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Element, Compound, & Mixtures

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by

Kimberly DeVivo

on 11 September 2015

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Transcript of Element, Compound, & Mixtures

Elements
Compounds
1. A substance in which there is only one type of particle (or molecule)
Pure Substances
Mixtures
Anything that has mass and takes up space.
Heterogeneous
Homogeneous
Pure Substance:
glass of distilled water
GOLD
Carbon dioxide
2. Particles of a pure substance are the same no matter where the substance is found
SOLID
GAS
LIQUID
Elements:
1. A pure substance that
cannot
be separated into a simpler substance by
physical
and
chemical
means.
2. Elements have a unique set of properties known as CHARACTERISTIC PROPERTIES
3. These properties classify elements as a METALS, NONMETALS, or METALLOIDS.
Compound:
1. A pure substance composed of 2 or more elements that react with each other CHEMICALLY to form a NEW substance
2. Compounds have their own unique set of properties which is different from the elements that they are formed from.
3. Elements join is a specific ratio according to their masses.
Examples:
Caffeine
2Na
+
Cl
2
2 NaCl
C H O
12
22
11
Mixtures:
3. Each item keeps its properties in the mixture and they can be
separated physically.
1. A combination of two or more pure substances that are
not chemically
combined.
2. No chemical change takes place
sugar water
milk
Lots of PULP
Heterogeneous:
1. If at least two of its particles (what it is made up of) are visible to the naked eye, even after shaking.
Two liquids such as water and oil
A liquid and solid: Water and Sand
EXAMPLES
Suspensions
Colloids
Solutions
Is it an...
Element

Compound
Mixture
Here We Go...
Element
LET'S PRACTICE
Oil and water
Chalk
Ocean
Copper
Silver
Tea
Kool Aid
Bleach
Mixture
Compound
Mixture
Element
Element
Mixture
Compound
Mixture
Matter
What are the subatomic parts of an atom?
energy level
electron
nucleus
proton
neutron
What is the difference between a compound and molecule?
Which one is
NOT a
Compound?
A
B
C
What is an isotope?
The Periodic Table
PLASMA
HAS A ZERO CHARGE
HAS A POSITIVE CHARGE
PROTONS + NEUTRONS= THE NUCLEUS
HAS A NEGATIVE CHARGE
WHERE ELECTRONS ARE FOUND
How to Draw a
BOHR DIAGRAM

1. Determine the element you are drawing
"OXYGEN"
2. Determine the number of
Protons, Neutrons, and Electrons
Oxygen:
P=
N=
E=
3. Determine how many energy levels.
QUESTION: In the
first energy level
you can only have
two electrons
. How many electrons can you have in the other energy levels?
4. Fill in electrons on the energy levels appropriately .
Oxygen
5. DONE
P=8
N=8
E=8
Oxygen
HINT: What's Different?
Lewis Dot Structures
1. Write the Chemical Symbol has the " Nucleus"
O
2. Fill in VALENCE Electrons ONLY. Do this clockwise around the "imaginary" box around the symbol of the element you are drawing.
Oxygen has how many valence electrons?
O
1
2
3
4
5
6
7
8
Oxygen's Lewis Structure
What is an ION?
Name the Element and is it an Isotope?
1
2
3
4
5
6
Practice
1
2
3
4
5
6
ANSWERS
An Ion is an atom with an extra charge
Atoms have an unequal number of protons and electrons resulting in a charged atom
protons > electrons = positive charge
protons<electrons = negative Charge

Examples:
Positive Ion
Negative Ion
P=3
N=4
P=9
N=10
Li
3
7
F
19
9
Hint:P + (-E) = Charge
What is the charge on these atoms?
What is a Bond?
An attraction between atoms
Caused by valence electrons (-) and atomic nuclei (+)
Why do atoms bond?
To complete outer electron level
To become more stable (happy)
1. IONic Bonding
TRANSFER of electrons
Formation of ions
Na + Cl NaCl
2. Covalent
Sharing of electrons
Forms neutral molecules
2
2
2
CO

2
Example:
Example:
3. Hydrogen
Occurs between or within molecules
Weak bond
4. Polar Covalent
Unequal sharing of electrons
Forms polar molecules
Not Him
Full transcript