What is the concentration (in mol dm3) of a solution containing 28 g of potassium hydroxide per 100 cm3 of solution? (K=39; H=1; 0=16)

Chlorine is used in water purification because it

The number of hydrogen ions in 1.0dm6.00x103 of a 0.25 mole dm6.00x10-3 tetraoxosulphate(Vl) acid solution is [Avogadro constant = 6.0 x 1 0]

Which statement is NOT true about the composition of starch?

B is an isotope of the element \(^{238} _{92}Ur\). The isotope B has

A calcium atom and a calcium ion have the same

The boiling point of water is higher than the boiling point of ethanol because

The reaction C2H6 → C2H + H2 is known as

Which is NOT a synthetic polymer?