Phase changes
a substance absorbs energy from the surroundings is called this type of process.
What is an endothermic process?
This is the amount of energy required to raise 1 gram of a substance by 1°C.
What is Specific Heat?
A laboratory process that measures heat transfer in a physical or chemical process
what is calorimetry?
On a heating curve, the flat portions represent this occurring.
What is a phase change?
How much energy is absorbed when 2.00 moles of water melt?
Heat of Fusion= 6.01 kJ/mol
What is 12.02 kJ absorbed?
This phase change occurs when a liquid turns into a gas.
What is vaporization?
In the equation q=mcΔT, which variable is measured in Joules?
What is q?
According to the conservation of energy, energy cannot be created or destroyed, only this.
What is transferred?
During melting, the temperature remains constant because energy is being used to do this.
What is break intermolecular forces?
How much energy is released when 3 moles of water condense?
ΔHvap=40.7 kJ/mol
What is 122.1 kJ released?
Freezing is this type of process due to the movement of energy between system and surroundings.
What is an exothermic process?
A 25 g sample is cooled from 35°C to 20°C. ΔT = ____
What is -15 degrees celcius?
In a calorimetry experiment, the heat lost by the metal is equal to this.
What is the heat gained by the water?
During the sloped portions of a heating curve, this type of energy increases.
What is kinetic energy?
How many grams of ice can melt using 24.04 kJ of energy? ΔHfus=6.01 kJ/mol
What is 72.064 gram of water?
A sealed soda can is an example of this type of system because matter cannot enter or leave, but energy can.
What is a closed system?
What is Object A has a higher specific heat than Object B?
A 75.0 g sample of an unknown metal is cooled to 0.00 degrees Celsius in an ice bath and then placed into an insulated calorimeter containing 100.0 g of water at 25.0 degrees Celsius. If the final equilibrium temperature of the water and metal is 22.0 degrees Celsius. What is the q of the water?
During the flat portions of a heating curve, this type of energy increases.
What is potential energy?
How much energy in kilojoules is needed to vaporize 90.0 g of water?
What is 204 kJ absorbed?
Draw an LOL diagram to represent a a beaker of ice cubes that is heated to melting.
What is the correct diagram?
Calculate the heat absorbed when 50.0 g of water is heated from 22.0°C to 30.0°C.
What is 1670 J?
A 40 g metal sample absorbs 720 J of heat and increases in temperature from 20.0°C to 50.0°C. Find the specific heat.
What is 0.60 J/g°C?
A cooling curve differs from a heating curve because energy is being this by the substance.
What is released (or removed/lost)?
How many grams of steam condense when 325.6 kJ of energy are released?
ΔHvap=40.7 kJ/mol
Answer: What is 144.1 g?