Chem 4 (matter 2) Flashcards
Reactivity is the likelihood of
A substance to undergo a chemical reaction
Flammability
Whether a substance will burn when exposed to a flame
Combustibility is a measure of
How easily a substance will burn in oxygen
If you can identify properties of a substance without changing it. That substance is a _ property
Physical
The changes that matter experiences are classified as either _ or _
Physical
Chemical
A physical change is any alteration to the _ of a substance (3)
Size
Shape
State
State of a substance is (3)
Solid
Liquid
Gas
In a physical change, the final changes take place without
Altering the substance’s composition
Changes take place without altering molecular composition means
Final substance made of same matter as before the change
Example of physical change keeping same molecular structure
Ice melts to water (solid/liquid)
A chemical change occurs when matter changes into a _ and has a _
New substance
New chemical property
Chemical changes do alter the
Molecular make up of a substance
In a chemical change, final substance is not made of
The same matter as before the change
Chemical change example _
Log burns into ash and gases
You cannot change ash back into
A solid log
You can tell if a chemical change has taken place if there is a change in _
Color
Change of color example
Apple out of the refrigerator and turns brown
You can tell if a chemical reaction has taken place if there is a change in (o)
Odor
Change in odor definition
Food rotting
Chemical change undergone when there is formation of a
Gas
_ shows that gas has formed
Bubbles
Example of two substances mixed to create gas
Vinegar and baking soda
Precipitate is a _ formed during a chemical reaction
New solid
A chemical change has happened when there is a formation of
A solid
You can tell that a chemical change has taken place when there is a change in
Energy
Change of energy is a chemical reaction that can be in the form of _ that releases energy
Heat and/or light
Exothermic is
A physical or chemical reaction that releases heat and energy
An example of an exothermic reaction
Making ice cubes
Endothermic reaction definition
A physical or chemical reaction that absorbs heat and/or energy to complete its reaction
Example of endothermic reaction (2)
Boiling water
melting ice cubes
Boiling an egg is a _ change
Chemical change
