Top answers

Simultaneous equation: (x-3y)=9,(2x+3y)=0

Using one of the equations we express either x in the form of y, or y in the form of x. We then put this expression of x/y into the other equation. This allows us to calculate the numerical values of both x ...
KT
Answered by Kerushan T. • Maths tutor
4958 Views

Describe what happens to sodium and chlorine in a reaction to make Sodium cholride, you may use diagrams to help you.

As Sodium is a metal and Chlorine is a non-metal they will undergo an ionic reaction in which Sodium will lose an electron and donate it to the Chlorine atom which will gain an electron. This will create a p...
GS
4117 Views

ABCD is a rhombus on a graph. B(7,10). AC: y=7-4x. Find an equation for DB in the form tx+py+r=0 where t,p&r are integers.

AC and DB must be perpendicular therefore m 1 m 2 = -1. (we can work out the gradient of DB)-4 m 2 = -1 -----> m 2 = 1/4The equation of a line is y-y 1 =m(x-x 1 ) (sub in x, y and gradient values)y - 7 = ...
AL
Answered by Alexander L. • Maths tutor
3356 Views

An industrial process converts the alkene ethene into ethanol, according to the following reaction: C2H4 + H2O --> CH3CH20H. What mass of ethanol can be made from 53g of ethane, given that the water is in excess. (2 marks) (6-7 grade)

This question is all about using the mols equation question (mols = mass/molecular weight). It's best to break it down into steps: 1) calculate the molecular masses of the compounds that are involved in the ...
CS
Answered by Charlie S. • Chemistry tutor
10509 Views

Why do metallic compounds conduct electricity ?

metallic compounds conduct electricity as they all share the property of having a 'sea of electrons' which means that they have free floating electrons surrounding the compound. This sea of electrons is due ...
NE
Answered by Naomi E. • Chemistry tutor
2933 Views