10th - 12th grade
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A mixture contains equal volumes of two liquids. Liquid S has a boiling point of 80oC and liquid T has a boiling point of 54oC.
What is the composition of the first distillate?
In an experiment, a student needs to measure 36.50 cm3 of liquid.
Which apparatus would measure this volume most accurately?
Which method can be used to obtain water from copper(II) sulfate solution?
Which method can be used to obtain copper(II) sulfate crystals from its solution?
Which one represents an ion?
What is missing from the equation below?
acid + alkali --> salt + ...........
Element X forms a basic oxide.
What is X?
Which is a property of all metals?
A coal-burning heater is inefficient and badly sealed. The limestone walls are near the heater and being worn away.
Which gas, escaping from the heater, causes the walls to be worn away?