Question

Use 2 Read the information in the box. sea Rock salt is a mixture of salt (sodium chloride) and rock. Salt is soluble in water. The rock is not soluble in water. 2 The W m Monja has five samples of rock salt. Each sample has a mass of 100 g. Monja asks a scientific questin Which sample contains most salt? She follows the stages below to answer her question. filter paper filter funnel flask She adds the ground rock salt to a large volume of warm water , and stirs. Monja grinds the rock salt sample in a pestle and mortar. She filters the mixture. a After filtering, what is in the flask? b After filtering, what remains in the filter paper? c Monja finds the mass of waste material on the filter paper from each sample. She records her results in a table. i Which sample contains the most waste? Rock salt Mass of waste materia sample on filter paper (9) A 20 ii Which sample contains the most salt? B 36 C 44 iii What mass of salt is in sample A? D 17 E 22 56.​

Answer 1

Explanation:

Twenty caravans are travelling across the desert one day apart. The first carvan reached the oasis and the camels drank half of the water in the pool. On the second day, the second carvan reached the oasis and the camels drank one-third of the water that was left. On the third day, the camels in the third carvan drank one- quarter of the water that was left. On the first day the pool contained 1050m3 of water. How much water was left after the 20th carvan passed through. Hint: Observe the pattern and calculate.