2.1: Matter has observable properties. - Chemical Edition
2.1: Matter has observable properties. - Physical Edition
2.2: Changes of state are physical changes. Part I
2.2: Changes of state are physical changes. Part 2
2.3 Properties are used to identify substances.
100
DAILY DOUBLE!! Describe why the steps wool goes through to become a sweater are physical, not chemical changes.
They are changes to physical properties such as shape, volume, texture (shearing, spinning into yarn), and color (dyeing).
100
DAILY DOUBLE!! A rectangular box has a length of 10 cm, a height of 5 cm, and width of 2 cm. If the box has a mass of 1,000 g, what is the box's density?
1.) Find the volume. 10 cm x 5 cm x 2 cm = 100cm3
2.) Divide volume by mass 100cm3/10g
3.) Density = 10 g/cm3
100
Define boiling point.
The boiling point is a certain temperature that boiling can occur at.
100
Define freezing point.
It's the temperature at which a specific liquid becomes a solid.
100
Describe how MAGNETIC PROPERTIES can be used to identify a substance.
Some substances are attracted to magnets, but others are not.
200
Give three examples of chemical properties.
Examples of chemical properties can include:
combustibility, rusting, tarnishing, reacting with acid, etc.
200
Define density and give the equation for it.
Density is a measure of the amount of matter present in a given volume of a substance.
Density = mass/volume
200
Define boiling.
It is the process in which a liquid becomes a gas. It produces bubbles.
200
Define freezing.
Freezing is the process by which a liquid becomes a solid.
200
Describe how ELECTRIC PROPERTIES can be used to identify a substance.
Some substances conduct electricity better than others.
300
Define chemical properties.
They describe how substances can form new substances.
300
DAILY DOUBLE!! Give three examples of physical properties.
Examples include: color, shape, size, texture, volume, and mass.
300
Define evaporation.
It's the process by which a liquid becomes a gas. It usually occurs at the surface of a liquid.
300
Define melting point.
It is the lowest temperature at which a substance begins to melt.
300
Describe how DENSITY can be used to identify a substance.
You can compare the unknown substance with the densities of known substances.
400
Define a chemical change.
It's the change of one substance into another substance.
400
Define physical properties.
They are characteristics of a substance that can be observed without changing the identity of the substance.
400
Define condensation.
It's the process by which a gas changes its state to become a liquid.
400
Define melting.
Melting is the process by which a solid becomes a liquid.
400
Describe how HEATING PROPERTIES can be used to identify a substance.
Substances respond to heating in different ways so you can help identify substances using this information.
500
List at least two signs of a CHEMICAL CHANGE.
Signs of CHEMICAL CHANGE are: production of an odor, change in temperature, change in color, formation of bubbles, and formation of a solid.
500
Define a physical change.
It's a change in any physical property of a substance, not in the property itself.
500
Define sublimation.
It is the process in which a solid changes directly to a gas.
500
What is the melting point of ice?
It's at 0 degrees Celsius/32 degrees Fahrenheit
500
Describe how SOLUBILITY can be used to identify a substance.
It is the measure of how much of a substance dissolves in a given volume of a liquid. Different substances have different solubilities.