week 1, concept 2 : Classifying matter (matter and atoms) Flashcards
1
Q
A
concept 2 :
classifying matter
2
Q
A
chapter 2
atoms
3
Q
classification of matter
(visual)
A
4
Q
definition -
matter
A
anything that occupies space and has mass
5
Q
matter is physically separable into _
A
pure substance
and
mixtures
6
Q
Definition -
pure substance
A
- fixed composition
- cannot be further purified
7
Q
pure substances are_
A
- elements
- compounds (elements united in fixed ratios)
8
Q
elements cannot be_
A
- subdivided by chemical or physical means
9
Q
definition-
compound
A
- A pure substance
- that is made up of two or more elements in a fixed ratio by mass.
10
Q
definition-
mixture
A
- a combination of 2 or more pure substances
11
Q
Homogeneous matter =
A
-
uniform composition throughout (mixture)
(ie. sugar in water, salt water)
12
Q
Heterogeneous matter =
A
-
non uniform composition
(ie. sand and wate, or blood)
13
Q
Formula of a compound tells us _
A
- the ratios of its constituent elements
- and identifies each element by its atomic symbol.
14
Q
definition-
element
A
- A substance (for example, carbon, hydrogen, and iron) that consists of identical atoms.
15
Q
how many known elements?
A
116
22
Q
what type of representation of a water molecule is this?
A
Molecular formula
23
Q
what type of representation of a water molecule is this?
A
Structural formula
24
Q
what type of representation of a water molecule is this?
A
Ball and Stick model
