5c changes of state

Question 1

what is specific heat capacity?

Answer 1

the energy required to change the temperature of an object by one degree C per kilogram of mass

Question 2

how do you investigate the changes of state?

Answer 2

• place ice cubes in the beaker
• place thermometer in beaker
• place the black on the tripod and gauze, slowly start to heat
• as beaker is heated take regular temp measurements
• continue whilst the substance changes state

the graph should show a flat region where the ice is melting

Question 3

what does heating a system do?

Answer 3

changes the energy stored within and raise its temperature or it will produce a change of state

Question 4

how does the heat get transferred to a substance without changing the temperature?

Answer 4

the thermal energy doesn’t contribute to the kinetic energy, instead its used to weaken the bonds between particles

Question 5

what does it mean if an object has a low specific heat capacity?

Answer 5

it heats up and cools down fast and the opposite is true

Question 6

practical specific heat capacity?

Answer 6

• place beaker on balance and press tare
• add water (250ml) and record the mass
• place immersion heater and thermometer in water
• connect the circuit, ammeter in series with power supple and immersion heater, and the voltmeter in parallel with the immersion heater
• record initial temp
• turn on power and start timer
• record voltage from voltmeter and current
• continue to record temp and the rest every minute
• repeat replacing water with things