecular forces, but is itself NOT an intermolecular force.

Hope this helps.. Stay safe and have a Merry Christmas!!!!!!!!!! :D

8 0
3 years ago
Read 2 more answers
Which has the lowest freezing point?
Volgvan

Answer:

Mercury has the lowest freezing point for metals, but helium takes the winner for all substances.

Explanation:

5 0
3 years ago
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