Search our library of Chemistry GCSE questions

Top answers

Chemistry

GCSE

Reaction between a metal and acid gives?

Metal + Acid --> Metal salt + H2 (g)E.g. Cu + HCl --> CuCl2 + H2

Answered by Celine Iswarya P. • Chemistry tutor

2092 Views

The student did another experiment using 20 cm3 of sodium hydroxide solution with a concentration of 0.18 mol/dm3 . Relative formula mass (Mr) of NaOH = 40 Calculate the mass of sodium hydroxide in 20 cm3 of this solution.

Answer= 0.144gWorking out:mol= conc x volume (in dm^3)mass = mol x RFFSo,mol = 0.18 x (20/1000) = 0.0036molMass= 0.036 x 40 = 0.144g

Answered by Celine Iswarya P. • Chemistry tutor

13547 Views

Assuming 100% yield, calculate the maximum volume of ammonia that could be produced from 1200dm3 of hydrogen, measured at room temp and pressure.

Okay so first always write out the equation...N₂(g) + 3H₂(g) ⇌ 2NH₃(g)Now we need to ask ourselves what equations we know are relevant to the question. The question gives ...

Answered by Emma B. • Chemistry tutor

6554 Views

The student did another experiment using 20 cm3 of sodium hydroxide solution with a concentration of 0.18 mol/dm3 . Relative formula mass (Mr) of NaOH = 40 Calculate the mass of sodium hydroxide in 20 cm3 of this solution.

20/1000 *0.18
final answer 0.144 Answer must be explained in person. It is very difficult to explain in writing.

Answered by Saranya G. • Chemistry tutor

4403 Views

A compound is found to contain 3.1% Hydrogen, 65.3% Oxygen and 31.6% Phosphorus. Work out its empirical formula.

To answer this question, we need to know the relative number of atoms of each element present. This can be calculated by dividing the amount of an element present in the sample by the relative masses of t...

Answered by Adam B. • Chemistry tutor

5329 Views