PCM. Changes in Matter Benchmark 1

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PCM. Changes in Matter Benchmark 1
Explain chemical changes in terms of the
breaking of bonds and the rearrangement of atoms
to form new substances.
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Key concepts
Atom Molecule Ion Bond Reactant Product
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Key concepts
Conservation of mass Rate of reactiontemperature
, surface area, concentration Specific chemical
reactionsburning paper or wood, rusting iron,
formation of sugars during photosynthesis
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Real-world contexts
Examples of chemical changes
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Question Menu
Question One
Question Two
Question Three
Question Four
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Which of the following is a correct chemical
equation?

• NaOH HCl ? NaCl H2O
• NaOH HCl ? Na2Cl HO2
• NaOH HCl ? NaCl 2H2O
• NaOH HCl ? 2NaCl H2O
• NaOH HCl ? Na2Cl2 H2O2

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For all incorrect answers the exact type of
atom as well as the exact number of those atoms
must be equal on both sides of the arrow. The
number and type of atoms must be the same in the
reactants and products!!
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In a chemical reaction, chemicals called ________
are combined to form new compounds called________

• Atoms molecules
• Ions bonds
• Reactants products
• Electrons protons
• Ionic covalent

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Which reaction would be the fastest? One which
has

• High concentrations of reactants, high
  temperature, catalysts
• Low concentrations of reactants, high
  temperature, catalysts
• High concentrations of reactants, low
  temperature, no catalyst
• High concentrations of reactants, high
  temperature, no catalyst
• Low concentrations of reactants, low temperature,
  no catalyst

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In nature, the rate of a reaction depends on a
variety of things. The more reactants there are
the more often collisions will take place
speeding the reaction. The higher temperatures
will cause molecules to move faster causing more
collisions which speeds a reaction. If a
catalyst is present, it manages the reaction
and has the ability to make reactions happen more
quickly
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Which one of the following is NOT an example of a
chemical reaction?

• Burning paper
• Rusting iron
• Formation of sugars during photosynthesis
• Explosion of TNT
• Boiling water into steam

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A. Burning paper results in new products being
made, smoke, carbon dioxide so its a chemical
reaction
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B. Rusting iron results in iron oxide being made
from iron, thus a new product is made therefore
its a chemical reaction
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C. In photosynthesis, sugars are made from
carbon dioxide and water. A new product is
made, sugar, so therefore this is a chemical
reaction
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D. In an explosion of TNT, the TNT no longer
exists, new products are made therefore its an
example of a chemical reaction
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