Question

Which one of the following is not an example of a pure substance?
oxygen
copper
carbon dioxide
The process of loading helps to
slow down the rate of sedimentation
speed up the rate of sedimentation
speed up the rate of decantation
slow down the rate of decantation
Transferring the clear liquid, into another container, leaving behind the residue,
is called
sedimentation
decantation
condensation
crystallisation
5.
A substance, that sublimes easily, is-
naphthalene
salt
sugar
chalk​

Answer 1

Answer:

Answer: Aerated water is a homogeneous mixture of carbon dioxide and water. It is not a pure substance. Carbon dioxide is a compound while oxygen and zinc are elements which are a type of pure substance.

Explanation

Hope that helps you a lot dear

Answer 2

Answer:

1. oxygen
2. speed up the rate of sediment
3. decantation
4. chalk