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State the trends in reactivity of the group 1 and group 7 elements and explain the reasons why.

Elements react by gaining or losing electrons. Elements wants to reach the stable state of having 8 electrons in the outermost ring, so group 1 elements react by losing an electron, since they have only 1...

LF
Answered by Lorne F. Chemistry tutor
54171 Views

Represent x = 0.0154 recurring as a fraction.

To represent x = 0.0154 recurring as a fraction you need to eliminate the recurring element. You do this by finding the nearest multiple of x with the same recurring decimal element. For example, multiply...

LF
Answered by Lorne F. Maths tutor
4254 Views

Calculate 64^2/3. (No calculator)

642/3 may seem difficult to calculate at first but really boils down to two simple steps. This is because 642/3 = (641...

HL
Answered by Harry L. Maths tutor
81737 Views

Is momentum a vector quantity? Why?

Yes - Momentum is a vector quantity. A vector quantity possesses both a magnitude and direction. A scalar quantity possesses only a magnitude and no direction. Mass is an example of a scalar quantity (mas...

HL
Answered by Harry L. Physics tutor
50297 Views

What is the difference between the preterite and imperfect tenses?

This is an incredibly common query, and often the best way to ensure you can fully distinguish between the two is to read, read, read.

As a rule, however, the preterite is used to describe actions ...

KJ
Answered by Katie J. Spanish tutor
3921 Views

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