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Use the following equations to answer the next five questions:
i. H2O --> H2O
ii. Na+ + Cl- Ag+ + NO3- --> AgCl + Na+ + NO3-
iii. CH3OH + O2 --> CO2 + H2O
iv. 2H2O --> 2H2 + O2
v. H+ + OH- --> H2O
(a) Which equations describes a physical change?
(b) Which equation identifies the reactants and products of a combustion reaction?
(c) Which equation is not balanced?
(d) Which is a net ionic equation?

Respuesta :

laurahai

Answer:

(a) i

(b) iii

(c) iii

(d) v

Explanation:

(a) A physical change does not alter the identity of the substance. Here the water remains water, but may change undergo a physical change such as vaporization or freezing.

(b) A combustion reaction usually involves the exothermic reaction of oxygen with another molecule to form carbon dioxide and water

(c) The reaction may be balanced as follows: CH₃OH + 3/2O₂ ⇒ CO₂ + 2H₂O

(d) A net ionic equation only takes into account the species that underwent a chemical change. Equation ii. for example, is not a net ionic equation because the Na⁺ and NO₃⁻ did not change in any way.

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