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3 years ago

Which statement describes the roles of photosynthesis and respiration in the oxygen cycle?

Chemistry

2 answers:

ASHA 777 [7]3 years ago

8 0

Respiration and photosynthesis both remove oxygen from the atmosphere

zalisa [80]3 years ago

5 0

Respiration removes oxygen from the atmosphere, and photosynthesis puts oxygen into the atmosphere.

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What material often called a shooting stars as it enters the Earth’s atmosphere

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What would be a comet

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What type of reaction will occur when lead nitrate is mixed with the potassium iodide solution?

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Pb(NO3)2 + 2KI ---> PbI2↓ + 2KNO3

the precipitation reaction

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Electrons attract objects and pull toward

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4 years ago

Use Coulomb's Law to calculate the energy of a copper ion and an oxide ion at their equilibrium ion-pair separation distance.

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3 years ago

When the following solutions are mixed together, what precipitate (if any) will form? a. FeSO4(aq) 1 KCl(aq) b. Al(NO3)3(aq) 1 B

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Answer: Precipitates form only in (b) (c) and (d) and these are $Al(OH)_3$ , $CaSO_4$ and NiS respectively.

Explanation: (a) The reaction will be:

$FeSO_4(aq)+2KCl(aq)\rightarrow FeCl_2(aq)+K_2SO_4(aq)$

The reaction will not take place as both the products are soluble and so no precipitate will form.

(b) The reaction will be:

$2Al(NO_3)_3(aq)+3Ba(OH)_2(aq)\rightarrow 3Ba(NO_3)_2(aq)+2Al(OH)_3(s)$

This reaction will take place as aluminum hydroxide is insoluble. So, the precipitate formed in this reaction is $Al(OH)_3$ .

$CaCl_2(aq)+Na_2SO_4(aq)\rightarrow 2NaCl(aq)+CaSO_4(s)$

This reaction will take place as a precipitate of calcium sulfate(slightly soluble) will form.

(d) The reaction will be:

$K_2S(aq)+Ni(NO_3)_2(aq)\rightarrow 2KNO_3(aq)+NiS(s)$

This reaction will take place as NiS is insoluble. So, the precipitate formed in this reaction is NiS.

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3 years ago

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