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IgorLugansk [536]
3 years ago
15

Which of these is an example of a physical change?

Chemistry
2 answers:
miv72 [106K]3 years ago
7 0
Sugar dissolving in warm water because when the sugar dissolves you can get the sugar back by letting the water evaporate.,
kondor19780726 [428]3 years ago
5 0

Answer:

A

Explanation:

Sugar desolving in warm water

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Find the volume of 0.100M hydrochloric acid necessary to react completely with 1.51g Al(OH)3.
shtirl [24]
Reaction equation:
Al(OH)₃ + 3HCl → AlCl₃ + 3H₂O
Moles of Al(OH)₃:
moles = mass/Mr
= 1.51 / (27 + 17 x 3)
= 0.019
Molar ratio Al(OH)₃ : HCl = 1 : 3
Moles of HCl required = 0.019 x 3
=0.057
concentration = moles/volume
volume = 0.057 / 0.1
= 0.57 dm³
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3 years ago
First to answer both CORRECTLY gets brainleist!
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The following thermochemical equation is for the reaction of Fe 3 O 4 (s) with hydrogen (g) to form iron and water vapor Fe 3 O
Mila [183]

Answer:

41.3kJ of heat is absorbed

Explanation:

Based in the reaction:

Fe₃O₄(s) + 4H₂(g) → 3Fe(s) + 4H₂O(g) ΔH = 151kJ

<em>1 mole of Fe3O4 reacts with 4 moles of H₂, 151kJ are absorbed.</em>

63.4g of Fe₃O₄ (Molar mass: 231.533g/mol) are:

63.4g Fe₃O₄ × (1mol / 231.533g) = <em>0.274moles of Fe₃O₄</em>

These are the moles of Fe₃O₄ that react. As 1 mole of Fe₃O₄ in reaction absorb 151kJ, 0.274moles absorb:

0.274moles of Fe₃O₄ × (151kJ / 1 mole Fe₃O₄) =

<h3>41.3kJ of heat is absorbed</h3>

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6 0
3 years ago
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Arte-miy333 [17]

Answer:

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Explanation:

If this isnt what your looking for let me know, there wasnt alot of context.

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natta225 [31]
Delta waves are associated with a deep sleep~
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