When Phosphate Rock, Ca₃(PO₄)₂(s), Is Converted to Phosphorus

question 48

Multiple Choice

When phosphate rock, Ca₃(PO₄) ₂(s) , is converted to phosphorus,

• A) one of the products of the reaction is water.
• B) sulfuric acid is added to generate insoluble calcium sulfate.
• C) hydrogen is used to reduce the phosphate to phosphorus.
• D) silica is added to form a calcium silicate slag.
• E) oxygen must be added to prevent reaction of P₄.

Explain the adoption and importance of checks and balances in the American government system.

Discuss the key issues and resolutions at the Constitutional Convention, particularly regarding the formation of the legislative branch.

Describe features and implications of plans proposed at the Constitutional Convention (Virginia Plan, New Jersey Plan).

Understand the policies and significance of the Northwest Ordinance of 1787.

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