Multiple Choice
When calcium reacts with sulfur the compound formed is ________.
A) Ca2S2
B) Ca3S2
C) CaS
D) CaS2
E) Ca2S3
Correct Answer:

Verified
Correct Answer:
Verified
Q16: Which element is found in Period 2
Q17: Which species below is the chromate ion?<br>A)Cr<sub>2</sub>O<sub>7</sub><sup>2-</sup><br>B)CrO<sub>4</sub><sup>2-</sup><br>C)CH<sub>3</sub>COO<sup>-</sup><br>D)CO<sub>3</sub><sup>2-</sup><br>E)None
Q18: In the symbol below,x is _. <img
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Q20: The correct name for HClO<sub>3 </sub>is _.<br>A)hydrochloric
Q22: An unknown element is found to have
Q23: Which combination of protons,neutrons,and electrons is correct
Q24: 87 pm is the same as _
Q25: Which pair of atoms constitutes a pair
Q26: Potassium forms an ion with a charge