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Define a gene

The basic unit of genetic material inherited from our parents - it is a short section of DNA. 

AG
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Define the standard enthalpy of formation

The standard enthalpy of formation of a substance is the enthalpy change when one mole of that substance is formed from the most stable allotropes of its elements in their standard states...

AG
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Name two types of chemical bonds and describe each type in terms of their bonding structure and properties

Ionic Bonding 

Ionic bonding occurs between positive ions (cations) and negative ions (anions), which are attracted to each other through their oppisite charges. The resulting comp...

AG
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Explain the substitution reaction of a primary halogenoalkane with sodium hydroxide.

First of all, it is important to determine what kind of substitution reaction the halogenoalkane will undergo. We are given the information that it is a primary halogenoalkane, which generally undergo a S...

RS
Answered by Rutger S. Chemistry tutor
4630 Views

When should I use ‘y’ and when should I use ‘en’?

‘Y’ and ‘en’ are pronouns which can be used to represent a phrase, instead of writing out the entire phrase. ‘Y’ roughly translates as ‘there’, and ‘en’ roughly translates as ‘of it’, but the exact meanin...

LH
Answered by Louise H. French tutor
1930 Views

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