A 15.0 mL volume of a gas is at 25.0 degree C. What is the volume if the constan

Question

A 15.0 mL volume of a gas is at 25.0 degree C. What is the volume if the constant pressure? a) 30.6 mL b) 46.3 mL c) 16.3 mL d) 71.3 mL e) none of these When an electron in an atom moves from the ground state to an excited state a) no change in energy takes place b) light is emitted c) energy is emitted d) energy is absorbed e) none of these The correct combination of coefficients when the following reaction is balanced are: Fe_2O_3(s) + CO(g) rightarrow Fe(s) + CO_2(g) a) 1, 2, 1, 3; b) 2, 2, 3, 1; c) 1, 3, 2, 3; d) 1, 2, 4, 5; e) none of these Which of the following are 'trace' elements (elements essential for healthy growth): i) Pb ii) Ag iii) Cu iv) Co v) Ti vi) Si vii)Zn viii) Hg (a) i), ii) and iii); (b) i), iii), iv) and vii); (c) v) and vi) only; (d) vi and vii only; (e) none of these? Compounds of 3 of the following elements are very poisonous. Which ones?

Explanation / Answer

12. Using,

V2 = V1.T2/T1

V2 is the new volume at T2 = T1

So,

V2 = 15 ml x 25 oC/50 oC = 30 ml

e) none of these

13. When an electron is moved from ground state to excited state,

d) energy is absorbed

14. The coefficients for the balanced equations would be,

c) 1,3,2,3

15. Trace essential elements are,

iv) Co

16. Essential elements needed for growth

b) i), iii), vi) and vii)

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