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Chemistry 3.1 and 3.2
Terms in this set (47)
The study of matter
Anything that has mass and takes up space.
Matter that has a uniform and unchanging composition.
Water and salt
________________ are examples of a pure substances.
Samples from different locations may have different compositions.
Why isn't sea water a substance?
Objects can be identified by their ___________.
Changing the sample's composition
A physical property is a characteristic that can be observed or measured without _________________.
_______________ have uniform and unchanging physical properties.
An element or a compound
A pure substance is either an _________________.
density, color, melting point
Examples of physical properties.
Extensive or Intensive
Physical properties can be described as either ________________.
the amount of substance you have
Extensive properties depend on ______________.
mass, length, volume
Examples of extensive properties.
____________________ are independent of the amount of substance you have.
color, odor, density
Examples of intensive properties.
combine with or change into one or more other substances
A chemical property is the ability or the inability of a substance to __________________________.
1.) Rusts 2.) no change in nitrogen
Describe two chemical properties of iron.
Every substance has a _____________ set of physical and chemical properties.
yes, properties depend on temp and pressure
Is it necessary to state the specific conditions when observing properties?
Vapor, reacts with many substances
Water's physical and chemical properties at temperatures greater than 100 ºC.
Density of water over 100 ºC
solid, liquid, gas, plasma
3 common states of matter
Where is plasma found on Earth?
Is the physical state of a substance a physical property?
shape and volume.
A solid is a form of matter that has its own definite _________ and _________.
tightly packed; heated
Solid particles are _________ and a solid expands slightly when _______________.
Does not; incompressible
A solid _____________ take the shape of its container and it is _________________.
Are all solids rigid and hard?
flows; volume; shape
A liquid is a form of matter that ______________, has a constant _____________ and takes the _______ of its container.
Liquid particles are _________ rigidly held in place and are ________ closely packed than solid particles.
Liquids are virtually _________________ and tend to ___________ when heated.
Particles can move past each other, and keep constant volume
What allows liquid particles to flow and take the shape of their container?
A gas is a form of matter that ____________ to conform to the shape of the container and fills the entire ___________ of its container.
very far apart
Gas particles are _____________ compared to liquids and solids.
Gases are easily ________________.
The words "gas" and "vapor" (should, should not) be used interchangeably.
A gaseous substance that is a solid or liquid at room temperature.
Without changing its composition
Physical changes are changes that alter a substance _____________________________.
cut, break, crumble
Examples of physical changes.
Changes in state or phase of matter are __________.
The _________________ and ________________ at which a substance undergoes a phase change are important physical properties.
melting and boiling points
The temperature and pressure at which a substance undergoes a phase change.
Are the boiling point and melting point intensive or extensive?
Can intensive physical properties help to identify substance ?
reaction; changing into new substances
A chemical change, also called a chemical ___________________, involves one or more substances ________________
The composition and properties of the substances formed in a chemical change ____________ the same as the substances present before the reaction.
An example of a chemical change would be iron reacting with oxygen to form _________.
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