For each of the following compounds, write the symbols of the ions in the compound, and the number of each ion in the molecule of that compound.

cal2
na2co3
ga(cio3)3
cuf2
(nh4)3po4
feso4
mg(no3)2
nh4no2
kc2h3o2
na2cr2o7

Using the subscripts from the given molecule we can find the symbols of cations, anions as well as number of ions.

Explanation:

CaI₂  =  Ca²⁺ and 2I⁻ ions

Na₂CO₃ = 2 Na⁺ and 1 CO₃²⁻

Ga(ClO₃)₃  = Ga³⁺ and ClO₃⁻

CuF₂  = Cu²⁺ and 2 F⁻

(NH₄)₃PO₄  = 3 NH₄⁺ and PO₄³⁻

FeSO₄   = Fe²⁺ and SO₄²⁻

Mg(NO₃)₂ = Mg²⁺ and NO₃⁻

NH₄NO₂ = NH₄⁺ and NO₂⁻

KC₂H₃O₂= K⁺ and CH₃COO⁻

Na₂Cr₂O₇ = 2Na⁺ and Cr₂O₇²⁻

a chemical reaction happens

explanation:

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e