Chapter 15 Flashcards
a substance with the same kind of atoms
element
a substance that has two or more elements combined in a fixed proportion
compound
the process of separating substances, such as salt and water, in a mixture by evaporating a liquid and reconvening its vapor
distillation
identify four physical properties that describe a liquid
color, state of matter, size, and shape
the law stating that the mass of all substances present before a chemical change, known as the reactants, equals the mass of all of the substances that remain after the change, which are called the products
law of conservation of mass
name the two types of weathering and give examples for each
physical (water seeps into cracks between rocks, slowly splitting them apart)
chemical (limestone reacts chemically with slightly acidic water, causing new substance to form)
a change of one substance to another
chemical change
any characteristic of a material that you can observe that produces one or more new substances
chemical property
a change in size, shape, or state of matter in which the identity of the substance remains the same
physical change
any characteristic of a material that you can observe without changing the identity of the substance
physical property
c/c mixtures and substances
mixtures = pure substance that under physical change; do not always contain same proportions of components
pure substance = can change between chemical forms (always contains same proportions of components)
t/f: solutions and homogeneous mixtures are not the same thing
false
a mixture that remains constantly and uniformly mixed and has particles that are so small that they cannot be seen with a microscope
homogeneous mixture
explain how you can utilize the tyndall effect to identify a colloid from a solution
pass a beam of light through it; light cannot pass through mixtures, but can pass through colloids
the scattering of a light beam as it passes through a colloid
tyndall effect
a heterogeneous mixture with solid particles that never settle within the liquid
colloid
a heterogeneous mixture composed of a liquid and solid particles that settle within the liquid
suspension
what are the two types of mixtures?
heterogeneous and homogeneous
