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Describe the structure of an alpha particle

An alpha particle is made up of two neutrons and two protons. It is the same as the nucleus of a helium atom.
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Answered by Alexandra M. • Physics tutor
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What is the difference between an exothermic and an endothermic reaction?

If a reaction is exothermic, it means that it gives out energy, heating up its surroundings, and so the products have less energy than the reactants. If a reaction is endothermic, it means that it takes in e...
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How can I tell if I should use the perfect of imperfect tense when talking about thing in the past?

In general, the imperfect tense is used for descriptions and ongoing\repeated actions in the past, for example: Description - It was raining: Il pleuvait Ongoing - I was reading my book: Je lisais mon livre ...
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Answered by Laura D. • French tutor
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In what way does the use of photographs within this article make us feel more persuaded to donate to the children's abuse charity?

The visual aids embedded within the text of this article allow us to connect faces to the descriptions of personal accounts given. This is effective in persuading us to donate because, we feel more of a pers...
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What is activation energy?

Activation energy is the amount of energy that the reactants need in order to react and become the products. For example, when burning natural gas (also called methane, or CH 4 ), you need a spark to light i...
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Answered by Oliver N. • Chemistry tutor
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