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Whitepunk [10]
3 years ago
5

I have an experiment where I put a balloon into an ice bucket and measure its temperature but the lab says

Chemistry
1 answer:
Pavlova-9 [17]3 years ago
7 0
What does the lab say because then i can help :)

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What does Hess's law state can be done in order to be able to react solid magnesium with oxygen gas safely (that is, without exp
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Answer:

C. The reaction can be broken down and performed in steps

Explanation:

Hess's Law of Constant Heat Summation states that irrespective of the number of steps followed in a reaction, the total enthalpy change for the reaction is the sum of all enthalpy changes corresponding to all the steps in the overall reaction. The implication of this law is that  the change of enthalpy in a chemical reaction is independent of the pathway between the initial and final states of the system.

To obtain MgO safely without exposing magnesium to flame, the reaction sequence shown in the image attached may be carried out. Since the enthalpy of the overall reaction is independent of the pathway between the initial and final states of the system, the sum of the enthalpy of each step yields the enthalpy of formation of MgO.

3 0
2 years ago
Do centromeres divide at anaphase i or ii
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Anaphase 1 is when centromeres divide
7 0
3 years ago
Calculate the minimum concentration of Mg2+ that mustbe added to 0.10 M NaF in order to initiate a precipitate ofmagnesium fluor
blondinia [14]

Answer:

E. 6.9 E-7 M

Explanation:

  • NaF  →  Na+   +     F-

      0.10M   0.10M    0.10M

  • MgF2 ↔ Mg2+  +    2F-

eq:     S             S          2S + 0.1

∴ Ksp = 6.9 E-9 = [Mg2+][F-]² = (S)(2S+0.1)²

if we compared the concentration ( 0.1 M ) with the Ksp ( 6.9 E-9 ); then we can neglect the solubility as adding:

⇒ Ksp = 6.9 E-9 = (S)(0.1)² = 0.01S

⇒ S = 6.9 E-9 / 0.01 = 6.9 E-7 M

6 0
3 years ago
An atom of an element has two electrons in the first energy level and five electrons in the second energy level. Write the elect
alukav5142 [94]

Answer:

electronic configuration: 1s^2,2s^2,2p^3            

name: nitrogen

unpaired electron: 3

Explanation:

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State the hypothesis of continental drift.
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Wegener's idea that pangaea drifted into a continents
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