Question

Выберите две пары реакций, которые относятся к реакциям разложения и обмена соответственно 2HgO = 2Hg + O2 и Na2CO3 + 2AgNO3 = Ag2CO3 + 2NaNO3 Fe + 2HBr = FeBr2 + H2 и P2O5 + 3H2O = 2H3PO4 Mg + SiO2 = Si + 2MgO и 2Al + Cr2O3 = Al2O3 + 2Cr KBrO4 = KBr + 2O2 и Na2SO4 + CaCl2 = CaSO4 + 2NaCl 2P + 5Cl2 = 2PCl5 и Ca(NO3)2 + Na2CO3 = CaCO3 + 2NaNO3

Answer 1

Ответ:

Реакции обмена :

2HgO → 2Hg+O2

KBrO4 → KBr+2O2

Реакции обмена :

Na2CO3+2AgNO3 → Ag2CO3+2NaNO3

Na2SO4 + CaCl2 → CaSO4 + 2NaCl

Ca(NO3)2 + Na2CO3 → CaCO3 + 2NaNO3

Answer 2

Reactions of Decomposition and Exchange

The given options are:

1. 2HgO → 2Hg + O2 2. Na2CO3 + 2AgNO3 → Ag2CO3 + 2NaNO3 3. Fe + 2HBr → FeBr2 + H2 4. P2O5 + 3H2O → 2H3PO4 5. Mg + SiO2 → Si + 2MgO 6. 2Al + Cr2O3 → Al2O3 + 2Cr 7. KBrO4 → KBr + 2O2 8. Na2SO4 + CaCl2 → CaSO4 + 2NaCl 9. 2P + 5Cl2 → 2PCl5 10. Ca(NO3)2 + Na2CO3 → CaCO3 + 2NaNO3

Let's analyze the given pairs of reactions and determine which ones are related to decomposition and exchange reactions.

Pair 1: 2HgO → 2Hg + O2 This is an example of a decomposition reaction, where a compound (in this case, mercury(II) oxide) breaks down into its constituent elements (mercury and oxygen gas). The reaction is as follows: 2HgO → 2Hg + O2 [[1]]

Pair 2: Na2CO3 + 2AgNO3 → Ag2CO3 + 2NaNO3 This is an example of an exchange reaction, also known as a double displacement reaction. In this reaction, the cations and anions of two compounds switch places to form two new compounds. The reaction is as follows: Na2CO3 + 2AgNO3 → Ag2CO3 + 2NaNO3 [[2]]

Therefore, the pairs of reactions that correspond to decomposition and exchange reactions, respectively, are: 1. 2HgO → 2Hg + O2 (decomposition reaction) 2. Na2CO3 + 2AgNO3 → Ag2CO3 + 2NaNO3 (exchange reaction)

I hope this helps! Let me know if you have any further questions.