test3tro - Practise Exam Chapter 3 1. The atomic weight of...

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Practise Exam Chapter 3 1. The atomic weight of phosphorus is 30.974 u . What is the mass of a phosphorus sample which contains 0.585 moles of phosphorus atoms? A) 17.3 g B) 18.1 g C) 22.3 g D) 26.5 g E) 34.2 g 2. What is the correct name for the compound S 2 Cl 2 ? A) disulfur chlorate B) disulfur dichloride C) disulfur dichlorine D) sulfur(I) chloride E) sulfur(II) chlorine(II) 3. The correct formula for the compound formed from strontium ion and chromate ion is A) SrCrO 3 B) SrCrO 4 C) Sr 2 CrO 4 D) Sr(CrO 4 ) 2 E) Sr 2 (CrO 4 ) 3 4. A compound contains carbon, hydrogen, and nitrogen as the only elements. A 9.353 g sample of the compound contains 5.217 g of carbon and 1.095 g of hydrogen, the remainder being nitrogen. From this data, after determining the percent composition, by weight, what is the calculated empirical formula for the compound? A) C 2 H 5 N B) C 3 H 5 N C) C 3 H 6 N D) C 3 H 7 N E) C 4 H 9 N 2 5. What is the correct name for the compound Na 2 O? A) disodium oxide B) sodium oxide C) sodium(I) oxide D) sodium peroxide E) sodium superoxide Page 1
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6. Consider the atoms of 26 12 Mg and 27 13 Al . Both of these species have the same A) number of electrons B) mass C) number of neutrons D) atomic mass number E) number of protons 7. The species shown below which has 24 neutrons is A) 52 24 Cr B) 55 25 Mn C) 24 12 Mg D) 45 21 Sc E) 51 23 V 8. Consider the atoms of 65 Cu and 65 Zn. Both of these atoms have the same A) number of electrons B) mass C) number of neutrons D) atomic mass number E) number of protons 9. Naturally occurring silver consists of two isotopes 107 Ag, 106.905092 u 109 Ag, 108.904757 u A meteorite (or more properly, an extra-terrestrial object) which was retrieved from the
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test3tro - Practise Exam Chapter 3 1. The atomic weight of...

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