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Why are zinc and Scandium not transition metals?

A transition metal is defined as an element that forms a stable ion with incompletely filled d orbitals. Scandium forms a 3+ ion with no electrons in its d orbitals and zinc forms a 3+ ion with completely...

EO
Answered by Ellie O. Chemistry tutor
25904 Views

What are recursive functions and when should they be used?

A recursive function is one that calls itself from within its own code, usually in order to perform the same operation on a smaller part of the original input, or on an edited version of the input. Recurs...

JB
Answered by Joseph B. Python tutor
1329 Views

To what extent is a film director the 'main author' of a film?

The concept of authorship in cinema is a discourse fraught with a variety of ideological, commercial and practical questions and tensions. In comparison to literature, where it is commonplace for a novel ...

CG
3300 Views

What is the difference between liberalism and neo-liberalism?

Neo-liberalism is the economic subset of liberalism. Liberalism is a political theory about all aspects of society - human nature, the role of the state, freedom, equality, the economy. Neo-liberalism is ...

TA
4621 Views

The mass of a balloon is 0.02g before it is filled with air. After it is blown up with air the mass is 0.04g. Assuming oxygen makes up 21% of air, calculate the number of moles of oxygen in the balloon.

After the balloon has been blown up with air it increased its size by 0.02 g (Final mass - initial mass = mass of the air).We are told that of oxygen takes up 21% of air. Therefore, we need to work out 21...

GS
Answered by Greta S. Chemistry tutor
2399 Views

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