A scientist carried out several different procedures, each of which caused a change in matter. Select each procedure that is likely a chemical change.
Salt crystals were crushed into a fine powder.
оос
Bubbles were produced when iron was placed in acid.
Two liquids were combined, and a solid appeared.
A piece of metal melted when it was heated.
OO
A white substance turned blue when water was added.
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Explanation is in the file

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i think a, hope it .

explanation:

answer: the enthalpy of the overall chemical reaction is +87.88 kj or +88 kj.

according to hess's law, the overall enthalpy of a reaction is the difference between the sum of enthalpy values of all the products and the sum of enthalpy values of all the reactants.

δh(reaction) = ∑nδh(products) - ∑nδh(reactants)

δh(reaction) = [δh +δh] - [δh]

δh(reaction) = [1(-287.02) + 1(0) ] - [1(-374.9)] kj = +87.88 kj

here, δh (pcl3) = -287.02 kj, δh(cl2) = 0, δh(pcl5) = -374.9 kj

therefore, enthalpy of the overall reaction is +87.88 kj or +88 kj.