Chem 120 Exam 1 Study Guide
Questions and Answers
What is the difference between extensive and intensive properties? - -An
extensive property depends on the amount of matter; an intensive property
depends on the type of matter. Mass and volume are extensive properties.
Color and hardness are intensive properties.
- Celsius to Fahrenheit - -9/5C+32
- Difference between molecular and ionic compounds - -Molecular= non-
metals only
Ionic= metals and non-metals
- Fahrenheit to Celsius - -5/9(F-32)
- Celsius to Kelvin - -C+ 273.15
- Atomic Theory - -1. Element composed of microscopic, indivisible spheres
2. Atoms of the same type= identical
3. Atoms combine in simple whole number ratios
4. The numbers and kinds of elements in a compound are constant
5. Atoms are neither created nor destroyed (conservation of mass)
- Why is temperature
an intensive property? - -The temperature of a system in thermal
equilibrium is the same as the temperature of any part of it. If the system is
divided, the temperature of each subsystem is identical.
- How do you turn an
extensive property (like mass) into an intensive one (like density)? - -Divide
by amount= extensive/extensive
- Give one example of a homogeneous solution (uniform appearance and
composition throughout.) and one example of a heterogeneous
solution (visibly different substances or phases) - -Homogeneous= pure
water, white vinegar
Heterogeneous= oil and water, ice cubes in a drink
- How many significant figures are in the following measurements?
a. 5120 mg
b. 0.00006099 L
c. 2100 cm
d. 1.0000 m
Questions and Answers
What is the difference between extensive and intensive properties? - -An
extensive property depends on the amount of matter; an intensive property
depends on the type of matter. Mass and volume are extensive properties.
Color and hardness are intensive properties.
- Celsius to Fahrenheit - -9/5C+32
- Difference between molecular and ionic compounds - -Molecular= non-
metals only
Ionic= metals and non-metals
- Fahrenheit to Celsius - -5/9(F-32)
- Celsius to Kelvin - -C+ 273.15
- Atomic Theory - -1. Element composed of microscopic, indivisible spheres
2. Atoms of the same type= identical
3. Atoms combine in simple whole number ratios
4. The numbers and kinds of elements in a compound are constant
5. Atoms are neither created nor destroyed (conservation of mass)
- Why is temperature
an intensive property? - -The temperature of a system in thermal
equilibrium is the same as the temperature of any part of it. If the system is
divided, the temperature of each subsystem is identical.
- How do you turn an
extensive property (like mass) into an intensive one (like density)? - -Divide
by amount= extensive/extensive
- Give one example of a homogeneous solution (uniform appearance and
composition throughout.) and one example of a heterogeneous
solution (visibly different substances or phases) - -Homogeneous= pure
water, white vinegar
Heterogeneous= oil and water, ice cubes in a drink
- How many significant figures are in the following measurements?
a. 5120 mg
b. 0.00006099 L
c. 2100 cm
d. 1.0000 m
