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Chapter 2: Chemical Bonds and Compounds
Elements Combine to Form
Compounds
Chemical Bonds Hold Compounds
Together
Ionic/Covalent Bonds Terms
100 100 100 100
200 200 200 200
300 300 300 300
400 400 400 400
500 500 500 500
Most substances around us are known as _____________.
Compounds
The atoms of different elements are held together in compounds by
__________ _________.
Chemical Bonds
How do the properties of a compound compare with the
properties of the elements that make it?They are often quite different. For
example, water is made of 2 hydrogen atoms and 1 oxygen atom. At room temperature, H
and O are both colorless, odorless gases, and they remain gases
down to extremely low temperatures. Water, however, is
a liquid at temps up to 100 degrees Celsius and a solid below
O degrees Celsius.
Why is the ratio of atoms in a chemical formula so important?
Different ratios of elements indicate
different compounds.
Which ratio correctly depicts NO2 ?
A.2:1B.1:1C.1:2
D.None of the above
C. 1:2
What type of charge does an atom’s nucleus contain?
Explain why.
Positive charge b/c only protons (+) and neutrons (no charge) are contained in the
nucleus
What are formed when atoms gain or lose electrons?
Ions
Using your periodic tableWhat type of compound is Potassium
Bromide (KBr)?
Ionic Compound—why??
True or False. In a covalent bond, the atoms usually form
regular-shaped (lattice) structures.
False; ionic bonds.
What are two of the three forms of the element carbon that your
textbook refers to?
1. Diamond- hardest natural substance, useful for cutting other substances, and made entirely of
carbon. 2. Graphite- dark, slippery component of pencil
“lead,” and form two-dimensional layers. 3. Fullerene- contains large molecules, one type
is shaped like a soccer ball.
In a covalent bond, two ________ are bonding to form
a covalent compound.
Nonmetals
What are being stolen in an ionic bond?
Electrons
Which of the following is NOT a property a metal?
A.They are good conductors of electricity
B.They are good conductors of heatC.They are NOT easy to bend
D.They are shiny
C. They are NOT easy to bend
In this particular bond, electrons are shared equally.
Covalent
What is at least ONE property of a metal?
1. Conduct electricity well2. Conduct heat well3. Easily pounded/shaped/bent
It is describing the number of atoms that particular element contains in
that compound.
What does a subscript tell us when written in a chemical
formula?
What is a metallic bond?
A bond in which electrons are shared equally among the atoms of a metal.
A molecule is a group of atoms held together
by ______ bonds.
Covalent
Please list at least 3 types of bonds.
Chemical bonds are what hold atoms together in compounds. Chemical bonds can effect the compound’s properties.
1.Ionic bonds2.Covalent Bonds
3.Polar Covalent Bonds4.Metallic Bonds
Using your periodic table, please determine if C2H6O (ethanol) if it is a
covalent or ionic compound.
Covalent Compound