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Q: Give 2 advantages of using stents over CABG for coronary heart disease.

Less invasive, not as big an operation, therefore there is less risk involved.Shorter recovery time, and so patient spends less time in hospital.Could also be: Doesn't need to use general anaesthetic. Less s...
MS
Answered by Maria S. • Biology tutor
3931 Views

Explain why graphite conducts electricity. The answer should include structure and bonding of graphite.

Each carbon atom in graphite forms 3 covalent bonds, which means there is one delocalised electron per carbon atom. These delocalised electrons can move through graphite and carry charge.
MS
Answered by Maria S. • Chemistry tutor
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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.
MS
Answered by Maria S. • Chemistry tutor
5662 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, Substi...
KJ
Answered by Karen J. • Maths tutor
2963 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 particles present, ...
AH
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