Transcript Review - Net Start Class

Review
Week 6 CCA
October 3, 2013
Pure Substances
• A sample of matter that has definite
chemical and physical properties.
Elements
• pure substance that cannot be separated
into simpler substance by physical or
chemical means.
Compounds
Pure substance composed of two or more different
elements joined by chemical bonds.
– Made of elements in a specific ratio
that is always the same
– Has a chemical formula
– Can only be separated by
chemical means, not physically
Mixtures
• A combination of two or more pure
substances that are not chemically
combined.
• substances held together by physical forces,
not chemical
• No chemical change takes place
• Each item retains its properties
in the mixture
• They can be separated physically
Chem4kids.com
Mixtures vs. Compounds
http://www.bbc.co.uk/schools/ks3bitesize/science/chemistry/elements_com_mix_6.shtml
Properties of Matter
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Identify each of the following items as a mixture or a pure substance.
- If a mixture, identify as homogeneous or heterogeneous.
- If a pure substance, identify as a compound or an element.
Sample
Gold
Water
Italian Dressing
Milk
Cobalt
Coffee
Calcium Carbonate
Cake Batter
Type of Sample
Type of Mixture or Pure
Substance
Properties of Matter
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Identify the following properties as physical or chemical.
Property
Temperature
Bond Strength
Calorie Content
Mass
Density
Reactivity
Length
Melting Point
Physical Property
Chemical Property
Properties of Matter
• Identify the following properties as extensive or
intensive.
Property
Temperature
Bond Strength
Calorie Content
Mass
Density
Reactivity
Length
Melting Point
Extensive Property
Intensive Property
Methods of separating solutions
Tap water is not pure water. We can make it pure
through the process of __________. In this
process, the water is boiled, the steam is trapped
and condensed leaving pure H2O.
A solution of water and sodium chloride can be
separated by allowing all of the water to
______________.
A suspension could be separated by __________. In
this process, a substance spins rapidly allowing
the heavier particles to settle at the bottom of a
tube.
How many neutrons are in a Vanadium
- 51 atom?
Density
The formula to calculate density is ________.
If you are determining the density of a regularly
shaped object, the volume can be determined by
measuring ___________, ________, and
__________. To get the volume, you would
__________ the 3 numbers.
If you need to find the volume of an irregularly
shaped object, you need a _________ cylinder
and ________. To get the volume of the object,
you would take the final volume minus the
________ volume.
How would you calculate the volume
or mass of a substance when density is
given?
Mass = _____________ ( ) ______________
Volume = ___________ ( ) ______________
WRITE THE CORRECT FORMULA
iron (II) oxide
beryllium sulfide
tin (IV) bromide
aluminum flouride
The name of CuO is:
The name for Ca3N2 is:
. Using the periodic chart, list an element
with the stated number of valence
electrons
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A. 3
B. 5
C. 7
D. 8
The element mercury has the atomic number 80.
How many protons and electrons are in a neutral mercury atom?
a. 80 protons, 80 electrons
b. 160 protons, 80 electrons
c. 40 protons, 40 electrons
d. 80 protons, 0 electrons
Which of these describes a chemical change?
a. Frost disappears from a window in the morning.
b. decrease in temperature reduces the volume of a gas.
c. Soot is formed as a candle burns.
d. A cup of hot tea cools down.
What are the oxidation numbers?
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Group 1AGroup 2AGroup 3AGroup 4AGroup 5AGroup 6AGroup 7AGroup 8A-
Name the Group
• Elements from which group will form salts and
will combine in a 1:1 ratio with elements from
group 1A?
• What is the name of the group that contains
elements that are the least reactive?
• What is the name of the group that contains
metals that are the most reactive?
• Iron and copper are in the group called the
____________ metals.
Diatomic Molecules
• Name the 7 diatomic molecules:
Group A elements are called REPRESENTATIVE ELEMENTS
divided into 3 broad classes:
METALS
- have high electrical conductivity
- high luster when clean
- ductile (can be drawn into wires)
- malleable (can be beaten into thin sheets)
NONMETALS
- occupy the upper-right corner of the
periodic table
- they are non-lustrous and poor conductors
of electricity and are brittle
METALLOIDS
- elements that are intermediate
between metals and non-metals
(Ex. Silicon and Germanium)
Phase Changes