chapter 2: chemical bonds and compounds elements combine to form compounds chemical bonds hold...
TRANSCRIPT
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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
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Most substances around us are known as _____________.
Compounds
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The atoms of different elements are held together in compounds by
__________ _________.
Chemical Bonds
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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.
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Why is the ratio of atoms in a chemical formula so important?
Different ratios of elements indicate
different compounds.
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Which ratio correctly depicts NO2 ?
A.2:1B.1:1C.1:2
D.None of the above
C. 1:2
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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
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What are formed when atoms gain or lose electrons?
Ions
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Using your periodic tableWhat type of compound is Potassium
Bromide (KBr)?
Ionic Compound—why??
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True or False. In a covalent bond, the atoms usually form
regular-shaped (lattice) structures.
False; ionic bonds.
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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.
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In a covalent bond, two ________ are bonding to form
a covalent compound.
Nonmetals
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What are being stolen in an ionic bond?
Electrons
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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
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In this particular bond, electrons are shared equally.
Covalent
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What is at least ONE property of a metal?
1. Conduct electricity well2. Conduct heat well3. Easily pounded/shaped/bent
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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?
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What is a metallic bond?
A bond in which electrons are shared equally among the atoms of a metal.
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A molecule is a group of atoms held together
by ______ bonds.
Covalent
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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
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Using your periodic table, please determine if C2H6O (ethanol) if it is a
covalent or ionic compound.
Covalent Compound