Answer : A
Explanation:
Answer A is correct I just did the assignment.
Answer:
What's the rest of the question
Explanation:
An element is made up of only one kind of atom.
So H2 is the element. Why? because H2 is made up of only one kind of atom, hydrogen atoms.
- Just as a side note, compounds (made up of atoms from more than one element) are also considered pure substances.
Answer:
The main source of agricultural methane is a process called enteric fermentation, a normal part of digestion in ruminant animals such as cows, sheep, goats, buffaloes and camels. This process produces methane gas, which the animals then belch out into the atmosphere.
A mixture is said to be homogeneous if its composition is uniform throughout the mixture. They are referred to as solutions. On the other hand, heterogeneous mixture does not have uniform composition. The substances present in the mixture have visible difference or phases.
Sea water is composed of salt, sand and water. Here, salt and water form homogeneous mixture but due to the presence of sand, the mixture is heterogeneous. Salt dissolves in water and the solution has uniform composition but sand does not dissolve in water, even after vigorous mixing, after some time it settles at the bottom resulting formation of layers. Thus, sea water containing salt, water and sand is a heterogeneous mixture.