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Use the periodic table to write symbols for the following species: 19 protons, 20 neutrons, 19 electrons

when looking at an atom on the periodic table, we see that within the box are two numbers: one at the top and one at the bottom. the top number represents the atomic number and the bottom number represents t...
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Answered by Alisha I. • Chemistry tutor
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Explain what oxidation and reduction means in terms of electrons.

The oxidation of a species, in terms of electrons, is when the species loses electrons. The reduction of a species, on another hand, is when the species gains electrons in a reaction.
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Answered by Ishaan A. • Chemistry tutor
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25cm3 of a 0.10moldm-3 solution of sodium hydroxide reacts exactly in a titration with 15cm3 HCl. What is the concentration of the hydrochloric acid?

First, write a balanced chemical equation to determine the ratio of the reacting species: NaOH + HCl --> NaCl + H 2 O Sodium hydroxide and hydrochloric acid react in a 1:1 ratio, so the number of moles of...
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Compare the basic ability between ammonia, ethyl amine and phenyl amine.

In terms of order of increasing basic ability, it is as follows. Phenylamine < ammonia < ethyl amine. The reason why phenyl amine (containing a benzene ring) is a weaker base than ammonia is because th...
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Explain how nucleophilic substitution for a haloalkane actually occurs?

In a haloalkane, not all of the bonds are the same. We have to consider the fact that the halogen atom (for instance a bromine atom) is more electronegative than either carbon or hydrogen atoms, and has a te...
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Answered by Naman K. • Chemistry tutor
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