Page 9 - Fizzy Science Corner

Chemistry

1. What is the name of the scientist who stated that matter can be converted into energy? ​– Einstein
2. The isotopes of chlorine with mass number 35 and 37 exist in which ratio? ​– 3 : 1
3. A gas is found to have the formula (CO)n. Its vapour density is 70. What must the value of n be?​ – 5
4. Which law directly explains the law of conservation of mass? – Avogadro’s law
5. To whom the credit for the discovery of transuranic element goes? ​– Seaborg
6. How many moles are there is 140 g of Si (atomic mass of silicon is 28)?​ – 5
7. Which substance does not have a melting point? – Glass
8. By which a mixture of sand and naphthalene can be separated? – sublimation
9. An element X forms an oxide X03. What is the valency of X? ​– 6
10. Sodium carbonate crystals lose water molecules. What is this property called? ​– Efflorescence
11. By whom was the law of constant proportions enunciated? –​ Proust