Pure Substance or Mixture - Round One

Front

What is a pure substance?

Back

A pure substance is a material that has a constant composition and consistent properties throughout. Examples include elements like gold and compounds like water (H2O).

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded. Mixtures can be homogeneous (uniform composition) or heterogeneous (distinct phases).

Front

Is salt (NaCl) a pure substance or a mixture?

Back

Salt (NaCl) is a pure substance because it consists of only one type of compound.

Front

Is saltwater (NaCl + H2O) a pure substance or a mixture?

Back

Saltwater is a mixture because it contains both salt and water, which can be separated by physical means.

Front

What is an example of a homogeneous mixture?

Back

An example of a homogeneous mixture is air, which is a uniform mixture of gases.

Front

What is an example of a heterogeneous mixture?

Back

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

Front

What charge does an electron have?

Back

An electron has a negative charge.

Front

What is the difference between a compound and a mixture?

Back

A compound is a substance formed when two or more elements are chemically bonded, while a mixture is a physical combination of substances that retain their individual properties.

Front

Can mixtures be separated by physical means?

Back

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

Front

What is an example of a pure substance?

Back

An example of a pure substance is pure water (H2O), which has a consistent composition.