Question

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Question 21 1 pts A kilogram block of iron at 40 °C is placed into a kilogram of water at 20°C. The final temperature of the two becomes O more than 30 °C. O at or about 30 °C. o less than 30 °C. Question 22 1 pts At the same temperature, which move with greater speed in air? Heavier molecules Very light molecules. O All will have equal average speeds.

Answer 1

21) energy By the consensation of m, c, at - male di m=1kg = 4o J kg kl Ti = Gooc 1.8450x (313-5) = - 1x4200 (T-293) iron 313K 450 X 313 450 T = 4200 T - 4200 x 293 14 650T - 450x313 +4200 8293 water m2 = 1 kg C2 = 4200 JKg Ky Tz ²20°c = 293K T= 294.94 K T= 21,93 = 22°C Anfo less than 306 22 n.ms averase & velocity of Particle (gas) Cans = 1 3RT Care = SRT o Marimun cm= √281 velocity of sey Perficko at In all cases Ans: very light moleculs 23 Idea ges law PV = nRT For constant pressme T ¥ = constant so, it &T * T increase v cilso increase And: warnes 24 Anso Faster