Question

reactivity
the ability of a substance to react with another substance is called reactivity. reactivity is another example of a chemical property.
some elements react very easily with other elements. for example, if you drop a piece of aluminum foil into vinegar, tiny gas bubbles form. however, if you drop a piece of copper wire into vinegar, no gas bubbles will form. bubbles are one clue that a chemical reaction is taking place. in nature, reactive elements are usually found as compounds. less - reactive elements are more likely to be uncombined.
reading check

1. identify in nature, what kind of elements are likely to be found as compounds?

how can chemical properties determine uses?
in some cases, a chemical property can cause problems. iron is an element that has many useful physical and chemical properties. however, iron reacts readily with oxygen. this chemical property can be undesirable in some situations.
iron reacts with oxygen in the air to form rust. cars are made mostly of steel, which is a mixture of iron and other metals. the paint on a car can prevent the iron from reacting with oxygen. however, over time, the iron may become exposed to the air and the reaction between iron and oxygen can occur.
this hole started as a chip in the paint. the chip exposed the iron in the car to oxygen. the iron rusted and crumbled away.
steel contains iron. paint on the steel keeps the iron from rusting. this is because paint does not react with oxygen.
the bumper does not have any rust because it is covered with chromium. chromium does not react with oxygen.
looking closer

1. identify which of the following reacts most easily with oxygen - iron, paint, or chromium?

Explanation:

Explicaciones Breves:

1. Según el texto, en la naturaleza, los elementos reactivos son los más probables de encontrarse como compuestos.
2. El texto indica que el hierro reacciona readily con el oxígeno, mientras que la pintura y el cromo no lo hacen. Entonces, el hierro es el que reacciona más fácilmente con el oxígeno.

Respuesta:

1. Los elementos reactivos.
2. Hierro.

Answer:

Explicaciones Breves:

1. Según el texto, en la naturaleza, los elementos reactivos son los más probables de encontrarse como compuestos.
2. El texto indica que el hierro reacciona readily con el oxígeno, mientras que la pintura y el cromo no lo hacen. Entonces, el hierro es el que reacciona más fácilmente con el oxígeno.

Respuesta:

1. Los elementos reactivos.
2. Hierro.