Chem Rxns: 18 flashcards
All 18 flashcards from this kit, free and with no sign-up.
1. What is a chemical reaction?
Show the answer
A process where one or more substances (reactants) are converted into one or more different substances (products).
2. What are the three main ways to represent a chemical reaction?
Show the answer
Word equation, skeletal chemical equation, and balanced chemical equation.
3. In a chemical equation, what do the symbols (s), (l), (g), and (aq) stand for?
Show the answer
(s) solid, (l) liquid, (g) gas, (aq) aqueous solution.
4. What is the law of conservation of mass?
Show the answer
Mass can neither be created nor destroyed in a chemical reaction; total mass of reactants equals total mass of products.
5. Why must a chemical equation be balanced?
Show the answer
To obey the law of conservation of mass, ensuring the same number of atoms of each element on both sides.
6. What is a balanced chemical equation?
Show the answer
An equation where the number of atoms of each element is equal on both the reactant and product sides.
7. What is a combination reaction? Give an example.
Show the answer
A reaction where two or more substances combine to form a single product. Example: CaO(s) + H₂O(l) → Ca(OH)₂(aq).
8. What is a decomposition reaction? Give an example.
Show the answer
A reaction where a single compound breaks down into two or more simpler substances. Example: 2H₂O(l) → 2H₂(g) + O₂(g) (electrolysis).
9. What is a displacement reaction? Give an example.
Show the answer
A reaction where a more reactive element displaces a less reactive element from its compound. Example: Fe(s) + CuSO₄(aq) → FeSO₄(aq) + Cu(s).
10. What is a double displacement reaction? Give an example.
Show the answer
A reaction where two compounds exchange ions to form two new compounds. Example: Na₂SO₄(aq) + BaCl₂(aq) → BaSO₄(s) + 2NaCl(aq).
11. What is a redox reaction?
Show the answer
A reaction where oxidation (loss of electrons) and reduction (gain of electrons) occur simultaneously.
12. In the reaction ZnO + C → Zn + CO, which substance is oxidized and which is reduced?
Show the answer
Carbon (C) is oxidized (gains oxygen), and zinc oxide (ZnO) is reduced (loses oxygen).
13. What is an exothermic reaction? Give an example.
Show the answer
A reaction that releases heat energy. Example: CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(g) (combustion of methane).
14. What is an endothermic reaction? Give an example.
Show the answer
A reaction that absorbs heat energy. Example: CaCO₃(s) → CaO(s) + CO₂(g) (thermal decomposition).
15. What is a precipitation reaction?
Show the answer
A reaction in which an insoluble solid (precipitate) is formed when two solutions are mixed. Example: BaSO₄ precipitate in the double displacement reaction.
16. What is a catalyst?
Show the answer
A substance that speeds up a chemical reaction without being consumed in the reaction.
17. What is the role of a catalyst in a reaction?
Show the answer
It lowers the activation energy and increases the rate of reaction without being used up.
18. What is a corrosion reaction? Give an example.
Show the answer
The gradual destruction of a metal due to reaction with moisture, air, or chemicals. Example: Rusting of iron (Fe₂O₃·xH₂O).
Your notes can be a kit like these
Every kit here was made from real study material. Point Veda at a chapter, a PDF, a photo or a link and get notes, flashcards, practice MCQs, games and a scored test — free, in 42 languages.
- Chapter notes
- Flashcards
- Practice MCQs
- Scored tests
- Exam prep
Get Veda free See what students get
Free to start · No ads · Works in 42 languages