Matter
Phases
Changes
Heat/Energy
100
What is the definition of matter?
Anything that has mass and takes up space.
100
During melting, what is happening to the temperature?
it remains the same
100
what is the difference between chemical and physical changes?
chemical changes change the elemental make up of the substance, physical changes the substance remains the same
100
How much heat is required to raise the temperature of 50.0 g of water by 10.0°C?
2090J
200
What is the difference between a pure substance and a mixture?
pure substances are in fixed ratios, pure substances can't be separated by physical means
200
What phase change occurs when a solid turns directly into a gas? gas to solid?
sublimation, deposition
200
When sugar dissolves in water, is it a chemical or physical change? Explain your reasoning.
Physical, sugar still remains sugar
200
If it takes 33900J of energy to convert water to steam, how many grams of water was heated?
15g
300
Name 5 diatomic elements
Br I N Cl H O F
300
Compare the particle arrangement and motion in solids, liquids, and gases.
most motion gas least motion solid
far apart gas, close together solid
300
Describe the difference between an element, a compound, and a mixture. Give an example of each.
element can't be broken down any further- anything on the periodic table
compound is 2(+) elements bonded together and can't be separated by physical means, fixed ratio
mixture- not a fixed ration, homogenous or heterogenous
300
Name 4 different types of energy
thermal, potential, nuclear, kinetic, chemical, mechanical
400
A mixture of salt and water is homogeneous. Describe one method to separate the two and explain why it works
evaporation
400
What is happening to entropy?
increasing
400
What is specific heat capacity?
The amount of heat/energy required to raise the temperature of one unit one degree Celsius
400
Why doesn't the temperature increase during a phase change, while it is being heated?
The energy is being used to separate the molecules.
500
Describe distillation
separation of solutions by boiling points
500
What happens to entropy, Kinetic Energy and Potential energy as a liquid turns to a solid.
entropy and PE decrease
KE stays the same
500
give examples of mixtures that can be separated through, filtration, evaporation and distillation
sand and water, salt water, alcohol and water
500
A 15.0 g sample of water at 32°C is heated to steam. Calculate the total energy absorbed after all the water has turned to gas.
38163.6