How are properties used?

Answer 1

Substances in some mixtures can be separated by physical means.

As you read in Chapter 11, you can separate salt and pepper because

they have different physical properties. Substances may also have

different chemical properties that can be used to separate them from

one another.Scientists who study dinosaur fossils and other fossils use chemical

properties to separate mixtures. Fossils are often scattered throughout

limestone. It can be difficult to chip limestone off a fossil without

damaging the fossil. However, limestone can be dissolved by vinegar.

A bubbling reaction occurs. Fossils, which are made of a different kind

of rock, do not react with vinegar as quickly. So scientists sometimes

use vinegar or similar chemicals to separate fossils from rock.Separating Metals from OresOres are rocks that include metals combined with other substances.

People rely on chemistry to release metals from their ores. For example,

iron ore contains iron oxide. Heating iron ore in a hot furnace with solid

carbon allows the iron to separate from the oxygen in the ore. The resultThe fossil does not

react quickly with

vinegar, but the

limestone around

the fossil does.

What evidence of

this reaction can

you detect?is pure iron and carbon

dioxide. This process

works because iron has

the chemical property of

bonding to oxygen less

strongly than to carbon.In this blast furnace, iron is separated from iron ore. The process relies on the different chemical properties of the substances heated here