When heated, calcium carbonate forms calcium oxide and carbon dioxide
The equation for the reaction is;
CaCO³⇒CaO+CO²
The relative atomic masses are Ar Ca=40,C=12,O=16
A student heated 25g of calcium carbonate.
What mass of carbon dioxide was produced
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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

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).