Distinguishing Elements, Compounds and Mixtures
Instructions
Complete and submit the following question.
Substances can exist as elements, compounds or mixtures.
Examine the diagrams below:
a. Divide diagrams 1 – 8 into the categories listed in the table below. Each category can be used once, more
than once, or not at all. (2)
Element
Mixture of
Elements
Compound
Mixture of
Compounds
Mixture of
elements and
compounds
b. Name ONE element shown: ……………………………………………………………………….………………(1)
c. Name ONE compound shown: …………………………………………………………………………….………(1)
Essential Vocabulary
Purpose:
The use of this language in your work when responding to questions and constructing texts demonstrates
your level of understanding of the content and skills of this topic.
Use the highlighter tool and the key provided to show:
Words I know and can use correctly in a sentence about the topic
Words I know or have heard of but could use not use them correctly in a sentence about the topic
Words I don’t know yet
Word / Term
Atom
Molecule
Element
Compound
Symbol
Formula
Chemical change
Law of conservation of mass
Law of conservation of energy
Collision Theory
Chemical reaction
Reactants
Products
Acid
Base
Salt
Carbonate
Notes
Corrosion
Decomposition
Neutralisation
Combustion
Precipitation
Precipitate
Temperature
Exothermic
Endothermic
pH
Indicator
Society
Elements, Compounds and Mixtures worksheet
1. Which of the boxes contains:
a) Molecules of an element?
b) Molecules of a compound?
c) Atoms of an element?
d) Do any of the boxes contain a mixture? Explain your answer.
2. Look at the following substances. Circle the elements and underline the compounds
a) Li
b) N2
c) CO
d)Cl2
e)S8
f)NaCl
3. How many elements make up each compound?
a) HCl b) CaCO3
c) HNO3
d) H2SO4
e) CH3OH
4. How many atoms are there in each of these molecules?
a) N2
b) CO2
c) O3 d) CH4
e) SO2
f) C2H4
5. Circle the molecule with the most atoms, in each pair;
a) HCl or POCl
b) NH3 or HNO3
c) C3H8 or C2H5OH
d) CH3COCH3 or C6H6
6. What is the formula for each molecules shown below
O
O
O
C
O
O
H
H
H
N
H
H