Term
Chemistry is the study of
•A) matter
•B) transformations of matter
•C) only microscopic phenomena
•D) only macroscopic phenomena
•E) both (a) and )b) |
|
Definition
|
|
Term
Imagine that you can see individual molecules. You watch a small collection of molecules that are moving around slowly while vibrating and bumping against each other. The slower-moving molecules then start to line up, but as they do so their vibrations increase. Soon all the molecules are aligned and vibrating about fixed positions. What is happening?
•A) the sample is being cooled and the material is freezing
•B) The sample is being heated and the material is melting
•C) The sample is being cooled and the material is condensing.
•D) The sample is being heated and the material is condensing
•E) The material is unchanged |
|
Definition
•A) the sample is being cooled and the material is freezing |
|
|
Term
The phase in which atoms and molecules no longer move is the
•A) solid phase
•B) liquid phase
•C) gas phase
D) none of these |
|
Definition
|
|
Term
|
Definition
•A physical property describes the look or feel of a substance. |
|
|
Term
|
Definition
•A chemical property describes the tendency of a substance to transform into a new substance. |
|
|
Term
|
Definition
•Physical change: a change in the physical properties of a substance.
•A physical change imposes a new set of conditions on the same material.
|
|
|
Term
|
Definition
•Chemical change: the transformation of one or more substances into others.
•A chemical change forms a new material with its own unique set of physical properties.
|
|
|
Term
The transformation of oxygen, O2, into ozone, O3, is an example of
A.a physical change.
B.a chemical change.
C.both a physical and chemical change.
D.neither a physical nor chemical change. |
|
Definition
|
|
Term
True or False:
Both physical and chemical changes result in a change in physical appearance |
|
Definition
|
|
Term
Melting a piece of solid gold would be…
A.a physical change.
B.a chemical change.
C.both a physical and chemical change.
D.neither a physical nor chemical change.
● |
|
Definition
|
|
Term
Tarnishing a piece of silver would be…
A.a physical change.
B.a chemical change.
C.both a physical and chemical change.
D.neither a physical nor chemical change.
● |
|
Definition
|
|
Term
|
Definition
•A material made of only one kind of atom. Pure gold is an example as it is made of only gold atoms. |
|
|
Term
|
Definition
| The fundamental unit of an element |
|
|
Term
|
Definition
A substance consisting of atoms of different elements. |
|
|
Term
|
Definition
•Used to show the proportion by which elements combine to form a compound.
Ex: Sodium chloride NaCl
Ammonia NH3
Water H2O
|
|
|
