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What are the products when an acid reacts with a metal?

An acid and metal react to form hydrogen and a salt. For example: Mg + 2HCl ----> MgCl2 + H2 1 mole of magnesium reacts with 2 moles of hydrochloric acid to form 1 mole of magnesium chloride and 1 mole of...
KF
Answered by Kate F. • Maths tutor
3847 Views

Two simultaneous questions are given as 3x+2y = 9, and x-2y = -5. Find the values for x and y

Can be solved in 3 ways: Substitution - can rearrange equation 2 to for x = 2y-5. Then substitute this in to equation 1 to form, 3(2y-5)+2y = 9. Multiply out the brackets and rearrange to form 8y = 24, so y=...
AS
Answered by Aman S. • Maths tutor
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Make y the subject of this formula: 9x = p(8 + y) + 5

When rearranging an equation, the most important thing to remember is that whatever you do to one side of the equation you must do to the other. In order to make y the subject you want to isolate it so that ...
TB
Answered by Tara B. • Maths tutor
4480 Views

Factorise x^2-25

=(x-5)(x+5)
UP
Answered by Urja P. • Maths tutor
3745 Views

How do you know what to do first when solving composite function?

So when you're solving a composite function you carry out the function closest to the 'x' first. It is useful to think of a composite function as the function of a function. Let me demonstrate with an exampl...
MF
Answered by Molly F. • Maths tutor
3709 Views