Observing Chemical Change
Describing Chemical Reactions
Controlling Chemical Reactions
Miscellaneous
100
What are the two types of properties of matter
physical and chemical
100

What is the ratio of carbon to oxygen in the chemical formula CO2

1:2

100
This is the minimum amount of energy needed to start a chemical reaction.
activation energy
100

Balance MgCl2 + Na2S--> NaCl + MgS

 MgCl2 + Na2S--> 2NaCl + MgS

200
Cutting paper in half would be a....?
physical change
200

What does the arrow in the equation mean?

yields or reacts to form

200

Catalysts do what to the rate of chemical reactions?

Double: Name a biological catalyst.

Catalysts increase the rate of reaction.

Double: enzyme

200
Boiling water is an example of what kind of change?
Physical
300
Energy is released as heat in a......?
exothermic reaction
300
This law states that during a chemical reaction, matter is not created or destroyed.
Conservation of mass
300
Chewing up your food to aid in your body's digestion is an example increasing what?
surface area
300

Balance Na + Cl2 --> NaCl

2Na + Cl2 --> 2NaCl

400

In the equation 2H2+O2 =>2H2O, H2 and O2 are known as the....?

reactants

400
A fish bowl is an example of what kind of system?
Open system
400
Decreasing temperature does what to the rate of the chemical reaction?
decrease
400
Matter is trapped in what sort of system?
closed
500

In a ________________, more energy is required to break bonds of the reactants that is released from the products.

endothermic reaction

500

What type of chemical reaction is represented by this example?

2Cu2O + C -> 4Cu + CO2

Replacement

500
_____ is the amount of substance in a given volume.
concentration
500

What are the 3 observable changes that prove a chemical reaction has occurred?

Formation of a precipitate, formation of a gas, or color change
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