11. Which atom has the largest radius? A) Ga C) Rb B) K D) Br 12. Which bond is
ID: 104923 • Letter: 1
Question
11. Which atom has the largest radius? A) Ga C) Rb B) K D) Br 12. Which bond is the most polar? A) C-C C) c-C B) C-F D) C-N 13. Write a balanced chemical equation for the reaction of acetone (C HO) with oxygen (O2) to form carbon dioxide (CO2) and water (HO). A) C3H6O + 4 O2 3 CO2 + 3H0 C) 6CsHsO + 802 6 CO2 + 6 H2O 14. A balloon that contains 0.500 L of helium at 25 °C is cooled to 11 °C, at a constant pressure. What volume does the balloon now occupy? A) 0.477 L C) 0.525 L B) 1.1 L D) 0.22L 15. Which cylinder at STP will contain the greatest number of gas particles? A) a 5.0-L cylinder of nitrogen B) a 5.0-L cylinder of neon C) a 5.0-L cylinder of helium D) All of the cylinders above contain the same number of gas particles. 16. How many iron atoms are in 0.550 mol of Fe Os? A) 3.31 x 1023 iron atoms C) 6.02x 103 iron atoms B) 1.83 x 10-24 iron atoms D) 6.62x 103 iron atoms 17. Which sample contains the largest number of molecules? A) 100 g of CH C) 100 g of CO2 B) 100 g of CBr D) 100 g of CHBrs PageExplanation / Answer
11) Rb has largest radius as radius increases down the group because number of shell increases and decreses as we move from lef to right as nuclear charge increases.
12) C-F is most polar because fluroine is more electronegative
13) answer is A .
14) 0.48
As ; V1/ T1 = V2/ T2
0.5/ 298 = V2 / 284
V2 = 0.48
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