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Explain what is meant by the term "rate of reaction".

A change in the concentration of reactants or products per unit time

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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

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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

7296 Views

A drawer contains ten identical yellow socks, eight identical blue socks and four identical pink socks. Amrita picks socks from from the drawer without looking. What is the smallest number of socks she must pick to be sure that she has at least two pairs

(question continued): of matching socks? A) 5 B) 6 C) 8 D) 11 E) 13
Answer: Try applying each number starting from the smallest, you will find that with 6 socks there will always be at least 2 pairs...

Answered by Virginia B. • Maths tutor

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