Chemistry
With reference to a chemical equation, state which of the statements 1 to 5 pertain to A or B.
A : Information provided by a chemical equation.
B : Limitations of a chemical equation
- The nature of the individual elements.
- The speed of the reaction.
- The state of matter in which the substance is present.
- The completion of the reaction.
- The direction of the reaction.
Related Questions
Match the names of ions and radicals from 1 to 10 with their correct answer from A to Q.
A: Hg2+ B: MnO41- C: Sn4+ D: Pb2+ E: Sn2+ F: Pb4+ G: SO32- H: N3- I: NO21- J: MnO42- K: Hg1+ L: SO42- M: ClO1- N: ZnO22- O: Cr2O72- P: CrO42- Q: ClO31- 1. Hypochlorite 2. Permanganate 3. Plumbous 4. Zincate 5. Nitride 6. Mercuric 7. Stannic 8. Nitrite 9. Sulphite 10. Dichromate State which of the following formulas of compounds A to J are incorrect. If incorrect write the correct formula.
A: (NH4)3SO4 B: NaZnO2 C: KCr2O7 D: NaCO3 E: Ca2(PO4)3 F: Mg(SO4)2 G: KNO3 H: NaClO I: NaO J: BaCl2 Fill in the blanks with the correct word from the words in brackets :
- A symbol represents a short form of a/an …………… [atom/element/molecule]
- Compounds are always …………… [heterogeneous/homogeneous] in nature.
- Variable valency is exhibited, since electrons are lost from an element from the …………… [valence/penultimate] shell.
- A chemical equation is a shorthand form for a …………… [physical/chemical] change.
- Relative molecular mass of an element/compound is the number of times one …………… of the substance is heavier than -1⁄12th the mass of an atom of carbon [C12]. [atom/ion/molecule]
Underline the compound in each equation given below, which is incorrectly balanced and write the correct balancing for the same.
- Na2SO3 + HCl ⟶ 2NaCl + H2O + SO2
- CaC2 + N2 ⟶ 2CaCN2 + C
- Fe2O3 + 2H2 ⟶ 2Fe + 3H2O
- Cl2 + 2H2O + SO2 ⟶ 4HCl + H2SO4
- 6NaOH + 3Cl2 ⟶ 6NaCl + NaClO3 + 3H2O
- C2H5OH + 3O2 ⟶ 2CO2 + 2H2O
- NaOH + CO2 ⟶ Na2CO3 + H2O
- 2H2O + 2Cl2 ⟶ 2HCl + O2
- 3CuO + NH3 ⟶ 3Cu + 3H2O + N2
- PbO2 + 4HCl ⟶ PbCl2 + H2O + Cl2