What answer should be reported, with the correct number of significant figures,

Question

What answer should be reported, with the correct number of significant figures, for the following calculation? (249.362 + 41)/63.498 A) 4.573 B) 4.6 C) 4.57277 D) 4.57 E) 4.5728 Which of the following represent isotopes? A:^46 _21 X B:^46 _22 X C:^44 _21X D:^48 _23 X A) C and D B) A and D C) A and C D) A and B How many protons (p) and neutrons (n) are in an atom of magnesium-26? A) 14 p, 12 n B) 12 p, 46 n C) 12 p, 14 n D) 26 p, 12 n Convert 5 mu m to meters. A) 5 times 10^-3 m B) 5 times 10^-9 m C) 5 times 10^6 m D) 5 times 10^-6 m Identify a cation. A) An atom that has lost an electron. B) An atom that has lost a neutron. C) An atom that has gained a neutron. D) An atom that has gained an electron.

Explanation / Answer

16)B, First do the addition and round to the least number of significant figure. Then divide and round off to the least significant figure.

17)C. Isotopes have same atomic number but mass number

18)C. 12 protons( Z= 12) # neutrons = mass number -# protons= 14

19)D, I micro = 10^-6

20)A, losing electron will give net positive charge

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