12. How many electrons are in a neutral atom of chromium-53? 13. There are three
ID: 567511 • Letter: 1
Question
12. How many electrons are in a neutral atom of chromium-53? 13. There are three naturally occurring isotopes of Carbon. They differ in the number of c) nuelear charge d) protons a) neutrons b) atomic number 14. Balance this equation: 15. Balance this equation 16. Balance this equation Al + Fe,04 Al2O3 + Fe 17. A negatively charged ion is called a(n): a) anion b) catione) neutron d) klingon 18. The formula for iron (II) sulfide is: a) Fess b) Fe2(SO4)3 c) Fe2Ss d) Fes 19. Name the binary compound CroOs 20-21. Given the following isotopes and fractional abundance calculate the mass tope mass 62.930 ance 0.6909 tope 2: mass-64.928 abundance = 0.309Explanation / Answer
12.
Neutral atom of chromium-53 has atomic number 24. Atomic number of atom represents number of electrons in the given atom. Therefore, number of electrons in neutral atom of chromium 53 are 24.
Hence, correct answer is 24.
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13.
Isotopes are the atoms of elements having same number of electrons and protons but different number of neutrons.
Therefore, naturally occurring isotopes of carbon have same atomic number, nuclear charge and number of protons. Only difference is the number of neutrons.
Hence, correct answer is a) neutrons.
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14.
PCl5 reacts with H2O to form H3PO4 and HCl. Since, H3PO4 contains four oxygen atoms, coefficient of H2O must be four. Changing coefficient of HCl to five, balances the equation. The final balanced equation is written as follows:
PCl5 + 4 H2O -----------> H3PO4 + 5 HCl
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15.
Reaction of C3H8 with oxygen results in formation of CO2 and H2O. Numbers of carbon atoms in C3H8 are three. Therefore, increase coefficient of CO2 to three and coefficient of H2O to four. Number of O2 should be 5. The final balanced equation is written as follows:
C3H8 + 5O2 -------------> 3CO2 + 4H2O
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16.
Reaction of Al with Fe3O4 results in formation of Al2O3 and Fe. The final balanced equation is written as follows:
8Al + 3Fe3O4 -------------> 4Al2O3 + 6Fe
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17.
Negatively charged ion is called as anion. Therefore, correct answer is a) anion.
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18.
Valence of iron in iron(II) sulphide is two and that of sulphur is also two. Therefore, a molecule of iron(II) sulphide will contain one Fe atom and one S atom.
Hence, formula of iron(II) sulphide is FeS
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19.
In the binary compound Cr2O3, valence of Cr is three. Therefore, it is named as chromium (III) oxide.
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