Chem 121 Ch.1

Mixtures can still be separated by a physical means

Triatomic molecule contains 3 or more atoms

The naming convention of elements are very consistant and typically named after who discovered it

A new substance is never formed during a physical change. This only occurs with chemical changes

A pure substance is a single kind of matter that cannot be seperated into other kinds of matter by a physical means

A diatomic molecule is the simplest type of molecule that can exist containing only two atoms

Three physical states of matter exist. What are they?

The atom is the limit of chemical subdivision

The molecule is the limit of physical subdivision

What classification would a liquid fall into?

Define homoatomic molecule and the unique fact about them

How many of the 115 elements are naturally occuring?

Water (H20) Is an example of a compound because of the hydrogen gas and oxygen that can be split chemically

Components of a mixture do not retain their own identity once mixed

Define an element

When the group or cluster of atoms is relatively small and bound together tightly it is called a molecule

Sometimes chemical formulas will contain parenthesis such as (Al2(SO4)3. This is interpretted as 2 Al and 3 of the SO4

Matter is further classified in terms of its chemical composition as what?

Chemical change is the process in which a substance undergoes a change in chemical composition

Of the 9 million pure substances identified, only a small number of 115 are different from the others

What are some examples below of a physical property?

The classification of a sample is determined based upon whether shape and volume are definite or indefinite

What classification would a Gas fall into?

Mass is the amount of matter that is present in a population

Which two elements are dominant over all other elements?

An atom is the largest particle of an element that can exist

The other elements not considered to be the two dominant elements are known as 'impurities' when compared with the dom.

How many pure substance have Chemists been able to isolate and charactertize?

Atoms present in a molecule most all be the same

Each substance has a unique set of properties, what are they?

What classification would a solid fall into?

Define a mixture

Define molecule

Abbreviations for elements are known as chemical symbols and exist for all elements

What is the most abundant element on earth?

Define Matter

What are some examples of chemical change?

The scope of chemistry is extremely broad and touches all aspects of life

What are the other millions of pure substances known as?

Examples of an element are?

Based upon the observation that molecules can have more than one kind of atom, how are they further categorized?

What determinites are present when observing states of matter?

What are those 115 pure substances known as?

Other than being the smallest particle, what other traits are present regarding an atom?

Physical properties are the least common type of property

There is a subclass of mixtures called heterogenous or homogenous mixtures. Define these.

Chemical formulas are a concise way to present information about compound composition

27 of the 115 elements have been synthesized in a lab by bombarding samples of naturally occuring elements w/ sml parts

Pure substances always have a definite shape and constant composition

What is a chemical formula?

Define Chemistry

Define heteroatomic molecule and the unique fact about them

Define a compound

What is unique about polyatomic molecules?

A molecule is the smallest particle of a compound capable of stable independent existance

What are the three types of molecules that can be encountered?