Elements, Compounds and Molecules
Counting Atoms
Physical and Chemical Change
Miscellaneous
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1 2 3 4
Which picture best represents a compound?
4
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What does the coefficient in front of a chemical formula represent?
Number of Molecules present
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What are 3 examples of evidence that a chemical changed occurred?
New Substance, Unexpected Color Change, Energy(release or gain, unexpected temperature change), Formation of a solid (precipitate), Unexpected Odor Change, Gases Produced, pH Change
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A solid substance that forms when two liquids are combined and chemically react to form a new substance
Precipitate
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What is the difference between a Molecule and a Compound?
Molecule is made of more than one atom and a compound has two or more different atoms.
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How many atoms are in each of the Elements of 4NH4 ?
Nitrogen - N - 4
Hydrogen - H - 16
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Carrots cut into small pieces is a type of what kind of change?
Physical
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Physical or Chemical?
Chemical
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How many Elements are in this Chemical Formula?
NaOH
3
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In the formula Fe₂(SO₄)₃, how many total sulfur atoms are there?
3
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What type of change occurs when vinegar and salt are poured over a dark penny and it becomes lighter in color and shinier? What is your evidence?
Chemical Change
Evidence:
- Color Change: The penny changes from dark to lighter in color, indicating a chemical reaction has taken place.
- Formation of New Substances: The vinegar, which is acetic acid, reacts with the copper oxide on the surface of the penny, resulting in the formation of new substances, such as copper ions and possibly copper acetate.
- Shininess: The increased shininess suggests that the original tarnished layer has been removed, revealing the underlying copper, which is a different state than before the reaction.
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Which is not a compound?
H2O NaCl O2 CH3
O2
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What are the names of the Elements in NaHCO₃?
Sodium - Na
Hydrogen - H
Carbon - C
Oxygen - O
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How many hydrogen atoms are in CH3COOH?
4
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A car rusting in the rain is a what type of change?
Chemical
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What is the name of this Element?
W
Tungsten
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Is this an Element or Compound ?
NH3
Compound
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What is the total number of atoms in the molecule C₆H₁₂O₆?
24
(6 + 12 + 6)
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Which one is chemical and which is Physical?
Salt is added to ice and it melts
Sugar is heated until it turns black
Salt is added to ice and it melts - Physical
Sugar is heated until it turns black - Chemical
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An Elements Chemical Symbol must start with a what?
A Capitol Letter