Properties and Changes of Matter
we gather information using our sense: touch= texture, taste, hearing any sounds it can make smell = odor, sight = appearances (color, size, shape, state, etc.)
How are your senses important for identifying physical properties of matter?
a physical property can be observed without changing the composition of the substance. A chemical property cannot be observed without changing the composition of the substance.How do chemical and physical properties differ?
How do chemical and physical properties differ?
chemical change
If a new substance is formed, what type of change occurred?
density
If you measure the mass of a unit of volume of material, what are you finding?
physical change
Is dissolving a physical or chemical change?
volume, mass, weight, size (=width, height, depth, length), possibly shape
List out examples of size-dependent physical properties
color, odor, density, solubility, state of matter, magnetism ( =ability to attract a magnet), melting/freezing/boiling points, possibly shape
List out examples of size-independent physical properties
melting,freezing, vaporization (boiling and evaporating), condensation, deposition, and sublimation All are physical changes.
Name the changes of states and what type of change they represent.
physical change (although it sweetens the taste, it's a mixture--not a new substance)
Name the type of change: sugar dissolves in tea
physical change
Name the type of change: alcohol vaporizes
chemical change
Name the type of change: bread molds
chemical change
Name the type of change: burning a candle
chemical change
Name the type of change: iron rusts
chemical change
Name the type of change: peaches rot
physical change
Name the type of change: sea shell breaks
chemical change
Name the type of change: sugar becomes alcohol
physical change
Name the type of change: wax melting
physical change
Name the type of change: you get a haircut
chemical change
Name the type of change: your homework burns (sad, sad day!)
chemical property
Name the type of property: ability to burn
chemical property
Name the type of property: ability to explode
chemical property
Name the type of property: ability to rot
chemical property
Name the type of property: ability to rust
chemical property
Name the type of property: ability to sour/spoil
chemical property
Name the type of property: ability to tarnish
True--it is a property of an object that demonstrates (which is an action) whether or not something is attracted to magnets
True or false: magnetism is a behavioral property.
deposition
What is the process/phase change of a gas changing directly into a solid?
chemical change
What type of change is burning paper?
physical change
What type of change is changing shape?
physical change
What type of change is melting?
two or more substances
When something dissolves, how many substances can be involved?
ability to burn, because if you burn something the chemical composition changes
Which of these is not a physical property of matter and why? density, mass, ability to burn, texture
The mass of the ash is less that that of the log. However, the "missing" mass is in fact not missing. A gas forms (carbon dioxide) when wood burns which goes into the air and this accounts for the "missing" mass.
Why does a log reduce to a smaller mass of ashes when the law of conservation of mass is universal?
chemical change
a change in which the composition of the substances changes and a new substance (or more) is formed
physical change
a change in which the form or appearance of matter changes, but not its composition
chemical property
a characteristic that cannot be observed without alternating the composition of the substance
physical property
a characteristic you can observe without changing or trying to change the composition of the substance
law of conservation of mass
states the total mass of matter is the same before and after a physical or chemical change