In a reaction in which DH is positive, ________.
-Hproducts will always be greater than Hreactants-energy is released into the surroundings
-the change in enthalpy is negative-the products have less stored energy
1 atmosphere and 25°C ________
-are the conditions at which all laboratory experiments are conducted
-are the same as standard temperature and pressure (STP)
-are the standard conditions for measuring enthalpy change
-are the standard enthalpy change of a reaction
The study of heat flow and heat measurement is called ________.
calorimetercalorimetry
carbo-loadingcarbohydrate
20.The words calorimeter, calorimetry, and calorie are all derived from the Latin word calor, which means ______.
palenesscolor
energyheat
21.Every substance has a ________, which tells you how much heat is necessary to raise the temperature of 1 gram of the substance by 1 °C.
heat capacityheat
specific heatchange in enthalpy
22.The amount of heat needed to raise an object's temperature depends on its _________.
heat capacityboiling point
heatchange in enthalpy
23.________ has one of the highest specific heats of any substance.
oxygenalcohol
waterlead
24.A transfer of heat is detected by measuring a ________ change.
heatcarbon dioxide
combustiontemperature
25.On average, _______ supply 17 kJ/g (4 Cal/g) of energy.
fatscarbohydrates
wateroxygen
26.Reactions that absorb energy from the environment are _____.
exothermicergonomic
endogenousendothermic
27.Substances at a known temperature are placed in a calorimeter. The _________ change of the water due to the chemical reaction is measured. The ____ transferred in the reaction and the _______ change are then calculated mathematically.
energy, enthalpy, calorietemperature, heat, enthalpy
specific heat, energy, heatheat, heat capacity, temperature
Part 3
Calculate the correct answer. (Each question is worth two points)
28.A metal that has a mass of 70.2 g has a heat capacity of 1.854 J/°C. What is the specific heat of the metal?
2.641 x 102 kJ/g°C3.786 g/J°C
2.64 x 10-2 J/g°C1.446 x 102 kJ/g°C
29.9.31 g of NaNO3 were dissolved in 111 g of water in a calorimeter. The temperature of the water dropped from 25.00°C to 22.59°C. The specific heat of water is 4.184 J/°C. Calculate DH for the solution process.
DH = 7.99 kJDH = 4.68 kJ
DH = 0.976 kJDH = 1.21 kJ
30.622 J are required to raise the temperature of an ingot of iron from 25.00°C to 88.25°C. If the specific heat of iron is 0.447 J/g°C, what is the mass of the ingot?
22.0 g4.40 g
8.98 g111 g
13.The speed of an electromagnetic wave is ______.
proportional to its frequencyinversely related to its amplitude
always the sameimpossible to measure
14.Light exhibits characteristics of ______.
wavesparticles
both waves and particlesneither waves nor particles
15.Ultraviolet rays have __________ than visible light.
shorter frequencies and higher wavelengthshigher amplitudes and shorter frequencies
longer wavelengths and lower frequencieshigher frequencies and shorter wavelengths
16.De Broglie postulated that there is a mathematical relationship between the mass and velocity of a moving particle and the particle's _______.
motionamplitude
wavelengthcharge
17.When radiation is absorbed by a hydrogen electron, the hydrogen changes its ground state to _______.
an excited statea lower state
another atomthe nucleus of the atom
18.When exposed to a flame, neon gas ______.
emits neon green lightemits red light
absorbs red lightemits heat but no light from the visible spectrum
19.The greater the mass of a particle, the _______.
smaller its amplitudesmaller its wavelength
smaller its frequencysmaller its momentum
20.All waves can be described in terms of their _______.
amplitude, spin, and wavelengthamplitude, wavelength, and velocity
frequency, wavelength, and velocitywavelength, frequency, and amplitude
21.Einstein postulated that light consists of ______, which are tiny quanta of energy that behave like particles.
electronsradons
photonsgammas
22.The phenomenon in which electrons are ejected from the surface of a metal when that metal is exposed to light is called the _________.
photoelectric effectpiezoelectric effect
electromagnetic effectbutterfly effect
23.Intensity is a measure of the _______.
amount of energy in a photon of lightspeed of a photon of light
brightness of lightcolor of a photon of light
24.6.6262 x 10-34 J·s is ________.
Avogadro's numberPlanck's constant
Schrödinger's catthe speed of light
25.The wavelength of an electromagnetic wave _________.
is equal to its frequency divided by the speed of lightis equal to the speed of light divided by it's frequency
is equal to its frequency multiplied by Planck's constantis equal to its energy divided
-Hproducts will always be greater than Hreactants-energy is released into the surroundings
-the change in enthalpy is negative-the products have less stored energy
1 atmosphere and 25°C ________
-are the conditions at which all laboratory experiments are conducted
-are the same as standard temperature and pressure (STP)
-are the standard conditions for measuring enthalpy change
-are the standard enthalpy change of a reaction
The study of heat flow and heat measurement is called ________.
calorimetercalorimetry
carbo-loadingcarbohydrate
20.The words calorimeter, calorimetry, and calorie are all derived from the Latin word calor, which means ______.
palenesscolor
energyheat
21.Every substance has a ________, which tells you how much heat is necessary to raise the temperature of 1 gram of the substance by 1 °C.
heat capacityheat
specific heatchange in enthalpy
22.The amount of heat needed to raise an object's temperature depends on its _________.
heat capacityboiling point
heatchange in enthalpy
23.________ has one of the highest specific heats of any substance.
oxygenalcohol
waterlead
24.A transfer of heat is detected by measuring a ________ change.
heatcarbon dioxide
combustiontemperature
25.On average, _______ supply 17 kJ/g (4 Cal/g) of energy.
fatscarbohydrates
wateroxygen
26.Reactions that absorb energy from the environment are _____.
exothermicergonomic
endogenousendothermic
27.Substances at a known temperature are placed in a calorimeter. The _________ change of the water due to the chemical reaction is measured. The ____ transferred in the reaction and the _______ change are then calculated mathematically.
energy, enthalpy, calorietemperature, heat, enthalpy
specific heat, energy, heatheat, heat capacity, temperature
Part 3
Calculate the correct answer. (Each question is worth two points)
28.A metal that has a mass of 70.2 g has a heat capacity of 1.854 J/°C. What is the specific heat of the metal?
2.641 x 102 kJ/g°C3.786 g/J°C
2.64 x 10-2 J/g°C1.446 x 102 kJ/g°C
29.9.31 g of NaNO3 were dissolved in 111 g of water in a calorimeter. The temperature of the water dropped from 25.00°C to 22.59°C. The specific heat of water is 4.184 J/°C. Calculate DH for the solution process.
DH = 7.99 kJDH = 4.68 kJ
DH = 0.976 kJDH = 1.21 kJ
30.622 J are required to raise the temperature of an ingot of iron from 25.00°C to 88.25°C. If the specific heat of iron is 0.447 J/g°C, what is the mass of the ingot?
22.0 g4.40 g
8.98 g111 g
13.The speed of an electromagnetic wave is ______.
proportional to its frequencyinversely related to its amplitude
always the sameimpossible to measure
14.Light exhibits characteristics of ______.
wavesparticles
both waves and particlesneither waves nor particles
15.Ultraviolet rays have __________ than visible light.
shorter frequencies and higher wavelengthshigher amplitudes and shorter frequencies
longer wavelengths and lower frequencieshigher frequencies and shorter wavelengths
16.De Broglie postulated that there is a mathematical relationship between the mass and velocity of a moving particle and the particle's _______.
motionamplitude
wavelengthcharge
17.When radiation is absorbed by a hydrogen electron, the hydrogen changes its ground state to _______.
an excited statea lower state
another atomthe nucleus of the atom
18.When exposed to a flame, neon gas ______.
emits neon green lightemits red light
absorbs red lightemits heat but no light from the visible spectrum
19.The greater the mass of a particle, the _______.
smaller its amplitudesmaller its wavelength
smaller its frequencysmaller its momentum
20.All waves can be described in terms of their _______.
amplitude, spin, and wavelengthamplitude, wavelength, and velocity
frequency, wavelength, and velocitywavelength, frequency, and amplitude
21.Einstein postulated that light consists of ______, which are tiny quanta of energy that behave like particles.
electronsradons
photonsgammas
22.The phenomenon in which electrons are ejected from the surface of a metal when that metal is exposed to light is called the _________.
photoelectric effectpiezoelectric effect
electromagnetic effectbutterfly effect
23.Intensity is a measure of the _______.
amount of energy in a photon of lightspeed of a photon of light
brightness of lightcolor of a photon of light
24.6.6262 x 10-34 J·s is ________.
Avogadro's numberPlanck's constant
Schrödinger's catthe speed of light
25.The wavelength of an electromagnetic wave _________.
is equal to its frequency divided by the speed of lightis equal to the speed of light divided by it's frequency
is equal to its frequency multiplied by Planck's constantis equal to its energy divided