Density
anything that has mass and takes up space
Matter
What are the units for each variable in the specific heat formula?
Q = Joules
m = grams
c = J/goC
T = oC
This results in a new substance and is permanently changed
What is a Chemical change?
Particles in this state of matter are loosely packed and slide past each other
What is a liquid?
Liquid --> solid
Freezing
As pressure increases, volume _________. This is __________ Law.
Decreases; Boyle's
the amount of matter something has
Mass
Mass = 100. g
Specific Heat = 4.184 J/goC
Initial temperature = 25oC
Final Temperature = 37oC
Find Q.
5020.8 J or 5.0 x 103 J
A change in matter that doesn't create a new substance
What is Physical change?
This is the simplest form of matter that has a unique set of properties.
Element
Looking at the phase change diagram for H2O, what phase of matter exists at 50o C and 0.8 atm?
Liquid
Convert 273 kPa to atm.
2.69 atm
Mass = 25.0 g
Density = 2.71 g/mL
Volume = ?
9.23 mL
If the temperature of 34.4 g of ethanol increases from 25 °C to 78.8 °C, how much heat has been absorbed by the ethanol? The specific heat of ethanol is 2.44 J/(g·°C).
4516 J or 4500 J
Chemical, intensive physical, or extensive physical: Magnetivity, Conductivity, and Boiling point
Intensive physical property
X X X X X X
Y Y Y Y Y Y
If X and Y are both elements, this sample is best classified as:
Heterogeneous mixture
Looking at the phase change diagram for H2O, what is the critical temperature?
373.99 o C
A balloon is filled with 350 mL of helium in the morning when the temperature is 18.0° C. By noon the temperature has risen to 32.0° C. What is the new volume of the balloon?
367 mL or 0.367 L
A graduated cylinder is filled with water to a level of 30.0 mL. When a piece of copper is lowered into the cylinder, the water level rises to 42.4 mL. If the density of the copper is 8.9 g/cm3, what is its mass?
110.36 g
A substance (specific heat = 0.667 J/goC) releases 1000. J of heat energy while undergoing a temperature decrease of 15.0 °C. What is the mass of the substance?
100. g
Chemical, intensive physical, or extensive physical: volume, mass, and temperature
Extensive physical properties
This type of matter can only be separated by chemical means.
A compound
Looking at the phase change diagram for CO2, what process is occurring at -78oC, 1 atm?
Sublimation or deposition
4.5 L of gas in a piston at a pressure of 0.98 atm are compressed until the volume is 2500 mL. What is the new pressure inside the piston?
1.8 atm
A student has a rectangular block. It is 4 cm wide, 3 cm tall, and 2.5 cm long. It has a mass of 300 g. Calculate the density of the block.
10 g/cm3
Suppose that 2686 Joules of heat are transferred to a 49.0 gram sample of an unknown material, with an initial temperature of 13.0 °C. What is the specific heat of the material if the final temperature is 69.5 °C?
0.970 J/goC
Chemical, intensive physical, or extensive physical: flammability, corrosiveness, acidity
Chemical properties
This is a separation technique best used to separate an insoluble solid (like sand) from water.
Filtration
Looking at the phase change diagram for H2O, what phase of matter exists at 110oC and 0.5 atm?
Gas/vapor
A helium balloon with an internal pressure of 1.00 atm and a volume of 3.50 L at 30.0° C is released. What volume will the balloon occupy at an altitude where the pressure is 562 mmHg and the temperature is –10.0° C?
4.11 L