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If an element has an atomic mass of 19 and a proton number of 9, how many neutrons does it have and how many electrons does it have?

The atomic mass is made up of all the protons and neutrons (which together form the nucleus) which each have a mass of approx. 1g. Therefore if the mass of the element is 19g and it has 9 protons (proton num...
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Answered by Jay T. • Chemistry tutor
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Calcium carbonate is burnt substance B is created. What is the formula for substance B and what is the equation when water is added?

Cao Cao + H20 --> Ca(OH)2
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Answered by Thomas N. • Chemistry tutor
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Explain briefly how instantaneous dipole - induced dipole bonds form.

(ASSISTED WITH DIAGRAMS) The electrons of a molecule are constantly moving around it in charge clouds, meaning that at any one point in time, the molecule's electrons could be more likely on one side than th...
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Answered by Bethany R. • Chemistry tutor
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Calculate the mass of the following substance: a) 2.5 x 10^23 molecules of N2

Avogrado's constant = 6.02214086 × 10 23 mol -1 2.5/6.02=0.415 Ar of N = 14 Mr of N2 = 28 28 x 0.415=11.62
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Answered by Kishan P. • Chemistry tutor
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How do I balance redox equations in acidic reactions, without trial and error, using half equations?

Here is a summary on the steps to complete these question types. Determin oxidation numbers 2. Figure out what is being oxidised and what is being reduced. 3. Write half equations. 4. Balance the atoms exclu...
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Answered by Imaany K. • Chemistry tutor
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