Search our library of Chemistry GCSE questions

Top answers

Chemistry

GCSE

Magnesium reacts with hydrochloric acid to form a salt. What volume of 0.2dm(-3) HCL is required to react with 4g of Magnesium? Give answer in cm(3).

First draw out the equation. Mg + HCL = MgCl₂ + H₂Now balance this equation Mg + 2HCl = MgCl₂+ H₂Next we need to work out the moles of Mg. We know that we have...

Answered by Katie C. • Chemistry tutor

4395 Views

In the flowing equitation 2H2+O2→2H2O how many grams of oxygen are needed to make 9g of water?

2H₂+O₂->2H₂OThe best way to answer any mass balancing questions like this is to set the information in a table as follows and fill in the blanks: 2H₂+ O

Answered by Caroline O. • Chemistry tutor

12706 Views

Describe how elements are arranged in the periodic table

Elements in the periodic table are arranged in order of increasing atomic (proton) number. Elements with the same number of electron shells are arranged in the horizontal rows (periods), and elements with...

Answered by Georgia C. • Chemistry tutor

33653 Views

On the reaction profile below, label the activation energy and the energy given out ((delta)H) - 2 marks

1 mark for each correct label

Answered by Mike S. • Chemistry tutor

1720 Views

Balance the following equation for the formation of magnesium chloride: Mg + HCl --> MgCl2 + H

Mg + 2HCl --> MgCl2 + H2
There are two chlorines in magnesium chloride so you put a two in front of the hydrochloric acid. This means that you need to put a 2 aft...

Answered by Helen G. • Chemistry tutor

3336 Views