Top answers

An unknown gas from a reaction is contained in a 2 litre beaker, at standard atmospheric pressure and a Temperature of 25 Celsius. Calculate the number of moles of the gas.

PV=nRT n=PV/RT=(1.01*10 5 0.002)/(8.31 298)=0.0816 moles
JM
Answered by James M. • Chemistry tutor
2095 Views

Define an isotope.

Compounds with the same molecular formula but have different structural formulas.
SS
Answered by Shivani S. • Chemistry tutor
3206 Views

Can you describe four variables which affect the rate of a chemical reaction and how they affect the rate?

Temperature: A higher temperature increases the rate of a reaction by increasing the number of particles with enough energy to take part in a reaction. 2) Particle size: The smaller the particle size the gre...
SS
Answered by Steven S. • Chemistry tutor
2730 Views

In the presence of ultraviolet radiation, cyclohexane reacts with bromine. A mixture of cyclic products are formed, including C6H11Br. Discuss each step of this reaction providing equations to show the mechanism.

INITIATION: Br 2 --> 2Br . The breaking of the Br 2 bond from ultraviolet radiation forms two radicals, as one electron from the bond pair goes to each bromine atom. This is called homolytic fission. PROP...
LK
Answered by Lisa K. • Chemistry tutor
19570 Views

State how you would test a solution for the presence of sulfate ions? Explain, using an ionic equation, what you would expect to observe in the presence of sulfate ions.

You would add barium chloride solution to the sample to be tested. Group II sulfate solubility decreases down the group - with barium sulfate being insoluble. We would expect to see a heavy white precipitate...
JD
Answered by Joshua D. • Chemistry tutor
14522 Views