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kirill [66]
3 years ago
13

Does anyone know how to do these?

Chemistry
1 answer:
tia_tia [17]3 years ago
6 0

Number 17 means oxygen.

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which one of the following statements about sodium chloride is incorrect a) within the crystal, each sodium ion is surrounded by
Firlakuza [10]
The answer is D) the bonding in sodium chloride crystals is strong
5 0
2 years ago
Suppose 1.87g of nickel(II) bromide is dissolved in 200.mL of a 52.0mM aqueous solution of potassium carbonate.
Reika [66]

Answer:

0.0428 M

Explanation:

Because we're asked to calculate the molarity of nickel(II) cation, we need to <u>determine all sources for that species</u>, in this case, all Ni⁺² comes from the nickel(II) bromide solid (NiBr₂).

We use the molecular weight of NiBr₂ to calculate the moles of Ni:

1.87 g NiBr₂ ÷ 218.49g/mol * (1molNi⁺²/1molNiBr₂) =  8.55x10⁻³ mol Ni⁺²

Then we <u>divide the moles by the volume in order to calculate the concentration</u>:

8.55x10⁻³ mol Ni⁺² / 0.200 L = 0.0428 M

7 0
2 years ago
If air contains 78% Nitrogen by volume, what is the solubility of nitrogen in water at 25 degree celisus​
Svet_ta [14]

The solubility of nitrogen in water at 25 °C= 4.88 x 10⁻⁴ mol/L

<h3>Further explanation</h3>

Given

78% Nitrogen by volume

Required

The solubility of nitrogen in water

Solution

Henry's Law states that the solubility of a gas is proportional to its partial pressure  

Can be formulated  

S = kH. P.  

S = gas solubility, mol / L  

kH = Henry constant, mol / L.atm  

P = partial gas pressure  

In the standard 25 C state, the air pressure is considered to be 1 atm, so the partial pressure of N₂ -nitrogen becomes:

Vn / Vtot = Pn / Ptot

78/100 = Pn / 1

Pn = 0.78 atm

Henry constant for N₂ at 25 °c = 1600 atm/mol.L=6.25.10⁻⁴ mol/L.atm

The solubility :

\tt S=6.25.10^{-4}\times 0.78\\\\S=4.88\times 10^{-4}~mol/L

7 0
2 years ago
While watching a popular space-based science fiction movie, space
Jobisdone [24]

Answer:

Sound waves required a medium.

Explanation:

In space, there is only vacuum hence no any medium for sound wave travel.

Since sound waves are mechanical waves, they require a material medium such as air, hence no sound transmission.

5 0
3 years ago
Which is a chemical property of mercury? (2 points)
nevsk [136]
D) reacts with oxygen
All other are physical properties.
4 0
3 years ago
Read 2 more answers
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