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What is ionic bonding?

Ionic bonding occurs between positive and negatively charged ions. A simple example is Sodium Chloride. Sodium has 1 outer shell electron which it wants to lose in order to create a stable electronic conf...

Answered by Elizabeth N. • Chemistry tutor

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(x+4)((x^2) - kx - 5) is expanded and simplified. The coefficient of the x^2 term twice the coefficient of the x term. Work out the value of k.

(x + 4) (x² - kx - 5) = x³- kx² - 5x + 4x² - 4kx - 20 = x³ + (4-k)x² + (-5-4k)x - 20.The coefficients are: (4-k) of x² and (-...

Answered by Márk F. • Further Mathematics tutor

9933 Views

A straight line passes trough the points A(-4;7); B(6;-5); C(8;t). Use an algebraic method to work out the value of t.

We can write the equation of a straight line like y=ax+b, where a and b are constants. If a point is on the line, the equation will be true for the x,y of the point.Now start with point A: 7 = (-4)a + b. ...

Answered by Márk F. • Further Mathematics tutor

7352 Views

How and where oxygen is produced in photosynthesis?

Photosynthesis takes place in the chloroplasts of plant cells. Photosynthesis is the process by which carbon dioxide, water and light energy are used to produce oxygen and glucose:6CO₂ + 6H

Answered by Anyanna H. • Biology tutor

19899 Views

Explain two disadvantages of specialisation.

Vulnerability, whether it be an employee, firm or country who specialise, producing only one good can be a risk if that industry were to collapse. An example of this is the increase in unemployment in the...

Answered by Kira E. • Economics tutor

3430 Views