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What is the formula of the compound formed between Ca2+ and PO33-?

Carbon tetrachloride was used as a dry cleaning agent until it was recognized that long-term exposure caused negative effects to the liver and kidneys. Which formula would be named carbon tetrachloride?  

What is the charge of the ions formed by group 7A elements?  

What is the ion symbol of the oxide ion?  

Which element can be classified as a metal with variable charge?  

Which roman numeral correctly completes the name of the compound CrO?  

How many nonbonded electron pairs (lone pairs) are in the Lewis structure below?

Using the compound IF7,  a) Is this ionic or covalent?  b) What is the name? Answer both parts.  

Is the graph shown a function? [answer]  

For the graph shown. State the range in interval notation.