Physical Properties
What is a physical property?
A property that can be observed without a substance changing its identity.
Give an example of a physical change
Many correct answers
Two materials needed for this lab were?
Rock
Graduated Cylinder
Water
Triple Beam Balance
What is the name of the International System of measurement that all scientists use?
SI Units
What is one signal that a chemical reaction is happening?
Color change, smoke, fire, explosion, etc.
Is ice melting at 32 degrees F an example of a physical property? Why or why not?
Yes, even though the water changes form, its chemical identity does not change.
What are the three most common phases of matter, and what changes for a sample of matter to move between them?
Solid, liquid, gas
Thermal energy added or removed.
A triple beam balance measures what?
Mass
Kilogram, mole, Kelvin, and meter are all examples of what?
Base Units
Chemical change, we can see the color of the metal change as it is slowly eaten away by the air and water.
Name four different physical properties you might observe in a piece of matter.
Color, density, malleability, solubility, others.
What is STP?
Standard Temperature and Pressure
(0 Degrees Celsius and 1 atmosphere)
The process by which we found the volume of the rocks we used.
Water Displacement
Define Compound (or Derived) units
A Unit of Measurement that is created by combining one more more base units together.
How is a chemical property different than a physical property?
Physical properties can only be observed when the identity of a substance does not change. Chemical properties require a chemical change (reaction) to be observed.
I measure the density of a rock and get 2.4 g/mL. I then cut the rock in half. What is the new density?
2.4 g/mL
What does it mean for a substance to dissolve?
How can density be used to identify a rock
Each type of rock has the the same density because it is a physical property.
1.21 Gigawatts represents what?
1.21 million (1,210,000) watts of power
An inert substance is placed in water. What do you expect to happen?
Nothing
I have a sample of a pure element that does not conduct electricity well. It is a gas a room temperature. That gas is less dense than the air around it, and is clear and colorless. What might this element be?
Hydrogen or Helium
Define the triple point
The exact pressure and temperature where a substance can exist as a solid, liquid and a gas.
Show a completed density calculation given the following information:
A cubic piece of mater with a length of 2cm and a mass of 16kg
d=m/v
d=16kg/8cm3
d=2kg/cm3If I took a Newton (Kgm)/s2 and multiplied it by a unit of length, which Compound Unit would I create?
Joule (Energy)
Where on the periodic table would I find the most reactive elements?