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The halogens are elements in Group 7. Bromide is in Group 7. How many electrons are there in the outer shell of a bromine atom? (1 mark)

7 electrons.

4914 Views

Solve these simultaneous equations (1) 12x + 3.5y = 32 (2) 8x + 3y = 24

Make the like terms equate by multiplying (1)*2 and (2)*3, ((1)*2) 24x+7y=64, ((2)*3) 24x+9y=72, Take one away from the other to remove the x term and solve for y, (24x+9y=72) - (24x+7y=64), 2y=8 y=4, Su...

Answered by Karen J. • Maths tutor

2645 Views

Using collision theory, explain why increasing the concentration of a reactant increases the rate of reaction.

Chemical reactions occur when reacting particles collide with energy equal to or greater than the activation energy. By increasing the concentration of reactants, there are more reacting particl...

Answered by Alexandra H. • Chemistry tutor

13814 Views

Describe the process of diffusion with an example.

Diffusion is the moving of solutes from a region of higher solute concentration to a region of low solute concentration. It does not require energy so we say it is a “passive process” and it can occur it ...

Answered by Emmanouella X. • Biology tutor

3184 Views

How should I structure an essay answer?

A clear introduction with a thesis statement (an answer to the question or a response to the task) and a well defined structure,Logically structured body...

Answered by Miruna I. • English tutor

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