Which refers to any disturbance that carries energy from one place to another? wave trough motion crest

The formation of a solid, also known as a is an indication of a chemical change. precipitate particulate particle powder

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.

Asample of hydrated tin (ii) chloride (sncl2) has a mass of 4.90 g. when it is dehydrated, it has a mass of 4.10 g. which is the correct chemical formula for the hydrate? sncl2•2h2o          sncl2•4h2o          sncl2•6h2o