NIOS Class 10 Science & Tech — Flashcards for Quick Revision

A: Matter is anything that has mass and occupies space. The two defining properties are: 1) It has mass (weight) - the heavier an object, the more mass it has, and 2) It occupies space (has volume) - it

A: The term 'atom' was coined by the Greek philosopher Democritus. It comes from the Greek word 'atomos' meaning 'indivisible'. Democritus believed that matter is composed of tiny, indivisible particles

A: Water naturally exists in all three states: 1) Solid - Ice (frozen water), 2) Liquid - Water at room temperature, 3) Gas - Steam or water vapour. Water is the only substance that exists naturally in a

A: Yes, according to the Law of Constant Proportions. Pure calcium carbonate always contains the same elements in fixed proportions by mass (Ca:C:O = 40:12:48) regardless of its source - whether from mar

A: According to the Law of Conservation of Mass, mass is neither created nor destroyed. When magnesium burns, it combines with oxygen from air to form magnesium oxide (2Mg + O₂ → 2MgO). The increased mas

A: 32g of oxygen. This demonstrates the Law of Multiple Proportions. In CO: C:O = 12:16, in CO₂: C:O = 12:32. The ratio of oxygen masses (16:32 = 1:2) is a simple whole number ratio.