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2 years ago

Hello comets~help me with these questions

Chemistry

2 answers:

Mrrafil [7]2 years ago

8 0

Answer:

Explanation:

Brine is a concentrated solution of sodium chloride. Strictly speaking, sodium chloride does not exist in the solution as it completely dissociates into Na+ and Cl- in water.

Other ions that may exit include Potassium (K+), Magnesium (Mg++), Calcium (Ca++), Bromide (Br-), Iodide (I-)

The only halide of Beryllium that is ionic is BeF2 while other halides like BeCl2, BeBr2 and BeI2 are highly covalent.

Beryllium halides are mostly covalent due to smaller size and relatively high charge on Be+2 ion.

Another fun fact about Beryllium Floride is that it exists as a glass in solid state, with four-coordinate Be(2+) tetrahedral centers and two-coordinate fluoride centers.

Vadim26 [7]2 years ago

4 0

Impurities of brine solution

calcium chloride
calcium sulphate
magnesium chloride
sodium sulphate

Characteristics of halides of beryllium

covalent bond
does not conduct electricity
In organic solvents, it is soluble.

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How many potassium atoms are present in 0.01456 g of potassium??

leva [86]

Its going to be 2.81 x 1023 atoms

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3 years ago

A crime-scene is roped off with yellow tape. The rectangular area is 5.6 meters long 10.75 meters wide. What is the area of the

maksim [4K]

The area is 60.2, to find area it's length times width.

7 0

3 years ago

An electrochemical cell has the following standard cell notation.

icang [17]

The cell notation is:

$Mg(s)|Mg^{+2}(aq)||Ag^{+}(aq)|Ag(s)$

here in cell notation the left side represent the anodic half cell where right side represents the cathodic half cell

in anodic half cell : oxidation takes place [loss of electrons]

in cathodic half cell: reduction takes place [gain of electrons]

1) this is a galvanic cell

2) the standard potential of cell will be obtained by subtracting the standard reduction potential of anode from cathode

$E^{0}_{Mg}=-2.38V$

$E^{0}_{Ag}=+0.80V$

Therefore

$E^{0}_{cell}=0.80-(-2.38)=+3.18V$

3) as the value of emf is positive the reaction will be spontaneous as the free energy change of reaction will be negative

Δ $G^{0}=-nFE^{0}$

As reaction is spontaneous and there will be conversion of chemical energy to electrical energy it is a galvanic cell.

7 0

3 years ago

A sailor on a trans-Pacific solo voyage notices one day that if he puts 735.mL of fresh water into a plastic cup weighing 25.0g,

Gennadij [26K]

Answer:

Amount of salt in 1 L seawater = 34 g

Explanation:

According to Archimedes' principle, mass of freshwater and cup = mass of equal volume of seawater

mass of freshwater = density * volume

1 cm³ = 1 mL

mass of freshwater = 0.999 g/cm³ * 735 cm³ = 734.265 g

mass of freshwater + cup = 734.265 + 25 = 759.265 g

Therefore, mass of equal volume of seawater = 759.265 g

Volume of seawater displaced = 735 mL = 0.735 L (assuming the cup volume is negligible)

1 liter = 1000 cm³ = 1000 mL;

Density of seawater = mass / volume

Density of seawater = 759.265 g / 0.735 L = 1033.01 g/L

Density of freshwater in g/L = 0.999 g/ (1/1000) L = 999 g/L

mass of 1 Liter seawater = 1033.01 g

mass of 1 Liter freshwater = 999 g

mass of salt dissolved in 1 L of seawater = 1033.01 g - 999 g = 34.01 g

Therefore, amount of salt in 1 L seawater = 34 g

4 0

3 years ago

Write the name of the main gases in the air

Delicious77 [7]

Answer:

Nitrogen

Oxygen

Argon

Carbon Dioxide

Methane

Ozone

Explanation:

N₂ accounts for 78% of the atmosphere.

O₂ accounts for 21% of the atmosphere.

Ar accounts for 0.9% of the atmosphere.

CO₂, CH₄, and O₃ only take up 0.1% of the atmosphere.

3 0

3 years ago

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Hello comets~help me with these questions ​

Hello comets~help me with these questions