1,776 free study cards across 10 topics, written to the Edexcel specification. Study them as flashcards or multiple choice, and rate each one Got it, Almost or Forgot.
Every card is tagged to a topic in the Edexcel GCSE Chemistry specification, so you can revise one topic at a time.
Three cards from the deck, as you will see them in BrainBerry: the question, the answer, and an explanation of why.
Give the formula of methanoic acid and describe its displayed structure.
HCOOH. A carbon atom with a hydrogen atom attached, a double bond to one oxygen and a single bond to a second oxygen, which carries a hydrogen atom.
Methanoic acid is the first carboxylic acid, with only one carbon atom, and that carbon is part of the acid group itself. It is the acid in an ant sting.
What is seen at each electrode when copper sulfate solution is electrolysed with inert electrodes?
A pink-brown layer of copper builds up on the cathode and bubbles of oxygen appear at the anode. The blue colour of the solution fades.
The gas relights a glowing splint, which is the test for oxygen. The solution turns more acidic as copper ions are removed and hydrogen ions are left behind.
State the relative mass and relative charge of a neutron.
Relative mass 1, relative charge 0.
A neutron has the same relative mass as a proton but carries no charge, so adding neutrons changes an atom's mass without changing its charge or its element.
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