Types of Reactions
What happens in an exothermic reaction between a system and its surroundings?
What is Heat or energy is released from system to surroundings
At which stages of the phase change graph is there an increase in potential energy but not kinetic energy?
What is stage 2/ice melting & stage 4/water boiling
What is the formula used for calorimetry problems?
What is q=mcdeltaT
What is the first law of thermodynamics?
What is energy is never created or destroyed.
What does delta H stand for?
What is change in enthalpy (total heat content of a system )
Is steam condensing into water droplets on your mirror an exo or endothermic reaction?
What is an exothermic reaction.
going from -25 to 115 degrees C is how many calculation steps?
What is 5 steps
How do you go from J to kJ?
What is divide J by 1000
What is the second law of thermodynamics?
What is heat naturally flows from hot to cold
What is sublimation?
What is going straight from a solid to a gas
What does delta H mean if it is positive?
What is an endothermic reaction
What is happening in terms of molecular structure to water at 100 degrees C?
What is the IMFs are breaking and liquid water is turning into steam
What is the heat in J when 10g of water is heated from 50 to 78 degrees C
What is 1170 J
Which law of thermodynamics?
When you burn wood, the chemical energy stored in the wood is converted into heat and light energy. The total amound of energy remains the same.
What is the first law of thermodynamics
During deposition, does entropy increase or decrease?
What is decrease
N2 + O2 + 180.5 kJ → 2NO
Exo or endothermic?
What is endothermic
What is the amount of energy in kJ needed to heat 5g of H2O from -5 to 85 degrees C?
What is 3.5 kJ
What is the heat in kJ when 5g of Al are heated from 35 to 100 degrees C?
Al specific heat is 0.90
What is 0.293 kJ
Which law of thermodynamics?
A perfect crystal at absolute zero K would have 0 entropy
Define specific heat and it's units.
What is the amount of heat energy required to raise the temperature of 1 kilogram of a substance by 1 degree Celsius and J/g degrees C
Explain how a calorimeter works and measures?
What is a scientific instrument used to measure the amount of heat released or absorbed during chemical reactions, physical changes, or heat capacity. It works by measuring temperature changes in an insulated system, to calculate enthalpy changes, with results in Joules
What is the amount of energy in kJ needed to heat 7g of H2O from -10 to 115 degrees C
What is 21.44 kJ
A 32.5g sample of unknown metal is heated to 132 C & placed in a calorimeter containing 125g of water at 25C. After the metal cools, the final temp of metal and water is 27 C.
Calculate the specific heat of the unknown metal to identify it.
What is 0.306 J/gC
Which law of thermodynamics?
A hot cup of coffee left on a countertop will eventually cool down to room temperature. The heat energy from the coffee flows to cooler surroundings, increasing the entropy of the overall system.
What is the second law of thermodynamics
Define intermolecular forces and how they relate directly to phase changes.
What is the attractive and repulsive electrostatic forces that act between neighboring molecules or atoms. They relate because itermolecular forces act as the "sticky" connections holding molecules together in condensed phases (solid or liquid). Phase changes occur when thermal energy is added or removed, changing the ability of molecules to overcome these attractions.