Question

in the double replacement reactions shown in the lab, what signs of a chemical reaction were demonstrated? * 4 points
select the two that apply.

a gas was produced
a precipitate was formed
light was given off
there was a color change
there was a temperature change

Explanation:

In a double - replacement reaction, common signs of a chemical reaction include the formation of a precipitate (when two aqueous solutions react and an insoluble solid forms) and the production of a gas (which can be observed as bubbles). A temperature change is more commonly associated with exothermic or endothermic reactions (not specific to double - replacement), a color change can occur in many types of reactions (not exclusive to double - replacement), and light being given off is more typical of combustion or some redox reactions (not characteristic of double - replacement).

Answer:

a precipitate was formed, a gas was produced