Module 4

• Pure substance are further classified as. element and compounds
• when two or more elements are combined. Compounds
• is a concoction whose configuration varies from spot to spot within the sample. heterogeneous
• different kinds of elements combined physically and not chemically. substance
• occasionally called a "solution". homogeneous
• Two types of homogeneous. solution and a colloid
• Intermediate between solution snd suspension. colloid
• solid particles are spread throughout the liquid without dissolving. suspension
• Composition is uniform. Heterogeneous
• composition is not uniform. Homogeneous
• Two types of compounds. Organic compound and inorganic compound
• inorganic compounds do not have carbon atoms in them and these compounds are found in nonliving organisms.
• organic compounds are characterized by the presence of carbon atoms in them and are commonly found in most living things.
• in our everyday lives we use many compounds which scientist call acids.
• an acid is any hydrogen containing substance that can donate a proton to another substance their ph values are always less than seven