mr. pytleski 100 200 400 300 400 balancing chemical equations chemical reactions physical or...
TRANSCRIPT
Mr. Pytleski
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Balancing Chemical Equations
Chemical Reactions
Physical or Chemical
Controlling Chemical Reactions
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Row 1, Col 1
How do you know a chemical equation is balanced?
There is an equal # of atoms on both sides of the arrow
1,2
When a chemical equation breaksdown a molecule into
simpler parts, the reaction isknown as ________.
Decomposition
1,3
Give me an example of a physicalchange in a substance.
Any change that does not change the substance
1,4
Name one way the RATE of a chemical reaction can sped up.
Higher concentration, increase of surface area, increase temperature
2,1
WHOLE CLASSBalance the equation below
Sn + Cl2 ------- SnCl2
Sn + Cl2 = SnCl2
2,2
How many hydrogen and oxygen molecules are there on the ‘Product’
side of the following equation?
2 H2O2 2 H2O + O2
4
2,3
Smashing or pulling apart a marshmallow is an example of
what kind of reaction?
Physical
2,4
In our body there are proteinscalled ____ that help to speed up
reactions within our cells tocarry on life processes.
enzymes
3,1
In a chemical reaction, what is theTerm for the statement…’
‘Nothing is created ordestroyed with a chemical
Reaction.’
Law of Conservation of Mass
3,2
A __________ system is one where no matter is allowed to
enter or leave. (Example: A sandwich decaying in a sealed
Bag.)
closed
3,3
Combustion, electrolysis,oxidation (rusting), and tarnishing
are all examples of what kind of a reaction?
Chemical Changes
3,4
A material used to decreasethe rate of a reaction is called
a/an __________.(Also, give an example of one.)
Inhibitor (Food preservatives)
4,1
The materials that go into a chemical reaction are
known as the ___.
Reactants
4,2
The minimum amount of energyneeded to get a chemical reaction started is known
a the ______ energy.
activation
4,3
The study of matter and howmatter changes is called ______.
Chemistry
4,4
1 Extra Credit Point for the LUCKY TEAM who received this
question.
1 point Extra Credit
5,1
Balance the Equation
H2 + O2 -------> H20
2 H2 + O2 -------> 2 H20
5,2
A chemical reaction where energyis absorbed is called an ____
reaction.
endothermic
5,3
State TWO pieces of evidence indicating a chemical change.
State of matter change, color change, smell, temperature change…
5,4
What can be done to separate water into its reactants again?
(This means the water is changed back into
Hydrogen and oxygen (gases.)
Run electric current through them