What is the heat of a system (in J) in which 5.35 grams of copper is raised from an initial temperature of 24.3°C to a final temperature of 92.4 °C? (S Cu = 0.385 J/ g°C) (3 pts)
1) (a) What is the heat of a system (in J) in which 5.35 grams of copper is raised from an initial temperature of 24.3°C to a final temperature of 92.4 °C? (S Cu = 0.385 J/ g°C) (3 pts)
(b) Is heat absorbed or given off? Explain what this means. (2 pts)
2) Label each of these processes as either endothermic or exothermic (CIRCLE) (0.5 pts each)
A) Freezing of water exothermic or endothermic
B) Combustion of butane (C4H10, lighter fluid) exothermic or endothermic
C) Photosynthesis (chlorophyll reacts with CO2, exothermic or endothermic
H2O, & absorbs energy producing glucose and O2)
D) Melting of ice exothermic or endothermic
3) When a particular metal is blasted with high-energy source, visible radiation is emitted. Calculate the energy (in joules) associated with these photons if the wavelength of the visible light is 528 nm. (4 pts)
4) Fill in the Blank (1 pt per blank)
(a) The _______________________________ states that no two electrons in an atom can have the same four quantum numbers.
(b) The heat measured in a Styrofoam cup system is called constant _______________ calorimetry.
(c) _______________________ states that when reactants are converted to products, the change in enthalpy is the same whether the reaction takes place in one step or in a series of steps.
(d) The vertical distance from the midline of a wave to its peak or trough is _________________________.
(e) The 1st law of thermodynamics states that energy is not _________________ or _________________, but can be transferred or transformed from one form or object to another.
(f) _________________________ are properties that are determined by the status of the system (its initial and final condition), regardless of how that condition was achieved. An example would be_________________.
(g) ___________________ is the transfer of thermal energy between two bodies that are at different temperatures.
(h) The __________________________quantum number represents whether an electron spin is pointed up or down.
(i) _____________________________ is a measure of thermal energy.
(j) A(n) ______subshell can hold up to 14 electrons and is 4-leaf clover shaped.
(k) _________________________________ is the energy stored within the collection of neutrons and protons in the nucleus of an atom.
(l) The ______________________________ of a substance is the amount of heat required to raise the temperature of a given quantity of the substance by 1°C.
5) (a) Using the given heats of formation(ΔH°f) , calculate the ΔH°rxn for the following reaction. (4 pts)
SiO2(s) + 4HCl(g) → SiCl4(g) + 2H2O(g)
ΔH°f [SiO2(s)] = -910.9 kJ/mol; ΔH°f [SiCl4(g)] = -657.0 kJ/mol; ΔH°f [HCl(g)] = -92.3 kJ/mol; ΔH°f [H2O (g)] = -241.8 kJ/mol
(b) Is this reaction endothermic or exothermic? Explain what this means. (1 pt)
6) Write the correct electron configuration for the following species. (6 pts)
(a) Cl
(b) Sb (entire configuration)
(c) Sr
BONUS (3 pts): Bad Joke or Not?
