System and Surroundings
Phase diagrams
Energy
Specific Heat
Rate of Reaction
100
What is a system?
What you are focused on
100
What is the transition phase from solid to gas?
Sublimation
100
This is defined as the ability to do work.
What is energy?
100
What does Cp represent in q = m x ΔT x Cp
Specific Heat
100
The ______ the concentration of the hydrochloric acid the more hydrochloric acid particles there are in a given amount of space.
higher
200
What is the surroundings?
Everything else but the system " so what you are not focused on"
200
What does the triple point of a substance mean?
Where all three phases for a substance can occur simultaneously/at the same time.
200
This is the name given to the energy of motion.
What is kinetic energy.
200
What is the change in temperature of an object whose initial temperature is 40 °C and reaches a final temperature of 65 °C?
15 °C
200
When a solid lump is cut into pieces, its total surface area ____________.
Increases
300
Define exothermic reactions. Define endothermic reactions.
Exothermic reaction: release heat energy
Endothermic reaction: absorb heat energy
300
Which part of the graph represents the gas state?
A
300
This is the name given to the energy of position.
What is potential energy?
300
Calculate heat:
m = 20 g, c = 4.18, ΔT = 5°C
must show work
418 J
300
As the temperature decrease the rate of reaction _______
decrease
400
Exothermic reactions release heat energy, so is q positive or negative?
negative
400
What is the transfer of energy an object has due to its motion?
Heat
400
This is the name for a type of energy that causes atoms to move quicker.
What is thermal energy or heat energy?
400
A 400 g solid is heated from 15°C to 35°C. The solid has a specific heat of 2.5 J/g·°C. Calculate the heat absorbed, q.
20,000 J
400
How can the chemical manufacturers make their products quickly and cheaply as possible?
by adding a catalyst.
500
If water warms up during a reaction, did the reaction absorb or release heat?
Released Heat.
500
Why do ice cubes left in the freezer for too long become smaller?
Because the ice is going through the process of sublimation, turning directly into water vapor.
500
What is the total potential and kinetic energy
of particles in an object.
What is thermal energy
500
A 400 g solid releases 8,000 J of heat as it cools. The solid’s specific heat is 2.0 J/g·°C. Its final temperature is 25°C. Calculate the initial temperature of the solid.
q = m * Cp * (Tfinal-Tinitial)
8000=400*2*(25-Tfinal) --> 8000=800*(25-Tfinal)
8000/800=800/800*(25-Tfinal)
10=25-Tfinal --> 10-25=-Tfinal --> 15°C = Tfinal
500
For a reaction to happen the collisions must be
Effective (have enough energy, with correct orientation)