Phase Changes
Solid to liquid is called..
Melting
__________________ describes the way a substance reacts when it changes.
Chemical Properties
Color change, odor change, change in temperature, and gas being released are all __________ changes.
Chemical
Hydrogen (H) is an example of a(n) ________.
Element
True or false: an element can be broken down into smaller parts.
Liquid to solid is called..
Freezing
__________________: characteristics of substances that can be observed without changing the substance.
Physical Properties.
A _________ is a result of _________ making a chemical reaction.
product, reactant
True or false: there are only elements of the Periodic Table.
True.
_____________ and ______________ are both pure substances.
Compounds, elements.
Liquid to gas is called..
vaporization/evaporation
Malleability, conductivity, and density are all examples of __________ properties.
Physical.
True or false: exothermic is a chemical reaction that absorbs energy.
False, endothermic.
A mixture is..
A combination of 2 or more pure substances.
Solutions are always ____________ mixtures.
Homogeneous.
True or false:
Sublimation is gas to solid.
False.
Flammability, toxicity, and radioactivity are all examples of ______________.
Chemical Properties.
A precipitate is when..
liquid turns to a solid (like cottage cheese)
True or false: H2O is a compound.
True
The 4 types of mixtures are..
Heterogenous, homogeneous, immiscible and miscible.
Frost is an example of..
Deposition
How can you determine density and what type of property is it?
Density is a physical property determined by mass divided by volume.
Is rusting exothermic or endothermic?
Exothermic
All _______ are molecules but not all molecules are __________.
Compounds
What is the difference between a colloid and a solution?
A colloid is thick, heterogeneous, cloudy, and can't be filtered.
A solution is homogeneous, thin, dissolvable, and clear.