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Naddik [55]
3 years ago
14

Which of the following is a part of the heliocentric model? All objects in space move around Earth in perfect circles. All objec

ts in space move around the sun. All objects in space move in parallel tracks. All objects in space are perfect spheres.
Chemistry
2 answers:
Viefleur [7K]3 years ago
5 0
The Heliocentric system is a model whereby the sun is assumed to be in the middle of the solar system and all the other objects including the Earth move or revolve around it.This method opposed the earlier model of Geocentrism which proposed that the Earth was lying at the centre and all the other objects revolved around it.
pentagon [3]3 years ago
5 0

Answer:

B is the answer your looking for

hope it helps :)

Explanation:

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Which equation represents the correct net ionic equation for the reaction between Ca(OH)2 and H2SO4?
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<u>Answer:</u> The correct net ionic equation for the reaction is 2H^{+}(aq)+2OH^{-}(aq)\rightarrow 2H_2O(l)

<u>Explanation:</u>

Net ionic equation is defined as the equations in which spectator ions are not included.

Spectator ions are the ones that are present equally on the reactant and product sides. They do not participate in the reaction.  

The balanced molecular equation is:

Ca(OH)_2(aq)+H_2SO_4(aq)\rightarrow CaSO_4(aq)+2H_2O(l)

The complete ionic equation follows:

Ca^{2+}(aq)+2OH^-(aq)+2H^+(aq)+SO_4^{2-}(aq)\rightarrow 2Ca^{2+}(aq)+SO_4^{2-}(aq)+H_2O(l)

As calcium and sulfate ions are present on both sides of the reaction. Thus, they are considered spectator ions.

The net ionic equation follows:

2H^{+}(aq)+2OH^{-}(aq)\rightarrow 2H_2O(l)

Hence, the correct net ionic equation for the reaction is 2H^{+}(aq)+2OH^{-}(aq)\rightarrow 2H_2O(l)

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