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What are the components of an atom and what are their properties?

An atoms is composed of a central NUCLEUS , with ELECTRONS occupying shells, moving around the nucleus. The nucleus is composed of PROTONS and NEUTRONS . The PROTON has a relative mass of 1 and a charge of +...
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Answered by Axel R. • Chemistry tutor
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What is an electron volt?

Electron volts, like joules, are a unit of energy. This may sound confusing- why two? But think of it this way; length has two possible units- metric (metres) and imperial (inches). We can use either units t...
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Answered by Nicholas M. • Physics tutor
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z = 3x + 5y, if x = 7 and z = 41, what is 2y?

z = 3x + 5y 41 = 3(7) +5y 41= 21 + 5y 20 = 5y 4 = y y = 4 2y = 8
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Answered by Hannah A. • Maths tutor
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How would you correctly carry out a flame test, and what colour would potassium yield, and what colour would lithium yield?

Answer First a wire loop is cleaned with diluted hydrochloric acid, which is then dipped into the sample metal or solution. This is then held over an open flame and the colour emitted is observed. The colour...
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How can I solve quadratic equations by completing the square?

When we have a quadratic (ax 2 + bx + c = 0) we can "complete the square" to solve for x. For example x 2 + 8x + 7 = 0. First look at the x 2 + 8x, in particular the coefficient of x, "b"...
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Answered by Thomas B. • Maths tutor
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