Elements. Compounds. and Mixtures

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means.

Front

What is a compound?

Back

A compound is a substance formed when two or more elements are chemically bonded together.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded and can be separated by physical means.

Front

Can an element be broken down into simpler substances?

Back

No, an element cannot be broken down into simpler substances.

Front

Is salt (NaCl) a compound or an element?

Back

Salt (NaCl) is a compound.

Front

Which of the following is not a compound: HCl, Cl, NaCl, CO2?

Back

Cl is not a compound; it is an element.

Front

What is the difference between a compound and a mixture?

Back

A compound is made of two or more elements chemically bonded, while a mixture is made of substances that are physically combined.

Front

Give an example of a mixture.

Back

An example of a mixture is salad, which contains various ingredients that are not chemically bonded.

Front

What happens to the properties of elements when they form a compound?

Back

The properties of the elements change when they form a compound.

Front

Can mixtures be separated?

Back

Yes, mixtures can be separated by physical methods such as filtration or evaporation.