Which one has similar properties to phosphorus ( )?
A. silicon (Si)
B. carbon (C)
C. oxygen (O)
D. arsenic (As)
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Air within a container is ( )
A. heterogeneous mixture
B. homogeneous mixture
C. an element
D. a compound
How many significant figures are there in 0.004010? ( )
A. 6
B. 3
C. 7
D. 4
The solubility of NaCl is 35.7 g/100 mL of water at 0 oC, and 39.12 g/100 mL of water at 100oC. A sample of 75 g NaCl was stirred overnight at 100oC with 200 mL water. Which statement is correct? ( )
A. The solution is unsaturated
B. The solution is saturated
C. The solution is supersaturate
D. It is hard to know from the conditions given
For a ClF4+ ion, how many valence electrons should be shown in the Lewis structure? ( )
A. 32
B. 33
C. 34
D. 35