Mr. Pytleski 100 200 400 300 400 Balancing Chemical Equations Chemical Reactions Physical or Chemical Controlling Chemical Reactions 300 200 400 200.

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