UNIT 3.1 - Revisit
NAME:________________________________________
Per._________Date:____________________
Atoms, Elements, Compounds & Mixtures Revisit
Part I: Read the following information on atoms, elements, compounds and mixtures. Fill in the
blanks where necessary.
Atoms:
o There are three sub-atomic particles. The subatomic particle with a negative charge is the
________________. The subatomic particle with a ________________________charge is the proton. The
subatomic particle that does ______________ have a charge is called the ______________________.
o The __________________ of an element is the number of protons and neutrons in the nucleus.
o The __________________ ____________ is an average of the masses of all naturally occurring
isotopes of an element.
o To find the number of ____________________ in the atom, you must subtract the number of
protons from the atomic mass.
Elements:
o A pure substance containing only one kind of ____________.
o An element _____________ be separated into simpler materials (except during nuclear
reactions).
o Over 100 existing elements are listed and classified on the ____________________ ______________.
Compounds:
o A pure substance containing two or more kinds of _______________.
o The atoms are _________________ combined in some way. Often times (but not always) they
come together to form groups of atoms called molecules.
o Compounds ___________________ be separated by physical means. Separating a compound
requires a chemical reaction.
o The properties of a ___________________are different than the properties of the elements it
contains. It forms a new substance with new properties.
Mixtures:
o Two or more ________________ and/or _________________ NOT chemically combined.
o No reaction between substances.
o Mixtures can be uniform (called ________________________) and are known as solutions.
o Mixtures can also be non-uniform (called ________________________).
o Mixtures can be separated into their components by ________________ means.
o The properties of a ________________ are similar to the properties of its components.
Part II on
o Particles in a _______________________ settle out at the bottom of the container.
Back….
o Particles in a _______________________ do NOT settle out.
NAME:________________________________________
UNIT 3.1 - Revisit
Per._________Date:____________________
Part 2: Decide what each of the following items should be labeled as: elements (E), compounds
(C) or Mixtures (M). Write the letter X if it is none of these.
___Diamond (C)
___Air
___Krypton (K)
___Water (H2O)
___Ammonia (NH3)
___Wood
___Dry Ice (CO2)
___Sugar (C6H12O6)
___Sulfuric Acid (H2SO4)
___Bismuth (Bi)
___Alcohol (CH3OH)
___Salt (NaCl)
___Bronze
___Baking Soda (NaHCO3)
___Milk
___Gasoline
___Uranium (U)
___Pail of Garbage
___Energy
___Ink
___Titanium (Ti)
___Iron (Fe)
___Electricity
___Popcorn
___A dog
___Gold (Au)
___Pizza
___Concrete
Part 3: Match each diagram with its correct description. Diagrams will be used once.
A
B
C
D
___1. Pure Element – only one type of atom present.
___2. Mixture of two elements – two types of uncombined atoms present.
___3. Pure compound – only one type of compound present.
___4. Mixture of two compounds – two types of compounds present.
___5. Mixture of a compound and an element.
Part 4: Identify by name letters a – d.
a)_______________________________
b)_______________________________
c)_______________________________
d)_______________________________
What is the atomic number of this
element?_____________________
What is the name and symbol of this element?
_______________________________________
E
NAME:________________________________________
UNIT 3.1 - Revisit
Per._________Date:____________________
Atoms, Elements, Compounds & Mixtures Revisit
Part I: Read the following information on atoms, elements, compounds and mixtures. Fill in the
blanks where necessary.
Atoms:
o There are three sub-atomic particles. The subatomic particle with a negative charge is the
Electron . The subatomic particle with a Positive
subatomic particle that does
o The
Mass
o The
Atomic
NOT
charge is the proton. The
have a charge is called the Neutron
.
of an element is the number of protons and neutrons in the nucleus.
Mass is an average of the masses of all naturally occurring
isotopes of an element.
o To find the number of
Neutrons
in the atom, you must subtract the number of protons
from the atomic mass.
Elements:
o A pure substance containing only one kind of Atom .
o An element can’t
be separated into simpler materials (except during nuclear
reactions).
o Over 100 existing elements are listed and classified on the Periodic
Compounds:
o A pure substance containing two or more kinds of
elements
Table
.
.
o The atoms are chemically combined in some way. Often times (but not always) they
come together to form groups of atoms called molecules.
o Compounds
can’t
be separated by physical means. Separating a compound requires
a chemical reaction.
o The properties of a
Compound are different than the properties of the elements it
contains. It forms a new substance with new properties.
Mixtures:
o Two or more elements and/or
compounds NOT chemically combined.
o No reaction between substances.
o Mixtures can be uniform (called Homogenous ) and are known as solutions.
o Mixtures can also be non-uniform (called Heterogenous ).
o Mixtures can be separated into their components by physical
o The properties of a
o Particles in a
o Particles in a
means.
mixture are similar to the properties of its components.
Part II on
suspension
settle out at the bottom of the container.
Back….
colloid
do NOT settle out.
NAME:________________________________________
UNIT 3.1 - Revisit
Per._________Date:____________________
Part 2: Decide what each of the following items should be labeled as: elements (E), compounds
(C) or Mixtures (M). Write the letter X if it is none of these.
_E_Diamond (C)
_M_Air
_E_Krypton (K)
_C_Water (H2O)
_C_Ammonia (NH3)
_M_Wood
_C_Dry Ice (CO2)
_C_Sugar (C6H12O6)
_C_Sulfuric Acid (H2SO4)
_E_Bismuth (Bi)
_C_Alcohol (CH3OH)
_C_Salt (NaCl)
_M_Bronze
_C_Baking Soda (NaHCO3)
_M_Milk
_M_Gasoline
_E_Uranium (U)
_M_Pail of Garbage
_X_Energy
_M_Ink
_E_Titanium (Ti)
_E_Iron (Fe)
_X_Electricity
_M_Popcorn
_M_A dog
_E_Gold (Au)
_M_Pizza
_M_Concrete
Part 3: Match each diagram with its correct description. Diagrams will be used once.
A
B
C
D
_C_1. Pure Element – only one type of atom present.
_E_2. Mixture of two elements – two types of uncombined atoms present.
_B_3. Pure compound – only one type of compound present.
_A_4. Mixture of two compounds – two types of compounds present.
_D_5. Mixture of a compound and an element.
Part 4: Identify by name letters a – d.
Electron – negative
a)_______________________________
Neutron – no charge
b)_______________________________
Nucleus – mass of atom
c)_______________________________
Proton - positive
d)_______________________________
What is the atomic number of this
4
element?_____________________
What is the name and symbol of this element?
Beryllium - Be
_______________________________________
E