Page 504 - Chemistry eBook

47 Given the incomplete equation representing a reaction:
2Na(s) 􏰂 2H2O(l) → 2Na􏰂(aq) 􏰂 2 _____ (aq) 􏰂 H2(g) What is the formula of the missing product?
(1) O2􏰁 (2) O2
(3
tions
Sample Regents Q
u
)
O
(4) OH
e
s
H
􏰁
48 Given the equation representing a reaction where the masses are expressed in atomic mass units:
hydrogen-2 􏰂 hydrogen-1 → helium-3 􏰂 8.814 􏰀 10􏰁16 kJ 2.014 102 u 1.007 825 u 3.016 029 u
Which phrase describes this reaction?
(1) a chemical reaction and mass being converted to energy (2) a chemical reaction and energy being converted to mass (3) a nuclear reaction and mass being converted to energy (4) a nuclear reaction and energy being converted to mass
49 Given the diagram representing a process being used to separate the colored dyes in food coloring:
Jan 2013 #Pap4er8
Drop of food coloring
Answer
P.S./Chem.–Jan. ’13 [7]
[OVER]
Start of process
End of process
Choice #3
Explanation: We k(n2o) weletchtroaltysitshis is a nuclear react(4i)ontitrbateiocnause this is the fusion example we are expected to recognize.
In a nuclear equation, mass is converted to energy.
Which process is represented by this diagram?
(1) chromatography (3) distillation
Red Beaker Pink
Water
503 © UNIT 12: NUCLEAR CHEMISTRY