When applying the first law of thermodynamics to a system, when is heat a positive quantity?
when the system does work
when the system has work done on it
when the system absorbs heat
when the system loses heat
when no work is done either on the system or by the system
Q.2.
The kind of heat transfer that travels through space in electromagnetic waves is ______________________.
insulation.
Radiation
Conduction
Convection
Q.3.
In physics, there is no such thing as
heat
cold
energy
temperature
Q.4.
The _____ Law of Thermodynamics says that heat always flows from an object with a higher temperature to an object of lower temperature naturally
Zeroth
First
Second
Third
Q.5.
DON'T RUSH, YOU HAVE TIME.Frying an egg on a skillet. Referring to the egg, would the Enthalpy change be positive or negative?
Skillet is absorbing heat energy from the egg. Absorbing energy is Endothermic. Endothermic has a positive Enthalpy
Egg absorbing heat energy from the skillet. Absorbing energy is Endothermic. Endothermic has a positive Enthalpy
Egg absorbing heat energy from the skillet. Releasing energy is Exothermic. Exothermic has a positive Enthalpy
Egg absorbing heat energy from the skillet. Releasing energy is Exothermic. Exothermic has a negative Enthalpy
Q.6.
The measure of average kinetic energy of all the particles within an object is called ____________.
temperature
conduction
radiation
heat
Q.7.
DON'T RUSH, YOU HAVE TIME. Water droplets condensing on the inside of a window on a cold day. Is this process exothermic or endothermic?
Gases condense to form liquids. Gases are moving faster than liquids, the air around the window has a higher temperature/kinetic energy. Releasing energy to get water droplets, which is is Exothermic
Gases condense to form liquids. Gases are moving faster than liquids, the air around the window has a higher temperature/kinetic energy. Releasing energy to get water droplets, which is is Endothermic
Gases condense to form liquids. Gases particles are moving slower than liquids. Releasing energy to get water droplets, which is is Endothermic
Gases condense to form liquids. Gases particles are moving slower than liquids. Releasing energy to get water droplets, which is is Exothermic
Q.8.
Exothermic reactions...
Absorb energy
Release energy
Release Color
Absorb Color
Q.9.
All phase changes (changing states) requires energy to be added or taken away.
True
False
Q.10.
Heat travels from the sun to the earth by the process of...
conduction
convection
radiation
insulation
Q.11.
When you place the metal in boiling water, heat flows from the _________ to the _______.
metal to the boiling water
bottom of the metal to the top half of the metal
bottom of the water to the top of the water
boiling water to the metal
Q.12.
Stored energy that results from the position or shape of an object is called...
Thermal
Potential
Kinetic
Gravitational
Q.13.
If the specific heat of water is 4,J/kg∙°C, how much heat is required to increase the temperature of 1.2 kg of water from°C to°C?
-80,371.2 J
44,938.6 J
80,371.2 J
112,575.9 K
Q.14.
A sample of iron receives 50.J of heat energy that raises the temperature of the iron 25.0°C. If iron has a specific heat of 0.J/g°C, what is the mass of the iron sample?
25 g
30 g
20 g
50 g
Q.15.
If I heat up 2 pans of water one hasmL in it and one has 1000mL. Which one heats up the fastest?
100 mL
1000 mL
They both heat up at the same speed
They cool down.
Q.16.
How many Joules of energy are required to makegrams of ice at 0 οC completely melt? The specific latent heat of fusion of ice isJ/kg
200 J
400 J
33,400 J
2,000,000 J
Q.17.
Particles (molecules) in a ______________________ have less energy than the other states of matter.
gas
solid
liquid
Q.18.
How much energy is required to completely boil awayofC water? Use C = 4.J/goC for water, and Hv =J/g.
56,484 J
339,000 J
395,484 J
385,484 J
Q.19.
One molecule of oxygen consists of __________ atoms of oxygen.
2
4
8
16
Q.20.
For the same maximum pressure and temperature,
Otto cycle is more efficient than Diesel cycle
Diesel cycle is more efficient than Otto cycle
Dual cycle is more efficient than Otto and Diesel cycles
Dual cycle is less efficient than Otto and Diesel cycles
Q.21.
Molecular volume of any perfect gas at×N/m² and 27°C will be
4.17 m3/kg mol
400 m3/kg mol
0.15 m3/kg mol
41.7 m3/kg mol
Q.22.
An actual engine is to be designed having same efficiency as the Carnot cycle. Such a proposition is
Feasible
Impossible
Possible
Possible, but with lot of sophistications
Q.23.
What does the "U" stand for the formula ∆U = Q + W
Heat
Temperature
Work
Internal energy
Q.24.
H2 + 2 C + N2 + 270.3 kJ --> 2 HCNIs this reaction endothermic or exothermic?
Endothermic
Exothermic
Q.25.
In which of the following systems is entropy increasing?
Putting together a puzzle
Putting books on a shelf
Breaking a plate
Filling a jar of salt
Q.26.
How can energy be transferred from a cool object to a warm object?
Work must be done
Increase thermal energy
Use convection
Q=mTC
Q.27.
The 1st Law of Thermodynamics says that temperature exists
True
False
Q.28.
Which situation best represents convection?
Heat from a campfire
A hot air balloon taking off
Touching a hot piece of metal
Getting sunburned
Q.29.
The handle of a metal spoon warms up when it is placed in a hot bowl of soup because of
Convection
Conduction
Radiation
insulation.
Q.30.
A molecule consisting of one atom is known as
Mono-atomic
Di-atomic
Tri-atomic
Poly-atomic
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