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A student heats a bar of chocolate in the microwave for one minute. When they remove the bar they observe that there are patches of melted chocolate with unmelted chocolate between them. Suggest the mechanism of how this happens.

This question is about standing waves, the bar of chocolate melts only in the positions where antinodes are formed on the standing wave as they transfer the most energy as they have the greatest amplitude of...
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Answered by Haydn D. • Physics tutor
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A compound being analysed has the percentage composition by mass Ca = 13.9%, W = 63.9%, O = 22.2%. Calculate the empirical formula of this compound

Using rows to represent mathematical operations and a column for each compound we can draw ourselves a table: Ca W O % 13.9 63.9 22.2 Atomic Mass (Ar) 40 184 16 % / (Ar) 0.348 0.347 1.43 Ratio 1 : 1 : 4 This...
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Answered by Haydn D. • Chemistry tutor
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How do I sketch a quadratic function on graph paper?

First you need to draw a set of axis and choose a sensible scale, This is detrmined by parts of the equation such as the x and y intercept. Then what we need to do is to make a table of values. We can do X f...
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Answered by Jacob B. • Maths tutor
4094 Views

How do I expand brackets?

Say we have the brackets (x+1)(x+2) we would expand this by timesing everything in one bracket by everything in the other Demonstrate the claw method in the teaching workplace This gives us x 2 + 2x + 1x +2 ...
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Answered by Jacob B. • Maths tutor
3423 Views

How do I find the gradient of a line?

The gradient is how much the x value changes when you change the y value by 1. We can find the gradient using 2 coordinates on a line. It is equal to (y1-y2)/(x1-x2) I would do an example on the board
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Answered by Jacob B. • Maths tutor
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