1) How many total atoms are in the formula Al2(CO3)3? A) 1 C) 12 D) 9 E) none of

Question

1) How many total atoms are in the formula Al2(CO3)3? A) 1 C) 12 D) 9 E) none of the above 2) 2) Which among the following elements does NOT exist as a diatomic molecule in nature? A) neon B) hydrogern C) nitrogen D) fluorine E) none of the above 3) 3) Carbon monoxide is considered which of the following? A) ionic compound B) atomic element C) molecular element D) molecular compound E) none of the above 4) 4) What would the formula of diiodine pentasulfide be? A) 1255 B) 15S2 C) 14S9 D) 12S7 E) none of the above 5) 5) Carbon is considered which of the following? A) atomic element B) ionic compound C) molecular element D) molecular compound E) none of the above 6) 6) The name trisodium phosphate is incorrect for the compound Nag PO4 because A) this compound should be called trisodium monophosphate. B) you cannot use a prefix for the first element of an ionic compound C) the sodium has a negative 3 charge. D) you cannot use a prefix for the first element in a molecular compound. E) none of the above

Explanation / Answer

1)

There is 2 Al

There is 3 C

There is 9 O

total atom = 14

Answer: A

2)

Neon is noble gas and has complete octet

So, it can’t form diatomic molecule

Answer: A

3)

CO is a molecule for 2 non metals

2 non metals form covalent compound

Answer: D

4)

diiodine is I2

penta sulfide is S5

Answer: A

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