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. It consists of only one kind of atom.

Front

What is a compound?

Back

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

Front

What is a mixture?

Back

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

Front

What is the difference between a homogeneous mixture and a heterogeneous mixture?

Back

A homogeneous mixture has a uniform composition throughout, while a heterogeneous mixture has a non-uniform composition with distinct, separate components.

Front

What is the chemical symbol for Hydrogen?

Back

The chemical symbol for Hydrogen is H.

Front

What happens when Carbon and Hydrogen combine to form methane?

Back

When Carbon (C) and Hydrogen (H) combine to form methane (CH4), they undergo a chemical reaction to form a compound.

Front

Is salt dissolved in water a homogeneous or heterogeneous mixture?

Back

Salt dissolved in water is a homogeneous mixture because the salt is evenly distributed throughout the water.

Front

What is an example of a heterogeneous mixture?

Back

An example of a heterogeneous mixture is a salad, where the individual components can be seen and separated.

Front

What does it mean for a mixture to be chemically combined?

Back

If a mixture is chemically combined, it means that the substances have reacted to form new substances with different properties.

Front

Can elements be broken down into simpler substances?

Back

No, elements cannot be broken down into simpler substances by chemical means.