C1: Atomic structure and the periodic table Flashcards
1
Q
How can you tell that a chemical reaction is taking place?
A
there was a flame
* energy was given out
* a new substance was formed
* the magnesium turned into a (white) powder
2
Q
The magnesium needed heating before it would react.
What conclusion can you draw from this?
A
(c) The reaction has a high activation energy
3
Q
(e) Why are nanoparticles effective in very small quantities?
A
(e) They have a high surface area to volume ratio
4
Q
A student tested a metal chloride solution with sodium hydroxide solution.
A brown precipitate formed.
What was the metal ion in the metal chloride solution?
A
Iron(III)
