Chemistry

are the simplest pure substance, because they are made up of only one type of atom

• element

• atom

• matter

• compound

• molecule

are pure substances that are made up of more than one type of element, chemically combined in a fixed ratio

• matter

• compound

• element

• molecule

• electron

Since the elements within a compound are chemically combined, they can only be separated by chemical changes, such as the change caused by electrolysis.

True or False

• True

• False

Compounds have a definite chemical composition that can be identified using a chemical formula. Water (H2O), salt (sodium chloride, NaCl), and sugar (glucose, C6H12O6) are all examples of compounds.

True or False

• False

• True

Mixtures are made up of two or more substances that are not chemically combined. Because they are not chemically combined, the substances retain their own individual properties of matter, even though they are mixed together. Furthermore, mixtures can be separated by physical means, such as filtration or distillation.

True or False

• False

• True

A homogeneous mixture is uniform. That is, it has the same properties throughout. Solutions and alloys are two types of homogeneous mixtures. In a solution, one substance is dissolved into another substance (e.g., salt water, instant coffee).

True or False

• True

• Flase

The substance being dissolved is called the ________, and the substance doing the dissolving is called the ________.

Fill in the blank

• product, reactant

• molecule, atom

• solute, solvent

• subject, product

_________ is uniform it has 2 types a solution and alloy, a solution of a solid in a liquid can generally be separated through the process of vaporization. An alloy is a solid solution in which one metal is dissolved into another (e.g., the alloy brass is made of copper and zinc).

• Physical reaction

• Chemical reaction

• renewable and non renewable sources

• Homogenous mixture

__________ are fluids which contain insoluble solid particles that eventually settle out. A mixture of fine sand and water is a _________. The pictures below illustrate how, after being mixed with water, sand particles settle to the bottom of the container.

• Reaction

• Formula

• Suspensions

• Heterogenous mixture

• Brake fuel

____________ does not have the same properties throughout. In fact, the substances in a mixture often keep their own separate identities and individual properties.

• Heterogenous mixture

• Temperature

• Homogenous mixture

• Colloids