Chapter 1 - Chemical Foundations

quantitative observation

quantitative observation

A(n) ________ is also known as measurement involves a number and a unit.

pure substance

When a mixture contains several volatile components, the one- step distillation does not give a(n) ________ in the receiving flasks, and more elaborate methods are required.

possible explanation

A hypothesis is a(n) ________ for an observation.

mixture

When a(n) ________ is separated, the absolute purity of the separated components is an ideal.

electric current passes

When a(n) ________ through, water is decomposed to hydrogen and oxygen, which makes them be two- atom molecules.

STM

The ________ uses an electron current from a tiny needle to probe the surface of a substance.

Solid

________ is rigid and has a fixed volume.

gasoline

Wood, ________, wine, soil, and air are the mixtures.

hydrogen

Water is composed of two types of atoms: ________ and oxygen.

qualitative

A(n) ________ does not involve a number.

liquid

A(n) ________ has a definite volume but no specific shape.

bridges

The atoms are connected to one another by ________.

motives

Science is affected by profit ________, budgets, fads, wars, and religious belief.

Celsius

Both the ________ and Kelvin scale are used in physical sciences.

Density measurement

________ is also used to determine the amount of antifreeze and the level of protection against freezing.

Distillation

________ is one of the most important methods for separating the components of a mixture.

Theories

________ are human inventions that represent attempts to explain observed natural behavior.

Physical change

________**: It is used to separate a used mixture into pure compounds and change in the form of a substance.

pure substances

Mixtures can be separated into ________ by physical methods.