Structure of matter
Temperature and gas laws
Heat and temperature
1 st law of thermodynamics
Anything for 1A
100
What is atomic number? How do we denote it?
The number of protons in nucleous is called the atomic number of an element and is represented by Z.
100
Convert 120 °C to Fahrenheit scale!
248
100
What is thermal equilibrium?
Two objects, having the same temperature, are said to be in thermal equilibruim.
100
Give definitions for three types of system! (open, closed, isolated)
A closed system means there is no matter transfer between the system and its surroundings. For an isolated system neither matter nor energy is transferred between the system and surroundings. An open system allows both matter and energy transfers.
100
Sing a song!
you get 100 pt!!!
200
What is Atomic mass number?
Atomic mass number is the sum of the number of neutrons and protons.
200
A metal dish is heated from 40°C to 560°C. What is the temperature change on the Celsius and Kelvin scales?
520 both in C and K
200
What is specific heat?
The amount of energy that is required to raise the temperature by 1 C
200
The internal energy of a system increases by 100 J, when it absorbs 40 cal heat. What is the work done by the system on the surroundings?
67.36 joules
200
S U L I F A with teacher!
you get 200 pt!
300
How many water molecules are there in 7.2 kg of water? (Molar mass of water, M(H2O)=18 g/mole)
2.4*10^23
300
The volume of a gas increases by 30 % when its temperature is increased by 99 K, at constant pressure. What is the initial temperature of the gas?
330 K
300
How much heat is needed to vaporize 2 kg of water at 100 C? (hint: Use latent heat of water)
4520000 joules
300
A gas expands slowly against a constant pressure of 400 kPa, doing 200 J work during the expansion. What is the volume change of the gas?
0.5 lt
300
Pointing to a man in a photograph, a woman said, "His brother's father is the only son of my grandfather." How is the woman related to the man in the photograph?
his sister)
400
What is difference between energies of solid and liquid states of matter?
In a solid: average kinetic energy of molecules < |average potential energy of molecules| In a liquid: Average. kinetic energy of molecules = |Average potential energy of molecules|
400
Suppose long steel rod 300 m in lenght! The temperature of this rod was changed from -20 C to 560 C. Find its final lenght! (linear exp coefficient for steel is 12*10^-6 )
302 m
400
How much heat is needed to increase the temperature of 2 kg of water from 30 C to 40 C?
83680 joules
400
32 g of helium gas is heated from 25 ºC to 250 ºC, at a constant pressure. What is the work done by the helium gas during the heating process? (M(He)=4 g/mole)
14958 Joules
400
what is horse power?
unit of power, equal to 735.5 watts
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