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Chemical Reactions Review
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What happens to food molecules eaten by humans?
 
the atoms are rearranged through chemical reactions to make new substances
 
the atoms are used up by a chemical reaction to make energy
 
the atoms are change into new types of atoms through chemical reactions
 
the atoms are copied to produce more atoms through chemical reactions
Vinegar in the beaker is mixed with baking soda inside the balloon. The balloon immediately inflates. Why?
 
a chemical reaction has created a new substance that bubbles
 
a physical reaction has made the baking soda turn to gas
 
a physical reaction has turned the vinegar into gas
 
a chemical reaction happened but no new substances were formed
Sugar is heated until it carmalizes. How will students know a chemical change has happened?
 
Compare their solubility in water
 
Compare their tastes
 
Compare their volumes
 
Compare their state of matter
What type of change has occurred based on the chart shown? How do you know?
 
This is a chemical change because the solubility is different after mixing
 
This is a physical change because the masses are different after mixing
 
This is a physical change because the melting points are different
 
This is a chemical change because the melting points are different
Will the properties of Sample 1 and 2 be the same or different?
 
different because the groups have different numbers of atoms
 
the same because the atoms are the same
 
the same because they are both gases
 
different because there are more atoms groups in sample 1
Will the properties of these two samples be the same or different?
 
different because there are different types of atoms in each set
 
different because there are more atoms in Sample 2
 
the same because they are grouped into sets of 2
 
the same because each have a purple atom
How can you tell one substance from another?
 
different substances have different properties
 
different substances have different phase changes
 
all substances are in the same phase
 
all substances have the same boiling and melting point
This experiment shows a closed system. What will that tell us about the mass of the two reactants and the product?
 
the mass of the two reactants will be the same as the ending mass
 
the mass of the two reactants will be different than the ending mass
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