Calcium reacts with water according to the chemical equation below:
Ca + 2H2O--> Ca(OH)2 + H2
All but which reaction is expected to occur on the basis of the reaction of calcium and water?
I don't think you've typed all of the question.
To determine which reactions are expected to occur based on the reaction of calcium and water, we need to understand the different types of chemical reactions. The main types of chemical reactions are:
1. Combination reaction (also known as synthesis): Two or more reactants combine to form a single product. Example: A + B → AB
2. Decomposition reaction: A single compound breaks down into two or more simpler substances. Example: AB → A + B
3. Displacement reaction (also known as single replacement): An element displaces another element in a compound. Example: A + BC → AC + B
4. Double displacement reaction (also known as double replacement): The positive ions of two compounds exchange places. Example: AB + CD → AD + CB
5. Combustion reaction: A substance reacts with oxygen to produce heat and light. Example: CxHy + O2 → CO2 + H2O
Looking at the given chemical equation: Ca + 2H2O --> Ca(OH)2 + H2
It represents a displacement reaction because calcium (Ca) displaces hydrogen (H) in water (H2O) to form calcium hydroxide (Ca(OH)2) and hydrogen gas (H2).
Therefore, the expected reactions based on the reaction of calcium and water are:
- Combination reaction (Ca + O2 → CaO)
- Decomposition reaction (Ca(OH)2 → CaO + H2O)
- Displacement reaction (Ca + 2HCl → CaCl2 + H2)
- Double displacement reaction (Ca(OH)2 + 2HCl → CaCl2 + 2H2O)
The reaction that is not expected to occur based on the given reaction of calcium and water is a combustion reaction.