Benchmark SC.8.P.8.5 Recognize that there are a finite number of elements and that their atoms combine in a multitude of ways to produce compounds that make up all of the living and non-living things that we encounter
SC.8.P.8.8 Identify basic examples of and compare/classify the properties of compounds, including acids, bases, and salts.
Combination of elements to form
compounds
Bellringer: 3 minutes!
CompoundsA compound is a substance which is made up of two or more elements that have been chemically combined together.
Elements chemically combined? What do you
mean?
Put the two together = sodium chloride!! Table Salt, a perfectly safe, edible compound
Sodium- is a soft silvery white metal that reacts
violently with water
CompoundsChlorine-is a poisonous, greenish yellow gas.
+
NaClSodium chloride
(table salt)
Table salt
is made
out Sodium
and
Chlorine.
Cannot be separated
by physical means!
It is different to Sodium and different to Chlorine!
A compound… Is a substance which is made up of two or more
elements that have been chemically combined.Can be broken down into a simpler type of matter
(elements) by chemical means (but not by physical means).
Has properties that are different from its component elements. Ex: In a water molecule Hydrogen and Oxygen are gases but when they combine together they form a liquid.
Always contains the same ratio of its component atoms. Ex: In a water molecule there are 2 Hydrogen atoms per every Oxygen atom (H2O). And in a peroxide molecule there are 2 Hydrogen atoms per every 2 Oxygen atoms.
Let’s check!
What is a compound?
Cu
Is this a compound?
It only contains one type of
element.
Is this a compound?
HH
H H
OO
O
Is this a compound?
It is not chemically combined.
Why not?
Why not?
Why not?
A compound is a substance which is made up of two or more elements that have been chemically combined together.
HIt only contains
one type of element.
OHH
OHH
OHH
Yes!
Is this a compound?
Examples of compounds
ACIDS• taste sour• and turn blue
litmus paper red.
BASES feels slippery
and turns blue litmus paper darker blue.
Hands on time!
Challenge Time
Answer the 5 FCAT like questions on your own!
