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Properties & Changes
Chemical Equations
Chemical Reactions
Bonus Questions
100
A characteristic of a substance that can be observed without changing it into a new substance.
What is a physical property
100
A short, easy way to show a chemical reaction.
What is a chemical equation.
100
The minimum amount of energy needed to start a chemical reaction.
What is activation energy
100
Another name for chemical reaction is
What is chemical change
200
Any change that alters the form or appearance of a substance but that does not make the substance into a new substance.
What is a physical change
200
This is the number in a chemical equation that tells you how many atoms of the element are present
What is a subscript
200
A material that increases the rate of a chemical reaction.
What is a catalyst
200
DAILY DOUBLE! The 2 properties that matter can be described in
What is physical and chemical
300
A chemical reaction in which energy is absorbed in the form of heat
What is endothermic reaction
300
This type of system allows matter to enter or escape into the surrounding in a chemical reaction
What is an open system
300
A material used to decrease the rate of a reaction
What is an inhibitor
300
A chemical reaction in which energy is released in the form of heat.
What is exothermic reaction.
400
Give an example of a physical property
What is -color -boiling point -melting point -bending -hard/soft -density
400
This law states that in a chemical reaction matter cannot be created or destroyed.
What is the law of conservation of mass
400
What are the 2 main kinds of changes that you can observe when chemical reactions occur?
What is the formation of a new substance and a change in energy (heat).
400
The study of matter and how matter changes
What is chemistry
500
Give an example of a chemical property BESIDES flammability
What is -ability to tarnish or rust -reactivity to acid, water, oxygen
500
Every chemical or physical change in matter includes a change in _____________.
What is energy
500
Chemists can control the rate of a reaction by changing what 3 factors?
What is surface area, temperature, and concentration.
500
The wood burning in a fireplace does not disappear, but turns into gases in the air. This is an example of __________________________.
What is the law of conservation of mass