Chemistry - Paper 1 Flashcards
(4 cards)
1
Q
Why did Mendeleev’s periodic table become more widely accepted than previous versions?
A
Mendeleev had predicted properties of missing elements. Elements were discovered which filled the gaps made by Mendeleev and the properties of the elements matched his predictions.
2
Q
Why must the positive electrode be continually replaced?
A
The electrode reacts with oxygen and the electrode is carbon so carbon dioxide is produced.
3
Q
Why are substances added until in excess?
A
To ensure that a chemical reaction is complete and the reactants are all used up.
4
Q
A
