Chpt 15 Science Vocab

the smallest piece of matter that still retains the property of the element

a description of a substance; color, state of matter, temperature, volume, etc.

a change of one substance to another

a characteristic of a substance that indicates whether it can undergo a certain chemical change

• a type of mixture with particles that are larger than those in the solutions but not heavy enough to settle out.        
• (colloid-greek, glue)

a substance in which the atoms of two or more elements are combined in a fixed proportion

the process for separating substances in a mixture by evaporating a liquid and

all the atoms in a substance have the same identity

20 other elements have been made laboratories

about 90 elements are found on earth

the tendency of a substance to burn

a mixture in which different materials can be distinguished easily

contains two or more gaseous, liquid, or solid substances blended evenly throughout

the mass of all substances that are present before a chemical change equals the mass of all the substances that remain after they change

a material made up of two or more substances that can be easily separated by physical means

a certain aroma

a change in size, state, or shape of matter

any characteristic of a material that you can observe without changing the identityof the substances that make up the material

a homogeneous mixture of particles so small that they cannot be seen with a microscopeand will never settle to the botton of their container

a type of matter with a fixed composition

a heterogeneous mixture containing a liquid in which visible particles settle

a chemical reaction between silver metal and sulfur compounds in the air which results in silver sulfide

the total mass of reactants

the paticles in the colloid are large enough to scatter light, but those in the solution are not