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Describe and explain the trend of reactivity of group 2 metals with water

reactivity increases DOWN the group Extra shells of electrons means there is increased shielding, and therefore atomic radii increases even though nuclear charge increases, the extra shielding outweighs this...
AH
Answered by Amber H. • Chemistry tutor
3393 Views

6x – 7 = 14 – x

The first thing you need to do is collect all the 'like terms' on the same side of the equation. Start with the 'x' terms and remember to reverse the signs as you cross them over to the other side. 7x - 7 =1...
JW
Answered by Jessica W. • Maths tutor
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Factorise 2x^3=10x+12x^2

Move everything to the same side: 2x^3-12X^2-10x=0 2.Take out a factor of 2x: 2x(x^2-6x-5)=0 3.Complete the square on the quadratic: 2x[(x-3)^2-14]=0
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Answered by Faye H. • Maths tutor
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Explain, using appropriate laws of motion, why the air exerts a force on the engine in the forward direction.

This question is taken from AQA 2016 question 1 part 2, http://filestore.aqa.org.uk/sample-papers-and-mark-schemes/2016/june/AQA-74071-QP-JUN16.PDF The force is acting on the air by the engine. By Newton's 2...
WL
Answered by William L. • Physics tutor
7366 Views

Describe how a competitive market would react to excess supply.

In competitive market, there is no governement interference and a lot buyers and sellers, so the market can operate equilibrium. When there is excess supply, there are too many goods which are not purchased ...
WL
Answered by William L. • Economics tutor
6076 Views