60 questions · Class 9 · CBSE
Explain the relationship between atoms, molecules, and compounds.
What are the main differences between elements and compounds?
Calculate the molecular mass of calcium carbonate (CaCO₃).
Find the number of moles in 44 g of carbon dioxide.
Calculate the molecular mass of ammonia (NH₃).
How many particles are present in 1 mole of any substance?
Calculate the number of moles in 18 g of water.
Find the formula unit mass of sodium chloride (NaCl).
Calculate the molecular mass of carbon dioxide (CO₂).
Calculate the molecular mass of water (H₂O).