Contents
Balanced Chemical Equation – Solution
2Ca + O2 → 2CaO
The coefficients show the number of particles (atoms or molecules), and the indices show the number of atoms that make up the molecule. New substances are formed as a result of the rearrangement of the original atoms. As a result of a chemical reaction, atoms of chemical elements do not disappear anywhere and new ones do not appear, their number remains unchanged – this follows from the law of conservation of mass of substances.
Chemical Reaction Information
Calcium + Dioxygen = Calcium Oxide
This is an oxidation-reduction (redox) reaction. Ca is a reducing agent, O2 is an oxidizing agent.
- 2 Ca0 – 4 e– → 2 CaII (oxidation)
- 2 O0 + 4 e– → 2 O-II (reduction)
Reaction Type
Synthesis
Substances that react are called starting materials or reactants. The substances that form as a result are called reaction products.
Reactants:
Ca
- Names: Calcium.
- Appearance: Silvery-white-to-grey powder.
O2
- Names: Dioxygen, Oxygen.
- Appearance: Odourless compressed gas.
Products:
CaO – Calcium oxide
- Other names: Quicklime.
- Appearance: White to pale yellow/brown powder.
Similar Examples of Equalizing a Chemical Reaction
| O2 + Ca → Ca2O3 |
| O2 + Ca → Ca2O2 |
| H2O + O2 + Ca → H2 + Ca(OH)2 |
| O2 + H2 + Ca → Ca(OH)2 |
| O2 + Ca → CaO |
| O2 + P + Ca → CaPO4 |
| O2 + Ca → Ca2O |
| O2 + Ca → CaO2 |
| O2 + Ca → Ca8O4 |
