Chemistry

1Zinc is not regarded as a transition metal because

2In the Contact process, the catalyst used is vanadium(V) ___.

330 cm³ of gas was collected in 40 s. Find the average rate of reaction.

4How long must a current of 2 A flow to deposit 0.01 mol of silver? (F = 96,500 C)

5After 32 hours, 1/16 of a radioactive sample remains. What is its half-life?

6An example of a heavy metal pollutant is

7Ethene reacts with hydrogen in the presence of nickel to form

8The bond angle in methane is

9The pH of 0.1 mol/dm³ sodium ethanoate solution is

10The method used to make a soluble salt from two soluble reactants (acid and alkali) is ___.