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saw5 [17]
3 years ago
9

BRAINLIESTTT ASAP!! PLEASE HELP ME :))

Chemistry
1 answer:
VLD [36.1K]3 years ago
7 0

Answer:

A - thinking of various research topics

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Which one of the following species is diamagnetic: a. F b. Zn2+ C. Cu2+ d. Ca+​
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The correct answer to this question is C

Explanation:

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N each reaction box, place the best reagent or reactant from the list below. reagents may be used more than once or not at all.
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See explaination

Explanation:

See attachment for the drawing of the intermediate products b and c (both are neutral; omit byproducts).

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The atoms, molecules, or compounds present at the start of a chemical reaction that participate in the reaction.
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For the first one the answer is B. and the second one is D.
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In what way does a temporary magnet provide an advantage over a permanent magnet?
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If 8.00 g NH4NO3 is dissolved in 1000 g of water, the water decreases in temperature from 21.00 degrees Celsius to 20.39 degrees
telo118 [61]

Answer:

25.7 kJ/mol

Explanation:

There are two heats involved.

heat of solution of NH₄NO₃ + heat from water = 0

q₁  +  q₂  =  0

n  =  moles of NH₄NO₃  =  8.00 g NH₄NO₃  ×  1 mol NH₄NO₃/80.0 g NH₄NO₃          

∴ n =   0.100 mol NH₄NO₃

q₁ = n * ΔHsoln = 0.100 mol * ΔHsoln

m  =  mass of solution  =  1000.0 g + 8.00 g  =  1008.0 g

q₂  =  mcΔT  = 58.0 g  ×  4.184 J°C⁻¹  g⁻¹  × ((20.39-21)°C) = -2570.19 J

q₁  +  q₂  =  0.100 mol  ×ΔHsoln  – 2570.19 J  =  0

ΔHsoln  =  +2570.19 J  /0.100 mol  =  +25702 J/mol  =  +25.7 kJ/mol

7 0
3 years ago
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