Low to Middle level taxpayers take their tax deductions seriously and want everything possible that will lower their tax burden or better yet, increase their REFUND. The National Association of Home Builders estimates that deducting MI premiums will save homeowners more than $1.3 billion per year so this is important stuff.
Sulfur and iron: since this is a mixture, the sulfur retains its properties (its yellow color, for example), and the iron retains its properties (its black color, for example). These properties can be used to separate the two elements. For iron sulfide, two elements (sulfur and iron) are heated together so that they form the compound iron sulfide. Although iron sulfide contains both sulfur and iron, it is not a mixture: it is a pure substance. Both the sulfur and the iron have âgiven upâ their individual properties to become a compound.
A chemical substance (also called a pure substance) may well be defined as any material with a definite chemical composition in an introductory general chemistry textbook.According to this definition a chemical substance can either be a pure chemical element or a pure chemical compound.But, there are exceptions to this definition; a pure substance can also be defined as a form of matter that has both definite composition and distinct properties. common example of a chemical substance is pure water; it has the same properties and the same ratio of hydrogen to oxygen whether it is isolated from a river or made in a laboratory.