Properties of Matter
A property that can be observed without changing a substance into any new substances
Physical Property
Breaks and/or creates bonds between atoms
Chemical change/reaction
The _________________ is the minimum amount of energy that must be added to start a chemical reaction.
activation energy
In a synthesis reaction, the products are _____ complex than the reactants.
more
In a chemical equation, the substances written on the right side of the arrow are called __________.
products
A property that can only be observed by changing a substance into new substances
Chemical Property
__________________ alter the form or appearance of matter without forming new substances.
Physical Changes
_______________ the surface area of a substance speeds up reaction times.
Increasing
The change in which ice absorbs energy and melts is a(n)
endothermic reaction
Substances that enter into a chemical reaction and undergo chemical changes are called
reactants
If you describe methane as a gas that easily catches fire, you are describing
A chemical property
The amount of matter in a chemical reaction ____________ changes.
never
(law of conservation of mass/matter)
A material used to decrease the rate of a chemical reaction is a(n)
Inhibitor
In chemical reactions, what does the principle of conservation of mass mean?
Matter is not created or destroyed.
Magnesium bromide is an ionic compound with the chemical formula MgBr₂. What does the "2" tell you?
There are two bromide ions for every magnesium ion.
A substances ability to dissolve in water is a _________ property
Physical
A precipitate is a(n) ______________ that forms from solution during a chemical reaction.
Solid
Chemicals that speed up reactions without being affected themselves are called
Catalysts
When matter can enter from or escape to the surroundings.
An open system reaction
In a chemical equation, numbers often appear in front of a chemical formula (coefficients). These numbers tell you the
number of molecules or atoms in each substance in the reaction.
The ability of certain metals to conduct electricity is a ___________ property
Physical
______________________ occur when existing bonds break and new bonds form.
Chemical changes/reactions
The _________________ is the amount of one material present in a given volume of another material.
concentration
A hand warmer is an example of a(n) __________________ reaction
exothermic
CaCO₃ represents a chemical __________
formula