An unknown mass of each of the following substances, initially at 24.0°C, absorbs 1930J of heat. The final temperature is recorded as indicated. Find the mass of each substance.
a. Pyrex glass (Tf=55.1°C)
Express your answer using two significant figures.
m=____________g
b.sand (Tf=62.1°C)
Express your answer using two significant figures.
m=____________g
ethanol (Tf=44.0°C)
water (Tf=32.0°C)
Express your answer using two significant figures.
m=___________g
A 32.9g iron rod, initially at 21.9°C, is submerged into an unknown mass of water at 62.9°C, in an insulated container. The final temperature of the mixture upon reaching thermal equilibrium is 59.6°C.
What is the mass of the water?
Express your answer to two significant figures and include the appropriate units.
m=
m=____________g
Consider the following generic reaction: A+2B?C+3D, ?H = 101kJ . Determine the value of ?H for each of the following related reactions:
a. 3A+6B?3C+9D
?H = kJ
b. C+3D?A+2B
?H = kJ
c. 1/2C+3/2D?1/2A+B
?H = kJ
Calculate the wavelength of each of the following frequencies of electromagnetic radiation.
103.5MHz (typical frequency for FM radio broadcasting)
Express your answer using four significant figures.
?1 = m
1090kHz (typical frequency for AM radio broadcasting) (assume four significant figures)
Express your answer using four significant figures.
?1 = m
835.6 MHz (common frequency used for cell phone communication)
Express your answer using four significant figures.
?3 = m
A heat lamp produces 23.0 watts of power at a wavelength of 6.7µm .
How many photons are emitted per second? (1 watt = 1 J/s)
Express your answer using two significant figures.
N = s-1
Calculate the de Broglie wavelength (in pm) of a hydrogen atom traveling 445m/s .
Express your answer with the appropriate units.
? =
An electron traveling at 2.6×105m/s has an uncertainty in its velocity of 9.25×104m/s .
What is the uncertainty in its position?
Express your answer with the appropriate units.
?x =
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