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State the relative charge and relative mass of a proton, of a neutron and of an electron. In terms of particles, explain the relationship between two isotopes of the same element. Explain why these isotopes have identical chemical properties.

Proton: Relative Mass = 1, Relative Charge = +1Neutron: Relative Mass = 1, Relative Charge = 0Electron: Relative Mass = ~1/1870, Relative Charge = -1 Isotopes vary in the number of neutrons and therefore var...
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Answered by Edward P. • Chemistry tutor
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Explain the physical properties of graphite in terms of its structure and bonding

Graphite is a giant covalent molecule . This means it has many atoms joined together by covalent bonds. Graphite consists of layers of carbon atoms joined together by covalent bonds with delocalised electron...
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Answered by Eliza D. • Chemistry tutor
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Edexcel November 2016 1H Maths. Q27

The sphere has radius 6 cm. The solid cylinder has a base radius of 3cm and a height of h cm. The total surface area of the cylinder is twice the total surface area of the sphere. Work out the ratio of the v...
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Answered by Josh V. • Maths tutor
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Some poisons work by interfering with synaptic transmission at a neuromuscular junction. Describe the events at a synapse which lead to an action potential.

Across a membrane, there is a voltage at rest and this is known as the resting potential. This is deermined by the membrane permeability to different ions ie which ion channels are open at rest, and also by ...
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Answered by Leena C. • Biology tutor
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What is the difference between the verbs 'ser' and 'estar'?

The verbs ser and estar both translate as 'to be'. Its important to learn the differences between them. Ser is used to talk about permanent attributes. A useful tool to remember exactly when we need to use s...
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Answered by Louisa H. • Spanish tutor
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