1. Pure substances cannot be separated into any other kinds of matter, while a mixture is a combination of two or more pure substances.
2. A pure substance has constant physical and chemical properties, while mixtures have varying physical and chemical properties (i.e., boiling point and melting point).
3. A pure substance is pure, while a mixture is impure.
Answer: d. smaller.
Explanation:
Hybridization :
![N=\frac{1}{2}[V+N+A-C]](https://tex.z-dn.net/?f=N%3D%5Cfrac%7B1%7D%7B2%7D%5BV%2BN%2BA-C%5D)
N = number of electrons
where, V = number of valence electrons present in central atom i.e. oxygen = 6
N = number of monovalent atoms bonded to central atom=32
C = charge of cation = 0
A = charge of anion = 0
The number of electrons is 4 that means the hybridization will be 
and the electronic geometry of the molecule will be tetrahedral. The bond angle for tetrahedral geometry is 
But as there are two atoms around the central oxygen, the third and fourth position will be occupied by lone pair of electrons. The repulsion between lone and bond pair of electrons is more and hence the molecular geometry will be bent and the bond angle will be smaller than expected and is 
Question 1:
Part 1: A rock formed when an already existing rock is subjected to extreme heat and pressure is metamorphic.
Part 2: A rock formed from particles that are deposited and lithified is sedimentary.
Part 3: A rock formed from cooled and hardened magma or lava is igneous.
These are correct. Ironic they are already in the correct order.
~Hope this helps!
Answer:
A.................. I think the answer
