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Chemical Reactions CJ Review
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Wood burning is an example of which change? Why?
 
Chemical change b/c new properties were created when the wood burned
 
Chemical change b/c any time there is heat added to substances
 
Physical change b/c the ash can be turned back to wood
 
Physical change b/c the wood changed from a solid to a gas due to heat
Which beaker below is showing signs of a chemical change?
 
Beaker 2 because there are several changes happening and bubbles formed
 
Beaker 2 because everything is staying the same
 
Beaker 1 because there are several changes happening and bubbles formed
 
Beaker 1 because everything is staying the same
What is the easiest way to know if a chemical change has occurred?
 
the newly made substance will have different properties than the original
 
the newly made substance will have the same properties as the original
Oil and sodium hydroxide are combined to make soap and glycerol. The chart shows their solubility before and after.
 
This is a chemical change because the materials mixed have new solubility.
 
This is a chemical change because the materials were mixed with water.
 
This is not a chemical change because they are all liquids.
 
This is not a chemical change b/c dissolving in water is a physical change.
This is H2O. Water is made of this repeating atom group. What would water look like under a microscope?
 
repeating groups of the molecules seen above
 
the molecules seen above but they do not have to stay in groups
 
molecules of H and O that spread apart
 
all of the H and O atoms combined together
Why are these substances different?
 
the atoms that make them up are different so they have different properties
 
the atoms that make them up are the same so they have the same properties
Are these substances the same or different?
 
different
 
the same
Why does this picture show a chemical reaction has occurred?
 
the atoms are rearranged but the total atoms remain the same
 
the atoms are arranged the same way and the total atoms remain the same
 
there are the same number of atoms in pink and white
 
there are the same number of molecules in pink and white
What are the ending substances in a chemical reaction called?
 
products
 
reactants
 
atoms
 
molecules
What are the starting substances in a chemical reaction called?
 
reactants
 
products
 
atoms
 
molecules
Based on the atoms, are these substances the same? Will the properties be the same or different?
 
No, and they will have different properties
 
Yes, and they will have the same properties
 
Yes, and they will have different properties
 
No, and they will have the same properties
Ty described a substance as follows: pale blue, coarse and grainy and smells horrible. These are ___ of the substance.
 
properties
 
atoms
 
reactions
 
products
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