What roles do society, politics, and economics play in science?

Design techniques and materials that reduce the negative environmental impact of a structure are referred to as

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?

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