Thermochem Test Review Question Preview (ID: 19265)
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Endothermic reactions always raise in temperature
a) True
b) False
c)
d)
A reaction does not start with less energy than it in ends with
a) True
b) False
c)
d)
In an exothermic reaction, the system loses energy in the form of heat
a) True
b) False
c)
d)
Endothermic reactions lose energy to the surroundings
a) True
b) False
c)
d)
Change in temperature is not a chemical property
a) True
b) False
c)
d)
Energy is given off to the environment
a) True
b) False
c)
d)
Which of the following is not a type of energy?
a) acidic
b) potential
c) chemical
d) kinetic
What is chemical energy?
a) potential energy stored in bonds
b) energy from fire and explosions
c) energy used when turning on a metal burner
d) energy used by a roller coaster going down hill
What is heat Energy?
a) the amount of thermal energy in something
b) how warm or cold something is
c) what our bodies give off to other people
d) measured in degrees Celsius
What happens to energy when things happen?
a) energy is transferred or conserved
b) sometimes we waste our energy
c) it goes away
d) when things happen we “use up our energy”
Which of the following is not a way energy is transferred?
a) concentration
b) conduction
c) convection
d) radiation
What sign does ∆H have in exothermic reactions?
a) negative
b) positive
c) neutral
d) none of these
What sign does ∆H have in endothermic reactions?
a) negative
b) positive
c) neutral
d) none of these
What is the definition of enthalpy?
a) The quantity of heat required to raise the temperature of a sample of a substance one degree Celsius
b) Energy that transfers from one object to another because of a temperature difference between them
c) Change in heat content for a reaction at constant pressure
d) The unavailability of a system’s thermal energy to do work
Given the following thermochemical equation: 2NH3 + 4H2O 2NO2 + 7H2 ΔH= -142.5 kJ/mol, how much heat is released from the reaction of 20 g of H2O?
a) -99.0 kJ
b) -6.85 kJ
c) -39.5 KJ
d) + 99.0 kJ
16. 25.0 g of mercury is heated from 25°C to 155°C, and absorbs 455 joules of heat in the process. Calculate the specific heat capacity of mercury.
a) 0.32 J/g0C
b) 0.14 J/g0C
c) 0.056 J/g0C
d) 0.297 J/g0C
A 0.3 g piece of copper is heated and fashioned into a bracelet. The amount of energy transferred by heat to the copper is 66,300 J. If the specific heat of copper is 390 J/g 0C, what is the change of the copper's temperature?
a) 487 C
b) 602 C
c) 587 C
d) 566 C
18. What mass of water will change its temperature by 3 0C when 525 J of heat is added to it? The specific heat of water is 4.18 J/g 0C
a) 40.8 g
b) 41.9 g
c) 32.4 g
d) 18.6 g
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