Why is lead a pure substance?AIt is composed of many different substances.BIt can be separated by different chemical processes.CIt has a chemical composition that is not fixed.DIt is an element that is naturally occurring in nature.

A chemist is studying a substance and concludes that it is a pure substance. What MUST be true about the substance?AIt occurs naturally.BIt is synthetic.CIt is harmless to humans.DIt is an element or compound.

By definition, a Pure Substance isGroup of answer choicesa mineral that is 100% pure (does not contain even a trace of impurities)a chemical extract from a plant or animal that has been purified in a laboratoryan element or a compound that may exist as a gas, liquid or solida pure crystalline, naturally occurring solid

What do you mean by a pure substance?

n object is made from a material that is hard, shiny, and can be hammered into thin sheets. Which of these is another likely property of the material?aIt dissolves in water.bIt has a low boiling point.cIt is a good conductor of heat.dIts density is less than that of water.

A chemist takes four samples of a substance. Each sample has a different flammability. What can the chemist conclude about the substance?AIt is made by humans.BIt occurs naturally on Earth.CIt contains rare elements.DIt is not a pure substance.