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Vaselesa [24]
2 years ago
14

In order for matter or energy to be conserved, one must have a ____ system.

Chemistry
2 answers:
Oliga [24]2 years ago
7 0

Answer:

B. closed

Explanation:

In an open system both matter and energy is exchanged with the surroundings. Thus option A is incorrect.  

In a closed system, matter is not transferred but energy is exchanged. Option B is correct.

Isolated system does not allow the exchange of matter or energy.

Options C and D are incorrect as there are no systems in thermodynamics called unique and stationary.  

Leya [2.2K]2 years ago
6 0
Closed system.  If the system is not closed, matter or energy can escape from the system.  an example of this is if you react magnesium and hydrochloric acid in a open system.  The H₂ gas is going to escape making it look like some of the mass disappeared .  in that same reaction some in an open system will also loose heat to the surrounding which will make it look like less heat was produced.
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Based on the periodic table, what do we now call the element mendeleev called eka-manganese?
myrzilka [38]
Based on the periodic table, the element mendeleev called eka-manganese is now called technetium. Technetium<span> is a silvery-gray metal that tarnishes slowly in moist air. Hope this answers the question. Have a nice day. Feel free to ask more questions.</span>
8 0
3 years ago
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How many liters of O2 at 298 K and 1.00 bar are produced in 1.50 hr in an electrolytic cell operating at a current of 0.0200 A?
stellarik [79]

Answer: 0.0069L

Explanation:

2H2O(l) ---->O2(g) + 4H+(aq) + 4e-

no of moles= it/eF

NO of moles of O2 produced = (Current in Ampere x Time in second)/ (Faraday constant x Number of electrons required)

Moles of O2 produced = (0.02x (60 x 60X1.5 s)/(96485 x 4)

= 0.0002798 moles= 2.798x 10 ^-4moles

Using  ideal gas equation,

P V = n R T

Where, P is the pressure,

V is the volume,

n is the number of moles,

R is the gas constant, and T is the temperature

We have, 1 bar = 0.986923 atm

Substituting the values,

V = nRT/P = (2.798 x 10-4moles x 0.08205 L atm mol K x 298 K)/ 0.986923 atm = 0.0069L

Volume of O2 produced = 0.0069L

7 0
3 years ago
What is a zero order reaction? Give two examples.
dezoksy [38]

Answer:

I guess 3 to be honest and that's what I think

4 0
3 years ago
Determine whether the given compound name or formula contains a polyatomic ion. N H 4 C l Choose... Magnesium sulfate Choose...
Morgarella [4.7K]

Answer:

NH₄Cl, Magnesium sulfate, KCN

Explanation:

Determine whether the given compound name or formula contains a polyatomic ion.

  • NH₄Cl. YES. It contains the polyatomic ion ammonium NH₄⁺.
  • Magnesium sulfate. YES.  It contains the polyatomic ion sulfate SO₄²⁻.
  • Sodium phosphide Na₃P. NO.
  • SO₃. NO.
  • Calcium hydroxide Ca(OH)₂. NO.
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4 0
2 years ago
Write the nuclear equation for the beta decay<br> of calcium-45.
TiliK225 [7]

Answer:

on https://www.ck12.org/book/peoples-physics-concepts/section/20.1/

Explanation:

it shows for calcium 45 and maybe a possible equation on 3/4th's scroll down?

6 0
3 years ago
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