NIC Cosmetology Written (Theory) ExamScientific ConceptsMedium
Which of the following chemical reactions involves the combination of two or more substances to form a more complex substance?
- ADecomposition reaction
- BSingle displacement reaction
- CSynthesis reaction
- DCombustion reaction
Show answer & explanationAnswer & explanation
Correct answer: C. Synthesis reaction
A synthesis reaction, also known as a combination reaction, is characterized by two or more simple substances combining to form a more complex product. This is fundamental to understanding how new compounds are formed in chemistry.
Why the other options are wrong
- A. A decomposition reaction involves a complex substance breaking down into two or more simpler substances, which is the opposite of the scenario described.
- B. A single displacement reaction involves one element replacing another element in a compound.
- D. A combustion reaction is a type of chemical reaction where a compound and an oxidant react, usually exothermically, producing heat and light; it's not simply about forming a more complex substance from simpler ones.
Synthesis Reaction
A chemical reaction in which two or more reactants combine to form a single, more complex product.
- Also called a combination reaction.
- General form: A + B → AB.
- Essential for creating new compounds.
Memory trick: Reactions are 'Dynamic' – 'Split', 'Combine', or 'Swap'!