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spin [16.1K]
3 years ago
14

scientist are always learning new things. which of the following shows how scientist use observations to gain new understanding

about the world?
Chemistry
2 answers:
Step2247 [10]3 years ago
8 0
Please provide whatever follows your question. Without it we cannot answer the question.
Black_prince [1.1K]3 years ago
5 0

What are the options? I can not help unless yo provide this information.


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What is the density of 53.4 wt aqueous naoh?
zhenek [66]

Missing question: what is the density of 53.4 wt% aqueous NaOH if 16.7 mL of the solution diluted to 2.00L gives 0.169 M NaOH?

Answer is: density is 1.52 g/mL.

c₁(NaOH) = ?; molarity of concentrated sodium hydroxide.

V₁(NaOH) = 16.7 mL; volume of concentrated sodium hydroxide.

c₂(NaOH) = 0.169 M; molarity of diluted sodium hydroxide.

V₂(NaOH) = 2.00 L · 1000 mL/L = 2000 mL; volume of diluted sodium hydroxide.  

Use equation: c₁V₁  = c₂V₂.

c₁ = c₂V₂ / V₁.

c₁ = 0.169 M · 2000 mL / 16.7 mL.

c₁(NaOH) = 20.23 M.

m(NaOH) = 20.23 mol · 40 g/ml.

m(NaOH) = 809.53 g.

The mass fraction is the ratio of one substance (in this example sodium hydroxide) with mass to the mass of the total mixture (solution).

Make proportion: m(NaOH) : m(solution) = 53.4 g : 100 g.

m(solution) = 1516 g in one liter of solution.

d(solution) = 1516 g/L = 1.52 g/mL.

4 0
3 years ago
Which acid has the largest ka.
lbvjy [14]

dissociation of proton from the acid depends upon the central atoms's electronegativity

More is the electronegativity of halogen ⇒ more is its pull on the oxygen ⇒ easier will the bond breakage of O-H ⇒ higher the acidity

In terms of E.N :

Cl > Br > I

so HClO₃ is highest acidity with the highest Ka value

7 0
4 years ago
Archeologist discovered a silver crown in an ancient tomb and sent it for analysis. You placed the crown in a tub of water and f
gulaghasi [49]

Answer:

Explanation:

The density of pure lead is 10.49g/cm³

Given parameters:

Volume of water displaced by the crown = 238.1ml

Mass of crown = 2.50kg

Solution

We would simply find the density of the discovered crown and compare with that of the standardized density of lead.

Density is an intensive property of matter and it is the same for any form of matter. It is amount of substance per unit volume:

               Density = \frac{mass}{volume}

We need to convert the given parameters to standard unit,

                                 1ml = 1cm³

         Therefore, the volume of water displaced is 238.1cm³

Also,

                       1kg  = 1000g

                       2.5kg = 2500g

    mass of the crown is 2500g

 

Density = \frac{2500}{238.1} = 10.49g/cm³

The crown is made of silver because the density matches with that of pure silver.

                       

8 0
3 years ago
Mechanism of Allan's with H2SO4, CH3CH2OH
lana66690 [7]
<span> that the reaction is preferably called an elimination, rather than a dehydration, although I personally like the term dehydration because it emphasizes the strong dehydrating power of H2SO4 that is unfotunately forgotten too often by undergraduates.   I like to think of it as H2SO4 has such a strong affinity for water that it literally pulls water molecules from organics.</span>
3 0
3 years ago
When does a real gas behave like an ideal gas?
kkurt [141]

At high temperatures and low pressures

5 0
4 years ago
Read 2 more answers
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