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Properties of Matter
n/a
48
Science
7th Grade
10/05/2010

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Term
"The characteristics of a substance that can be observed without changing the identity of the substance." This is the definition for what?
Definition
physical property
Term
What is the unit we commonly use for volume?
Definition
cm3  (centimeters cubed)
Term
Is the formation of bubbles a physical property or a chemical property?
Definition
chemical property
Term
If a book weighs 800 grams, what physical property am I describing?
Definition
mass
Term
"The measure of the amount of matter present in a given volume of a substance." This defines what?
Definition
density
Term
Which is more dense, a box full of lead or the same size box full of cotton balls?
Definition
box full of lead
Term
What is the formula for density?
Definition
density = mass/volume
Term
A baseball has a volume of 10cm3 and a mass of 20g, what is the density of the ball?
Definition
20g/10cm3 = 2g/cm3
Term
Is breaking a piece of clay in half a physical change or a physical property?
Definition
physical change
Term
If I break a piece of clay in half, name a physical property that I have changed?
Definition
size, shape, volume, or mass
Term
Scraping blue paint off of a painting, is this a physical change or a physical property?
Definition

physical change

 

Term
Chemical properties describe how substances can form ________ substances.
Definition
new
Term
The ability to burn is a chemical property. Name another?
Definition
the ability to rust, the ability to tarnish
Term
"The change of one substance into another substance." This defines what?
Definition
chemical change
Term
Give one example of a chemical change?
Definition
iron rusting, wood burning, eggs cooking, spoons tarnishing
Term
What are three signs of a physical change?
Definition
change in color, shape, size, taste, texture, the ability to bend, mass, volume, density
Term
What are the 3 states of matter?
Definition
solid, liquid, gas, (plasma)
Term
What is the process by which a solid becomes a liquid?
Definition
melting
Term
"The lowest point at which a substance begins to melt." This defines what?
Definition
melting point
Term
What is the melting point of ice?
Definition
32o Fahrenheit or 0o Celsius
Term
Freezing is the process by which a __________ becomes a solid.
Definition
liquid
Term
Touching an object that is "frozen" is always cold to the touch. True or false.
Definition
false
Term
The freezing point of a substance is the same as the ___________ of the substance?
Definition
melting point, water freezes at 32o F and ice melts at 32o F
Term
"The process by which a liquid becomes a gas. " This defines what?
Definition
evaporation
Term
Evaporation usually occurs where in a liquid?
Definition
At or near the surface
Term
Subtances have specific, or exact, temperatures at which they evaporate. True or False.
Definition
False. Water, for example, evaporates over a wide range of temperatures.
Term
What do you call it when a solid changes directly into a gas?
Definition
sublimation
Term
Name one example of sublimation.
Definition
dry ice (frozen CO2) turning into gas
Term
What must be produced for boiling to occur?
Definition
bubbles
Term
Are bubbles during the boiling process created at the top, in the middle , at the bottom, or all throughout the liquid?
Definition
all throughout
Term
What do we call the specific temperature at which a liquid boils?
Definition
boiling point
Term
Is it possible for something to boil at hundreds of degrees below zero?
Definition
yes, for example helium boils at -454 degrees below 0
Term
Gas changing to a liquid describes what?
Definition
condensation
Term
When you increase temperature you increase the _______ of a substance.
Definition
energy
Term
Are the clouds an example of condensation?
Definition
yes
Term
Which has more energy: a solid, a liquid, or a gas
Definition
gas. this is why the particles move around so quickly
Term
Condensation on a glass of iced tea occurs when warm water vapor in the air is cooled down by the surface of the cold glass. The water vapor slowly turns to what?
Definition
liquid water
Term
Define viscosity
Definition
How well a liquid flows.
Term
Describe two types of texture.
Definition
rough, smooth, greasy
Term
Is volume a physical property?
Definition
yes
Term
Mass is measured in what common unit?
Definition
grams
Term
What physical property would I use if I wanted to remove salt that is mixed with pepper? You cannot remove it by hand and you cannot run it through a filter.
Definition
solubility
Term
What word are we describing? "How well an electrical current runs through a substance."
Definition
conductivity
Term
What is a better conductor of electricity, metal or paper?
Definition
metal. metals are known for their good conductivity!
Term
What is a better conductor of heat, wood or copper?
Definition
copper. wood is a poor conductor of heat! It burns well but heat does not pass through wood well.
Term
Define the word "precipitate."
Definition
when two liquids combine to form a solid
Term
What physical property would be best used to separate small pieces of iron from a pile of dirt?
Definition
magnetism
Term
Why does water boil at a lower temperature in the Rocky Mountains?
Definition
less air pressure
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