So that the mircrobes present could get help to perform anariobïc repiration (respiration without oxygen).....as it helpfull for decomposing the sewage waste ...also to prepare sideproduct called metane gas
Answer: a) The density of the jewelry will be 
b) The element is silver.
Explanation:
Density is defined as the mass contained per unit volume.
Given : Mass of jewelry = 132.6 grams
Volume of jewelry = volume of water displaced = 
Putting in the values we get:
Thus density of the jewelry will be 
As density is characteristic of a particular material , the material must be silver which has a density of 10.5 g/ml.
Solid, ductile, and malleable. Ductile means it can conduct heat, and malleable means it can be shaped differently. hope this helps
Answer: Changing the amount of solute and volume of solvent we can change physical properties of the given salt water solution.
Explanation:
Physical properties are defined as the properties which does not cause any change in chemical composition of a substance. For example, density, mass, volume, etc are all physical properties.
When we take a salt water solution then on adding more amount of salt into the water there will occur change in density of the solution as density is mass present per liter of solution.
Also, if we add more amount of solvent then there will occur change in volume of the solution.
Hence, in both the cases physical properties of the solution are changing and no change in its chemical composition is taking place.
B is the correct answer! I learned this in class last week :)
