Which of the following is insoluble in water at 25 C?
A) Mg3(PO4)2
B) Na2S
C) (NH4)2CO3
D) Ca(OH)2
E) Ba(C2H3O2)2
Question 2
Boric acid condenses to form tetraboric acid according to the equation ________.
A) 4H3BO3 (s) 2H2B2O7 (s) + 3H2O (g)
B) 2H3BO3 (s) HB2O2 (s) + 4H2O (g)
C) 4H3BO3 (s) HB4O8 (s) + 4H2O (g)
D) 2H3BO3 (s) H2B4O7 (s) + 3H2O (g)
E) 4H3BO3 (s) H2B4O7 (s) + 5H2O (g)
Question 3
How many total electrons are in the Li+ ion?
A) 2
B) 3
C) 4
D) 7
E) 8
Question 4
Crystalline solids differ from amorphous solids in that crystalline solids have ________.
A) appreciable intermolecular attractive forces
B) a long-range repeating pattern of atoms, molecules, or ions
C) atoms, molecules, or ions that are close together
D) much larger atoms, molecules, or ions
E) no orderly structure
Structure of water and ice
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Better land and water management and appropriate crop selection can help eliminate hunger