Sodium bicarbonate is formed by mixing carbon, sodium, hydrogen and oxygen molecules. This mixture, also known as baking soda, is actually a type of salt.

Ordinary table salt is called sodium chloride. It is considered a pure substance because it has a uniform and definite composition. All samples of sodium chloride are chemically identical. Water is also a pure substance.

The two main types of pure substances are compounds and elements. They consist of a single type of particle or compound.

Both pure substances and mixtures have properties like weight, color, volume, flammability, toxicity, etc. Similarly, a pure substance and a homogeneous mixture will have the same properties throughout the entire substance or mixture. Hope this helps.

Physical properties of a substance are characteristics that can be observed without altering the identity of the substance. Color, odor, density, melting temperature, boiling temperature, and solubility are examples of physical properties. Physical properties can be used to identify a pure substance.

You can identify an unknown substance by measuring its density and comparing your result to a list of known densities. Density = mass/volume. You can determine the volume by dropping the object into a graduated cylinder containing a known volume of water and measuring the new volume.

Air, tap water, milk, blue cheese, bread, and dirt are all mixtures. If all portions of a material are in the same state, have no visible boundaries, and are uniform throughout, then the material is homogeneous. Examples of homogeneous mixtures are the air we breathe and the tap water we drink.

Tap water contains minerals, air, chlorine and other dissolved impurities that varies from place to place, therefore it is a mixture.

A Tea is a solution of compounds in water, so it is not chemically pure. B Because the composition of the solution is uniform throughout, it is a homogeneous mixture.

O