Elements, Atoms, Molecules, compounds Flashcards
1
Q
What is an atom?
A
The smallest possible unit of a substance
2
Q
What is an element?
A
A substance made up of the same type of atoms
3
Q
What is a compound?
A
Atoms of different elements combined.
4
Q
Mention examples of compounds
A
Na2O
HCl
OH-
H2SO4
5
Q
Mention features of a chemical reaction
A
Atleast a new substance is made
Compounds are broken
Atoms are neither created nor destroyed
Energy change occurs and can be measured
