Fertiliser washed into a lake causes algae to grow rapidly and then die. Bacteria in the water then decompose the large amount of dead algae. How does the a...

use property A as a fuel it burns, releasing energy B as a solvent it is insoluble in water C as a fuel it does not burn D in car batteries it is a strong ac...

A solid catalyst works at its surface. A student is told that a catalyst is more effective when it is spread out as a fine powder rather than used as a singl...

When an atom loses one or more electrons during ionic bonding, it forms a charged particle. A student is asked to name this type of particle. What is the cor...

A student writes that in every exothermic reaction the reactants must be at a higher energy level than the products. The energy profile shown supports this i...

Potassium manganate(VII) forms an intensely purple solution in water. The colour is due to the manganese ion present. The formation of a strongly coloured co...

Krypton and xenon are used to fill some very bright car headlamps and photographic flash lamps, where the gas becomes extremely hot. This use is possible mai...

Row Acid Salt formed 1 hydrochloric acid nitrate 2 sulfuric acid sulfate 3 nitric acid chloride 4 hydrochloric acid sulfate A salt is named after the acid fr...

Some substances are made of separate atoms rather than molecules. Which of the following substances exists as single, unbonded atoms at room temperature?