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The point A lies on the curve with equation y=x^0.5. The tangent to this curve at A is parallel to the line 3y-2x=1 . Find an equation of this tangent at A. [5 marks]

Differentiate equation dy/dx=0.5*x -0.5 Gradient is the same as the second equation 2/3=0..5*x -0.5 Solving this will give the x coordinate x = 9/16 Sub into equation for y coordinate y = (9/16) 0.5 Solve fo...
AM
Answered by Arnold M. • Maths tutor
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Describe the bonding and structure in solid sodium chloride

It is a giant lattice structure. Sodium ions (Na+) are positively charged and chloride ions (Cl-) are negatively charged. There is ionic bonding between - strong electrosatic forces of attraction between opp...
AK
Answered by Arushan K. • Chemistry tutor
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When and where should I modulate in a Bach Chorale harmonisation?

A really good way to help yourself with every step of Bach Chorales is to write out a chart of all the notes that the home key, and any keys that you modulate to. This will help make sure you can easily see ...
JW
Answered by Jenny W. • Music tutor
9242 Views

Breifly describe the cohesion-tension theory in plants?

Water evaporates from the cells and leaves the plant once the stomata open, This creates a suction which pulls more water into the leaf As water is cohesive due to hydrogen bonds, when one molecule moves oth...
BQ
Answered by Brendan Q. • Biology tutor
31236 Views

What is meant by the term salt? And how would you confirm if the salt had chloride ions in?

Part 1: "A salt is is when the H + ion in an acid is replaced with a cation (e.g. a metal)" Part 2: You would use the silver nitrate test for halide ions. You add dilute nitric acid (which avoids g...
BQ
Answered by Brendan Q. • Chemistry tutor
3645 Views